Power supply device

Abstract

This power supply device comprises: a motor drive unit provided with a field winding energization unit that energizes a field winding of a winding field motor on the basis of DC power from a battery, and an inverter that energizes a stator coil; an AC conversion unit that converts AC power from the outside to DC power; and a converter that converts the converted DC power to DC power with which the battery can be charged. The converter includes a first conversion unit, a second conversion unit, and a transformer. The first conversion unit causes the DC power from the AC conversion unit to fluctuate at a prescribed period and inputs the resulting power to a primary winding of the transformer. The second conversion unit converts AC power from a secondary winding of the transformer to DC power configured from a DC voltage having a voltage value with which the battery can be charged. The field winding energization unit and the second conversion unit are shared.

Description

Technical Field

[0001] The present invention relates to a power supply device mounted on a vehicle.

Background Art

[0002] Conventionally, various motors have been used. As such a motor, for example, there is a wound-field motor in which a field winding is provided on a rotor and a stator coil is provided on a stator. The control device for a rotating electrical machine described in Patent Document 1 cited below includes an inverter that supplies power to the stator coil of the stator based on the output from a battery mounted on a vehicle, and a field power supply circuit that supplies power to the field winding based on the output from the battery. The inverter is configured to have three legs according to the number of phases of the motor, and the field power supply circuit is configured to have two legs so that the direction of the current flowing through the field winding can be changed.

[0003] In addition, some batteries mounted on vehicles are configured to be chargeable based on external power using a charger as described in Patent Document 2.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Here, if a control device that supplies power to a motor based on battery power, as described in Patent Document 1, and a charger that charges the battery, as described in Patent Document 2, are installed in a vehicle, the size occupied by the control device and charger will increase, and the weight will increase. On the other hand, from the perspective of fuel efficiency, weight reduction and miniaturization are desirable for vehicles. For this reason, there is room for improvement when installing a control device that supplies power to a motor based on battery power and a charger that charges the battery in a vehicle.

[0006] Therefore, there is a need for a power supply that is lightweight and compact. [Means for solving the problem]

[0007] The characteristic configuration of the power supply device according to the present invention is a motor drive unit equipped with a field winding energizing unit that energizes the field winding of a wound-field motor with DC power from a battery mounted on a vehicle, and an inverter that energizes the stator coil, an AC / DC conversion unit that converts AC power from an external source into DC power, and a converter that converts the DC power converted by the AC / DC conversion unit into DC power that can charge the battery, wherein the converter has a first conversion unit, a second conversion unit and a transformer, the first conversion unit inputs the DC power from the AC / DC conversion unit to the primary winding of the transformer, and the second conversion unit converts the AC power from the secondary winding of the transformer into DC power that can charge the battery, and the field winding energizing unit and the second conversion unit are shared.

[0008] With this configuration, the field winding energizing section, which energizes the field winding with DC power from the battery, is configured as a so-called full-bridge circuit, and the second conversion section of the converter, which converts AC power from the secondary winding of the transformer into DC power, can also be configured as a full-bridge circuit. Therefore, since the field winding energizing section and the second conversion section are configured as the same circuit, the circuit configuration of the power supply unit can be simplified and the number of components can be reduced by sharing the field winding energizing section and the second conversion section. This makes it possible to make the power supply unit lighter and smaller. [Brief explanation of the drawing]

[0009] [Figure 1] This is a circuit diagram for when the power supply unit is used as a charger. [Figure 2] This is a circuit diagram for when a power supply is used as an AC power output device. [Figure 3] This is a circuit diagram for driving a wound-field motor with a power supply. [Figure 4] This diagram shows the operating status of the power supply unit. [Modes for carrying out the invention]

[0010] The power supply device according to the present invention is configured to drive a wound-field motor mounted on a vehicle, charge a battery mounted on the vehicle, and output AC power based on the battery's output. The power supply device 1 of this embodiment will be described below.

[0011] Figure 1 is a circuit diagram of power supply unit 1. As shown in Figure 1, power supply unit 1 comprises an AC / DC converter 10, a converter 20, a control unit 50, a motor drive unit 60, and a switch 70. Each functional unit is built with a CPU as its core component and consists of hardware, software, or both, to perform processing related to driving the wound-field motor M described above, charging the battery 3, and outputting AC power. Note that although batteries 3 and 5 are shown as being included in each functional unit in Figure 1, batteries 3 and 5 are not actually included in each functional unit.

[0012] The AC / DC converter 10 converts external AC power into DC power. "External" refers to a power source outside the power supply unit 1, and is different from the batteries 3 and 5 mounted on the vehicle. AC power refers to power composed of AC voltages whose voltage value oscillates at a predetermined period. Specifically, the AC voltage corresponds to a 200V (RMS) AC voltage taken from a commercial power supply that oscillates at a commercial frequency (e.g., 50Hz or 60Hz) and is supplied via a single-phase three-wire system. DC power refers to power composed of DC voltages that have a constant voltage value (excluding ripple voltage) relative to a reference voltage. The AC / DC converter 10 converts this AC power, composed of AC voltages, into DC power, composed of DC voltages. The AC / DC converter 10 is provided with a pair of output units 10A and 10B, and outputs the converted DC power to the converter 20 (described later) via this pair of output units 10A and 10B.

