JP2015162972A - power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device which can suppress an increased loss in a period when contact charging is performed.SOLUTION: An electric path from the junction side of a first and a second switching element 16a, 16b out of both ends of a first electric path L1 to the low potential electric path NL side out of both ends of a second electric path L2 through an output capacitor 24 is defined to be a target electric path. Then, on the first electric path L1, a relay 26 is provided for electrically switching, to an open state, the target electric path to the potential electric path NL side out of both the ends of the second electric path L2, in a period in which power is transmitted between an AC power 50 and a power storage device 40 in a contact power supply mode.

Description

  The present invention relates to a power feeding apparatus configured to be able to transmit power between an external AC power source and a power feeding target.

  As this type of power supply device, as can be seen in Patent Document 1 below, a configuration in which an AC power supply is contact-charged (conductive charging) from an AC power supply to a power storage device via a power receiving terminal, Inductive charging) is known. Specifically, this device includes a charger configured to be able to charge the power storage device from an AC power source via a power receiving terminal, and a non-contact power receiving unit configured to be able to receive power from the AC power source in a non-contact manner.

  The charger converts the AC voltage input from the power receiving terminal into a DC voltage and outputs the DC voltage, and converts the DC voltage output from the first rectification unit into an AC voltage to convert 1 of the insulation transformer. An inverter to be applied to the secondary winding, and a second rectifier that converts the AC voltage output from the secondary winding of the insulation transformer into a DC voltage and applies the DC voltage to the power storage device. The charger also includes a third rectification unit that converts the AC voltage output from the non-contact power reception unit into a DC voltage and outputs the DC voltage to the second rectification unit. According to such a structure, the 2nd rectification | straightening part used at the time of contact charge can be diverted as a part of structure requested | required at the time of non-contact charge. Therefore, the number of parts of the power feeding device can be reduced.

International Publication No. 2010/131348

  Here, a capacitor for stabilizing the output voltage is usually provided on the output side of the third rectifier. For this reason, in the period when contact charging is performed, there is a concern that current flows from the second rectifying unit side to the capacitor side, and loss in the charger increases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a power feeding device that can suppress an increase in loss during a period in which contact charging is performed.

  In order to achieve the above object, the present invention provides a power feeding device configured to be able to transmit power between an external AC power source (50, 51) and a power supply target (40), and includes the AC power source (50). A connection terminal (11) configured to be electrically connectable, a transformer (15) having a primary winding (15a) and a secondary winding (15b), and the connection terminal and the primary winding. 1st power conversion part (12,14) comprised so that electric power transmission was possible between, and two pairs of semiconductor elements (16a-16d) mutually connected in series, and two series of said semiconductor elements connected in series The body is connected in parallel to each other, and is electrically connected to the second power conversion unit (16) configured to transmit power between the secondary winding and the power supply target, and the AC power source (51). Can be received contactlessly from the AC power supply via the power transmission coil (52) A non-contact power receiving unit (21) having a power receiving coil (21a) configured in the above, and a second voltage from a pair of terminals (T3, T4) by converting an AC voltage output from the non-contact power receiving unit into a DC voltage. And a third power converter (23; 27; 28; 29) that outputs to the power converter, and the power feeding device includes the connection terminal, the first power converter, the transformer, and the second power converter. Through the contact power supply mode for transmitting power between the AC power supply and the power supply target, and via the non-contact power receiving unit, the third power conversion unit, and the second power conversion unit, The contactless power supply mode for transmitting power to and from the power supply target can be switched, and one (16a, 16b) of connection points of two series of semiconductor elements connected in series and two sets of the semiconductors The other of the series connected elements (1 c, 16d) is connected through the secondary winding, and one of the pair of terminals of the third power conversion unit (T3) and the series connection body of the two sets of the semiconductor elements A first electrical path (L1) that connects one (16a, 16b; 16c, 16d) connection point, the other (T4) of the pair of terminals of the third power converter, and the semiconductor element The second electric path (L2) that connects the low potential side of both ends of the series connection body and the capacitor (24; 28c, 28d; 29c, 29d) that connects between the pair of terminals of the third power converter. ) And the target electrical path from the semiconductor element side of the both ends of the first electrical path to the semiconductor element side of the both ends of the second electrical path via the capacitor, and the contact Depending on the power supply mode, the AC power Switching means (26) for switching the target electrical path to an open state by energization operation during a period in which power is transmitted to the power supply target.

