EP2405719A1 - LED lighting device and illumination fixture using the same - Google Patents
LED lighting device and illumination fixture using the same Download PDFInfo
- Publication number
- EP2405719A1 EP2405719A1 EP11172730A EP11172730A EP2405719A1 EP 2405719 A1 EP2405719 A1 EP 2405719A1 EP 11172730 A EP11172730 A EP 11172730A EP 11172730 A EP11172730 A EP 11172730A EP 2405719 A1 EP2405719 A1 EP 2405719A1
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- Prior art keywords
- voltage
- led lamp
- lamp
- connection
- power conversion
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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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]
- H05B45/30—Driver circuits
- H05B45/357—Driver circuits specially adapted for retrofit LED light sources
- H05B45/3578—Emulating the electrical or functional characteristics of discharge lamps
-
- 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
Definitions
- the present invention relates to an LED lighting device for lighting an LED (a light-emitting diode) and to an illumination fixture using the same.
- an LED lamp having a similar shape to that of a conventional straight tube fluorescent lamp is disclosed.
- the LED includes: a light source block configured by mounting many LEDs on a mounting substrate formed in a band plate shape: a glass tube formed to be a straight tube for internally housing the light source block; a base for closing both ends of the glass tube; and a terminal pin for supplying electric power to the light source block, the terminal pin projecting from a side surface of the base.
- the above-mentioned LED lamp is detachably attached to a lamp socket provided to a dedicated illumination fixture, and is turned on when the electric power (direct-current power) is supplied via the lamp socket from the LED lighting device mounted on the illumination fixture.
- Patent literature 2 describes the LED lighting device as a conventional example.
- control constant current control to detect a voltage (an output voltage) applied to the LED lamp (a lamp socket) and a current (an output current) flowing in the LED lamp, and to adjust an output voltage so that the output current can coincide with a target value (for example, a rated current of the LED lamp) is carried out.
- the present invention is achieved in consideration of the above-mentioned problems, and intends to prevent an LED lamp from breaking down by suppressing an electric current flowing when the LED lamp is attached to a lamp socket.
- An LED lighting device includes: a power conversion part able to vary an output voltage; a current detection part for detecting an output current supplied via a lamp socket from the power conversion part to the LED lamp; a voltage detection part for detecting the output voltage applied via the lamp socket to the LED lamp; a control part for increasing and decreasing the output voltage by controlling the power conversion part so that the output current detected by the current detection part can coincide with a target value; and a connection judgment part for judging whether or not the lamp socket is connected to the LED lamp, wherein the control part limits the output voltage to a predetermined minimum value or less by controlling the power conversion part in the case where a judgment result of the connection judgment part shows no connection and does not limit the output voltage to the predetermined minimum value or less in the case where the judgment result of the connection judgment part shows connection.
- the LED lighting device includes: a constant voltage source for applying a constant voltage via the lamp socket; and a detection resistance connected via the lamp socket in parallel to a resistance connected in parallel with a light-emitting diode in the LED lamp, wherein the connection judgment part determines the connection is done when a voltage drop in the detection resistance is less than a predetermined threshold value and determines the connection is not done when the voltage drop is the predetermined threshold value or more.
- control part limits the output voltage to the minimum value or less by controlling the power conversion part in the case where the output voltage detected by the voltage detection part falls below a predetermined threshold voltage when the judgment result of the connection judgment part shows the connection is done.
- An illumination fixture comprises: the LED lighting device according to any one of claims 1 to 3; the lamp socket; and a fixture body for holding the LED lighting device and the lamp socket.
- An LED lighting device and an illumination fixture according to the present invention has an effect of preventing an LED lamp from breaking down by suppressing an electric current flowing when the LED lamp is attached to a lamp socket.
- Fig. 1 is a circuit block diagram showing the embodiment of an LED lighting device according to the present invention.
- An LED lamp 110 lighted by the LED lighting device has a similar configuration to the LED lamp described in Patent Document 1.
- the LED lamp 110 includes a series circuit of many light-emitting diodes 111, a resistance Rx connected in parallel with the series circuit, a glass tube of a straight tube type (refer to Fig. 2 ), and bases (not shown in the drawings) for closing both ends of the glass tube.
