Power supply device

Abstract

To provide a power supply device that can easily be controlled.SOLUTION: A power supply device 1 comprises: an inverter 10 in which a first leg 11 having a switching element 11H and a switching element 11L and a second leg 12 having a switching element 12H and a switching element 12L are arranged in parallel; and a converter 20 in which a multi-port transformer 24 including a primary coil 24A, a secondary coil 24B, and a third coil 24C is arranged. The converter 20 comprises: an input unit 21 for inputting a direct-current power from the inverter 10 into the primary coil 24A with the power oscillated at a prescribed period; a first conversion unit 22 for converting an alternating-current power generated in the secondary coil 24B into a direct-current power; and a second conversion unit 23 for converting an alternating-current power generated in the third coil 24C into a direct-current power. The second conversion unit 23 converts the alternating-current power generated in the third coil 24C into the direct-current power using a synchronous rectification technique.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a power supply device that charges and discharges a battery mounted on a vehicle. [Background technology]

[0002] Conventionally, power supply devices have been used that output DC voltages with different voltage values ​​in response to input of AC power. Examples of such power supply devices include those described in Patent Documents 1 to 5, the sources of which are listed below.

[0003] Patent Documents 1 to 3 describe power conversion devices. Patent Documents 4 and 5 describe switching power supply devices. The power conversion devices of Patent Documents 1 to 3 and the switching power supply devices of Patent Documents 4 and 5 are used to output a DC voltage of a first voltage value capable of charging a battery, or a DC voltage of a second voltage value lower than the first voltage value, for example. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-140126 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-158353 [Patent Document 3] International Publication No. 2015 / 174331 [Patent Document 4] Japanese Patent Application Laid-Open No. 2008-206304 [Patent Document 5] Japanese Patent Application Laid-Open No. 2009-232502 Summary of the Invention [Problem to be solved by the invention]

[0005] The power conversion devices of Patent Documents 1 to 3 and the switching power supply devices of Patent Documents 4 and 5 are large in overall size and cost. Furthermore, when using a multi-port transformer to simultaneously output DC voltages of different voltage values, for example, the control becomes complicated and output cannot be easily achieved.

[0006] Therefore, there is a demand for a power supply device that can easily output DC voltages with different voltage values. [Means for solving the problem]

[0007] A characteristic configuration of a power supply device according to the present invention is that it includes an inverter having a first leg in which a high-side switching element and a low-side switching element are connected in series and a second leg in which a high-side switching element and a low-side switching element are connected in series, which are arranged in parallel to each other, for converting AC power to DC power; and a converter having an isolated multi-port transformer having a primary winding, a secondary winding, and a tertiary winding, for converting the DC power from the inverter into DC power composed of a DC voltage of a first voltage value for charging a battery, wherein the converter has an input unit that amplifies the DC power from the inverter at a predetermined period and inputs it to the primary winding, a first conversion unit that converts the AC power generated in the secondary winding into DC power composed of a DC voltage of the first voltage value, and a second conversion unit that converts the AC power generated in the tertiary winding into DC power composed of a DC voltage of a second voltage value lower than the first voltage value, and the second conversion unit converts the AC power generated in the tertiary winding into DC power composed of a DC voltage of the second voltage value by synchronous rectification.

[0008] With this characteristic configuration, it is possible to output DC power consisting of a DC voltage of a first voltage value from the first conversion unit of the converter, and simultaneously output DC power consisting of a DC voltage of a second voltage value from the second conversion unit. Furthermore, with the above-described characteristic configuration, it is possible to easily output DC power consisting of a DC voltage of a first voltage value and DC power consisting of a DC voltage of a second voltage value with a simple configuration.

[0009] The input unit includes a third leg in which a high-side switching element and a low-side switching element are connected in series, and a fourth leg in which a high-side switching element and a low-side switching element are connected in series, which are provided in parallel to each other; the first conversion unit includes a fifth leg in which a high-side switching element and a low-side switching element are connected in series, and a sixth leg in which a high-side switching element and a low-side switching element are connected in series, which are provided in parallel to each other; the high-side switching element of the third leg and the low-side switching element of the fourth leg are shifted by a preset first shift amount to be in a closed state; and the high-side switching element of the fifth leg and the low-side switching element of the sixth leg are closed with a shift by the first shift amount, the high-side switching element of the fifth leg and the low-side switching element of the sixth leg are closed with a shift by the first shift amount, the low-side switching element of the fifth leg and the high-side switching element of the sixth leg are closed with a shift by the first shift amount, and when charging the battery, the high-side switching element of the fifth leg is closed a second shift amount smaller than the first shift amount by which the high-side switching element of the third leg is closed, and the high-side switching element of the sixth leg is closed the second shift amount by which the high-side switching element of the fourth leg is closed.

[0010] With this configuration, the battery can be charged based on the AC power supplied to the inverter, and at the same time, a DC voltage having a voltage value different from the DC voltage used to charge the battery can be supplied to a load other than the battery.

