JP2016187271A - Power supply unit and vehicle drive apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply unit and vehicle drive apparatus having the same, capable of achieving both of power conversion and non-contact power reception as well as miniaturization.SOLUTION: A power supply unit 10 includes a DC-DC converter 11 having a coil 21. The power supply unit 10 further includes a conversion mode for performing power conversion using the coil 21 as an operation mode and a power reception mode for contactlessly receiving AC power for transmission input into a power transmission-side resonance circuit 114 provided in a power transmission apparatus 110 using the coil 21, thereby contactlessly receiving power for power transmission using the power supply unit 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply device and a vehicle drive device including the power supply device.

  For example, some power supply devices that perform power conversion include a DC / DC converter having a coil (see, for example, Patent Document 1). Further, for example, Patent Document 2 describes a power receiving device having a power receiving side coil capable of receiving AC transmission power input to a power transmitting side coil provided in the power transmitting device in a contactless manner.

JP 2008-306795 A JP2013-243882A

  Here, it may be difficult or troublesome to mount both the power supply device and the power receiving device on a device having a limited space such as a vehicle. In particular, it may not be possible to secure a space for mounting both the DC / DC converter coil and the power transmission side coil, or the mounting may be complicated.

  The present invention has been made in view of the above-described circumstances, and an object thereof is a power supply device capable of performing both power conversion and non-contact power reception while achieving downsizing, and a vehicle equipped with the power supply device. It is to provide a driving device.

  A power supply device that achieves the above object includes a DC / DC converter having a coil and performs power conversion, and the power supply device uses the coil as an operation mode and performs conversion of the power using the coil. And a power reception mode in which AC power for AC transmission input to a power transmission side coil provided in the power transmission device is received in a non-contact manner using the coil.

  According to this configuration, since the power reception mode is provided as the operation mode in addition to the conversion mode, the power for transmission can be received in a contactless manner using the power supply device. Moreover, both power conversion and non-contact power reception are performed using a coil. Thereby, since it is not necessary to provide the coil for power conversion and the coil for non-contact power reception separately, size reduction can be achieved compared with the structure which each provides both coils. Therefore, both power conversion and non-contact power reception can be performed while downsizing.

  About the said power supply device, the conversion line used for the said power conversion, the receiving line used for receiving the electric power for power transmission non-contacting, and the electric power transmission line where electric power is transmitted are the said conversion line or the said receiving line A switching unit that switches to the control unit, and a control unit that controls the operation mode by controlling the switching unit, wherein the conversion line and the power receiving line have a common line in part, and the common line The coil may be provided on the top.

  According to such a configuration, when the switching unit is controlled by the control unit, power is transmitted to the power transmission line corresponding to the operation mode, and operation corresponding to the operation mode, specifically, power conversion or non-contact power reception is performed. Is called. Thereby, both power conversion and non-contact power reception can be performed using the power supply device.

  Moreover, since the coil is provided on the common line which is a common part of the conversion line and the power receiving line, the coil is used in both the conversion mode and the power receiving mode. Thereby, the effect mentioned above is realizable.

  In the power supply apparatus, the DC / DC converter includes a capacitor provided on the common line, and the capacitor is connected in parallel to the coil when the operation mode is the conversion mode. In the case where the power conversion is used and the operation mode is the power reception mode, a series resonance circuit may be configured in cooperation with the coil.

  According to this configuration, when the operation mode is the power reception mode, the capacitor used for power conversion forms a series resonance circuit in cooperation with the coil. Thereby, the improvement of non-contact electric power transmission efficiency can be aimed at. Therefore, it is possible to increase the functionality of the capacitor. Further, the configuration can be simplified as compared with a configuration in which a capacitor used for power conversion and a capacitor used for non-contact power reception are separately provided.

  For the power supply apparatus, the DC / DC converter includes two switching elements provided on the common line and connected in series to each other, and the coil is connected to a connection line of the both switching elements, Both switching elements are provided with free-wheeling diodes, respectively, and when the operation mode is the conversion mode, the control unit alternately turns on and off the switching elements at a predetermined conversion frequency. On the other hand, when the operation mode is the power reception mode, both the switching elements may be maintained in the OFF state.

  According to such a configuration, when the operation mode is the conversion mode, the DC / DC converter performs step-up or step-down by alternately turning ON / OFF both switching elements. On the other hand, when the operation mode is the power reception mode, both switching elements are in the OFF state. In this case, the received power received by the coil is rectified by the return diode. Thereby, the power supply device can generate DC power in the power reception mode.

