WO2015125655A1 - 受電装置、給電制御方法、および給電システム - Google Patents
受電装置、給電制御方法、および給電システム Download PDFInfo
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- WO2015125655A1 WO2015125655A1 PCT/JP2015/053585 JP2015053585W WO2015125655A1 WO 2015125655 A1 WO2015125655 A1 WO 2015125655A1 JP 2015053585 W JP2015053585 W JP 2015053585W WO 2015125655 A1 WO2015125655 A1 WO 2015125655A1
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- power
- power supply
- receiving device
- load
- power receiving
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00034—Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
Definitions
- the present disclosure relates to a power receiving device that wirelessly receives power from a power feeding device, a power feeding control method used in such a power receiving device, and a power feeding system using such a power receiving device.
- a mobile phone can be charged by placing a mobile phone (power receiving device) on a power supply tray (power supply device).
- a method for performing such wireless power feeding for example, there are an electromagnetic induction method, a magnetic field resonance method using a resonance phenomenon (also referred to as a magnetic resonance method), and the like. In these systems, power is transmitted using magnetic coupling between the power feeding coil of the power feeding device and the power receiving coil of the power receiving device.
- the electromagnetic induction method has an advantage that the degree of coupling between the feeding coil and the receiving coil can be increased, and the efficiency of feeding can be increased.
- communication by so-called load modulation is often performed prior to power feeding, for example, adjustment of power feeding power is performed.
- Patent Document 1 a passive mode in which communication is performed by load modulation and an active mode in which communication is performed by operating with a power supply supplied from the power storage unit are selected according to the power storage state of the power storage unit.
- An RF tag is disclosed.
- an electronic device does not generate an excessive voltage from the viewpoint of reliability and the like, and it is expected that an excessive voltage is not generated even in a power supply system.
- the power receiving device includes a power generation unit and a communication unit.
- the power generation unit generates direct-current power based on a power signal supplied wirelessly from the power supply apparatus.
- the communication unit sets the load of the power signal in accordance with the output current of the power generation unit, and performs communication with the power supply apparatus by modulating the load.
- a power supply control method generates DC power based on a power signal wirelessly supplied from a power supply apparatus, and sets a load of the power signal according to a current to a circuit to which the DC power is supplied. And communicating with the power feeding apparatus by modulating the load.
- the power supply system includes a power supply device and a power reception device.
- the power receiving apparatus includes a power generation unit and a communication unit.
- the power generation unit generates direct-current power based on a power signal supplied wirelessly from the power supply apparatus.
- the communication unit sets the load of the power signal in accordance with the output current of the power generation unit, and performs communication with the power supply apparatus by modulating the load.
- the direct-current power is generated based on the power signal wirelessly supplied from the power supply device, and the load of the power signal is modulated, Communication is performed with the power supply apparatus. At that time, the load is set according to the output current of the power generation unit.
- the power receiving device since the load of the power signal is set according to the output current of the power generation unit, an excessive voltage may be generated. Can be reduced.
- the effect described here is not necessarily limited, and there may be any effect described in the present disclosure.
- FIG. 2 is a block diagram illustrating a configuration example of a power feeding device illustrated in FIG. 1.
- FIG. 2 is a block diagram illustrating a configuration example of an electronic device illustrated in FIG. 1.
- FIG. 4 is a circuit diagram illustrating a configuration example of a communication unit illustrated in FIG. 3. 3 is a flowchart illustrating an operation example of the power feeding system illustrated in FIG. 1.
- FIG. 4 is a circuit diagram illustrating an equivalent circuit of the power receiving device illustrated in FIG. 3. It is a circuit diagram showing the example of 1 structure of the communication part which concerns on a comparative example.
- FIG. 6 is a characteristic diagram illustrating an operation example of the power feeding system illustrated in FIG. 1.
- FIG. 1 illustrates a configuration example of a power feeding system according to an embodiment.
- the power feeding system 1 is a power feeding system that supplies power by electromagnetic induction.
- the power receiving apparatus and power feeding control method according to the embodiment of the present disclosure are embodied by the present embodiment, they will be described together.
- the power feeding system 1 includes a power feeding device 10 and an electronic device 90.
- the power supply device 10 is a tray-type power supply device.
- the power supply device 20 (described later) is incorporated into the electronic device 90.
- the secondary battery 31 (described later) can be charged by supplying power.
- a power supply coil 131 described later is disposed on a power supply surface S1 (side in contact with the electronic device 90) of the power supply device 10, and power reception described later is provided on a power reception surface (side in contact with the power supply device 10) of the electronic device 90.
- a coil 211 is arranged.
- the power supply apparatus 10 supplies power to the electronic device 90 by electromagnetic induction via the power supply coil 131 and the power reception coil 211.
- the power receiving device 20 of the electronic device 90 communicates with the power supply device 10 by so-called load modulation, and instructs the power supply device 10 to supply power.
- the user can charge the secondary battery 31 without directly connecting an AC (Alternating Current) adapter or the like to the electronic device 90, and the convenience of the user can be improved.
- AC Alternating Current
- the electronic device 90 is a digital camera, but is not limited to this.
- various portable terminal devices such as a video camera, a smartphone, a mobile battery, a tablet, an electronic book reader, and an audio player are available. Is available.
- the power supply apparatus 10 supplies power to one electronic device 90.
- the power supply device 10 is not limited to this. Instead, the power supply device 10 supplies power to two or more electronic devices 90. The power may be supplied simultaneously or time-divisionally (sequentially).
- FIG. 2 shows a configuration example of the power supply apparatus 10.
- the power supply apparatus 10 includes an AC / DC converter 11, a power transmission driver 12, a power supply coil 131, a capacitive element 132, a communication unit 14, and a control unit 15.
- the AC / DC converter 11 converts an AC power supply signal supplied from the AC power supply 9 into a DC power supply signal and supplies it to the power transmission driver 12.
- the AC power supply signal is supplied to the power supply apparatus 10, but the present invention is not limited to this.
- a DC power supply signal may be supplied instead.
- the AC / DC converter 11 can be omitted.
- the power transmission driver 12 generates an AC power signal Sp1 having a rectangular waveform based on the DC power supply signal supplied from the AC / DC converter 11, and serves as an inter-terminal signal between the first output terminal and the second output terminal. Output. At that time, the power transmission driver 12 can change the power supply frequency fp of the power signal Sp ⁇ b> 1 based on an instruction from the control unit 15.
- the feeding coil 131 is coupled to the power receiving coil 211 of the power receiving device 20 via an electromagnetic field.
- One end of the power supply coil 131 is connected to the first output terminal of the power transmission driver 12 via the capacitive element 132, and the other end is connected to the second output terminal of the power transmission driver 12.