- a pair of terminal pins (not shown in the drawings) connected via a lamp socket 120 to an output terminal of the LED lighting device is provided to the base to be projected.
- a direct current an output current Io
- Io an output current
- the LED lighting device includes an AC/DC converter 1, a power conversion part 2, a current detection part 3, a voltage detection part 4, a control part 5, a connection judgment part 6, and a constant voltage source 7.
- the AC/DC converter 1 converts an alternating voltage supplied from a commercial alternating power source 100 into a desired direct voltage, and, for example, includes a conventionally-known step-up chopper circuit (a power factor improvement circuit).
- the power conversion part 2 includes a conventionally-known step-down chopper circuit including: a semiconductor switching element (hereinafter, abbreviated to a switching element) 20 such as a bipolar transistor and a field-effect transistor; an inductor L; a diode D; and a capacitor C2.
- a semiconductor switching element hereinafter, abbreviated to a switching element 20 such as a bipolar transistor and a field-effect transistor
- an inductor L such as a bipolar transistor and a field-effect transistor
- a diode D such as a bipolar transistor and a field-effect transistor
- C2 capacitor
- the voltage detection part 4 includes a series circuit of voltage-dividing resistances R1 and R2 connected between the output terminals of the power conversion part 2 (between both ends of the capacitor C2). Then, detected voltages (voltages proportional to an output voltage Vo) divided by the voltage-dividing resistances R1 and R2 are outputted from the voltage detection part 4 to the control part 5.
- the current detection part 3 includes a detection resistance R3 inserted between the output terminal on a negative voltage side of the power conversion part 2 and a negative electrode side of the lamp socket 120. Then, the voltage stepping-down of the detection resistance R3 due to the output current Io is outputted as the detected voltage from the current detection part 3 to the control part 5.
- the control part 5 is configured by a controlling integrated circuit or a microcontroller and a memory, and controls the power conversion part 2 so that the output current Io detected by the current detection part 3 can coincide with a target value, thereby increasing and decreasing the output voltage Vo.
- the control part 5 is configured by the microcontroller and the memory
- data of a rated current value of the LED lamp 110 is preliminarily stored in the memory.
- the microcontroller converts the detected voltage received from the current detection part 3 into a magnitude of the output current Io (a current value), and adjusts an on-duty ratio of the switching element 20 so that the current value can coincide with the rated current value (the target value) stored in the memory, thereby increasing and decreasing the output voltage Vo. That is, the control part 5 carries out constant current control to pass a constant current (a rated current) through the LED lamp 110.
- Vf ⁇ n the forward voltage
- the control part 5 may carry out the constant current control within at least a range between 35V and 70V so that a plurality of the LED lamps having various rated voltage can be used.
- the constant voltage source 7 includes: a resistance R4 connected at one end to the output terminal on a higher potential side of the AC/DC converter 1; and a Zener diode 70 connected at the cathode to the other end of the resistance R4 and connected at the anode to a lower potential side of the lamp socket 120. Then, a constant voltage (a Zener voltage Vz) generated between both ends (between the cathode and anode) of the Zener diode 70 is applied via a resistance R5 to the lamp socket 120 and the connection judgment part 6, respectively. Meanwhile, the constant voltage (the Zener voltage) applied from the constant voltage source 7 is required to be lower than the rated voltage of the LED lamp 110.
- the constant voltage (the Zener voltage) can be set so as to be lower than the rated voltage referring to the LED lamp having a lower rated voltage as a criterion.
- the constant voltage (the Zener voltage) applied from the constant voltage source 7 has to be a lower voltage than the dangerous voltage.
- the voltage value of the dangerous voltage slightly varies depending on the specification, but generally is a voltage exceeding 50V in the direct current.
- the connection judgment part 6 includes: a series circuit of three resistances R5, R6, and R7 connected between the cathode of the Zener diode 70 and the lower potential side of the lamp socket 120; and a comparator 60 for comparing the voltage stepping-down in the resistance (detection resistance) R7 with a threshold voltage Vref. Meanwhile, the connection point of two resistances R5 and R6 is connected to the higher potential side of the lamp socket 120. In a state where the LED lamp 110 is not connected to the lamp socket 120 (an unloaded state), the voltage obtained by dividing the Zener voltage Vz with the resistances R5, R6, and R7 (the voltage stepping-down in the resistance R7) is inputted to a positive terminal of the comparator 60.