In the power supply device, the conversion frequency may be different from a resonance frequency of a low-pass filter formed by the coil and the capacitor connected in parallel.
According to such a configuration, when the operation mode is the conversion mode, it is possible to suppress unintended non-contact power transmission from the low pass filter to the power transmission side coil.

  The power supply device, comprising: a power storage device capable of outputting direct current power to the DC / DC converter; and a rectifying unit provided on the power reception line and rectifying the power received by the coil, The power reception mode may be a charging mode in which charging of the power storage device is performed when DC power rectified by the rectification unit is input to the power storage device via the power reception line.

According to such a configuration, the power storage device can be charged using the received power received from the power transmission device.
For the power supply device, when the operation mode is the conversion mode, the DC power output from the DC / DC converter or the DC power input to the DC / DC converter is smoothed, while the operation mode is In the charging mode, a smoothing capacitor that smoothes the DC power rectified by the rectifying unit may be provided.

  According to such a configuration, the smoothing capacitor smoothes the DC power output from the DC / DC converter or the DC power input to the DC / DC converter and the DC power obtained by rectifying the received power. Both are performed. Thereby, smoothing of both DC power can be aimed at, suppressing complication of composition.

  The power supply device includes a power storage device and an inverter that converts direct current power into alternating current power. In the conversion mode, the direct current power of the power storage device is converted into a voltage value by the DC / DC converter. It is preferable to include a mode in which the direct current power converted into alternating current power by the inverter.

According to such a configuration, AC power having a desired voltage value can be generated using the DC power of the power storage device while enabling non-contact power reception.
A vehicle drive device that achieves the above object includes the above-described power supply device and a generator motor that is driven when the AC power is input, and the conversion mode generates regenerative power generated by the generator motor, It includes a mode for converting power into DC power corresponding to the power storage device.

  According to such a configuration, in the vehicle drive device, both power conversion and non-contact power reception can be performed while downsizing. Further, when regenerative power is generated by the generator motor, the power storage device can be charged using the regenerative power.

  According to the present invention, it is possible to perform both power conversion and non-contact power reception while achieving miniaturization.

The circuit diagram which shows typically the electric constitution of a power supply device and a vehicle. The schematic diagram which shows a vehicle and a power transmission apparatus. The graph which shows the frequency characteristic of electric power transmission efficiency. The graph which shows the frequency characteristic of the gain of a low-pass filter. The circuit diagram which shows typically the power supply device at the time of drive conversion mode. The circuit diagram which shows typically the power supply device at the time of a power receiving mode.

Hereinafter, an embodiment of a power supply device and a vehicle equipped with the power supply device will be described.
As shown in FIG. 1, the vehicle 100 includes a vehicle drive device 20 having a power supply device 10 including a power storage device 101 and a motor generator 102 as a generator motor. The motor generator 102 is used for traveling of the vehicle 100, for example. Specifically, the vehicle 100 is configured such that the driving force generated by the motor generator 102 is transmitted to the driving wheels 103 via a power transmission gear (not shown) or the like.

  The motor generator 102 is, for example, a three-phase AC rotary motor having three coils. The motor generator 102 generates a driving force when AC driving power is input from the power supply device 10, and generates power by rotating the driving wheels 103 during regenerative braking of the vehicle 100 to generate regenerative power.

  The power storage device 101 can discharge DC power and can be charged when DC power is input. As the power storage device 101, for example, a secondary battery or an electric double layer capacitor can be considered. In the present embodiment, the voltage value of the driving power is set higher than the DC voltage value of the power storage device 101.

  The power supply apparatus 10 includes a conversion mode for performing power conversion as an operation mode. The conversion mode includes a drive conversion mode in which DC power from the power storage device 101 is converted into AC drive power for driving the motor generator 102, and a regenerative power generated by the motor generator 102 is converted into a DC voltage value (battery of the power storage device 101). Voltage) and a regenerative conversion mode for converting to DC power having the same voltage value.

In addition to the conversion mode, the power supply device 10 has a power reception mode in which AC transmission power input to the power transmission side coil 111 provided in the power transmission device 110 is received in a contactless manner.
The power transmission device 110 will be described. As illustrated in FIG. 2, the power transmission device 110 is provided on the ground in the present embodiment. As shown in FIG. 1, the power transmission device 110 includes an AC power source 112 that can output power for transmission, and a power transmission side capacitor 113 connected to the power transmission side coil 111. In the present embodiment, the power transmission side coil 111 and the power transmission side capacitor 113 are connected in parallel to each other, and the power transmission side coil 111 and the power transmission side capacitor 113 constitute a power transmission side resonance circuit 114. The power for power transmission output from the AC power source 112 is input to the power transmission side resonance circuit 114.