- the feeding coil 131 and the capacitive element 132 are connected in series to form an LC resonance circuit.
- the power signal Sp ⁇ b> 1 is supplied by the power transmission driver 12 between both ends of the power supply coil 131 and the capacitive element 132 connected in series, whereby the power supply coil 131 generates an electromagnetic field.
- the power feeding device 10 feeds power to the power receiving device 20 of the electronic device 90 via this electromagnetic field.
- the communication unit 14 communicates with a power receiving device 20 (described later) of the electronic device 90 and receives a power supply control signal CTL.
- the power supply control signal CTL includes information necessary for the power supply operation, such as a request to increase or decrease power supply to the power supply apparatus 10.
- the communication unit 14 receives the power supply control signal CTL from the power receiving device 20 by so-called load modulation. Specifically, first, the power feeding device 10 feeds power to the power receiving device 20, and the communication unit 40 (described later) of the power receiving device 20 transmits a signal to be transmitted (power feeding control signal CTL) during the power feeding period. Change the load accordingly. This change in load appears as a change in the amplitude or phase of the power signal Sp1 in the power supply apparatus 10.
- the communication unit 14 can receive the power supply control signal CTL transmitted from the power receiving device 20 by detecting a change in the amplitude or phase of the power signal Sp1.
- the communication unit 14 has received the power supply control signal CTL from the power receiving device 20 of the electronic device 90.
- the communication unit 14 is not limited to this, and in addition to the power supply control signal CTL, You may receive it.
- the communication unit 14 may further have a function of transmitting a signal to the power receiving device 20.
- the control unit 15 controls the transmission driver 12 based on the power supply control signal CTL, and controls the power supplied to the power receiving device 20 (described later) of the electronic device 90. At that time, the control unit 15 controls the power feeding power by changing the power feeding efficiency from the power feeding device 10 to the power receiving device 20 by controlling the power feeding frequency fp of the power signal Sp1 generated by the power transmission driver 12. It has become.
- FIG. 3 shows a configuration example of the electronic device 90.
- the electronic device 90 includes the power receiving device 20, the secondary battery 31, and the electronic circuit 32.
- the power receiving device 20 includes a power receiving coil 211, capacitive elements 212 and 213, a rectifier circuit 22, a current detection unit 23, a voltage detection unit 24, a control unit 25, a communication unit 40, and a regulator 27. Yes.
- the feeding coil 211 is coupled to the feeding coil 131 of the feeding device 10 via an electromagnetic field.
- One end of the power receiving coil 211 is connected to the first input terminal of the rectifier circuit 22 via the capacitive element 212, and the other end is connected to the second input terminal of the rectifier circuit 22.
- a capacitive element 213 is inserted between the first input terminal and the second input terminal of the rectifier circuit 21. In this way, the power receiving coil 211 and the capacitive element 212 are connected in series to form an LC resonance circuit.
- the power receiving coil 211 generates an induced voltage corresponding to the change in the magnetic flux according to the law of electromagnetic induction based on the electromagnetic field generated by the power feeding coil 131 of the power feeding device 10.
- a circuit including the power receiving coil 211 and the capacitive elements 212 and 213 generates an AC power signal Sp2 having a voltage corresponding to the induced voltage between both ends of the power receiving coil 211 and supplies the AC power signal Sp2 to the rectifier circuit 22. That is, the power signal Sp2 is generated based on the power signal Sp1 in the power supply apparatus 10.
- the rectifier circuit 22 rectifies the AC power signal Sp2 to generate a DC signal having the voltage Vrect, and is a bridge-type full-wave rectifier circuit.
- the rectifier circuit 22 includes diodes 221 to 224 and a capacitor element 225.
- the anode of the diode 221 is connected to the first input terminal of the rectifier circuit 22, and the cathode is connected to the first output terminal of the rectifier circuit 22.
- the anode of the diode 222 is connected to the second output terminal of the rectifier circuit 22, and the cathode is connected to the first input terminal of the rectifier circuit 22.
- the anode of the diode 223 is connected to the second input terminal of the rectifier circuit 22, and the cathode is connected to the first output terminal of the rectifier circuit 22.
- the anode of the diode 224 is connected to the second output terminal, and the cathode is connected to the second input terminal.
- One end of the capacitive element 225 is connected to the first output terminal of the rectifier circuit 22, and the other end is connected to the second output terminal of the rectifier circuit 22.
- the second output terminal of the rectifier circuit 22 is grounded. As a result, a rectified and smoothed DC signal is generated at the first output terminal of the rectifier circuit 22.
- the rectifier circuit 22 is configured using the diodes 221 to 224 and the capacitor 225.
- the present invention is not limited to this, and various rectifier circuits can be applied.
- the current detector 23 detects the current Irect at the first output terminal of the rectifier circuit 22.
- the current detection unit 23 supplies the detection result DET to the communication unit 40.
- the voltage detector 24 detects the voltage Vrect at the first output terminal of the rectifier circuit 22.
- the voltage detection unit 24 supplies the detection result to the control unit 25.
- the control unit 25 generates the power supply control signal CTL based on the detection result of the voltage detection unit 24. Specifically, based on the output voltage Vrect of the rectifier circuit 22, the control unit 25 makes a request for increasing or decreasing power supply to the power supply apparatus 10 via the power supply control signal CTL, and for example, this voltage Vrect. Is controlled to fall within a predetermined voltage range.
- the communication unit 40 communicates with the power supply apparatus 10 and transmits a power supply control signal CTL. Specifically, the communication unit 40 transmits a power supply control signal CTL to the power supply apparatus 10 by changing a load according to data to be transmitted (power supply control signal CTL).
- FIG. 4 shows a configuration example of the communication unit 40.
- the communication unit 40 includes modulation circuits 41 and 42 and a communication control unit 43.
- the modulation circuit 41 includes capacitive elements 411 and 413 and transistors 412 and 414.
- the capacitance values of the capacitive elements 411 and 413 are, for example, 22 [nF].
- the transistors 412 and 414 are N-channel MOS (Metal Oxide Semiconductor) type FETs (Field Effect Transistors).
- One end of the capacitor 411 is connected to the first input terminal of the rectifier circuit 22, and the other end is connected to the drain of the transistor 412.
- a control signal is supplied from the communication control unit 43 to the gate of the transistor 412, the drain is connected to the other end of the capacitor 411, and the source is grounded.
- One end of the capacitor 413 is connected to the second input terminal of the rectifier circuit 22, and the other end is connected to the drain of the transistor 414.
- a control signal is supplied to the gate of the transistor 414 from the communication control unit 43, the drain is connected to the other end of the capacitor 413, and the source is grounded.
