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WO2018185810A1 - Système d'alimentation électrique sans contact - Google Patents

Système d'alimentation électrique sans contact Download PDF

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Publication number
WO2018185810A1
WO2018185810A1 PCT/JP2017/013930 JP2017013930W WO2018185810A1 WO 2018185810 A1 WO2018185810 A1 WO 2018185810A1 JP 2017013930 W JP2017013930 W JP 2017013930W WO 2018185810 A1 WO2018185810 A1 WO 2018185810A1
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WO
WIPO (PCT)
Prior art keywords
power
circuit
voltage
current
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/013930
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English (en)
Japanese (ja)
Inventor
三菱電機照明株式会社
岳秋 飯田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Mitsubishi Electric Lighting Corp
Original Assignee
Mitsubishi Electric Corp
Mitsubishi Electric Lighting Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp, Mitsubishi Electric Lighting Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2017/013930 priority Critical patent/WO2018185810A1/fr
Priority to JP2019510509A priority patent/JP6884201B2/ja
Publication of WO2018185810A1 publication Critical patent/WO2018185810A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • 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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to a non-contact power supply system that supplies power to a light source by non-contact power supply.
  • a power feeding device that feeds power in a non-contact manner to a power receiving device is provided with an inverter circuit, and by controlling the drive frequency and conduction ratio (duty ratio) of the inverter circuit, There has been proposed one that varies the power to be supplied (see, for example, Patent Document 1).
  • a dimming function that varies the brightness of the light source is required. For this reason, when power is supplied from an AC power source to a light source in a non-contact manner, it is necessary to vary the power supply in a wide range.
  • Patent Document 1 when the technique described in Patent Document 1 is applied to a power supply device that supplies power to a light source, it is necessary to greatly change the drive frequency and duty ratio of the inverter circuit in order to vary the power supply in a wide range. There is a problem that loss increases. In addition, there is a problem in that transmission efficiency at the time of dimming is reduced due to switching loss, and heat is generated.
  • the present invention has been made to solve the above-described problems, and in a non-contact power feeding system that supplies power to a light source by non-contact power feeding, switching loss when changing the power output from the power feeding device to the light source. It is possible to obtain a non-contact power feeding system that can reduce power consumption.
  • a contactless power supply system includes a first rectifier circuit that rectifies AC power input from an AC power supply, a DC converter circuit that converts an output of the first rectifier circuit into an arbitrary DC voltage, and the DC converter.
  • a power supply apparatus comprising: an inverter circuit that converts the DC voltage output from the circuit into high-frequency power; a first coil that is supplied with the high-frequency power output from the inverter circuit; and a control unit that controls the DC conversion circuit.
  • a second coil that receives the high-frequency power from the first coil, a second rectifier circuit that rectifies the high-frequency power received by the second coil, and an output of the second rectifier circuit to an arbitrary direct current
  • a power receiving device having a current control circuit for converting and outputting to a light source, wherein the inverter circuit has a switching element and a resonance circuit, and has a preset frequency and
  • the control unit is configured by a resonant inverter in which the switching element is driven with a duty ratio, and the control unit varies the DC voltage of the DC conversion circuit to change the power output from the power receiving device to the light source. is there.
  • the inverter circuit is constituted by a resonance type inverter, and the DC voltage of the DC conversion circuit is varied to change the power output from the power receiving device to the light source. For this reason, the switching loss at the time of changing the electric power output to a light source from an electric power feeder can be reduced.
  • FIG. 1 is a block diagram showing a non-contact power feeding system according to Embodiment 1 of the present invention.
  • the non-contact power feeding system includes a power feeding device 1 and a power receiving device 2.
  • the power feeding device 1 converts AC power input from the AC power source 3 into high frequency AC power and supplies the power to the power feeding coil 11 to transmit power in a non-contact manner.
  • the power receiving device 2 receives power from the power feeding device 1 in a non-contact manner by the power receiving coil 21 and outputs the power to the LED 22 that is a load.
  • the power receiving device 2 performs dimming control that varies the brightness of the LED 22 by adjusting the current supplied to the LED 22.
  • FIG. 2 is a circuit diagram showing a power feeding device of the non-contact power feeding system according to Embodiment 1 of the present invention.
  • the power feeding device 1 includes a power feeding coil 11, a DC conversion circuit 12, a resonant inverter 13, a power feeding side control unit 14, a power feeding side communication unit 15, a power feeding side rectifier circuit 16, and an input.
  • a filter 17 and a capacitor 18 are provided.
  • the input filter 17 reduces high frequency components superimposed on the current input from the AC power supply 3.
  • the input filter 17 includes a coil 171 and a capacitor 172.
  • the coil 171 is connected in series to the AC power supply 3.
  • One end of the coil 171 is connected to one end of the AC power supply 3, and the other end of the coil 171 is connected to the capacitor 172 and the power supply side rectifier circuit 16.
  • the power supply side rectifier circuit 16 is disposed between the input filter 17 and the DC converter circuit 12.
  • the power supply side rectifier circuit 16 has a function of converting an AC voltage supplied from the AC power supply 3 into a DC voltage.
