Charger, program, control method

Abstract

To provide a charger capable of reducing voltage resistance of a smoothing capacitor, and a program.SOLUTION: A charger 10 which is adaptable to a three-phase AC power source or a single-phase AC power source comprises: AC terminals Tac1 to Tac3; DC terminals TdcH and TdcL; a power factor improvement circuit 20 by which an inputted AC voltage is converted into a DC voltage and output; a step-down chopper circuit 40 by which the DC voltage inputted from the power factor improvement circuit 20 is stepped down and output; a DC-DC converter 50; and a smoothing capacitor 55. The smoothing capacitor 55 is connected to an input side of the DC-DC converter 50. The DC-DC converter 50 connects an output side of the step-down chopper circuit 40 with the DC terminals TdcH and TdcL, transforms a DC voltage inputted from the step-down chopper circuit 40 and outputs the transformed voltage to the DC terminals TdcH and TdcL.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a charger 、 program and control method .

Background Art

[0002] Conventionally, chargers compatible with both three-phase AC power supplies and single-phase AC power supplies have been known. As an example of such a charger, a power conversion device disclosed in Patent Document 1 can be mentioned.

[0003] The charger includes an AC-DC converter. The AC-DC converter includes upper and lower arm switches provided corresponding to each phase. The high-potential side terminals of the upper arm switches of each phase are connected to the high-potential side DC terminal, and the low-potential side terminals of the lower arm switches of each phase are connected to the low-potential side DC terminal. The high-potential side path and the low-potential side path are connected by a smoothing capacitor.

[0004] The charger includes an inductor provided corresponding to each phase, and a compensation capacitor and a switching switch provided corresponding to any one phase of each phase. By operating the switching switch, the compensation capacitor is connected in parallel with a series connection of an inductor for one phase and a lower arm switch, or disconnected from this series connection.

[0005] During single-phase charging control in which a single-phase AC power supply is electrically connected to the AC terminal on the input side, the switching switch is operated so that the compensation capacitor is connected in parallel with a series connection of an inductor and a lower arm switch. In this operating state, switching control of the upper and lower arm switches of the phase to which the compensation capacitor is connected is performed. Thereby, when converting AC power input from the AC terminal into DC power and outputting it from the DC terminal, the pulsation of the terminal voltage of the smoothing capacitor can be reduced.

Prior Art Documents

Patent Documents

[0006] [Patent Document 1] U.S. Specification No. 8503208 [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] In three-phase charging control, where a three-phase AC power supply is electrically connected to the AC terminals, the output voltage of the AC / DC converter is higher than in single-phase charging control. Therefore, although the pulsation of the terminal voltage of the smoothing capacitor can be reduced in single-phase charging control, the voltage rating of the smoothing capacitor must be set considering the output voltage of the AC / DC converter in three-phase charging control. As a result, it may not be possible to reduce the voltage rating of the smoothing capacitor, which can lead to problems such as an increase in the size of the smoothing capacitor.

[0008] This disclosure relates to a charger that can reduce the voltage withstand capability of a smoothing capacitor. 、 program and control method The primary purpose is to provide [this]. [Means for solving the problem]

[0009] This disclosure relates to a multi-phase AC terminal and DC terminal and Equipped with, In a charger configured so that a multi-phase AC power supply or a single-phase AC power supply can be electrically connected to the AC terminal, An AC / DC converter connected to the aforementioned AC terminal, which converts the AC voltage input from the AC terminal into a DC voltage and outputs it, A step-down chopper circuit connected to the output side of the AC / DC converter, which steps down the DC voltage input from the AC / DC converter and outputs it, DC-DC converter and A smoothing capacitor, It is equipped with.

[0010] In this disclosure, the smoothing capacitor is connected to the input side of the DC-DC converter. The DCDC converter connects the output side of the buck chopper circuit and the DC terminal, transforms the DC voltage input from the buck chopper circuit, and outputs it to the DC terminal.

[0011] Thereby, the applied voltage of the smoothing capacitor connected to the input side of the DCDC converter can be reduced. As a result, the withstand voltage of the smoothing capacitor can be reduced.

Brief Description of the Drawings

[0012] [Figure 1] Overall configuration diagram of the in-vehicle charger according to the first embodiment. [Figure 2] Diagram showing the in-vehicle charger during three-phase charging. [Figure 3] Diagram showing the in-vehicle charger during single-phase charging. [Figure 4] Flowchart showing the procedure for charging control of the storage battery. [Figure 5] Block diagram of the pulsation compensation control process during single-phase charging control. [Figure 6] Time chart showing the transition of current, voltage, etc. during single-phase charging control. [Figure 7] Overall configuration diagram of the in-vehicle charger according to the second embodiment. [Figure 8] Flowchart showing the procedure for charging control of the storage battery. [Figure 9] Diagram showing the in-vehicle charger during three-phase charging according to the third embodiment. [Figure 10] Diagram showing the in-vehicle charger during single-phase charging. [Figure 11] Flowchart showing the procedure for charging control of the storage battery. [Figure 12] Diagram showing the in-vehicle charger during three-phase charging according to the fourth embodiment. [Figure 13] Diagram showing the in-vehicle charger during single-phase charging. [Figure 14] Flowchart showing the procedure for charging control of the storage battery. [Figure 15] Diagram showing the in-vehicle charger during three-phase charging according to the fifth embodiment. [Figure 16] Figure showing an in-vehicle charger during single-phase charging. [Figure 17] Flowchart showing the procedure for charging control of a storage battery. [Figure 18] Figure showing an in-vehicle charger during three-phase charging according to the sixth embodiment. [Figure 19] Figure showing an in-vehicle charger during single-phase charging.

Mode for Carrying Out the Invention

[0013] A plurality of embodiments will be described while referring to the drawings. In the plurality of embodiments, parts that functionally and / or structurally correspond and / or are associated may be assigned the same reference numerals, or reference numerals that differ in the hundreds place or more. For corresponding parts and / or associated parts, the descriptions of other embodiments can be referred to.

[0014] <First Embodiment> Hereinafter, a first embodiment in which a charger according to the present invention is embodied will be described while referring to the drawings. The charger according to this embodiment is provided in a vehicle such as an electric vehicle. The in-vehicle charger is also called an on-board charger.

[0015] The charger includes an AC terminal and a DC terminal. The charger has a function of converting AC power input through the AC terminal connected to an AC power source outside the vehicle into DC power and outputting it from the DC terminal. The DC power output from the DC terminal is supplied to a storage battery provided in the vehicle.

[0016] As shown in FIG. 1, the charger 10 includes a first AC terminal Tac1, a second AC terminal Tac2, and a third AC terminal Tac3 as AC terminals. The first to third AC terminals Tac1 to Tac3 can be connected to a three-phase AC power source 200 outside the vehicle as shown in FIG. 2. Among the first to third AC terminals Tac1 to Tac3, the first and third AC terminals Tac1 and Tac^3 can be connected to a single-phase AC power source 210 outside the vehicle as shown in FIG. 3.

[0017] The charger 10 is equipped with a power factor correction circuit 20. The power factor correction circuit 20 functions as an ACDC converter, comprising a series connection of a first upper arm switch S1H and a first lower arm switch S1L, a series connection of a second upper arm switch S2H and a second lower arm switch S2L, and a series connection of a third upper arm switch S3H and a third lower arm switch S3L, as upper and lower arm switches for three phases. In this embodiment, each upper and lower arm switch S1H to S3L is an N-channel MOSFET with a body diode. Therefore, in each upper and lower arm switch S1H to S3L, the high-potential side terminal is the drain and the low-potential side terminal is the source. Of the first to third phases, for example, the first phase is the U phase, the second phase is the V phase, and the third phase is the W phase.

[0018] The power factor correction circuit 20 includes a high-potential input path 25H connected to the high-potential terminals of the first, second, and third upper arm switches S1H, S2H, and S3H, and a low-potential input path 25L connected to the low-potential terminals of the first, second, and third lower arm switches S1L, S2L, and S3L. Each path 25H and 25L is an electrical path including busbars, etc. The power factor correction circuit 20 includes a first smoothing capacitor 24 connecting the high-potential input path 25H and the low-potential input path 25L.

[0019] The power factor correction circuit 20 includes a first path 21, a second path 22, and a third path 23. The first path 21 is an electrical path corresponding to the first phase, connecting the low-potential terminal of the first upper arm switch S1H and the high-potential terminal of the first lower arm switch S1L to the first AC terminal Tac1. The second path 22 is an electrical path corresponding to the second phase, connecting the low-potential terminal of the second upper arm switch S2H and the high-potential terminal of the second lower arm switch S2L to the second AC terminal Tac2. The third path 23 is an electrical path corresponding to the third phase, connecting the low-potential terminal of the third upper arm switch S3H and the high-potential terminal of the third lower arm switch S3L to the third AC terminal Tac3.

[0020] The power factor correction circuit 20 includes a first inductor 31 provided in the first path 21, a second inductor 32 provided in the second path 22, and a third inductor 33 provided in the third path 23. The inductance values ​​of each inductor 31 to 33 may be the same, and the rated current (specifically, the temperature rise rated current) of each inductor 31 to 33 may also be the same.