[0011] The input unit includes a third leg in which a high-side switching element and a low-side switching element are connected in series, and a fourth leg in which a high-side switching element and a low-side switching element are connected in series, which are provided in parallel to each other; the first conversion unit includes a fifth leg in which a high-side switching element and a low-side switching element are connected in series, and a sixth leg in which a high-side switching element and a low-side switching element are connected in series, which are provided in parallel to each other; the high-side switching element of the third leg and the low-side switching element of the fourth leg are shifted by a preset first shift amount to be in a closed state; the low-side switching element of the third leg and the high-side switching element of the fourth leg are shifted by the first shift amount to be in a closed state; Preferably, when the low-side switching element of the fifth leg and the high-side switching element of the sixth leg are closed with a shift by the first shift amount, the low-side switching element of the fifth leg and the high-side switching element of the sixth leg are closed with a shift by the first shift amount, and the low-side switching element of the fifth leg and the high-side switching element of the sixth leg are closed with a shift by the first shift amount, and the second conversion unit generates DC power consisting of a DC voltage of the second voltage value based on the electrical energy charged in the battery, the high-side switching element of the fifth leg is closed a second shift amount smaller than the first shift amount after the high-side switching element of the third leg is closed, and the high-side switching element of the sixth leg is closed the second shift amount before the high-side switching element of the fourth leg is opened.

[0012] With this configuration, when AC power is not being supplied to the inverter, a DC voltage having a voltage value different from the voltage value of the battery's output voltage can be supplied to a load other than the battery based on the electrical energy charged in the battery.

[0013] In addition, the tertiary winding is composed of a first tertiary winding and a second tertiary winding, and the average value of the combined current of the current flowing through the first tertiary winding and the current flowing through the second tertiary winding can be set to zero.

[0014] Preferably, the DC voltage of the second voltage value is controlled based on the first shift amount.

[0015] With this configuration, the output of the DC voltage of the second voltage value can also be controlled based on the control of the output of the DC voltage of the first voltage value, making it possible to output DC voltages of different voltage values ​​with simple control.

[0016] Preferably, the second shift amount is set based on a power command value of the DC power output from the first conversion unit and an estimated power value of the DC power output from the first conversion unit.

[0017] With this configuration, the second shift amount can be easily set, and therefore DC voltages of different voltage values ​​can be output with simple control. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a circuit diagram illustrating a configuration of a power supply device. [Figure 2] 10 is a timing chart of the power supply device when charging the battery. [Figure 3] 10 is a timing chart of the power supply device when outputting DC power based on the output from the battery. DETAILED DESCRIPTION OF THE INVENTION

[0019] The power supply device according to the present invention is capable of charging and discharging a battery mounted on a vehicle, and is capable of outputting DC power composed of DC voltages having different voltage values ​​from a plurality of terminals. The power supply device 1 of this embodiment will now be described.

[0020] Fig. 1 is a circuit diagram of a power supply device 1. As shown in Fig. 1, the power supply device 1 is configured to include an inverter 10, a converter 20, a reactor coil 30, and a control unit 50. Each functional unit is constructed using hardware or software, or both, with a CPU as its core component, in order to perform the processing related to the output of DC power described above.

[0021] The inverter 10 converts AC power into DC power and outputs it. In this embodiment, AC power refers to power composed of an AC voltage whose voltage value oscillates at a predetermined cycle. Specifically, the AC voltage oscillates at a commercial frequency (e.g., 50 Hz or 60 Hz) and corresponds to an AC voltage of 200 V (effective value) extracted from a single-phase, three-wire commercial power supply. DC power refers to power composed of a DC voltage whose voltage value is a constant value (excluding ripple voltage) relative to a reference voltage. In this embodiment, AC power is supplied to the inverter 10 from a commercial power supply. The inverter 10 converts this AC power composed of AC voltage into DC power containing a DC voltage. The inverter 10 has a pair of output units 10A and 10B, and outputs the converted DC power to a converter 20 (described later) via the pair of output units 10A and 10B.

[0022] The inverter 10 has a first leg 11 and a second leg 12. The first leg 11 and the second leg 12 are provided in parallel with each other 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.

[0023] The first leg 11 has a high-side switching element 11H and a low-side switching element 11L connected in series. In this embodiment, the switching elements 11H and 11L are formed by n-type metal-oxide-semiconductor field-effect transistors (MOS-FETs). The drain terminal of the switching element 11H is connected to the 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 the 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, and have anode terminals connected to the source terminals and cathode terminals connected to the drain terminals.

[0024] The second leg 12 also 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 used for the switching elements 12H and 12L. The drain terminal of the switching element 12H is connected to the 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 the end 12B. The gate terminals of the switching elements 12H and 12L are connected to the control unit 50. Diodes 12HD and 12LD are provided between the source terminals and drain terminals of the switching elements 12H and 12L, respectively, with the anode terminals connected to the source terminals and the cathode terminals connected to the drain terminals.

[0025] A capacitor 15 is provided across the output part 10A and the output part 10B of the inverter 10. The capacitor 15 smoothes the DC voltage converted by the inverter 10.

[0026] One terminal 30B of the reactor coil 30 is connected to a first node 11N between 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 a line (for example, a wiring pattern on a circuit board or a cable such as a harness) connecting the source terminal of the switching element 11H and the drain terminal of the switching element 11L. Of course, it may be the source terminal of the switching element 11H or the drain terminal of the switching element 11L. The reactor coil 30 has two terminals 30A and 30B, and the terminal 30B is connected to the first node 11N.