  • the power supply side rectifier circuit 16 is configured by, for example, a diode bridge in which four diodes are combined. Note that the configuration of the power supply side rectifier circuit 16 is not limited to this, and a MOSFET (Metal Oxide Semiconductor-Field Effect Transistor) which is a unidirectional conducting element may be combined.
  • MOSFET Metal Oxide Semiconductor-Field Effect Transistor
  • the capacitor 18 smoothes the output voltage of the power supply side rectifier circuit 16.
  • the DC conversion circuit 12 is disposed between the capacitor 18 and the resonant inverter 13.
  • the DC conversion circuit 12 converts the output voltage of the power supply side rectifier circuit 16 smoothed by the capacitor 18 into an arbitrary DC voltage.
  • the DC conversion circuit 12 is configured by, for example, a boost chopper circuit.
  • the DC conversion circuit 12 that is a step-up chopper circuit includes a MOSFET 121 that is a switching element, a coil 122, and a diode 123.
  • flow conversion circuit 12 it can comprise with circuits, such as a step-up / step-down chopper circuit, a flyback circuit, a fly forward circuit, a SEPIC, a Zeta converter, a Cuk converter, other than a step-up chopper circuit.
  • MOSFET 121 The drain of MOSFET 121 is connected to coil 122 and diode 123 on the positive electrode side of the DC bus.
  • the source of MOSFET 121 is connected to capacitor 18 and smoothing capacitor 124 on the negative electrode side of the DC bus.
  • the gate of the MOSFET 121 is connected to the power supply side control unit 14.
  • a control signal output from the power supply side control unit 14 is input to the gate of the MOSFET 121, and on / off control is performed.
  • Coil 122 is arranged between capacitor 18 and MOSFET 121 on the positive electrode side of the DC bus. One end of the coil 122 is connected to one end of the capacitor 18, and the other end of the coil 122 is connected to the MOSFET 121 and the diode 123.
  • the diode 123 is disposed between the MOSFET 121 and the smoothing capacitor 124 on the positive electrode side of the DC bus.
  • the anode of the diode 123 is connected to the coil 122 and the MOSFET 121.
  • the cathode of the diode 123 is connected to the smoothing capacitor 124.
  • the DC conversion circuit 12 boosts the output voltage of the power supply side rectifier circuit 16 by the MOSFET 121 being turned on and off, and outputs the boosted voltage to the smoothing capacitor 124. Further, by performing the control described later, it is possible to provide a function of reducing the harmonics of the input current and improving the power factor.
  • the smoothing capacitor 124 is disposed between the output of the DC conversion circuit 12 and the resonant inverter 13 on the DC bus. One end of the smoothing capacitor 124 is connected to the positive side of the DC bus, and the other end of the smoothing capacitor 124 is connected to the negative side of the DC bus. The smoothing capacitor 124 smoothes the output voltage of the DC conversion circuit 12.
  • the resonance inverter 13 is disposed between the DC conversion circuit 12 and the feeding coil 11.
  • the resonant inverter 13 converts the DC voltage output from the DC conversion circuit 12 into high frequency power of several MHz.
  • the resonant inverter 13 is configured by, for example, a current resonance type class E inverter.
  • the resonant inverter 13 includes a switching element 131, a capacitor 132, a capacitor 133, and a coil 134.
  • the configuration of the resonant inverter 13 is not limited to this, and other known circuit configurations can be applied.
  • One end of the capacitor 132 is connected to the positive side of the DC bus, and the other end of the capacitor 132 is connected to the negative side of the DC bus.
  • One end of the switching element 131 is connected to the capacitor 132 and the capacitor 133 on the positive electrode side of the DC bus.
  • the other end of the switching element 131 is connected to the capacitor 132 and the feeding coil 11 on the negative electrode side of the DC bus.
  • the capacitor 133 is disposed between the switching element 131 and the coil 134 on the positive electrode side of the DC bus.
  • the coil 134 is connected between the capacitor 133 and the feeding coil 11 on the positive electrode side of the DC bus.
  • the resonant inverter 13 converts the output voltage of the DC conversion circuit 12 into high-frequency AC power by controlling the switching element 131 on and off. In addition, when outputting to the feeding coil 11, the resonant inverter 13 outputs a high-frequency alternating current exceeding several MHz while suppressing an increase in switching loss by using the resonance of the coil 134 and the capacitors 132 and 133. be able to.
  • the feeding coil 11, the coil 134, the capacitor 132, and the capacitor 133 constitute a resonance circuit.
  • the switching element 131 is driven at a preset frequency and duty ratio. Thereby, switching of the switching element 131 is performed at the timing when the current generated by the resonance phenomenon of the resonance circuit becomes zero. Such switching is called soft switching.
  • the resonant inverter 13 is a voltage resonance type inverter, switching is performed at a timing when the voltage becomes zero.
  • a MOSFET made of silicon can be used.
  • GaN-HEMT made of gallium nitride can be used instead of MOSFET.
  • the feeding coil 11 is connected to the output of the resonant inverter 13.
  • the feeding coil 11 has a configuration in which a conducting wire is wound on the same plane.
  • the feeding coil 11 is supplied with high-frequency power output from the resonant inverter 13.
  • the power feeding coil 11 is magnetically coupled to the power receiving coil 21.