[0021] The charger 10 is equipped with a step-down chopper circuit 40. The step-down chopper circuit 40 steps down the DC voltage input from the power factor correction circuit 20 and outputs the stepped-down DC voltage. The step-down chopper circuit 40 is equipped with upper and lower arm transformer switches 41H and 41L, an inductor 42, and a capacitor 43. In this embodiment, the upper and lower arm transformer switches 41H and 41L are N-channel MOSFETs having body diodes. Therefore, in the upper and lower arm transformer switches 41H and 41L, the high-potential side terminal is the drain and the low-potential side terminal is the source.

[0022] The first terminal TP, which constitutes the high-potential input path 25H, is connected to the high-potential terminal of the upper arm transformer switch 41H, and the second terminal TN, which constitutes the low-potential input path 25L, is connected to the low-potential terminal of the lower arm transformer switch 41L. The first end of the inductor 42 is connected to the low-potential terminal of the upper arm transformer switch 41H and the high-potential terminal of the lower arm transformer switch 41L. The first end of the capacitor 43 is connected to the second end of the inductor 42. The low-potential terminal of the lower arm transformer switch 41L is connected to the second end of the capacitor 43. Note that the first terminal TP does not necessarily have to be configured in the high-potential input path 25H, and the second terminal TN does not necessarily have to be configured in the low-potential input path 25L.

[0023] The charger 10 is equipped with a DC-DC converter 50. The DC-DC converter 50 transforms the DC voltage input from the step-down chopper circuit 40 and outputs the transformed DC voltage. The DC-DC converter 50 is a DAB (Dual Active Bridge) type and is an isolated DC-DC converter equipped with a first bridge circuit 51, a second bridge circuit 52, and a transformer 53 that transmits power between each bridge circuit 51, 52.

[0024] The first bridge circuit 51 is a full bridge circuit and includes first to fourth conversion switches Q1 to Q4. The second bridge circuit 52 is a full bridge circuit and includes fifth to eighth conversion switches Q5 to Q8. In this embodiment, each conversion switch Q1 to Q8 is an N-channel MOSFET having a body diode. Therefore, in each conversion switch Q1 to Q8, the high-potential side terminal is the drain and the low-potential side terminal is the source. The DC-DC converter 50 may be of another type (e.g., LLC type).

[0025] The DC-DC converter 50 is equipped with a high-potential path 54H and a low-potential path 54L. Each path 54H and 54L is an electrical path composed of busbars or the like. The high-potential path 54H is connected to the high-potential terminals of the first and third conversion switches Q1 and Q3, and the low-potential path 54L is connected to the low-potential terminals of the second and fourth conversion switches Q2 and Q4. The high-potential path 54H and the low-potential path 54L are connected by a second smoothing capacitor 55 provided in the DC-DC converter 50. The second smoothing capacitor 55 may be provided outside the DC-DC converter 50 instead of being built into the DC-DC converter 50.

[0026] In the first bridge circuit 51, the first terminal of the primary coil 53A constituting the transformer 53 is connected to the connection point of the first and second conversion switches Q1 and Q2. The second terminal of the primary coil 53A is connected to the connection point of the third and fourth conversion switches Q3 and Q4. The first terminal of the primary coil 53A constituting the transformer 53 is connected to the connection point of the first and second conversion switches Q1 and Q2. The second terminal of the primary coil 53A is connected to the connection point of the third and fourth conversion switches Q3 and Q4.

[0027] In the second bridge circuit 52, the first end of the secondary coil 53B constituting the transformer 53 is connected to the connection point of the fifth and sixth conversion switches Q5 and Q6. The second end of the secondary coil 53B is connected to the connection point of the seventh and eighth conversion switches Q7 and Q8. The turns ratio of the secondary coil 53B and the primary coil 53A is, for example, 1. The secondary coil 53B and the primary coil 53A are magnetically coupled via the core 53C constituting the transformer 53.

[0028] The high-potential terminals of the 5th and 7th conversion switches Q5 and Q7 are connected to the high-potential DC terminal TdcH of the charger 10. The low-potential terminals of the 6th and 8th conversion switches Q6 and Q8 are connected to the low-potential DC terminal TdcL of the charger 10. The high-potential terminals of the 5th and 7th conversion switches Q5 and Q7 and the low-potential terminals of the 6th and 8th conversion switches Q6 and Q8 are connected by a third smoothing capacitor 56 of the DC-DC converter 50. A noise-removing filter 60 is provided between the second bridge circuit 52 and each DC terminal TdcH and TdcL.

[0029] The positive terminal of the battery 220 mounted on the vehicle is connected to the high-potential DC terminal TdcH. The battery 220 is a rechargeable secondary battery, such as a lithium-ion battery or a nickel-metal hydride battery. The low-potential DC terminal TdcL is connected to the negative terminal of the battery 220.

[0030] The charger 10 is equipped with first to third current sensors 71 to 73. The first current sensor 71 detects the current flowing through the first inductor 31, the second current sensor 72 detects the current flowing through the second inductor 32, and the third current sensor 73 detects the current flowing through the third inductor 33. In this embodiment, the currents detected by the first, second, and third current sensors 71, 72, and 73 (hereinafter referred to as the first, second, and third current detection values ​​i1r, i2r, and i3r) are considered positive when they flow from the first, second, and third AC terminals Tac1, Tac2, and Tac3 to the first, second, and third inductors 31, 32, and 33.

[0031] The charger 10 is equipped with an AC voltage sensor 81 and a DC voltage sensor 82. The AC voltage sensor 81 detects the voltage difference between the first AC terminal Tac1 and the third AC terminal Tac4. The DC voltage sensor 82 detects the terminal voltage of the capacitor 43.

[0032] The charger 10 is equipped with a current sensor 83 that detects the current flowing through the inductor 42. In this embodiment, the current detected by the current sensor 83 is considered positive when it flows from the inductor 42 toward the connection point side of each transformer switch 41H, 41L. The detected values ​​of each sensor 71-73, 81-83 are input to the control device 100 provided in the charger 10.

[0033] The control device 100 is an electronic control unit (ECCU) mainly composed of a microcontroller 100a. The control device 100 is capable of exchanging information with a higher-level control device 101, which is more advanced than the control device 100. The higher-level control device 101 is an electronic control unit (ECCU) mainly composed of a microcontroller 101a and is located outside the charger 10.

[0034] Each microcontroller 100a, 101a is equipped with a CPU (Central Processing Unit). The functions provided by each microcontroller 100a, 101a can be provided by software recorded in a physical memory device and the computer that executes it, by software only, by hardware only, or by a combination thereof. For example, if the microcontroller is provided by electronic circuits which are hardware, it can be provided by digital circuits including a large number of logic circuits, or by analog circuits. For example, the microcontroller executes a program stored in a non-transitory tangible storage medium which serves as its own memory. The program includes, for example, a program for charge control processing as shown in Figure 4, which will be described later. The method corresponding to the program is executed when a set of instructions constituting the program is executed. The memory is, for example, non-volatile memory. The program stored in the memory can be updated via a communication network such as the Internet, for example, OTA (Over The Air).

[0035] In the vehicle, the charger 10 is equipped with a first cutoff switch 90A, a second cutoff switch 90B, and a third cutoff switch 90C. In this embodiment, each of the cutoff switches 90A to 90C is a relay. Each of the cutoff switches 90A to 90C allows bidirectional current flow when turned ON and prevents bidirectional current flow when turned OFF. The first to third cutoff switches 90A to 90C are connected to the first to third AC terminals Tac3 to Tac3.

[0036] As shown in Figure 2, a three-phase AC power supply 200 can be electrically connected to the first to third AC terminals Tac1 to Tac3 via the first to third circuit breaker switches 90A to 90C. The three-phase AC power supply 200 is, for example, a grid power supply. In the three-phase AC power supply 200, the amplitude and frequency of the three phase output voltages V1, V2, and V3 are the same, and the phase of the output voltage and output current is shifted by 120° in each phase.

[0037] As shown in Figure 3, a single-phase AC power supply 210 can be electrically connected to the first AC terminal Tac1 and the third AC terminal Tac3 via the first and third cutoff switches 90A and 90C. In this embodiment, the amplitude of the output voltage Vac of the single-phase AC power supply 210 is the same as the amplitude of the output voltages V1 to V3 of the three-phase AC power supply 200. Also, the frequency of the output voltage Vac of the single-phase AC power supply 210 is the same as the frequency of the output voltages V1 to V3 of the three-phase AC power supply 200.

[0038] The charger 10 is equipped with a changeover switch 45 for switching the connection state between the output side of the step-down chopper circuit 40 and the input side of the DC-DC converter 50. When the changeover switch 45 is controlled to the first state, the connection point of the inductor 42 and capacitor 43 is connected to the high-potential side path 54H, as shown in Figure 2. On the other hand, when the changeover switch 45 is controlled to the second state, the high-potential side terminal and the first terminal TP of the upper arm transformer switch 41H are connected to the high-potential side path 54H, as shown in Figure 3.