- the modulation circuit 42 has a configuration similar to that of the modulation circuit 41, and includes capacitive elements 421 and 423 and transistors 422 and 424.
- the capacitance values of the capacitance elements 421 and 423 are lower than the capacitance values of the capacitance elements 411 and 413 of the modulation circuit 41, for example, 4.7 [nF].
- the transistors 422 and 423 are N-channel MOS type FETs in this example.
- One end of the capacitor 421 is connected to the first input terminal of the rectifier circuit 22, and the other end is connected to the drain of the transistor 422.
- a control signal is supplied to the gate of the transistor 422 from the communication control unit 43, the drain is connected to the other end of the capacitor 421, and the source is grounded.
- One end of the capacitor 423 is connected to the second input terminal of the rectifier circuit 22, and the other end is connected to the drain of the transistor 424.
- a control signal is supplied to the gate of the transistor 424 from the communication control unit 43, the drain is connected to the other end of the capacitor 423, and the source is grounded.
- the communication control unit 43 controls the operation of the modulation circuits 41 and 42 based on the detection result DET and the power supply control signal CTL. Specifically, the communication control unit 43 compares the current value of the output current Irect of the rectifier circuit 22 with a predetermined threshold value Ith based on the detection result DET, and based on the comparison result, the modulation circuit 41. , 42 is selected. When the modulation circuit 41 is selected, the communication control unit 43 turns the transistors 412 and 414 on and off according to the power supply control signal CTL, and maintains the transistors 422 and 424 in the off state. Control signals are supplied to the gates 414, 422 and 424, respectively.
- the communication control unit 43 maintains the transistors 412 and 414 in the off state and the transistors 412 and 424 so that the transistors 422 and 424 are turned on and off according to the power supply control signal CTL. Control signals are supplied to the gates 414, 422, and 424, respectively.
- the transistors 412, 414, 422, and 424 are turned on / off in this manner, so that the load viewed from the power supply apparatus 10 is It changes according to CTL. And the communication part 14 of the electric power feeder 10 detects the change of this load. In this way, the communication unit 40 can transmit the power supply control signal CTL to the power supply apparatus 10.
- the regulator 27 generates DC power having a desired voltage Vreg based on the DC signal supplied from the rectifier circuit 22.
- the secondary battery 31 stores DC power supplied from the regulator 27, and is configured using a rechargeable battery such as a lithium ion battery.
- the electronic circuit 32 receives power supplied from the secondary battery 31 and performs an operation for realizing the function of the electronic device 90.
- the power receiving device 20 receives power supply from the power feeding device 10, transmits a power feeding control signal CTL to the power feeding device 10 by load modulation, and adjusts the power feeding power. Then, the power receiving device 20 charges the secondary battery 31. At that time, the power receiving device 20 selects a circuit to be used from among the modulation circuits 41 and 42 according to the current value of the current Irect. Thereby, in the power receiving device 20, as will be described later, for example, even if the output current Irect changes according to the state of charge of the secondary battery 31, the possibility that an excessive voltage is generated can be reduced. .
- the power receiving coil 211, the capacitive elements 212 and 213, the rectifier circuit 22, the voltage detection unit 24, the control unit 25, and the regulator 27 correspond to a specific example of “power generation unit” in the present disclosure.
- the current detection unit 23 and the communication unit 40 correspond to a specific example of “communication unit” in the present disclosure.
- the transistors 412 and 414 correspond to a specific example of “first switch” in the present disclosure.
- the capacitive elements 411 and 413 correspond to a specific example of “first passive element” in the present disclosure.
- the transistors 422 and 424 correspond to a specific example of “second switch” in the present disclosure.
- the capacitive elements 421 and 423 correspond to a specific example of “second passive element” in the present disclosure.
- the AC / DC converter 11 converts an AC power signal supplied from the AC power source 9 into a DC power signal and supplies the DC power signal to the power transmission driver 12.
- the power transmission driver 12 generates an AC power signal Sp1 having a rectangular waveform based on the DC power supply signal supplied from the AC / DC converter 11 and supplies the power signal Sp1 to the power supply coil 131.
- the feeding coil 131 generates an electromagnetic field based on the power signal Sp1.
- the communication unit 14 communicates with the communication unit 40 of the power receiving device 20 and receives the power supply control signal CTL.
- the control unit 15 controls the transmission driver 12 based on the power supply control signal CTL, and controls the power supplied to the power receiving device 20.
- the power receiving coil 211 generates an induced voltage corresponding to the change in the magnetic flux based on the electromagnetic field generated by the power feeding coil 131.
- the power receiving coil 211 and the capacitive elements 212 and 213 supply the power signal Sp2 corresponding to the power signal Sp1 to the rectifier circuit 22.
- the rectifier circuit 22 rectifies the power signal Sp2 to generate a DC signal having the voltage Vrect.
- the current detection unit 23 detects the output current Irect of the rectifier circuit 22.
- the voltage detector 24 detects the output voltage Vrect of the rectifier circuit 22.
- the control unit 25 generates a power supply control signal CTL based on the output voltage Vrect of the rectifier circuit 22.
- the communication unit 40 communicates with the communication unit 14 of the power supply apparatus 10 and transmits a power supply control signal CTL. Specifically, the communication control unit 43 of the communication unit 40 selects a modulation circuit to be used from among the modulation circuits 41 and 42 based on the current Irect, and the selected modulation circuit performs power supply control signal CTL by load modulation. Send.
- the regulator 27 generates DC power having a desired voltage Vreg based on the DC signal supplied from the rectifier circuit 22.
- the secondary battery 31 stores the DC power supplied from the regulator 27.
- the electronic circuit 32 receives power supplied from the secondary battery 31 and performs an operation for realizing the function of the electronic device 90.
- FIG. 5 shows a flowchart of the power feeding operation of the power feeding system 1.
- the power feeding device 10 feeds power to the power receiving device 20, and periodically communicates between the power feeding device 10 and the power receiving device 20. To adjust the power supply. .
- the details will be described below.
- the power supply device 10 starts to supply power to the power receiving device 20 of the electronic device 90 (step S1).
- the electric power feeder 10 sets electric power feeding low and starts electric power feeding.
- the power receiving device 20 is activated based on the power supplied from the power feeding device 10 (step S2).
- the current detector 23 of the power receiving apparatus detects the output current Irect of the rectifier circuit 22 (step S3).
- the communication control unit 43 of the communication unit 40 determines whether or not the current Irect detected in step S3 is larger than a predetermined threshold value Ith (Irect> Ith) (step S4).
- the predetermined threshold value Ith can be set to 100 [mA], for example.