The power supply device 10 will be described in detail.
As shown in FIG. 1, the power supply device 10 includes a DC / DC converter 11 that performs voltage value conversion, and an inverter 12 that converts DC power into AC power.

  The DC / DC converter 11 is connected to the power storage device 101. The DC / DC converter 11 is a so-called step-up / step-down type, and when the operation mode is the drive conversion mode, the DC voltage value of the power storage device 101 is boosted to generate DC power corresponding to the drive power.

  Inverter 12 is connected to DC / DC converter 11 and motor generator 102. The inverter 12 is a so-called three-phase inverter. When the operation mode is the drive conversion mode, the inverter 12 converts the DC power converted by the DC / DC converter 11 into drive power, and the converted drive power. Is output to the motor generator 102. On the other hand, when the operation mode is the regenerative conversion mode, inverter 12 rectifies the AC regenerative power generated by motor generator 102 and outputs the rectified regenerative power to DC / DC converter 11.

  When the operation mode is the regenerative conversion mode, the DC / DC converter 11 steps down the voltage value of the regenerative power rectified by the inverter 12 to generate DC power having the same voltage value as the DC voltage value of the power storage device 101. Generate. Further, when the operation mode is the power reception mode, the DC / DC converter 11 receives power for power transmission in a non-contact manner from the power transmission side resonance circuit 114 (specifically, the power transmission side coil 111) and receives the received power. Rectify power.

A specific circuit configuration of the DC / DC converter 11 will be described in detail.
As shown in FIG. 1, the DC / DC converter 11 includes a coil 21, a capacitor 22, and two switching elements Q1, Q2 connected in series with each other. Both the switching elements Q1, Q2 are composed of, for example, an IGBT. The switching elements Q1, Q2 are provided with free-wheeling diodes D1, D2 connected in parallel. The freewheeling diodes D1 and D2 may be IGBT parasitic diodes, or may be provided separately from the switching elements Q1 and Q2.

  The power supply apparatus 10 includes two power lines L1 and L2 connected to the inverter 12, and a switch line L3 connected to both power lines L1 and L2 and provided with both switching elements Q1 and Q2. Both the switching elements Q1 and Q2 are connected in series with each other. Specifically, the emitter of the first switching element Q1 and the collector of the second switching element Q2 are connected.

  The first power line L1 is a wiring that connects the inverter 12 and the collector of the first switching element Q1. Second power line L <b> 2 is a wiring that connects inverter 12 and the negative terminal (negative terminal) of power storage device 101. The emitter of the second switching element Q2 is connected to the second power line L2.

  The power supply device 10 is connected to a connection portion of the switching elements Q1 and Q2 in the switch line L3, and includes a coil line L4 provided with a coil 21 and two lines L5 and L6 branched from the coil line L4 into two branches. ing. Specifically, the power supply device 10 connects the coil line L4 and the positive terminal (positive terminal) of the power storage device 101, and includes the first conversion switch line L5 provided with the first conversion switching element Qx1, the coil And a capacitor line L6 provided with a capacitor 22 connected to the line L4. Furthermore, the power supply device 10 includes a second conversion switch line L7 that connects the capacitor line L6 and the second power line L2 and is provided with a second conversion switching element Qx2.

  As shown in FIG. 1, the power supply device 10 connects the first power line L1 and the switch line L3 to the + terminal (positive terminal) of the power storage device 101, and is provided with a first power receiving switching element Qy1. One power receiving switch line L8 is provided. The power supply apparatus 10 includes a second power receiving switch line L9 that is provided separately from the second conversion switch line L7 and connected to the capacitor line L6. The second power receiving switch line L9 is connected to a rectifying line L10 that connects the first power line L1 and the second power line L2, and the second power receiving switching element Qy2 is disposed on the second power receiving switch line L9. Is provided.

  Here, when both conversion switching elements Qx1 and Qx2 are in the OFF state and both power receiving switching elements Qy1 and Qy2 are in the ON state, a series power reception side resonance circuit (series resonance circuit) 23 is configured by the coil 21 and the capacitor 22. Is done.

