WO2022030362A1 - Load control device - Google Patents

Load control device Download PDF

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Publication number
WO2022030362A1
WO2022030362A1 PCT/JP2021/028173 JP2021028173W WO2022030362A1 WO 2022030362 A1 WO2022030362 A1 WO 2022030362A1 JP 2021028173 W JP2021028173 W JP 2021028173W WO 2022030362 A1 WO2022030362 A1 WO 2022030362A1
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WO
WIPO (PCT)
Prior art keywords
switch
state
load
control device
control unit
Prior art date
Application number
PCT/JP2021/028173
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French (fr)
Japanese (ja)
Inventor
賢吾 宮本
Original Assignee
パナソニックＩｐマネジメント株式会社
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Publication of WO2022030362A1 publication Critical patent/WO2022030362A1/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/31—Phase-control circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • This disclosure relates to a load control device. More specifically, the present disclosure relates to a load control device that controls power supply to a load.
  • Patent Document 1 discloses a dimming device including a switch unit connected in series with a load to an AC power source and a control unit.
  • the control unit controls the phase of the AC voltage supplied to the load by controlling the on / off of the switch unit.
  • the switch unit is turned on at the time of zero crossing of the AC voltage, and the switch unit is turned off in the middle of every half cycle of the AC voltage to cut off the power supply to the load, so-called anti-phase control. Is going.
  • An object of the present disclosure is to provide a low-loss load control device capable of reducing noise.
  • the load control device of one aspect of the present disclosure includes a pair of connection terminals, a first switch, a capacitive element, a second switch, and a control unit.
  • a series circuit of an AC power supply and a load is connected to the pair of connection terminals.
  • the first switch is connected between the pair of connection terminals and is in an off state in which the supply of power from the AC power supply to the load is cut off, and an on state in which power is supplied from the AC power supply to the load. Can be switched to either.
  • the second switch is inserted in the current path.
  • the current path is a path through which a current flows from the AC power supply to the capacitive element via at least one of the pair of connection terminals.
  • the control unit controls the first switch to be in the ON state during the conduction period determined according to the power supplied to the load in each half cycle of the AC voltage of the AC power supply, and during a cutoff period other than the conduction period.
  • the first switch is controlled to be in the off state.
  • the control unit controls the second switch to be in the on state at the switching timing at which the first switch is switched on / off in the middle of each half cycle of the AC voltage.
  • FIG. 1 is a schematic circuit diagram of the load control device according to the first embodiment.
  • FIG. 2 is a timing chart showing the operation of the load control device as described above.
  • FIG. 3 is a circuit diagram showing a schematic configuration of the load control device according to the first modification of the first embodiment.
  • FIG. 4 is a schematic circuit diagram of the load control device according to the second embodiment.
  • the load control device 1 includes a pair of connection terminals TA1 and TA2, a first switch SW1, a capacitance element 12, a second switch SW2, and a control unit 11. Be prepared.
  • a series circuit of the AC power supply 2 and the load 3 is connected to the pair of connection terminals TA1 and TA2.
  • the first switch SW1 is connected between the pair of connection terminals TA1 and TA2.
  • the first switch SW1 is switched to either an off state in which the supply of power from the AC power supply 2 to the load 3 is cut off, or an on state in which power is supplied from the AC power supply 2 to the load 3.
  • the second switch SW2 is inserted into the current paths RT1 and RT2.
  • the current paths RT1 and RT2 are paths in which a current flows from the AC power supply 2 to the capacitive element 12 via at least one of the pair of connection terminals TA1 and TA2.
  • the control unit 11 controls the first switch SW1 to be in the ON state during the conduction period determined according to the power supplied to the load 3 in each half cycle of the AC voltage Vac of the AC power supply 2, and during the interruption period other than the conduction period.
  • the first switch SW1 is controlled to the off state.
  • the control unit 11 controls the second switch SW2 to be in the on state at the switching timing in which the first switch SW1 is switched on / off in the middle of each half cycle of the AC voltage Vac.
  • the first switch SW1 is realized by, for example, a semiconductor switch such as a transistor or a bidirectional thyristor.
  • the load control device 1 is a so-called electronic switch that electronically switches between conduction / non-conduction between the AC power supply 2 and the load 3 by electronically controlling the first switch SW1.
  • the load control device 1 includes a pair of connection terminals TA1 and TA2, and the first switch SW1 is electrically connected between the pair of connection terminals TA1 and TA2.
  • the connection terminal TA1 and the connection terminal TA2 are electrically connected via the first switch SW1.
  • One connection terminal TA1 is connected to the AC power supply 2, and the other connection terminal TA2 is connected to the load 3, so that the first switch SW1 is connected between the AC power supply 2 and the load 3.
  • the second switch SW2 is realized by, for example, a semiconductor switch such as a transistor or a bidirectional thyristor.
  • the second switch SW2 is inserted in the above current paths RT1 and RT2.
  • the load control device 1 electronically controls a state in which a current flows through the capacitance element 12 via the current paths RT1 and RT2 and a state in which the current paths RT1 and RT2 are cut off. It is a so-called electronic switch that switches to.
  • the second switch SW2 is controlled to the ON state, a current flows through the capacitance element 12 via the current paths RT1 and RT2, and when the second switch SW2 is controlled to the OFF state, a current flows through the capacitance element 12. Routes RT1 and RT2 are blocked.
  • the capacitance element 12 is an element capable of charging and discharging, and is, for example, a capacitor in this embodiment.
  • the capacitive element 12 is not limited to a capacitor, and may be an electric double layer capacitor, a secondary battery, or the like.
  • the control unit 11 Since the control unit 11 controls the first switch SW1 to be in the ON state during the conduction period determined according to the power supply to the load 3 in each half cycle of the AC voltage Vac, the control unit 11 applies the supply power according to the conduction period to the load 3. Can be supplied to.
  • the control unit 11 applies the supply power according to the conduction period to the load 3. Can be supplied to.
  • the circuit to which the first switch SW1 is connected AC power supply 2 and load 3 and the load control device.
  • a counter electromotive voltage may be generated due to the inductance of the electric circuit or the like connecting to 1 (hereinafter referred to as the inductance of the system) or the like.
  • the capacitive element 12 absorbs the counter electromotive voltage generated by switching the first switch SW1 on / off. This makes it possible to reduce the noise generated by the load control device 1. Therefore, in the load control device 1 of the present embodiment, it is not necessary to reduce the turn-off speed or the turn-on speed of the first switch SW1 in order to reduce noise, and the loss in the first switch SW1 is reduced and the first switch SW1 is first. The heat generation of the switch SW1 can be suppressed. Further, when the second switch SW2 is turned off, the current paths RT1 and RT2 in which the current flows from the AC power supply 2 to the capacitive element 12 are cut off, so that it is possible to suppress the flow of unnecessary current to the load 3.
  • the load control device 1 is fixed to an object to be mounted on the building.
  • the "mounting object" referred to in the present disclosure is an object to which the load control device 1 is fixed, for example, a building such as a wall, a ceiling or a floor of a building, or a fixture such as a desk, a shelf, or a counter stand. Including fittings) etc.
  • the building in which the load control device 1 is installed is, for example, a residential facility such as a detached house or an apartment house, or a non-residential facility such as an office, a store, a school, a factory, a hospital, or a nursing facility.
  • the load control device 1 is an embedded wiring device that is attached to an object to be attached made of a wall of a house.
  • the AC power supply 2 is, for example, a single-phase 100 [V], 60 [Hz] commercial AC power supply (system power supply).
  • the load 3 includes, for example, a dimmable lighting load.
  • the load 3 is a lighting device (lighting fixture) including a light source including an LED (Light Emitting Diode) and a lighting circuit for lighting the light source.
  • the light source is turned on when the power is supplied from the AC power supply 2, and the light output changes according to the magnitude of the supplied power supplied from the AC power supply 2.
  • connection terminals TA1 and TA2 for connecting electric wires.
  • an electric wire routed in a wall (mounting object) is connected to the connection terminals TA1 and TA2. Then, it is electrically connected to the AC power supply 2 and the load 3 via the electric wire.
  • the electric wire may be directly connected to the AC power source 2 (system power source or the like), or may be indirectly connected to the AC power source 2 (system power source or the like) via a distribution board or the like.
  • terminals such as the connection terminals TA1 and TA2 referred to in the present disclosure do not have to be parts for connecting electric wires or the like, and are, for example, leads of electronic parts or a part of a conductor included in a circuit board. It may be.
  • the place where "greater than or equal to” is used in the comparison of the two values includes both the case where the two values are equal and the case where one of the two values exceeds the other.
  • the present invention is not limited to this, and “greater than or equal to” here may be synonymous with “greater than” including only the case where one of the two values exceeds the other. That is, whether or not the two values are equal can be arbitrarily changed depending on the setting of the reference value or the like, so there is no technical difference between "greater than or equal to” and "greater than”.
  • “less than” may be synonymous with “less than or equal to”.
  • the load control device 1 of the present embodiment includes the pair of connection terminals TA1 and TA2, the first switch SW1, the capacitive element 12, the second switch SW2, and the control unit 11. To prepare for. Further, the load control device 1 of the present embodiment includes zero cross (denoted as "ZC" in the figure) detection units 15 and 16, a first drive circuit 17, a second drive circuit 18, a power supply unit 19, and an operation reception. The unit 20 is further provided. The components of these load control devices 1 are housed in one housing.
  • Each of the pair of connection terminals TA1 and TA2 is a component to which electric wires are electrically and mechanically connected.
  • Each of the pair of connection terminals TA1 and TA2 is, for example, a wire insertion type so-called quick connection terminal to which an electric wire is connected by inserting an electric wire from a terminal hole.
  • the first switch SW1 is inserted between the AC power supply 2 and the load 3 to switch between the conduction state and the cutoff state between the AC power supply 2 and the load 3.
  • insertion as used in the present disclosure means insertion between two electrically connected parties, and the first switch SW1 is a circuit composed of an AC power supply 2 and a load 3 and has an AC power supply 2 and a load. It will be electrically connected to 3.
  • the load 3 is electrically connected to the AC power supply 2 via the first switch SW1.
  • the first switch SW1 has two MOSFETs (Metal-Oxide-Semiconductor Field Effect Transistor) Q11 and Q12 electrically connected in series between the pair of connection terminals TA1 and TA2. ing.
  • MOSFETs Metal-Oxide-Semiconductor Field Effect Transistor
  • Each of these two MOSFETs Q11 and Q12 is an enhanced n-channel MOSFET.
  • the two MOSFETs Q11 and Q12 switch between conduction and cutoff for bidirectional current by connecting the source terminals to each other, that is, by connecting them in so-called anti-series.
  • the gate terminals of the MOSFETs Q11 and Q12 are electrically connected to the first drive circuit 17.
  • the first drive circuit 17 outputs the control signals Sa1 and Sa2 to the gate terminals of the MOSFETs Q11 and Q12 to drive the MOSFETs Q11 and Q12.
  • the first switch SW1 includes an on state and an off state as its operating state.
  • the on state includes a state in which the AC voltage Vac is electrically connected during the conduction period determined by the control unit 11, that is, a state in which the AC voltage is intermittently conducted in each half cycle. That is, in the present embodiment, the on state of the first switch SW1 is a state in which power is supplied from the AC power supply 2 to the load 3, and the off state of the first switch SW1 is a load from the AC power supply 2. The power supply to 3 is cut off.
  • the first switch SW1 is in a non-conducting state (off state), and an AC voltage Vac is applied from the AC power supply 2 between both ends of the first switch SW1. That is, when the first switch SW1 is in the off state, the voltage applied between both ends of the first switch SW1 (hereinafter, also referred to as “switch-to-switch voltage”) is substantially equal to the AC voltage Vac from the AC power supply 2. .. Further, in the following, the polarity of the voltage between switches at which the connection terminal TA1 has a high potential is referred to as “positive electrode property”, and the polarity of the voltage between switches at which the connection terminal TA2 has a high potential is referred to as “negative electrode property”.
  • the zero-cross detection units 15 and 16 are configured to detect the zero-cross point of the switch-to-switch voltage by detecting the magnitude of the switch-to-switch voltage.
  • the zero cross detection unit 15 is electrically connected to the connection terminal TA1.
  • the zero-cross detection unit 15 switches the voltage between switches from negative to positive by comparing the absolute value of the voltage between the connection terminals TA1-ground (reference potential point) with the reference value (for example, 10 [V]). Detects the zero crossing point at the time. That is, when the zero-cross detection unit 15 detects that the positive inter-switch voltage has shifted from a state below the reference value to a state above the reference value, it determines that it is a zero-cross point.
  • the zero cross detection unit 16 is electrically connected to the connection terminal TA2.
  • the zero-cross detection unit 16 compares the absolute value of the voltage between the terminals TA2-ground (reference potential point) with the reference value (for example, 10 [V]) when the voltage between switches switches from positive to negative. Detects the zero crossing point of. That is, when the zero cross detection unit 16 detects that the negative electrode inter-switch voltage has shifted from a state below the reference value to a state above the reference value, it determines that the zero cross point is reached.
  • the detection timing of the zero cross point detected by the zero cross detection units 15 and 16 is slightly delayed from the zero cross point (0 [V]) in the strict sense.
  • the power supply unit 19 generates electric power for operating a circuit such as the control unit 11 from the voltage applied to both ends of the first switch SW1.
  • the power supply unit 19 is electrically connected to the connection terminal TA1 via the diode D1 and electrically connected to the connection terminal TA2 via the diode D2.
  • the rectifier circuit DB1 is composed of the diodes D1 and D2 and the body diodes D11 and D12 of the MOSFETs Q11 and Q12, and the DC voltage after the AC voltage Vac from the AC power supply 2 is full-wave rectified by the rectifier circuit DB1. Is input to the power supply unit 19.
  • the power supply unit 19 includes a voltage conversion circuit such as a series regulator, a step-down chopper circuit, a buck-boost chopper circuit, or a step-up chopper circuit, and controls a constant voltage DC voltage by smoothing the output voltage from the rectifier circuit DB1. It is supplied to the circuit of the unit 11 and the like.
  • a voltage conversion circuit such as a series regulator, a step-down chopper circuit, a buck-boost chopper circuit, or a step-up chopper circuit, and controls a constant voltage DC voltage by smoothing the output voltage from the rectifier circuit DB1. It is supplied to the circuit of the unit 11 and the like.
  • the capacitive element 12 and the second switch SW2 are connected in series between the connection terminal TA1 and the connection terminal TA2.
  • a series circuit of the second switch SW2 and the capacitive element 12 is connected in parallel with the first switch SW1.
  • the capacitive element 12 is connected between the connection terminal TA1 and the second switch SW2.
  • the capacitance element 12 is, for example, one capacitor, but may be a plurality of capacitors connected in series or in parallel.
  • the second switch SW2 has two MOSFETs Q21 and Q22 electrically connected in series between the capacitive element 12 and the connection terminal TA2.
  • Each of these two MOSFETs Q21 and Q22 is an enhanced n-channel MOSFET.
  • the two MOSFETs Q21 and Q22 switch between conduction and cutoff for bidirectional current by connecting the source terminals to each other, that is, by connecting them in so-called anti-series.
  • the gate terminals of the MOSFETs Q21 and Q22 are electrically connected to the second drive circuit 18.
  • the second drive circuit 18 When the control signal from the control unit 11 is input, the second drive circuit 18 outputs the control signals Sb1 and Sb2 to the gate terminals of the MOSFETs Q21 and Q22 to drive the MOSFETs Q21 and Q22.
  • the operation reception unit 20 is, for example, a touch panel having a display function and a touch sensor function. This type of touch panel functions as a user interface.
  • the touch panel for example, presents information to a person by displaying information such as the operation status of the load control device 1, or receives an operation signal of the person to change the operation of the load control device 1 and outputs an operation signal to the control unit 11. It is possible to output to.
  • the operation receiving unit 20 outputs an operation signal to the control unit 11 in response to, for example, an operation of switching the on / off of the load 3 or an operation of switching the dimming level of the load 3.
  • the control unit 11 controls the first switch SW1 based on the operation signal input from the operation reception unit 20.
  • the operation receiving unit 20 is not limited to the one having a touch panel, and may be provided with a mechanical switch for receiving a human operation, a volume with a switch, or the like.
  • the operation reception unit 20 may receive a control command from a transmitter that transmits a radio signal including a control command of the load 3 in response to a human operation, and output this control command to the control unit 11 as an operation signal.
  • This type of wireless communication includes, for example, wireless communication conforming to communication standards such as a specified low power wireless station (a wireless station that does not require a license), Wi-Fi (registered trademark), or Bluetooth (registered trademark) in the 920 MHz band. Is.
  • the operation reception unit 20 having a wireless communication unit can receive wireless communication from the transmitter by performing wireless communication with the transmitter, and the control unit 11 is the first switch based on the wireless signal from the transmitter. It becomes possible to control SW1.
  • the control unit 11 includes, for example, a microcontroller having one or more processors and one or more memories as a main configuration.
  • the microcontroller realizes the function as the control unit 11 by executing the program recorded in one or more memories by one or more processors.
  • the program may be pre-recorded in memory, may be recorded and provided on a non-temporary recording medium such as a memory card, or may be provided through a telecommunication line.
  • the above program is a program for making one or more processors function as the control unit 11.
  • the control unit 11 controls at least the first switch SW1 and the second switch SW2 on / off. Specifically, as shown in FIG. 2, the control unit 11 acquires the detection signals ZC1 and ZC2 representing the detection results from the zero cross detection units 15 and 16, respectively. Further, the control unit 11 acquires an operation signal output by the operation reception unit 20 in response to a human operation. Further, the control unit 11 outputs a control signal for controlling the first switch SW1 to the first drive circuit 17, and outputs a control signal for controlling the second switch SW2 to the second drive circuit 18.
  • control unit 11 adjusts the supply power (that is, the amount of power) supplied from the AC power supply 2 to the load 3 per unit time by phase control or PWM (Pulse Width Modulation) control, so that the first switch SW1 May be controlled (hereinafter, also referred to as “load control”).
  • the control unit 11 controls the first switch SW1 to be in the on state until the conduction period elapses from the start point of the half cycle of the AC voltage Vac, and controls the first switch SW1 to the off state after the continuation period elapses. Performs phase control (so-called anti-phase control).
  • the first switch SW1 switches from the off state to the on state at the start point of the half cycle of the AC voltage Vac, but is not limited to the one that switches from the off state to the on state at the zero cross point of the AC voltage Vac. It may be the one that switches from the off state to the on state at the time of detection.
  • control unit 11 controls the second switch SW2 to the on state at the switching timing in which the on / off of the first switch SW1 is switched in the middle of each half cycle of the AC voltage Vac.
  • control unit 11 controls the second switch SW2 to the on state at the switching timing when the first switch SW1 switches from on to off in the middle of each half cycle of the AC voltage Vac.
  • the second switch SW2 is turned on, the current path RT1 or RT2 in which a current flows from the AC power supply 2 to the capacitive element 12 is formed.