[0013] The AC / DC converter 10 has a first leg 11 and a second leg 12. The first leg 11 and the second leg 12 are arranged in parallel with respect to the output units 10A and 10B. As a result, one end 11A of the first leg 11 and one end 12A of the second leg 12 are connected to the output unit 10A, and the other end 11B of the first leg 11 and the other end 12B of the second leg 12 are connected to the output unit 10B.

[0014] The first leg 11 has a high-side switching element 11H and a low-side switching element 11L connected in series. In this embodiment, n-type MOS-FETs (metal-oxide-semiconductor field-effect transistors) are used for the switching elements 11H and 11L. The drain terminal of the switching element 11H is connected to end 11A, and the source terminal is connected to the drain terminal of the switching element 11L. The source terminal of the switching element 11L is connected to end 11B. The gate terminals of the switching elements 11H and 11L are connected to the control unit 50. Diodes 11HD and 11LD are provided between the source terminals and drain terminals of the switching elements 11H and 11L, respectively, with the anode terminal connected to the source terminal and the cathode terminal connected to the drain terminal.

[0015] Furthermore, the second leg 12 has a high-side switching element 12H and a low-side switching element 12L connected in series. In this embodiment, n-type MOS-FETs are also used for the switching elements 12H and 12L. The drain terminal of the switching element 12H is connected to end 12A, and the source terminal is connected to the drain terminal of the switching element 12L. The source terminal of the switching element 12L is connected to end 12B. The gate terminals of the switching elements 12H and 12L are connected to the control unit 50. Diodes 12HD and 12LD are also provided between the source terminals and drain terminals of the switching elements 12H and 12L, respectively, with the anode terminal connected to the source terminal and the cathode terminal connected to the drain terminal.

[0016] A capacitor 15 is provided across the output sections 10A and 10B of the AC / DC converter 10. The capacitor 15 smooths the DC voltage converted by the AC / DC converter 10.

[0017] The reactor coil 30 has one terminal 30B connected to the first node 11N between the two switching elements (switching element 11H and switching element 11L) in the first leg 11. The first node 11N between the two switching elements in the first leg 11 is the line (for example, a wiring pattern on a circuit board or a cable such as a harness) connecting the source terminal of switching element 11H and the drain terminal of switching element 11L. Of course, it may also be the source terminal of switching element 11H or the drain terminal of switching element 11L. The reactor coil 30 has two terminals 30A and 30B, and terminal 30B is connected to the first node 11N.

[0018] AC power is supplied from the other terminal 30A of the reactor coil 30 to the second node 12N between the two switching elements (switching element 12H and switching element 12L) in the second leg 12. The second node 12N between the two switching elements in the second leg 12 is a wire (for example, a wiring pattern on a circuit board or a cable such as a harness) connecting the source terminal of switching element 12H and the drain terminal of switching element 12L. Of course, it may also be the source terminal of switching element 12H or the drain terminal of switching element 12L. Terminal 30A of the reactor coil 30 is connected to one terminal of the supply unit 2 to which AC power is supplied, and the other terminal of the supply unit 2 is connected to the second node 12N. Therefore, the AC / DC conversion unit 10 converts AC power to DC power using the switching elements 11H and 11L of the first leg 11 and the switching elements 12H and 12L of the second leg 12.

[0019] Converter 20 converts the DC power converted by the AC-DC conversion unit 10 into DC power capable of charging the battery 3. The DC power converted by the AC-DC conversion unit 10 is the DC power output from the output units 10A and 10B of the AC-DC conversion unit 10. The battery 3 is a battery mounted on a vehicle charged by the power supply device 1 and is charged based on the DC power from the converter 20. The charging of the battery 3 is performed with a DC voltage of an arbitrary voltage value, but the voltage value of the DC voltage constituting the DC power output from the AC-DC conversion unit 10 is an arbitrary value. The converter 20 converts the voltage value of the DC voltage output from the AC-DC conversion unit 10 into an arbitrary DC voltage required for charging the battery 3.

[0020] The converter 20 of the present embodiment includes a first conversion unit 21, a second conversion unit 22, a third conversion unit 23, and a transformer 24. In the present embodiment, the transformer 24 has a primary winding 24A, a secondary winding 24B, and a tertiary winding 24C, and an insulated multi-port transformer is used.

[0021] The first conversion unit 21 inputs the DC power from the AC-DC conversion unit 10 to the primary winding 24A of the transformer 24. The first conversion unit 21 has a third leg 211 and a fourth leg 212, and the third leg 211 and the fourth leg 212 are provided in parallel with each other with respect to the output units 10A and 10B. Therefore, one end 211A of the third leg 211 and one end 212A of the fourth leg 212 are connected to the output unit 10A, and the other end 211B of the third leg 211 and the other end 212B of the fourth leg 212 are connected to the output unit 10B.