  The power reception side resonance circuit 23 is configured to be able to receive power for transmission from the power transmission side resonance circuit 114 in a non-contact manner by magnetic field resonance. Specifically, the resonance frequency fa of the power reception side resonance circuit 23 and the resonance frequency fb of the power transmission side resonance circuit 114 are set to be the same.

  Further, the power transmission side resonance circuit 114 and the power reception side resonance circuit 23 are arranged at a magnetic resonance position. Specifically, as shown in FIG. 2, the power transmission side resonance circuit 114 (specifically, the power transmission side coil 111) is installed on the ground, and the power reception side resonance circuit 23 (specifically, the coil 21) is It is provided at a position that can face the circuit 114, that is, at the bottom of the vehicle 100.

  Here, as shown in FIG. 3, the power transmission efficiency η, which is the ratio of the power value of the received power received by the power-receiving-side resonance circuit 23 to the power value of the power for transmission output from the AC power supply 112, is It depends on the frequency f1 of the power used. Specifically, the power transmission efficiency η is maximized when the frequency f1 of power for transmission and the resonance frequencies fa and fb of the resonance circuits 23 and 114 coincide with each other, and decreases as the distance from the resonance frequencies fa and fb increases. To do. The power transmission efficiency η is substantially “0” in a range where the frequency f1 of the power for transmission is lower than the resonance frequencies fa and fb by a predetermined amount δf or more. Corresponding to this characteristic, the frequency f1 of the power for transmission is set to be the same as the resonance frequencies fa and fb of both the resonance circuits 23 and 114.

  According to such a configuration, the vehicle 100 is disposed in a situation where the relative position between the power transmission side resonance circuit 114 and the power reception side resonance circuit 23 is a position where magnetic resonance is possible, for example, in a position where both resonance circuits 23 and 114 are opposed in the vertical direction. In this situation, when power for transmission is input to the power transmission side resonance circuit 114, both resonance circuits 23 and 114 undergo magnetic field resonance. Thereby, the power reception side resonance circuit 23 receives a part of energy from the power transmission side resonance circuit 114. That is, the power receiving side resonance circuit 23 receives power for power transmission.

  As shown in FIG. 1, the power supply device 10 includes a rectifying unit 31 that rectifies the received power received by the power receiving side resonance circuit 23 (specifically, the coil 21). The rectifying unit 31 includes two rectifying diodes D3 and D4 provided on the rectifying line L10. Both rectifier diodes D3 and D4 are connected in the forward direction. Specifically, the anode of the first rectifier diode D3 and the cathode of the second rectifier diode D4 are connected. The cathode of the first rectifier diode D3 is connected to the first power line L1, and the anode of the second rectifier diode D4 is connected to the second power line L2. A second power receiving switch line L9 is connected to a connecting portion between the rectifier diodes D3 and D4. A third power receiving switching element Qy3 is provided on the rectification line L10.

  Incidentally, the rectification line L10 is provided closer to the inverter 12 than the switch line L3. A diode bridge is formed by the freewheeling diodes D1 and D2 and the rectifier diodes D3 and D4.

  In addition, the power supply device 10 includes a smoothing capacitor 32. The smoothing capacitor 32 is provided, for example, between the switch line L3 and the rectification line L10. The smoothing capacitor 32 smoothes the DC power output from the DC / DC converter 11 or the DC power input to the DC / DC converter 11 when the operation mode is the conversion mode. Specifically, the smoothing capacitor 32 smoothes the DC power output from the DC / DC converter 11 in the drive conversion mode, and smoothes the DC power input to the DC / DC converter 11 in the regenerative conversion mode. On the other hand, the smoothing capacitor 32 smoothes the DC power rectified by the rectifier 31 when the operation mode is the power reception mode.

  As shown in FIG. 1, the power supply device 10 includes a control unit 33 that controls the switching elements Q1 and Q2, the conversion switching elements Qx1 and Qx2, and the power receiving switching elements Qy1 to Qy3. The control unit 33 controls the operation mode of the power supply device 10 by controlling these switching elements Q1, Q2, Qx1, Qx2, Qy1 to Qy3.

  Specifically, when setting the operation mode to the conversion mode, the control unit 33 sets both the conversion switching elements Qx1 and Qx2 to the ON state (connected state or conductive state), while setting each of the power receiving switching elements Qy1 to Qy3. Set to OFF state (blocking state or non-conducting state). Then, the control unit 33 alternately turns on / off both the switching elements Q1, Q2 at a predetermined conversion frequency f2.