- the resistance Rx of the LED lamp 110 is connected in parallel to two resistances R6 and R7. Accordingly, the voltage stepping-down in the resistance R7 under the loaded state is lower than that under the unloaded state.
- the threshold voltage Vref inputted to a negative terminal of the comparator 60 is set to be a value between the voltage stepping-down in the resistance R7 under the loaded state and the voltage stepping-down in the resistance R7 under the unloaded state.
- the output of the comparator 60 becomes an H level under the unloaded state and becomes an L level under the loaded state.
- the output of the comparator 60 (the judgment result of the connection judgment part 6) is inputted to the control part 5, and in accordance with the output of the comparator 60, the control part 5 makes the power conversion part 2 be operating or non-operating.
- the AC/DC converter 1 operates to output the direct voltage.
- the constant voltage the Zener voltage Vz
- the connection judgment part 6 carries out the judgment, the loaded state or the unloaded state.
- the control part 5 makes the power conversion part 2 operate to start the constant current control. Meanwhile, in the case where the judgment result of the connection judgment part 6 is the unloaded state, the control part 5 does not make the power conversion part 5 operate.
- the control part 5 stops the operation of the power conversion part 2 until the connection judgment part 6 judges whether or not the LED lamp 110 is connected. And, since the control part 5 starts the operation of the power conversion part 2 after the connection judgment part 6 judges the connection is done (the loaded state), a voltage equal to or more than the rated voltage is not applied to the LED lamp 110. As the result, the current flowing when the LED lamp 110 is attached to the lamp socket 120 is suppressed, and accordingly the LED lamp 110 can be prevented from breaking down.
- the LED lamp 110 is detached from the lamp socket 120 under a condition where the power conversion part 2 is operating.
- the output current Io does not flow; however, the output voltage Vo of the power conversion part 2 is increased because the control part 5 continues the constant current control.
- the control part 5 cancels the constant current control to stop the power conversion part 2. Accordingly, when the LED lamp 110 is connected to the lamp socket 110 next time, the connection judgment by the connection judgment part 6 is carried out under the state the output of the power conversion part 2 stops as described above.
- the resistance value of the resistance R5 is set to be relatively small, the current passes the resistance R5 and the Zener diode 70, and thus the voltage applied to the lamp socket 120 can be rapidly decreased.
- the control part 5 cancels the constant current control to stop the power conversion part 2.
- the control part 5 stops the operation of the power conversion part 2, and thus the broken LED lamp 110 can be prevented from being continuously used.
- the control part 5 stops the power conversion part 2 in the unloaded state and in the breaking-down; however, the stopping is not necessarily required.
- the control part 5 controls the power conversion part 2 to limit the output voltage Vo to be the minimum value sufficiently lower than the rated voltage of the LED lamp 110 or less.
- the LED lighting device according to the present embodiment lights one LED lamp 10; however, it is needless to say that the plurality of LED lamps 110 connected in series can be lighted at the same time.
- the connection judgment part 6 judges the loaded state and the unloaded state, and when the judgment result shows the loaded state, the control part 5 may operate the AC/DC converter 1 and the power conversion part 2.
- the LED lighting device is mounted on the illumination fixture shown in Fig. 2 .
- the illumination fixture includes: a fixture body 130 directly fixed to a ceiling; and a pair of lamp sockets 120 provided to the fixture body 130.
- the fixture body 130 is formed in a long angulated cylindrical shape whose side surface shape seen from the longitudinal direction is a trapezoidal shape, and internally houses the LED lighting device. And, the lamp sockets 120 and 120 are arranged on both end parts in the longitudinal direction on a lower surface of the fixture body 130, respectively.
- the lamp sockets 120 and 120 have the same structure as that of a conventionally-known lamp socket for a straight tube fluorescent lamp.