[0027] AC power is supplied between the other terminal 30A of the reactor coil 30 and a 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 line (e.g., a wiring pattern on a circuit board or a cable such as a harness) connecting the source terminal of the switching element 12H and the drain terminal of the switching element 12L. Of course, it may also be the source terminal of the switching element 12H or the drain terminal of the switching element 12L. The 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 inverter 10 converts AC power into DC power using the switching elements 11H and 11L in the first leg 11 and the switching elements 12H and 12L in the second leg 12.

[0028] Converter 20 converts the DC power from inverter 10 into DC power composed of a DC voltage of a first voltage value that can charge battery 3. The DC power from inverter 10 is DC power output from output units 10A and 10B of inverter 10. Battery 3 is a battery mounted on a vehicle that is charged by power supply device 1, and is charged based on the DC power output from converter 20. Battery 3 is charged with a DC voltage of a predetermined voltage value, but the voltage value of the DC voltage that constitutes the DC power output from inverter 10 is approximately the voltage value (200 V) of the AC voltage input to inverter 10. Converter 20 boosts the voltage value of the DC voltage output from inverter 10 to a DC voltage of a voltage value (equivalent to the "first voltage value," e.g., several hundred V) required to charge battery 3.

[0029] The converter 20 of this embodiment has an input unit 21, a first conversion unit 22, a second conversion unit 23, and a multi-port transformer (hereinafter referred to as "transformer") 24. In this embodiment, the transformer 24 is configured as an isolated type having a primary winding 24A, a secondary winding 24B, and a tertiary winding 24C.

[0030] The input unit 21 oscillates the DC power from the inverter 10 at a predetermined period and inputs it to the primary winding 24A. The input unit 21 has a third leg 211 and a fourth leg 212, which are provided in parallel with 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.

[0031] The third leg 211 has a high-side switching element S1 (hereinafter referred to as "switching element S1") and a low-side switching element S2 (hereinafter referred to as "switching element S2") connected in series. The switching elements S1 and S2 are formed by n-type MOS-FETs. The drain terminal of the switching element S1 is connected to the end 211A, and the source terminal is connected to the drain terminal of the switching element S2. The source terminal of the switching element S2 is connected to the end 211B. The gate terminals of the switching elements S1 and S2 are connected to the control unit 50. In addition, diodes S1D ​​and S2D are provided between the source terminals and drain terminals of the switching elements S1 and S2, respectively, with the anode terminals connected to the source terminals and the cathode terminals connected to the drain terminals.

[0032] The fourth leg 212 has a high-side switching element S3 (hereinafter referred to as "switching element S3") and a low-side switching element S4 (hereinafter referred to as "switching element S4") connected in series. The switching elements S3 and S4 are formed using n-type MOS-FETs. The drain terminal of the switching element S3 is connected to the end 212A, and the source terminal is connected to the drain terminal of the switching element S4. The source terminal of the switching element S4 is connected to the end 212B. The gate terminals of the switching elements S3 and S4 are connected to the control unit 50. In addition, diodes S3D and S4D are provided between the source terminals and drain terminals of the switching elements S3 and S4, respectively, with the anode terminals connected to the source terminals and the cathode terminals connected to the drain terminals.

[0033] The primary winding 24A is provided across a third node 211N between two switching elements (switching element S1 and switching element S2) in the third leg 211 and a fourth node 212N between two switching elements (switching element S3 and switching element S4) in the fourth leg 212. In this embodiment, the winding start end of the primary winding 24A is connected to the third node 211N, and the winding end end of the primary winding 24A is connected to the fourth node 212N.

[0034] A current (alternating current) according to the turn ratio between the primary winding 24A and the secondary winding 24B flows through the secondary winding 24B, and a voltage (alternating voltage) according to the turn ratio between the primary winding 24A and the secondary winding 24B is generated. The first conversion unit 22 converts the AC power generated in the secondary winding 24B into DC power consisting of a DC voltage of a first voltage value. The first conversion unit 22 has a fifth leg 221 and a sixth leg 222, and the fifth leg 221 and the sixth leg 222 are provided in parallel with each other with respect to terminals 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 terminal 20A, and the other end 221B of the fifth leg 221 and one end 222B of the sixth leg 222 are connected to the terminal 20B.

[0035] The fifth leg 221 has a high-side switching element S5 (hereinafter referred to as "switching element S5") and a low-side switching element S6 (hereinafter referred to as "switching element S6") connected in series. The switching elements S5 and S6 are formed using n-type MOS-FETs. The drain terminal of the switching element S5 is connected to the end 221A, and the source terminal is connected to the drain terminal of the switching element S6. The source terminal of the switching element S6 is connected to the end 221B. The gate terminals of the switching elements S5 and S6 are connected to the control unit 50. In addition, diodes S5D and S6D are provided between the source terminals and drain terminals of the switching elements S5 and S6, respectively, with the anode terminals connected to the source terminals and the cathode terminals connected to the drain terminals.

[0036] The sixth leg 222 has a high-side switching element S7 (hereinafter referred to as "switching element S7") and a low-side switching element S8 (hereinafter referred to as "switching element S8") connected in series. The switching elements S7 and S8 are formed using n-type MOS-FETs. The drain terminal of the switching element S7 is connected to the end 222A, and the source terminal is connected to the drain terminal of the switching element S8. The source terminal of the switching element S8 is connected to the end 222B. The gate terminals of the switching elements S7 and S8 are connected to the control unit 50. In addition, diodes S7D and S8D are provided between the source terminals and drain terminals of the switching elements S7 and S8, respectively, with the anode terminals connected to the source terminals and the cathode terminals connected to the drain terminals.

