JP4631870B2 - Secondary power receiving circuit for contactless power supply equipment - Google Patents

Description

  The present invention relates to a secondary power receiving circuit of a contactless power supply facility.

An example of a secondary power receiving circuit of a conventional contactless power supply facility is disclosed in Patent Document 1.
As shown in FIG. 4 (a), the secondary power receiving circuit of the non-contact power feeding facility disclosed in Patent Document 1 is inducted to oppose the primary induction line 1 for passing a high-frequency current of about 10 kHz, for example. A pickup coil 2 in which electromotive force is induced from the line 1 is provided, and the electromotive force induced in the pickup coil is supplied to a load 10 whose power consumption varies.

  The secondary power receiving circuit is connected in series to the pickup coil 2 and is connected in parallel to the resonant capacitor 3 that forms the resonant circuit 4 that resonates with the frequency of the induction line 1 (in series), and the resonant circuit 4. A rectifier circuit (full-wave rectifier circuit) 6 formed by four first diodes 6 a that rectifies the voltage generated by the circuit 4, and a current limiting coil having one end connected to the positive output terminal of the rectifier circuit 6 7 and one end connected to the other end of the current limiting coil 7, the other end connected to the negative output end of the rectifier circuit 6, and a voltage capacitor (output capacitor) connected in parallel to the load 10 8 is provided.

Below, the effect | action in the structure of the said secondary side power receiving circuit is demonstrated.
For example, when a high frequency current of about 10 kHz is supplied to the induction line 1, an induced electromotive force is generated in the pickup coil 2 by the magnetic flux generated in the induction line 1, and is output from the resonance circuit 4 to which the pickup coil 2 is connected. The current is rectified by the rectifier circuit 6, and the voltage capacitor 8 is charged by the current output from the rectifier circuit 6 and supplied to the load 10.
JP 11-178104 A

However, in the secondary power receiving circuit of the conventional contactless power supply facility, as shown in FIG. 4A, the first diode from the load 10 side at the moment when the polarity of the voltage applied to the rectifier circuit 6 is switched. A recovery current i _R flows through 6a, a high voltage is instantaneously generated at both ends of the pickup coil 2, and an oscillating voltage is subsequently generated. That is, assuming that the inductance of the pickup coil 2 is L, the recovery current i _R is i, and the recovery time is t, the voltage _VL induced in the pickup coil 2 is
V _L = L (di / dt)
Shown by the formula, because the recovery time t is shorter in units of ns, the voltage V _L which is induced in the pickup coil 2 when the recovery current i _R flows in a high voltage (e.g., 1000v).

  Thus, every time the polarity of the voltage applied to the rectifier circuit 6 is switched, as shown in FIG. 4B, the voltage V of the resonant circuit 4 becomes a high voltage, and an oscillating voltage is generated. There has been a problem that the voltage and vibration voltage become large noises that affect the load 10 and the surrounding environment, and that parts that can withstand the high voltage must be prepared.

  Therefore, the present invention provides a secondary power receiving circuit of a contactless power supply facility including a rectifier circuit formed of a diode. The contactless power supply facility 2 can suppress noise generated by a recovery current flowing through the diode. The object is to provide a secondary power receiving circuit.

  In order to achieve the above-described object, the invention described in claim 1 of the present invention is provided with a pickup coil in which an electromotive force is induced from the induction line facing a primary side induction line through which a high-frequency current flows. A secondary power receiving circuit of a contactless power supply facility that supplies an electromotive force induced in the coil to a load whose power consumption varies, and is a resonance that is connected in series to the pickup coil and resonates with the frequency of the induction line A resonant capacitor that forms a circuit; a rectifier circuit that is connected in parallel to the resonant circuit and rectifies a voltage generated by the resonant circuit; and a voltage capacitor that is connected in parallel to the load; Is connected to one output end of the rectifier circuit, and the other end is connected in parallel to the resonance circuit and a current limiting coil connected to the connection point of the voltage capacitor and the load. And a second diode having an anode connected to an intermediate point of the clamp coil and a cathode connected to a connection point of the current limiting coil and the voltage capacitor. Is.

  According to the above configuration, when a high frequency current is supplied to the induction line, an induced electromotive force is generated in the pickup coil due to the magnetic flux generated in the induction line, and the current output from the resonance circuit to which the pickup coil is connected is Rectified by the rectifier circuit and supplied to the load. In addition, at the moment when the polarity of the voltage applied to the rectifier circuit is switched, a recovery current flows through the first diode, and a high voltage is instantaneously generated at both ends of the resonance circuit to which the pickup coil is connected. The voltage of the circuit is clamped to the voltage of the voltage capacitor to which the clamp coil and the second diode are connected, that is, half the DC voltage applied to the load, and noise generated from the resonance circuit is suppressed. It is done.