  Here, when both conversion switching elements Qx1 and Qx2 are in the ON state and each of the power receiving switching elements Qy1 to Qy3 is in the OFF state, the low-pass filter 40 is formed by the coil 21 and the capacitor 22 connected in parallel. As shown in FIG. 4, the gain (gain) G of the low-pass filter 40 is substantially constant below the resonance frequency fa of the low-pass filter 40, and attenuates when it becomes higher than the resonance frequency fa of the low-pass filter 40.

  Correspondingly, the conversion frequency f2 is set lower than the resonance frequency fa of the low-pass filter 40. Specifically, the conversion frequency f2 is set to a value (f2 ≦ fa−δf) at which the power transmission efficiency η is substantially “0”. In this case, as shown in FIG. 3, the attenuation by the low-pass filter 40 hardly occurs.

  On the other hand, when setting the operation mode to the power receiving mode, the control unit 33 sets both the conversion switching elements Qx1 and Qx2 to the OFF state, and sets each power receiving switching element Qy1 to Qy3 to the ON state. And the control part 33 sets both switching element Q1, Q2 to an OFF state.

  Incidentally, the power transmission device 110 includes a power transmission side controller 115 capable of wireless communication with the control unit 33. The control unit 33 makes a power transmission request to the power transmission side controller 115 based on the fact that the operation mode is set to the power reception mode. The power transmission side controller 115 controls the AC power source 112 so that power for transmission is output based on the reception of the power transmission request.

  Next, the effect | action of this embodiment is demonstrated using FIG.5 and FIG.6. FIG. 5 shows a case where the operation mode is a conversion mode (specifically, a drive conversion mode), and FIG. 6 shows a case where the operation mode is a power reception mode. In FIG.5 and FIG.6, a mode that electric power is transmitted with a dashed-two dotted line is shown typically.

  As shown in FIG. 5, when the operation mode is the conversion mode, both conversion switching elements Qx1 and Qx2 are turned on, and the power receiving switching elements Qy1 to Qy3 are turned off. In this case, as indicated by a two-dot chain line in FIG. 5, power is transmitted through the power lines L1 and L2, the switch line L3, the coil line L4, the capacitor line L6, and both the conversion switch lines L5 and L7. That is, each power line L1, L2, switch line L3, coil line L4, capacitor line L6, and both conversion switch lines L5, L7 are conversion lines Lx used for power conversion using the coil 21. The conversion line Lx is a power transmission line through which power is transmitted in the conversion mode. When the operation mode is the conversion mode, the capacitor 22 is connected in parallel to the coil 21 to form a low-pass filter 40 and is used for power conversion.

  As shown in FIG. 6, when the operation mode is the power reception mode, both conversion switching elements Qx1 and Qx2 are turned off, and each power reception switching element Qy1 to Qy3 is turned on. In this case, a series power reception side resonance circuit 23 is formed by the coil 21 and the capacitor 22, and power for power transmission is received by the power reception side resonance circuit 23. And the received electric power received is transmitted to the switch line L3 and the rectification line L10 through the coil line L4 and the second power reception switch line L9, and the diode constituted by the freewheeling diodes D1 and D2 and the rectification diodes D3 and D4. Rectified by a bridge. That is, it can be said that the freewheeling diodes D1 and D2 constitute a part of the rectifying unit 31. The rectified DC power is input to the power storage device 101 via the first power receiving switch line L8 and the second power line L2. Thereby, the power storage device 101 is charged. That is, the power receiving mode can be said to be a charging mode in which the power storage device 101 is charged using received power.

  As described above, when the operation mode is the power reception mode, power is transmitted through the power lines L1 and L2, the switch line L3, the coil line L4, the capacitor line L6, the rectification line L10, and both the power reception switch lines L8 and L9. That is, the power lines L 1 and L 2, the switch line L 3, the coil line L 4, the capacitor line L 6, the rectifying line L 10, and the both power receiving switch lines L 8 and L 9 are power receiving lines Ly used for contactless power receiving using the coil 21. The power reception line Ly is a power transmission line through which power is transmitted in the power reception mode.

  Here, electric power is transmitted to each of the power lines L1, L2, the switch line L3, the coil line L4, and the capacitor line L6 both in the conversion mode and in the power reception mode. That is, the power lines L1 and L2, the switch line L3, the coil line L4, and the capacitor line L6 are common lines that are common parts of the conversion line Lx and the power receiving line Ly.