  • the capacitive element 12 is connected in parallel with the first switch SW1 between the pair of connection terminals TA1 and TA2, so that the counter electromotive voltage generated when the first switch SW1 is turned off is generated by the capacitive element 12. It can be absorbed and the noise superimposed on the AC voltage Vac can be reduced.
  • the load control device 1 Immediately after the load control device 1 is started, that is, immediately after the power supply is started, the first switch SW1 and the second switch SW2 are turned off, and the DC voltage after full-wave rectification of the AC voltage Vac by the rectifier circuit DB1 is obtained. It is supplied to the power supply unit 19.
  • the power supply unit 19 converts the DC voltage input from the rectifier circuit DB 1 into a DC voltage having a predetermined voltage value and supplies the DC voltage to the control unit 11, and the control unit 11 starts operation.
  • the control unit 11 controls the on / off of the first switch SW1 according to the operation signal input from the operation reception unit 20.
  • the control unit 11 controls the first drive circuit 17 to control the first switch SW1 (that is, MOSFETs Q11 and Q12) to the off state, and AC.
  • the power supply from the power supply 2 to the load 3 is cut off.
  • the control unit 11 controls the first switch SW1 to the off state
  • the control unit 11 controls the second drive circuit 18 to control the second switch SW2 (that is, MOSFETs Q21 and Q22) to the off state.
  • FIG. 2 shows the AC voltage Vac, the load voltage V1 applied to the load 3, the detection signals ZC1 and ZC2 of the zero cross detection units 15 and 16, and the control signals Sa1 and Sa2 and MOSFETQ21 input to the gate terminals of the MOSFETs Q11 and Q12.
  • the control signals Sb1 and Sb2, which are input to the gate terminal of Q22, are shown.
  • the detection signal ZC1 is a detection signal by the zero cross detection unit
  • the detection signal ZC2 is a detection signal by the zero cross detection unit 16.
  • the detection signals ZC1 and ZC2 are generated when the detection signals ZC1 and ZC2 change from the “H” level to the “L” level. That is, the detection signals ZC1 and ZC2 are signals that change from the "H” level to the “L” level when the zero cross point is detected.
  • the load control device 1 detects the zero cross point of the AC voltage Vac, which is the reference of the phase control, by the zero cross detection unit 15.
  • the zero cross detection unit 15 outputs the detection signal ZC1.
  • the time point at which the detection signal ZC1 is generated is defined as the first time point t1
  • the period from the start point (zero cross point) t0 of the half cycle to the first time point t1 is defined as the first time period T1.
  • the control unit 11 outputs a control signal for turning off the first switch SW1 to the first drive circuit 17.
  • the first drive circuit 17 outputs an "OFF" signal as control signals Sa1 and Sa2 in response to this control signal.
  • both of the two MOSFETs Q11 and Q12 are turned off, and the first switch SW1 is turned off.
  • the control unit 11 outputs a control signal to the first drive circuit 17, and causes the first drive circuit 17 to output an “ON” signal as the control signals Sa1 and Sa2.
  • the first switch SW1 is switched from the off state to the on state at the first time point t1, and power is supplied from the AC power supply 2 to the load 3.
  • the control unit 11 outputs a control signal for turning off the MOSFET Q11 to the first drive circuit 17 at the third time point t3 where the conduction period (second period) T2 has elapsed from the first time point t1.
  • the first drive circuit 17 outputs an "OFF" signal as a control signal Sa1 while outputting an "ON” signal as a control signal Sa2 in response to this control signal.
  • the control unit 11 determines the length of the conduction period T2 according to the dimming level (that is, the power supplied to the load 3) input from the operation reception unit 20.
  • the first switch SW1 continues to be on, and power is supplied from the AC power supply 2 to the load 3.
  • the first switch SW1 is switched from the on state to the off state, and the power supply from the AC power supply 2 to the load 3 is cut off.
  • the control unit 11 outputs a control signal for turning on the second switch SW2 to the second drive circuit 18.
  • the second drive circuit 18 outputs an "ON" signal as control signals Sb1 and Sb2 in response to this control signal.
  • both of the two MOSFETs Q21 and Q22 are turned on, and the second switch SW2 is turned on. That is, the control unit 11 controls the second switch SW2 to the on state at the switching timing (third time point t3) for switching the first switch SW1 from the on state to the off state, and the second switch SW2 is in the on state. In this state, the first switch SW1 is switched from the on state to the off state.
  • the counter electromotive voltage generated due to the inductance of the system at the switching timing (third time point t3) can be absorbed by the capacitive element 12. Further, by absorbing the counter electromotive voltage by the capacitive element 12, high-speed switching of the first switch SW1 becomes possible, and the switching loss in the first switch SW1 can be reduced.
  • the control unit 11 sends a control signal for turning on only the MOSFET Q22 at the fourth time point t4 where a predetermined surge absorption period has elapsed from the third time point t3.
  • 2 Output to the drive circuit 18.
  • the second drive circuit 18 outputs an "OFF" signal as a control signal Sb1 while outputting an "ON” signal as a control signal Sb2 in response to this control signal.
  • the MOSFET Q21 is controlled to the off state and the second switch SW2 is turned off from the third time point t3 until the end of the positive half cycle of the AC voltage Vac.
  • the control unit 11 switches the second switch SW2 from the on state to the off state when a predetermined time (surge absorption period) elapses from the switching timing (third time point t3).
  • the surge absorption period is preferably set to a period longer than the period in which the counter electromotive voltage is expected to be generated due to the inductance of the system or the like at the switching timing (third time point t3). Therefore, after the surge absorption period has elapsed, the current path RT1 in which the current flows from the AC power supply 2 to the capacitance element 12 is cut off to suppress the current flowing through the capacitance element 12 when the first switch SW1 is turned off.
  • the dimming characteristic of the load 3 can be improved.
  • the electric charge stored in the capacitive element 12 is alternating current via the body diode D21 of the MOSFET Q21 and the MOSFET Q22. It is discharged to the power supply 2.
  • the control unit 11 outputs a control signal for turning off the MOSFET Q22 to the second drive circuit 18 at the fifth time point t5 when a predetermined discharge period T10 has elapsed from the third time point t3.
  • the second drive circuit 18 outputs an “OFF” signal as control signals Sb1 and Sb2 in response to this control signal, and turns off the MOSFETs Q21 and Q22 together to cut off the discharge path from the capacitive element 12.
  • the discharge period T10 is preferably set to a period longer than the time required for discharging the electric charge stored in the capacitive element 12.
  • control unit 11 controls to turn off the MOSFET Q12 at the sixth time point t6, which is a certain time (for example, 300 [ ⁇ s]) before the end point (zero cross point) t7 of the positive electrode property of the AC voltage Vac.
  • the signal is output to the first drive circuit 17.
  • the first drive circuit 17 outputs an "OFF" signal as control signals Sa1 and Sa2 in response to this control signal.
  • the period from the third time point t3 to the sixth time point t6 is referred to as the third time point T3
  • the period from the sixth time point t6 to the end point (zero cross point) t7 of the positive half cycle is the fourth period T4. That is.
  • both of the two MOSFETs Q11 and Q12 are turned off, and the first switch SW1 is turned off.
  • the operation of the load control device 1 in the half cycle in which the AC voltage Vac is the negative electrode is basically the same as the operation in the half cycle in which the AC voltage Vac is the positive electrode.
  • the zero cross detection unit 16 When the AC voltage Vac reaches the specified value "-Vzc" of the negative electrode property in the negative electrode property half cycle, the zero cross detection unit 16 outputs the detection signal ZC2.
  • the period from the start point t0 (t7) of the negative electrode half cycle to the first time point t1 which is the time point of generation of the detection signal ZC2 is defined as the first period T1.
  • the third time point t3 is the time point when the conduction period having a length corresponding to the dimming level has elapsed from the first time point t1, and the sixth time point t6 is more than the end point t7 (t0) of the negative half cycle. This is the time before a certain period of time (for example, 300 [ ⁇ s]).
  • the second switch SW2 is turned on at the second time point t2 before the switching timing (third time point t3) in which the first switch SW1 is switched from the on state to the off state, and the AC power supply 2 is used.
  • a current path RT2 through which a current flows is formed in the capacitive element 12. Therefore, the capacitive element 12 can absorb the counter electromotive voltage generated due to the inductance of the system or the like at the switching timing (third time point t3).
  • the second switch SW2 is in the off state during the period from the start point of the negative half cycle of the AC voltage Vac to the second time point t2 and the period from the fourth time point t4 to the end point t7 of the negative electrode half cycle.
  • the current path from the AC power supply 2 to the capacitive element 12 is cut off. Therefore, as compared with the case where the second switch SW2 is continuously turned on in the negative electrode half cycle, the current flowing through the capacitance element 12 when the first switch SW1 is turned off can be suppressed, and the load can be suppressed. It is possible to suppress the deterioration of the dimming performance of 3.
  • the load control device 1 of the present embodiment alternately repeats the positive half-cycle operation and the negative half-cycle operation described above every half cycle of the AC voltage Vac to adjust the dimming of the load 3. conduct. If the specified value "Vzc" for the positive electrode property and the specified value "-Vzc” for the negative electrode property are fixed values, the time from the start point t0 of the half cycle to the first time point (time point when the detection signal ZC1 or ZC2 is generated) t1. Is a time of approximately fixed length.
  • the length will change.
  • the conduction period is a variable length time, and the phase of the switching timing (third time point t3) with respect to the AC voltage Vac changes according to the dimming level. That is, when the optical output of the load 3 is reduced, the conduction period is short, and when the optical output of the load 3 is increased, the conduction period is long. Therefore, the load control device 1 can change the magnitude of the light output of the load 3 according to the dimming level received by the operation reception unit 20.
  • Modification Example 1 is only one of various embodiments of the present disclosure.
  • the first embodiment can be changed in various ways depending on the design and the like as long as the object of the present disclosure can be achieved.
  • the specific circuit shown in FIG. 1 is only an example of the load control device 1 of the present disclosure, and various changes can be made depending on the design and the like.
  • Each figure described in the present disclosure is a schematic view, and the ratio of the size and the thickness of each component in each figure does not necessarily reflect the actual dimensional ratio.
  • the function equivalent to that of the control unit 11 of the load control device 1 according to the first embodiment may be embodied by a control method, a (computer) program, a non-temporary recording medium on which the program is recorded, or the like.
  • FIG. 3 shows a schematic circuit diagram of the load control device 1 according to the first modification of the first embodiment.
  • the connection point P2 of the MOSFETs Q21 and Q22 is connected to the reference potential of the power supply unit 19, and the capacitive element 12 includes the first capacitive element 121 and the second capacitive element 122. It differs from the above-mentioned first embodiment.
  • the first capacitive element 121 is connected between the connection terminal TA1 and the MOSFET Q21, and the second capacitive element 122 is connected between the connection terminal TA2 and the MOSFET Q22.
  • connection point P1 of the MOSFETs Q11 and Q12 and the connection point P2 of the MOSFETs Q21 and Q22 are electrically connected.
  • the same configurations as those in the first embodiment will be designated by a common reference numeral and description thereof will be omitted as appropriate.
  • the control unit 11 controls the first switch SW1 in anti-phase control, and controls the second switch SW2 to the on state at the switching timing when the first switch SW1 switches from the on state to the off state in each half cycle of the AC voltage Vac. is doing.
  • the control unit 11 controls both the MOSFETs Q21 and Q22 to the off state, and the electric charge accumulated in the first capacitance element 121 or the second capacitance element 122 is the MOSFETs Q21 and Q22. It is discharged through the body diodes D21 and D22 of the above and through the reference potential of the power supply unit 19.
  • the first capacitance element 121 and the second capacitance element 122 are composed of a capacitor, but an electric double layer capacitor, a secondary battery, or the like may be used. Further, each of the first capacitor element 121 and the second capacitor element 122 is not limited to one composed of one capacitor, and may be composed of a plurality of capacitors connected in series or in parallel.
  • the load control device 1 in the present disclosure includes a computer system in the control unit 11 and the like.
  • the computer system mainly consists of a processor and a memory as hardware.
  • the program may be pre-recorded in the memory of the computer system, may be provided through a telecommunications line, and may be recorded on a non-temporary recording medium such as a memory card, optical disk, hard disk drive, etc. that can be read by the computer system. May be provided.
  • the processor of a computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large scale integrated circuit (LSI).
  • the integrated circuit such as IC or LSI referred to here has a different name depending on the degree of integration, and includes an integrated circuit called a system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration).
  • an FPGA Field-Programmable Gate Array
  • a plurality of electronic circuits may be integrated on one chip, or may be distributed on a plurality of chips.
  • a plurality of chips may be integrated in one device, or may be distributed in a plurality of devices.
  • the computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, the microprocessor is also composed of one or a plurality of electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.
  • the load control device 1 it is not an essential configuration for the load control device 1 that at least a part of the functions of the load control device 1 are integrated in one housing, and the components of the load control device 1 are integrated in a plurality of housings. It may be provided in a distributed manner.
  • the touch panel included in the operation reception unit 20 may be provided in a housing different from the control unit 11.
  • at least a part of the functions of the control unit 11 and the like may be realized by, for example, a server or a cloud (cloud computing).
  • the control unit 11 controls the second switch SW2 from the off state to the on state before the switching timing (third time point t3), but at the above switching timing, the second switch SW2 is turned on. It may be controlled from the off state to the on state. That is, the control unit 11 may control the second switch SW2 from the off state to the on state at the same timing as controlling the first switch SW1 from the off state to the on state, and when the first switch SW1 is off.
  • the generated counter electromotive voltage can be suppressed by the capacitive element 12.
  • the control unit 11 controls the first switch SW1 in the opposite phase, but the first switch SW1 may be controlled in the positive phase. That is, even if the control unit 11 controls the first switch SW1 to the off state from the start point of the half cycle of the AC voltage Vac until the cutoff period elapses, and controls the first switch SW1 to the on state after the cutoff period elapses. good. Even in the positive phase control, since the control unit 11 controls the second switch SW2 to be in the ON state at the switching timing of the first switch SW1, the counter electromotive voltage generated at the switching timing can be reduced. In the case of positive phase control, the control unit 11 may control the second switch SW2 to the on state at the switching timing when the first switch SW1 switches from off to on in the middle of each half cycle of the AC voltage Vac.
  • the AC power supply 2 is a single-phase 100 [V], 60 [Hz] commercial power supply, but may be a single-phase 100 [V], 50 [Hz] commercial power supply. Further, the voltage value of the AC power supply 2 is not limited to 100 [V].
  • the load control device 1 is a one-sided switch, but may have another configuration.
  • the load control device 1 may be a so-called three-way switch capable of connecting three wires.
  • the load control device 1 may be a so-called four-way switch capable of connecting four wires.
  • the load control device 1 constitutes a three-way switch, by combining the two load control devices 1, the energization state of the load 3 can be set at two places, for example, the upper floor part and the lower floor part of the stairs in the building. It is possible to switch.
  • the load control device 1 is a two-wire switch to which two electric wires of L phase and N phase are connected, but the load control device 1 is an L phase, a load, and a power supply. And may be a three-wire switch to which three electric wires are connected to the N phase common to the load.
  • the zero cross detection unit 15 is configured to detect the zero cross when the voltage between the switches switches from the negative electrode property to the positive electrode property when the voltage between the connection terminals TA1-ground becomes equal to or higher than the reference value. May be. That is, the zero cross detection unit 15 may be configured to detect the zero cross when the voltage between the switches switches from the positive electrode property to the negative electrode property when the voltage between the connection terminals TA1-ground becomes less than the reference value. Similarly, the zero-cross detection unit 16 is configured to detect zero-cross when the switch-to-switch voltage switches from positive to negative when the voltage between terminals TA2-ground becomes equal to or higher than the reference value, but the opposite is true. May be good. That is, the zero cross detection unit 16 may be configured to detect the zero cross when the voltage between the switches switches from the negative electrode property to the positive electrode property when the voltage between the terminals TA2-ground becomes less than the reference value.
  • the load 3 is not limited to a lighting device including a light source made of an LED, and may be a lighting device including a light source other than the LED. Further, the load 3 is not limited to the lighting device, and may be, for example, a device (including a device, a system, and a device) such as a ventilation fan, a display device, an electric shutter, an air conditioning device, or a security device. Further, the load 3 is not limited to one device, and may be a plurality of devices electrically connected in series or in parallel.
  • the load control device 1 may further include an operation terminal for connecting a slave unit.
  • the slave unit is provided with a contact portion such as a push button switch, and on / off of the contact portion is detected by the load control device 1.
  • the load control device 1 controls the first switch SW1 so as to switch the operating state of the first switch SW1 according to the operation of the slave unit (on / off of the contact portion). That is, in the slave unit, for example, the load control device 1 operates so that the on state and the off state of the first switch SW1 are switched each time the push button switch is pressed and the contact portion is turned on.
  • the control of the first switch SW1 may be performed not only according to the output of the operation receiving unit 20 but also according to the operation of the slave unit. Therefore, the load control device 1 and the slave unit are installed separately in, for example, the upper floor portion and the lower floor portion of the stairs in the building, so that the energization state of the load 3 is switched at the two locations. It is possible.
  • the load control device 1 may include a sensor circuit, a timer circuit, or the like in addition to or in place of the operation reception unit 20.
  • the sensor circuit includes a motion sensor and / or a brightness sensor that detects whether or not a person is present.
  • the load control device 1 can control the first switch SW1 based on the outputs of these sensor circuits, timer circuits, and the like.
  • the first switch SW1 has two MOSFETs Q11 and Q12, but is not limited to the MOSFET and may be another semiconductor switch.
  • the first switch SW1 may be realized by a three-terminal bidirectional thyristor (triac), or has a double gate (dual gate) structure using a wide bandgap semiconductor material such as GaN (gallium nitride). It may be realized by using a semiconductor element.
  • a series circuit of the second switch SW21 and the capacitance element 12 is connected between the output terminals of the rectifier circuit DB1 according to the first embodiment. It is different from the load control device 1. That is, the load control device 1A of the second embodiment includes a rectifier circuit DB1 that rectifies the AC voltage Vac input via the pair of connection terminals TA1 and TA2. Then, a series circuit of the second switch SW21 and the capacitance element 12 is connected between the output terminals of the rectifier circuit DB1.
  • the same configurations as those in the first embodiment will be designated by a common reference numeral and description thereof will be omitted as appropriate.
  • the second switch SW21 is electrically connected to the connection terminal TA1 via the diode D1 and electrically connected to the connection terminal TA2 via the diode D2. That is, the second switch SW21 is inserted into the current path RT3 in which a current flows from the AC power supply 2 to the capacitance element 12 via the connection terminal TA1 or TA2.
  • the second switch SW21 is controlled to the ON state, a current flows from the AC power supply 2 to the capacitance element 12, and when the second switch SW21 is controlled to the OFF state, the current flows from the AC power supply 2 to the capacitance element 12. Is blocked.