  In the above invention, by providing the switching means in the target electrical path, it is possible to avoid current flowing through the target electrical path including the capacitor during the period in which power is transmitted in the contact power supply mode. For this reason, an increase in loss in the power feeding device can be suppressed.

The whole block diagram of the vehicle-mounted electric power feeder concerning 1st Embodiment. The figure explaining the loss increase at the time of the contact charge mode (charge operation) concerning a comparison technique. The figure explaining the loss increase at the time of the contact charge mode concerning a comparison technique (reverse tide operation). The figure which shows the stray capacitance of the relay concerning a comparison technique. The figure which shows the distribution channel of the common mode noise concerning a comparison technique. The figure which shows the structure which reduces the common mode noise concerning 1st Embodiment. The whole block diagram of the vehicle-mounted electric power feeder concerning 2nd Embodiment. The whole block diagram of the vehicle-mounted electric power feeder concerning 3rd Embodiment. The whole block diagram of the vehicle-mounted electric power feeder concerning 4th Embodiment. The block diagram of the 3rd rectification | straightening part concerning other embodiment. The block diagram of the 3rd rectification | straightening part concerning other embodiment. The block diagram of the 3rd rectification | straightening part concerning other embodiment.

(First embodiment)
Hereinafter, a first embodiment in which a power feeding device according to the present invention is embodied as a vehicle power feeding device will be described with reference to the drawings.

  As shown in FIG. 1, the vehicle includes a contact charger 10, a non-contact charger 20, a control device 30 that controls each charger 10, 20, and a power storage device 40 that is a power supply target. I have. As the power storage device 40, for example, a storage battery (nickel metal hydride storage battery, lithium ion storage battery) or a large-capacity capacitor can be used.

  Each of the chargers 10 and 20 charges the power storage device 40 with electric power supplied from an AC power supply 50 outside the vehicle via the contact charger 10 or AC power supply outside the vehicle via the non-contact charger 20. The power storage device 40 is configured to perform a charging operation such as charging the power storage device 40 with the power supplied from the power source 51. Each charger 10, 20 returns power from the power storage device 40 to the AC power supply 50 via the contact charger 10, or power is supplied from the power storage device 40 to the AC power supply 51 via the non-contact charger 20. So-called reverse tide operation is possible to return.

  The contact charger 10 includes a connection terminal 11, a first rectifier 12, a first capacitor 13, an inverter 14, an insulation transformer 15, and a second rectifier 16. The connection terminal 11 is an interface for performing contact charging from the AC power supply 50. The connection terminal 11 is configured to be electrically connectable to a power outlet or the like (not shown) of the AC power supply 50.

  The first rectifier 12 converts the AC voltage input from the connection terminal 11 into a DC voltage during the charging operation and outputs the DC voltage to the inverter 14 and the DC voltage output from the inverter 14 during the reverse power operation. A function of converting the voltage into a voltage and outputting the voltage to the connection terminal 11. In the present embodiment, as the first rectification unit 12, two pairs of switching elements (for example, N-channel MOSFETs) connected in series are connected in parallel. A first capacitor 13 is interposed between the first rectifier 12 and the inverter 14.

  The inverter 14 converts the DC voltage output from the first rectifying unit 12 into an AC voltage during the charging operation and outputs the AC voltage to the primary winding 15a constituting the insulation transformer 15, and the primary during the reverse power operation. The AC voltage output from the winding 15a is converted into a DC voltage and output to the first rectification unit 12. In the present embodiment, a full bridge circuit including four switching elements (for example, N-channel MOSFETs) is used as the inverter 14. In the present embodiment, the first rectification unit 12 and the inverter 14 correspond to a “first power conversion unit”.