  In addition, if attention is paid to the fact that the power transmission lines are switched by turning on / off the conversion switching elements Qx1, Qx2 and the power receiving switching elements Qy1-Qy3, the conversion switching elements Qx1, Qx2, and the power receiving switching elements Qy1- Qy3 can be said to be a switching unit that switches the power transmission line to the conversion line Lx or the power reception line Ly.

According to the embodiment described above in detail, the following effects are obtained.
(1) The power supply device 10 includes a DC / DC converter 11 having a coil 21. Then, the power supply device 10 uses, as the operation mode, a conversion mode for performing power conversion using the coil 21, and a power transmission side resonance circuit 114 (specifically, the power transmission side coil 111) provided in the power transmission device 110 using the coil 21. And a power receiving mode for receiving the AC power for transmission input in a non-contact manner. Thereby, the power for power transmission can be received in a non-contact manner using the power supply device 10.

  Moreover, both power conversion and non-contact power reception are performed using the coil 21. Thereby, since it is not necessary to provide the coil for power conversion and the coil for non-contact power reception separately, size reduction can be achieved compared with the structure which provides both coils. Therefore, both power conversion and non-contact power reception can be performed while downsizing.

  (2) The power supply device 10 converts the conversion line Lx used for power conversion, the power receiving line Ly used for receiving power for transmission without contact, and the power transmission line through which power is transmitted into the conversion line Lx or Each conversion switching element Qx1, Qx2 and each receiving switching element Qy1-Qy3 which switch to the receiving line Ly are provided. And the power supply device 10 is provided with the control part 33 which controls each conversion switching element Qx1, Qx2 and each power receiving switching element Qy1-Qy3. Thus, the control unit 33 controls the conversion switching elements Qx1 and Qx2 and the power receiving switching elements Qy1 to Qy3, so that power is transmitted to the power transmission line corresponding to the operation mode, and the operation corresponding to the operation mode is performed. Is done. Specifically, power conversion using the coil 21 is performed in the conversion mode, and contactless power reception using the coil 21 is performed in the power reception mode. Thereby, both power conversion and non-contact power reception can be performed using the power supply device 10.

  The coil 21 is provided on the coil line L4 common to the conversion line Lx and the power receiving line Ly. Thereby, since the coil 21 is used in both the conversion mode and the power reception mode, the effect (1) is achieved.

  (3) The capacitor 22 is provided on the capacitor line L6 constituting the common line. When the operation mode is the conversion mode, the capacitor 22 is connected in parallel to the coil 21 and used for power conversion. On the other hand, when the operation mode is the power reception mode, the capacitor 22 forms a power reception side resonance circuit 23 that is a series resonance circuit in cooperation with the coil 21. Thereby, it is possible to improve the power transmission efficiency η in the power receiving mode. Therefore, the multifunction of the capacitor 22 can be achieved. Further, the configuration can be simplified as compared with a configuration in which a capacitor used for power conversion and a capacitor used for non-contact power reception are separately provided.

  (4) Two switching elements Q1 and Q2 connected in series to each other are provided on the switch line L3 constituting the common line, and the coil 21 is connected to the connection line of both the switching elements Q1 and Q2. Yes. The switching elements Q1 and Q2 are provided with freewheeling diodes D1 and D2. When the operation mode is the conversion mode, the control unit 33 alternately turns ON / OFF both the switching elements Q1 and Q2 at the conversion frequency f2, while when the operation mode is the power receiving mode, the both switching elements Q1 and Q2 are maintained in the OFF state. Thereby, when the operation mode is the conversion mode, the DC / DC converter 11 performs step-up or step-down. On the other hand, when the operation mode is the power reception mode, both switching elements Q1, Q2 are maintained in the OFF state. In this case, the received power received by the power receiving side resonance circuit 23 is rectified by the free wheel diodes D1 and D2. Thereby, the power supply device 10 can generate DC power in the power reception mode.

  (5) The conversion frequency f2 is different from the resonance frequency fa of the low-pass filter 40 formed by the coil 21 and the capacitor 22 connected in parallel. Specifically, the conversion frequency f2 is set lower than the resonance frequency fa of the low-pass filter 40 so that the power transmission efficiency η approaches “0”. Thereby, when the operation mode is the conversion mode, unintended non-contact power transmission from the low-pass filter 40 toward the power transmission side resonance circuit 114 can be suppressed.