- a direct current is supplied from any one of two lamp sockets 120 and 120 to the LED lamp 110, there is a possibility that the direct current is supplied to the filament part when the fluorescent lamp is attached to the lamp sockets 120 and 120 by mistake.
- an electrode shape of the base of the LED lamp 110 may be formed to be a different shape from that of the fluorescent lamp, and the lamp sockets 120 and 120 may have a structure conforming to the base of the LED lamp 110.
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
- The present invention relates to an LED lighting device for lighting an LED (a light-emitting diode) and to an illumination fixture using the same.
- In these years, an LED has been increasingly used as a light source for lighting instead of a fluorescent lamp. For example, in
Patent Literature 1, an LED lamp having a similar shape to that of a conventional straight tube fluorescent lamp is disclosed. The LED includes: a light source block configured by mounting many LEDs on a mounting substrate formed in a band plate shape: a glass tube formed to be a straight tube for internally housing the light source block; a base for closing both ends of the glass tube; and a terminal pin for supplying electric power to the light source block, the terminal pin projecting from a side surface of the base. The above-mentioned LED lamp is detachably attached to a lamp socket provided to a dedicated illumination fixture, and is turned on when the electric power (direct-current power) is supplied via the lamp socket from the LED lighting device mounted on the illumination fixture. - In addition,
Patent literature 2 describes the LED lighting device as a conventional example. In the conventional example described inPatent Document 2, control (constant current control) to detect a voltage (an output voltage) applied to the LED lamp (a lamp socket) and a current (an output current) flowing in the LED lamp, and to adjust an output voltage so that the output current can coincide with a target value (for example, a rated current of the LED lamp) is carried out. -
- [Patent literature 1]
JP 2009-43447A - [Patent literature 2]
JP 2006-210271A - However, in the case of replacing the LED lamp and the like, under a state where an LED lighting device keeps operating, the LED lamp was detached from the lamp socket, and then the LED lamp is sometimes attached to the lamp socket again. In this case, there is a possibility that an excessive current over a rated value flows in the LED lamp immediately after the LED lamp has been attached to the lamp socket. And, when the excessive current has flown, there is a possibility that a light-emitting diode of the LED lamp is broken down.
- The present invention is achieved in consideration of the above-mentioned problems, and intends to prevent an LED lamp from breaking down by suppressing an electric current flowing when the LED lamp is attached to a lamp socket.
- An LED lighting device according to the present invention includes: a power conversion part able to vary an output voltage; a current detection part for detecting an output current supplied via a lamp socket from the power conversion part to the LED lamp; a voltage detection part for detecting the output voltage applied via the lamp socket to the LED lamp; a control part for increasing and decreasing the output voltage by controlling the power conversion part so that the output current detected by the current detection part can coincide with a target value; and a connection judgment part for judging whether or not the lamp socket is connected to the LED lamp, wherein the control part limits the output voltage to a predetermined minimum value or less by controlling the power conversion part in the case where a judgment result of the connection judgment part shows no connection and does not limit the output voltage to the predetermined minimum value or less in the case where the judgment result of the connection judgment part shows connection.
- In the LED lighting device, it is preferred that the LED lighting device includes: a constant voltage source for applying a constant voltage via the lamp socket; and a detection resistance connected via the lamp socket in parallel to a resistance connected in parallel with a light-emitting diode in the LED lamp, wherein the connection judgment part determines the connection is done when a voltage drop in the detection resistance is less than a predetermined threshold value and determines the connection is not done when the voltage drop is the predetermined threshold value or more.
- In the LED lighting device, it is preferred that the control part limits the output voltage to the minimum value or less by controlling the power conversion part in the case where the output voltage detected by the voltage detection part falls below a predetermined threshold voltage when the judgment result of the connection judgment part shows the connection is done.
- An illumination fixture according to the present invention comprises: the LED lighting device according to any one of
claims 1 to 3; the lamp socket; and a fixture body for holding the LED lighting device and the lamp socket. - An LED lighting device and an illumination fixture according to the present invention has an effect of preventing an LED lamp from breaking down by suppressing an electric current flowing when the LED lamp is attached to a lamp socket.