[0022] The third leg 211 has a high-side switching element 211H and a low-side switching element 211L connected in series. The switching element 211H and the switching element 211L use n-type MOS-FETs. For the switching element 211H, the drain terminal is connected to the end 211A, and the source terminal is connected to the drain terminal of the switching element 211L. The source terminal of the switching element 211L is connected to the end 211B. The gate terminals of the switching element 211H and the switching element 211L are each connected to the control unit 50. Also, between the source and drain terminals of each of the switching element 211H and the switching element 211L, diodes 211HD and 211LD are provided, where the anode terminal is connected to the source terminal and the cathode terminal is connected to the drain terminal.

[0023] The fourth leg 212 has a high-side switching element 212H and a low-side switching element 212L connected in series. The switching element 212H and the switching element 212L use n-type MOS-FETs. For the switching element 212H, the drain terminal is connected to the end 212A, and the source terminal is connected to the drain terminal of the switching element 212L. The source terminal of the switching element 212L is connected to the end 212B. The gate terminals of the switching element 212H and the switching element 212L are each connected to the control unit 50. Also, between the source and drain terminals of each of the switching element 212H and the switching element 212L, diodes 212HD and 212LD are provided, where the anode terminal is connected to the source terminal and the cathode terminal is connected to the drain terminal.

[0024] The primary winding 24A is provided across the third node 211N between two switching elements (switching element 211H and switching element 211L) in the third leg 211, and the fourth node 212N between two switching elements (switching element 212H and switching element 212L) in the fourth leg 212. In this embodiment, the starting end of the primary winding 24A is connected to the third node 211N, and the ending end of the primary winding 24A is connected to the fourth node 212N.

[0025] A current (alternating current) flows through the secondary winding 24B, corresponding to the turns ratio between the primary winding 24A and the secondary winding 24B. Additionally, a voltage (alternating voltage) is generated, also corresponding to the turns ratio between the primary winding 24A and the secondary winding 24B.

[0026] The second conversion unit 22 rectifies the AC power from the secondary winding 24B of the transformer 24 and converts it into DC power that can charge the battery 3. The second conversion unit 22 has a fifth leg 221 and a sixth leg 222, which are arranged in parallel with each other to the output units 20A and 20B of the converter 20. Therefore, one end 221A of the fifth leg 221 and one end 222A of the sixth leg 222 are connected to the output unit 20A, and the other end 221B of the fifth leg 221 and the other end 222B of the sixth leg 222 are connected to the output unit 20B.

[0027] The fifth leg 221 has a high-side switching element 221H and a low-side switching element 221L connected in series. n-type MOS-FETs are used for both switching elements 221H and 221L. The drain terminal of switching element 221H is connected to end 221A, and the source terminal is connected to the drain terminal of switching element 221L. The source terminal of switching element 221L is connected to end 221B. The gate terminals of switching elements 221H and 221L are connected to the control unit 50. Diodes 221HD and 221LD are provided between the source terminals and drain terminals of switching elements 221H and 221L, respectively, with their anode terminals connected to the source terminals and their cathode terminals connected to the drain terminals.

[0028] The sixth leg 222 has a high-side switching element 222H and a low-side switching element 222L connected in series. n-type MOS-FETs are used for both switching elements 222H and 222L. The drain terminal of switching element 222H is connected to end 222A, and the source terminal is connected to the drain terminal of switching element 222L. The source terminal of switching element 222L is connected to end 222B. The gate terminals of switching elements 222H and 222L are connected to the control unit 50. Diodes 222HD and 222LD are provided between the source terminals and drain terminals of switching elements 222H and 222L, respectively, with their anode terminals connected to the source terminals and their cathode terminals connected to the drain terminals.

[0029] The secondary winding 24B described above is provided across the fifth node 221N between two switching elements (switching element 221H and switching element 221L) in the fifth leg 221 and the sixth node 222N between two switching elements (switching element 222H and switching element 222L) in the sixth leg 222. In this embodiment, the starting end of the secondary winding 24B is connected to the fifth node 221N via the reactor L, and the ending end of the secondary winding 24B is connected to the sixth node 222N.

[0030] A capacitor 25 is provided across the output sections 20A and 20B of the converter 20. The capacitor 25 smooths the DC voltage converted by the converter 20.

[0031] A current (alternating current) flows through the tertiary winding 24C in proportion to the turns ratio between the primary winding 24A and the tertiary winding 24C, and a voltage (alternating voltage) is generated in proportion to the turns ratio between the primary winding 24A and the tertiary winding 24C. The third conversion unit 23 rectifies the voltage (alternating voltage) generated in the tertiary winding 24C and converts it into DC power consisting of a DC voltage with a voltage value lower than the DC voltage output from the second conversion unit 22 (for example, 12V).

[0032] In this embodiment, the tertiary winding 24C has a first tertiary winding 24CA and a second tertiary winding 24CB. The first tertiary winding 24CA and the second tertiary winding 24CB are provided with the starting end of the first tertiary winding 24CA and the ending end of the second tertiary winding 24CB connected. A switching element S9 with a drain terminal connected is provided at the starting end of the first tertiary winding 24CA, and a switching element S10 with a drain terminal connected is provided at the ending end of the second tertiary winding 24CB. The source terminals of the switching element S9 and the source terminals of the switching element S10 are connected to terminal 20D. The gate terminals of the switching element S9 and the switching element S10 are connected to the control unit 50. Furthermore, diodes S9D and S10D are provided between the source terminal and drain terminal of switching element S9 and switching element S10, respectively, with the anode terminal connected to the source terminal and the cathode terminal connected to the drain terminal.