  Further, the invention according to claim 2 is provided with a plurality of pickup coils in which an electromotive force is induced from the induction line facing the primary induction line through which a high-frequency current flows, and the electromotive force induced in these pickup coils is A secondary-side power receiving circuit of a non-contact power supply facility that supplies power to a load whose power consumption fluctuates, and a resonance capacitor that is connected in series to each of the pickup coils and forms a resonance circuit that resonates with the frequency of the induction line; A switching means connected in series between each of the resonance circuits, and a switching means for connecting or releasing each resonance circuit; and a parallel connection to each of the resonance circuits to rectify a voltage generated by the resonance circuit; A rectifier circuit composed of a diode, a voltage capacitor connected in parallel to the load, and one end connected to a connection point where one output terminal of each rectifier circuit is connected. A current limiting coil whose other end is connected to the connection point of the voltage capacitor and the load, a voltage control means for controlling an output voltage applied to the load by controlling the switching means, The clamp coil connected to both ends of the resonance circuit group connected by the switching means, the anode is connected to the intermediate point of the clamp coil, and the cathode is connected to the connection point of the current limiting coil and the voltage capacitor. The second diode is provided.

  According to the above configuration, when a high-frequency current is supplied to the induction line, an induced electromotive force is generated in each pickup coil by the magnetic flux generated in the induction line, and is output from the resonance circuit to which each pickup coil is connected. The current is rectified by each rectifier circuit and supplied to the load. When this load is in the normal load state, the resonance circuits are connected by the switching means connected in series between the resonance circuits, and the voltage generated in the rectifier circuit of each resonance circuit is added to the load as a voltage. Supplied. In addition, when the load becomes light load, the output voltage rises, and according to the state, the switching means between the resonance circuits is selected by the voltage control means, the selected switching means is opened, and the separated resonance The voltage generated in the rectifier circuit of the resonance circuit other than the circuit is supplied to the load. Also, at the moment when the polarity of the voltage applied to each rectifier circuit is switched, a recovery current flows through the first diode, and a high voltage is instantaneously generated at both ends of each resonance circuit connected to the pickup coil. The voltages of these resonance circuits are clamped to a voltage of a voltage capacitor to which the clamp coil and the second diode are connected, that is, a voltage half of the DC voltage applied to the load, and are generated from these resonance circuits. Noise can be suppressed.

  The invention according to claim 3 is the invention according to claim 2, wherein the switching means includes a transformer in which a primary winding is connected in series between the resonance circuits, and the transformer. A rectifier connected to the secondary winding of the rectifier and switching means connected between the output terminals of the rectifier, the voltage control means by connecting the switching means to the open state The output voltage applied to the load is controlled.

  According to the above configuration, when the load is in a normal load state, the switching means of each switching means is turned on, the resonance circuits are connected in series, and when the load is in a light load state, it is selected by the voltage control means. The switching means of the selected switching means is turned off, and the resonance circuit is disconnected by the selected switching means.

  The secondary side power receiving circuit of the contactless power supply facility of the present invention has a recovery current flowing through the first diode at the moment when the polarity of the voltage applied to the rectifier circuit is switched, and at both ends of the resonance circuit to which the pickup coil is connected. Although a high voltage is about to be generated instantaneously, the voltage of this resonance circuit is half the voltage of the voltage capacitor connected to the clamping coil and the second diode, that is, the DC voltage applied to the load. By being clamped to the voltage of, noise generated from the resonance circuit can be suppressed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the structure same as the circuit structure demonstrated in the column of background art, and description is abbreviate | omitted.
[Embodiment 1]
FIG. 1 is a circuit configuration diagram of a secondary power receiving circuit of a contactless power supply facility according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the secondary power receiving circuit of the non-contact power supply equipment includes a pickup coil 2 in which an electromotive force is induced from the induction line 1 facing the primary induction line 1 that flows a high-frequency current of about 10 kHz, for example. And the electromotive force induced in the pickup coil 2 is supplied to the load 10 whose power consumption varies.