  A second rectification unit 16 (corresponding to a “second power conversion unit”) is connected to the secondary winding 15 b constituting the insulating transformer 15. The second rectification unit 16 converts the AC voltage output from the secondary winding 15b during the charging operation into a DC voltage and outputs the DC voltage to the power storage device 40 side, and inputs from the power storage device 40 side during the reverse power operation. A function of converting the DC voltage thus converted into an AC voltage and outputting the AC voltage to the secondary winding 15b. Specifically, the second rectification unit 16 includes first and second switching elements 16a and 16b connected in series with each other, and third and fourth switching elements 16c and 16d connected in series with each other. In the present embodiment, voltage-controlled semiconductor switching elements are used as the switching elements 16a to 16d, and more specifically, N-channel MOSFETs are used.

  The drain of the second switching element 16b is connected to the source of the first switching element 16a, and the drain of the fourth switching element 16d is connected to the source of the third switching element 16c. The drain of the first switching element 16a is connected to the drain of the third switching element 16c, and the source of the second switching element 16b is connected to the source of the fourth switching element 16d.

  The positive terminals of the power storage device 40 are connected to the drains of the first and third switching elements 16a and 16c via the high-potential electrical path PL, and the low potentials are connected to the sources of the second and fourth switching elements 16b and 16d. The negative electrode terminal of the power storage device 40 is connected via the electrical path NL. Note that the high-potential electrical path PL and the low-potential electrical path NL are connected via the second capacitor 17.

  The non-contact charger 20 includes a non-contact power reception unit 21, a filter 22, a third rectification unit 23 (corresponding to a “third power conversion unit”), and an output capacitor 24. The non-contact power receiving unit 21 includes a power receiving coil 21 a configured to be able to receive power from the AC power source 51 in a non-contact manner by being magnetically coupled to a power transmitting coil 52 electrically connected to the AC power source 51. The filter 22 removes noise from the AC voltage output from the non-contact power reception unit 21. The non-contact charger 20 includes a shield material SD that integrally electromagnetically shields the non-contact power receiving unit 21, the filter 22, the third rectifying unit 23, and the output capacitor 24. Further, the filter 22 is not an essential component for the non-contact charger 20.

  The third rectifier 23 has a function of converting the AC voltage output from the filter 22 and input from the first and second terminals T1 and T2 into a DC voltage and outputting the DC voltage from the third and fourth terminals T3 and T4. . The third rectification unit 23 includes first to fourth diodes 23a to 23d, which are semiconductor elements. Specifically, the cathode of the second diode 23b is connected to the anode of the first diode 23a, and the first terminal T1 is connected to the connection point of these diodes 23a and 23b. The cathode of the fourth diode 23d is connected to the anode of the third diode 23c, and the second terminal T1 is connected to the connection point of these diodes 23c and 23d. The cathode of the third diode 23c is connected to the cathode of the first diode 23a, and the third terminal T3 is connected to the connection point of these diodes 23a and 23c. The anode of the second diode 23b is connected to the anode of the fourth diode 23d, and the fourth terminal T4 is connected to the connection point of these diodes 23b and 23d.

  The positive terminal PP of the output capacitor 24 is connected to the third terminal T3, and the negative terminal NP of the output capacitor 24 is connected to the fourth terminal T4. A connection point of the first and second switching elements 16a and 16b constituting the second rectifying unit 16 is connected to the third terminal T3 via the first electric path L1. The source side of the second and fourth switching elements 16b and 16d is connected to the fourth terminal T4 via the second electric path L2. The first electrical path L1 is provided with a reactor 25 and a relay 26 as a “switch”. Specifically, in the first electrical path L1, a relay 26 and a reactor 25 are provided in order from the third terminal T3 side. The relay 26 is turned on (closed) to electrically close the first electrical path L1, and is turned off (opened) to electrically open the first electrical path L1. .