[0033] The end of the first tertiary winding 24CA and the beginning of the second tertiary winding 24CB are connected to one terminal of the reactor coil 23L. The other terminal of the reactor coil 23L is connected to terminal 20C. Furthermore, a capacitor 26 is provided spanning terminals 20C and 20D. The third conversion unit 23 converts the AC power generated in the tertiary winding 24C into DC power consisting of a DC voltage by synchronous rectification using switching elements S9 and S10.

[0034] The switching unit 40 switches the conversion operation of the converter 20. The conversion operation of the converter 20 refers to the operation performed by the converter 20 to convert AC power to DC power and the operation to convert DC power to AC power.

[0035] In this embodiment, the converter 20 is switched between one of the first conversion state and the second conversion state by the switching unit 40. The first conversion state is a state in which the converter 20 converts the DC power from the AC / DC conversion unit 10 into DC power consisting of a DC voltage of a predetermined first voltage value, and the power supply unit 1 is used as a charger. The second conversion state is a state in which the converter 20 converts the DC power from the battery 3 into DC power consisting of a DC voltage of a predetermined second voltage value, and the power supply unit 1 is used as an AC power output device.

[0036] The switching unit 40 can be configured, for example, using a relay. As shown in Figure 1, when the switching unit 40 is operated so that terminal 0 and terminal 1 are connected, AC power supplied from the supply unit 2 is input to the AC / DC converter 10 via the reactor coil 30. Also, as shown in Figure 2, when the switching unit 40 is operated so that terminal 0 and terminal 3 are connected, AC power generated based on DC power from the battery 3 (for example, AC power with an effective voltage of 100V) can be taken out from the outlet 4 via the reactor coil 30.

[0037] Therefore, when there is a charge request to charge the battery 3, the switching unit 40 switches the converter 20 to the first conversion state, and when there is an output request to output DC power consisting of a DC voltage of a second voltage value from the AC / DC conversion unit 10, the switching unit 40 switches the converter 20 to the second conversion state. In other words, when the switching unit 40 is operated to connect terminal 0 and terminal 1 as a charge request to charge the battery 3, it switches the converter 20 to the first conversion state, and when the switching unit 40 is operated to connect terminal 0 and terminal 3 as an output request to output DC power from the AC / DC conversion unit 10, it switches the converter 20 to the second state.

[0038] The control unit 50 alternately drives the switching elements 11H and 11L of the first leg 11, and the second leg 12 alternately drives the switching elements 12H and 12L at the grid frequency. This enables the AC / DC conversion unit 10 to convert AC power to DC power based on the driving of the switching elements of the first leg 11 and the second leg 12.

[0039] Furthermore, the control unit 50 alternately drives the switching element 211H of the third leg 211 and the switching element 212L of the fourth leg 212, and the switching element 211L of the third leg 211 and the switching element 212H of the fourth leg 212. As a result, the DC power from the AC / DC conversion unit 10 is amplified and input to the primary winding 24A, making it possible to generate AC power in the secondary winding 24B in proportion to the turns ratio between the primary winding 24A and the secondary winding 24B.

[0040] Furthermore, the control unit 50 alternately drives the switching element 221H of the fifth leg 221 and the switching element 222L of the sixth leg 222, and the switching element 221L of the fifth leg 221 and the switching element 222H of the sixth leg 222. This makes it possible to convert the AC power generated in the secondary winding 24B into DC power.

[0041] By setting the turns ratio of the primary winding 24A and the secondary winding 24B to correspond to the ratio of the AC voltage applied to the primary winding 24A to the DC voltage used to charge the battery 3, it becomes possible to generate DC power (e.g., 200V) suitable for charging the battery 3 at the output units 20A and 20B, thereby enabling the battery 3 to be charged.

[0042] An AC voltage corresponding to the turns ratio between the primary winding 24A and the tertiary winding 24C is generated in the tertiary winding 24C. This voltage is rectified by the switching elements S9 and S10, the reactor coil 23L, and the capacitor 26, and DC power consisting of a DC voltage of a predetermined value is output from terminals 20C and 20D. For example, by setting this voltage to 12V, it becomes possible not only to charge the battery 3 with the power supply unit 1, but also to charge a 12V battery 5 installed in a different vehicle from the battery 3.

[0043] As described above, in this embodiment, the second conversion unit 22 converts the power to AC power with a voltage suitable for charging battery 3, and the third conversion unit 23 converts the power to AC power with a voltage suitable for charging battery 5. Also, as mentioned above, battery 3 outputs a voltage with a higher voltage value than battery 5. Therefore, the output voltage value of the secondary winding 24B is configured to be higher than the output voltage value of the tertiary winding 24C.