  The secondary power receiving circuit includes a resonant capacitor 3 that forms a series resonant circuit 4, a rectifier circuit (full-wave rectifier circuit) 6 that is formed by four first diodes 6a, a current limiting coil 7, a voltage A switch (an example of switching means) 9 that includes a capacitor (output capacitor) 8 and is newly connected in series between the resonant circuit 4 and the rectifier circuit 6; a voltage controller (an example of voltage control means) 13; A clamping coil 21 connected in parallel to the resonance circuit 4, and a second diode 22 whose anode is connected to the intermediate tap 21 a of the clamping coil 21 and whose cathode is connected to the positive side end of the voltage capacitor 8. I have.

Voltage controller 13 controls the output voltage V _DC applied to the load 10 by controlling the switch 9, that detects the output voltage V _DC, the output voltage V _DC is at a predetermined voltage or less, the switch 9 When the voltage exceeds a predetermined voltage, the switch 9 is turned off and opened.

Below, the effect | action in the structure of the said secondary side power receiving circuit is demonstrated.
For example, when a high frequency current of about 10 kHz is supplied to the induction line 1, an induced electromotive force is generated in the pickup coil 2 by the magnetic flux generated in the induction line 1, and is output from the resonance circuit 4 to which the pickup coil 2 is connected. The rectified current is rectified by the rectifier circuit 6 and supplied to the load 10. When the load 10 is in a normal load state, the switch 9 is turned on by the voltage controller 13, and the output current of the rectifier circuit 6 is supplied to the voltage capacitor 8 and the load 10. Further, when the load 10 is in a light load state, the output voltage _VDC increases, and the switch 9 is turned off by the voltage controller 13 according to the state, and the output current of the rectifier circuit 6 is supplied to the voltage capacitor 8 and the load 10. The voltage is supplied from the voltage capacitor 8 to the load 10, and the output voltage _VDC gradually decreases and is maintained at a predetermined voltage.

Further the moment of switching the polarity of the voltage applied to the first diode 6a in the rectifier circuit 6 is, recovery current i _R flows through the first diode 6a, the high voltage across the resonant circuit 4 pickup coil 2 is connected, Although the resonance circuit 4 is to be generated instantaneously, one end of the resonance circuit 4 is connected to the voltage capacitor 8 through a half (half) of the clamping coil 21 and the second diode 22. As a result, the voltage across the resonance circuit 4 is clamped to one half of the DC voltage _VDC applied to the load 10, and generation of high voltage and vibration voltage is suppressed. Noise is reduced.

According to the first embodiment as described above, a simple circuit configuration, it is possible to prevent the occurrence of noise due to the recovery current i _R flowing through the first diode 6a that forms a rectifying circuit 6, can improve the surrounding environment, the respective components (resonance capacitor 3, the first diode 6a, etc.) which the high voltage is applied by the generation of high voltage by the recovery current i _R is prevented can be set lower the breakdown voltage of, be inexpensive parts it can.
[Embodiment 2]
FIG. 2 is a circuit configuration diagram of the secondary power receiving circuit of the contactless power supply facility according to Embodiment 2 of the present invention.

  As shown in FIG. 2, the secondary power receiving circuit of the contactless power supply facility is a first pickup in which an electromotive force is induced from the induction line 1 so as to face the primary induction line 1 that flows a high-frequency current of about 10 kHz, for example. A coil 2A and a second pickup coil 2B are provided, and an electromotive force induced in the first pickup coil 2A and the second pickup coil 2B is supplied to a load 10 whose power consumption varies.

The secondary power receiving circuit includes a first capacitor 3A and a second capacitor 3B that are connected in series to the pickup coils 2A and 2B, respectively, and that form resonance circuits 4A and 4B that resonate with the frequency of the induction line 1, and each resonance circuit. 4A and 4B are connected in series, and are connected in parallel to the switching circuit 5 (an example of switching means) 5 that connects or opens the resonance circuits 4A and 4B, and the resonance circuits 4A and 4B, respectively. Rectifier circuits 6A and 6B that rectify the current output from the circuits 4A and 4B, a voltage capacitor 8 that is connected in parallel to the load 10, and a connection in which one end is connected to the positive output terminal of each of the rectifier circuits 6A and 6B. The output power applied to the load 10 by controlling the switching circuit 5 and the current limiting coil 7 which is connected to the point and whose other end is connected to the connection point of the voltage capacitor 8 and the load 10. Controlling the V _DC, i.e. detects the output voltage V _DC, the resonant circuit 4A output voltage V _DC is the switching circuit 5 is at a predetermined voltage or lower, between 4B and a connected state, the switching circuit 5 exceeds the predetermined voltage A voltage controller (an example of voltage control means) 13 that opens between the resonance circuits 4A and 4B, and a clamping coil 21 connected in parallel to both ends of the resonance circuits 4A and 4B connected by the switching circuit 5 And a second diode 22 having an anode connected to the intermediate tap 21a of the clamping coil 21 and a cathode connected to the positive terminal of the voltage capacitor 8. Further, a connection point connecting the negative output terminals of the rectifier circuits 6A and 6B is connected to the negative terminal of the voltage capacitor 8.