[0037] The secondary winding 24B described above is provided across a fifth node 221N between two switching elements (switching element S5 and switching element S6) in the fifth leg 221 and a sixth node 222N between two switching elements (switching element S7 and switching element S8) in the sixth leg 222. In this embodiment, the winding start end of the secondary winding 24B is connected to the fifth node 221N via a reactor L, and the winding end end of the secondary winding 24B is connected to the sixth node 222N.

[0038] A first capacitor 25 is provided across terminals 20A and 20B of converter 20. First capacitor 25 smoothes the DC voltage that constitutes the AC power converted by first conversion unit 22.

[0039] A current (alternating current) according to the turn ratio between the primary winding 24A and the tertiary winding 24C flows through the tertiary winding 24C, and a voltage (alternating voltage) according to the turn ratio between the primary winding 24A and the tertiary winding 24C is generated in the tertiary winding 24C. The second conversion unit 23 converts the AC power generated in the tertiary winding 24C into DC power consisting of a DC voltage of a second voltage value (e.g., 12 V) lower than the first voltage value.

[0040] In this embodiment, the tertiary winding 24C includes a first tertiary winding 24CA and a second tertiary winding 24CB. The first tertiary winding 24CA and the second tertiary winding 24CB are provided such that the winding start end of the first tertiary winding 24CA is connected to the winding end end of the second tertiary winding 24CB. A switching element S9 is provided with a drain terminal connected to the winding start end of the first tertiary winding 24CA, and a switching element S10 is provided with a drain terminal connected to the winding end end of the second tertiary winding 24CB. The source terminals of the switching elements S9 and S10 are connected to the terminal 20D. The gate terminals of the switching elements S9 and S10 are connected to the control unit 50. Between the source terminal and drain terminal of each of the switching elements S9 and S10, diodes S9D and S10D are provided, each having an anode terminal connected to the source terminal and a cathode terminal connected to the drain terminal.

[0041] The winding end of the first tertiary winding 24CA and the winding start of the second tertiary winding 24CB are connected to one terminal of the third reactor coil 23L. The other terminal of the third reactor coil 23L is connected to the terminal 20C. The second conversion unit 23 is also provided with a diode 23D1 and a diode 23D2. The anode terminal of the diode 23D1 is connected to the winding start of the first tertiary winding 24CA, and the anode terminal of the diode 23D2 is connected to the winding end of the second tertiary winding 24CB. The cathode terminals of the diodes 23D1 and 23D2 are connected to each other and to the terminal 20C via a resistor R. The cathode terminals of the diodes 23D1 and 23D2 are also connected to the terminal 20D via a capacitor 27. Therefore, the resistor R and the capacitor 27 form a snubber circuit. Furthermore, a second capacitor 26 is provided across terminal 20C and terminal 20D. The second conversion unit 23 converts the AC power generated in the tertiary winding 24C into DC power composed of a DC voltage of a second voltage value through synchronous rectification using switching elements S9 and S10.

[0042] The control unit 50 drives each of the multiple switching elements provided in the inverter 10. Specifically, the control unit 50 alternately switches between the open / closed state of the switching elements 11H and 12L and the open / closed state of the switching elements 11L and 12H. That is, the control unit 50 alternately drives the switching elements 11H and 11L in the first leg 11, and alternately drives the switching elements 12H and 12L at the grid frequency in the second leg 12. This allows the inverter 10 to convert the AC power supplied from the supply unit 2 into DC power based on the driving of the switching elements included in the first leg 11 and the second leg 12, as described above.

[0043] The control unit 50 also drives each of the multiple switching elements provided in the converter 20. FIG. 2 shows a timing chart for charging the battery 3. The control unit 50 drives the switching elements S1-S10 in accordance with the timing chart shown in FIG. 2. In this embodiment, the control unit 50 drives the switching elements S1-S10 while sequentially switching them between eight states, from state 1 to state 8. In the example of FIG. 2, the period from t1 to t9 corresponds to one cycle of control by the control unit 50.

[0044] The first state is the state between t1 and t2 in Figure 2, and in this first state, the control unit 50 closes the switching elements S1, S3, S6, S7, S9, and S10 and opens the switching elements S2, S4, S5, and S8.

[0045] The second state is the state between t2 and t3 in Figure 2, and in this second state, the control unit 50 closes the switching elements S1, S3, S5, S7, S9, and S10 and opens the switching elements S2, S4, S6, and S8.

[0046] The third state is the state between t3 and t4 in Figure 2, and in this third state, the control unit 50 closes the switching elements S1, S4, S5, S7, and S10 and opens the switching elements S2, S3, S6, S8, and S9.

[0047] The fourth state is the state between t4 and t5 in Figure 2, and in this fourth state, the control unit 50 closes the switching elements S1, S4, S5, S8, and S10 and opens the switching elements S2, S3, S6, S7, and S9.

[0048] The fifth state is the state between t5 and t6 in Figure 2, and in this fifth state, the control unit 50 closes switching elements S2, S4, S5, S8, S9, and S10 and opens switching elements S1, S3, S6, and S7.