  • the load control device 1A of the second embodiment further includes a series circuit of the resistor R1 (impedance element) and the third switch SW3 connected in parallel with the capacitance element 12. Then, the control unit 11 controls the third switch SW3 to the on state during the period for controlling the second switch SW21 to the off state. The control unit 11 controls the third switch SW3 to the off state during the period for controlling the second switch SW21 to the on state.
  • the third switch SW3 is, for example, a MOSFET, but may be realized by a semiconductor switch such as a transistor or a thyristor, or may be realized by a contact of a mechanical relay or the like.
  • the impedance element is realized by the resistor R1, but the impedance element is not limited to the control unit 11 and can be changed as appropriate.
  • the electric charge stored in the capacitive element 12 may be supplied to a power supply circuit such as a series regulator and used as electric power to be supplied to a circuit such as a control unit 11.
  • the first switch SW1 is controlled in anti-phase
  • the second switch SW21 is controlled to be in the on state at the switching timing for switching the first switch SW1 from the on state to the off state. ing.
  • the control unit 11 switches the second switch SW21 from the on state to the off state when a predetermined time has elapsed from the switching timing. Then, when the second switch SW21 is controlled to the off state, the control unit 11 controls the third switch SW3 to the on state, so that the electric charge stored in the capacitive element 12 can be discharged via the resistor R1. can.
  • the load control device (1,1A) of the first aspect includes a pair of connection terminals (TA1, TA2), a first switch (SW1), a capacitive element (12), and a second switch. (SW2, SW21) and a control unit (11) are provided.
  • a series circuit of the AC power supply (2) and the load (3) is connected to the pair of connection terminals (TA1, TA2).
  • the first switch (SW1) is connected between a pair of connection terminals (TA1 and TA2), and is in an off state in which power supply from the AC power supply (2) to the load (3) is cut off, and an AC power supply (2). ) To one of the on states that supply power to the load (3).
  • the second switch (SW2, SW21) is inserted into the current path (RT1 to RT3).
  • the current paths (RT1 to RT3) are paths through which a current flows from the AC power supply (2) to the capacitive element (12) via at least one of the pair of connection terminals (TA1 and TA2).
  • the control unit (11) turns on the first switch (SW1) in each half cycle of the AC voltage (Vac) of the AC power supply (2) during the conduction period determined according to the power supplied to the load (3). It is controlled and the first switch (SW1) is controlled to be in the off state during a cutoff period other than the conduction period.
  • the control unit (11) controls the second switch (SW2, SW21) to be in the ON state at the switching timing in which the first switch (SW1) is switched on / off in the middle of each half cycle of the AC voltage (Vac).
  • the series circuit of the second switch (SW2) and the capacitive element (12) is connected in parallel with the first switch (SW1). ..
  • the load control device (1A) of the third aspect further includes a rectifier circuit (DB1) for rectifying an AC voltage (Vac) input via a pair of connection terminals (TA1, TA2) in the first aspect. ..
  • DB1 rectifier circuit
  • a series circuit of the second switch (SW21) and the capacitive element (12) is connected between the output terminals of the rectifier circuit (DB1).
  • the load control device (1A) of the fourth aspect further includes a series circuit of the impedance element (R1) and the third switch (SW3) connected in parallel with the capacitive element (12). ..
  • the control unit (11) controls the third switch (SW3) to the on state during the period for controlling the second switch (SW21) to the off state.
  • the control unit (11) is used from the start point of the half cycle of the AC voltage (Vac) until the conduction period elapses.
  • the first switch (SW1) is controlled to be in the on state, and the first switch (SW1) is controlled to be in the off state after the conduction period has elapsed.
  • control unit (11) has a second switch (11) at the switching timing of switching the first switch (SW1) from the on state to the off state.
  • SW2, SW21) are controlled to be on.
  • control unit (11) has a second switch (SW1) at a switching timing of switching the first switch (SW1) from the on state to the off state.
  • SW2, SW21) is controlled from the off state to the on state.
  • the control unit (11) starts from the switching timing of switching the first switch (SW1) from the on state to the off state. After a lapse of a predetermined time, the second switch (SW2, SW21) is switched from the on state to the off state.
  • the control unit (11) is used from the start point of the half cycle of the AC voltage (Vac) until the cutoff period elapses.
  • the first switch (SW1) is controlled to be in the off state, and the first switch (SW1) is controlled to be in the on state after the cutoff period has elapsed.
  • the load (3) includes a dimmable lighting load.
  • various configurations (including modifications) of the load control device (1,1A) according to the first or second embodiment include a control method of the load control device (1,1A), a (computer) program, and the like.
  • it can be embodied in a non-temporary recording medium or the like on which the program is recorded.
  • the configurations according to the second to tenth aspects are not essential configurations for the load control device (1, 1A) and can be omitted as appropriate.
  • Load control device 2 AC power supply 3
  • Load 12 Capacitive element DB1 Rectifier circuit
  • R1 Impedance element RT1 to RT3 Current path

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The purpose of the present disclosure is to provide a low-loss load control device that can reduce noise. In the present invention, a first switch (SW1) is connected between a pair of connecting terminals (TA1, TA2), and switches to one of an off state in which the supply of electric power from an AC power source (2) to a load (3) is shut down and an on state in which electric power is supplied from the AC power source (2) to the load (3). A second switch (SW2) is inserted into current paths (RT1, RT2) through which current flows from the AC power source (2) to a capacitive element (12) via at least one of the pair of connecting terminals (TA1, TA2). In each half cycle of an AC voltage (Vac) of the AC power source (2), a control unit (11) controls the first switch (SW1) to the on state during a conduction period determined according to the electric power supplied to the load (3), and controls the first switch (SW1) to the off state during a shutdown period other than the conduction period. The control unit (11) controls the second switch (SW2) to the on state at a switching timing at which the first switch (SW1) is switched on/off partway through each half cycle of the AC voltage (Vac).

Description

負荷制御装置Load control device
　本開示は、負荷制御装置に関する。より詳細には、本開示は、負荷への電力供給を制御する負荷制御装置に関する。 This disclosure relates to a load control device. More specifically, the present disclosure relates to a load control device that controls power supply to a load.
　特許文献１は、交流電源に対して負荷と直列に接続されたスイッチ部と、制御部とを備える調光装置を開示する。制御部は、スイッチ部のオン／オフを制御することによって、負荷に供給する交流電圧を位相制御する。 Patent Document 1 discloses a dimming device including a switch unit connected in series with a load to an AC power source and a control unit. The control unit controls the phase of the AC voltage supplied to the load by controlling the on / off of the switch unit.
　特許文献１の調光装置では、交流電圧のゼロクロスの時点でスイッチ部をオンにし、交流電圧の毎半サイクルの期間途中でスイッチ部をオフにして負荷への給電を遮断するいわゆる逆位相制御を行っている。 In the dimmer of Patent Document 1, the switch unit is turned on at the time of zero crossing of the AC voltage, and the switch unit is turned off in the middle of every half cycle of the AC voltage to cut off the power supply to the load, so-called anti-phase control. Is going.
　上述の特許文献１において、スイッチ部をターンオフする場合に、交流電源及び負荷とスイッチ部との間を接続する電線などのインダクタンス（以下、系統のインダクタンスという）等に起因して逆起電圧が発生する可能性がある。スイッチ部のターンオフ速度を低速にするとターンオフ時に発生する逆起電圧を低減することが可能であるが、スイッチング損失が増加するという問題がある。 In the above-mentioned Patent Document 1, when the switch portion is turned off, a counter electromotive voltage is generated due to the inductance of the AC power supply and the electric wire connecting the load and the switch portion (hereinafter referred to as the system inductance). there's a possibility that. Although it is possible to reduce the counter electromotive voltage generated at the time of turn-off by reducing the turn-off speed of the switch unit, there is a problem that the switching loss increases.
特開２０１３－１４９４９８号公報Japanese Unexamined Patent Publication No. 2013-149948
　本開示の目的は、ノイズの低減が可能な低損失の負荷制御装置を提供することにある。 An object of the present disclosure is to provide a low-loss load control device capable of reducing noise.
　本開示の一態様の負荷制御装置は、一対の接続端子と、第１スイッチと、容量素子と、第２スイッチと、制御部と、を備える。前記一対の接続端子には、交流電源及び負荷の直列回路が接続される。前記第１スイッチは、前記一対の接続端子の間に接続され、前記交流電源から前記負荷への電力の供給を遮断するオフ状態、及び、前記交流電源から前記負荷へ電力の供給を行うオン状態のいずれかに切り替えられる。前記第２スイッチは電流経路に挿入される。前記電流経路は、前記交流電源から前記一対の接続端子のうちの少なくとも一方を介して前記容量素子に電流が流れる経路である。前記制御部は、前記交流電源の交流電圧の各半周期に、前記負荷への供給電力に応じて決定した導通期間に前記第１スイッチをオン状態に制御し、前記導通期間以外の遮断期間に前記第１スイッチをオフ状態に制御する。前記制御部は、前記交流電圧の各半周期の途中で前記第１スイッチのオン／オフが切り替わる切替タイミングにおいて前記第２スイッチをオン状態に制御する。 The load control device of one aspect of the present disclosure includes a pair of connection terminals, a first switch, a capacitive element, a second switch, and a control unit. A series circuit of an AC power supply and a load is connected to the pair of connection terminals. The first switch is connected between the pair of connection terminals and is in an off state in which the supply of power from the AC power supply to the load is cut off, and an on state in which power is supplied from the AC power supply to the load. Can be switched to either. The second switch is inserted in the current path. The current path is a path through which a current flows from the AC power supply to the capacitive element via at least one of the pair of connection terminals. The control unit controls the first switch to be in the ON state during the conduction period determined according to the power supplied to the load in each half cycle of the AC voltage of the AC power supply, and during a cutoff period other than the conduction period. The first switch is controlled to be in the off state. The control unit controls the second switch to be in the on state at the switching timing at which the first switch is switched on / off in the middle of each half cycle of the AC voltage.
図１は、実施形態１に係る負荷制御装置の概略的な回路図である。FIG. 1 is a schematic circuit diagram of the load control device according to the first embodiment. 図２は、同上の負荷制御装置の動作を示すタイミングチャートである。FIG. 2 is a timing chart showing the operation of the load control device as described above. 図３は、実施形態１の変形例１に係る負荷制御装置の概略構成を示す回路図である。FIG. 3 is a circuit diagram showing a schematic configuration of the load control device according to the first modification of the first embodiment. 図４は、実施形態２に係る負荷制御装置の概略的な回路図である。FIG. 4 is a schematic circuit diagram of the load control device according to the second embodiment.
　（実施形態１）
　（１）概要
　以下、実施形態１に係る負荷制御装置１の概要について、図１を参照して説明する。 (Embodiment 1)
(1) Overview Hereinafter, an outline of the load control device 1 according to the first embodiment will be described with reference to FIG.
　本実施形態に係る負荷制御装置１は、図１に示すように、一対の接続端子ＴＡ１，ＴＡ２と、第１スイッチＳＷ１と、容量素子１２と、第２スイッチＳＷ２と、制御部１１と、を備える。 As shown in FIG. 1, the load control device 1 according to the present embodiment includes a pair of connection terminals TA1 and TA2, a first switch SW1, a capacitance element 12, a second switch SW2, and a control unit 11. Be prepared.
　一対の接続端子ＴＡ１，ＴＡ２には、交流電源２及び負荷３の直列回路が接続される。 A series circuit of the AC power supply 2 and the load 3 is connected to the pair of connection terminals TA1 and TA2.
　第１スイッチＳＷ１は、一対の接続端子ＴＡ１，ＴＡ２の間に接続される。第１スイッチＳＷ１は、交流電源２から負荷３への電力の供給を遮断するオフ状態、及び、交流電源２から負荷３へ電力の供給を行うオン状態のいずれかに切り替えられる。 The first switch SW1 is connected between the pair of connection terminals TA1 and TA2. The first switch SW1 is switched to either an off state in which the supply of power from the AC power supply 2 to the load 3 is cut off, or an on state in which power is supplied from the AC power supply 2 to the load 3.
　第２スイッチＳＷ２は、電流経路ＲＴ１及びＲＴ２に挿入される。電流経路ＲＴ１及びＲＴ２は、交流電源２から一対の接続端子ＴＡ１，ＴＡ２のうちの少なくとも一方を介して容量素子１２に電流が流れる経路である。 The second switch SW2 is inserted into the current paths RT1 and RT2. The current paths RT1 and RT2 are paths in which a current flows from the AC power supply 2 to the capacitive element 12 via at least one of the pair of connection terminals TA1 and TA2.
　制御部１１は、交流電源２の交流電圧Ｖａｃの各半周期に、負荷３への供給電力に応じて決定した導通期間に第１スイッチＳＷ１をオン状態に制御し、導通期間以外の遮断期間に第１スイッチＳＷ１をオフ状態に制御する。制御部１１は、交流電圧Ｖａｃの各半周期の途中で第１スイッチＳＷ１のオン／オフが切り替わる切替タイミングにおいて第２スイッチＳＷ２をオン状態に制御する。 The control unit 11 controls the first switch SW1 to be in the ON state during the conduction period determined according to the power supplied to the load 3 in each half cycle of the AC voltage Vac of the AC power supply 2, and during the interruption period other than the conduction period. The first switch SW1 is controlled to the off state. The control unit 11 controls the second switch SW2 to be in the on state at the switching timing in which the first switch SW1 is switched on / off in the middle of each half cycle of the AC voltage Vac.
　ここにおいて、第１スイッチＳＷ１は、例えば、トランジスタ又は双方向サイリスタ等の半導体スイッチにて実現される。本実施形態では、負荷制御装置１は、第１スイッチＳＷ１を電子的に制御することにより、交流電源２と負荷３との間の導通／非導通を電子的に切り替える、いわゆる電子スイッチである。負荷制御装置１は一対の接続端子ＴＡ１，ＴＡ２を備えており、第１スイッチＳＷ１は、一対の接続端子ＴＡ１，ＴＡ２間に電気的に接続されている。言い換えれば、負荷制御装置１の内部において、接続端子ＴＡ１と接続端子ＴＡ２とは、第１スイッチＳＷ１を介して電気的に接続されている。一方の接続端子ＴＡ１が交流電源２に接続され、他方の接続端子ＴＡ２が負荷３に接続されることで、交流電源２と負荷３との間に第１スイッチＳＷ１が接続されている。 Here, the first switch SW1 is realized by, for example, a semiconductor switch such as a transistor or a bidirectional thyristor. In the present embodiment, the load control device 1 is a so-called electronic switch that electronically switches between conduction / non-conduction between the AC power supply 2 and the load 3 by electronically controlling the first switch SW1. The load control device 1 includes a pair of connection terminals TA1 and TA2, and the first switch SW1 is electrically connected between the pair of connection terminals TA1 and TA2. In other words, inside the load control device 1, the connection terminal TA1 and the connection terminal TA2 are electrically connected via the first switch SW1. One connection terminal TA1 is connected to the AC power supply 2, and the other connection terminal TA2 is connected to the load 3, so that the first switch SW1 is connected between the AC power supply 2 and the load 3.
　また、第２スイッチＳＷ２は、例えば、トランジスタ又は双方向サイリスタ等の半導体スイッチにて実現される。第２スイッチＳＷ２は上記の電流経路ＲＴ１，ＲＴ２に挿入されている。負荷制御装置１は、第２スイッチＳＷ２を電子的に制御することにより、電流経路ＲＴ１，ＲＴ２を介して容量素子１２に電流が流れる状態と、電流経路ＲＴ１，ＲＴ２を遮断する状態とを電子的に切り替える、いわゆる電子スイッチである。第２スイッチＳＷ２がオン状態に制御されると、電流経路ＲＴ１，ＲＴ２を介して容量素子１２に電流が流れ、第２スイッチＳＷ２がオフ状態に制御されると、容量素子１２に電流を流す電流経路ＲＴ１，ＲＴ２が遮断される。 Further, the second switch SW2 is realized by, for example, a semiconductor switch such as a transistor or a bidirectional thyristor. The second switch SW2 is inserted in the above current paths RT1 and RT2. By electronically controlling the second switch SW2, the load control device 1 electronically controls a state in which a current flows through the capacitance element 12 via the current paths RT1 and RT2 and a state in which the current paths RT1 and RT2 are cut off. It is a so-called electronic switch that switches to. When the second switch SW2 is controlled to the ON state, a current flows through the capacitance element 12 via the current paths RT1 and RT2, and when the second switch SW2 is controlled to the OFF state, a current flows through the capacitance element 12. Routes RT1 and RT2 are blocked.
　容量素子１２は、充放電が可能な素子であって、本実施形態では例えばコンデンサである。なお、容量素子１２はコンデンサに限定されず、電気二重層コンデンサでもよいし、二次電池などでもよい。 The capacitance element 12 is an element capable of charging and discharging, and is, for example, a capacitor in this embodiment. The capacitive element 12 is not limited to a capacitor, and may be an electric double layer capacitor, a secondary battery, or the like.
　制御部１１は、交流電圧Ｖａｃの各半周期に、負荷３への供給電力に応じて決定した導通期間に第１スイッチＳＷ１をオン状態に制御するので、導通期間に応じた供給電力を負荷３に供給することができる。ここで、交流電圧Ｖａｃの各半周期の途中の切替タイミングに、第１スイッチＳＷ１のオン／オフが切り替わると、第１スイッチＳＷ１が接続されている回路（交流電源２及び負荷３と負荷制御装置１とを接続する電路等）のインダクタンス（以下、系統のインダクタンスという）等に起因して逆起電圧が発生する可能性がある。本実施形態の負荷制御装置１では、上記の切替タイミングに第２スイッチＳＷ２をオン状態にすることによって、第１スイッチＳＷ１のオン／オフの切り替わりによって発生する逆起電圧を容量素子１２で吸収することができ、負荷制御装置１が発生するノイズを低減できる。したがって、本実施形態の負荷制御装置１では、ノイズを低減するために、第１スイッチＳＷ１のターンオフ速度又はターンオン速度を低速にする必要がなく、第１スイッチＳＷ１での損失を低減し、第１スイッチＳＷ１の発熱を抑制することができる。また、第２スイッチＳＷ２がオフになると、交流電源２から容量素子１２に電流が流れる電流経路ＲＴ１，ＲＴ２が遮断されるので、負荷３に不要な電流が流れるのを抑制することができる。 Since the control unit 11 controls the first switch SW1 to be in the ON state during the conduction period determined according to the power supply to the load 3 in each half cycle of the AC voltage Vac, the control unit 11 applies the supply power according to the conduction period to the load 3. Can be supplied to. Here, when the on / off of the first switch SW1 is switched at the switching timing in the middle of each half cycle of the AC voltage Vac, the circuit to which the first switch SW1 is connected (AC power supply 2 and load 3 and the load control device). A counter electromotive voltage may be generated due to the inductance of the electric circuit or the like connecting to 1 (hereinafter referred to as the inductance of the system) or the like. In the load control device 1 of the present embodiment, by turning on the second switch SW2 at the above switching timing, the capacitive element 12 absorbs the counter electromotive voltage generated by switching the first switch SW1 on / off. This makes it possible to reduce the noise generated by the load control device 1. Therefore, in the load control device 1 of the present embodiment, it is not necessary to reduce the turn-off speed or the turn-on speed of the first switch SW1 in order to reduce noise, and the loss in the first switch SW1 is reduced and the first switch SW1 is first. The heat generation of the switch SW1 can be suppressed. Further, when the second switch SW2 is turned off, the current paths RT1 and RT2 in which the current flows from the AC power supply 2 to the capacitive element 12 are cut off, so that it is possible to suppress the flow of unnecessary current to the load 3.