  • the power feeding coil 11 is magnetically coupled to the power receiving coil 21 to transmit the high frequency power output from the resonant inverter 13 to the power receiving device 2 in a non-contact manner.
  • a non-contact power transmission method any one of a magnetic resonance method, an electric field resonance method, and an electromagnetic induction method can be used.
  • the power supply side control unit 14 includes a control circuit 141, a voltage detection circuit 142, and a calculation unit 143.
  • the voltage detection circuit 142 detects the voltage of the smoothing capacitor 124. That is, the voltage detection circuit 142 detects the output voltage of the DC conversion circuit 12.
  • the voltage detection circuit 142 is configured by, for example, a voltage dividing circuit using resistors.
  • the voltage dividing circuit is applied to the smoothing capacitor 124 by connecting one end of a series resistor, in which resistors are connected in series, to the positive side DC bus and connecting the other end of the series resistor to the negative side DC bus. It is a circuit that divides the applied voltage.
  • the voltage detection circuit 142 only needs to be configured to detect the voltage of the smoothing capacitor 124, and any sensor can be used.
  • the information regarding the target value of the electric power made to output to LED22 which is a light source from the power receiving apparatus 2 is input into the calculating part 143.
  • the computing unit 143 determines the target value of the output voltage of the DC conversion circuit 12 according to the information regarding the target value of power.
  • the control circuit 141 controls ON / OFF of the switching element 131 of the resonant inverter 13 at a preset frequency and duty ratio.
  • the control circuit 141 controls the on / off of the MOSFET 121 so that the output voltage of the DC conversion circuit 12 becomes a target value of the output voltage determined by the calculation unit 143.
  • the power supply side control unit 14 can be realized by hardware such as a circuit device, or can be realized as software executed on an arithmetic device such as a microcomputer or CPU.
  • the power supply side communication unit 15 receives the information regarding the target value of power transmitted from the power receiving device 2. The received information is input to the power supply side control unit 14.
  • the power supply side communication unit 15 is configured by a wireless communication interface that conforms to an arbitrary communication standard such as a wireless LAN, Bluetooth (registered trademark), infrared communication, NFC (Near Field Communication), and the like.
  • the power supply side rectifier circuit 16 corresponds to the “first rectifier circuit” in the present invention.
  • the resonant inverter 13 corresponds to an “inverter circuit” in the present invention.
  • the feeding coil 11 corresponds to a “first coil” in the present invention.
  • the power supply side communication unit 15 corresponds to the “first communication unit” in the present invention.
  • the power supply side control unit 14 corresponds to a “control unit” in the present invention.
  • FIG. 3 is a waveform showing the operation of the DC conversion circuit of the non-contact power feeding system according to Embodiment 1 of the present invention.
  • the vertical axis in FIG. 3 indicates the input current of the AC power supply 3, the current flowing through the coil 122, the drain voltage of the MOSFET 121, and the gate voltage of the MOSFET 121 in order from the top, and the horizontal axis indicates time.
  • the cycle of turning on and off the gate voltage of the MOSFET 121 is shown to be longer than actual.
  • the MOSFET 121 When the ON time set by the control circuit 141 elapses, the MOSFET 121 is turned off, and a closed circuit is formed by the coil 122, the diode 123, and the smoothing capacitor 124. As a result, the current in the coil 122 decreases, the energy accumulated in the coil 122 is released, and the smoothing capacitor 124 is charged.
  • control circuit 141 turns on the MOSFET 121 again. Control in which switching is performed at a timing when the current of the coil 122 becomes zero is called current critical mode control.
  • the current flowing through the coil 122 has a triangular waveform, and the apex thereof has a sine wave envelope as indicated by a dotted line.
  • the current input from the AC power supply 3 is smoothed by the input filter 17, and an average value of the current flowing through the coil 122 is input, resulting in a sinusoidal current waveform. Therefore, the power factor is improved.
  • control circuit 141 performs feedback control so that the output voltage of the DC conversion circuit 12 detected by the voltage detection circuit 142 follows the target value of the output voltage determined by the calculation unit 143.
  • the feedback control response time is set so that the loop gain of the feedback control is not less than 1/2 of one cycle of the AC power supply 3 and not more than 1 (0 dB).
  • the frequency is set to be 1 (0 dB) or less at a frequency 2 times or less of the frequency of the AC power supply 3.
  • the loop gain of the constant voltage feedback control is set to 1 (0 dB) or less at a frequency of 100 Hz or less corresponding to a half cycle (half wave), that is, a cycle of 10 msec or more.
  • the constant voltage feedback control is set so as not to respond in a cycle shorter than 1 ⁇ 2 of the power cycle.
  • the same effect can be obtained by setting the update period of the on-time of the MOSFET 121 to half the period of the AC power supply 3 or a period longer than half.
  • FIG. 4 is a circuit diagram showing a power receiving device of the non-contact power feeding system according to Embodiment 1 of the present invention.
  • the power receiving device 2 includes a power receiving coil 21, a power receiving side rectifier circuit 23, a current control circuit 24, a power receiving side control unit 25, a power receiving side communication unit 26, and a current sensor 27. .
  • the power receiving coil 21 has a configuration in which a conducting wire is wound on the same plane.
  • the power receiving coil 21 is magnetically coupled to the power feeding coil 11.