  Control device 30 operates each element constituting contact charger 10 to operate the power supply device in a contact power supply mode in which power is transmitted between AC power supply 50 and power storage device 40. The control device 30 performs one operation selected from the charging operation and the reverse power operation in the contact power supply mode.

  Control device 30 operates each element constituting each charger 10 and 20 to operate the power feeding device in a non-contact power feeding mode in which power is transmitted between AC power supply 51 and power storage device 40. In the present embodiment, since the contact power supply mode and the non-contact power supply mode cannot be executed at the same time, the control device 30 selects and executes one of these modes.

  Here, during the charging operation in the contact power supply mode, the second rectification unit 16 is operated so that the AC voltage output from the secondary winding 15 b is converted into a DC voltage and output to the power storage device 40. Here, for example, it is possible to select synchronous rectification in which the set of the first and fourth switching elements 16a and 16d and the set of the second and third switching elements 16b and 16d are alternately turned on and off. On the other hand, during the reverse power operation, the first and fourth switching elements 16a and 16d and the second and third switching elements 16b and 16d are converted in order to convert the DC voltage output from the power storage device 40 into an AC voltage. The on / off operation is alternately performed with the pair.

  On the other hand, during the charging operation in the non-contact power feeding mode, the reactor 25 can be used to control the output current of the third rectifying unit 23 (specifically, for example, the charging current of the power storage device 40). Specifically, the output current of the third rectifier 23 can be controlled by alternately turning on and off the first switching element 16a and the second switching element 16b.

  Next, the relay 26 that is a characteristic configuration according to the present embodiment will be described. The relay 26 is provided for the purpose of suppressing the increase in loss due to the current flowing from the second rectifying unit 16 side to the output capacitor 24 side and reducing the common mode noise in the contact power supply mode. Hereinafter, the effect of providing the relay 26 will be described in comparison with the comparative technique.

<1. Suppression effect of loss increase>
First, the comparison technique will be described with reference to FIGS. Here, the comparative technique in FIGS. 2 and 3 is obtained by removing the relay 26 from the power feeding apparatus shown in FIG. In FIGS. 2 and 3, the switching elements 16 a to 16 d are illustrated in a simplified manner.

  During the charging operation in the contact power supply mode, during the period in which the first and fourth switching elements 16a and 16d are turned on, the output current of the secondary winding 15b as shown by the one-dot chain line in FIG. Flows in a closed circuit including the first switching element 16a, the second capacitor 17, the fourth switching element 16d, and the secondary winding 15b. The output current of the secondary winding 15b further flows through a closed circuit including the reactor 25, the output capacitor 24, and the secondary winding 15b as indicated by a chain line in the figure. As a result, useless charges are accumulated in the output capacitor 24.

  After the first and fourth switching elements 16a and 16d are switched to the OFF operation, the charge accumulated in the output capacitor 24 is reduced during the period in which the second and third switching elements 16b and 16c are ON. Resonance occurs in the closed circuit indicated by the alternate long and short dash line and the broken line in 2 (b). At this time, since the secondary winding 15b is included in one of the resonance paths, an additional current flows through the secondary winding 15b. As a result, there is a concern that the conduction loss in the secondary winding 15b increases and the amount of heat generated in the secondary winding 15b increases.

  On the other hand, during the reverse power flow operation in the contact power supply mode, during the period in which the first and fourth switching elements 16a and 16d are turned on, the secondary winding 15b as shown by a one-dot chain line in FIG. Current flows through a closed circuit including the fourth switching element 16d, the second capacitor 17, the first switching element 16a, and the secondary winding 15b. The output current of the secondary winding 15b further flows into the output capacitor 24 as indicated by the chain line in the figure. As a result, useless charges are accumulated in the output capacitor 24.

  After the first and fourth switching elements 16a and 16d are switched to the OFF operation, the charge accumulated in the output capacitor 24 is reduced during the period in which the second and third switching elements 16b and 16c are ON. Resonance occurs in a closed circuit indicated by a broken line in 3 (b). At this time, since the secondary winding 15b is included in the resonance path, an additional current flows through the secondary winding 15b. As a result, there is a concern that the conduction loss in the secondary winding 15b increases and the amount of heat generated in the secondary winding 15b increases.