- step S4 when the current Irect is larger than the predetermined threshold value Ith (Irect> Ith) (“Y” in step S4), the communication control unit 43 selects the modulation circuit 41 having a large capacitance value (step S4). S5).
- step S4 when the current Irect is equal to or smaller than the predetermined threshold value Ith (Irect ⁇ Ith) (“N” in step S4), the communication control unit 43 selects the modulation circuit 42 having a small capacitance value. (Step S6).
- the communication unit 40 communicates with the power supply apparatus 10 using the modulation circuit selected in steps S5 and S6, and adjusts the power supply (step S7). Specifically, first, the control unit 25 of the power receiving device 20 generates a power supply control signal CTL indicating a request for increasing or reducing power supply based on the output voltage Vrect of the rectifier circuit 22. Then, the communication unit 40 transmits a power supply control signal CTL to the power supply apparatus 10. In the power supply apparatus 10, the communication unit 14 receives the power supply control signal CTL, and the control unit 15 controls the power supply frequency fp of the power signal Sp1 generated by the power transmission driver 12 based on the power supply control signal CTL to supply power. Control power. In the communication system 1, for example, such operation is repeated until the voltage Vrect falls within a predetermined voltage range, thereby adjusting the feed power.
- control unit 25 determines whether charging of the secondary battery 31 is completed (step S8). Specifically, the control unit 25 determines whether charging of the secondary battery 31 is completed based on, for example, the voltage or current Iload in the secondary battery 31.
- step S8 If it is determined in step S8 that charging of the secondary battery 31 is not yet completed ("N" in step S8), the process returns to step S3. Then, the operations in steps S3 to S8 are repeated until charging is completed.
- step S8 If it is determined in step S8 that charging of the secondary battery 31 has been completed ("Y" in step S8), the power supply apparatus 10 stops power supply (step S9). Specifically, the control unit 25 of the power receiving device 20 generates a power supply control signal CTL indicating a power supply stop request, and the communication unit 40 transmits the power supply control signal CTL to the power supply device 10. In the power supply apparatus 10, the communication unit 14 receives the power supply control signal CTL, and the control unit 15 stops power supply based on the power supply control signal CTL.
- one of the modulation circuits 41 and 42 is selected according to the output current Irect of the rectifier circuit 22.
- FIG. 6 shows an equivalent circuit of the electronic device 90.
- the impedance Zmod indicates the impedance of the communication unit 40, and one end is connected to one end of the power receiving coil 211 via the capacitive element 212, and the other end is connected to the other end of the power receiving coil 211.
- the impedance Zload indicates the impedance of the circuit after the rectifier circuit 22 as viewed from the input terminal of the rectifier circuit 22, and one end is connected to one end of the power receiving coil 211 via the capacitive element 212, and the other end is the power receiving coil. The other end of 211 is connected.
- the impedances Zmod and Zload are connected in parallel. That is, the power feeding device 10 feels the parallel impedance of the impedances Zmod and Zload as a load.
- the impedance Zload is affected by the circuit after the rectifier circuit 22 and its value changes. That is, for example, when the charge level of the secondary battery 31 is low, the regulator 27 charges the secondary battery 31 with a large current Iload. In this case, since the current Irect is increased, the impedance Zload is decreased. On the other hand, for example, when the charge level of the secondary battery 31 is sufficiently high, the regulator 27 charges the secondary battery 31 with a small current Iload or stops charging. In this case, since the current Irect is reduced, the impedance Zload is increased.
- the value of the impedance Zload varies depending on the state of charge of the secondary battery 31, for example.
- the communication control unit 43 selects one of the modulation circuits 41 and 42 according to the output current Irect of the rectifier circuit 22 as shown in steps S4 to S6 of FIG. In other words, the communication control unit 43 selects one of the modulation circuits 41 and 42 according to the impedance Zload. That is, when the current Irect is larger than the predetermined threshold value Ith, the communication control unit 43 determines that the impedance Zload is small, and selects the modulation circuit 41 having a small impedance Zmod (a capacitance value of the capacitive element is large). (Step S5).
- step S6 when the current Irect is equal to or less than the predetermined threshold value Ith, the communication control unit 43 determines that the impedance Zload is large and performs modulation in which the impedance Zmod is large (capacitance value of the capacitive element is small). The circuit 42 is selected (step S6).
- the power feeding system 1 since one of the modulation circuits 41 and 42 is selected according to the impedance Zload, stable communication can be performed. That is, for example, even if the impedance Zload changes, if one modulation circuit is always used, stable communication may not be possible. Specifically, for example, when the impedance Zmod of the modulation circuit is about the maximum value that can be taken by the impedance Zload, an appropriate modulation degree may not be obtained. That is, since the power supply apparatus 10 feels the parallel impedance of the impedances Zmod and Zload as a load, for example, when the impedance Zload is small (when the load is heavy), the load may not be sufficiently modulated by the modulation circuit. . On the other hand, in the power feeding system 1, since one of the modulation circuits 41 and 42 is selected according to the impedance Zload, an appropriate degree of modulation can be maintained regardless of the value of the impedance Zload. Communication can be performed.
- the voltage in the power receiving device 20 is increased as compared with the power receiving device 20R according to the comparative example shown below. Can be suppressed.
- the power receiving device 20R includes a communication unit 40 ⁇ / b> R including a single modulation circuit 41.
- Other configurations are the same as those in the present embodiment (FIG. 3).
- FIG. 7 shows a configuration example of the communication unit 40R.
- the communication unit 40R includes a modulation circuit 44R and a communication control unit 43R. That is, unlike the communication unit 40 according to the present embodiment, the communication unit 40R has a single modulation circuit 44R.
- the modulation circuit 44R has a configuration similar to that of the modulation circuits 41 and 42 according to the present embodiment, and includes capacitive elements 441 and 443 and transistors 442 and 444.
- the capacitance values of the capacitive elements 441 and 443 are, for example, 24 [nF].
- the communication control unit 43R controls the operation of the modulation circuit 44R so that the transistors 442 and 444 of the modulation circuit 44R are turned on / off according to the power supply control signal CTL. With this configuration, the impedance Zmod of the modulation circuit 44R is about the minimum value that the impedance Zload can take.
- the impedance Zmod of the modulation circuit 44R since the impedance Zmod of the modulation circuit 44R is small, even when the value of the impedance Zload is small (when the load is heavy), the load can be sufficiently modulated by the modulation circuit 44R.
- the output voltage Vrect of the rectifier circuit 22 may increase, for example, due to the harmonics of the power supply signal Sp2, as will be described below.
- FIG. 8 shows the output voltage Vrect of the rectifier circuit 22 at various power supply frequencies fp when the impedance Zload is large.