  • the power receiving coil 21 receives the high frequency power transmitted from the power feeding coil 11 of the power feeding device 1.
  • the power receiving coil 21 outputs the high frequency power transmitted from the power feeding coil 11 to the power receiving side rectifier circuit 23.
  • the power receiving side rectifier circuit 23 is disposed between the power receiving coil 21 and the current control circuit 24.
  • the power receiving side rectifier circuit 23 rectifies the high frequency power received by the power receiving coil 21 and outputs the rectified power to the current control circuit 24.
  • the power receiving side rectifier circuit 23 includes a coil 231, diodes 232a, 232b, 232c, and 232d, and capacitors 233a, 233b, 233c, and 233d.
  • the power receiving side rectifier circuit 23 is configured by a resonant rectifier circuit.
  • the power-receiving-side rectifier circuit 23 can rectify the received high-frequency power with a small switching loss by appropriately setting the resonance frequency of the capacitor and coil even with high-frequency AC power exceeding several MHz.
  • the current control circuit 24 controls the current flowing through the LED 22 that is a load.
  • the current control circuit 24 converts the DC voltage output from the power receiving side rectifier circuit 23 into a DC current that can be input to the LED 22.
  • the current control circuit 24 is configured by, for example, a step-down chopper circuit.
  • the current control circuit 24 includes a MOSFET 241, a coil 244, a diode 243, a capacitor 242, and a smoothing capacitor 245.
  • the current control circuit 24 can be configured by a step-down chopper circuit, a step-up / step-down chopper circuit, a flyback circuit, a flyforward circuit, a SEPIC, a Zeta converter, a Cuk converter, and the like.
  • One end of the capacitor 242 is connected to the positive side of the DC bus, and the other end of the capacitor 242 is connected to the negative side of the DC bus.
  • MOSFET 241 is arranged on the positive electrode side of the DC bus.
  • the drain of the MOSFET 241 is connected to the capacitor 242.
  • the source of the MOSFET 241 is connected to the diode 243 and the coil 244.
  • a control signal output from the power receiving side control unit 25 is input to the gate of the MOSFET 241 to perform on / off control.
  • the cathode of the diode 243 is connected to the MOSFET 241 and the coil 244.
  • the anode of the diode 243 is connected to the smoothing capacitor 245 and the capacitor 242.
  • the smoothing capacitor 245 smoothes the current output to the LED 22.
  • the current sensor 27 detects a current flowing through the LED 22 and transmits a signal related to the detection result to the power receiving side control unit 25.
  • Examples of the current sensor 27 include a configuration using a hall sensor in addition to a configuration using a shunt resistor.
  • the LED 22 that is a load of the power receiving device 2 is configured by, for example, an LED group in which a plurality of LEDs are directly connected. One end of the LED group is connected to the positive side of the DC bus, and the other end of the LED group is connected to the negative side of the DC bus.
  • the power receiving side control unit 25 includes a control circuit 251, a voltage detection circuit 252, a current detection circuit 253, and a power calculation unit 254.
  • the voltage detection circuit 252 detects a voltage applied to the LED 22.
  • the current detection circuit 253 detects the current flowing through the LED 22.
  • the power calculation unit 254 calculates the output power of the LED 22 based on the detection results of the voltage detection circuit 252 and the current detection circuit 253.
  • the control circuit 251 outputs a signal for on / off control of the MOSFET 241 of the current control circuit 24 based on the detection result of the current detection circuit 253.
  • the power receiving side communication unit 26 performs wireless communication with the power feeding side communication unit 15.
  • the power receiving side communication unit 26 transmits information related to a target value of power to be output from the power receiving device 2 to the LED 22 that is a light source.
  • the power receiving side communication unit 26 is configured by a wireless communication interface conforming to an arbitrary communication standard such as a wireless LAN, Bluetooth (registered trademark), infrared communication, NFC (Near Field Communication).
  • the power receiving coil 21 corresponds to a “second coil” in the present invention.
  • the power receiving side rectifier circuit 23 corresponds to a “second rectifier circuit” in the present invention.
  • the power receiving side communication unit 26 corresponds to the “second communication unit” in the present invention.
  • the voltage detection circuit 252 corresponds to a “voltage sensor” in the present invention.
  • FIG. 5 is a waveform showing the operation of the current control circuit of the non-contact power feeding system according to Embodiment 1 of the present invention.
  • the vertical axis of FIG. 5 indicates the current flowing through the LED 22, the current flowing through the coil 244, and the control signal (gate voltage) of the MOSFET 241 in order from the top, and the horizontal axis indicates time.
  • the current flowing through the coil 244 has a triangular waveform, but the current output to the LED 22 is smoothed by the smoothing capacitor 245 and the average value of the current flowing through the coil 244 is output.
  • this method is a control method for obtaining a desired output by adjusting the ON period. Since the ratio of the ON time Ton to the switching period Tsw is called duty, this method is called duty control.
  • the power receiving side control unit 25 stores in advance the target value of the output current output from the current control circuit 24 to the LED 22 in accordance with the dimming rate.
  • the power receiving side control unit 25 includes, for example, a recording unit therein, and stores a target value of output current for a plurality of dimming rates.