[0044] Furthermore, when using the power charged in the battery 3 to output AC power from the outlet 4, the control unit 50 alternately drives the switching element 221H of the fifth leg 221 and the switching element 222L of the sixth leg 222, and the switching element 221L of the fifth leg 221 and the switching element 222H of the sixth leg 222. As a result, the DC power from the battery 3 is amplified and input to the secondary winding 24B, making it possible to generate AC power in the primary winding 24A according to the turns ratio between the primary winding 24A and the secondary winding 24B.

[0045] The control unit 50 alternately drives the switching element 211H of the third leg 211 and the switching element 212L of the fourth leg 212, and the switching element 211L of the third leg 211 and the switching element 212H of the fourth leg 212. As a result, the AC voltage generated in the primary winding 24A is converted into a DC voltage. This DC voltage becomes the voltage obtained by transforming the output voltage of the battery 3 according to the turns ratio of the primary winding 24A and the secondary winding 24B.

[0046] Furthermore, the control unit 50 alternately drives the switching element 11H of the first leg 11 and the switching element 12L of the second leg 12, and the switching element 11L of the first leg 11 and the switching element 12H of the second leg 12. As a result, the switching elements of the first leg 11 and the second leg 12 are driven, and the DC voltage from the battery 3 is converted into AC power that is different from the AC power input to the AC / DC conversion unit 10. In other words, when charging the battery 3, an AC voltage of 200V is applied to the AC / DC conversion unit 10, but it becomes possible to output an AC voltage of, for example, 100V from the power (DC power) stored in the battery 3.

[0047] The motor drive unit 60 drives the wound-field motor M based on DC power from the battery 3 mounted on the vehicle. The battery 3 mounted on the vehicle is a battery that is charged based on the DC power converted by the second conversion unit 22 described above. The wound-field motor M has a field winding Lf on the rotor and a stator coil Ls on the stator.

[0048] The motor drive unit 60 includes a field winding energizing unit 61 and an inverter 62. The field winding energizing unit 61 energizes the field winding Lf of the wound-field motor M using DC power from the battery 3. In the power supply unit 1, this field winding energizing unit 61 is shared with the second conversion unit 22 described above. Therefore, the field winding energizing unit 61 energizes the field winding Lf using the fifth leg 221 and the sixth leg 222 of the second conversion unit 22 described above.

[0049] The field winding Lf is provided via brushes and slip rings (neither shown) across the fifth node 221N between two switching elements (switching element 221H and switching element 221L) in the fifth leg 221 and the sixth node 222N between two switching elements (switching element 222H and switching element 222L) in the sixth leg 222. In this embodiment, one terminal of the field winding Lf is connected to the fifth node 221N via a switch 70, which will be described later.

[0050] When the control unit 50 drives the wound-field motor M using the DC power charged in the battery 3, it alternately drives the switching element 221H of the fifth leg 221 and the switching element 222L of the sixth leg 222, and the switching element 221L of the fifth leg 221 and the switching element 222H of the sixth leg 222. This switches the direction of the current flowing through the field winding Lf, thereby energizing it.

[0051] The inverter 62 energizes the stator coil Ls. The inverter 62 has a seventh leg 63, an eighth leg 64, and a ninth leg 65. The seventh leg 63, the eighth leg 64, and the ninth leg 65 are arranged in parallel with each other between a first power line 62A and a second power line 62B which is connected to a potential lower than the potential of the first power line 62A. The first power line 62A is connected to the positive terminal of the battery 3, and the second power line 62B is connected to the negative terminal of the battery 3. As a result, one end 63A of the seventh leg 63, one end 64A of the eighth leg 64, and one end 65A of the ninth leg 65 are connected to the first power line 62A, and the other end 63B of the seventh leg 63, the other end 64B of the eighth leg 64, and the other end 65B of the ninth leg 65 are connected to the second power line 62B.

[0052] The seventh leg 63 has a high-side switching element 63H and a low-side switching element 63L connected in series. In this embodiment, n-type MOS-FETs are used for switching elements 63H and 63L. The drain terminal of switching element 63H is connected to end 63A, and the source terminal is connected to the drain terminal of switching element 63L. The source terminal of switching element 63L is connected to end 63B. The gate terminals of switching elements 63H and 63L are connected to the control unit 50. Diodes 63HD and 63LD are provided between the source terminals and drain terminals of switching elements 63H and 63L, respectively, with the anode terminal connected to the source terminal and the cathode terminal connected to the drain terminal.

[0053] Furthermore, the eighth leg 64 has a high-side switching element 64H and a low-side switching element 64L connected in series. In this embodiment, n-type MOS-FETs are used for the switching elements 64H and 64L. The drain terminal of the switching element 64H is connected to end 64A, and the source terminal is connected to the drain terminal of the switching element 64L. The source terminal of the switching element 64L is connected to end 64B. The gate terminals of the switching elements 64H and 64L are connected to the control unit 50. Diodes 64HD and 64LD are provided between the source terminals and drain terminals of the switching elements 64H and 64L, respectively, with the anode terminal connected to the source terminal and the cathode terminal connected to the drain terminal.