- the voltage Vrect in the power receiving device 20R during communication and the voltage Vrect in the receiving device 20 during communication and no communication are shown. Note that the voltage Vrect in the receiving device 20R during no communication is substantially the same as the output voltage Vrect of the rectifier circuit 22 in the receiving device 20 during no communication.
- the output voltage Vrect of the rectifier circuit 22 increases in the vicinity of 150 [kHz]. This is because the harmonic frequency of the power supply signal Sp2 is close to the double resonance frequency fres of the power receiving device 20R.
- the multiple resonance frequency fres can be expressed by the following equation.
- L is an inductance value of the power receiving coil 211 (in this example, 20 [ ⁇ H])
- C is a series capacitance value of the capacitive elements 411 and 413 (in this example, 12 [nF])
- k is a feeding coil.
- 131 is a coupling coefficient between the power receiving coil 211 and the power receiving coil 211 (0.7 in this example).
- the double resonance frequency fres is about 455 [kHz] in this example. Therefore, when the frequency of the power supply signal Sp2 is close to 150 [kHz], the frequency of the third harmonic approaches the double resonance frequency fres, so that the output voltage Vrect of the rectifier circuit 22 increases as shown in FIG. End up. Thus, when an excessive voltage is generated in the power receiving device 20, the circuit may be destroyed or the reliability may be deteriorated. In order to reduce such a fear, it is necessary to increase the withstand voltage of the circuit, and for example, the size and cost may increase.
- the power receiving device 20 in the power receiving device 20 according to the present embodiment, two modulation circuits 41 and 42 are provided, and when the impedance Zload is large, the modulation circuit 42 having a large impedance Zmod (a capacitance value of the capacitive element is small) is selected. I did it. Thereby, when the impedance Zload is large, the multiple resonance frequency fres can be changed to a higher frequency. As a result, the power receiving device 20 can reduce the output voltage Vrect of the rectifier circuit 22 during communication as compared to the power receiving device 20R, as shown in FIG. As described above, in the power receiving device 20, the possibility that an excessive voltage is generated can be reduced, so that the possibility that the circuit is broken or the reliability is deteriorated can be reduced.
- the output voltage Vrect of the rectifier circuit 22 can be reduced in this way, so that the feed power can be increased. That is, when increasing the feed power, there are a method of increasing the voltage and a method of increasing the current. However, the method of increasing the voltage can reduce the size of the feed coil 131 and the receiving coil 211, for example. It is more desirable because it can. In this case, since the power receiving device 20 can suppress an increase in voltage due to harmonics, it is possible to increase the power supply by that amount. As a result, in the power feeding system 1, for example, the secondary battery 31 can be charged in a short time.
- one of the modulation circuits 41 and 42 is selected in accordance with the change in the impedance Zload, an appropriate degree of modulation can be maintained, so that stable communication is performed. be able to.
- the communication unit 40 selects one of the modulation circuits 41 and 42 based on the current Irect, but the present invention is not limited to this. Instead of this, for example, one of the modulation circuits 41 and 42 may be selected based on the current Irect and the voltage Vrect as in the electronic device 90A shown in FIG.
- the electronic device 90A includes a power receiving device 20A having a communication unit 40A. 40 A of communication parts communicate with the electric power feeder 10 similarly to the communication part 40 which concerns on the said embodiment, and transmit the electric power feeding control signal CTL by load modulation.
- the communication unit 40 obtains a load power value based on the current Irect and the voltage Vrect, compares the load power value with a predetermined threshold value, and selects one of the modulation circuits 41 and 42. . Even if it does in this way, the effect similar to the said power receiving apparatus 20 can be acquired.
- the communication unit 40 selects one of the modulation circuits 41 and 42 based on the output current Irect of the rectifier circuit 22, but is not limited to this. Instead, for example, one of the modulation circuits 41 and 42 may be selected based on the output current Iload of the regulator 27 as in an electronic device 90B shown in FIG.
- the electronic device 90B includes a power receiving device 20B having a current detection unit 23B.
- the current detection unit 23B detects the output current Iload of the regulator 27 and supplies the detection result to the communication unit 40.
- one of the modulation circuits 41 and 42 may be selected based on the input current of the rectifier circuit 22 as in the electronic device 90C illustrated in FIG.
- the electronic device 90C includes a power receiving device 20C having a current detection unit 23C.
- the current detection unit 23 ⁇ / b> C detects an input current of the rectifier circuit 22, obtains a peak value or RMS (Root Mean Square) value of the input current, and supplies these to the communication unit 40. That is, since the input current of the rectifier circuit 22 is an alternating current, the current detection unit 23C obtains the peak value and the RMS value of the input current. Even if it does in this way, the effect similar to the said power receiving apparatus 20 can be acquired.
- the communication control unit 43 of the communication unit 40 selects one of the modulation circuits 41 and 42, but is not limited to this, and instead of this, for example, the modulation circuit 41, One or both of 42 may be selected.
- the electric power feeding system 1D which concerns on this modification is demonstrated concretely.
- the power feeding system 1D includes a power feeding device 10 and an electronic device 90D having a power receiving device 20D, similarly to the power feeding system 1 (FIG. 1) according to the above embodiment.
- the power receiving device 20D includes a communication unit 40D having a communication control unit 43D, similarly to the power receiving device 20 (FIGS. 3 and 4) according to the above embodiment.
- the communication control unit 43D compares the current value of the current Irect with two predetermined threshold values Ith1 and Ith2 based on the detection result DET.
- the threshold value Ith1 is larger than the threshold value Ith2 (Ith1> Ith2).
- the communication control unit 43D selects one or both of the modulation circuits 41 and 42 based on the comparison result.
- FIG. 12 shows a flowchart of the power feeding operation of the power feeding system 1D.
- the power feeding device 10 starts power feeding (step S1)
- the power receiving device 20D is activated (step S2)
- the current detection unit. 23 detects the current Irect (step S3).
- the communication control unit 43D determines whether or not the current Irect detected in step S3 is larger than a predetermined threshold value Ith1 (Irect> Ith1) (step S11).
- step S11 when the current Irect is larger than the predetermined threshold value Ith1 (Irect> Ith1) (“Y” in step S11), the communication control unit 43D selects both the modulation circuit 41 and the modulation circuit 42. (Step S12).
- step S11 when the current Irect is equal to or smaller than the predetermined threshold value Ith1 (Irect ⁇ Ith1) (“N” in step S11), the communication control unit 43D determines that the current Irect detected in step S3 is the predetermined value. It is determined whether or not the threshold value Ith2 is greater than (Irect> Ith2) (step S13).