  • the power receiving side control part 25 acquires the information of the light control rate input from the light control switch (not shown), for example. And the power receiving side control part 25 sets the target value of the output current of LED22 according to the acquired dimming rate.
  • the setting of the target value of the output current is not limited to this.
  • the power receiving side control unit 25 may acquire information on the dimming rate from an external device via the power receiving side communication unit 26 and set the target value of the output current.
  • the dimming rate information may be numerical information in the range of 0 to 100%, for example, with the rated output of the LED 22 being 100% and the extinction being 0%, or dark, normal, bright, etc.
  • a plurality of identification information corresponding to the size may be used.
  • the power receiving side control unit 25 outputs a signal for on / off control of the MOSFET 241 of the current control circuit 24 based on the current of the LED 22 detected by the current sensor 27.
  • the resonant inverter 13 of the power supply device 1 performs a soft switching operation at a fixed frequency and a fixed duty. For this reason, in order to vary the output power of the power receiving device 2 according to the dimming of the LED 22, control is performed to vary the output voltage of the DC conversion circuit 12. Details of the operation of the DC conversion circuit 12 during dimming will be described with reference to FIGS.
  • FIG. 6 is a flowchart showing the operation of the non-contact power feeding system according to Embodiment 1 of the present invention.
  • FIG. 7 is an example of operation waveforms of the non-contact power feeding system according to Embodiment 1 of the present invention.
  • the vertical axis in FIG. 7 indicates the output voltage of the DC conversion circuit 12, the output current of the resonant inverter 13, and the output power of the LED 22 in order from the top, and the horizontal axis indicates time.
  • the power receiving side control unit 25 of the power receiving device 2 determines whether or not the dimming rate has been changed (S001).
  • the power receiving side control unit 25 sets the target of the output current of the LED 22 according to the dimming rate. Set the value.
  • the power calculation unit 254 of the power receiving side control unit 25 obtains a target value of the power output to the LED 22 from the target value of the output current of the LED 22.
  • the target value of power may be obtained from the detection result of the voltage detection circuit 252 and the target value of current, or the actual measurement value of current power based on the detection results of the current detection circuit 253 and the voltage detection circuit 252 and the current value. You may obtain
  • the power receiving side communication part 26 transmits the information regarding the target value of the electric power output to LED22 to the electric power feeder 1 (S002).
  • the target value of the power itself may be used, or the target value of the current may be used by regarding the LED 22 as a constant voltage load.
  • the information on the dimming rate may be regarded as information on the target value of the power output to the LED 22.
  • the power supply side communication unit 15 of the power supply apparatus 1 receives the information regarding the target value of the power of the LED 22 transmitted from the power reception side communication unit 26.
  • the calculation unit 143 of the power supply side control unit 14 sets the target value of the output voltage of the DC conversion circuit 12 according to the information regarding the target value of the power of the LED 22 (S003).
  • the calculation unit 143 stores in advance the target value of the output voltage of the DC conversion circuit 12 in correspondence with the target value of the power of the LED 22.
  • the calculation unit 143 includes a recording unit therein, and stores the target value of the output voltage of the DC conversion circuit 12 for a plurality of target values of power.
  • the target value of the output voltage of the DC conversion circuit 12 is set higher as the target value of the power of the LED 22 is larger.
  • the control circuit 141 controls on / off of the MOSFET 121 so that the output voltage of the DC conversion circuit 12 becomes the target value of the output voltage determined by the calculation unit 143. Thereafter, the process returns to step S001, and the above operation is repeated.
  • the output power of the LED 22 is set to P1 and the output voltage of the DC conversion circuit 12 is set to V1.
  • the output current of the resonant inverter 13 becomes I1.
  • the target value of the power of the LED 22 is increased from P1 to P2 from time t1 to time t2
  • the output voltage of the DC conversion circuit 12 is increased from V1 to V2.
  • the output current of the resonant inverter 13 increases from I1 to I2.
  • the output voltage of the DC conversion circuit 12 is decreased from V2 to V1.
  • the output current of the resonant inverter 13 decreases from I2 to I1.
  • the power supply side control unit 14 sets the target value of the output voltage of the DC conversion circuit 12 higher as the power of the LED 22 is larger. For this reason, since the output current of the resonant inverter 13 increases as the output voltage of the DC converter circuit 12 increases, the power output from the power feeding device 1 can be increased. Moreover, the power supply side control part 14 sets the target value of the output voltage of the DC converter circuit 12 so that the electric power of LED22 is small. For this reason, since the output current of the resonant inverter 13 becomes smaller as the output voltage of the DC converter circuit 12 becomes lower, the power output from the power feeding device 1 can be reduced.
  • the resonant inverter 13 includes a switching element and a resonant circuit, and is configured by a resonant inverter in which the switching element is driven with a preset frequency and duty ratio.
  • the power supply side control unit 14 varies the DC voltage of the DC conversion circuit 12 to change the power output from the power receiving device 2 to the light source. For this reason, the switching loss at the time of changing the electric power output from the power receiving apparatus 2 to LED22 can be reduced. Therefore, a decrease in transmission efficiency during dimming can be suppressed, and heat generation of the switching element can be suppressed.