[0049] The sixth state is the state between t6 and t7 in Figure 2, and in this sixth state, the control unit 50 closes the switching elements S2, S4, S6, S8, S9, and S10 and opens the switching elements S1, S3, S5, and S7.

[0050] The seventh state is the state between t7 and t8 in Figure 2, and in this seventh state, the control unit 50 closes the switching elements S2, S3, S6, S8, and S9 and opens the switching elements S1, S4, S5, S7, and S10.

[0051] The eighth state is the state between t8 and t9 in Figure 2, and in this eighth state, the control unit 50 closes the switching elements S2, S3, S6, S7, and S9 and opens the switching elements S1, S4, S5, S8, and S10.

[0052] For ease of understanding, it is assumed that the period during which each of the switches S1 to S8 is in a closed state in one cycle is equal to the period during which each of the switches S1 to S8 is in an open state.

[0053] 2, the switching element S1 of the third leg 211 and the switching element S4 of the fourth leg 212 are shifted by a preset first shift amount θ1 when they are closed. That is, in the example of FIG. 2, the switching element S1 of the third leg 211 is closed at t1, and then the first shift amount θ1 elapses, and then the switching element S4 of the fourth leg 212 is closed at t3. Therefore, the switching element S1 of the third leg 211 and the switching element S4 of the fourth leg 212 are shifted by the first shift amount θ1 when they are opened. That is, the switching element S1 of the third leg 211 is opened at t5, and then the switching element S4 of the fourth leg 212 is opened at t7, and then the first shift amount θ1 elapses.

[0054] 2, the switching element S2 of the third leg 211 and the switching element S3 of the fourth leg 212 are switched to the closed state with a shift of the first shift amount θ1. That is, in the example of FIG. 2, the switching element S2 of the third leg 211 is switched to the closed state at t5, and then the first shift amount θ1 has elapsed, and then the switching element S3 of the fourth leg 212 is switched to the closed state at t7. Therefore, the switching element S2 of the third leg 211 and the switching element S3 of the fourth leg 212 are switched to the open state with a shift of the first shift amount θ1. That is, the switching element S2 of the third leg 211 is switched to the open state at t9, and then the first shift amount θ1 has elapsed, and then the switching element S3 of the fourth leg 212 is switched to the open state at t11.

[0055] Furthermore, the switching element S5 of the fifth leg 221 and the switching element S8 of the sixth leg 222 are shifted to the closed state by the first shift amount θ1. That is, in the example of FIG. 2 , the switching element S5 of the fifth leg 221 is closed at t2, and then the first shift amount θ1 has elapsed, and then the switching element S8 of the sixth leg 222 is closed at t4. Therefore, the switching element S5 of the fifth leg 221 and the switching element S8 of the sixth leg 222 are shifted to the open state by the first shift amount θ1. That is, the switching element S5 of the fifth leg 221 is opened at t6, and then the first shift amount θ1 has elapsed, and then the switching element S8 of the sixth leg 222 is opened at t8.

[0056] Furthermore, the switching element S6 of the fifth leg 221 and the switching element S7 of the sixth leg 222 are shifted by the first shift amount θ1 to be in the closed state. That is, in the example of FIG. 2, the switching element S6 of the fifth leg 221 is shifted to the closed state at t6, and then the first shift amount θ1 has elapsed, and at t8 the switching element S7 of the sixth leg 222 is shifted to the closed state. Therefore, the switching element S6 of the fifth leg 221 and the switching element S7 of the sixth leg 222 are shifted by the first shift amount θ1 to be in the open state. That is, in the example of FIG. 2, the switching element S6 of the fifth leg 221 is shifted to the open state at t10, and then the first shift amount θ1 has elapsed, and at t12 the switching element S7 of the sixth leg 222 is shifted to the open state.

[0057] Furthermore, when the battery 3 is being charged, the switching element S5 of the fifth leg 221 is closed a second shift amount θ2 after the switching element S1 of the third leg 211 is closed. The second shift amount θ2 is smaller than the first shift amount θ1.

[0058] For example, the second shift amount θ2 can be set based on a power command value for the DC power output from the first conversion unit 22 and the calculated power value for the DC power output from the first conversion unit 22. The power command value for the DC power output from the first conversion unit 22 is a command value requested from a higher-level system to the power supply device 1 (more specifically, the control unit 50) as the DC power to be output from the power supply device 1. The control unit 50 sets a first voltage value for the DC voltage constituting the DC power output from the first conversion unit 22 based on the power command value, and sets a current value for the DC current to be output from the first conversion unit 22. The second shift amount θ2 is set based on a pre-stored arithmetic expression so as to realize this current value. This arithmetic expression is shown as the following equation (1).

[0059]

number

[0060] On the other hand, the calculated power value of the DC power output from the first conversion unit 22 is a calculated value calculated by multiplying the voltage value (preferably the first voltage value) of the DC voltage (output voltage) output from the first conversion unit 22 by the current value of the DC current (consumption current) output from the first conversion unit 22.

[0061] The voltage value (preferably the first voltage value) of the DC voltage (output voltage) output from first conversion unit 22 is measured by a voltage sensor (e.g., a voltmeter) not shown, and the current value of the DC current (consumption current) output from first conversion unit 22 is measured by a current sensor (e.g., an ammeter) not shown. Based on these two detection results, control unit 50 can calculate the estimated power value. Control unit 50 controls converter 20 by feedback control so that the estimated power value is equal to the power command value.