- step S13 when the current Irect is larger than the predetermined threshold value Ith2 (Irect> Ith2) (“Y” in step S13), the communication control unit 43D selects the modulation circuit 41 having a large capacitance value (step S13). S14).
- step S13 when the current Irect is equal to or smaller than the predetermined threshold value Ith2 (Irect ⁇ Ith2) (“N” in step S13), the communication control unit 43D selects the modulation circuit 42 having a small capacitance value. (Step S15).
- the communication unit 40 communicates with the power supply apparatus 10 using the modulation circuit selected in steps S12, S14, and S15, and adjusts the power supply (step S7). Then, in the power feeding system 1D, these operations are repeated until charging is completed, similarly to the power feeding system 1 according to the above embodiment. Even if it does in this way, the effect similar to the said power receiving apparatus 20 can be acquired.
- the power supply apparatus 10 adjusts the power supply power by controlling the power supply frequency fp of the power signal Sp1, but the present invention is not limited to this.
- the power supply apparatus Sp1 The feed power may be adjusted by controlling the duty ratio DR.
- the power receiving device 20 can reduce the voltage at each node in the device as described below.
- FIG. 13 shows the output voltage Vrect of the rectifier circuit 22 at various duty ratios DR when the impedance Zload is large.
- FIG. 13 shows the voltage Vrect in the power receiving device 20R during communication and the voltage Vrect in the receiving device 20 during communication and no communication.
- the output voltage Vrect of the rectifier circuit 22 increases in the vicinity of 20 [%] and in the vicinity of 50 [%]. That is, when the duty ratio DR is changed, harmonics change, so the output voltage Vrect of the rectifier circuit 22 also changes. In this example, the voltage Vrect increases when the duty ratio DR is, for example, around 20 [%].
- the modulation circuit 42 having a large impedance Zmod (a capacitance value of the capacitive element is small) is selected.
- the output voltage Vrect of the rectifier circuit 22 can be reduced compared to the power receiving device 20R.
- the voltage at each node in the device can be reduced, so that the possibility that the circuit is broken or the reliability is deteriorated can be reduced.
- the two modulation circuits 41 and 42 are provided, and the capacitance value is changed by selecting one of them.
- the present invention is not limited to this, and instead, for example, a variable value is provided.
- the capacitance value may be changed using a capacitive element.
- FIG. 14 illustrates a configuration example of the communication unit 40E in the power receiving device 20E according to the present modification.
- the communication unit 40E includes a modulation circuit 45E and a communication control unit 43E.
- the modulation circuit 45E includes variable capacitance elements 451 and 453 and transistors 452 and 454.
- the variable capacitance elements 451 and 452 change the capacitance value between both ends based on the voltage input to the control terminal.
- a capacitance value control voltage Vcap1 is supplied from the communication control unit 43E to the control terminal of the variable capacitance element 451, one end is connected to the first input terminal of the rectifier circuit 22, and the other end is connected to the drain of the transistor 452. ing.
- a control signal is supplied to the gate of the transistor 452 from the communication control unit 43E, the drain is connected to the other end of the variable capacitance element 451, and the source is grounded.
- the capacitance control voltage Vcap2 is supplied from the communication control unit 43E to the control terminal of the variable capacitance element 453, one end is connected to the second input terminal of the rectifier circuit 22, and the other end is connected to the drain of the transistor 454. ing.
- a control signal is supplied from the communication control unit 43E to the gate of the transistor 454, the drain is connected to the other end of the variable capacitance element 453, and the source is grounded.
- the communication control unit 43E generates capacitance value control voltages Vcap1 and Vcap2 based on the detection result DET and the power supply control signal CTL, and controls the operation of the modulation circuit 45E.
- the communication control unit 43E has a lookup table (LUT) 46E.
- the look-up table 46E represents the correspondence between the current Irect and the capacitance value control voltages Vcap1 and Vcap2.
- FIG. 15 shows a configuration example of the lookup table 46E.
- the capacitance values of the variable capacitance elements 451 and 453 are shown in place of the capacitance value control voltages Vcap1 and Vcap2.
- the capacitance values of the variable capacitance elements 451 and 453 are associated with each other as the current Irect increases.
- the communication control unit 43E sets the capacitance values of the variable capacitance elements 451 and 453 based on the detection result DET and the lookup table 46E. Thereby, the communication control unit 43E increases the capacitance values of the variable capacitance elements 451 and 453 (decreases the impedance Zmod) as the current Irect is larger (impedance Zload is smaller). Then, the communication control unit 43E turns on and off the transistors 452 and 454 according to the power supply control signal CTL.
- the communication control unit 43E uses the look-up table 46E to change the capacitance values of the variable capacitance elements 451 and 453 stepwise according to the current Irect.
- the communication control unit 43E is limited to this. It is not a thing. Instead of this, the capacitance values of the variable capacitance elements 451 and 453 may be continuously changed according to the current Irect using a function, for example.
- FIG. 16 shows a flowchart of the power feeding operation of the power feeding system 1E.
- the power feeding device 10 starts power feeding (step S1)
- the power receiving device 20E is activated (step S2)
- the current detection unit. 23 detects the current Irect (step S3).
- the communication control unit 43E sets the capacitance values of the variable capacitance elements 451 and 453 based on the current Irect detected in step S3 (step S21). Specifically, the communication control unit 43E generates the capacitance value control voltages Vcap1 and Vcap2 using the lookup table 46E based on the current Irect, and supplies the capacitance value control voltage Vcap1 to the variable capacitance element 451. The capacitance value control voltage Vcap2 is supplied to the variable capacitance element 453. Thereby, the capacitance value between both ends of the variable capacitance elements 451 and 453 is set.
- the communication part 40E communicates with the electric power feeder 10 and adjusts electric power feeding (step S22). And in the electric power feeding system 1E, these operations are repeated until charge is completed similarly to the electric power feeding system 1 which concerns on the said embodiment. Even if it does in this way, the effect similar to the said power receiving apparatus 20 can be acquired.
- the number of parts can be reduced, and therefore the number of terminals can be reduced. That is, the capacitive elements 411, 413, 421, and 423 of the power receiving device 20 and the variable capacitive elements 451 and 453 of the power receiving device 20E are difficult to integrate because they have a capacity of several [nF], and are configured as external parts, for example. Is done. Therefore, the power receiving device 20 requires terminals for connecting to these four capacitive elements 411, 413, 421, and 423. On the other hand, in the power receiving device 20E, since only two variable capacitance elements 451 and 453 are required, the number of terminals can be reduced. Thereby, for example, the power receiving device 20E can be downsized, the layout of the board on which the power receiving device 20E is mounted can be simplified, and the cost can be reduced.