  • the power supply side control unit 14 switches the switching element at the timing when the current becomes zero or the voltage becomes zero, which is generated by the resonance phenomenon of the resonance circuit. With such soft switching, it is possible to reduce switching loss when changing the power output from the power receiving device 2 to the LED 22.
  • the power supply side control unit 14 receives information on the target value of power to be output from the power receiving apparatus 2 to the LED 22, and the DC conversion circuit 12 has the information on the target value of power. Variable DC voltage. For this reason, the electric power which the electric power feeder 1 outputs can be set according to the electric power of LED22.
  • the electric power feeding side control part 14 makes the DC voltage of the DC converter circuit 12 high, so that the target value of the electric power of LED22 is large. For this reason, the electric power which the electric power feeder 1 outputs can be set according to the electric power of LED22.
  • the present invention is not limited to this.
  • the current value of the LED 22 may be transmitted instead of the power consumed by the LED 22.
  • the LED 22 When the LED 22 is connected as a load of the power receiving device 2, the LED 22 can be regarded as a constant voltage load. Therefore, by storing information on the voltage at the time of lighting of the LED 22 in the power supply side control unit 14 of the power supply device 1 in advance, the information on the current of the LED 22 transmitted from the power receiving device 2 can be used. In the power supply side control unit 14, the output power of the LED 22 can be estimated. In this case, the power receiving side control unit 25 in the power receiving device 2 does not require the power calculating unit 254 that calculates the power from the current and voltage of the LED 22, and can have a simpler configuration. Cost can be increased.
  • Embodiment 2 a configuration in which a plurality of power receiving devices 2 are provided for one power feeding device 1 will be described.
  • the same parts as those in the first embodiment are denoted by the same reference numerals, and the difference from the first embodiment will be mainly described.
  • FIG. 8 is a block diagram showing a non-contact power feeding system according to Embodiment 2 of the present invention.
  • the non-contact power feeding system includes a power feeding device 1, a power receiving device 2A, and a power receiving device 2B.
  • the power feeding device 1 converts AC power input from the AC power source 3 into high-frequency AC power and supplies the power to the feeding coil 11 to transmit power in a non-contact manner.
  • the power receiving device 2A receives power from the power feeding device 1 in a non-contact manner by the power receiving coil 21A, and outputs the power to the LED 22A that is a load.
  • the power receiving device 2A performs dimming control that varies the brightness of the LED 22A by adjusting the current supplied to the LED 22A.
  • the power receiving device 2B receives power from the power feeding device 1 in a non-contact manner by the power receiving coil 21B, and outputs the power to the LED 22B that is a load. Further, the power receiving device 2B performs dimming control that varies the brightness of the LED 22B by adjusting the current supplied to the LED 22B.
  • the configuration of power reception devices 2A and 2B is the same as that of power reception device 2 described in the first embodiment.
  • the power receiving device 2 In the second embodiment, two examples of the power receiving device 2 are shown, but three or more power receiving devices 2 may be used.
  • FIG. 9 is a flowchart showing the operation of the non-contact power feeding system according to Embodiment 2 of the present invention.
  • FIG. 10 is an example of operation waveforms of the non-contact power feeding system according to Embodiment 2 of the present invention.
  • the vertical axis in FIG. 10 is the sum of the output voltage of the DC conversion circuit 12, the output current of the resonant inverter 13, the output power Pa of the LED 22A, the output power Pb of the LED 22B, the output power Pa and the output power Pb in order from the top.
  • the electric power Psum is shown, and the horizontal axis shows time.
  • FIG. 9 shows, referring FIG.
  • the power receiving side control unit 25 of the power receiving devices 2A and 2B determines whether or not the dimming rate is changed (S011). When there is a change in the dimming rate (S001: YES), the power receiving side communication unit 26 of the power receiving apparatus 2A transmits information regarding the target value of the power output to the LED 22A to the power feeding apparatus 1. In addition, the power receiving side communication unit 26 of the power receiving device 2B transmits information related to the target value of the power output to the LED 22B to the power feeding device 1 (S012).
  • the power feeding side communication unit 15 of the power feeding device 1 receives information regarding the target values of the power of the LEDs 22A and 22B transmitted from the power receiving device 2A and the power receiving device 2B, respectively.
  • the calculation unit 143 of the power supply side control unit 14 calculates the total power Psum by summing the target values of power to the LEDs 22A and 22B transmitted from the power receiving devices 2A and 2B (S013).
  • the calculation unit 143 of the power supply side control unit 14 sets the target value of the output voltage of the DC conversion circuit 12 according to the total power Psum (S014).
  • the calculation unit 143 stores in advance a target value of the output voltage of the DC conversion circuit 12 corresponding to the total power Psum.
  • the calculation unit 143 includes a recording unit therein, and stores a target value of the output voltage of the DC conversion circuit 12 for a plurality of values of the total power Psum.
  • the target value of the output voltage of the DC conversion circuit 12 is set higher as the total power Psum is larger.
  • the control circuit 141 controls on / off of the MOSFET 121 so that the output voltage of the DC conversion circuit 12 becomes the target value of the output voltage determined by the calculation unit 143. Thereafter, the process returns to step S011, and the above-described operation is repeated.
  • the output voltage of the DC conversion circuit 12 is V1 with respect to the total power Psum1 that is the sum of the output power Pa1 of the LED 22A and the output power Pb2 of the LED 22B.