[0054] Furthermore, the ninth leg 65 has a high-side switching element 65H and a low-side switching element 65L connected in series. In this embodiment, n-type MOS-FETs are used for the switching elements 65H and 65L. The drain terminal of the switching element 65H is connected to end 65A, and the source terminal is connected to the drain terminal of the switching element 65L. The source terminal of the switching element 65L is connected to end 65B. The gate terminals of the switching elements 65H and 65L are connected to the control unit 50. Diodes 65HD and 65LD are also provided between the source terminals and drain terminals of the switching elements 65H and 65L, respectively, with the anode terminal connected to the source terminal and the cathode terminal connected to the drain terminal.

[0055] The source terminals of switching element 63H, switching element 64H, and switching element 65H are each connected to three terminals of the wound-field motor M.

[0056] The control unit 50 closes the high-side switching element of a predetermined leg among the three legs (the seventh leg 63, the eighth leg 64, and the ninth leg 65), and the low-side switching element of one of the other two legs that are different from the predetermined leg, thereby allowing current to flow between two of the three terminals of the wound field motor M using PWM control.

[0057] As mentioned above, the three legs are the seventh leg 63, the eighth leg 64, and the ninth leg 65. The "high-side switching element of a predetermined leg among the three legs (seventh leg 63, eighth leg 64, and ninth leg 65), and the low-side switching element of one of the other two legs that are different from the predetermined leg" mentioned above refers, for example, to the high-side switching element of the seventh leg 63, and to the low-side switching element of one of the eighth leg 64 and the ninth leg 65. Therefore, when these high-side switching elements and low-side switching elements are simultaneously closed, the switching elements that prevent so-called through-current from flowing from the first power line 62A to the second power line 62B are closed.

[0058] The three terminals of the wound-field motor M are the U-phase terminal, the V-phase terminal, and the W-phase terminal. For example, when the switching element 63H of the 7th leg 63 and the switching element 64L of the 8th leg 64 are closed, current flows from the U-phase terminal to the V-phase terminal of the wound-field motor M via PWM control. Also, for example, when the switching element 64H of the 8th leg 64 and the switching element 63L of the 7th leg 63 are closed, current flows from the V-phase terminal to the U-phase terminal of the wound-field motor M via PWM control.

[0059] When driving the wound-field motor M, the control unit 50 supplies current while sequentially switching the stator coils Ls of the wound-field motor M. Therefore, while the wound-field motor M is being driven, current is supplied while sequentially switching two of the three terminals of the wound-field motor M described above.

[0060] Furthermore, it is possible to configure the system so that, for example, the PWM signal output from the control unit 50 is input to a driver (not shown), and the driver improves the driving capability of the PWM signal before inputting it to the inverter 62.

[0061] The switch 70 is configured to switch between a first state and a second state. In this embodiment, in the first state, the secondary winding 24B and the second conversion unit 22 are electrically connected, while the field winding Lf and the field winding energizing unit 61 are electrically isolated. In this case, as shown in Figures 1 and 2, the switch 70 is operated so that terminal 0 and terminal 3 are connected, and the second conversion unit 22 converts the AC power generated at both ends of the secondary winding 24B into DC power. Therefore, it becomes possible to charge the battery 3 based on the AC power from the supply unit 2. When the switching unit 40 is switched to the state shown in Figure 2, the second conversion unit 22 converts the DC voltage from the battery 3 into an AC voltage. Therefore, it becomes possible to output AC power from the outlet 4 based on the DC power from the battery 3.

[0062] Furthermore, when terminals 0 and 3 of switch 70 are connected, the field winding energizing section 61 is disconnected from the wound-field motor M, and therefore DC power from battery 3 is not supplied to the field winding energizing section 61. Consequently, in this case, the wound-field motor M is stopped. In this first state, the control unit 50 should stop supplying power to the switching elements of the inverter 62.

[0063] In the second state, the secondary winding 24B and the second conversion unit 22 are electrically isolated, while the field winding Lf and the field winding energizing unit 61 are electrically connected. In this case, as shown in Figure 3, the switch 70 is operated so that terminal 0 and terminal 1 are connected, and the second conversion unit 22 is disconnected from the secondary winding 24B. Therefore, the power supply unit 1 is unable to charge the battery 3 based on the AC power from the supply unit 2, and is unable to convert the DC voltage from the battery 3 to an AC voltage.

[0064] Furthermore, when terminals 0 and 1 of switch 70 are connected, the field winding energizing section 61 is electrically connected to the wound-field motor M, and therefore DC power from battery 3 is supplied to the field winding energizing section 61. Consequently, in this case, the wound-field motor M is driven. In this second state, the control unit 50 may stop the power supply to the switching elements of the AC / DC converter 10, the first converter 21, and the third converter 23, respectively.

[0065] Figure 4 shows the operating state of the power supply unit 1 as set based on the switching unit 40 and the switch 70. As shown in Figure 4, when the switching unit 40 is in the first conversion state (terminal 0 and terminal 1 are connected) and the switch 70 is in the first state (terminal 0 and terminal 3 are connected), the power supply unit 1 is in a state where it can charge the battery 3 based on AC power from an external source (#1).