  On the other hand, in this embodiment, the relay 26 is provided in the first electric path L1. On the premise of such a configuration, the first electrical path L1 is electrically opened by turning off the relay 26 during the period in which the contact power feeding mode is performed. As a result, the resonance path shown in FIGS. 2B and 3B can be electrically cut off, and the occurrence of resonance can be avoided. Therefore, it is possible to suppress an increase in loss due to the current flowing through the closed circuit including the output capacitor 24 in the contact power supply mode.

<2. Common mode noise reduction effect>
First, the comparison technique will be described with reference to FIGS. 4 and 5. Here, the comparative technique is the one in which the relay 31 is provided on the connection point side of the first and second switching elements 16a and 16b with respect to the reactor 25 in the first electric path L1 in the power feeding apparatus of FIG. is there.

  In the present embodiment, the following are listed as stray capacitances that cause common mode noise. Specifically, as shown in FIG. 4, the relay 31 and a ground line GND (for example, a housing that houses the contact charger 10 and the non-contact charger 20) that is a portion having a reference potential in the power feeding device. A stray capacitance (hereinafter referred to as a first stray capacitance 53) is formed between them. Further, as shown in FIG. 5, a stray capacitance (hereinafter referred to as a second stray capacitance 55) is also formed between the connection point of the third and fourth switching elements 16c and 16d and the ground line GND. The second stray capacitance 55 is formed between, for example, the electrodes of the elements 16c and 16d and the ground line GND.

  Here, in the contact power supply mode, since an AC voltage is output from the secondary winding 15b, the connection point between the first and second switching elements 16a and 16b and the connection between the third and fourth switching elements 16c and 16d. The potential with the point will fluctuate. For this reason, under the condition that the relay 31 is turned off, the fluctuation of the potential becomes the noise source 54, and the common mode current flows through the closed circuit including the first stray capacitance 53, the ground line GND, and the second stray capacitance 55 ( Common mode noise is generated). As a result, the common mode noise has an adverse effect on the electronic device connected to the ground line GND.

  On the other hand, in this embodiment, as shown in FIG. 6, the reactor 25 is provided in the noise source 54 side rather than the relay 26 in the 1st electric path | route L1. The relay 26 is usually provided to serve to electrically disconnect components (contact charger 10 and non-contact charger 20). For this reason, the relay 26 is normally provided in the location shown in FIG. However, in the present embodiment, focusing on the fact that the reactor 25 has a characteristic of removing high-frequency common mode noise, the reactor 25 added for the current control function is also functioned as a noise filter. FIG. 6 also shows a stray capacitance (hereinafter referred to as a third stray capacitance 56) formed between the reactor 25 and the ground line GND. However, since the third stray capacitance 56 is sufficiently smaller than the first stray capacitance 53, the influence on the increase of common mode noise is small.

  According to the embodiment described in detail above, the following effects can be obtained.

  (1) The relay 26 is provided in the first electric path L1. Then, the relay 26 was turned off during the contact power supply mode period. For this reason, it is possible to avoid a current from flowing through the resonance path including the output capacitor 24. Thereby, an increase in loss in the power feeding device can be suppressed, and as a result, power transmission efficiency between the AC power supply 50 and the power storage device 40 in the contact power feeding mode can be improved.

  (2) The reactor 25 is provided on the connection point side of the first and second switching elements 16a and 16b with respect to the relay 26 in the first electric path L1. For this reason, common mode noise can be reduced suitably and by extension, EMC (electromagnetic compatibility) can be maintained high. Particularly in this embodiment, the relay 26 is used as a switch. Since the relay 26 has a large stray capacitance, common mode noise tends to increase. For this reason, in this embodiment using the relay 26 as a switch, the merit which provides the reactor 25 in the connection point side of the 1st, 2nd switching element 16a, 16b rather than the relay 26 is large in the 1st electric path | route L1.