[0062] 2, the second shift amount θ2 is set to half the first shift amount θ1. Therefore, as shown in FIG. 2, the switching element S5 of the fifth leg 221 is closed at t2, which is the second shift amount θ2 after t1, at which the switching element S1 of the third leg 211 is closed. Furthermore, when the battery 3 is being charged, the switching element S5 of the fifth leg 221 is opened at t6, which is the second shift amount θ2 after t5, at which the switching element S1 of the third leg 211 is opened. That is, when the battery 3 is being charged, as shown in FIG. 2, the switching element S5 of the fifth leg 221 is opened at t6, which is the second shift amount θ2 after t5, at which the switching element S1 of the third leg 211 is opened.

[0063] Furthermore, when the battery 3 is being charged, the switching element S7 of the sixth leg 222 is closed the second shift amount θ2 after the switching element S3 of the fourth leg 212 is closed. That is, as shown in FIG. 2, the switching element S7 of the sixth leg 222 is closed at t8, which is the second shift amount θ2 after t7, when the switching element S3 of the fourth leg 212 is closed. Also, when the battery 3 is being charged, the switching element S7 of the sixth leg 222 is opened the second shift amount θ2 after t3, when the switching element S3 of the fourth leg 212 is opened. That is, when the battery 3 is being charged, the switching element S7 of the sixth leg 222 is opened the second shift amount θ2 after t4, when the switching element S3 of the fourth leg 212 is opened.

[0064] As described above, the second conversion unit 23 is driven by synchronous rectification. In this embodiment, as shown in Fig. 2, switching element S9 is opened from t3 to t5, and switching element S10 is opened from t7 to t9. As a result, as shown in Fig. 2, a current having a waveform indicated by I9 flows through switching element S9, and a current having a waveform indicated by I10 flows through switching element S10.

[0065] As described above, switching element S9 is open from t3 to t5, and switching element S10 is open from t7 to t9. The second voltage value of the DC voltage output from second conversion unit 23 can be changed depending on the period during which switching element S9 is open and the period during which switching element S10 is open. The period during which switching element S9 is open and the period during which switching element S10 is open correspond to (carrier period / 2) - first shift amount θ1. Therefore, in this embodiment, the DC voltage of the second voltage value can be controlled based on the first shift amount θ1.

[0066] Here, the second conversion unit 23 can also generate DC power consisting of a DC voltage of a second voltage value based on the electrical energy stored in the battery 3. In this case, the supply of DC power from the supply unit 2 is stopped, and the DC power of the battery 3 is transmitted from the secondary winding 24B to the primary winding 24A of the transformer 24, and from the primary winding 24A to the tertiary winding 24C. FIG. 3 shows a timing chart of how the control unit 50 drives each of the multiple switching elements provided in the converter 20 when DC power is output from the second conversion unit 23 based on the DC power from the battery 3. In this case, the control unit 50 also drives the switching elements S1-S10 by sequentially switching them between eight states, from the first state to the eighth state.

[0067] The first state in which DC power is output from the second conversion unit 23 based on DC power from the battery 3 is the state between t1 and t2 in Figure 3, and in this first state, the control unit 50 closes the switching elements S1, S3, S5, S7, S9, and S10 and opens the switching elements S2, S4, S6, and S8.

[0068] The second state is the state between t2 and t3 in Figure 3, and in this second state, the control unit 50 closes the switching elements S1, S3, S5, S8, S9, and S10 and opens the switching elements S2, S4, S6, and S7.

[0069] The third state is the state between t3 and t4 in Figure 3, and in this third state, the control unit 50 closes the switching elements S1, S4, S5, S8, and S10 and opens the switching elements S2, S3, S6, S7, and S9.

[0070] The fourth state is the state between t4 and t5 in Figure 2, and in this fourth state, the control unit 50 closes the switching elements S1, S4, S6, S8, and S10 and opens the switching elements S2, S3, S5, S7, and S9.

[0071] The fifth state is the state between t5 and t6 in Figure 2, and in this fifth state, the control unit 50 closes the switching elements S2, S4, S6, S8, S9, and S10 and opens the switching elements S1, S3, S5, and S7.

[0072] The sixth state is the state between t6 and t7 in Figure 2, and in this sixth state, the control unit 50 closes switching elements S2, S4, S6, S7, S9, and S10 and opens switching elements S1, S3, S5, and S8.

[0073] The seventh state is the state between t7 and t8 in Figure 2, and in this seventh state, the control unit 50 closes the switching elements S2, S3, S6, S7, and S9 and opens the switching elements S1, S4, S5, S8, and S10.

[0074] The eighth state is the state between t8 and t9 in Figure 2, and in this eighth state, the control unit 50 closes the switching elements S2, S3, S5, S7, and S9 and opens the switching elements S1, S4, S6, S8, and S10.

[0075] For ease of understanding, it is assumed that the period during which each of the switches S1 to S8 is in a closed state in one cycle is equal to the period during which each of the switches S1 to S8 is in an open state.

[0076] The switching elements S1, S2, S3, and S4 are driven in the same manner as when charging the battery 3. That is, as shown in Fig. 3, the switching element S1 of the third leg 211 and the switching element S4 of the fourth leg 212 are shifted by a preset first shift amount θ1 and brought to a closed state, and the switching element S1 of the third leg 211 and the switching element S4 of the fourth leg 212 are shifted by the first shift amount θ1 and brought to an open state.