[0066] Furthermore, when the switching unit 40 is in the second conversion state (with terminal 0 and terminal 3 connected) and the switch 70 is in the first state (with terminal 0 and terminal 3 connected), the power supply unit 1 is in a state where it can output AC power from the outlet 4 (#2).

[0067] Furthermore, when the switching unit 40 is in the first conversion state (terminal 0 and terminal 1 are connected) and the switch 70 is in the second state (terminal 0 and terminal 1 are connected), the power supply unit 1 is configured to drive the wound-field motor M with DC power from the battery 3 (#3). Also, when the switching unit 40 is in the second conversion state (terminal 0 and terminal 3 are connected) and the switch 70 is in the second state (terminal 0 and terminal 1 are connected), the power supply unit 1 is configured to drive the wound-field motor M with DC power from the battery 3 (#4).

[0068] As described above, by configuring the power supply unit 1 in this way, the field winding energizing section 61, which energizes the field winding Lf with DC power from the battery 3, is configured as a so-called full-bridge circuit, and the second conversion section 22 of the converter 20, which converts AC power from the secondary winding 24B of the transformer 24 into DC power, can also be configured as a full-bridge circuit. Therefore, since the field winding energizing section 61 and the second conversion section 22 are configured as the same circuit, the circuit configuration of the power supply unit 1 can be simplified and the number of components can be reduced by sharing the field winding energizing section 61 and the second conversion section 22. This makes it possible to make the power supply unit 1 lighter and smaller.

[0069] Furthermore, in the first state, current can be prevented from flowing through the field winding Lf, and in the second state, current can be prevented from flowing through the secondary winding 24B. Therefore, in both the first and second states, current can be prevented from flowing to unnecessary parts, thereby suppressing component degradation. In addition, it becomes possible to reduce power consumption.

[0070] Furthermore, the battery 3 can be charged via the secondary winding 24B, and the battery 5, which outputs a voltage lower than the output voltage of the battery 3, can be charged via the tertiary winding 24C. Also, when driving a wound-field motor M, it can be driven based on the output of the battery 3, which has a higher voltage value.

[0071] Furthermore, the configurations disclosed in the above embodiments can be applied in combination with configurations disclosed in other embodiments, provided that no inconsistencies arise. Regarding other configurations, the embodiments disclosed herein are merely illustrative in all respects. Therefore, various modifications can be made as appropriate, without departing from the spirit of this disclosure.

[0072] [Other Embodiments] In the above embodiment, the switching elements of the AC / DC converter 10 and the converter 20 were described as n-type MOS-FETs, but the switching elements may also be p-type MOS-FETs, or other switching elements (for example, IGBTs or bipolar transistors).

[0073] In the above embodiment, it was explained that AC power is output from the outlet 4 based on DC power from the battery 3, but the power supply unit 1 does not necessarily have to have an outlet 4.

[0074] In the above embodiment, the power supply unit 1 was described as being equipped with a switch 70. However, the power supply unit 1 can also be configured without a switch 70. In this case, terminals 0 and 1 of the switch 70 are connected, and terminals 0 and 3 are connected. In such a configuration, when the power supply unit 1 charges the battery 3 based on AC power from an external source, and when it outputs AC power from the outlet 4, the control unit 50 opens all the switching elements of the inverter 62. When the power supply unit 1 drives the wound-field motor M based on DC power from the battery 5, the control unit 50 opens all the switching elements of the AC / DC converter 10 and the first converter 21.

[0075] In the above embodiment, the transformer 24 was described as an isolated multiport transformer having a primary winding 24A, a secondary winding 24B, and a tertiary winding 24C. However, the transformer 24 may also have a primary winding 24A and a secondary winding 24B.

[0076] [Summary of the above embodiment] The following describes the overview of the power supply unit 1 as explained above.

[0077] The power supply unit 1 includes a motor drive unit 60 equipped with a field winding energizing unit 61 that energizes the field winding Lf of a wound-field motor M using DC power from a battery 3 mounted on the vehicle, and an inverter 62 that energizes the stator coil Ls; an AC / DC conversion unit 10 that converts AC power from an external source into DC power; and a converter 20 that converts the DC power converted by the AC / DC conversion unit 10 into DC power that can charge the battery 3. The converter 20 has a first conversion unit 21, a second conversion unit 22, and a transformer 24. The first conversion unit 21 inputs DC power from the AC / DC conversion unit 10 to the primary winding 24A of the transformer 24, and the second conversion unit 22 converts AC power from the secondary winding 24B of the transformer 24 into DC power that can charge the battery 3. The field winding energizing unit 61 and the second conversion unit 22 are shared.

[0078] In this configuration, the field winding energizing section 61, which energizes the field winding Lf with DC power from the battery 3, is configured as a so-called full-bridge circuit, and the second conversion section 22 of the converter 20, which converts AC power from the secondary winding 24B of the transformer 24 into DC power, can also be configured as a full-bridge circuit. Therefore, since the field winding energizing section 61 and the second conversion section 22 are configured as the same circuit, the circuit configuration of the power supply unit 1 can be simplified and the number of components can be reduced by sharing the field winding energizing section 61 and the second conversion section 22. As a result, the power supply unit 1 can be made lighter and smaller.