-
- [
Fig. 1] Fig. 1 is a circuit block diagram showing an embodiment of an LED lighting device according to the present invention. - [
Fig. 2] Fig. 2 ] is a perspective view showing an embodiment of an illumination fixture according to the present invention. - Referring to drawings, an embodiment of the present invention will be explained in detail below referring to drawings.
-
Fig. 1 is a circuit block diagram showing the embodiment of an LED lighting device according to the present invention. - An
LED lamp 110 lighted by the LED lighting device according to the embodiment has a similar configuration to the LED lamp described inPatent Document 1. Specifically, theLED lamp 110 includes a series circuit of many light-emitting diodes 111, a resistance Rx connected in parallel with the series circuit, a glass tube of a straight tube type (refer toFig. 2 ), and bases (not shown in the drawings) for closing both ends of the glass tube. Meanwhile, a pair of terminal pins (not shown in the drawings) connected via alamp socket 120 to an output terminal of the LED lighting device is provided to the base to be projected. Then, a direct current (an output current Io) is supplied via the terminal pin from thelamp socket 120 to the light-emitting diode 111. - The LED lighting device according to the embodiment includes an AC/
DC converter 1, apower conversion part 2, acurrent detection part 3, avoltage detection part 4, acontrol part 5, aconnection judgment part 6, and aconstant voltage source 7. The AC/DC converter 1 converts an alternating voltage supplied from a commercialalternating power source 100 into a desired direct voltage, and, for example, includes a conventionally-known step-up chopper circuit (a power factor improvement circuit). - The
power conversion part 2 includes a conventionally-known step-down chopper circuit including: a semiconductor switching element (hereinafter, abbreviated to a switching element) 20 such as a bipolar transistor and a field-effect transistor; an inductor L; a diode D; and a capacitor C2. - The
voltage detection part 4 includes a series circuit of voltage-dividing resistances R1 and R2 connected between the output terminals of the power conversion part 2 (between both ends of the capacitor C2). Then, detected voltages (voltages proportional to an output voltage Vo) divided by the voltage-dividing resistances R1 and R2 are outputted from thevoltage detection part 4 to thecontrol part 5. In addition, thecurrent detection part 3 includes a detection resistance R3 inserted between the output terminal on a negative voltage side of thepower conversion part 2 and a negative electrode side of thelamp socket 120. Then, the voltage stepping-down of the detection resistance R3 due to the output current Io is outputted as the detected voltage from thecurrent detection part 3 to thecontrol part 5. - The
control part 5 is configured by a controlling integrated circuit or a microcontroller and a memory, and controls thepower conversion part 2 so that the output current Io detected by thecurrent detection part 3 can coincide with a target value, thereby increasing and decreasing the output voltage Vo. In the case where thecontrol part 5 is configured by the microcontroller and the memory, data of a rated current value of theLED lamp 110 is preliminarily stored in the memory. Then, the microcontroller (the controller 5) converts the detected voltage received from thecurrent detection part 3 into a magnitude of the output current Io (a current value), and adjusts an on-duty ratio of theswitching element 20 so that the current value can coincide with the rated current value (the target value) stored in the memory, thereby increasing and decreasing the output voltage Vo. That is, thecontrol part 5 carries out constant current control to pass a constant current (a rated current) through theLED lamp 110. - Here, the rated voltage of the
LED lamp 110 is a value obtained by multiplying a forward voltage Vf of the used light-emitting diode 111 by the number n of the light-emitting diodes 111 (= Vf × n). For example, when the forward voltage Vf is 3.5 V and the number n of the light-emitting diodes 111 is 20, the rated voltage is 3.5 × 20 = 70 V, and when the number n of the light-emitting diodes 111 is 10, the rated voltage is 3.5 × 10 = 35 V.