[0039] The control device 100 performs charging control, supplying input power from an external AC power source to the storage battery 220 via the charger 10. This control will be explained below using the flowchart in Figure 4.

[0040] In step S10, it is determined whether or not an instruction for three-phase charging control has been given. In this embodiment, an instruction transmitted from the higher-level control device 101 via CAN communication or the like is received, and based on the received instruction, it is determined whether or not an instruction for three-phase charging control has been given.

[0041] Three-phase charging control is a control system that charges the battery 220 with power from a three-phase AC power supply 200. When a three-phase charging instruction is given, the first cutoff switch 90A, the second cutoff switch 90B, and the third cutoff switch 90C are turned on by the higher-level control device 101, as shown in Figure 2.

[0042] If a positive determination is made in step S10, the process proceeds to step S11, where the changeover switch 45 is controlled so that the connection point of the inductor 42 and the capacitor 43 is connected to the high-potential path 54H (see Figure 2).

[0043] In step S12, the switching control of the power factor correction circuit 20 is performed. Specifically, the switching control of the first, second, and third upper arm switches S1H, S2H, S3H and the first, second, and third lower arm switches S1L, S2L, S3L is performed in order to convert the AC power input from the first AC terminal Tac1, the second AC terminal Tac2, and the third AC terminal Tac3 into DC power and output it. In each phase, the upper arm switches and lower arm switches are turned on alternately with a dead time in between. In each phase, the switching period of the upper and lower arm switches is the same.

[0044] In step S13, step-down control is performed by alternately turning on the upper and lower arm transformer switches 41H and 41L of the step-down chopper circuit 40 to reduce the DC voltage input to the step-down chopper circuit 40 to a target voltage Vtgt. Specifically, the duty cycle is calculated to feed back the detected voltage of the DC voltage sensor 82 to the target voltage Vtgt. The duty cycle is the ratio (Ton / Tsw) of the on period Ton of the upper arm transformer switch 41H to one switching period Tsw. Then, based on the calculated duty cycle, the upper and lower arm transformer switches 41H and 41L are turned on alternately.

[0045] Furthermore, in step-down control, it is not necessary to keep the lower arm transformer switch 41L in the OFF position and perform synchronous rectification.

[0046] In step S14, the switching control of the DC-DC converter 50 is performed. Specifically, the pair of first and fourth conversion switches Q1 and Q4 and the pair of second and third conversion switches Q2 and Q3 are turned on alternately, and the pair of fifth and eighth conversion switches Q5 and Q8 and the pair of sixth and seventh conversion switches Q6 and Q7 are turned on alternately.

[0047] During three-phase charging control, the voltage applied to the second smoothing capacitor 55 can be reduced by step-down control.

[0048] On the other hand, if a negative determination is made in step S10, the process proceeds to step S15, where it is determined whether or not an instruction for single-phase charging control has been given based on the instruction received from the higher-level control device 101.

[0049] Single-phase charging control is a control method for charging the battery 220 with power from a single-phase AC power supply 210. When a single-phase charging instruction is given, as shown in Figure 3, the first cutoff switch 90A and the third cutoff switch 90C are turned on by the higher-level control device 101, and the second cutoff switch 90B is turned off by the higher-level control device 101.

[0050] If a positive determination is made in step S15, the process proceeds to step S16, where the changeover switch 45 is controlled so that the high-potential side terminal and the first terminal TP of the upper arm transformer switch 41H are connected to the high-potential side path 54H (see Figure 3). As a result, the capacitor 43 of the step-down chopper circuit 40 becomes a compensation capacitor used in the pulsation compensation control described later.

[0051] In step S17, the switching control of the power factor correction circuit 20 is performed. Specifically, the switching control of the first upper arm switch S1H and the first lower arm switch S1L is performed in order to convert the AC power input from the first AC terminal Tac1 and the third AC terminal Tac3 into DC power and output it. The first upper arm switch S1H and the first lower arm switch S1L are turned on alternately in synchronous order with a dead time in between. The switching period of the first upper and lower arm switches S1H and S1L is the same, and is the same as the switching period during three-phase charging control.

[0052] Furthermore, during the first period in which current flows from the third AC terminal Tac3 to the first AC terminal Tac1 via the single-phase AC power supply 210, the third lower arm switch S3L is turned on and the third upper arm switch S3H is turned off. On the other hand, during the second period in which current flows from the first AC terminal Tac1 to the third AC terminal Tac3 via the single-phase AC power supply 210, the third upper arm switch S3H is turned on and the third lower arm switch S3L is turned off. Whether the current timing falls within the first or second period can be determined, for example, based on the detected value of the first current sensor 71 or the third current sensor 73. Note that the switching period of the third upper and lower arm switches S3H and S3L in step S17 is the same as the switching period of the output voltage of the single-phase AC power supply 210, and is longer than the switching period of the first upper and lower arm switches S1H and S1L.

[0053] The output voltage of the power factor correction circuit 20 during single-phase charging control (e.g., 400V) is set lower than the output voltage of the power factor correction circuit 20 during three-phase charging control (e.g., 800V).

[0054] In step S18, pulsation compensation control is performed as switching control of the buck chopper circuit 40 to reduce the pulsation of the output voltage from the buck chopper circuit 40 to the DC-DC converter 50. In this control, the switching period of the upper and lower arm transformer switches 41H and 41L is the same as the switching period of the first upper and lower arm switches S1H and S1L.

[0055] In step S19, the switching control of the DC-DC converter 50 is performed. Specifically, the pair of first and fourth conversion switches Q1 and Q4 and the pair of second and third conversion switches Q2 and Q3 are turned on alternately, and the pair of fifth and eighth conversion switches Q5 and Q8 and the pair of sixth and seventh conversion switches Q6 and Q7 are turned on alternately.

[0056] Next, pulsation compensation control in single-phase charging control will be explained. This control reduces the pulsation of the terminal voltage of the second smoothing capacitor 55 of the DC-DC converter 50. This reduces the capacitance required for the second smoothing capacitor 55. Figure 5 is a block diagram showing an example of pulsation compensation control.

[0057] The target compensation voltage calculation unit 110 calculates the target compensation voltage Vcpref, which is the target value of the terminal voltage of the capacitor 43 for reducing the pulsation of the second smoothing capacitor 55. Specifically, for example, the target compensation voltage calculation unit 110 calculates the target compensation voltage Vcpref based on the pulsation compensation amplitude Ppeak, the electrical angle θe, and the following equation (eq1).

[0058]

number

[0059] The voltage control unit 111 includes a compensation voltage deviation calculation unit 112 and a compensation voltage feedback control unit 113. The compensation voltage deviation calculation unit 112 calculates the compensation voltage deviation ΔVp by subtracting the terminal voltage of the capacitor 43 detected by the DC-side voltage sensor 82 (hereinafter referred to as the compensation voltage detection value Vcpr) from the target compensation voltage Vcpref. In this embodiment, the compensation voltage detection value Vcpr is considered positive when the voltage at the first end of the capacitor 43 connected to the inductor 42 is higher than the voltage at the second end.

[0060] The compensation voltage feedback control unit 113 calculates a target feedback current Ifb as an manipulated variable for feedback control of the compensation voltage deviation ΔVp to zero. The feedback control in the compensation voltage feedback control unit 113 is, for example, proportional-integral control.

[0061] The feedforward current calculation unit 114 calculates the target feedforward current Iff based on the pulsation compensation amplitude Ppeak, the electrical angle θe, and the following equation (eq2).

[0062]

number

[0063] The current control unit 115 comprises an adder 116, a compensation current deviation calculation unit 117, and a compensation current feedback control unit 118. The adder 116 calculates the target compensation current Iref by adding the target feedforward current Iff to the target feedback current Ifb. The feedforward current calculation unit 114 is not mandatory. In this case, "Iref = Ifb".

[0064] The compensation current deviation calculation unit 117 calculates the compensation current deviation ΔIp by subtracting the current detected by the current sensor 83 (hereinafter referred to as the compensation current detection value icpr) from the target compensation current Iref. In this embodiment, the compensation current detection value icpr is considered positive when it flows from the capacitor 43 side of the inductor 42 toward the connection point side of the upper and lower arm transformer switches 41H and 41L.

[0065] The compensation current feedback control unit 118 calculates a command voltage Vref as an manipulated variable for feedback control to reduce the compensation current deviation ΔIp to zero. The feedback control in the compensation current feedback control unit 118 is, for example, proportional-integral control.

[0066] The PWM generation unit 119 generates upper and lower arm drive signals to be supplied to the gates of the upper and lower arm transformer switches 41H and 41L by pulse width modulation based on a comparison of the magnitude of the command voltage Vref and the carrier signal. By supplying the upper and lower arm drive signals to the gates of the upper and lower arm transformer switches 41H and 41L, pulsation reduction control is performed.