[0079] Furthermore, it is preferable that the power supply unit 1 further includes a switch 70 that can switch between a first state in which the secondary winding 24B and the second conversion unit 22 are electrically connected and the field winding Lf and the field winding energizing unit 61 are electrically separated, and a second state in which the secondary winding 24B and the second conversion unit 22 are electrically separated and the field winding Lf and the field winding energizing unit 61 are electrically connected.

[0080] With this configuration, current can be prevented from flowing through the field winding Lf in the first state, and current can be prevented from flowing through the secondary winding 24B in the second state. Therefore, in both the first and second states, current can be prevented from flowing to unnecessary parts, thereby suppressing component degradation. Furthermore, it becomes possible to reduce power consumption.

[0081] Furthermore, the power supply unit 1 preferably has an isolated multi-port transformer 24 having a primary winding 24A, a secondary winding 24B, and a tertiary winding 24C, where the voltage value of the output voltage of the secondary winding 24B is higher than the voltage value of the output voltage of the tertiary winding 24C.

[0082] With this configuration, battery 3 can be charged via the secondary winding 24B, and battery 5 can be charged via the tertiary winding 24C, which outputs a voltage lower than the output voltage of battery 3. Furthermore, when driving a wound-field motor M, it can be driven based on the output of battery 3, which has a higher voltage value.

[0083] Furthermore, the power supply unit 1 has a second conversion unit 22 which has a fifth leg 221 and a sixth leg 222 (two legs) provided in parallel with each other across the positive and negative terminals of the battery 3, and the fifth leg 221 and the sixth leg 222 are each composed of high-side switching elements 221H, 222H and low-side switching elements 221L, 222L connected in series.

[0084] With this configuration, by driving the high-side switching elements 221H, 222H and the low-side switching elements 221L, 222L of the fifth leg 221 and the sixth leg 222, it becomes possible to use the system for converting AC power and DC power from one to the other, and for converting AC power and DC power from the other to the other.

[0085] Furthermore, the power supply unit 1 is configured such that when the switch 70 is in the first state, the second conversion unit 22 supplies AC power from the secondary winding 24B to the fifth node 221N (node) between the high-side switching element 221H and the low-side switching element 221L in the fifth leg 221, and to the sixth node 222N (node) between the high-side switching element 222H and the low-side switching element 222L in the sixth leg 222. When the switch 70 is in the second state, the second conversion unit 22 is configured to supply current to the field winding Lf from the fifth node 221N and the sixth node 222N.

[0086] With this configuration, the switch 70 can be switched between charging the battery 3 and energizing the field winding Lf depending on the state, making it possible to use the second conversion unit 22 as the field winding energizing unit 61. [Industrial applicability]

[0087] The technology disclosed herein can be used in power supply devices installed in vehicles. [Explanation of symbols]

[0088] 1: Power supply unit, 3: Battery, 10: AC / DC converter, 20: Converter, 21: First converter, 22: Second converter, 24: Transformer, 24A: Primary winding, 24B: Secondary winding, 24C: Tertiary winding, 60: Motor drive unit, 61: Field winding energizing unit, 62: Inverter, 70: Switch, 221: Fifth leg, 221H: Switching element, 221L: Switching element, 221N: Fifth node, 222: Sixth leg, 222H: Switching element, 222L: Switching element, 222N: Sixth node, Lf: Field winding, Ls: Stator coil, M: Wound field motor

Claims

1. A motor drive unit equipped with a field winding energizing section that energizes the field windings of a wound-field motor using DC power from a battery mounted on the vehicle, and an inverter that energizes the stator coil, An AC / DC converter that converts external AC power to DC power, The system includes a converter that converts the DC power converted by the AC / DC conversion unit into DC power that can charge the battery, The converter comprises a first conversion unit, a second conversion unit, and a transformer. The first conversion unit inputs the DC power from the AC / DC conversion unit to the primary winding of the transformer. The second conversion unit converts the AC power from the secondary winding of the transformer into DC power that can charge the battery. A power supply device in which the field winding energizing section and the second conversion section are shared.

2. The power supply device according to claim 1, further comprising a switch that can switch between a first state in which the secondary winding and the second conversion unit are electrically connected and the field winding and the field winding energizing unit are electrically separated, and a second state in which the secondary winding and the second conversion unit are electrically separated and the field winding and the field winding energizing unit are electrically connected.

3. The transformer is an isolated multiport transformer having the primary winding, the secondary winding, and the tertiary winding, The power supply device according to claim 1 or 2, wherein the voltage value of the output voltage of the secondary winding is higher than the voltage value of the output voltage of the tertiary winding.

4. The second conversion unit has two legs that are provided in parallel with each other across the positive and negative terminals of the battery. The power supply device according to claim 2, wherein each of the two legs comprises a high-side switching element and a low-side switching element connected in series.

5. The second conversion unit is, When the switch is in the first state, AC power is supplied from the secondary winding to the node between the high-side switching element and the low-side switching element in one of the two legs, and to the node between the high-side switching element and the low-side switching element in the other of the two legs. The power supply device according to claim 4, wherein when the switch is in the second state, current is supplied to the field winding from the two nodes.

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