  (6) The power supply device 10 is provided on the power storage device 101 that can output DC power to the DC / DC converter 11 and the rectifying line L10 that constitutes the power receiving line Ly, and includes a coil 21 on the power receiving side resonance circuit 23. And a rectifying unit 31 that rectifies the received power received by. The power receiving mode is a charging mode in which the power storage device 101 is charged when the DC power rectified by the rectifying unit 31 is input to the power storage device 101 via the power receiving line Ly. Thereby, the power storage device 101 can be charged using the received power received from the power transmission device 110 in a contactless manner.

  (7) When the operation mode is the conversion mode, the power supply device 10 smoothes the DC power output from the DC / DC converter 11 or the DC power input to the DC / DC converter 11, while the operation mode is In the charging mode, a smoothing capacitor 32 that smoothes the DC power rectified by the rectifying unit 31 is provided. Accordingly, a smoothing capacitor that smoothes the DC power output from the DC / DC converter 11 or the DC power input to the DC / DC converter 11, and a smoothing capacitor that smoothes the DC power obtained by rectifying the received power. Need not be provided separately. Therefore, smoothing of both DC power can be achieved while suppressing the complexity of the configuration.

  (8) The vehicle drive device 20 includes the power supply device 10 and a motor generator 102 as a generator motor that is driven when AC drive power is input. And the power supply device 10 is provided with the inverter 12 which converts direct-current power into alternating current power.

  In such a configuration, the conversion mode includes a drive conversion mode in which the DC power of the power storage device 101 is converted in voltage value by the DC / DC converter 11 and the DC power converted in voltage is converted into drive power by the inverter 12. Thereby, motor generator 102 can be driven using the DC power of power storage device 101.

  Further, the conversion mode includes a regenerative conversion mode in which regenerative power generated by motor generator 102 is converted into DC power corresponding to power storage device 101, specifically, DC power having the same voltage value as the DC voltage value of power storage device 101. . Thereby, the electrical storage apparatus 101 can be charged using regenerated electric power.

In addition, you may change the said embodiment as follows.
A plurality of power transmission devices 110 may be arranged along the travel route, and may be configured to perform non-contact power transmission to the vehicle 100 that is traveling.

○ The common line may include at least the coil line L4.
○ A capacitor used in the conversion mode and a capacitor used in the power receiving mode may be provided separately. In this case, the power transmission line may be switched so that power is transmitted through the capacitor corresponding to the operation mode.

  The conversion frequency f2 and the resonance frequency fa of the low-pass filter 40 may be the same. In this case, the power transmission device 110 may include a frequency changing unit that can change the resonance frequency fb of the power transmission side resonance circuit 114 from the same frequency as the resonance frequency fa of the low-pass filter 40.

Although the freewheeling diodes D1 and D2 constitute a part of the rectifying unit 31, the present invention is not limited to this, and a rectifying diode may be provided separately from the freewheeling diodes D1 and D2.
The received power received by the power receiving resonance circuit 23 is used for charging the power storage device 101, but is not limited thereto, and may be used for other purposes. For example, the structure supplied to the load of alternating current drive may be sufficient. In this case, the rectification unit 31 may be omitted. In short, the power receiving mode is not limited to the charging mode.

  The smoothing capacitor 32 was used for both the smoothing of the DC power input / output to / from the DC / DC converter 11 and the smoothing of the DC power obtained by rectifying the received power. It is not restricted, The structure used for any one smoothing may be sufficient. In addition, a dedicated smoothing capacitor may be provided. That is, the number of smoothing capacitors 32 is not limited to one and is arbitrary.

○ Regenerative conversion mode may be omitted.
The power transmission device 110 may be mounted on the vehicle 100. In this case, the power transmission device 110 may be disposed at a position where the power transmission side resonance circuit 114 and the power reception side resonance circuit 23 can perform non-contact power transmission.

○ The mounting target of the power supply device 10 is not limited to the vehicle 100 and is arbitrary. In short, any non-contact power transmission system including the power supply device 10 and the power transmission device 110 may be used.
The frequency f1 of the power for transmission may deviate from the resonance frequencies fa and fb of both the resonance circuits 23 and 114 within a range where power transmission is possible. Further, the resonance frequencies fa and fb of both the resonance circuits 23 and 114 may be shifted within a range in which power transmission is possible.

  The specific configurations of the power transmission side resonance circuit 114 and the power reception side resonance circuit 23 are arbitrary. For example, a plurality of capacitors connected in series or in parallel to the coils 21 and 111, such as a π type and a T type. The structure which has may be sufficient, and the structure which has a some coil may be sufficient.