In addition, thecontrol part 5, for example, may carry out the constant current control within at least a range between 35V and 70V so that a plurality of the LED lamps having various rated voltage can be used. - The
constant voltage source 7 includes: a resistance R4 connected at one end to the output terminal on a higher potential side of the AC/DC converter 1; and a Zener diode 70 connected at the cathode to the other end of the resistance R4 and connected at the anode to a lower potential side of thelamp socket 120. Then, a constant voltage (a Zener voltage Vz) generated between both ends (between the cathode and anode) of the Zener diode 70 is applied via a resistance R5 to thelamp socket 120 and theconnection judgment part 6, respectively. Meanwhile, the constant voltage (the Zener voltage) applied from theconstant voltage source 7 is required to be lower than the rated voltage of theLED lamp 110. In the case of the configuration where the plurality of LED lamps having various rated voltage can be used, the constant voltage (the Zener voltage) can be set so as to be lower than the rated voltage referring to the LED lamp having a lower rated voltage as a criterion. Moreover, in the case where the rated voltage of the LED lamp exceeds a dangerous voltage and the voltages divided by the resistances R5, R6, and R7 exceed the dangerous voltage, the constant voltage (the Zener voltage) applied from theconstant voltage source 7 has to be a lower voltage than the dangerous voltage. The voltage value of the dangerous voltage slightly varies depending on the specification, but generally is a voltage exceeding 50V in the direct current. - The
connection judgment part 6 includes: a series circuit of three resistances R5, R6, and R7 connected between the cathode of the Zener diode 70 and the lower potential side of thelamp socket 120; and acomparator 60 for comparing the voltage stepping-down in the resistance (detection resistance) R7 with a threshold voltage Vref. Meanwhile, the connection point of two resistances R5 and R6 is connected to the higher potential side of thelamp socket 120. In a state where theLED lamp 110 is not connected to the lamp socket 120 (an unloaded state), the voltage obtained by dividing the Zener voltage Vz with the resistances R5, R6, and R7 (the voltage stepping-down in the resistance R7) is inputted to a positive terminal of thecomparator 60. Meanwhile, in a state where theLED lamp 110 is connected to the lamp socket 120 (a loaded state), the resistance Rx of theLED lamp 110 is connected in parallel to two resistances R6 and R7. Accordingly, the voltage stepping-down in the resistance R7 under the loaded state is lower than that under the unloaded state. Here, the threshold voltage Vref inputted to a negative terminal of thecomparator 60 is set to be a value between the voltage stepping-down in the resistance R7 under the loaded state and the voltage stepping-down in the resistance R7 under the unloaded state. Hence, the output of thecomparator 60 becomes an H level under the unloaded state and becomes an L level under the loaded state. In addition, the output of the comparator 60 (the judgment result of the connection judgment part 6) is inputted to thecontrol part 5, and in accordance with the output of thecomparator 60, thecontrol part 5 makes thepower conversion part 2 be operating or non-operating. - Next, an operation of the LED lighting device according to the embodiment will be explained. Firstly, when a power source switch is turned on to start the power source supply from the commercial
alternating power source 100, the AC/DC converter 1 operates to output the direct voltage. When the direct voltage is outputted from the AC/DC converter 1, the constant voltage (the Zener voltage Vz) is applied from theconstant voltage source 7 to theconnection judgment part 6 and thelamp socket 120. Then, theconnection judgment part 6 carries out the judgment, the loaded state or the unloaded state. When the judgment result of theconnection judgment part 6 is the loaded state, thecontrol part 5 makes thepower conversion part 2 operate to start the constant current control. Meanwhile, in the case where the judgment result of theconnection judgment part 6 is the unloaded state, thecontrol part 5 does not make thepower conversion part 5 operate. - Here, in the case where a voltage equal to or more than the rated voltage of the
LED lamp 110 is outputted from thepower conversion part 2 under the unloaded state, there is a possibility that an over current exceeding the rated value flows immediately after theLED lamp 110 is connected to thelamp socket 120. However, in the LED lighting device according to the present embodiment, thecontrol part 5 stops the operation of thepower conversion part 2 until theconnection judgment part 6 judges whether or not theLED lamp 110 is connected. And, since thecontrol part 5 starts the operation of thepower conversion part 2 after theconnection judgment part 6 judges the connection is done (the loaded state), a voltage equal to or more than the rated voltage is not applied to theLED lamp 110. As the result, the current flowing when theLED lamp 110 is attached to thelamp socket 120 is suppressed, and accordingly theLED lamp 110 can be prevented from breaking down. - Subsequently, the case where the