　（２）詳細
　（２．１）前提
　本実施形態では、負荷制御装置１は、建物の取付対象物に固定される。本開示でいう「取付対象物」は、負荷制御装置１が固定される物体であって、例えば、建物の壁、天井若しくは床等の造営物、又は机、棚、若しくはカウンタ台等の什器（建具を含む）等を含む。負荷制御装置１が設置される建物は、例えば、戸建住宅若しくは集合住宅等の住宅施設、又は事務所、店舗、学校、工場、病院若しくは介護施設等の非住宅施設である。 (2) Details (2.1) Premise In the present embodiment, the load control device 1 is fixed to an object to be mounted on the building. The "mounting object" referred to in the present disclosure is an object to which the load control device 1 is fixed, for example, a building such as a wall, a ceiling or a floor of a building, or a fixture such as a desk, a shelf, or a counter stand. Including fittings) etc. The building in which the load control device 1 is installed is, for example, a residential facility such as a detached house or an apartment house, or a non-residential facility such as an office, a store, a school, a factory, a hospital, or a nursing facility.
　本実施形態では一例として、負荷制御装置１は、住宅の壁からなる取付対象物に取り付けられる、埋込型の配線器具であると仮定する。また、交流電源２は、例えば、単相１００〔Ｖ〕、６０〔Ｈｚ〕の商用の交流電源（系統電源）であると仮定する。さらに、負荷３は、例えば調光可能な照明負荷を含む。本実施形態では、負荷３は、ＬＥＤ（Light Emitting Diode）からなる光源と、光源を点灯させる点灯回路と、を備える照明装置（照明器具）であると仮定する。この負荷３では、交流電源２からの電力供給時に光源が点灯し、交流電源２から供給される供給電力の大きさに応じて光出力が変化する。 In the present embodiment, as an example, it is assumed that the load control device 1 is an embedded wiring device that is attached to an object to be attached made of a wall of a house. Further, it is assumed that the AC power supply 2 is, for example, a single-phase 100 [V], 60 [Hz] commercial AC power supply (system power supply). Further, the load 3 includes, for example, a dimmable lighting load. In the present embodiment, it is assumed that the load 3 is a lighting device (lighting fixture) including a light source including an LED (Light Emitting Diode) and a lighting circuit for lighting the light source. In this load 3, the light source is turned on when the power is supplied from the AC power supply 2, and the light output changes according to the magnitude of the supplied power supplied from the AC power supply 2.
　また、負荷制御装置１は、電線を接続するための接続端子ＴＡ１，ＴＡ２を備えており、例えば、壁（取付対象物）内に引き回された電線が接続端子ＴＡ１，ＴＡ２に接続されることで、電線を介して交流電源２及び負荷３に電気的に接続される。電線は、交流電源２（系統電源等）に対しては、直接的に接続されてもよいし、分電盤等を介して間接的に接続されてもよい。 Further, the load control device 1 is provided with connection terminals TA1 and TA2 for connecting electric wires. For example, an electric wire routed in a wall (mounting object) is connected to the connection terminals TA1 and TA2. Then, it is electrically connected to the AC power supply 2 and the load 3 via the electric wire. The electric wire may be directly connected to the AC power source 2 (system power source or the like), or may be indirectly connected to the AC power source 2 (system power source or the like) via a distribution board or the like.
　また、本開示でいう接続端子ＴＡ１，ＴＡ２等の「端子」は、電線等を接続するための部品でなくてもよく、例えば、電子部品のリード、又は回路基板に含まれる導体の一部等であってもよい。 Further, the "terminals" such as the connection terminals TA1 and TA2 referred to in the present disclosure do not have to be parts for connecting electric wires or the like, and are, for example, leads of electronic parts or a part of a conductor included in a circuit board. It may be.
　また、本開示において、２値の比較において、「以上」としているところは、２値が等しい場合、及び２値の一方が他方を超えている場合との両方を含む。ただし、これに限らず、ここでいう「以上」は、２値の一方が他方を超えている場合のみを含む「より大きい」と同義であってもよい。つまり、２値が等しい場合を含むか否かは、基準値等の設定次第で任意に変更できるので、「以上」か「より大きい」かに技術上の差異はない。同様に、「未満」においても「以下」と同義であってもよい。 Further, in the present disclosure, the place where "greater than or equal to" is used in the comparison of the two values includes both the case where the two values are equal and the case where one of the two values exceeds the other. However, the present invention is not limited to this, and "greater than or equal to" here may be synonymous with "greater than" including only the case where one of the two values exceeds the other. That is, whether or not the two values are equal can be arbitrarily changed depending on the setting of the reference value or the like, so there is no technical difference between "greater than or equal to" and "greater than". Similarly, "less than" may be synonymous with "less than or equal to".
　（２．２）負荷制御装置の全体構成
　以下に、本実施形態に係る負荷制御装置１の全体構成について、図１を参照して説明する。 (2.2) Overall Configuration of Load Control Device The overall configuration of the load control device 1 according to the present embodiment will be described below with reference to FIG.
　本実施形態の負荷制御装置１は、図１に示すように、上記した一対の接続端子ＴＡ１，ＴＡ２と、第１スイッチＳＷ１と、容量素子１２と、第２スイッチＳＷ２と、制御部１１と、を備える。また、本実施形態の負荷制御装置１は、ゼロクロス（図中「ＺＣ」と表記）検出部１５，１６と、第１駆動回路１７と、第２駆動回路１８と、電源部１９と、操作受付部２０と、を更に備えている。これらの負荷制御装置１の構成部品は、１つの筐体に収納されている。 As shown in FIG. 1, the load control device 1 of the present embodiment includes the pair of connection terminals TA1 and TA2, the first switch SW1, the capacitive element 12, the second switch SW2, and the control unit 11. To prepare for. Further, the load control device 1 of the present embodiment includes zero cross (denoted as "ZC" in the figure) detection units 15 and 16, a first drive circuit 17, a second drive circuit 18, a power supply unit 19, and an operation reception. The unit 20 is further provided. The components of these load control devices 1 are housed in one housing.
　一対の接続端子ＴＡ１，ＴＡ２の各々は、電線が電気的かつ機械的に接続される部品である。一対の接続端子ＴＡ１，ＴＡ２の各々は、一例として、端子孔から電線を差し込むことによって電線が接続される、電線差込式のいわゆる速結端子である。 Each of the pair of connection terminals TA1 and TA2 is a component to which electric wires are electrically and mechanically connected. Each of the pair of connection terminals TA1 and TA2 is, for example, a wire insertion type so-called quick connection terminal to which an electric wire is connected by inserting an electric wire from a terminal hole.
　第１スイッチＳＷ１は、交流電源２と負荷３との間に挿入され、交流電源２と負荷３との間の導通状態と遮断状態とを切り替える。本開示でいう「挿入」とは、電気的に接続される二者間への挿入を意味し、第１スイッチＳＷ１は、交流電源２と負荷３とで構成される回路において交流電源２と負荷３との間に電気的に接続されることになる。言い換えれば、負荷３は、交流電源２に対し、第１スイッチＳＷ１を介して電気的に接続される。 The first switch SW1 is inserted between the AC power supply 2 and the load 3 to switch between the conduction state and the cutoff state between the AC power supply 2 and the load 3. The term "insertion" as used in the present disclosure means insertion between two electrically connected parties, and the first switch SW1 is a circuit composed of an AC power supply 2 and a load 3 and has an AC power supply 2 and a load. It will be electrically connected to 3. In other words, the load 3 is electrically connected to the AC power supply 2 via the first switch SW1.
　本実施形態では一例として、第１スイッチＳＷ１は、一対の接続端子ＴＡ１，ＴＡ２間において、電気的に直列に接続された２つのＭＯＳＦＥＴ（Metal-Oxide-Semiconductor Field Effect Transistor）Ｑ１１，Ｑ１２を有している。これら２つのＭＯＳＦＥＴＱ１１，Ｑ１２の各々は、エンハンスメント形のｎチャネルＭＯＳＦＥＴである。２つのＭＯＳＦＥＴＱ１１，Ｑ１２は、ソース端子同士が互いに接続される、つまり、いわゆる逆直列に接続されることにより、双方向の電流について、導通／遮断を切り替える。 As an example in the present embodiment, the first switch SW1 has two MOSFETs (Metal-Oxide-Semiconductor Field Effect Transistor) Q11 and Q12 electrically connected in series between the pair of connection terminals TA1 and TA2. ing. Each of these two MOSFETs Q11 and Q12 is an enhanced n-channel MOSFET. The two MOSFETs Q11 and Q12 switch between conduction and cutoff for bidirectional current by connecting the source terminals to each other, that is, by connecting them in so-called anti-series.
　各ＭＯＳＦＥＴＱ１１，Ｑ１２のゲート端子は、第１駆動回路１７に電気的に接続されている。第１駆動回路１７は、制御部１１からの制御信号が入力されることにより、各ＭＯＳＦＥＴＱ１１，Ｑ１２のゲート端子に制御信号Ｓａ１，Ｓａ２を出力して、各ＭＯＳＦＥＴＱ１１，Ｑ１２を駆動する。 The gate terminals of the MOSFETs Q11 and Q12 are electrically connected to the first drive circuit 17. When the control signal from the control unit 11 is input, the first drive circuit 17 outputs the control signals Sa1 and Sa2 to the gate terminals of the MOSFETs Q11 and Q12 to drive the MOSFETs Q11 and Q12.
　また、上述したように、第１スイッチＳＷ１は、その動作状態として、オン状態とオフ状態とを含んでいる。このうちのオン状態とは、交流電圧Ｖａｃの各半周期において、制御部１１が決定した導通期間に導通している状態、すなわち間欠的に導通している状態を含む。つまり、本実施形態において、第１スイッチＳＷ１のオン状態とは、交流電源２から負荷３への電力の供給が行われる状態であり、第１スイッチＳＷ１のオフ状態とは、交流電源２から負荷３への電力の供給が遮断される状態である。 Further, as described above, the first switch SW1 includes an on state and an off state as its operating state. Among these, the on state includes a state in which the AC voltage Vac is electrically connected during the conduction period determined by the control unit 11, that is, a state in which the AC voltage is intermittently conducted in each half cycle. That is, in the present embodiment, the on state of the first switch SW1 is a state in which power is supplied from the AC power supply 2 to the load 3, and the off state of the first switch SW1 is a load from the AC power supply 2. The power supply to 3 is cut off.
　ここでは、第１スイッチＳＷ１が非導通の状態（オフ状態）で、第１スイッチＳＷ１の両端間には交流電源２から交流電圧Ｖａｃが印加されることと仮定する。つまり、第１スイッチＳＷ１がオフ状態であれば、第１スイッチＳＷ１の両端間に印加される電圧（以下、「スイッチ間電圧」ともいう）は、交流電源２からの交流電圧Ｖａｃと略等しくなる。また、以下では、接続端子ＴＡ１が高電位となるスイッチ間電圧の極性を「正極性」、接続端子ＴＡ２が高電位となるスイッチ間電圧の極性を「負極性」という。 Here, it is assumed that the first switch SW1 is in a non-conducting state (off state), and an AC voltage Vac is applied from the AC power supply 2 between both ends of the first switch SW1. That is, when the first switch SW1 is in the off state, the voltage applied between both ends of the first switch SW1 (hereinafter, also referred to as “switch-to-switch voltage”) is substantially equal to the AC voltage Vac from the AC power supply 2. .. Further, in the following, the polarity of the voltage between switches at which the connection terminal TA1 has a high potential is referred to as “positive electrode property”, and the polarity of the voltage between switches at which the connection terminal TA2 has a high potential is referred to as “negative electrode property”.
　ゼロクロス検出部１５，１６は、スイッチ間電圧の大きさを検出することで、スイッチ間電圧のゼロクロス点を検出するように構成されている。 The zero- cross detection units 15 and 16 are configured to detect the zero-cross point of the switch-to-switch voltage by detecting the magnitude of the switch-to-switch voltage.
　ゼロクロス検出部１５は、接続端子ＴＡ１に電気的に接続されている。ゼロクロス検出部１５は、接続端子ＴＡ１－グランド（基準電位点）間電圧の絶対値と基準値（例えば、１０〔Ｖ〕）とを比較することにより、スイッチ間電圧が負極性から正極性に切り替わる際のゼロクロス点を検出する。つまり、ゼロクロス検出部１５は、正極性のスイッチ間電圧が基準値未満の状態から基準値以上の状態に移行したことを検出すると、ゼロクロス点と判断する。 The zero cross detection unit 15 is electrically connected to the connection terminal TA1. The zero-cross detection unit 15 switches the voltage between switches from negative to positive by comparing the absolute value of the voltage between the connection terminals TA1-ground (reference potential point) with the reference value (for example, 10 [V]). Detects the zero crossing point at the time. That is, when the zero-cross detection unit 15 detects that the positive inter-switch voltage has shifted from a state below the reference value to a state above the reference value, it determines that it is a zero-cross point.
　ゼロクロス検出部１６は、接続端子ＴＡ２に電気的に接続されている。ゼロクロス検出部１６は、端子ＴＡ２－グランド（基準電位点）間電圧の絶対値と基準値（例えば、１０〔Ｖ〕）とを比較することにより、スイッチ間電圧が正極性から負極性に切り替わる際のゼロクロス点を検出する。つまり、ゼロクロス検出部１６は、負極性のスイッチ間電圧が基準値未満の状態から基準値以上の状態に移行したことを検出すると、ゼロクロス点と判断する。 The zero cross detection unit 16 is electrically connected to the connection terminal TA2. The zero-cross detection unit 16 compares the absolute value of the voltage between the terminals TA2-ground (reference potential point) with the reference value (for example, 10 [V]) when the voltage between switches switches from positive to negative. Detects the zero crossing point of. That is, when the zero cross detection unit 16 detects that the negative electrode inter-switch voltage has shifted from a state below the reference value to a state above the reference value, it determines that the zero cross point is reached.
　したがって、ゼロクロス検出部１５，１６で検出されるゼロクロス点の検出タイミングは、厳密な意味でのゼロクロス点（０〔Ｖ〕）から少し時間が遅れることになる。 Therefore, the detection timing of the zero cross point detected by the zero cross detection units 15 and 16 is slightly delayed from the zero cross point (0 [V]) in the strict sense.
　電源部１９は、第１スイッチＳＷ１の両端に印加される電圧から、制御部１１等の回路の動作用の電力を生成する。電源部１９は、ダイオードＤ１を介して接続端子ＴＡ１に電気的に接続され、ダイオードＤ２を介して接続端子ＴＡ２に電気的に接続される。ここで、ダイオードＤ１，Ｄ２と、ＭＯＳＦＥＴＱ１１，Ｑ１２のボディダイオードＤ１１，Ｄ１２とで整流回路ＤＢ１が構成されており、交流電源２からの交流電圧Ｖａｃを整流回路ＤＢ１で全波整流した後の直流電圧が電源部１９に入力される。電源部１９は、シリーズレギュレータ、降圧チョッパ回路、昇降圧チョッパ回路、又は昇圧チョッパ回路等の電圧変換回路を含み、整流回路ＤＢ１からの出力電圧を平滑化することで、定電圧の直流電圧を制御部１１等の回路に供給する。 The power supply unit 19 generates electric power for operating a circuit such as the control unit 11 from the voltage applied to both ends of the first switch SW1. The power supply unit 19 is electrically connected to the connection terminal TA1 via the diode D1 and electrically connected to the connection terminal TA2 via the diode D2. Here, the rectifier circuit DB1 is composed of the diodes D1 and D2 and the body diodes D11 and D12 of the MOSFETs Q11 and Q12, and the DC voltage after the AC voltage Vac from the AC power supply 2 is full-wave rectified by the rectifier circuit DB1. Is input to the power supply unit 19. The power supply unit 19 includes a voltage conversion circuit such as a series regulator, a step-down chopper circuit, a buck-boost chopper circuit, or a step-up chopper circuit, and controls a constant voltage DC voltage by smoothing the output voltage from the rectifier circuit DB1. It is supplied to the circuit of the unit 11 and the like.
　また、本実施形態では、接続端子ＴＡ１と接続端子ＴＡ２との間に、容量素子１２と、第２スイッチＳＷ２とが直列に接続されている。換言すれば、第１スイッチＳＷ１と並列に、第２スイッチＳＷ２及び容量素子１２の直列回路が接続されている。 Further, in the present embodiment, the capacitive element 12 and the second switch SW2 are connected in series between the connection terminal TA1 and the connection terminal TA2. In other words, a series circuit of the second switch SW2 and the capacitive element 12 is connected in parallel with the first switch SW1.
　容量素子１２は、接続端子ＴＡ１と第２スイッチＳＷ２との間に接続されている。本実施形態では、容量素子１２は例えば１つのコンデンサであるが、直列又は並列に接続された複数のコンデンサでもよい。 The capacitive element 12 is connected between the connection terminal TA1 and the second switch SW2. In the present embodiment, the capacitance element 12 is, for example, one capacitor, but may be a plurality of capacitors connected in series or in parallel.
　本実施形態では一例として、第２スイッチＳＷ２は、容量素子１２と接続端子ＴＡ２との間において、電気的に直列に接続された２つのＭＯＳＦＥＴＱ２１，Ｑ２２を有している。これら２つのＭＯＳＦＥＴＱ２１，Ｑ２２の各々は、エンハンスメント形のｎチャネルＭＯＳＦＥＴである。２つのＭＯＳＦＥＴＱ２１，Ｑ２２は、ソース端子同士が互いに接続される、つまり、いわゆる逆直列に接続されることにより、双方向の電流について、導通／遮断を切り替える。 As an example in this embodiment, the second switch SW2 has two MOSFETs Q21 and Q22 electrically connected in series between the capacitive element 12 and the connection terminal TA2. Each of these two MOSFETs Q21 and Q22 is an enhanced n-channel MOSFET. The two MOSFETs Q21 and Q22 switch between conduction and cutoff for bidirectional current by connecting the source terminals to each other, that is, by connecting them in so-called anti-series.