[0077] In addition, the switching element S2 of the third leg 211 and the switching element S3 of the fourth leg 212 are shifted by the first shift amount θ1 and put into a closed state, and the switching element S2 of the third leg 211 and the switching element S3 of the fourth leg 212 are shifted by the first shift amount θ1 and put into an open state.

[0078] In addition, the switching element S5 of the fifth leg 221 and the switching element S8 of the sixth leg 222 are shifted by the first shift amount θ1 and put into a closed state, and the switching element S5 of the fifth leg 221 and the switching element S8 of the sixth leg 222 are shifted by the first shift amount θ1 and put into an open state.

[0079] Furthermore, the switching element S6 of the fifth leg 221 and the switching element S7 of the sixth leg 222 are shifted by the first shift amount θ1 and put into a closed state, and the switching element S6 of the fifth leg 221 and the switching element S7 of the sixth leg 222 are shifted by the first shift amount θ1 and put into an open state.

[0080] Furthermore, when generating DC power configured as a DC voltage of the second voltage value based on the electrical energy stored in the battery 3, the switching element S5 of the fifth leg 221 is closed at a time t8 that is the second shift amount θ2 before the switching element S1 of the third leg 211 is closed. That is, as shown in FIG. 3 , the switching element S5 of the fifth leg 221 is closed at t8, which is the second shift amount θ2 before t9, at which the switching element S1 of the third leg 211 is closed. Also, the switching element S5 of the fifth leg 221 is opened at a time t2 that is the second shift amount θ2 before t5, at which the switching element S1 of the third leg 211 is opened. That is, as shown in FIG. 3 , the switching element S5 of the fifth leg 221 is opened at t4, which is the second shift amount θ2 before t5, at which the switching element S1 of the third leg 211 is opened.

[0081] Furthermore, the switching element S7 of the sixth leg 222 is closed at a time that is the second shift amount θ2 before the switching element S3 of the fourth leg 212 is closed. That is, as shown in FIG. 3, the switching element S7 of the sixth leg 222 is closed at t6, which is the second shift amount θ2 before t7, when the switching element S3 of the fourth leg 212 is closed. Also, the switching element S7 of the sixth leg 222 is opened at a time that is the second shift amount θ2 before t9, when the switching element S3 of the fourth leg 212 is opened. That is, as shown in FIG. 3, the switching element S7 of the sixth leg 222 is opened at t10, which is the second shift amount θ2 before t9, when the switching element S3 of the fourth leg 212 is opened.

[0082] 3, switching element S9 is opened from t3 to t5, and switching element S10 is opened from t7 to t9. As a result, when DC power constituted by a DC voltage of the second voltage value is generated based on the electrical energy stored in battery 3, a current having a waveform as indicated by I9 flows through switching element S9, and a current having a waveform as indicated by I10 flows through switching element S10, as in the case of charging battery 3, as shown in FIG.

[0083] With the above configuration, when the power supply device 1 charges the battery 3 with AC power, it is possible to output a DC voltage consisting of a DC voltage of a first voltage value capable of charging the battery 3, and a DC voltage consisting of a DC voltage value of a second voltage value. Furthermore, it is possible to output a DC voltage consisting of a DC voltage value of the second voltage value using DC power from the battery 3.

[0084] Other Embodiments In the above embodiment, the switching elements of the inverter 10 and the converter 20 are described as n-type MOS-FETs, but the switching elements may be p-type MOS-FETs or may be switching elements other than FETs (for example, IGBTs or bipolar transistors).

[0085] In the above embodiment, the inverter 10 and the converter 20 are described as converting AC power into DC power using switching elements, but the inverter 10 may be configured to convert AC power into DC power using diodes.

[0086] In the above embodiment, the control unit 50 drives the switching element in the first to eighth states, and each state is described. However, it is also possible to drive the switching element based on more than eight states, or seven or fewer states. Furthermore, the states of the switching element in each state are merely examples, and it is also possible to drive the switching element in a manner different from that of the above embodiment.

[0087] In the above embodiment, the AC power supplied to the inverter 10 is described as being AC power from a commercial power supply, but the AC power supplied to the inverter 10 may be AC ​​power different from the AC power of the commercial power supply.

[0088] In the above embodiment, the tertiary winding 24C of the transformer 24 is described as being composed of a first tertiary winding 24CA and a second tertiary winding 24CB, but the tertiary winding 24C may be one winding or three or more windings.

[0089] In the above embodiment, it has been explained that the average value of the combined current of the current flowing through the first tertiary winding 24CA and the current flowing through the second tertiary winding 24CB is zero. However, the average value of the combined current of the current flowing through the first tertiary winding 24CA and the current flowing through the second tertiary winding 24CB does not have to be zero, and may be, for example, a current in which the current flowing through the first tertiary winding 24CA and the current flowing through the second tertiary winding 24CB are superimposed on a predetermined DC current.

[0090] In the above embodiment, the DC voltage of the second voltage value is described as being controlled based on the first shift amount θ1, but the DC voltage of the second voltage value may be controlled by, for example, feedback control.