  The switching circuit 5 includes a transformer 31 having a primary winding connected in series between the resonance circuits 4A and 4B, and a rectifier 32 having input ends connected to both ends of the secondary winding of the transformer 31. The diode 11 whose anode is connected to the positive output terminal of the rectifier 32 and the cathode is connected to the positive terminal of the voltage capacitor 8 and the output terminal of the rectifier 32, that is, the collector and emitter are the outputs of the rectifier 32. It is composed of an output adjustment transistor (switching means) 12 connected between the ends.

The voltage controller 13 detects the output voltage V _DC, the output voltage V _DC is turned on the output adjusting transistor 12 when more than a predetermined voltage, turns off the output adjusting transistor 12 exceeds a predetermined voltage.

The operation in the second embodiment will be described.
When the load 10 consumes predetermined power consumption in a normal load state, the output adjustment transistor 12 is turned on, and the secondary winding of the transformer 31 is short-circuited, whereby the primary winding of the transformer 31 is short-circuited. And the resonance circuits 4A and 4B are connected. Therefore, the resonance circuits 4A and 4B are connected in series. At this time, the output voltage V _DC is equal to or lower than a predetermined voltage, and a voltage obtained by adding the output voltages of the rectifier circuits 6A and 6B is applied to the load 10.

When the load 10 decreases and the output voltage V _DC increases, the voltage controller 13 turns off the output adjustment transistor 12 when it is determined that the increased output voltage V _DC exceeds a predetermined voltage. The inductance of the primary winding of the transformer 31 is inserted between the resonance circuits 4A and 4B, and the resonance circuits 4A and 4B are opened. Thus, when the load 10 is in a light load state, when the output adjustment transistor 12 is turned off, the resonance circuits 4A and 4B are disconnected and the rectifier circuit 6A and the rectifier circuit 6B are connected in parallel. The voltage applied to the load 10 is reduced by half. Then, the output voltage V _DC decreases, and the output voltage V _DC is maintained at a predetermined voltage.

Further, at the moment when the polarity of the voltage applied to the first diode 6a is switched in each of the rectifier circuits 6A and 6B, the recovery current i _R flows through the first diode 6a, and the resonant circuits 4A and 4B to which the pickup coils 2A and 2B are connected. A high voltage is instantaneously generated at both ends of 4B, but one end of the group of resonance circuits 4A and 4B is connected to the voltage capacitor 8 via the half (half) of the clamping coil 21 and the second diode 22. , The voltage between both ends of the resonance circuits 4A and 4B is clamped to a voltage that is half the DC voltage _VDC applied to the load 10, and generation of high voltage and vibration voltage is suppressed. Therefore, noise generated from the resonance circuits 4A and 4B is suppressed. Note that when the resonance circuits 4A and 4B are disconnected, the voltage applied to the load 10 decreases to a half of the normal value. Therefore, when the recovery current i _R flows through the first diode 6a, Half of that is clamped at a normal quarter voltage.

According to the second embodiment as described above, a simple circuit configuration, it is possible to prevent the rectifier circuit 6A, the generation of noise due to the recovery current i _R flowing through the first diode 6a that forms a 6B, improve the surrounding environment can also the parts (resonance capacitor 3, the first diode 6a, etc.) which the high voltage is applied by the generation of high voltage by the recovery current i _R is prevented can be set low breakdown voltage of the inexpensive components be able to.

In the second embodiment, two resonance circuits 4A and 4B and rectifier circuits 6A and 6B, one switching circuit 5, a clamping coil 21 and a second diode 22 are provided. A single or a plurality of sets of one resonance circuit 4A, 4B and rectifier circuits 6A, 6B, one switching circuit 5, a clamping coil 21 and a second diode 22 "are provided, and one voltage capacitor is provided by the plurality of sets. 8 and the load 10 may be configured to supply power.
[Embodiment 3]
FIG. 3 is a circuit configuration diagram of the secondary power receiving circuit of the non-contact power feeding facility according to Embodiment 3 of the present invention.