- the load is modulated by the capacitive elements 411, 413, 421, and 423.
- a resistive element such as a communication unit 40F shown in FIG.
- the load may be modulated by 415, 416, 426, 427.
- the communication unit 40F includes modulation circuits 41F and 42F and a communication control unit 43F.
- the modulation circuit 41F includes resistance elements 415 and 416.
- the modulation circuit 42F includes resistance elements 426 and 427.
- the load is modulated by the variable capacitance elements 451 and 453.
- the load is not limited to this, and instead, for example, as in the communication unit 40G illustrated in FIG.
- the load may be modulated by the variable resistance elements 471 and 473.
- the communication unit 40G includes a modulation circuit 47G and a communication control unit 43G.
- the modulation circuit 47G includes variable resistance elements 471 and 473.
- the variable resistance elements 471 and 473 change the resistance value between both ends based on the voltage input to the control terminal.
- the communication control unit 43G controls the operation of the modulation circuit 47G based on the detection result DET and the power supply control signal CTL.
- the communication control unit 43G has a lookup table (LUT) 46G.
- the communication control unit 43 of the communication unit 40 includes two modulation circuits 41 and 42, and one of them is selected.
- the present invention is not limited to this, and instead of this, For example, three or more modulation circuits may be provided, and one of them may be selected.
- the waveform of the power signal Sp1 is rectangular.
- the waveform is not limited to this, and any waveform may be used as long as it has a harmonic component. .
- a power generation unit that generates DC power based on a power signal wirelessly supplied from a power supply device
- a power receiving device comprising: a communication unit configured to set a load of the power signal in accordance with an output current of the power generation unit and modulate the load to communicate with the power supply device.
- the communication unit reduces the impedance of the load when the output current of the power generation unit is large, and increases the impedance of the load when the output current of the power generation unit is small.
- the communication unit A first switch; A first passive element connected in series with the first switch; A second switch; A second passive element connected in series with the second switch; The setting of the load is performed by determining a switch to be turned on / off among the first switch and the second switch according to an output current of the power generation unit.
- the communication unit A switch, The power receiving device according to (1) or (2), further including: a variable passive element that is connected in series with the switch and configured to be capable of changing an element value according to an output current of the power generation unit.
- variable passive element is a variable capacitance element.
- variable passive element is a variable resistance element.
- the power generation unit includes a rectifier circuit that rectifies the power signal, The power receiving device according to any one of (1) to (9), wherein the communication unit sets a load of the power signal based on an output current of the rectifier circuit.
- the power generation unit includes a regulator circuit that generates the DC power, The power receiving device according to any one of (1) to (9), wherein the communication unit sets the load based on an output current of the regulator circuit.
- a power feeding device A power receiving device, and The power receiving device is: A power generation unit that generates DC power based on a power signal supplied wirelessly from the power supply device;
- a power supply system comprising: a communication unit configured to perform communication with the power supply apparatus by setting a load of the power signal according to an output current of the power generation unit and modulating the load.
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Abstract
Description
図1は、一実施の形態に係る給電システムの一構成例を表すものである。給電システム1は、電磁誘導により電力を供給する給電システムである。なお、本開示の一実施の形態に係る受電装置および給電制御方法は、本実施の形態により具現化されるので、併せて説明する。
続いて、本実施の形態の給電システム1の動作および作用について説明する。
まず、図1~4を参照して、給電システム1の全体動作概要を説明する。給電装置10では、AC/DCコンバータ11は、交流電源9から供給される交流電源信号を直流電源信号に変換し、送電ドライバ12に供給する。送電ドライバ12は、AC/DCコンバータ11から供給された直流電源信号に基づいて、矩形波形を有する交流の電力信号Sp1を生成し、その電力信号Sp1を給電コイル131に供給する。給電コイル131は、電力信号Sp1に基づいて電磁界を発生させる。通信部14は、受電装置20の通信部40と通信を行い、給電制御信号CTLを受信する。制御部15は、給電制御信号CTLに基づいて送信ドライバ12を制御し、受電装置20への給電電力を制御する。