[0067] Figure 6 shows the changes in the compensation voltage detection value Vcpr, the output voltage Vac and output current iac of the single-phase AC power supply 210, the compensation current detection value icpr, the first current detection value i1r, the output power Pac of the single-phase AC power supply 210, the power Pcpr (=Vcpr × icpr) of the capacitor 43, and the DC power Pdc output from the step-down chopper circuit 40 during single-phase charging control. Note that the output voltage Vac of the single-phase AC power supply 210 is considered positive when the voltage on the first AC terminal Tac1 side is higher than the voltage on the third AC terminal Tac3 side. The output current iac of the single-phase AC power supply 210 is considered positive when it flows from the third AC terminal Tac3 side to the first AC terminal Tac1 side.

[0068] As shown in Figure 6, single-phase charging control is performed such that the phase difference between the output voltage Vac of the single-phase AC power supply 210 and the first current detection value i1r becomes 0 (i.e., the power factor is 1) through high-frequency switching control of the first upper and lower arm switches S1H and S1L and low-frequency switching control of the third upper and lower arm switches S3H and S3L.

[0069] In the example shown in Figure 6, the output power Pac of the single-phase AC power supply 210 (i.e., the input power of the charger 10) pulsates at a frequency twice the fundamental frequency of the output voltage Vac of the single-phase AC power supply 210. The upper and lower arm transformer switches 41H and 41L are switched to control the compensation voltage detection value Vcpr to a target compensation voltage Vcpref to reduce this pulsating component. As a result, the pulsating component of the input power is absorbed by the capacitor 43 as reactive power, and the DC power Pdc transmitted from the step-down chopper circuit 40 to the DC-DC converter 50 becomes approximately constant. Consequently, the pulsation of the terminal voltage of the second smoothing capacitor 55 can be reduced.

[0070] As described above, in this embodiment, during single-phase charging control, pulsation of the terminal voltage of the second smoothing capacitor 55 can be reduced by pulsation compensation control. On the other hand, during three-phase charging control, when the output voltage of the power factor correction circuit 20 is higher than during single-phase charging control, the applied voltage to the second smoothing capacitor 55 can be reduced by step-down control. This reduces the withstand voltage of the second smoothing capacitor 55, and consequently, the second smoothing capacitor 55 can be miniaturized. As a result, for example, a smaller film capacitor can be used as the second smoothing capacitor 55 instead of an electrolytic capacitor.

[0071] <Second Embodiment> The second embodiment will be described below, focusing on the differences from the first embodiment, with reference to the drawings. In this embodiment, the method for determining the 3-phase / single-phase charging control instruction in the control device 100 has been changed.

[0072] Figure 7 shows the overall configuration of the in-vehicle charger according to this embodiment.

[0073] The charger 10 is equipped with a voltage detection circuit 84. The voltage detection circuit 84 detects the voltages of the first and second paths 21 and 22, using the voltage of the third path 23 as a reference. The values ​​detected by the voltage detection circuit 84 are input to the control device 100.

[0074] Figure 8 shows a flowchart of the three-phase / single-phase charging control performed by the control device 100.

[0075] In step S20, the detected values ​​of the voltage detection circuit 84 are obtained when each of the cutoff switches 90A to 90C is turned on.

[0076] In step S21, it is determined whether or not a 3-phase charging control instruction has been given based on the detected values ​​of the voltage detection circuit 84. Specifically, if it is determined that AC voltage has been detected for two or more of the first to third phases based on the detected values, it is determined that a 3-phase charging control instruction has been given.

[0077] In step S22, it is determined whether or not a single-phase charging control instruction has been given based on the detected value of the voltage detection circuit 84. Specifically, if it is determined that an AC voltage has been detected only for the first phase out of the first to third phases based on the detected value, it is determined that a single-phase charging control instruction has been given.

[0078] According to the embodiment described above, the control device 100 itself can determine whether or not charging control has been instructed.

[0079] <Third Embodiment> The third embodiment will now be described, focusing on the differences from the first embodiment, with reference to the drawings. In this embodiment, as shown in Figures 9 and 10, the connection relationship between the step-down chopper circuit 40 and the DC-DC converter 50, which can be realized by the changeover switch 46, has been changed.

[0080] The upper arm transformer switch 41H has an inductor 42 and a capacitor 4 4A series connection of these components is connected in parallel. At the connection point of the upper and lower arm transformer switches 41H and 41L, an inductor 42 and a capacitor 4 4 The high-potential side path 54H is connected via a series connection.

[0081] When the changeover switch 46 is controlled to the first state, the inductor 42 and capacitor 4, as shown in Figure 9, are connected. 4 The connection point is connected to the low-potential side path 54L. On the other hand, when the changeover switch 46 is controlled to the second state, as shown in Figure 10, the low-potential side terminal and the second terminal TN of the lower arm transformer switch 41L are connected to the low-potential side path 54L.

[0082] Figure 11 shows a flowchart of the three-phase / single-phase charging control performed by the control device 100.

[0083] If it is determined in step S10 that an instruction for 3-phase charging control has been given, the process proceeds to step S23, and the inductor 42 and capacitor 4 4 The changeover switch 46 is controlled so that the connection point and the low-potential side path 54L are connected (see Figure 9). Then, the process proceeds to step S12.

[0084] If it is determined in step S15 that a single-phase charging control instruction has been given, the process proceeds to step S24, where the changeover switch 46 is controlled so that the low-potential side terminal and the second terminal TN of the lower arm transformer switch 41L are connected to the low-potential side path 54L (see Figure 10). This connects the capacitor 4 of the step-down chopper circuit 40. 4 This will become a compensation capacitor used in pulsation compensation control.

[0085] According to the embodiment described above, the same effects as those of the first embodiment can be achieved.

[0086] <Fourth Embodiment> The fourth embodiment will now be described, focusing on the differences from the first embodiment, with reference to the drawings. In this embodiment, as shown in Figures 12 and 13, the configuration of the step-down chopper circuit 40 and the configuration of the changeover switch have been modified.

[0087] The step-down chopper circuit 40 includes first and second transformer switches 141A and 141B, an inductor 142, and a capacitor 143. In this embodiment, the first and second transformer switches 141A and 141B are N-channel MOSFETs having body diodes.

[0088] The drain of the first transformer switch 141A is connected to the first terminal TP, and the source of the first transformer switch 141A is connected to the first terminal of inductor 142. The second terminal TN is connected to the second terminal of inductor 142. The source of the first transformer switch 141A is connected to the drain of the second transformer switch 141B. The source of the second transformer switch 141B is connected to the first terminal of capacitor 143, and the second terminal of inductor 142 is connected to the second terminal of capacitor 143.

[0089] The charger 10 is equipped with a first changeover switch 146A and a second changeover switch 146B. The first changeover switch 146A selectively connects the high-potential path 54H to the drain and first terminal TP of the first transformer switch 141A, or to the second terminal of the capacitor 143. The second changeover switch 146B selectively connects the low-potential path 54L to the connection point between the second transformer switch 141B and the capacitor 143, or to the second terminal of the capacitor 143.

[0090] The DC voltage sensor 82 detects the terminal voltage of the capacitor 143. The current sensor 83 detects the current flowing through the inductor 142.

[0091] Figure 14 shows a flowchart of the three-phase / single-phase charging control performed by the control device 100.

[0092] If it is determined in step S10 that a 3-phase charging control instruction has been given, the process proceeds to step S25, where the first changeover switch 146A is controlled so that the high-potential side path 54H is connected to the second terminal of the capacitor 143, and the second changeover switch 146B is controlled so that the connection point of the second transformer switch 141B and the capacitor 143 is connected to the low-potential side path 54L (see Figure 12). After that, the process proceeds to step S12.

[0093] If it is determined in step S15 that a single-phase charging control instruction has been given, the process proceeds to step S26, where the first changeover switch 146A is controlled so that the drain and first terminal TP of the first transformer switch 141A are connected to the high-potential side path 54H, and the second changeover switch 146B is controlled so that the second terminal of the capacitor 143 is connected to the low-potential side path 54L (see Figure 13). As a result, the capacitor 143 of the step-down chopper circuit 40 becomes a compensation capacitor used for pulsation compensation control.

[0094] In this embodiment, the pulsation compensation control uses the detected values ​​of the DC voltage sensor 82 and the current sensor 83. In addition, in the step-down control of steps S13 and S18, the first and second transformer switches 141A and 141B are turned on alternately.

[0095] According to the embodiment described above, the withstand voltage of the second smoothing capacitor 55 can be reduced.

[0096] <Fifth Embodiment> The fifth embodiment will now be described, focusing on the differences from the first embodiment, with reference to the drawings. In this embodiment, as shown in Figures 15 and 16, the configuration of the step-down chopper circuit 40 and the configuration of the changeover switch have been changed. This configuration is intended to improve the efficiency of the charger 10 during three-phase charging control.

[0097] The step-down chopper circuit 40 includes a first upper arm transformer switch 241H, a first lower arm transformer switch 241L, a second upper arm transformer switch 242H, and a second lower arm transformer switch 242L. In this embodiment, each of the transformer switches 241H, 241L, 242H, and 242L is an N-channel MOSFET having a body diode.

[0098] The first terminal TP is connected to the drain of the first upper arm transformer switch 241H and the drain of the second upper arm transformer switch 242H. The second terminal TN is connected to the source of the first lower arm transformer switch 241L and the source of the second lower arm transformer switch 242L.