　各ＭＯＳＦＥＴＱ２１，Ｑ２２のゲート端子は、第２駆動回路１８に電気的に接続されている。第２駆動回路１８は、制御部１１からの制御信号が入力されることにより、各ＭＯＳＦＥＴＱ２１，Ｑ２２のゲート端子に制御信号Ｓｂ１，Ｓｂ２を出力して、各ＭＯＳＦＥＴＱ２１，Ｑ２２を駆動する。 The gate terminals of the MOSFETs Q21 and Q22 are electrically connected to the second drive circuit 18. When the control signal from the control unit 11 is input, the second drive circuit 18 outputs the control signals Sb1 and Sb2 to the gate terminals of the MOSFETs Q21 and Q22 to drive the MOSFETs Q21 and Q22.
　操作受付部２０は、例えば、表示機能及びタッチセンサ機能を有するタッチパネルである。この種のタッチパネルは、ユーザインタフェースとして機能する。タッチパネルは、例えば、負荷制御装置１の動作状況等の情報を表示することで人に提示したり、負荷制御装置１の動作を変更するための人のタッチ操作を受けて操作信号を制御部１１に出力したりすることが可能である。本実施形態では、操作受付部２０は、例えば、負荷３の点灯及び消灯を切り替える操作、又は、負荷３の調光レベルを切り替える操作を受けて、操作信号を制御部１１に出力する。制御部１１は、操作受付部２０から入力される操作信号に基づき、第１スイッチＳＷ１を制御する。なお、操作受付部２０は、タッチパネルを有するものに限定されず、人の操作を受け付けるためのメカニカルなスイッチ、又は、スイッチ付ボリューム等を備えるものでもよい。 The operation reception unit 20 is, for example, a touch panel having a display function and a touch sensor function. This type of touch panel functions as a user interface. The touch panel, for example, presents information to a person by displaying information such as the operation status of the load control device 1, or receives an operation signal of the person to change the operation of the load control device 1 and outputs an operation signal to the control unit 11. It is possible to output to. In the present embodiment, the operation receiving unit 20 outputs an operation signal to the control unit 11 in response to, for example, an operation of switching the on / off of the load 3 or an operation of switching the dimming level of the load 3. The control unit 11 controls the first switch SW1 based on the operation signal input from the operation reception unit 20. The operation receiving unit 20 is not limited to the one having a touch panel, and may be provided with a mechanical switch for receiving a human operation, a volume with a switch, or the like.
　また、操作受付部２０は、人の操作に応じて負荷３の制御命令を含む無線信号を送信する発信器から、制御命令を受け付け、この制御命令を操作信号として制御部１１に出力するものでもよい。この種の無線通信は、例えば、９２０ＭＨｚ帯の特定小電力無線局（免許を要しない無線局）、Wi-Fi（登録商標）、又はBluetooth（登録商標）等の通信規格に準拠した無線通信等である。無線通信部を有する操作受付部２０が、送信器と無線通信を行うことで、送信機から無線通信を受信することができ、制御部１１は、送信機からの無線信号に基づいて第１スイッチＳＷ１を制御することが可能になる。 Further, the operation reception unit 20 may receive a control command from a transmitter that transmits a radio signal including a control command of the load 3 in response to a human operation, and output this control command to the control unit 11 as an operation signal. good. This type of wireless communication includes, for example, wireless communication conforming to communication standards such as a specified low power wireless station (a wireless station that does not require a license), Wi-Fi (registered trademark), or Bluetooth (registered trademark) in the 920 MHz band. Is. The operation reception unit 20 having a wireless communication unit can receive wireless communication from the transmitter by performing wireless communication with the transmitter, and the control unit 11 is the first switch based on the wireless signal from the transmitter. It becomes possible to control SW1.
　制御部１１は、例えば、１以上のプロセッサ及び１以上のメモリを有するマイクロコントローラを主構成として備えている。マイクロコントローラは、１以上のメモリに記録されているプログラムを１以上のプロセッサで実行することにより、制御部１１としての機能を実現する。プログラムは、予めメモリに記録されていてもよいし、メモリカードのような非一時的記録媒体に記録されて提供されたり、電気通信回線を通して提供されたりしてもよい。言い換えれば、上記プログラムは、１以上のプロセッサを、制御部１１として機能させるためのプログラムである。 The control unit 11 includes, for example, a microcontroller having one or more processors and one or more memories as a main configuration. The microcontroller realizes the function as the control unit 11 by executing the program recorded in one or more memories by one or more processors. The program may be pre-recorded in memory, may be recorded and provided on a non-temporary recording medium such as a memory card, or may be provided through a telecommunication line. In other words, the above program is a program for making one or more processors function as the control unit 11.
　制御部１１は、少なくとも第１スイッチＳＷ１及び第２スイッチＳＷ２をオン／オフ制御する。具体的には、制御部１１は、図２に示すように、ゼロクロス検出部１５，１６から、それぞれ検出結果を表す検出信号ＺＣ１，ＺＣ２を取得する。また、制御部１１は、操作受付部２０が人の操作に応じて出力する操作信号を取得する。また、制御部１１は、第１スイッチＳＷ１を制御するための制御信号を第１駆動回路１７に出力し、第２スイッチＳＷ２を制御するための制御信号を第２駆動回路１８に出力する。さらに、制御部１１は、位相制御又はＰＷＭ（Pulse Width Modulation）制御によって、単位時間当たりに交流電源２から負荷３へ供給される供給電力（すなわち電力量）を調節するように、第１スイッチＳＷ１を制御（以下、「負荷制御」ともいう）してもよい。本実施形態では、制御部１１が、交流電圧Ｖａｃの半周期の始点から導通期間が経過するまで第１スイッチＳＷ１をオン状態に制御し、導通期間の経過後に第１スイッチＳＷ１をオフ状態に制御する位相制御（いわゆる逆位相制御）を行う。第１スイッチＳＷ１は、交流電圧Ｖａｃの半周期の始点でオフ状態からオン状態に切り替わるので、オン状態への切替時に発生するノイズを低減できる。なお、第１スイッチＳＷ１は、交流電圧Ｖａｃの半周期の始点でオフ状態からオン状態に切り替わるのであるが、交流電圧Ｖａｃのゼロクロス点でオフ状態からオン状態に切り替わるものに限定されず、ゼロクロスを検出した時点でオフ状態からオン状態に切り替わるものでもよい。 The control unit 11 controls at least the first switch SW1 and the second switch SW2 on / off. Specifically, as shown in FIG. 2, the control unit 11 acquires the detection signals ZC1 and ZC2 representing the detection results from the zero cross detection units 15 and 16, respectively. Further, the control unit 11 acquires an operation signal output by the operation reception unit 20 in response to a human operation. Further, the control unit 11 outputs a control signal for controlling the first switch SW1 to the first drive circuit 17, and outputs a control signal for controlling the second switch SW2 to the second drive circuit 18. Further, the control unit 11 adjusts the supply power (that is, the amount of power) supplied from the AC power supply 2 to the load 3 per unit time by phase control or PWM (Pulse Width Modulation) control, so that the first switch SW1 May be controlled (hereinafter, also referred to as “load control”). In the present embodiment, the control unit 11 controls the first switch SW1 to be in the on state until the conduction period elapses from the start point of the half cycle of the AC voltage Vac, and controls the first switch SW1 to the off state after the continuation period elapses. Performs phase control (so-called anti-phase control). Since the first switch SW1 switches from the off state to the on state at the start point of the half cycle of the AC voltage Vac, the noise generated at the time of switching to the on state can be reduced. The first switch SW1 switches from the off state to the on state at the start point of the half cycle of the AC voltage Vac, but is not limited to the one that switches from the off state to the on state at the zero cross point of the AC voltage Vac. It may be the one that switches from the off state to the on state at the time of detection.
　また、制御部１１は、交流電圧Ｖａｃの各半周期の途中で第１スイッチＳＷ１のオン／オフが切り替わる切替タイミングに、第２スイッチＳＷ２をオン状態に制御する。逆位相制御の場合、制御部１１は、交流電圧Ｖａｃの各半周期の途中で第１スイッチＳＷ１がオンからオフに切り替わる切替タイミングに、第２スイッチＳＷ２をオン状態に制御する。第２スイッチＳＷ２がオン状態になると、交流電源２から容量素子１２に電流が流れる電流経路ＲＴ１又はＲＴ２が形成される。切替タイミングでは、一対の接続端子ＴＡ１，ＴＡ２の間で第１スイッチＳＷ１と並列に容量素子１２が接続された状態となるので、第１スイッチＳＷ１のオフ時に発生する逆起電圧を容量素子１２で吸収することができ、交流電圧Ｖａｃに重畳するノイズを低減することができる。 Further, the control unit 11 controls the second switch SW2 to the on state at the switching timing in which the on / off of the first switch SW1 is switched in the middle of each half cycle of the AC voltage Vac. In the case of anti-phase control, the control unit 11 controls the second switch SW2 to the on state at the switching timing when the first switch SW1 switches from on to off in the middle of each half cycle of the AC voltage Vac. When the second switch SW2 is turned on, the current path RT1 or RT2 in which a current flows from the AC power supply 2 to the capacitive element 12 is formed. At the switching timing, the capacitive element 12 is connected in parallel with the first switch SW1 between the pair of connection terminals TA1 and TA2, so that the counter electromotive voltage generated when the first switch SW1 is turned off is generated by the capacitive element 12. It can be absorbed and the noise superimposed on the AC voltage Vac can be reduced.
　（２．３）負荷制御装置の動作
　次に、本実施形態に係る負荷制御装置１の動作について、図１及び図２を参照して説明する。 (2.3) Operation of the load control device Next, the operation of the load control device 1 according to the present embodiment will be described with reference to FIGS. 1 and 2.
　（２．３．１）起動動作
　まず、本実施形態の負荷制御装置１の通電開始時の起動動作について説明する。 (2.3.1) Start-up operation First, the start-up operation at the start of energization of the load control device 1 of the present embodiment will be described.
　負荷制御装置１は、起動直後、つまり電源供給が開始した直後においては、第１スイッチＳＷ１及び第２スイッチＳＷ２がオフ状態となり、交流電圧Ｖａｃを整流回路ＤＢ１で全波整流した後の直流電圧が電源部１９に供給される。電源部１９は、整流回路ＤＢ１から入力される直流電圧を、所定電圧値の直流電圧に変換して制御部１１に供給し、制御部１１が動作を開始する。 Immediately after the load control device 1 is started, that is, immediately after the power supply is started, the first switch SW1 and the second switch SW2 are turned off, and the DC voltage after full-wave rectification of the AC voltage Vac by the rectifier circuit DB1 is obtained. It is supplied to the power supply unit 19. The power supply unit 19 converts the DC voltage input from the rectifier circuit DB 1 into a DC voltage having a predetermined voltage value and supplies the DC voltage to the control unit 11, and the control unit 11 starts operation.
　制御部１１は、操作受付部２０から入力される操作信号に応じて第１スイッチＳＷ１のオン／オフを制御する。操作受付部２０から負荷３を消灯させる信号が入力されている場合、制御部１１は、第１駆動回路１７を制御して第１スイッチＳＷ１（つまりＭＯＳＦＥＴＱ１１，Ｑ１２）をオフ状態に制御し、交流電源２から負荷３への電力供給を遮断する。また、制御部１１は、第１スイッチＳＷ１をオフ状態に制御する場合、第２駆動回路１８を制御して第２スイッチＳＷ２（つまりＭＯＳＦＥＴＱ２１，Ｑ２２）をオフ状態に制御する。 The control unit 11 controls the on / off of the first switch SW1 according to the operation signal input from the operation reception unit 20. When a signal for turning off the load 3 is input from the operation reception unit 20, the control unit 11 controls the first drive circuit 17 to control the first switch SW1 (that is, MOSFETs Q11 and Q12) to the off state, and AC. The power supply from the power supply 2 to the load 3 is cut off. Further, when the control unit 11 controls the first switch SW1 to the off state, the control unit 11 controls the second drive circuit 18 to control the second switch SW2 (that is, MOSFETs Q21 and Q22) to the off state.
　（２．３．２）調光動作
　次に、本実施形態の負荷制御装置１の調光動作について、図２を参照して説明する。図２には、交流電圧Ｖａｃ、負荷３に印加される負荷電圧Ｖ１、ゼロクロス検出部１５，１６の検出信号ＺＣ１，ＺＣ２、ＭＯＳＦＥＴＱ１１，Ｑ１２のゲート端子に入力される制御信号Ｓａ１，Ｓａ２、ＭＯＳＦＥＴＱ２１，Ｑ２２のゲート端子に入力される制御信号Ｓｂ１，Ｓｂ２、を示している。ここで、検出信号ＺＣ１はゼロクロス検出部１５による検出信号であり、検出信号ＺＣ２はゼロクロス検出部１６による検出信号である。なお、ここでは、検出信号ＺＣ１，ＺＣ２が「Ｈ」レベルから「Ｌ」レベルに変化することをもって、検出信号ＺＣ１，ＺＣ２が発生したこととする。つまり、検出信号ＺＣ１，ＺＣ２は、ゼロクロス点の検出時に「Ｈ」レベルから「Ｌ」レベルに変化する信号である。 (2.3.2) Dimming Operation Next, the dimming operation of the load control device 1 of the present embodiment will be described with reference to FIG. FIG. 2 shows the AC voltage Vac, the load voltage V1 applied to the load 3, the detection signals ZC1 and ZC2 of the zero cross detection units 15 and 16, and the control signals Sa1 and Sa2 and MOSFETQ21 input to the gate terminals of the MOSFETs Q11 and Q12. The control signals Sb1 and Sb2, which are input to the gate terminal of Q22, are shown. Here, the detection signal ZC1 is a detection signal by the zero cross detection unit 15, and the detection signal ZC2 is a detection signal by the zero cross detection unit 16. Here, it is assumed that the detection signals ZC1 and ZC2 are generated when the detection signals ZC1 and ZC2 change from the “H” level to the “L” level. That is, the detection signals ZC1 and ZC2 are signals that change from the "H" level to the "L" level when the zero cross point is detected.
　まず、交流電圧Ｖａｃが正極性の半周期における負荷制御装置１の動作について説明する。負荷制御装置１は、位相制御の基準となる交流電圧Ｖａｃのゼロクロス点をゼロクロス検出部１５で検出する。交流電圧Ｖａｃが負極性の半周期から正極性の半周期に移行する際には、交流電圧Ｖａｃが正極性の規定値「Ｖｚｃ」に達すると、ゼロクロス検出部１５が検出信号ＺＣ１を出力する。本実施形態では、検出信号ＺＣ１の発生時点を第１時点ｔ１とし、半周期の始点（ゼロクロス点）ｔ０から第１時点ｔ１までの期間を、第一の期間Ｔ１とする。 First, the operation of the load control device 1 in a half cycle in which the AC voltage Vac is positive will be described. The load control device 1 detects the zero cross point of the AC voltage Vac, which is the reference of the phase control, by the zero cross detection unit 15. When the AC voltage Vac shifts from the negative half cycle to the positive half cycle, when the AC voltage Vac reaches the specified positive value “Vzc”, the zero cross detection unit 15 outputs the detection signal ZC1. In the present embodiment, the time point at which the detection signal ZC1 is generated is defined as the first time point t1, and the period from the start point (zero cross point) t0 of the half cycle to the first time point t1 is defined as the first time period T1.
　ここで、半周期の始点ｔ０から第１時点ｔ１までの第一の期間Ｔ１では、制御部１１は第１駆動回路１７に第１スイッチＳＷ１をオフ状態にする制御信号を出力する。第１駆動回路１７は、この制御信号に応じて制御信号Ｓａ１，Ｓａ２として「ＯＦＦ」信号を出力する。これにより、第一の期間Ｔ１では、２個のＭＯＳＦＥＴＱ１１，Ｑ１２がいずれもオフ状態になり、第１スイッチＳＷ１がオフ状態となる。また、第１時点ｔ１において、制御部１１は第１駆動回路１７に制御信号を出力し、第１駆動回路１７から制御信号Ｓａ１，Ｓａ２として「ＯＮ」信号を出力させる。これにより、第１時点ｔ１において第１スイッチＳＷ１がオフ状態からオン状態に切り替えられ、交流電源２から負荷３に電力が供給される。 Here, in the first period T1 from the start point t0 of the half cycle to the first time point t1, the control unit 11 outputs a control signal for turning off the first switch SW1 to the first drive circuit 17. The first drive circuit 17 outputs an "OFF" signal as control signals Sa1 and Sa2 in response to this control signal. As a result, in the first period T1, both of the two MOSFETs Q11 and Q12 are turned off, and the first switch SW1 is turned off. Further, at the first time point t1, the control unit 11 outputs a control signal to the first drive circuit 17, and causes the first drive circuit 17 to output an “ON” signal as the control signals Sa1 and Sa2. As a result, the first switch SW1 is switched from the off state to the on state at the first time point t1, and power is supplied from the AC power supply 2 to the load 3.
　制御部１１は、第１時点ｔ１から導通期間（第二の期間）Ｔ２が経過した第３時点ｔ３において、第１駆動回路１７にＭＯＳＦＥＴＱ１１をオフ状態にする制御信号を出力する。第１駆動回路１７は、この制御信号に応じて制御信号Ｓａ２として「ＯＮ」信号を出力させたまま、制御信号Ｓａ１として「ＯＦＦ」信号を出力させる。制御部１１は、操作受付部２０から入力される調光レベル（つまり、負荷３への供給電力）に応じて、導通期間Ｔ２の長さを決定する。これにより、第１時点ｔ１から第３時点ｔ３までの導通期間Ｔ２において、第１スイッチＳＷ１がオン状態を継続し、交流電源２から負荷３に電力が供給される。そして、第３時点ｔ３において第１スイッチＳＷ１がオン状態からオフ状態に切り替えられ、交流電源２から負荷３への電力の供給が遮断される。 The control unit 11 outputs a control signal for turning off the MOSFET Q11 to the first drive circuit 17 at the third time point t3 where the conduction period (second period) T2 has elapsed from the first time point t1. The first drive circuit 17 outputs an "OFF" signal as a control signal Sa1 while outputting an "ON" signal as a control signal Sa2 in response to this control signal. The control unit 11 determines the length of the conduction period T2 according to the dimming level (that is, the power supplied to the load 3) input from the operation reception unit 20. As a result, during the conduction period T2 from the first time point t1 to the third time point t3, the first switch SW1 continues to be on, and power is supplied from the AC power supply 2 to the load 3. Then, at the third time point t3, the first switch SW1 is switched from the on state to the off state, and the power supply from the AC power supply 2 to the load 3 is cut off.