  • the output current of the resonant inverter 13 becomes I1.
  • the target value of the power of the LED 22A is increased from Pa1 to Pa2 from time t1 to t2
  • the total power increases from Psum1 to Psum2
  • the output voltage of the DC conversion circuit 12 changes from V1 to V2.
  • the output current of the resonant inverter 13 increases from I1 to I2.
  • the output voltage of the DC conversion circuit 12 is decreased from V2 to V1. .
  • the output current of the resonant inverter 13 decreases from I2 to I1.
  • the power supply side control unit 14 sets the target value of the output voltage of the DC conversion circuit 12 higher as the total power Psum increases. For this reason, since the output current of the resonant inverter 13 increases as the output voltage of the DC converter circuit 12 increases, the power output from the power feeding device 1 can be increased. Further, the power supply side control unit 14 sets the target value of the output voltage of the DC conversion circuit 12 to be lower as the total power Psum is smaller. For this reason, since the output current of the resonant inverter 13 becomes smaller as the output voltage of the DC converter circuit 12 becomes lower, the power output from the power feeding device 1 can be reduced.
  • the second embodiment includes a plurality of power receiving devices 2.
  • the power supply side communication unit 15 receives information related to the target value of power from each of the plurality of power receiving apparatuses 2, and the power supply side control unit 14 determines the DC conversion circuit 12 according to the sum of the target values of the plurality of powers. Variable DC voltage. For this reason, the some power receiving apparatus 2 can light-control LED22 which is each load separately. Moreover, even if it is a case where the electric power which each power receiving apparatus 2 outputs fluctuates because the some power receiving apparatus 2 dimmes separately, the increase in switching loss can be suppressed.
  • the power feeding side control unit 14 increases the DC voltage of the DC conversion circuit 12 as the total power target value increases. For this reason, according to the electric power which each of the some power receiving apparatus 2 outputs, the electric power which the electric power feeder 1 outputs can be set.
  • Embodiment 3 an operation when the DC voltage of the DC conversion circuit 12 falls below a preset lower limit value will be described.
  • the same parts as those in the second embodiment are denoted by the same reference numerals, and the difference from the second embodiment will be mainly described.
  • the power supply side control unit 14 stops the operation of the resonant inverter 13 when the DC voltage falls below a preset lower limit value Vlim.
  • FIG. 11 is a flowchart showing the operation of the non-contact power feeding system according to Embodiment 3 of the present invention.
  • FIG. 12 is an example of operation waveforms of the non-contact power feeding system according to Embodiment 3 of the present invention.
  • the vertical axis in FIG. 12 is the sum of the output voltage of the DC conversion circuit 12, the output current of the resonant inverter 13, the output power Pa of the LED 22A, the output power Pb of the LED 22B, the output power Pa and the output power Pb in order from the top.
  • the electric power Psum is shown, and the horizontal axis shows time.
  • FIG. 11 it demonstrates, referring FIG.
  • steps S021 to S024 are the same as steps S011 to S014 in the second embodiment.
  • step S024 the control circuit 141 of the power supply side control unit 14 compares the DC voltage of the DC conversion circuit 12 detected by the voltage detection circuit 142 with a preset lower limit value Vlim (S025). When the DC voltage is equal to or higher than the lower limit value Vlim (S025: YES), the control circuit 141 continues the operation of the resonant inverter 13 (S026). Thereafter, the process returns to step S021, and the above-described operation is repeated.
  • the control circuit 141 stops the operation of the resonant inverter 13 (S027). Thereby, the non-contact power feeding operation from the power feeding device 1 to the power receiving devices 2A and 2B is stopped. Thereafter, the process returns to step S021, and the above-described operation is repeated.
  • the output voltage of the DC conversion circuit 12 is V1 with respect to the total power Psum that is the sum of the output power Pa of the LED 22A and the output power Pb of the LED 22B.
  • the output voltage V1 of the DC conversion circuit 12 is also gradually decreased.
  • the control circuit 141 stops the operation of the resonant inverter 13. Thereby, after time t2, the output power Pa of the LED 22A and the output power Pb of the LED 22B become zero.
  • the power supply side control unit 14 performs the operation of the resonant inverter 13 when the DC voltage is lower than the preset lower limit value Vlim. Stop. For this reason, the operation
  • Embodiment 4 FIG. In the fourth embodiment, an operation for correcting the output voltage of the DC conversion circuit 12 will be described.
  • the same parts as those in the first to third embodiments are denoted by the same reference numerals, and differences from the first to third embodiments will be mainly described.
  • FIG. 13 is a circuit diagram showing a power receiving device of the non-contact power feeding system according to Embodiment 4 of the present invention.
  • the power reception side control unit 25 of the power reception device 2 includes an LED current determination unit 255 in addition to the configuration of the first embodiment.
  • the LED current determination unit 255 acquires information on the actual value of the current flowing through the LED 22 detected by the current sensor 27. The LED current determination unit 255 determines whether the measured value of the current flowing through the LED 22 exceeds the target value, and transmits the determination result from the power receiving side communication unit 26. Other configurations are the same as those of the first embodiment. Further, similarly to the second embodiment, a plurality of power receiving devices 2 may be provided. In the following description, a configuration including the power receiving devices 2A and 2B will be described.