[0099] The step-down chopper circuit 40 includes a first inductor 243, a second inductor 244, a capacitor 246, a first changeover switch 245A, and a second changeover switch 245B. The first terminal of the first inductor 243 is connected to the connection point of the first upper arm transformer switch 241H and the first lower arm transformer switch 241L. The second terminal of the first inductor 243 is connected to the first terminal of the capacitor 246 via the first changeover switch 245A. The second terminal of the capacitor 246 is connected to the source of the first lower arm transformer switch 241L, the source of the second lower arm transformer switch 242L, the second terminal TN, and the low-potential side path 54L.

[0100] The connection point of the second upper arm transformer switch 242H and the second lower arm transformer switch 242L is connected to the first end of the second inductor 244. The first end of the capacitor 246 is connected to the second end of the second inductor 244.

[0101] The first changeover switch 245A electrically connects or disconnects the second terminal of the first inductor 243 to the first terminal of the capacitor 246 and the second terminal of the second inductor 244. The second changeover switch 245B selectively connects the high-potential path 54H to the drain of the first upper arm transformer switch 241H, the drain of the second upper arm transformer switch 242H, the first terminal TP and the high-potential path 54H, or the first terminal of the capacitor 246.

[0102] The DC voltage sensor 82 detects the terminal voltage of the capacitor 246. The current sensor 83 detects the current flowing through the second inductor 244.

[0103] Figure 17 shows a flowchart of the three-phase / single-phase charging control performed by the control device 100.

[0104] If it is determined in step S10 that a 3-phase charging control instruction has been given, the process proceeds to step S30, and the first changeover switch 245A is turned ON (see Figure 15).

[0105] In step S31, the second changeover switch 245B is controlled so that the high-potential path 54H and the first end of the capacitor 246 are connected (see Figure 15). Then, the process proceeds to step S12.

[0106] In step S13, during the step-down control, the first upper arm transformer switch 241H and the first lower arm transformer switch 241L are alternately turned on, and the second upper arm transformer switch 242H and the second lower arm transformer switch 242L are alternately turned on. Here, for the first upper arm transformer switch 241H and the second upper arm transformer switch 242H, for example, the switching timing to ON and the switching timing to OFF can be synchronized. Similarly, for the first lower arm transformer switch 241L and the second lower arm transformer switch 242L, for example, the switching timing to ON and the switching timing to OFF can be synchronized.

[0107] If it is determined in step S15 that a single-phase charging control instruction has been given, the process proceeds to step S32, and the first changeover switch 245A is turned off (see Figure 16).

[0108] In step S33, the second changeover switch 245B is controlled so that the high-potential side path 54H is connected to the drain of the first upper arm transformer switch 241H, the drain of the second upper arm transformer switch 242H, and the first terminal TP (see Figure 16). Then, the process proceeds to step S17. As a result, the capacitor 246 of the step-down chopper circuit 40 becomes a compensation capacitor used for pulsation compensation control. In step S18, the detected values ​​of the DC side voltage sensor 82 and the current sensor 83 are used for pulsation compensation control.

[0109] According to the embodiment described above, the efficiency of the charger 10 during three-phase charging control can be improved.

[0110] <Sixth Embodiment> The sixth embodiment will now be described, focusing on the differences from the fifth embodiment, with reference to the drawings. In this embodiment, as shown in Figures 18 and 19, the connection relationship between the step-down chopper circuit 40 and the DC-DC converter 50, which can be realized by a changeover switch, has been changed.

[0111] The step-down chopper circuit 40 includes a second changeover switch 246C and a capacitor 247. The first terminal of the capacitor 247 is connected to the second terminal of the second inductor 244 and one terminal of the first changeover switch 245A. The second terminal of the capacitor 247 is connected to the drain of the first upper arm transformer switch 241H, the drain of the second upper arm transformer switch 242H, the first terminal TP, and the high-potential side path 54H.

[0112] The second changeover switch 245C selectively connects the low-potential path 54L to the source of the first lower arm transformer switch 241L, the source of the second lower arm transformer switch 242L, the second terminal TN and the low-potential path 54L, or the first terminal of the capacitor 246. The DC voltage sensor 82 detects the terminal voltage of the capacitor 246.

[0113] Next, we will explain the differences between the 3-phase / single-phase charging control of this embodiment and the fifth embodiment.

[0114] In step S31 of Figure 17, the control device 100 controls the second changeover switch 245C so that the low-potential path 54L is connected to the first terminal of the capacitor 247 (see Figure 18). In step S33 of Figure 17, the control device 100 controls the second changeover switch 245C so that the low-potential path 54L is connected to the low-potential terminals of the first and second lower arm transformer switches 241L and 242L (see Figure 19).

[0115] According to the embodiment described above, the same effects as those of the fifth embodiment can be achieved.

[0116] <Other Embodiments> Furthermore, each of the above embodiments may be implemented with the following modifications.

[0117] In the fifth and sixth embodiments, a first changeover switch 245A may be provided to connect the connection point of the first upper and lower arm transformer switches 241H and 241L to the first end of the first inductor 243.

[0118] In the fifth and sixth embodiments, the configuration is not limited to one set of the first upper and lower arm transformer switches 241H, 241L, the first inductor 243, and the first changeover switch 245A, but may be configured with multiple sets. Similarly, the configuration is not limited to one set of the second upper and lower arm transformer switches 242H, 242L, and the second inductor 244, but may be configured with multiple sets.

[0119] The first and second bridge circuits of the DC-DC converter 50 are not limited to the full-bridge circuit shown in Figure 1; for example, a half-bridge circuit may also be used.

[0120] • The power factor correction circuit is not limited to the circuit shown in Figure 1.

[0121] In the power factor correction circuit 20, the first upper arm switch may be composed of a parallel connection of multiple N-channel MOSFETs. The same applies to the first lower arm switch and the second, third upper, and lower arm switches.

[0122] The switches in the power factor correction circuit 20, the step-down chopper circuit 40, and the DC-DC converter 50 are not limited to N-channel MOSFETs, but may also be, for example, IGBTs with freewheeling diodes connected in antiparallel. In this case, the collector of the IGBT corresponds to the high-potential terminal, and the emitter corresponds to the low-potential terminal.

[0123] The mobile body on which the power converter is mounted is not limited to a vehicle; for example, it could be an aircraft or a ship. Furthermore, the mounting location of the power converter is not limited to a mobile body; it could be a stationary device.

[0124] The power conversion device is not limited to one that can handle three-phase AC power and AC loads, but may also be one that can handle four or more phase AC power and AC loads.

[0125] The control unit and its method described herein may be implemented by a dedicated computer provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program. Alternatively, the control unit and its method described herein may be implemented by a dedicated computer provided by configuring a processor by one or more dedicated hardware logic circuits. Alternatively, the control unit and its method described herein may be implemented by one or more dedicated computers configured by a combination of a processor and memory programmed to perform one or more functions and a processor configured by one or more hardware logic circuits. Furthermore, the computer program may be stored as instructions executed by the computer on a computer-readable non-transitional tangible recording medium. [Explanation of symbols]

[0126] 10...Charger, 20...Power factor correction circuit, 40...Step-down chopper circuit, 50...DC-DC converter, 45...Changeover switch, 100...Control device.

Claims

1. Multiple phase AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL) and Equipped with, In a charger (10) configured to allow a multi-phase AC power supply (200) or a single-phase AC power supply (210) to be electrically connected to the AC terminal, An AC / DC converter (20) connected to the aforementioned AC terminal, which converts the AC voltage input from the aforementioned AC terminal into a DC voltage and outputs it, A step-down chopper circuit (40) is connected to the output side of the ADC converter and steps down the DC voltage input from the ADC converter and outputs it. A DC-DC converter (50) connects the output side of the step-down chopper circuit to the DC terminal and transforms the DC voltage input from the step-down chopper circuit and outputs it to the DC terminal, Smoothing capacitor (55), Equipped with, The smoothing capacitor is connected to the input side of the DC-DC converter. The ADC converter has a high-potential input path (25H) and a low-potential input path (25L) that output a DC voltage. The aforementioned step-down chopper circuit is A series connection of the upper arm transformer switch (41H) and the lower arm transformer switch (41L), Inductor (42) and Capacitor (43) and It has, The DC-DC converter has a high-potential path (54H) and a low-potential path (54L), The high-potential path and the low-potential path are connected by the smoothing capacitor. The high-potential side terminal of the upper arm transformer switch is connected to the high-potential side input path. The low-potential side terminal of the lower arm transformer switch is connected to the low-potential side input path. The series connection of the inductor and the capacitor is connected in parallel to the lower arm transformer switch. The low-potential side terminal of the lower arm transformer switch is connected to the low-potential side path. A charger comprising a changeover switch (45) that selectively connects the high-potential side path to the high-potential side terminal of the upper arm transformer switch, or to the connection point of the inductor and the capacitor.