　ここで、第３時点ｔ３よりも前の第２時点ｔ２において、制御部１１は、第２駆動回路１８に第２スイッチＳＷ２をオン状態にする制御信号を出力する。第２駆動回路１８は、この制御信号に応じて制御信号Ｓｂ１，Ｓｂ２として「ＯＮ」信号を出力する。これにより、２個のＭＯＳＦＥＴＱ２１，Ｑ２２がいずれもオンになり、第２スイッチＳＷ２がオン状態になる。つまり、制御部１１は、第１スイッチＳＷ１をオン状態からオフ状態に切り替える切替タイミング（第３時点ｔ３）では、第２スイッチＳＷ２をオン状態に制御しており、第２スイッチＳＷ２がオン状態となっている状態で、第１スイッチＳＷ１がオン状態からオフ状態に切り替えられる。したがって、切替タイミング（第３時点ｔ３）において系統のインダクタンスに起因して発生する逆起電圧を容量素子１２で吸収することができる。また、逆起電圧を容量素子１２で吸収することで、第１スイッチＳＷ１の高速スイッチングが可能になり、第１スイッチＳＷ１でのスイッチング損失を低減できる。 Here, at the second time point t2 before the third time point t3, the control unit 11 outputs a control signal for turning on the second switch SW2 to the second drive circuit 18. The second drive circuit 18 outputs an "ON" signal as control signals Sb1 and Sb2 in response to this control signal. As a result, both of the two MOSFETs Q21 and Q22 are turned on, and the second switch SW2 is turned on. That is, the control unit 11 controls the second switch SW2 to the on state at the switching timing (third time point t3) for switching the first switch SW1 from the on state to the off state, and the second switch SW2 is in the on state. In this state, the first switch SW1 is switched from the on state to the off state. Therefore, the counter electromotive voltage generated due to the inductance of the system at the switching timing (third time point t3) can be absorbed by the capacitive element 12. Further, by absorbing the counter electromotive voltage by the capacitive element 12, high-speed switching of the first switch SW1 becomes possible, and the switching loss in the first switch SW1 can be reduced.
　制御部１１は、第３時点ｔ３において第１スイッチＳＷ１のＭＯＳＦＥＴＱ１１をオフにすると、第３時点ｔ３から所定のサージ吸収期間が経過した第４時点ｔ４において、ＭＯＳＦＥＴＱ２２のみをオンにする制御信号を第２駆動回路１８に出力する。第２駆動回路１８は、この制御信号に応じて制御信号Ｓｂ２として「ＯＮ」信号を出力したまま、制御信号Ｓｂ１として「ＯＦＦ」信号を出力する。これにより、第３時点ｔ３から交流電圧Ｖａｃの正極性の半周期が終わるまで、ＭＯＳＦＥＴＱ２１はオフ状態に制御され、第２スイッチＳＷ２がオフになる。つまり、制御部１１は、切替タイミング（第３時点ｔ３）から所定時間（サージ吸収期間）が経過すると、第２スイッチＳＷ２をオン状態からオフ状態に切り替える。サージ吸収期間は、切替タイミング（第３時点ｔ３）において系統のインダクタンス等に起因して逆起電圧が発生すると想定される期間よりも長い期間に設定されているのが好ましい。したがって、サージ吸収期間の経過後は、交流電源２から容量素子１２に電流が流れる電流経路ＲＴ１を遮断することで、第１スイッチＳＷ１のオフ時に容量素子１２を介して負荷３に流れる電流を抑制でき、負荷３の調光特性を改善できる。また、第４時点ｔ４において、ＭＯＳＦＥＴＱ２２がオン状態に維持されたまま、ＭＯＳＦＥＴＱ２１がオフ状態に制御されると、容量素子１２に蓄えられた電荷は、ＭＯＳＦＥＴＱ２１のボディダイオードＤ２１とＭＯＳＦＥＴＱ２２とを介して交流電源２に放電される。 When the MOSFET Q11 of the first switch SW1 is turned off at the third time point t3, the control unit 11 sends a control signal for turning on only the MOSFET Q22 at the fourth time point t4 where a predetermined surge absorption period has elapsed from the third time point t3. 2 Output to the drive circuit 18. The second drive circuit 18 outputs an "OFF" signal as a control signal Sb1 while outputting an "ON" signal as a control signal Sb2 in response to this control signal. As a result, the MOSFET Q21 is controlled to the off state and the second switch SW2 is turned off from the third time point t3 until the end of the positive half cycle of the AC voltage Vac. That is, the control unit 11 switches the second switch SW2 from the on state to the off state when a predetermined time (surge absorption period) elapses from the switching timing (third time point t3). The surge absorption period is preferably set to a period longer than the period in which the counter electromotive voltage is expected to be generated due to the inductance of the system or the like at the switching timing (third time point t3). Therefore, after the surge absorption period has elapsed, the current path RT1 in which the current flows from the AC power supply 2 to the capacitance element 12 is cut off to suppress the current flowing through the capacitance element 12 when the first switch SW1 is turned off. The dimming characteristic of the load 3 can be improved. Further, at the fourth time point t4, when the MOSFET Q21 is controlled to the off state while the MOSFET Q22 is maintained in the on state, the electric charge stored in the capacitive element 12 is alternating current via the body diode D21 of the MOSFET Q21 and the MOSFET Q22. It is discharged to the power supply 2.
　その後、制御部１１は、第３時点ｔ３から所定の放電期間Ｔ１０が経過した第５時点ｔ５において、ＭＯＳＦＥＴＱ２２をオフ状態にする制御信号を第２駆動回路１８に出力する。第２駆動回路１８は、この制御信号に応じて制御信号Ｓｂ１，Ｓｂ２として「ＯＦＦ」信号を出力し、ＭＯＳＦＥＴＱ２１，Ｑ２２を共にオフ状態とすることで、容量素子１２からの放電経路を遮断する。ここにおいて、放電期間Ｔ１０は、容量素子１２に蓄えられた電荷の放電に要する時間よりも長い期間に設定されているのが好ましい。 After that, the control unit 11 outputs a control signal for turning off the MOSFET Q22 to the second drive circuit 18 at the fifth time point t5 when a predetermined discharge period T10 has elapsed from the third time point t3. The second drive circuit 18 outputs an “OFF” signal as control signals Sb1 and Sb2 in response to this control signal, and turns off the MOSFETs Q21 and Q22 together to cut off the discharge path from the capacitive element 12. Here, the discharge period T10 is preferably set to a period longer than the time required for discharging the electric charge stored in the capacitive element 12.
　さらに、制御部１１は、交流電圧Ｖａｃの正極性の半周期の終点（ゼロクロス点）ｔ７よりも一定時間（例えば３００〔μｓ〕）だけ手前の第６時点ｔ６になると、ＭＯＳＦＥＴＱ１２をオフにする制御信号を第１駆動回路１７に出力する。第１駆動回路１７は、この制御信号に応じて制御信号Ｓａ１，Ｓａ２として「ＯＦＦ」信号を出力する。ここで、第３時点ｔ３から第６時点ｔ６までの期間を第三の期間Ｔ３といい、第６時点ｔ６から正極性の半周期の終点（ゼロクロス点）ｔ７までの期間を第四の期間Ｔ４という。第四の期間Ｔ４には、２個のＭＯＳＦＥＴＱ１１，Ｑ１２がいずれもオフになり、第１スイッチＳＷ１がオフ状態となる。 Further, the control unit 11 controls to turn off the MOSFET Q12 at the sixth time point t6, which is a certain time (for example, 300 [μs]) before the end point (zero cross point) t7 of the positive electrode property of the AC voltage Vac. The signal is output to the first drive circuit 17. The first drive circuit 17 outputs an "OFF" signal as control signals Sa1 and Sa2 in response to this control signal. Here, the period from the third time point t3 to the sixth time point t6 is referred to as the third time point T3, and the period from the sixth time point t6 to the end point (zero cross point) t7 of the positive half cycle is the fourth period T4. That is. In the fourth period T4, both of the two MOSFETs Q11 and Q12 are turned off, and the first switch SW1 is turned off.
　また、交流電圧Ｖａｃが負極性の半周期における負荷制御装置１の動作は、正極性の半周期と基本的に同様の動作となる。 Further, the operation of the load control device 1 in the half cycle in which the AC voltage Vac is the negative electrode is basically the same as the operation in the half cycle in which the AC voltage Vac is the positive electrode.
　負極性の半周期において、交流電圧Ｖａｃが負極性の規定値「－Ｖｚｃ」に達すると、ゼロクロス検出部１６が検出信号ＺＣ２を出力する。本実施形態では、負極性の半周期の始点ｔ０（ｔ７）から検出信号ＺＣ２の発生時点である第１時点ｔ１までの期間を第一の期間Ｔ１とする。また、第３時点ｔ３は、第１時点ｔ１から調光レベルに応じた長さの導通期間が経過した時点であり、第６時点ｔ６は、負極性の半周期の終点ｔ７（ｔ０）よりも一定時間（例えば３００〔μｓ〕）だけ手前の時間である。負極性の半周期においても、第１スイッチＳＷ１がオン状態からオフ状態に切り替わる切替タイミング（第３時点ｔ３）よりも前の第２時点ｔ２において第２スイッチＳＷ２がオン状態になり、交流電源２から容量素子１２に電流が流れる電流経路ＲＴ２が形成される。したがって、切替タイミング（第３時点ｔ３）において系統のインダクタンス等に起因して発生する逆起電圧を容量素子１２で吸収できる。また、第２スイッチＳＷ２は、交流電圧Ｖａｃの負極性の半周期の始点から第２時点ｔ２までの期間、及び、第４時点ｔ４から負極性の半周期の終点ｔ７までの期間にはオフ状態になり、交流電源２から容量素子１２への電流経路が遮断されている。したがって、負極性の半周期において第２スイッチＳＷ２が継続してオン状態となっている場合に比べて、第１スイッチＳＷ１のオフ時に容量素子１２を介して負荷３に流れる電流を抑制でき、負荷３の調光性能の悪化を抑制できる。 When the AC voltage Vac reaches the specified value "-Vzc" of the negative electrode property in the negative electrode property half cycle, the zero cross detection unit 16 outputs the detection signal ZC2. In the present embodiment, the period from the start point t0 (t7) of the negative electrode half cycle to the first time point t1 which is the time point of generation of the detection signal ZC2 is defined as the first period T1. Further, the third time point t3 is the time point when the conduction period having a length corresponding to the dimming level has elapsed from the first time point t1, and the sixth time point t6 is more than the end point t7 (t0) of the negative half cycle. This is the time before a certain period of time (for example, 300 [μs]). Even in the negative electrode half cycle, the second switch SW2 is turned on at the second time point t2 before the switching timing (third time point t3) in which the first switch SW1 is switched from the on state to the off state, and the AC power supply 2 is used. A current path RT2 through which a current flows is formed in the capacitive element 12. Therefore, the capacitive element 12 can absorb the counter electromotive voltage generated due to the inductance of the system or the like at the switching timing (third time point t3). Further, the second switch SW2 is in the off state during the period from the start point of the negative half cycle of the AC voltage Vac to the second time point t2 and the period from the fourth time point t4 to the end point t7 of the negative electrode half cycle. The current path from the AC power supply 2 to the capacitive element 12 is cut off. Therefore, as compared with the case where the second switch SW2 is continuously turned on in the negative electrode half cycle, the current flowing through the capacitance element 12 when the first switch SW1 is turned off can be suppressed, and the load can be suppressed. It is possible to suppress the deterioration of the dimming performance of 3.
　本実施形態の負荷制御装置１は、以上説明した正極性の半周期の動作と負極性の半周期の動作とを交流電圧Ｖａｃの半周期ごとに交互に繰り返すことで、負荷３の調光を行う。なお、正極性の規定値「Ｖｚｃ」及び負極性の規定値「－Ｖｚｃ」が固定値であれば、半周期の始点ｔ０から第１時点（検出信号ＺＣ１又はＺＣ２の発生時点）ｔ１までの時間は、略固定長の時間になる。 The load control device 1 of the present embodiment alternately repeats the positive half-cycle operation and the negative half-cycle operation described above every half cycle of the AC voltage Vac to adjust the dimming of the load 3. conduct. If the specified value "Vzc" for the positive electrode property and the specified value "-Vzc" for the negative electrode property are fixed values, the time from the start point t0 of the half cycle to the first time point (time point when the detection signal ZC1 or ZC2 is generated) t1. Is a time of approximately fixed length.
　そのため、半周期の始点ｔ０から切替タイミング（第３時点ｔ３）までの時間、つまり第一の期間Ｔ１と第二の期間Ｔ２とを合計した時間である「導通期間」は、調光レベルに応じて長さが変化することになる。言い換えれば、導通期間は可変長の時間であって、交流電圧Ｖａｃに対する切替タイミング（第３時点ｔ３）の位相は調光レベルに応じて変化する。すなわち、負荷３の光出力を小さくする場合には導通期間は短く、負荷３の光出力を大きくする場合には導通期間は長く規定される。そのため、負荷制御装置１は、操作受付部２０が受け付ける調光レベルに応じて、負荷３の光出力の大きさを変えることが可能である。 Therefore, the "conduction period", which is the time from the start point t0 of the half cycle to the switching timing (third time point t3), that is, the total time of the first period T1 and the second period T2, depends on the dimming level. The length will change. In other words, the conduction period is a variable length time, and the phase of the switching timing (third time point t3) with respect to the AC voltage Vac changes according to the dimming level. That is, when the optical output of the load 3 is reduced, the conduction period is short, and when the optical output of the load 3 is increased, the conduction period is long. Therefore, the load control device 1 can change the magnitude of the light output of the load 3 according to the dimming level received by the operation reception unit 20.
　（３）変形例
　実施形態１は、本開示の様々な実施形態の一つに過ぎない。実施形態１は、本開示の目的を達成できれば、設計等に応じて種々の変更が可能である。例えば、図１に示した具体的な回路は、本開示の負荷制御装置１の一例に過ぎず、設計等に応じて種々の変更が可能である。本開示において説明する各図は、模式的な図であり、各図中の各構成要素の大きさ及び厚さそれぞれの比が、必ずしも実際の寸法比を反映しているとは限らない。また、実施形態１に係る負荷制御装置１の制御部１１と同等の機能は、制御方法、（コンピュータ）プログラム、又はプログラムを記録した非一時的記録媒体等で具現化されてもよい。 (3) Modification Example 1 is only one of various embodiments of the present disclosure. The first embodiment can be changed in various ways depending on the design and the like as long as the object of the present disclosure can be achieved. For example, the specific circuit shown in FIG. 1 is only an example of the load control device 1 of the present disclosure, and various changes can be made depending on the design and the like. Each figure described in the present disclosure is a schematic view, and the ratio of the size and the thickness of each component in each figure does not necessarily reflect the actual dimensional ratio. Further, the function equivalent to that of the control unit 11 of the load control device 1 according to the first embodiment may be embodied by a control method, a (computer) program, a non-temporary recording medium on which the program is recorded, or the like.
　以下、実施形態１の変形例を列挙する。以下に説明する変形例は、適宜組み合わせて適用可能である。 Hereinafter, modified examples of the first embodiment are listed. The modifications described below can be applied in combination as appropriate.
　（３．１）変形例１
　実施形態１の変形例１に係る負荷制御装置１の概略的な回路図を図３に示す。変形例１の負荷制御装置１は、ＭＯＳＦＥＴＱ２１，Ｑ２２の接続点Ｐ２を電源部１９の基準電位に接続し、容量素子１２が、第１容量素子１２１と、第２容量素子１２２とを含む点で上記の実施形態１と相違する。第１容量素子１２１は、接続端子ＴＡ１とＭＯＳＦＥＴＱ２１との間に接続され、第２容量素子１２２は接続端子ＴＡ２とＭＯＳＦＥＴＱ２２との間に接続されている。変形例１では、ＭＯＳＦＥＴＱ１１，Ｑ１２の接続点Ｐ１と、ＭＯＳＦＥＴＱ２１，Ｑ２２の接続点Ｐ２とが電気的に接続されている。以下、実施形態１と同様の構成については、共通の符号を付して適宜説明を省略する。 (3.1) Modification 1
FIG. 3 shows a schematic circuit diagram of the load control device 1 according to the first modification of the first embodiment. In the load control device 1 of the first modification, the connection point P2 of the MOSFETs Q21 and Q22 is connected to the reference potential of the power supply unit 19, and the capacitive element 12 includes the first capacitive element 121 and the second capacitive element 122. It differs from the above-mentioned first embodiment. The first capacitive element 121 is connected between the connection terminal TA1 and the MOSFET Q21, and the second capacitive element 122 is connected between the connection terminal TA2 and the MOSFET Q22. In the first modification, the connection point P1 of the MOSFETs Q11 and Q12 and the connection point P2 of the MOSFETs Q21 and Q22 are electrically connected. Hereinafter, the same configurations as those in the first embodiment will be designated by a common reference numeral and description thereof will be omitted as appropriate.
　制御部１１は、第１スイッチＳＷ１を逆位相制御しており、交流電圧Ｖａｃの各半周期において第１スイッチＳＷ１がオン状態からオフ状態に切り替わる切替タイミングでは、第２スイッチＳＷ２をオン状態に制御している。これにより、切替タイミングにおいて系統のインダクタンス等に起因して発生する逆起電圧を第１容量素子１２１及び第２容量素子１２２で吸収することができる。また、切替タイミングから所定時間が経過すると、制御部１１は、ＭＯＳＦＥＴＱ２１，Ｑ２２を共にオフ状態に制御しており、第１容量素子１２１又は第２容量素子１２２に蓄積された電荷は、ＭＯＳＦＥＴＱ２１，Ｑ２２のボディダイオードＤ２１，Ｄ２２を通り、電源部１９の基準電位を介して放電される。 The control unit 11 controls the first switch SW1 in anti-phase control, and controls the second switch SW2 to the on state at the switching timing when the first switch SW1 switches from the on state to the off state in each half cycle of the AC voltage Vac. is doing. As a result, the counter electromotive voltage generated due to the inductance of the system or the like at the switching timing can be absorbed by the first capacitance element 121 and the second capacitance element 122. Further, when a predetermined time elapses from the switching timing, the control unit 11 controls both the MOSFETs Q21 and Q22 to the off state, and the electric charge accumulated in the first capacitance element 121 or the second capacitance element 122 is the MOSFETs Q21 and Q22. It is discharged through the body diodes D21 and D22 of the above and through the reference potential of the power supply unit 19.
　なお、変形例１では、第１容量素子１２１及び第２容量素子１２２がコンデンサで構成されているが、電気二重層コンデンサ、又は二次電池などでもよい。また、第１容量素子１２１及び第２容量素子１２２の各々は１つのコンデンサで構成されるものに限定されず、直列又は並列に接続された複数のコンデンサで構成されてもよい。 In the first modification, the first capacitance element 121 and the second capacitance element 122 are composed of a capacitor, but an electric double layer capacitor, a secondary battery, or the like may be used. Further, each of the first capacitor element 121 and the second capacitor element 122 is not limited to one composed of one capacitor, and may be composed of a plurality of capacitors connected in series or in parallel.