  • FIG. 14 is a flowchart showing the operation of the non-contact power feeding system according to Embodiment 4 of the present invention.
  • FIG. 15 is an example of operation waveforms of the non-contact power feeding system according to Embodiment 4 of the present invention.
  • the vertical axis in FIG. 15 indicates the output voltage of the DC conversion circuit 12, the output current of the resonant inverter 13, the output current Ia of the LED 22A, the output power Pa of the LED 22A, the output current Ib of the LED 22B, and the output power Pb of the LED 22B in order from the top.
  • the determination result (error signal) of the LED current determination unit 255 is shown, and the horizontal axis indicates time.
  • description will be made with reference to FIG. 15 based on each step of FIG.
  • steps S031 to S034 are the same as steps S011 to S014 in the second embodiment.
  • the LED current determination unit 255 of the power receiving device 2A compares the detection value of the current sensor 27 with a preset LED current target value Ia_ref.
  • the LED current determination unit 255 of the power receiving device 2B compares the detection value of the current sensor 27 with a preset LED current target value Ib_ref (S035).
  • the LED current target value is a value determined according to the target value of the power supplied to the LED 22. That is, the LED current target value is set so that the power becomes the target value when the LED 22 is regarded as a constant voltage load and the LED current target value is supplied.
  • the LED current determination unit 255 receives a determination result of turning on an error signal indicating that a desired current is not obtained. The data is transmitted to the side communication unit 26 (S036).
  • the power feeding side communication unit 15 receives the error signal transmitted from the power receiving device 2 and inputs the error signal to the power feeding side control unit 14.
  • the calculation unit 143 of the power supply side control unit 14 receives the error signal, and when a predetermined time elapses, the output voltage target is set to be higher by the correction value ⁇ V than the previously stored target value of the output voltage of the DC conversion circuit 12. The value is corrected (S037). Thereafter, the process returns to step S031, and the above operation is repeated.
  • the LED current determination unit 255 does not transmit an error signal. Thereby, the DC conversion circuit 12 holds the target value of the output voltage (S038). Thereafter, the process returns to step S031, and the above operation is repeated.
  • the output voltage of the DC conversion circuit 12 is added by the correction value ⁇ Vpfc at time t2. Further, the output current of the resonant inverter 13 increases from I2 to I3. After the time t2, the output current Ia of the LED 22a becomes the LED current target value Ia_ref, and the error signal from the LED current determination unit 255 is stopped.
  • the detection value of the current sensor 27 is compared with the LED current target value has been described, but the present invention is not limited to this.
  • An actual measurement value of the power of the LED 22 may be calculated from the detection value of the current sensor 27 and the detection value of the voltage detection circuit 252, and the actual measurement value of the power may be compared with a target value of the power of the LED 22.
  • the power supply side control unit 14 varies the DC voltage of the DC conversion circuit 12 according to the target value of the power of the LED 22, and then when the measured value of the power of the LED 22 is lower than the target value of the power, the DC conversion circuit 12.
  • a configuration for increasing the direct current voltage of may be used.
  • the DC voltage of the DC conversion circuit 12 is increased.
  • the power receiving apparatuses 2A and 2B when a desired current cannot be output to the LED 22, it can be corrected to increase the output voltage of the DC conversion circuit 12, and the current of the desired LED 22A and 22B can be changed. Can be output.
  • the power output from the resonant inverter 13 may not be sufficient with the output voltage of the DC conversion circuit 12 determined in advance. is there. In such a case, a desired current may not be output in the power receiving devices 2A and 2B, but a desired current can be output to the LED 22 by the operation of the fourth embodiment.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Dc-Dc Converters (AREA)

Abstract

La présente invention concerne un système d'alimentation électrique sans contact comportant: un dispositif d'alimentation électrique doté d'un circuit de conversion à courant continu servant à convertir la sortie d'un premier circuit redresseur vers une tension continue souhaitée, un circuit onduleur servant à convertir la tension continue délivrée par le circuit de conversion à courant continu en une alimentation à haute fréquence, et une première bobine à laquelle l'alimentation à haute fréquence délivrée par le circuit onduleur est fournie; et un dispositif de réception d'alimentation doté d'une seconde bobine servant à recevoir l'alimentation à haute fréquence provenant de la première bobine, un second circuit redresseur servant à redresser l'alimentation à haute fréquence reçue par la seconde bobine, et un circuit de commande de courant servant à convertir la sortie du second circuit redresseur en un courant continu souhaité et à délivrer le courant continu à une source lumineuse. Le circuit onduleur est constitué d'un onduleur de type à résonance dans lequel un élément de commutation est excité à une fréquence et un facteur de marche spécifiés à l'avance. L'unité de commande fait varier la tension continue du circuit de conversion à courant continu et modifie la puissance délivrée du dispositif de réception d'alimentation à la source lumineuse.
PCT/JP2017/013930 2017-04-03 2017-04-03 Système d'alimentation électrique sans contact Ceased WO2018185810A1 (fr)

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CN116316784A (zh) * 2023-04-17 2023-06-23 青岛鼎信通讯股份有限公司 一种适用于低压柔性互济设备的通信方法

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