2. Equipped with a control device (100), The control device is When it is determined that the multi-phase AC power supply is electrically connected to the AC terminal, the changeover switch is controlled so that the high-potential side path is connected to the connection point of the inductor and the capacitor. The charger according to claim 1, wherein when it is determined that the single-phase AC power supply is electrically connected to the AC terminal, the changeover switch is controlled so that the high-potential side terminal of the upper arm transformer switch is connected to the high-potential side path.

3. Multiple AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL) and Equipped with, In a charger (10) configured to allow a multi-phase AC power supply (200) or a single-phase AC power supply (210) to be electrically connected to the AC terminal, An AC / DC converter (20) connected to the aforementioned AC terminal, which converts the AC voltage input from the aforementioned AC terminal into a DC voltage and outputs it, A step-down chopper circuit (40) is connected to the output side of the ADC converter and steps down the DC voltage input from the ADC converter and outputs it. A DC-DC converter (50) connects the output side of the step-down chopper circuit to the DC terminal and transforms the DC voltage input from the step-down chopper circuit and outputs it to the DC terminal, Smoothing capacitor (55), Equipped with, The smoothing capacitor is connected to the input side of the DC-DC converter. The ADC converter has a high-potential input path (25H) and a low-potential input path (25L) that output a DC voltage. The aforementioned step-down chopper circuit is A series connection of the upper arm transformer switch (41H) and the lower arm transformer switch (41L), Inductor (42) and Capacitor (44) and, It has, The DC-DC converter has a high-potential path (54H) and a low-potential path (54L), The high-potential path and the low-potential path are connected by the smoothing capacitor. The high-potential side terminal of the upper arm transformer switch is connected to the high-potential side input path. The low-potential side terminal of the lower arm transformer switch is connected to the low-potential side input path. The series connection of the inductor and the capacitor is connected in parallel to the upper arm transformer switch. The high-potential side terminal of the upper arm transformer switch is connected to the high-potential side path. A charger comprising a changeover switch (46) that selectively connects the low-potential side path to the low-potential side terminal of the lower arm transformer switch, or to the connection point of the inductor and the capacitor.

4. Equipped with a control device (100), The control device is When it is determined that the multi-phase AC power supply is electrically connected to the AC terminal, the changeover switch is controlled so that the low-potential path is connected to the connection point of the inductor and the capacitor. The charger according to claim 3, wherein, when it is determined that the single-phase AC power supply is electrically connected to the AC terminal, the changeover switch is controlled so that the low-potential path is connected to the low-potential terminal of the lower arm transformer switch.

5. When the control device determines that the single-phase AC power supply is electrically connected to the AC terminal and that power is transmitted between the AC terminal and the DC terminal, it controls the switching of the upper and lower arm transformer switches in order to reduce the pulsation of the terminal voltage of the smoothing capacitor. The charger according to claim 2 or 4, wherein when it is determined that the multi-phase AC power supply is electrically connected to the AC terminal and that power is transmitted between the AC terminal and the DC terminal, the upper and lower arm transformer switches are switched to step down the DC voltage input to the step-down chopper circuit and output it to the DC-DC converter.

6. Multiple AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL) and Equipped with, In a charger (10) configured to allow a multi-phase AC power supply (200) or a single-phase AC power supply (210) to be electrically connected to the AC terminal, An AC / DC converter (20) connected to the aforementioned AC terminal, which converts the AC voltage input from the aforementioned AC terminal into a DC voltage and outputs it, A step-down chopper circuit (40) is connected to the output side of the ADC converter and steps down the DC voltage input from the ADC converter and outputs it. A DC-DC converter (50) connects the output side of the step-down chopper circuit to the DC terminal and transforms the DC voltage input from the step-down chopper circuit and outputs it to the DC terminal, Smoothing capacitor (55), Equipped with, The smoothing capacitor is connected to the input side of the DC-DC converter. The ADC converter has a high-potential input path (25H) and a low-potential input path (25L) that output a DC voltage. The aforementioned step-down chopper circuit is A series connection of the first upper arm transformer switch (241H) and the first lower arm transformer switch (241L), A series connection of the second upper arm transformer switch (242H) and the second lower arm transformer switch (242L), The first inductor (243) and the second inductor (244), Capacitor (246), It has, The DC-DC converter has a high-potential path (54H) and a low-potential path (54L), The high-potential path and the low-potential path are connected by the smoothing capacitor. The high-potential side terminals of the first and second upper arm transformer switches are connected to the high-potential side input path. The low-potential terminals of the first and second lower arm transformer switches are connected to the low-potential input path. First changeover switch (245A), The second changeover switch (245B), Equipped with, The connection point of the first upper arm transformer switch and the first lower arm transformer switch is connected to the first end of the series connection of the first inductor and the first changeover switch. The first end of the capacitor is connected to the second end of the series connection of the first inductor and the first changeover switch. The second terminal of the capacitor is connected to the low-potential side terminal of the first and second lower arm transformer switches and the low-potential side path. The first end of the capacitor is connected to the connection point of the second upper arm transformer switch and the second lower arm transformer switch via a second inductor. The second changeover switch selectively connects the high-potential side path to the high-potential side terminals of the first and second upper arm transformer switches, or to the first end of the capacitor, in a charger.

7. Equipped with a control device (100), The control device is When it is determined that the multi-phase AC power supply is electrically connected to the AC terminal, the first changeover switch is turned on, and the second changeover switch is controlled so that the high-potential side path is connected to the first end of the capacitor. The charger according to claim 6, which, when it is determined that the single-phase AC power supply is electrically connected to the AC terminal, turns off the first changeover switch and controls the second changeover switch so that the high-potential side path is connected to the high-potential side terminal of the first and second upper arm transformer switches.

8. Multiple AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL) and Equipped with, In a charger (10) configured to allow a multi-phase AC power supply (200) or a single-phase AC power supply (210) to be electrically connected to the AC terminal, An AC / DC converter (20) connected to the aforementioned AC terminal, which converts the AC voltage input from the aforementioned AC terminal into a DC voltage and outputs it, A step-down chopper circuit (40) is connected to the output side of the ADC converter and steps down the DC voltage input from the ADC converter and outputs it. A DC-DC converter (50) connects the output side of the step-down chopper circuit to the DC terminal and transforms the DC voltage input from the step-down chopper circuit and outputs it to the DC terminal, Smoothing capacitor (55), Equipped with, The smoothing capacitor is connected to the input side of the DC-DC converter. The ADC converter has a high-potential input path (25H) and a low-potential input path (25L) that output a DC voltage. The aforementioned step-down chopper circuit is A series connection of the first upper arm transformer switch (241H) and the first lower arm transformer switch (241L), A series connection of the second upper arm transformer switch (242H) and the second lower arm transformer switch (242L), The first inductor (243) and the second inductor (244), Capacitor (247), It has, The DC-DC converter has a high-potential path (54H) and a low-potential path (54L), The high-potential path and the low-potential path are connected by the smoothing capacitor. The high-potential side terminals of the first and second upper arm transformer switches are connected to the high-potential side input path. The low-potential terminals of the first and second lower arm transformer switches are connected to the low-potential input path. First changeover switch (245A), The second changeover switch (245C), Equipped with, The connection point of the first upper arm transformer switch and the first lower arm transformer switch is connected to the first end of the series connection of the first inductor and the first changeover switch. The first end of the capacitor is connected to the second end of the series connection of the first inductor and the first changeover switch. The second terminal of the capacitor is connected to the high-potential side terminal of the first and second upper arm transformer switches and the high-potential side path. The first end of the capacitor is connected to the connection point of the second upper arm transformer switch and the second lower arm transformer switch via a second inductor. The second changeover switch selectively connects the low-potential side path to the low-potential side terminals of the first and second lower arm transformer switches, or to the first end of the capacitor, in a charger.

9. Equipped with a control device (100), The control device is When it is determined that the multi-phase AC power supply is electrically connected to the AC terminal, the first changeover switch is turned on, and the second changeover switch is controlled so that the low-potential side path is connected to the first end of the capacitor. The charger according to claim 8, wherein when it is determined that the single-phase AC power supply is electrically connected to the AC terminal, the first changeover switch is turned off and the second changeover switch is controlled so that the low-potential path is connected to the low-potential terminal of the first and second lower arm transformer switches.

10. When the control device determines that the single-phase AC power supply is electrically connected to the AC terminal and that power is transmitted between the AC terminal and the DC terminal, it performs switching control of the second upper and lower arm transformer switch in order to reduce the pulsation of the terminal voltage of the smoothing capacitor. The charger according to claim 7 or 9, wherein when it is determined that the multi-phase AC power supply is electrically connected to the AC terminal and that power is transmitted between the AC terminal and the DC terminal, the first upper and lower arm transformer switch and the second upper and lower arm transformer switch are switched to step down the DC voltage input to the step-down chopper circuit and output it to the DC-DC converter.