LED lamp 110 is detached from thelamp socket 120 under a condition where thepower conversion part 2 is operating will be explained. When theLED lamp 110 is detached from thelamp socket 120, the output current Io does not flow; however, the output voltage Vo of thepower conversion part 2 is increased because thecontrol part 5 continues the constant current control. And, when the output voltage Vo detected by thevoltage detection part 4 exceeds a predetermined maximum value (> the rated voltage), thecontrol part 5 cancels the constant current control to stop thepower conversion part 2. Accordingly, when theLED lamp 110 is connected to thelamp socket 110 next time, the connection judgment by theconnection judgment part 6 is carried out under the state the output of thepower conversion part 2 stops as described above. Moreover, immediately after theLED lamp 110 is detached from thelamp socket 120 to stop thepower conversion part 2, a high voltage (= the predetermined maximum value) is generated in thelamp socket 120. However, when the resistance value of the resistance R5 is set to be relatively small, the current passes the resistance R5 and the Zener diode 70, and thus the voltage applied to thelamp socket 120 can be rapidly decreased. - Finally, the case where the
LED lamp 110 is broken down under the condition where thepower conversion part 2 is operating will be explained. However, in the case of breaking-down caused when a line in theLED lamp 110 is broken (opened), the case is substantially similar to the case where theLED lamp 110 is detached from thelamp socket 120 as described above, and accordingly the explanation is omitted. - In the case of breaking-down caused when the line in the
LED lamp 110 shorts, the number of the light-emittingdiodes 111 is substantially reduced, and thus the output voltage Vo of thepower conversion part 2 is reduced when thecontrol part 5 carries out the constant current control. Then, when the output voltage detected by thevoltage detection part 4 falls below the predetermined value (<the rated voltage), thecontrol part 5 cancels the constant current control to stop thepower conversion part 2. - As described above, in the case where the breaking down such as the breaking of wire and the short-circuit is caused in the
LED lamp 110, thecontrol part 5 stops the operation of thepower conversion part 2, and thus thebroken LED lamp 110 can be prevented from being continuously used. - Meanwhile, in the present embodiment, the
control part 5 stops thepower conversion part 2 in the unloaded state and in the breaking-down; however, the stopping is not necessarily required. For example, in the unloaded state and in the breaking-down, thecontrol part 5 controls thepower conversion part 2 to limit the output voltage Vo to be the minimum value sufficiently lower than the rated voltage of theLED lamp 110 or less. In addition, the LED lighting device according to the present embodiment lights one LED lamp 10; however, it is needless to say that the plurality ofLED lamps 110 connected in series can be lighted at the same time. In addition, after the power source supply from the commercial alternatingpower source 100 is started, theconnection judgment part 6 judges the loaded state and the unloaded state, and when the judgment result shows the loaded state, thecontrol part 5 may operate the AC/DC converter 1 and thepower conversion part 2. - Meanwhile, the LED lighting device according to the embodiment, for example, is mounted on the illumination fixture shown in
Fig. 2 . The illumination fixture includes: afixture body 130 directly fixed to a ceiling; and a pair oflamp sockets 120 provided to thefixture body 130. - The
fixture body 130 is formed in a long angulated cylindrical shape whose side surface shape seen from the longitudinal direction is a trapezoidal shape, and internally houses the LED lighting device. And, thelamp sockets fixture body 130, respectively. Thelamp sockets lamp sockets LED lamp 110, there is a possibility that the direct current is supplied to the filament part when the fluorescent lamp is attached to thelamp sockets power conversion part 2 is stopped when the output voltage detected by thevoltage detection part 4 falls below a predetermined value (< the rated voltage) as described above, there is not a possibility that an unsafe phenomenon and the breaking-down of the lighting device are caused even in the case where the fluorescent lamp is attached by mistake. However, when attaching the fluorescent lamp by mistake, a user cannot distinguish whether it is safe or not. Hence, in order to prevent the mistake attachment, an electrode shape of the base of theLED lamp 110 may be formed to be a different shape from that of the fluorescent lamp, and thelamp sockets LED lamp 110. -