  In the third embodiment, a resonance circuit 4C formed of a third pickup coil 2C and a third capacitor 3C is further connected in series to the resonance circuits 4A and 4B of the second embodiment, and the primary side of the transformer 41 This is a secondary power receiving circuit having a configuration in which the winding is connected in a state of being insulated between the resonance circuits 4 (between the resonance circuit 4A and the resonance circuit 4B and between the resonance circuit 4B and the resonance circuit 4C). In the following, description will be given focusing on the differences from the second embodiment. The resonant circuit 4C is connected in parallel with a rectifier circuit 6C that rectifies the current output from the resonant circuit 4C and supplies power to the load 10 whose power consumption fluctuates in the same manner as the other resonant circuits 4A and 4B. Yes. The clamping coil 21 is connected in parallel to both ends of the resonance circuits 4A, 4B, 4C connected by the switching circuit 5.

  As shown in FIG. 3, the switching circuit 5 includes a transformer 41 having a primary winding connected in series between the resonance circuit 4A and the resonance circuit 4B, and between the resonance circuit 4B and the resonance circuit 4C, A rectifier 42 whose input end is connected to the secondary side of 41, a diode 11 whose anode is connected to the plus side output end of the rectifier 42, and whose cathode is connected to the plus side end of the voltage capacitor 8; The output adjusting transistor (switching means) 12 is connected between the two output terminals, that is, the collector and the emitter are connected to the output terminal of the rectifier 42.

The voltage controller 13 detects the output voltage V _DC, the output voltage V _DC is turned on the output adjusting transistor 12 when more than a predetermined voltage, turns off the output adjusting transistor 12 exceeds a predetermined voltage.

Hereinafter, the operation of the second embodiment will be described.
When the load 10 is consuming predetermined power consumption in the normal load state, the output adjustment transistor 12 is turned on, the secondary winding of the transformer 41 is short-circuited, and between the resonance circuits 4A and 4B and between the resonance circuits 4B and 4C. A connection state is established, and a voltage obtained by adding the output voltages of the rectifier circuits 6A, 6B, and 6C is applied to the load 10.

Here, when the load 10 decreases, the output voltage V _DC increases, and the voltage controller 13 determines that the increased output voltage V _DC exceeds a predetermined voltage, it turns off the output adjustment transistor 12. As described above, when the load 10 is in a light load state, the output adjustment transistor 12 is turned off, and the inductance of the primary winding of the transformer 41 is inserted between the resonance circuits 4A and 4B and between the resonance circuits 4B and 4C. Therefore, the resonance circuits 4A, 4B, and 4C are disconnected, and the voltage applied to the load 10 is reduced to the voltage generated in the resonance circuit 4A (the voltage generated in each resonance circuit 4A, 4B, and 4C). Are reduced to 1/3 when the two are the same). Then, the output voltage V _DC decreases, and the output voltage V _DC is maintained at a predetermined voltage.

Further, at the moment when the polarity of the voltage applied to the first diode 6a is switched in each rectifier circuit 6A, 6B, 6C, the recovery current i _R flows through the first diode 6a, and the pickup coils 2A, 2B, 2C are connected. A high voltage is instantaneously generated at both ends of the resonance circuits 4A, 4B, and 4C. One end of each of the resonance circuits 4A, 4B, and 4C is half (1/2) of the clamping coil 21 and the second diode 22. The voltage of the resonance circuits 4A, 4B, and 4C is clamped to a voltage half that of the DC voltage _VDC applied to the load 10 by being connected to the voltage capacitor 8 via Further, generation of oscillating voltage is suppressed, and therefore noise generated from the resonance circuits 4A, 4B, and 4C is suppressed. Note that when the resonance circuits 4A, 4B, and 4C are disconnected, the voltage applied to the load 10 is reduced to one-third of the normal voltage. Therefore, when the recovery current i _R flows through the first diode 6a, Half of that is clamped to a normal 1/6 voltage.

According to the third embodiment as described above, a simple circuit arrangement, the rectifier circuit 6A, 6B, it is possible to prevent the occurrence of noise due to the recovery current i _R flowing through the first diode 6a that forms a 6C, the surrounding environment can improve, and each part (resonance capacitor 3, the first diode 6a, etc.) which the high voltage is applied by the generation of high voltage by the recovery current i _R is prevented can be set lower the withstand voltage of, inexpensive components It can be.