(Second Embodiment)
Hereinafter, the second embodiment will be described with reference to the drawings with a focus on differences from the first embodiment. In the present embodiment, as shown in FIG. 7, the connection destination of the first electrical path L1 is the connection point of the third and fourth switching elements 16c and 16d. In FIG. 7, the same members as those shown in FIG. 1 are denoted by the same reference numerals for the sake of convenience. Also according to this embodiment, the same effect as that of the first embodiment can be obtained.

(Third embodiment)
Hereinafter, the third embodiment will be described with reference to the drawings with a focus on differences from the first embodiment. In this embodiment, as shown in FIG. 8, the installation location of the relay 26a is changed from the first electrical path L1 to the second electrical path L2. In FIG. 8, the same members as those shown in FIG. 1 are given the same reference numerals for the sake of convenience. Also according to this embodiment, the same effect as that of the first embodiment can be obtained.

(Fourth embodiment)
Hereinafter, the fourth embodiment will be described with reference to the drawings with a focus on differences from the first embodiment. FIG. 9 is an overall configuration diagram of the power feeding device according to the present embodiment. In FIG. 9, the same members as those shown in FIG. 1 are given the same reference numerals for the sake of convenience.

  As shown in the drawing, in the present embodiment, a switching relay 18 that electrically switches the electrical path between the open state and the closed state is provided in the electrical path that connects the secondary winding 15b and the second rectifying unit 16. ing. Then, the switching relay 18 is turned off during the period in which the non-contact power feeding mode is performed. Thereby, electric power can be prevented from being transmitted from the second rectifying unit 16 to the inverter 14 side via the insulating transformer 15 in the non-contact power supply mode period.

  Here, in the present embodiment, of the connection points of the first and second switching elements 16a and 16b and the connection points of the third and fourth switching elements 16c and 16d, the first electrical path L1 is not connected. A switching relay 18 is provided on the electrical path connecting the secondary winding 15b. Since stray capacitance can also be formed between the switching relay 18 and the ground line GND, according to the present embodiment, it is possible to further obtain an effect that the secondary winding 15b can function as a common mode noise filter. Can do.

(Other embodiments)
Each of the above embodiments may be modified as follows.

  In the third and fourth embodiments, as described in the second embodiment, the connection destination of the first electric path L1 is changed to the connection point of the third and fourth switching elements 16c and 16d. Good.

  -You may apply the switching relay 18 demonstrated in the said 4th Embodiment to the electric power feeder of the said 2nd, 3rd embodiment.

  -As a 3rd rectification | straightening part, it is not restricted to what was illustrated to said each embodiment. For example, as shown in FIG. 10, the third rectifying unit 27 may be provided with fifth to eighth switching elements 27 a to 27 d. In this case, during the non-contact power supply mode period, a reverse power operation in which power is transmitted from the power storage device 40 to the AC power source 51 via the non-contact power receiving unit 21 is possible. In FIG. 10, N-channel MOSFETs are shown as the switching elements 27a to 27d, but may be IGBTs, for example.

  For example, as shown in FIG. 11, a voltage doubler rectifier circuit including fifth and sixth diodes 28 a and 28 b and third and fourth capacitors 28 c and 28 d may be used as the third rectifier 28. In this case, the voltage between the terminals of the power receiving coil 21a can be reduced, and the current flowing through the power receiving coil 21a can be reduced. As a result, an increase in loss in the power receiving coil 21a can be suppressed. In this case, the series connection body of the third and fourth capacitors 28c and 28d serves as the output capacitor 24 shown in FIG. For this reason, the output capacitor 24 may be removed, or may be left to make the output voltage more stable.

  Further, for example, as shown in FIG. 12, a voltage doubler rectifier circuit including ninth and tenth switching elements 29a and 29b and fifth and sixth capacitors 29c and 29d may be used as the third rectifier 29. In this case, during the non-contact power supply mode period, a reverse power operation in which power is transmitted from the power storage device 40 to the AC power source 51 via the non-contact power receiving unit 21 is possible. In this case, the series connection body of the fifth and sixth capacitors 29c, 29d serves as the output capacitor 24 shown in FIG. For this reason, the output capacitor 24 may be removed, or may be left to make the output voltage more stable.