11. In a program executed by a computer (100a) applied to a charger (10), The aforementioned charger, Multiple phase AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL) and Equipped with, The charger is configured such that a multi-phase AC power supply (200) or a single-phase AC power supply (210) can be electrically connected to the AC terminal. The aforementioned charger, An AC / DC converter (20) connected to the aforementioned AC terminal, which converts the AC voltage input from the aforementioned AC terminal into a DC voltage and outputs it, A step-down chopper circuit (40) is connected to the output side of the ADC converter and steps down the DC voltage input from the ADC converter and outputs it. A DC-DC converter (50) connects the output side of the step-down chopper circuit to the DC terminal and transforms the DC voltage input from the step-down chopper circuit and outputs it to the DC terminal, Smoothing capacitor (55), Changeover switch (45), Equipped with, The ADC converter has a high-potential input path (25H) and a low-potential input path (25L) that output a DC voltage. The aforementioned step-down chopper circuit is A series connection of the upper arm transformer switch (41H) and the lower arm transformer switch (41L), Inductor (42) and Capacitor (43) and It has, The DC-DC converter has a high-potential path (54H) and a low-potential path (54L), The high-potential path and the low-potential path are connected by the smoothing capacitor. The high-potential side terminal of the upper arm transformer switch is connected to the high-potential side input path. The low-potential side terminal of the lower arm transformer switch is connected to the low-potential side input path. The series connection of the inductor and the capacitor is connected in parallel to the lower arm transformer switch. The low-potential side terminal of the lower arm transformer switch is connected to the low-potential side path. The aforementioned changeover switch selectively connects the high-potential side path to the high-potential side terminal of the upper arm transformer switch, or to the connection point of the inductor and the capacitor. To the aforementioned computer, When it is determined that the multi-phase AC power supply is electrically connected to the AC terminal, the process of controlling the changeover switch so that the high-potential side path is connected to the connection point of the inductor and the capacitor, A program that, when it is determined that the single-phase AC power supply is electrically connected to the AC terminal, causes the program to execute a process that controls the changeover switch so that the high-potential side terminal of the upper arm transformer switch is connected to the high-potential side path.

12. In a program executed by a computer (100a) applied to a charger (10), The aforementioned charger, Multiple phase AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL) and Equipped with, The charger is configured such that a multi-phase AC power supply (200) or a single-phase AC power supply (210) can be electrically connected to the AC terminal. The aforementioned charger, An AC / DC converter (20) connected to the aforementioned AC terminal, which converts the AC voltage input from the aforementioned AC terminal into a DC voltage and outputs it, A step-down chopper circuit (40) is connected to the output side of the ADC converter and steps down the DC voltage input from the ADC converter and outputs it. A DC-DC converter (50) connects the output side of the step-down chopper circuit to the DC terminal and transforms the DC voltage input from the step-down chopper circuit and outputs it to the DC terminal, Smoothing capacitor (55), Changeover switch (46), Equipped with, The ADC converter has a high-potential input path (25H) and a low-potential input path (25L) that output a DC voltage. The aforementioned step-down chopper circuit is A series connection of the upper arm transformer switch (41H) and the lower arm transformer switch (41L), Inductor (42) and Capacitor (44) and, It has, The DC-DC converter has a high-potential path (54H) and a low-potential path (54L), The high-potential path and the low-potential path are connected by the smoothing capacitor. The high-potential side terminal of the upper arm transformer switch is connected to the high-potential side input path. The low-potential side terminal of the lower arm transformer switch is connected to the low-potential side input path. The series connection of the inductor and the capacitor is connected in parallel to the upper arm transformer switch. The high-potential side terminal of the upper arm transformer switch is connected to the high-potential side path. The aforementioned changeover switch selectively connects the low-potential side path to the low-potential side terminal of the lower arm transformer switch, or to the connection point of the inductor and the capacitor. To the aforementioned computer, When it is determined that the multi-phase AC power supply is electrically connected to the AC terminal, the process of controlling the changeover switch so that the low-potential side path is connected to the connection point of the inductor and the capacitor, A program that, when it is determined that the single-phase AC power supply is electrically connected to the AC terminal, causes the program to execute a process that controls the changeover switch so that the low-potential path is connected to the low-potential terminal of the lower arm transformer switch.

13. In a program executed by a computer (100a) applied to a charger (10), The aforementioned charger, Multiple phase AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL) and Equipped with, The charger is configured such that a multi-phase AC power supply (200) or a single-phase AC power supply (210) can be electrically connected to the AC terminal. The aforementioned charger, An AC / DC converter (20) connected to the aforementioned AC terminal, which converts the AC voltage input from the aforementioned AC terminal into a DC voltage and outputs it, A step-down chopper circuit (40) is connected to the output side of the ADC converter and steps down the DC voltage input from the ADC converter and outputs it. A DC-DC converter (50) connects the output side of the step-down chopper circuit to the DC terminal and transforms the DC voltage input from the step-down chopper circuit and outputs it to the DC terminal, Smoothing capacitor (55), First changeover switch (245A), The second changeover switch (245B), Equipped with, The ADC converter has a high-potential input path (25H) and a low-potential input path (25L) that output a DC voltage. The aforementioned step-down chopper circuit is A series connection of the first upper arm transformer switch (241H) and the first lower arm transformer switch (241L), A series connection of the second upper arm transformer switch (242H) and the second lower arm transformer switch (242L), The first inductor (243) and the second inductor (244), Capacitor (246), It has, The DC-DC converter has a high-potential path (54H) and a low-potential path (54L), The high-potential path and the low-potential path are connected by the smoothing capacitor. The high-potential side terminals of the first and second upper arm transformer switches are connected to the high-potential side input path. The low-potential terminals of the first and second lower arm transformer switches are connected to the low-potential input path. The connection point of the first upper arm transformer switch and the first lower arm transformer switch is connected to the first end of the series connection of the first inductor and the first changeover switch. The first end of the capacitor is connected to the second end of the series connection of the first inductor and the first changeover switch. The second terminal of the capacitor is connected to the low-potential side terminal of the first and second lower arm transformer switches and the low-potential side path. The first end of the capacitor is connected to the connection point of the second upper arm transformer switch and the second lower arm transformer switch via a second inductor. The second changeover switch selectively connects the high-potential side path to the high-potential side terminals of the first and second upper arm transformer switches, or to the first end of the capacitor. To the aforementioned computer, When it is determined that the multi-phase AC power supply is electrically connected to the AC terminal, the process involves turning on the first changeover switch and controlling the second changeover switch so that the high-potential side path is connected to the first end of the capacitor. A program that, when it is determined that the single-phase AC power supply is electrically connected to the AC terminal, turns off the first changeover switch and controls the second changeover switch so that the high-potential path is connected to the high-potential terminal of the first and second upper arm transformer switches.

14. In a program executed by a computer (100a) applied to a charger (10), The aforementioned charger, Multiple phase AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL) and Equipped with, The charger is configured such that a multi-phase AC power supply (200) or a single-phase AC power supply (210) can be electrically connected to the AC terminal. The aforementioned charger, An AC / DC converter (20) connected to the aforementioned AC terminal, which converts the AC voltage input from the aforementioned AC terminal into a DC voltage and outputs it, A step-down chopper circuit (40) is connected to the output side of the ADC converter and steps down the DC voltage input from the ADC converter and outputs it. A DC-DC converter (50) connects the output side of the step-down chopper circuit to the DC terminal and transforms the DC voltage input from the step-down chopper circuit and outputs it to the DC terminal, Smoothing capacitor (55), First changeover switch (245A), The second changeover switch (245C), Equipped with, The ADC converter has a high-potential input path (25H) and a low-potential input path (25L) that output a DC voltage. The aforementioned step-down chopper circuit is A series connection of the first upper arm transformer switch (241H) and the first lower arm transformer switch (241L), A series connection of the second upper arm transformer switch (242H) and the second lower arm transformer switch (242L), The first inductor (243) and the second inductor (244), Capacitor (247), It has, The DC-DC converter has a high-potential path (54H) and a low-potential path (54L), The high-potential path and the low-potential path are connected by the smoothing capacitor. The high-potential side terminals of the first and second upper arm transformer switches are connected to the high-potential side input path. The low-potential terminals of the first and second lower arm transformer switches are connected to the low-potential input path. The connection point of the first upper arm transformer switch and the first lower arm transformer switch is connected to the first end of the series connection of the first inductor and the first changeover switch. The first end of the capacitor is connected to the second end of the series connection of the first inductor and the first changeover switch. The second terminal of the capacitor is connected to the high-potential side terminal of the first and second upper arm transformer switches and the high-potential side path. The first end of the capacitor is connected to the connection point of the second upper arm transformer switch and the second lower arm transformer switch via a second inductor. The second changeover switch selectively connects the low-potential side path to the low-potential side terminals of the first and second lower arm transformer switches, or to the first end of the capacitor. To the aforementioned computer, When it is determined that the multi-phase AC power supply is electrically connected to the AC terminal, the process of turning on the first changeover switch and controlling the second changeover switch so that the low-potential side path is connected to the first end of the capacitor, A program that, when it is determined that the single-phase AC power supply is electrically connected to the AC terminal, turns off the first changeover switch and controls the second changeover switch so that the low-potential path is connected to the low-potential terminal of the first and second lower arm transformer switches.