  In the third embodiment, three resonant circuits 4A, 4B, 4C and rectifier circuits 6A, 6B, 6C, one switching circuit 5, a clamping coil 21 and a second diode 22 are provided. The same “three resonance circuits 4A, 4B, 4C and rectifier circuits 6A, 6B, 6C and one switching circuit 5, a clamping coil 21 and a second diode 22” are separately provided as a single or a plurality of sets. It is also possible to supply power to one voltage capacitor 8 and load 10 by the combination of

In the second and third embodiments, the switching circuit 5 is composed of the transformers 31 and 41, the rectifiers 32 and 42, the output adjustment transistor 12 and the diode 11, but the switching circuit 5 is operated by the voltage controller 13. It can also be configured by a switch. When the voltage controller 13 determines that the output voltage _VDC has exceeded the predetermined voltage, the voltage controller 13 turns off the switch to disconnect the resonance circuits 4A, 4B, and 4C.

It is a circuit diagram of the secondary side receiving circuit of the non-contact electric power supply equipment in Embodiment 1 of this invention. It is a circuit diagram of the secondary side receiving circuit of the non-contact electric power supply equipment in Embodiment 2 of this invention. It is a circuit diagram of the secondary side power receiving circuit of the non-contact electric power supply equipment in Embodiment 3 of this invention. It is the circuit diagram of the secondary side power receiving circuit of the conventional non-contact electric power supply equipment, and the wave form diagram for demonstrating a subject.

Explanation of symbols

1 Inductive line 2, 2A, 2B, 2C Pickup coil 3, 3A, 3B, 3C Capacitor (resonance capacitor)
4, 4A, 4B, 4C Resonant circuit 5 Switching circuit 6, 6A, 6B, 6C Rectifier circuit 6a First diode 7 Current limiting coil 8 Voltage capacitor (output capacitor)
9 Switch (switching means)
10 Load 11 Diode 12 Output adjustment transistor (switching means)
13 Voltage controller (voltage control means)
21 Clamping coil 21a Intermediate tap 22 Second diode 31, 41 Transformer 32, 42 Rectifier

Claims (3)

A non-contact power supply that provides a pickup coil in which an electromotive force is induced from the induction line facing a primary induction line through which a high-frequency current flows, and supplies the electromotive force induced in the coil to a load whose power consumption varies. A secondary power receiving circuit of the equipment,
A resonant capacitor connected in series with the pickup coil to form a resonant circuit that resonates with the frequency of the induction line;
A rectifier circuit comprising a first diode connected in parallel to the resonant circuit and rectifying a voltage generated by the resonant circuit;
A voltage capacitor connected in parallel to the load;
A current limiting coil having one end connected to one output end of the rectifier circuit and the other end connected to a connection point of the voltage capacitor and the load;
A clamping coil connected in parallel to the resonant circuit;
A secondary side of a contactless power supply facility, comprising: a second diode having an anode connected to an intermediate point of the clamping coil and a cathode connected to a connection point of the current limiting coil and the voltage capacitor. Power receiving circuit. There is provided a plurality of pickup coils in which an electromotive force is induced from the induction line facing the primary induction line through which a high-frequency current flows, and the electromotive force induced in these pickup coils is supplied to a load whose power consumption varies. A secondary power receiving circuit of a contact power supply facility,
A resonant capacitor connected in series to each of the pickup coils to form a resonant circuit that resonates with the frequency of the induction line;
Switching means connected in series between each of the resonance circuits, and between the resonance circuits to be connected or open;
A rectifier circuit comprising a first diode connected in parallel to each of the resonant circuits and rectifying a voltage generated by the resonant circuit;
A voltage capacitor connected in parallel to the load;
A current limiting coil having one end connected to a connection point connecting one output terminal of each rectifier circuit and the other end connected to a connection point of the voltage capacitor and the load;
Voltage control means for controlling the output voltage applied to the load by controlling the switching means;
A clamping coil connected to both ends of a resonance circuit group connected by the switching means;
A secondary side of a contactless power supply facility, comprising: a second diode having an anode connected to an intermediate point of the clamping coil and a cathode connected to a connection point of the current limiting coil and the voltage capacitor. Power receiving circuit. The switching means is
A transformer in which a primary winding is connected in series between the resonance circuits;
A rectifier connected to the secondary winding of the transformer;
Switching means connected between both output ends of the rectifier,
The said voltage control means controls the output voltage applied to the said load by connecting the said switching means with an open state, The secondary side power receiving of the non-contact electric power supply equipment of Claim 2 characterized by the above-mentioned. circuit.

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