　（３．２）その他の変形例
　本開示における負荷制御装置１は、制御部１１等にコンピュータシステムを含んでいる。コンピュータシステムは、ハードウェアとしてのプロセッサ及びメモリを主構成とする。コンピュータシステムのメモリに記録されたプログラムをプロセッサが実行することによって、本開示における負荷制御装置１としての機能が実現される。プログラムは、コンピュータシステムのメモリに予め記録されてもよく、電気通信回線を通じて提供されてもよく、コンピュータシステムで読み取り可能なメモリカード、光学ディスク、ハードディスクドライブ等の非一時的記録媒体に記録されて提供されてもよい。コンピュータシステムのプロセッサは、半導体集積回路（ＩＣ）又は大規模集積回路（ＬＳＩ）を含む１ないし複数の電子回路で構成される。ここでいうＩＣ又はＬＳＩ等の集積回路は、集積の度合いによって呼び方が異なっており、システムＬＳＩ、ＶＬＳＩ（Very Large Scale Integration）、又はＵＬＳＩ（Ultra Large Scale Integration）と呼ばれる集積回路を含む。さらに、ＬＳＩの製造後にプログラムされる、ＦＰＧＡ（Field-Programmable Gate Array）、又はＬＳＩ内部の接合関係の再構成若しくはＬＳＩ内部の回路区画の再構成が可能な論理デバイスについても、プロセッサとして採用することができる。複数の電子回路は、１つのチップに集約されていてもよいし、複数のチップに分散して設けられていてもよい。複数のチップは、１つの装置に集約されていてもよいし、複数の装置に分散して設けられていてもよい。ここでいうコンピュータシステムは、１以上のプロセッサ及び１以上のメモリを有するマイクロコントローラを含む。したがって、マイクロコントローラについても、半導体集積回路又は大規模集積回路を含む１ないし複数の電子回路で構成される。 (3.2) Other Modifications The load control device 1 in the present disclosure includes a computer system in the control unit 11 and the like. The computer system mainly consists of a processor and a memory as hardware. When the processor executes the program recorded in the memory of the computer system, the function as the load control device 1 in the present disclosure is realized. The program may be pre-recorded in the memory of the computer system, may be provided through a telecommunications line, and may be recorded on a non-temporary recording medium such as a memory card, optical disk, hard disk drive, etc. that can be read by the computer system. May be provided. The processor of a computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large scale integrated circuit (LSI). The integrated circuit such as IC or LSI referred to here has a different name depending on the degree of integration, and includes an integrated circuit called a system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). Further, an FPGA (Field-Programmable Gate Array) programmed after the LSI is manufactured, or a logical device capable of reconfiguring the junction relationship inside the LSI or reconfiguring the circuit partition inside the LSI should also be adopted as a processor. Can be done. A plurality of electronic circuits may be integrated on one chip, or may be distributed on a plurality of chips. A plurality of chips may be integrated in one device, or may be distributed in a plurality of devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, the microprocessor is also composed of one or a plurality of electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.
　また、負荷制御装置１の少なくとも一部の機能が、１つの筐体内に集約されていることは負荷制御装置１に必須の構成ではなく、負荷制御装置１の構成要素は、複数の筐体に分散して設けられていてもよい。例えば、操作受付部２０が備えるタッチパネルは、制御部１１とは別の筐体に設けられていてもよい。また、制御部１１等の少なくとも一部の機能は、例えば、サーバ又はクラウド（クラウドコンピューティング）等によって実現されてもよい。 Further, it is not an essential configuration for the load control device 1 that at least a part of the functions of the load control device 1 are integrated in one housing, and the components of the load control device 1 are integrated in a plurality of housings. It may be provided in a distributed manner. For example, the touch panel included in the operation reception unit 20 may be provided in a housing different from the control unit 11. Further, at least a part of the functions of the control unit 11 and the like may be realized by, for example, a server or a cloud (cloud computing).
　実施形態１では、制御部１１は、切替タイミング（第３時点ｔ３）よりも前に第２スイッチＳＷ２をオフ状態からオン状態に制御しているが、上記の切替タイミングで、第２スイッチＳＷ２をオフ状態からオン状態に制御してもよい。つまり、制御部１１は、第１スイッチＳＷ１をオフ状態からオン状態に制御するのと同じタイミングで、第２スイッチＳＷ２をオフ状態からオン状態に制御してもよく、第１スイッチＳＷ１のオフ時に発生する逆起電圧を容量素子１２で抑制することができる。 In the first embodiment, the control unit 11 controls the second switch SW2 from the off state to the on state before the switching timing (third time point t3), but at the above switching timing, the second switch SW2 is turned on. It may be controlled from the off state to the on state. That is, the control unit 11 may control the second switch SW2 from the off state to the on state at the same timing as controlling the first switch SW1 from the off state to the on state, and when the first switch SW1 is off. The generated counter electromotive voltage can be suppressed by the capacitive element 12.
　実施形態１では、制御部１１は、第１スイッチＳＷ１を逆位相制御しているが、第１スイッチＳＷ１を正位相制御してもよい。つまり、制御部１１は、交流電圧Ｖａｃの半周期の始点から遮断期間が経過するまで第１スイッチＳＷ１をオフ状態に制御し、遮断期間の経過後に第１スイッチＳＷ１をオン状態に制御してもよい。正位相制御においても、制御部１１が、第１スイッチＳＷ１の切替タイミングに第２スイッチＳＷ２をオン状態に制御しているので、切替タイミングで発生する逆起電圧を低減できる。正位相制御の場合、制御部１１は、交流電圧Ｖａｃの各半周期の途中で第１スイッチＳＷ１がオフからオンに切り替わる切替タイミングに、第２スイッチＳＷ２をオン状態に制御すればよい。 In the first embodiment, the control unit 11 controls the first switch SW1 in the opposite phase, but the first switch SW1 may be controlled in the positive phase. That is, even if the control unit 11 controls the first switch SW1 to the off state from the start point of the half cycle of the AC voltage Vac until the cutoff period elapses, and controls the first switch SW1 to the on state after the cutoff period elapses. good. Even in the positive phase control, since the control unit 11 controls the second switch SW2 to be in the ON state at the switching timing of the first switch SW1, the counter electromotive voltage generated at the switching timing can be reduced. In the case of positive phase control, the control unit 11 may control the second switch SW2 to the on state at the switching timing when the first switch SW1 switches from off to on in the middle of each half cycle of the AC voltage Vac.
　また、実施形態１では、交流電源２は、単相１００〔Ｖ〕、６０〔Ｈｚ〕の商用電源であるが、単相１００〔Ｖ〕、５０〔Ｈｚ〕の商用電源であってもよい。また、交流電源２の電圧値は、１００〔Ｖ〕に限らない。 Further, in the first embodiment, the AC power supply 2 is a single-phase 100 [V], 60 [Hz] commercial power supply, but may be a single-phase 100 [V], 50 [Hz] commercial power supply. Further, the voltage value of the AC power supply 2 is not limited to 100 [V].
　また、実施形態１では、負荷制御装置１は片切スイッチであるが、他の構成であってもよい。例えば、負荷制御装置１は、３本の配線を接続可能な、いわゆる三路スイッチであってもよい。また、負荷制御装置１は、４本の配線を接続可能な、いわゆる四路スイッチであってもよい。負荷制御装置１が三路スイッチを構成する場合、２つの負荷制御装置１を組み合わせることにより、負荷３への通電状態を、例えば、建物における階段の上階部分と下階部分との２箇所で切り替えることが可能である。また、実施形態１では、負荷制御装置１は、Ｌ相及びＮ相の２本の電線が接続される２線式のスイッチであるが、負荷制御装置１は、Ｌ相と、負荷と、電源及び負荷に共通のＮ相との３本の電線が接続される３線式のスイッチであってもよい。 Further, in the first embodiment, the load control device 1 is a one-sided switch, but may have another configuration. For example, the load control device 1 may be a so-called three-way switch capable of connecting three wires. Further, the load control device 1 may be a so-called four-way switch capable of connecting four wires. When the load control device 1 constitutes a three-way switch, by combining the two load control devices 1, the energization state of the load 3 can be set at two places, for example, the upper floor part and the lower floor part of the stairs in the building. It is possible to switch. Further, in the first embodiment, the load control device 1 is a two-wire switch to which two electric wires of L phase and N phase are connected, but the load control device 1 is an L phase, a load, and a power supply. And may be a three-wire switch to which three electric wires are connected to the N phase common to the load.
　実施形態１では、ゼロクロス検出部１５は、接続端子ＴＡ１－グランド間電圧が基準値以上になることをもって、スイッチ間電圧が負極性から正極性へ切り替わる際のゼロクロスを検出する構成であるが、逆であってもよい。つまり、ゼロクロス検出部１５は、接続端子ＴＡ１－グランド間電圧が基準値未満になることをもって、スイッチ間電圧が正極性から負極性へ切り替わる際のゼロクロスを検出する構成であってもよい。同様に、ゼロクロス検出部１６は、端子ＴＡ２－グランド間電圧が基準値以上になることをもって、スイッチ間電圧が正極性から負極性へ切り替わる際のゼロクロスを検出する構成であるが、逆であってもよい。つまり、ゼロクロス検出部１６は、端子ＴＡ２－グランド間電圧が基準値未満になることをもって、スイッチ間電圧が負極性から正極性へ切り替わる際のゼロクロスを検出する構成であってもよい。 In the first embodiment, the zero cross detection unit 15 is configured to detect the zero cross when the voltage between the switches switches from the negative electrode property to the positive electrode property when the voltage between the connection terminals TA1-ground becomes equal to or higher than the reference value. May be. That is, the zero cross detection unit 15 may be configured to detect the zero cross when the voltage between the switches switches from the positive electrode property to the negative electrode property when the voltage between the connection terminals TA1-ground becomes less than the reference value. Similarly, the zero-cross detection unit 16 is configured to detect zero-cross when the switch-to-switch voltage switches from positive to negative when the voltage between terminals TA2-ground becomes equal to or higher than the reference value, but the opposite is true. May be good. That is, the zero cross detection unit 16 may be configured to detect the zero cross when the voltage between the switches switches from the negative electrode property to the positive electrode property when the voltage between the terminals TA2-ground becomes less than the reference value.
　また、負荷３は、ＬＥＤからなる光源を備える照明装置に限らず、ＬＥＤ以外の光源を備える照明装置であってもよい。さらに、負荷３は、照明装置に限らず、例えば、換気扇、表示装置、電動シャッタ、空調機器又は防犯機器等の機器（装置、システム及び設備を含む）であってもよい。また、負荷３は、１台の機器に限らず、電気的に直列又は並列に接続された複数台の機器であってもよい。 Further, the load 3 is not limited to a lighting device including a light source made of an LED, and may be a lighting device including a light source other than the LED. Further, the load 3 is not limited to the lighting device, and may be, for example, a device (including a device, a system, and a device) such as a ventilation fan, a display device, an electric shutter, an air conditioning device, or a security device. Further, the load 3 is not limited to one device, and may be a plurality of devices electrically connected in series or in parallel.
　また、負荷制御装置１は、子機を接続するための操作端子を更に備えていてもよい。子機は、例えば、押釦スイッチ等の接点部を備えており、接点部のオン／オフが負荷制御装置１にて検知される。この場合、負荷制御装置１は、子機の動作（接点部のオン／オフ）に応じて、第１スイッチＳＷ１の動作状態を切り替えるように第１スイッチＳＷ１を制御する。すなわち、子機において、例えば、押釦スイッチが押されて接点部がオンする度に、第１スイッチＳＷ１のオン状態と、オフ状態とが切り替わるように、負荷制御装置１が動作する。要するに、負荷制御装置１では、第１スイッチＳＷ１の制御は、操作受付部２０の出力に応じて行われるのみならず、子機の動作に応じて行われてもよい。したがって、負荷制御装置１と子機とが、例えば、建物における階段の上階部分と下階部分との２箇所に分かれて設置されることにより、負荷３への通電状態を、２箇所で切り替えることが可能である。 Further, the load control device 1 may further include an operation terminal for connecting a slave unit. The slave unit is provided with a contact portion such as a push button switch, and on / off of the contact portion is detected by the load control device 1. In this case, the load control device 1 controls the first switch SW1 so as to switch the operating state of the first switch SW1 according to the operation of the slave unit (on / off of the contact portion). That is, in the slave unit, for example, the load control device 1 operates so that the on state and the off state of the first switch SW1 are switched each time the push button switch is pressed and the contact portion is turned on. In short, in the load control device 1, the control of the first switch SW1 may be performed not only according to the output of the operation receiving unit 20 but also according to the operation of the slave unit. Therefore, the load control device 1 and the slave unit are installed separately in, for example, the upper floor portion and the lower floor portion of the stairs in the building, so that the energization state of the load 3 is switched at the two locations. It is possible.
　また、負荷制御装置１は、操作受付部２０に加えて又は代えて、センサ回路又はタイマ回路等を備えていてもよい。センサ回路は、一例として、人が存在するか否かを検知する人感センサ及び／又は明るさセンサ等を備える。負荷制御装置１は、これらのセンサ回路又はタイマ回路等の出力に基づいて第１スイッチＳＷ１の制御を行うことが可能である。 Further, the load control device 1 may include a sensor circuit, a timer circuit, or the like in addition to or in place of the operation reception unit 20. As an example, the sensor circuit includes a motion sensor and / or a brightness sensor that detects whether or not a person is present. The load control device 1 can control the first switch SW1 based on the outputs of these sensor circuits, timer circuits, and the like.
　また、上記実施形態では、第１スイッチＳＷ１は、２つのＭＯＳＦＥＴＱ１１，Ｑ１２を有しているが、ＭＯＳＦＥＴに限らず、その他の半導体スイッチであってもよい。例えば、第１スイッチＳＷ１は、３端子の双方向サイリスタ（トライアック）にて実現されてもよいし、ＧａＮ（窒化ガリウム）等のワイドバンドギャップの半導体材料を用いたダブルゲート（デュアルゲート）構造の半導体素子を用いて実現されてもよい。 Further, in the above embodiment, the first switch SW1 has two MOSFETs Q11 and Q12, but is not limited to the MOSFET and may be another semiconductor switch. For example, the first switch SW1 may be realized by a three-terminal bidirectional thyristor (triac), or has a double gate (dual gate) structure using a wide bandgap semiconductor material such as GaN (gallium nitride). It may be realized by using a semiconductor element.
　（実施形態２）
　本実施形態に係る負荷制御装置１Ａでは、図４に示すように、整流回路ＤＢ１の出力端子間に、第２スイッチＳＷ２１及び容量素子１２の直列回路が接続されている点で実施形態１に係る負荷制御装置１と相違する。つまり、実施形態２の負荷制御装置１Ａは、一対の接続端子ＴＡ１，ＴＡ２を介して入力される交流電圧Ｖａｃを整流する整流回路ＤＢ１を備えている。そして、整流回路ＤＢ１の出力端子間に、第２スイッチＳＷ２１及び容量素子１２の直列回路が接続されている。以下、実施形態１と同様の構成については、共通の符号を付して適宜説明を省略する。 (Embodiment 2)
In the load control device 1A according to the present embodiment, as shown in FIG. 4, a series circuit of the second switch SW21 and the capacitance element 12 is connected between the output terminals of the rectifier circuit DB1 according to the first embodiment. It is different from the load control device 1. That is, the load control device 1A of the second embodiment includes a rectifier circuit DB1 that rectifies the AC voltage Vac input via the pair of connection terminals TA1 and TA2. Then, a series circuit of the second switch SW21 and the capacitance element 12 is connected between the output terminals of the rectifier circuit DB1. Hereinafter, the same configurations as those in the first embodiment will be designated by a common reference numeral and description thereof will be omitted as appropriate.
　実施形態２の負荷制御装置１Ａでは、第２スイッチＳＷ２１は、接続端子ＴＡ１にダイオードＤ１を介して電気的に接続され、接続端子ＴＡ２にダイオードＤ２を介して電気的に接続されている。つまり、第２スイッチＳＷ２１は、交流電源２から接続端子ＴＡ１又はＴＡ２を介して容量素子１２に電流が流れる電流経路ＲＴ３に挿入されている。第２スイッチＳＷ２１がオン状態に制御されると、交流電源２から容量素子１２に電流が流れる状態となり、第２スイッチＳＷ２１がオフ状態に制御されると、交流電源２から容量素子１２に流れる電流が遮断される。 In the load control device 1A of the second embodiment, the second switch SW21 is electrically connected to the connection terminal TA1 via the diode D1 and electrically connected to the connection terminal TA2 via the diode D2. That is, the second switch SW21 is inserted into the current path RT3 in which a current flows from the AC power supply 2 to the capacitance element 12 via the connection terminal TA1 or TA2. When the second switch SW21 is controlled to the ON state, a current flows from the AC power supply 2 to the capacitance element 12, and when the second switch SW21 is controlled to the OFF state, the current flows from the AC power supply 2 to the capacitance element 12. Is blocked.
　また、実施形態２の負荷制御装置１Ａは、容量素子１２と並列に接続された、抵抗器Ｒ１（インピーダンス要素）と第３スイッチＳＷ３との直列回路を更に備えている。そして、制御部１１が、第２スイッチＳＷ２１をオフ状態に制御する期間に第３スイッチＳＷ３をオン状態に制御する。なお、制御部１１は、第２スイッチＳＷ２１をオン状態に制御する期間では、第３スイッチＳＷ３をオフ状態に制御する。 Further, the load control device 1A of the second embodiment further includes a series circuit of the resistor R1 (impedance element) and the third switch SW3 connected in parallel with the capacitance element 12. Then, the control unit 11 controls the third switch SW3 to the on state during the period for controlling the second switch SW21 to the off state. The control unit 11 controls the third switch SW3 to the off state during the period for controlling the second switch SW21 to the on state.
　本実施形態では、第３スイッチＳＷ３は、例えばＭＯＳＦＥＴであるが、トランジスタ又はサイリスタなどの半導体スイッチにて実現されてもよいし、メカニカルリレーの接点等で実現されてもよい。また、本実施形態ではインピーダンス要素が抵抗器Ｒ１で実現されているが、インピーダンス要素は制御部１１に限定されず適宜変更が可能である。また、容量素子１２に蓄えられた電荷をシリーズレギュレータなどの電源回路に供給し、制御部１１等の回路に供給する電力に利用してもよい。 In the present embodiment, the third switch SW3 is, for example, a MOSFET, but may be realized by a semiconductor switch such as a transistor or a thyristor, or may be realized by a contact of a mechanical relay or the like. Further, in the present embodiment, the impedance element is realized by the resistor R1, but the impedance element is not limited to the control unit 11 and can be changed as appropriate. Further, the electric charge stored in the capacitive element 12 may be supplied to a power supply circuit such as a series regulator and used as electric power to be supplied to a circuit such as a control unit 11.