  In each of the above embodiments, a switch other than a relay may be used as long as it is a switch that can be electrically switched between an input / output terminal by an energization operation. Further, the switching means for switching the target electrical path to the open state is not limited to a switch. For example, the resistor may be provided in the target electrical path and the resistance value can be variably set by an energization operation. In this case, in the contact power supply mode period, the target electrical path can be electrically opened by setting the resistance value of the resistor to a very high value by energization operation.

  The power supply target that transmits power to the AC power source is not limited to the power storage device, and may be, for example, an in-vehicle electronic device (for example, a rotating machine).

  DESCRIPTION OF SYMBOLS 10 ... Contact type charger, 20 ... Non-contact type charger, 25 ... Reactor, 26 ... Relay

Claims (6)

A power supply device configured to be able to transmit power between an external AC power supply (50, 51) and a power supply target (40),
A connection terminal (11) configured to be electrically connectable to the AC power source (50);
A transformer (15) having a primary winding (15a) and a secondary winding (15b);
A first power converter (12, 14) configured to be able to transmit power between the connection terminal and the primary winding;
There are two sets of a pair of semiconductor elements (16a to 16d) connected in series with each other, and two sets of semiconductor elements connected in series are connected in parallel to each other, and between the secondary winding and the power supply target. A second power conversion unit (16) configured to transmit power at
A non-contact power receiving unit (21) having a power receiving coil (21a) configured to be able to receive power from the AC power source in a non-contact manner via a power transmitting coil (52) electrically connected to the AC power source (51);
A third power conversion unit (23; 27; 28; 29) that converts the AC voltage output from the non-contact power reception unit into a DC voltage and outputs the DC voltage from a pair of terminals (T3, T4) to the second power conversion unit. When,
With
The power supply device includes a contact power supply mode for transmitting power between the AC power source and the power supply target via the connection terminal, the first power conversion unit, the transformer, and the second power conversion unit, The contact power receiving unit, the third power conversion unit, and the second power conversion unit are configured to be able to switch between a non-contact power supply mode for transmitting power between the AC power source and the power supply target,
The connection point of one (16a, 16b) of the series connection bodies of the two sets of semiconductor elements and the connection point of the other (16c, 16d) of the series connection bodies of the two sets of semiconductor elements are the secondary Connected through windings,
A first connecting the one (T3) of the pair of terminals of the third power converter and one (16a, 16b; 16c, 16d) of the series connected bodies of the two sets of semiconductor elements. An electrical path (L1);
A second electrical path (L2) that connects the other (T4) of the pair of terminals of the third power conversion unit and a low potential side of both ends of the series connection body of the semiconductor elements;
A capacitor (24; 28c, 28d; 29c, 29d) for connecting the pair of terminals of the third power conversion unit;
Provided in the target electrical path from the semiconductor element side of both ends of the first electrical path through the capacitor to the semiconductor element side of both ends of the second electrical path, and depending on the contact power supply mode Switching means (26; 26a) for electrically switching the target electrical path to an open state by an energization operation during a period in which power is transmitted between the AC power source and the power supply target;
A power supply apparatus comprising: The switching means is a switch that can electrically switch the target electrical path between an open state and a closed state,
Of both ends of the target electrical path, an output current of the pair of terminals of the third power converter is provided between a connection point side of the first electrical path and the semiconductor element to an installation location of the switch. The power feeding device according to claim 1, further comprising a reactor (25) for controlling the power. The switch (26) is provided in the first electric path,
The power feeding device according to claim 2, wherein the reactor (25) is provided on the semiconductor element side of the switch in the first electric path. The switch (26a) is provided in the second electric path,
The power feeding device according to claim 2, wherein the reactor (25) is provided in the first electric path.   The power supply apparatus according to claim 2, wherein the switch is a relay.   The power feeding device according to claim 1, wherein the semiconductor element configuring the second power conversion unit is a semiconductor switching element.

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