  ○ The power transmission side capacitor 113 may be omitted. Further, the capacitor line L6 may be excluded from the power receiving line Ly. In this case, magnetic field resonance may be performed using the parasitic capacitance of both the coils 21 and 111, or non-contact power transmission may be performed by electromagnetic induction.

  The vehicle 100 may be, for example, an electric vehicle, a hybrid vehicle having an engine separate from the motor generator 102, or a fuel cell vehicle equipped with a fuel cell.

The power supply device 10 may be mounted other than the vehicle 100. Further, the drive target of the power supply apparatus 10 is not limited to the motor generator 102 and is arbitrary.
○ The inverter 12 may be omitted.

  O Each embodiment and the above-described other examples may be appropriately combined.

  DESCRIPTION OF SYMBOLS 10 ... Power supply device, 11 ... DC / DC converter, 12 ... Inverter, 20 ... Vehicle drive device, 21 ... Coil, 22 ... Capacitor, 23 ... Power-receiving side resonance circuit, 31 ... Rectifier, 32 ... Smoothing capacitor, 33 ... Control unit, 40 ... low-pass filter, 100 ... vehicle, 101 ... power storage device, 102 ... motor generator (generator motor), 110 ... power transmission device, 111 ... power transmission side coil, 114 ... power transmission side resonance circuit, Q1, Q2 ... switching element , Qx1, Qx2 ... conversion switching element (switching unit), Qy1-Qy3 ... power receiving switching element (switching unit), D1, D2 ... freewheeling diode, Lx ... conversion line, Ly ... power receiving line, fa ... resonance of power receiving side resonance circuit Frequency, fb: resonance frequency of the power transmission side resonance circuit, f1: frequency of power for transmission, f2: frequency for conversion.

Claims (9)

In a power supply device that includes a DC / DC converter having a coil and performs power conversion,
The power supply device has an operation mode as follows:
A conversion mode for performing the power conversion using the coil;
Using the coil, a power receiving mode for receiving AC power for transmission input to a power transmission side coil provided in the power transmission device in a contactless manner;
A power supply device comprising: A conversion line used for the power conversion;
A power receiving line used to receive the power for power transmission in a contactless manner;
A switching unit that switches a power transmission line through which power is transmitted to the conversion line or the power receiving line;
A control unit for controlling the operation mode by controlling the switching unit;
With
The conversion line and the power receiving line have a common line that is partially shared,
The power supply device according to claim 1, wherein the coil is provided on the common line. The DC / DC converter includes a capacitor provided on the common line,
The capacitor is
When the operation mode is the conversion mode, it is connected in parallel to the coil and used to perform the power conversion,
The power supply device according to claim 2, wherein when the operation mode is the power reception mode, a series resonance circuit is configured in cooperation with the coil. The DC / DC converter includes two switching elements provided on the common line and connected in series to each other,
The coil is connected to a connection line of both the switching elements, and both switching elements are each provided with a reflux diode,
The controller is
When the operation mode is the conversion mode, the switching elements are alternately turned ON / OFF at a predetermined conversion frequency,
4. The power supply device according to claim 3, wherein both the switching elements are maintained in an OFF state when the operation mode is the power reception mode.   The power supply device according to claim 4, wherein the conversion frequency is different from a resonance frequency of a low-pass filter formed by the coil and the capacitor connected in parallel. A power storage device capable of outputting DC power to the DC / DC converter;
A rectifying unit provided on the power receiving line and rectifying the received power received by the coil;
With
The power reception mode is a charge mode in which the power storage device is charged by the DC power rectified by the rectification unit being input to the power storage device via the power reception line. The power supply device according to any one of the above.   When the operation mode is the conversion mode, the DC power output from the DC / DC converter or the DC power input to the DC / DC converter is smoothed, while the operation mode is the charging mode. The power supply device according to claim 6, further comprising a smoothing capacitor that smoothes the DC power rectified by the rectifying unit. A power storage device;
An inverter that converts DC power into AC power;
With
The conversion mode includes a mode in which DC power of the power storage device is converted into a voltage value by the DC / DC converter, and the DC power converted into the voltage value is converted into AC power by the inverter. One of them is a power supply. A power supply device according to claim 8,
A generator motor driven by input of the AC power;
A vehicle drive device comprising:
The conversion mode includes a mode for converting the regenerative power generated by the generator motor into DC power corresponding to the power storage device.