- 2 Power conversion part
- 3 Current detection part
- 4 Voltage detection part
- 5 Control part
- 6 Connection judgment part
- 110 LED lamp
- 120 Lamp socket
Claims (4)
- An LED lighting device comprising: a power conversion part able to vary an output voltage; a current detection part for detecting an output current supplied via a lamp socket from the power conversion part to the LED lamp; a voltage detection part for detecting the output voltage applied via the lamp socket to the LED lamp; a control part for increasing and decreasing the output voltage by controlling the power conversion part so that the output current detected by the current detection part can coincide with a target value; and a connection judgment part for judging whether or not the lamp socket is connected to the LED lamp, wherein
the control part limits the output voltage to a predetermined minimum value or less by controlling the power conversion part in the case where a judgment result of the connection judgment part shows a no connection and does not limit the output voltage to the predetermined minimum value or less in the case where the judgment result of the connection judgment part shows connection. - The LED lighting device according to claim 1, comprising: a constant voltage source for applying a constant voltage via the lamp socket; and a detection resistance connected via the lamp socket in parallel to a resistance connected in parallel with a light-emitting diode in the LED lamp, wherein
the connection judgment part determines the connection is done when a voltage drop in the detection resistance is less than a predetermined threshold value and determines the connection is not done when the voltage drop is the predetermined threshold value or more. - The LED lighting device according to claim 1 or 2, wherein
the control part limits the output voltage to the minimum value or less by controlling the power conversion part in the case where the output voltage detected by the voltage detection part falls below a predetermined threshold voltage when the judgment result of the connection judgment part shows the connection is done. - An illumination fixture comprising: the LED lighting device according to any one of claims 1 to 3; the lamp socket; and a fixture body for supporting the LED lighting device and the lamp socket.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP2010154130 | 2010-07-06 |
Publications (2)
Publication Number | Publication Date |
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EP2405719A1 true EP2405719A1 (en) | 2012-01-11 |
EP2405719B1 EP2405719B1 (en) | 2013-09-11 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP11172730.1A Not-in-force EP2405719B1 (en) | 2010-07-06 | 2011-07-05 | LED lighting device and illumination fixture using the same |
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EP (1) | EP2405719B1 (en) |
JP (3) | JP5828104B2 (en) |
Cited By (2)
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EP2731249A1 (en) * | 2012-11-08 | 2014-05-14 | Samsung Electro-Mechanics Co., Ltd | Power supply apparatus for illumination |
WO2015028526A1 (en) * | 2013-08-27 | 2015-03-05 | Koninklijke Philips N.V. | Led retrofit lamp having active over-current protection circuit |
Families Citing this family (8)
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JP5955061B2 (en) * | 2012-04-04 | 2016-07-20 | シャープ株式会社 | Power supply device and lighting device |
JP6025371B2 (en) * | 2012-04-11 | 2016-11-16 | 三菱電機株式会社 | Power supply device and lighting fixture |
JP6127402B2 (en) * | 2012-07-24 | 2017-05-17 | 三菱電機株式会社 | Lighting device and lighting fixture provided with the lighting device |
JP2016025076A (en) * | 2014-07-25 | 2016-02-08 | 三菱電機株式会社 | Lighting device |
JP2018113733A (en) * | 2017-01-06 | 2018-07-19 | 東芝ライテック株式会社 | Power supply device and illuminating device comprising the same |
JP6821440B2 (en) * | 2017-01-06 | 2021-01-27 | 東芝ライテック株式会社 | Power supply device and lighting device equipped with this power supply device |
JP7153873B2 (en) * | 2018-11-15 | 2022-10-17 | パナソニックIpマネジメント株式会社 | Lighting device, lighting device and emergency lighting system |
JP7278171B2 (en) * | 2019-08-08 | 2023-05-19 | シーシーエス株式会社 | LED burn-out detection mechanism and LED light irradiation system using the same |
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Also Published As
Publication number | Publication date |
---|---|
EP2405719B1 (en) | 2013-09-11 |
JP2012033459A (en) | 2012-02-16 |
JP5379922B2 (en) | 2013-12-25 |
JP5379921B2 (en) | 2013-12-25 |
JP2013101988A (en) | 2013-05-23 |
JP5828104B2 (en) | 2015-12-02 |
JP2013101987A (en) | 2013-05-23 |
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