[0091] In the above embodiment, the second shift amount θ2 has been described as being set based on the power command value of the DC power output from the first conversion unit 22 and the calculated power value of the DC power output from the first conversion unit 22. However, the second shift amount θ2 may be configured to be set in advance, or may be configured to be changed as appropriate depending on the type of load on the converter 20, for example.

[0092] The present invention can be used in a power supply device. [Explanation of symbols]

[0093] 1: Power supply 3: Battery 11: First leg 11H: Switching element 11L: Switching element 12: Second leg 12H: Switching element 12L: Switching element 20: Converter 21: Input section 22: First conversion unit 23: Second conversion unit 24: Transformer (multi-port transformer) 24A: Primary winding 24B: Secondary winding 24C: Tertiary winding 24CA: 1st tertiary winding 24CB: Second tertiary winding 211: Third Leg 212: 4th Leg 221: 5th Leg 222: 6th Leg S1: Switching element S2: Switching element S3: Switching element S4: Switching element S5: Switching element S6: Switching element S7: Switching element S8: Switching element S9: Switching element S10: Switching element

Claims

1. an inverter that converts AC power into DC power, the inverter including a first leg in which a high-side switching element and a low-side switching element are connected in series and a second leg in which a high-side switching element and a low-side switching element are connected in series, the first leg being provided in parallel with the second leg; a converter including an insulating multi-port transformer having a primary winding, a secondary winding, and a tertiary winding, and converting the DC power from the inverter into DC power configured as a DC voltage of a first voltage value for charging a battery; the converter has an input unit that oscillates the DC power from the inverter at a predetermined period and inputs the DC power to the primary winding, a first conversion unit that converts the AC power generated in the secondary winding into DC power composed of a DC voltage of the first voltage value, and a second conversion unit that converts the AC power generated in the tertiary winding into DC power composed of a DC voltage of a second voltage value lower than the first voltage value, The second conversion unit converts the AC power generated in the tertiary winding into DC power constituted by a DC voltage of the second voltage value by synchronous rectification.

2. the input unit includes a third leg in which a high-side switching element and a low-side switching element are connected in series, and a fourth leg in which a high-side switching element and a low-side switching element are connected in series, the fourth leg being provided in parallel with each other; the first conversion unit includes a fifth leg in which a high-side switching element and a low-side switching element are connected in series, and a sixth leg in which a high-side switching element and a low-side switching element are connected in series, which are provided in parallel with each other; the high-side switching element of the third leg and the low-side switching element of the fourth leg are shifted by a preset first shift amount and are put into a closed state; the low-side switching element of the third leg and the high-side switching element of the fourth leg are shifted by the first shift amount and brought into a closed state; the high-side switching element of the fifth leg and the low-side switching element of the sixth leg are shifted by the first shift amount and brought into a closed state; the low-side switching element of the fifth leg and the high-side switching element of the sixth leg are shifted by the first shift amount and brought into a closed state; 2. The power supply device according to claim 1, wherein, during charging of the battery, the high-side switching element of the fifth leg is closed a second shift amount smaller than the first shift amount after the high-side switching element of the third leg is closed, and the high-side switching element of the sixth leg is closed a second shift amount after the high-side switching element of the fourth leg is closed.

3. the input unit includes a third leg in which a high-side switching element and a low-side switching element are connected in series, and a fourth leg in which a high-side switching element and a low-side switching element are connected in series, the fourth leg being provided in parallel with each other; the first conversion unit includes a fifth leg in which a high-side switching element and a low-side switching element are connected in series, and a sixth leg in which a high-side switching element and a low-side switching element are connected in series, which are provided in parallel with each other; the high-side switching element of the third leg and the low-side switching element of the fourth leg are shifted by a preset first shift amount and are put into a closed state; the low-side switching element of the third leg and the high-side switching element of the fourth leg are shifted by the first shift amount and brought into a closed state; the high-side switching element of the fifth leg and the low-side switching element of the sixth leg are shifted by the first shift amount and brought into a closed state; the low-side switching element of the fifth leg and the high-side switching element of the sixth leg are shifted by the first shift amount and brought into a closed state; 2. The power supply device according to claim 1, wherein, when the second conversion unit generates DC power configured with a DC voltage of the second voltage value based on the electrical energy charged in the battery, the high-side switching element of the fifth leg is closed a second shift amount smaller than the first shift amount after the high-side switching element of the third leg is closed, and the high-side switching element of the sixth leg is closed a second shift amount before the high-side switching element of the fourth leg is closed.

4. the tertiary winding is composed of a first tertiary winding and a second tertiary winding, 3. The power supply device according to claim 1, wherein an average value of a combined current of the current flowing through said first tertiary winding and the current flowing through said second tertiary winding can be set to zero.

5. 4. The power supply device according to claim 2, wherein the DC voltage of the second voltage value is controlled based on the first shift amount.

6. 4. The power supply device according to claim 2, wherein the second shift amount is set based on a power command value of the DC power output from the first conversion unit and a power calculation value of the DC power output from the first conversion unit.

7. If the potential across the primary winding is V1, the potential across the secondary winding and the reactor is V2', the output power is P, the second shift amount is θ2, the switching frequency of the switching element is ω, and the inductance value of the reactor is L, then: The second shift amount is [Equation 1] The power supply device according to claim 2 or 3, wherein the setting is based on the following:

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