図5は、給電システム1の給電動作のフローチャートを表すものである。例えばユーザが、電子機器90を給電装置10の給電面S1上に置くと、給電装置10は、受電装置20に対して給電を行い、給電装置10と受電装置20との間で定期的に通信を行うことにより給電電力を調節する。。以下に、その詳細を説明する。
次に、比較例に係る受電装置20Rについて説明する。受電装置20Rは、単一の変調回路41を含む通信部40Rを有するものである。その他の構成は、本実施の形態(図3)と同様である。
以上のように本実施の形態では、2つの変調回路を設け、インピーダンスZloadが大きい場合には、容量素子の容量値が小さい変調回路を選択するようにしたので、受電装置内に過大な電圧が生じるおそれ低減することができ、回路が破壊され、あるいは、信頼性が劣化するおそれを低減することができる。また、このように各ノードにおける電圧を低減することができるため、給電電力を大きくすることができ、短い時間で2次電池を充電することができる。
上記実施の形態では、通信部40は、電流Irectに基づいて、変調回路41,42のうちの一方を選択したが、これに限定されるものではない。これに代えて、例えば、図9に示す電子機器90Aのように、電流Irectおよび電圧Vrectに基づいて、変調回路41,42のうちの一方を選択してもよい。電子機器90Aは、通信部40Aを有する受電装置20Aを備えている。通信部40Aは、上記実施の形態に係る通信部40と同様に、給電装置10と通信を行い、負荷変調により給電制御信号CTLを送信するものである。その際、通信部40は、電流Irectおよび電圧Vrectに基づいて負荷電力値を求め、その負荷電力値と所定のしきい値とを比較して、変調回路41,42のうちの一方を選択する。このようにしても、上記受電装置20と同様の効果を得ることができる。
上記実施の形態では、通信部40は、整流回路22の出力電流Irectに基づいて、変調回路41,42のうちの一方を選択したが、これに限定されるものではない。これに代えて、例えば、図10に示す電子機器90Bのように、レギュレータ27の出力電流Iloadに基づいて変調回路41,42のうちの一方を選択してもよい。電子機器90Bは、電流検出部23Bを有する受電装置20Bを備えている。この電流検出部23Bは、レギュレータ27の出力電流Iloadを検出し、その検出結果を通信部40に供給するものである。また、例えば、図11に示す電子機器90Cのように、整流回路22の入力電流に基づいて変調回路41,42のうちの一方を選択してもよい。電子機器90Cは、電流検出部23Cを有する受電装置20Cを備えている。この電流検出部23Cは、整流回路22の入力電流を検出し、その入力電流のピーク値やRMS(Root Mean Square)値を求め、これらを通信部40に供給するものである。すなわち、整流回路22の入力電流は交流電流であるため、電流検出部23Cは、この入力電流のピーク値やRMS値を求める。このようにしても、上記受電装置20と同様の効果を得ることができる。
上記実施の形態では、通信部40の通信制御部43は、変調回路41,42のうちの一方を選択したが、これに限定されるものではなく、これに代えて、例えば、変調回路41,42のうちの一方または双方を選択するようにしてもよい。以下に、本変形例に係る給電システム1Dについて具体的に説明する。
上記実施の形態では、給電装置10は、電力信号Sp1の給電周波数fpを制御することにより給電電力を調節したが、これに限定されるものではなく、これに代えて、例えば、電力信号Sp1のデューティ比DRを制御することにより給電電力を調節してもよい。この場合でも、受電装置20では、以下に示すように、装置内の各ノードにおける電圧を低減することができる。
上記実施の形態では、2つの変調回路41,42を設け、これらのうちの一方を選択することにより容量値を変更したが、これに限定されるものではなく、これに代えて、例えば、可変容量素子を用いて容量値を変更してもよい。以下に、本変形例に係る給電システム1Eについて詳細に説明する。
上記実施の形態では、容量素子411,413,421,423により負荷を変調したが、これに限定されるものではなく、これに代えて、例えば図17に示す通信部40Fのように、抵抗素子415,416,426,427により負荷を変調してもよい。通信部40Fは、変調回路41F,42Fと、通信制御部43Fとを有している。変調回路41Fは、抵抗素子415,416を有している。変調回路42Fは、抵抗素子426,427を有している。
前記電力生成部の出力電流に応じて前記電力信号の負荷の設定を行い、その負荷を変調することにより前記給電装置との間で通信を行う通信部と
を備えた受電装置。
前記(2)に記載の受電装置。
第1のスイッチと、
前記第1のスイッチと直列に接続された第1の受動素子と、
第2のスイッチと、
前記第2のスイッチと直列に接続された第2の受動素子と
を有し、
前記電力生成部の出力電流に応じて、前記第1のスイッチおよび前記第2のスイッチのうちのオンオフするスイッチを決定することにより、前記負荷の設定を行う
前記(1)または(2)に記載の受電装置。
前記(3)に記載の受電装置。
前記(3)または(4)に記載の受電装置。
前記(3)または(4)に記載の受電装置。
スイッチと、
前記スイッチと直列に接続され、前記電力生成部の出力電流に応じて素子値を変更可能に構成された可変受動素子と
を備えた
前記(1)または(2)に記載の受電装置。
前記(7)に記載の受電装置。
前記(7)に記載の受電装置。
前記通信部は、前記整流回路の出力電流に基づいて、前記電力信号の負荷の設定を行う
前記(1)から(9)のいずれかに記載の受電装置。
前記(10)に記載の受電装置。
前記通信部は、前記レギュレータ回路の出力電流に基づいて、前記負荷の設定を行う
前記(1)から(9)のいずれかに記載の受電装置。
前記直流電力が供給される回路への電流に応じて前記電力信号の負荷の設定を行い、その負荷を変調することにより前記給電装置との間で通信を行う
受電制御方法。
受電装置と
を備え、
前記受電装置は、
前記給電装置からワイヤレスで供給される電力信号に基づいて直流電力を生成する電力生成部と、
前記電力生成部の出力電流に応じて前記電力信号の負荷の設定を行い、その負荷を変調することにより前記給電装置との間で通信を行う通信部と
を有する
給電システム。
Claims (14)
- 給電装置からワイヤレスで供給される電力信号に基づいて直流電力を生成する電力生成部と、
前記電力生成部の出力電流に応じて前記電力信号の負荷の設定を行い、その負荷を変調することにより前記給電装置との間で通信を行う通信部と
を備えた受電装置。 - 前記通信部は、前記電力生成部の出力電流が大きい場合には前記負荷のインピーダンスが小さくし、前記電力生成部の出力電流が小さい場合には前記負荷のインピーダンスを大きくするように、前記負荷の設定を行う
請求項1に記載の受電装置。 - 前記通信部は、
第1のスイッチと、
前記第1のスイッチと直列に接続された第1の受動素子と、
第2のスイッチと、
前記第2のスイッチと直列に接続された第2の受動素子と
を有し、
前記電力生成部の出力電流に応じて、前記第1のスイッチおよび前記第2のスイッチのうちのオンオフするスイッチを決定することにより、前記負荷の設定を行う
請求項1に記載の受電装置。 - 前記第1の受動素子の素子値は、前記第2の受動素子の素子値と異なる
請求項3に記載の受電装置。 - 前記第1の受動素子および前記第2の受動素子は容量素子である
請求項3に記載の受電装置。 - 前記第1の受動素子および前記第2の受動素子は抵抗素子である
請求項3に記載の受電装置。 - 前記通信部は、
スイッチと、
前記スイッチと直列に接続され、前記電力生成部の出力電流に応じて素子値を変更可能に構成された可変受動素子と
を備えた
請求項1に記載の受電装置。 - 前記可変受動素子は可変容量素子である
請求項7に記載の受電装置。 - 前記可変受動素子は可変抵抗素子である
請求項7に記載の受電装置。 - 前記電力生成部は、前記電力信号を整流する整流回路を有し、
前記通信部は、前記整流回路の出力電流に基づいて、前記電力信号の負荷の設定を行う
請求項1に記載の受電装置。 - 前記通信部は、前記整流回路の出力電圧にも基づいて、前記負荷の設定を行う
請求項10に記載の受電装置。 - 前記電力生成部は、前記直流電力を生成するレギュレータ回路を有し、
前記通信部は、前記レギュレータ回路の出力電流に基づいて、前記負荷の設定を行う
請求項1に記載の受電装置。 - 給電装置からワイヤレスで供給される電力信号に基づいて直流電力を生成し、
前記直流電力が供給される回路への電流に応じて前記電力信号の負荷の設定を行い、その負荷を変調することにより前記給電装置との間で通信を行う
給電制御方法。 - 給電装置と、
受電装置と
を備え、
前記受電装置は、
前記給電装置からワイヤレスで供給される電力信号に基づいて直流電力を生成する電力生成部と、
前記電力生成部の出力電流に応じて前記電力信号の負荷の設定を行い、その負荷を変調することにより前記給電装置との間で通信を行う通信部と
を有する
給電システム。
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US15/119,176 US10298064B2 (en) | 2014-02-24 | 2015-02-10 | Power receiving unit, power feeding control method, and feed system |
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US20170012470A1 (en) | 2017-01-12 |
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