15. A control method performed by a computer (100a) applied to a charger (10), The aforementioned charger, Multiple phase AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL) and Equipped with, The charger is configured such that a multi-phase AC power supply (200) or a single-phase AC power supply (210) can be electrically connected to the AC terminal. The aforementioned charger, An AC / DC converter (20) connected to the aforementioned AC terminal, which converts the AC voltage input from the aforementioned AC terminal into a DC voltage and outputs it, A step-down chopper circuit (40) is connected to the output side of the ADC converter and steps down the DC voltage input from the ADC converter and outputs it. A DC-DC converter (50) connects the output side of the step-down chopper circuit to the DC terminal and transforms the DC voltage input from the step-down chopper circuit and outputs it to the DC terminal, Smoothing capacitor (55), Changeover switch (45), Equipped with, The ADC converter has a high-potential input path (25H) and a low-potential input path (25L) that output a DC voltage. The aforementioned step-down chopper circuit is A series connection of the upper arm transformer switch (41H) and the lower arm transformer switch (41L), Inductor (42) and Capacitor (43) and It has, The DC-DC converter has a high-potential path (54H) and a low-potential path (54L), The high-potential path and the low-potential path are connected by the smoothing capacitor. The high-potential side terminal of the upper arm transformer switch is connected to the high-potential side input path. The low-potential side terminal of the lower arm transformer switch is connected to the low-potential side input path. The series connection of the inductor and the capacitor is connected in parallel to the lower arm transformer switch. The low-potential side terminal of the lower arm transformer switch is connected to the low-potential side path. The aforementioned changeover switch selectively connects the high-potential side path to the high-potential side terminal of the upper arm transformer switch, or to the connection point of the inductor and the capacitor. To the aforementioned computer, When it is determined that the multi-phase AC power supply is electrically connected to the AC terminal, the process of controlling the changeover switch so that the high-potential side path is connected to the connection point of the inductor and the capacitor, A control method that, when it is determined that the single-phase AC power supply is electrically connected to the AC terminal, causes the changeover switch to be controlled so that the high-potential side terminal of the upper arm transformer switch is connected to the high-potential side path.

16. A control method performed by a computer (100a) applied to a charger (10), The aforementioned charger, Multiple phase AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL) and Equipped with, The charger is configured such that a multi-phase AC power supply (200) or a single-phase AC power supply (210) can be electrically connected to the AC terminal. The aforementioned charger, An AC / DC converter (20) connected to the aforementioned AC terminal, which converts the AC voltage input from the aforementioned AC terminal into a DC voltage and outputs it, A step-down chopper circuit (40) is connected to the output side of the ADC converter and steps down the DC voltage input from the ADC converter and outputs it. A DC-DC converter (50) connects the output side of the step-down chopper circuit to the DC terminal and transforms the DC voltage input from the step-down chopper circuit and outputs it to the DC terminal, Smoothing capacitor (55), Changeover switch (46), Equipped with, The ADC converter has a high-potential input path (25H) and a low-potential input path (25L) that output a DC voltage. The aforementioned step-down chopper circuit is A series connection of the upper arm transformer switch (41H) and the lower arm transformer switch (41L), Inductor (42) and Capacitor (44) and, It has, The DC-DC converter has a high-potential path (54H) and a low-potential path (54L), The high-potential path and the low-potential path are connected by the smoothing capacitor. The high-potential side terminal of the upper arm transformer switch is connected to the high-potential side input path. The low-potential side terminal of the lower arm transformer switch is connected to the low-potential side input path. The series connection of the inductor and the capacitor is connected in parallel to the upper arm transformer switch. The high-potential side terminal of the upper arm transformer switch is connected to the high-potential side path. The aforementioned changeover switch selectively connects the low-potential side path to the low-potential side terminal of the lower arm transformer switch, or to the connection point of the inductor and the capacitor. To the aforementioned computer, When it is determined that the multi-phase AC power supply is electrically connected to the AC terminal, the process of controlling the changeover switch so that the low-potential side path is connected to the connection point of the inductor and the capacitor, A control method that, when it is determined that the single-phase AC power supply is electrically connected to the AC terminal, causes the changeover switch to be controlled so that the low-potential path is connected to the low-potential terminal of the lower arm transformer switch.

17. A control method performed by a computer (100a) applied to a charger (10), The aforementioned charger, Multiple phase AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL) and Equipped with, The charger is configured such that a multi-phase AC power supply (200) or a single-phase AC power supply (210) can be electrically connected to the AC terminal. The aforementioned charger, An AC / DC converter (20) connected to the aforementioned AC terminal, which converts the AC voltage input from the aforementioned AC terminal into a DC voltage and outputs it, A step-down chopper circuit (40) is connected to the output side of the ADC converter and steps down the DC voltage input from the ADC converter and outputs it. A DC-DC converter (50) connects the output side of the step-down chopper circuit to the DC terminal and transforms the DC voltage input from the step-down chopper circuit and outputs it to the DC terminal, Smoothing capacitor (55), First changeover switch (245A), The second changeover switch (245B), Equipped with, The ADC converter has a high-potential input path (25H) and a low-potential input path (25L) that output a DC voltage. The aforementioned step-down chopper circuit is A series connection of the first upper arm transformer switch (241H) and the first lower arm transformer switch (241L), A series connection of the second upper arm transformer switch (242H) and the second lower arm transformer switch (242L), The first inductor (243) and the second inductor (244), Capacitor (246), It has, The DC-DC converter has a high-potential path (54H) and a low-potential path (54L), The high-potential path and the low-potential path are connected by the smoothing capacitor. The high-potential side terminals of the first and second upper arm transformer switches are connected to the high-potential side input path. The low-potential terminals of the first and second lower arm transformer switches are connected to the low-potential input path. The connection point of the first upper arm transformer switch and the first lower arm transformer switch is connected to the first end of the series connection of the first inductor and the first changeover switch. The first end of the capacitor is connected to the second end of the series connection of the first inductor and the first changeover switch. The second terminal of the capacitor is connected to the low-potential side terminal of the first and second lower arm transformer switches and the low-potential side path. The first end of the capacitor is connected to the connection point of the second upper arm transformer switch and the second lower arm transformer switch via a second inductor. The second changeover switch selectively connects the high-potential side path to the high-potential side terminals of the first and second upper arm transformer switches, or to the first end of the capacitor. To the aforementioned computer, When it is determined that the multi-phase AC power supply is electrically connected to the AC terminal, the process involves turning on the first changeover switch and controlling the second changeover switch so that the high-potential side path is connected to the first end of the capacitor. A control method that, when it is determined that the single-phase AC power supply is electrically connected to the AC terminal, turns off the first changeover switch and controls the second changeover switch so that the high-potential side path is connected to the high-potential side terminal of the first and second upper arm transformer switches.

18. A control method performed by a computer (100a) applied to a charger (10), The aforementioned charger, Multiple phase AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL) and Equipped with, The charger is configured such that a multi-phase AC power supply (200) or a single-phase AC power supply (210) can be electrically connected to the AC terminal. The aforementioned charger, An AC / DC converter (20) connected to the aforementioned AC terminal, which converts the AC voltage input from the aforementioned AC terminal into a DC voltage and outputs it, A step-down chopper circuit (40) is connected to the output side of the ADC converter and steps down the DC voltage input from the ADC converter and outputs it. A DC-DC converter (50) connects the output side of the step-down chopper circuit to the DC terminal and transforms the DC voltage input from the step-down chopper circuit and outputs it to the DC terminal, Smoothing capacitor (55), First changeover switch (245A), The second changeover switch (245C), Equipped with, The ADC converter has a high-potential input path (25H) and a low-potential input path (25L) that output a DC voltage. The aforementioned step-down chopper circuit is A series connection of the first upper arm transformer switch (241H) and the first lower arm transformer switch (241L), A series connection of the second upper arm transformer switch (242H) and the second lower arm transformer switch (242L), The first inductor (243) and the second inductor (244), Capacitor (247), It has, The DC-DC converter has a high-potential path (54H) and a low-potential path (54L), The high-potential path and the low-potential path are connected by the smoothing capacitor. The high-potential side terminals of the first and second upper arm transformer switches are connected to the high-potential side input path. The low-potential terminals of the first and second lower arm transformer switches are connected to the low-potential input path. The connection point of the first upper arm transformer switch and the first lower arm transformer switch is connected to the first end of the series connection of the first inductor and the first changeover switch. The first end of the capacitor is connected to the second end of the series connection of the first inductor and the first changeover switch. The second terminal of the capacitor is connected to the high-potential side terminal of the first and second upper arm transformer switches and the high-potential side path. The first end of the capacitor is connected to the connection point of the second upper arm transformer switch and the second lower arm transformer switch via a second inductor. The second changeover switch selectively connects the low-potential side path to the low-potential side terminals of the first and second lower arm transformer switches, or to the first end of the capacitor. To the aforementioned computer, When it is determined that the multi-phase AC power supply is electrically connected to the AC terminal, the process of turning on the first changeover switch and controlling the second changeover switch so that the low-potential side path is connected to the first end of the capacitor, A control method that, when it is determined that the single-phase AC power supply is electrically connected to the AC terminal, turns off the first changeover switch and controls the second changeover switch so that the low-potential path is connected to the low-potential terminal of the first and second lower arm transformer switches.

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