　実施形態２の負荷制御装置１Ａでは、例えば、第１スイッチＳＷ１を逆位相制御しており、第１スイッチＳＷ１をオン状態からオフ状態に切り変える切替タイミングでは第２スイッチＳＷ２１をオン状態に制御している。これにより、切替タイミングで系統のインダクタンス等に起因して発生する逆起電圧を容量素子１２で吸収することができ、負荷制御装置１Ａで発生するノイズを低減できる。制御部１１は、切替タイミングから所定時間が経過すると第２スイッチＳＷ２１をオン状態からオフ状態に切り替える。そして、制御部１１は、第２スイッチＳＷ２１がオフ状態に制御すると、第３スイッチＳＷ３をオン状態に制御するので、容量素子１２に蓄えられた電荷を、抵抗器Ｒ１を介して放電させることができる。 In the load control device 1A of the second embodiment, for example, the first switch SW1 is controlled in anti-phase, and the second switch SW21 is controlled to be in the on state at the switching timing for switching the first switch SW1 from the on state to the off state. ing. As a result, the counter electromotive voltage generated due to the inductance of the system or the like at the switching timing can be absorbed by the capacitive element 12, and the noise generated by the load control device 1A can be reduced. The control unit 11 switches the second switch SW21 from the on state to the off state when a predetermined time has elapsed from the switching timing. Then, when the second switch SW21 is controlled to the off state, the control unit 11 controls the third switch SW3 to the on state, so that the electric charge stored in the capacitive element 12 can be discharged via the resistor R1. can.
　（まとめ）
　以上説明したように、第１の態様の負荷制御装置（１，１Ａ）は、一対の接続端子（ＴＡ１，ＴＡ２）と、第１スイッチ（ＳＷ１）と、容量素子（１２）と、第２スイッチ（ＳＷ２，ＳＷ２１）と、制御部（１１）と、を備える。一対の接続端子（ＴＡ１，ＴＡ２）には、交流電源（２）及び負荷（３）の直列回路が接続される。第１スイッチ（ＳＷ１）は、一対の接続端子（ＴＡ１，ＴＡ２）の間に接続され、交流電源（２）から負荷（３）への電力の供給を遮断するオフ状態、及び、交流電源（２）から負荷（３）へ電力の供給を行うオン状態のいずれかに切り替えられる。第２スイッチ（ＳＷ２，ＳＷ２１）は電流経路（ＲＴ１～ＲＴ３）に挿入される。電流経路（ＲＴ１～ＲＴ３）は、交流電源（２）から一対の接続端子（ＴＡ１，ＴＡ２）のうちの少なくとも一方を介して容量素子（１２）に電流が流れる経路である。制御部（１１）は、交流電源（２）の交流電圧（Ｖａｃ）の各半周期に、負荷（３）への供給電力に応じて決定した導通期間に第１スイッチ（ＳＷ１）をオン状態に制御し、導通期間以外の遮断期間に第１スイッチ（ＳＷ１）をオフ状態に制御する。制御部（１１）は、交流電圧（Ｖａｃ）の各半周期の途中で第１スイッチ（ＳＷ１）のオン／オフが切り替わる切替タイミングにおいて第２スイッチ（ＳＷ２，ＳＷ２１）をオン状態に制御する。 (summary)
As described above, the load control device (1,1A) of the first aspect includes a pair of connection terminals (TA1, TA2), a first switch (SW1), a capacitive element (12), and a second switch. (SW2, SW21) and a control unit (11) are provided. A series circuit of the AC power supply (2) and the load (3) is connected to the pair of connection terminals (TA1, TA2). The first switch (SW1) is connected between a pair of connection terminals (TA1 and TA2), and is in an off state in which power supply from the AC power supply (2) to the load (3) is cut off, and an AC power supply (2). ) To one of the on states that supply power to the load (3). The second switch (SW2, SW21) is inserted into the current path (RT1 to RT3). The current paths (RT1 to RT3) are paths through which a current flows from the AC power supply (2) to the capacitive element (12) via at least one of the pair of connection terminals (TA1 and TA2). The control unit (11) turns on the first switch (SW1) in each half cycle of the AC voltage (Vac) of the AC power supply (2) during the conduction period determined according to the power supplied to the load (3). It is controlled and the first switch (SW1) is controlled to be in the off state during a cutoff period other than the conduction period. The control unit (11) controls the second switch (SW2, SW21) to be in the ON state at the switching timing in which the first switch (SW1) is switched on / off in the middle of each half cycle of the AC voltage (Vac).
　この態様によれば、ノイズの低減が可能な低損失の負荷制御装置（１，１Ａ）を提供することができる。 According to this aspect, it is possible to provide a low-loss load control device (1,1A) capable of reducing noise.
　第２の態様の負荷制御装置（１，１Ａ）では、第１の態様において、第１スイッチ（ＳＷ１）と並列に、第２スイッチ（ＳＷ２）及び容量素子（１２）の直列回路が接続される。 In the load control device (1, 1A) of the second aspect, in the first aspect, the series circuit of the second switch (SW2) and the capacitive element (12) is connected in parallel with the first switch (SW1). ..
　この態様によれば、ノイズの低減が可能な低損失の負荷制御装置（１，１Ａ）を提供することができる。 According to this aspect, it is possible to provide a low-loss load control device (1,1A) capable of reducing noise.
　第３の態様の負荷制御装置（１Ａ）は、第１の態様において、一対の接続端子（ＴＡ１，ＴＡ２）を介して入力される交流電圧（Ｖａｃ）を整流する整流回路（ＤＢ１）を更に備える。整流回路（ＤＢ１）の出力端子間に、第２スイッチ（ＳＷ２１）及び容量素子（１２）の直列回路が接続される。 The load control device (1A) of the third aspect further includes a rectifier circuit (DB1) for rectifying an AC voltage (Vac) input via a pair of connection terminals (TA1, TA2) in the first aspect. .. A series circuit of the second switch (SW21) and the capacitive element (12) is connected between the output terminals of the rectifier circuit (DB1).
　この態様によれば、ノイズの低減が可能な低損失の負荷制御装置（１Ａ）を提供することができる。 According to this aspect, it is possible to provide a low-loss load control device (1A) capable of reducing noise.
　第４の態様の負荷制御装置（１Ａ）は、第３の態様において、容量素子（１２）と並列に接続された、インピーダンス要素（Ｒ１）と第３スイッチ（ＳＷ３）との直列回路を更に備える。制御部（１１）が、第２スイッチ（ＳＷ２１）をオフ状態に制御する期間に第３スイッチ（ＳＷ３）をオン状態に制御する。 In the third aspect, the load control device (1A) of the fourth aspect further includes a series circuit of the impedance element (R1) and the third switch (SW3) connected in parallel with the capacitive element (12). .. The control unit (11) controls the third switch (SW3) to the on state during the period for controlling the second switch (SW21) to the off state.
　この態様によれば、ノイズの低減が可能な低損失の負荷制御装置（１Ａ）を提供することができる。 According to this aspect, it is possible to provide a low-loss load control device (1A) capable of reducing noise.
　第５の態様の負荷制御装置（１，１Ａ）では、第１～４のいずれかの態様において、制御部（１１）は、交流電圧（Ｖａｃ）の半周期の始点から導通期間が経過するまで第１スイッチ（ＳＷ１）をオン状態に制御し、導通期間の経過後に第１スイッチ（ＳＷ１）をオフ状態に制御する。 In the load control device (1, 1A) of the fifth aspect, in any one of the first to the fourth aspects, the control unit (11) is used from the start point of the half cycle of the AC voltage (Vac) until the conduction period elapses. The first switch (SW1) is controlled to be in the on state, and the first switch (SW1) is controlled to be in the off state after the conduction period has elapsed.
　この態様によれば、ノイズの低減が可能な低損失の負荷制御装置（１，１Ａ）を提供することができる。 According to this aspect, it is possible to provide a low-loss load control device (1,1A) capable of reducing noise.
　第６の態様の負荷制御装置（１，１Ａ）では、第５の態様において、制御部（１１）は、第１スイッチ（ＳＷ１）をオン状態からオフ状態に切り替える切替タイミングでは、第２スイッチ（ＳＷ２，ＳＷ２１）をオン状態に制御している。 In the load control device (1,1A) of the sixth aspect, in the fifth aspect, the control unit (11) has a second switch (11) at the switching timing of switching the first switch (SW1) from the on state to the off state. SW2, SW21) are controlled to be on.
　この態様によれば、ノイズの低減が可能な低損失の負荷制御装置（１，１Ａ）を提供することができる。 According to this aspect, it is possible to provide a low-loss load control device (1,1A) capable of reducing noise.
　第７の態様の負荷制御装置（１，１Ａ）では、第５の態様において、制御部（１１）は、第１スイッチ（ＳＷ１）をオン状態からオフ状態に切り替える切替タイミングで、第２スイッチ（ＳＷ２，ＳＷ２１）をオフ状態からオン状態に制御する。 In the load control device (1,1A) of the seventh aspect, in the fifth aspect, the control unit (11) has a second switch (SW1) at a switching timing of switching the first switch (SW1) from the on state to the off state. SW2, SW21) is controlled from the off state to the on state.
　この態様によれば、ノイズの低減が可能な低損失の負荷制御装置（１，１Ａ）を提供することができる。 According to this aspect, it is possible to provide a low-loss load control device (1,1A) capable of reducing noise.
　第８の態様の負荷制御装置（１，１Ａ）では、第５～７のいずれかの態様において、制御部（１１）は、第１スイッチ（ＳＷ１）をオン状態からオフ状態に切り替える切替タイミングから所定時間が経過すると、第２スイッチ（ＳＷ２，ＳＷ２１）をオン状態からオフ状態に切り替える。 In the load control device (1, 1A) of the eighth aspect, in any one of the fifth to seventh aspects, the control unit (11) starts from the switching timing of switching the first switch (SW1) from the on state to the off state. After a lapse of a predetermined time, the second switch (SW2, SW21) is switched from the on state to the off state.
　この態様によれば、ノイズの低減が可能な低損失の負荷制御装置（１，１Ａ）を提供することができる。 According to this aspect, it is possible to provide a low-loss load control device (1,1A) capable of reducing noise.
　第９の態様の負荷制御装置（１，１Ａ）では、第１～４のいずれかの態様において、制御部（１１）は、交流電圧（Ｖａｃ）の半周期の始点から遮断期間が経過するまで第１スイッチ（ＳＷ１）をオフ状態に制御し、遮断期間の経過後に第１スイッチ（ＳＷ１）をオン状態に制御する。 In the load control device (1, 1A) of the ninth aspect, in any one of the first to the fourth aspects, the control unit (11) is used from the start point of the half cycle of the AC voltage (Vac) until the cutoff period elapses. The first switch (SW1) is controlled to be in the off state, and the first switch (SW1) is controlled to be in the on state after the cutoff period has elapsed.
　この態様によれば、ノイズの低減が可能な低損失の負荷制御装置（１，１Ａ）を提供することができる。 According to this aspect, it is possible to provide a low-loss load control device (1,1A) capable of reducing noise.
　第１０の態様の負荷制御装置（１，１Ａ）では、第１～９のいずれかの態様において、負荷（３）は、調光可能な照明負荷を含む。 In the load control device (1, 1A) of the tenth aspect, in any one of the first to ninth aspects, the load (3) includes a dimmable lighting load.
　この態様によれば、ノイズの低減が可能な低損失の負荷制御装置（１，１Ａ）を提供することができる。 According to this aspect, it is possible to provide a low-loss load control device (1,1A) capable of reducing noise.
　上記態様に限らず、実施形態１又は２に係る負荷制御装置（１，１Ａ）の種々の構成（変形例を含む）は、負荷制御装置（１，１Ａ）の制御方法、（コンピュータ）プログラム、又はプログラムを記録した非一時的記録媒体等で具現化可能である。 Not limited to the above embodiment, various configurations (including modifications) of the load control device (1,1A) according to the first or second embodiment include a control method of the load control device (1,1A), a (computer) program, and the like. Alternatively, it can be embodied in a non-temporary recording medium or the like on which the program is recorded.
　第２～第１０の態様に係る構成については、負荷制御装置（１，１Ａ）に必須の構成ではなく、適宜省略可能である。 The configurations according to the second to tenth aspects are not essential configurations for the load control device (1, 1A) and can be omitted as appropriate.
　１　負荷制御装置
　２　交流電源
　３　負荷
　１２　容量素子
　ＤＢ１　整流回路
　Ｒ１　インピーダンス要素
　ＲＴ１～ＲＴ３　電流経路
　ＳＷ１　第１スイッチ
　ＳＷ２，ＳＷ２１　第２スイッチ
　ＳＷ３　第３スイッチ
　ＴＡ１，ＴＡ２　接続端子
　Ｖａｃ　交流電圧 1 Load control device 2 AC power supply 3 Load 12 Capacitive element DB1 Rectifier circuit R1 Impedance element RT1 to RT3 Current path SW1 1st switch SW2, SW21 2nd switch SW3 3rd switch TA1, TA2 Connection terminal Vac AC voltage

Claims (10)

  1. 　交流電源及び負荷の直列回路が接続される一対の接続端子と、
    　前記一対の接続端子の間に接続され、前記交流電源から前記負荷への電力の供給を遮断するオフ状態、及び、前記交流電源から前記負荷へ電力の供給を行うオン状態のいずれかに切り替えられる第１スイッチと、
    　容量素子と、
    　前記交流電源から前記一対の接続端子のうちの少なくとも一方を介して前記容量素子に電流が流れる電流経路に挿入された第２スイッチと、
    　制御部と、を備え、
    　前記制御部は、前記交流電源の交流電圧の各半周期に、前記負荷への供給電力に応じて決定した導通期間に前記第１スイッチをオン状態に制御し、前記導通期間以外の遮断期間に前記第１スイッチをオフ状態に制御し、
    　前記制御部は、前記交流電圧の各半周期の途中で前記第１スイッチのオン／オフが切り替わる切替タイミングにおいて前記第２スイッチをオン状態に制御する、
    　負荷制御装置。     A pair of connection terminals to which the AC power supply and load series circuit are connected,
    It is connected between the pair of connection terminals and can be switched between an off state in which the supply of power from the AC power supply to the load is cut off and an on state in which power is supplied from the AC power supply to the load. The first switch and
    Capacitive element and
    A second switch inserted into a current path through which a current flows from the AC power supply to the capacitive element via at least one of the pair of connection terminals.
    With a control unit,
    The control unit controls the first switch to be in the ON state during the conduction period determined according to the power supplied to the load in each half cycle of the AC voltage of the AC power supply, and during a cutoff period other than the conduction period. The first switch is controlled to be off, and the first switch is turned off.
    The control unit controls the second switch to be in the on state at the switching timing at which the first switch is switched on / off in the middle of each half cycle of the AC voltage.
    Load control device.
  2. 　前記第１スイッチと並列に、前記第２スイッチ及び前記容量素子の直列回路が接続される、
    　請求項１に記載の負荷制御装置。     A series circuit of the second switch and the capacitive element is connected in parallel with the first switch.
    The load control device according to claim 1.
  3. 　前記一対の接続端子を介して入力される前記交流電圧を整流する整流回路を更に備え、
    　前記整流回路の出力端子間に、前記第２スイッチ及び前記容量素子の直列回路が接続される、
    　請求項１に記載の負荷制御装置。     Further provided with a rectifier circuit for rectifying the AC voltage input via the pair of connection terminals.
    A series circuit of the second switch and the capacitive element is connected between the output terminals of the rectifier circuit.
    The load control device according to claim 1.
  4. 　前記容量素子と並列に接続された、インピーダンス要素と第３スイッチとの直列回路を更に備え、
    　前記制御部が、前記第２スイッチをオフ状態に制御する期間に前記第３スイッチをオン状態に制御する、
    　請求項３に記載の負荷制御装置。     Further, a series circuit of the impedance element and the third switch connected in parallel with the capacitive element is provided.
    The control unit controls the third switch to the on state during the period for controlling the second switch to the off state.
    The load control device according to claim 3.
  5. 　前記制御部は、前記交流電圧の半周期の始点から前記導通期間が経過するまで前記第１スイッチをオン状態に制御し、前記導通期間の経過後に前記第１スイッチをオフ状態に制御する、
    　請求項１～４のいずれか１項に記載の負荷制御装置。     The control unit controls the first switch to be in the on state from the start point of the half cycle of the AC voltage until the conduction period elapses, and controls the first switch to the off state after the elapse of the conduction period.
    The load control device according to any one of claims 1 to 4.
  6. 　前記制御部は、前記第１スイッチをオン状態からオフ状態に切り替える切替タイミングでは、前記第２スイッチをオン状態に制御している、
    　請求項５に記載の負荷制御装置。     The control unit controls the second switch to the on state at the switching timing for switching the first switch from the on state to the off state.
    The load control device according to claim 5.
  7. 　前記制御部は、前記第１スイッチをオン状態からオフ状態に切り替える切替タイミングで、前記第２スイッチをオフ状態からオン状態に制御する、
    　請求項５に記載の負荷制御装置。     The control unit controls the second switch from the off state to the on state at the switching timing of switching the first switch from the on state to the off state.
    The load control device according to claim 5.
  8. 　前記制御部は、前記第１スイッチをオン状態からオフ状態に切り替える切替タイミングから所定時間が経過すると、前記第２スイッチをオン状態からオフ状態に切り替える、
    　請求項５～７のいずれか１項に記載の負荷制御装置。     The control unit switches the second switch from the on state to the off state when a predetermined time elapses from the switching timing for switching the first switch from the on state to the off state.
    The load control device according to any one of claims 5 to 7.
  9. 　前記制御部は、前記交流電圧の半周期の始点から前記遮断期間が経過するまで前記第１スイッチをオフ状態に制御し、前記遮断期間の経過後に前記第１スイッチをオン状態に制御する、
    　請求項１～４のいずれか１項に記載の負荷制御装置。     The control unit controls the first switch to the off state from the start point of the half cycle of the AC voltage until the cutoff period elapses, and controls the first switch to the on state after the cutoff period elapses.
    The load control device according to any one of claims 1 to 4.
  10. 　前記負荷は、調光可能な照明負荷を含む、
    　請求項１～９のいずれか１項に記載の負荷制御装置。     The load includes a dimmable lighting load.
    The load control device according to any one of claims 1 to 9.
PCT/JP2021/028173 2020-08-05 2021-07-29 Load control device WO2022030362A1 (en)

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JP2017016958A (en) * 2015-07-03 2017-01-19 パナソニックＩｐマネジメント株式会社 Dimmer

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EP2502461B1 (en) * 2009-11-20 2019-05-01 Lutron Electronics Company, Inc. Controllable-load circuit for use with a load control device
US9160224B2 (en) * 2009-11-25 2015-10-13 Lutron Electronics Co., Inc. Load control device for high-efficiency loads
US10187944B2 (en) * 2015-09-04 2019-01-22 Lutron Electronics Co., Inc. Load control device for high-efficiency loads
JP6830205B2 (en) * 2016-12-27 2021-02-17 パナソニックＩｐマネジメント株式会社 Load control device
MX2021006231A (en) * 2018-11-30 2021-12-10 Lutron Tech Co Llc Load control device configured to operate in two-wire and three-wire modes.

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JP2017016958A (en) * 2015-07-03 2017-01-19 パナソニックＩｐマネジメント株式会社 Dimmer

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