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 and a program. [Background technology]

[0002] 2. Description of the Related Art Conventionally, chargers compatible with both three-phase AC power supplies and single-phase AC power supplies have been known. An example of such a charger is a power conversion device disclosed in Patent Document 1.

[0003] The charger is equipped with an ACDC converter. The ACDC converter has upper and lower arm switches provided corresponding to each phase. The high potential side terminal of the upper arm switch of each phase is connected to a high potential side DC terminal, and the low potential side terminal of the lower arm switch of each phase is connected to a 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 for each phase, and a compensation capacitor and a changeover switch provided for one of the phases. By operating the changeover switch, the compensation capacitor is connected in parallel to the series connection of the inductor and the lower arm switch for one phase, or is disconnected from this series connection.

[0005] During single-phase charging control in which a single-phase AC power source is electrically connected to the AC terminal on the input side, the changeover switch is operated so that a compensation capacitor is connected in parallel to the series connection of the inductor and the lower arm switch. In this operating state, switching control is performed for the upper and lower arm switches of the phase to which the compensation capacitor is connected. This makes it possible to reduce pulsation in the terminal voltage of the smoothing capacitor when AC power input from the AC terminal is converted to DC power and output from the DC terminal. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] U.S. Patent No. 8,503,208 Summary of the Invention [Problem to be solved by the invention]

[0007] During three-phase charging control, in which a three-phase AC power supply is electrically connected to the AC terminals, the output voltage of the ACDC converter is higher than during single-phase charging control. Therefore, although the pulsation of the terminal voltage of the smoothing capacitor during single-phase charging control can be reduced, the withstand voltage of the smoothing capacitor is set taking into consideration the output voltage of the ACDC converter during three-phase charging control. As a result, the withstand voltage of the smoothing capacitor cannot be reduced, and problems such as an increase in the physical size of the smoothing capacitor may occur.

[0008] A primary object of the present disclosure is to provide a charger and a program capable of reducing the withstand voltage of a smoothing capacitor. [Means for solving the problem]

[0009] The present disclosure provides a power supply comprising: a multi-phase AC terminal; A DC terminal, Equipped with A charger configured so that a multi-phase AC power source or a single-phase AC power source can be electrically connected to the AC terminals, an AC / DC converter connected to the AC terminal for converting an AC voltage input from the AC terminal into a DC voltage and outputting the DC voltage; A step-down chopper circuit connected to an output side of the ACDC converter for stepping down and outputting a DC voltage input from the ACDC converter; A DC-DC converter and A smoothing capacitor; Equipped with.

[0010] In the present disclosure, the smoothing capacitor is connected to the input side of the DC-DC converter, The DC-DC converter connects the output side of the step-down chopper circuit and the DC terminal, transforms the DC voltage input from the step-down chopper circuit, and outputs the transformed DC voltage to the DC terminal.

[0011] This makes it possible to lower the voltage applied to the smoothing capacitor connected to the input side of the DC-DC converter, thereby reducing the withstand voltage of the smoothing capacitor. [Brief description of the drawings]

[0012] [Figure 1] 1 is an overall configuration diagram of an on-board charger according to a first embodiment. [Diagram 2] FIG. 2 is a diagram showing an on-board charger during three-phase charging. [Diagram 3] FIG. 2 is a diagram showing an on-board charger during single-phase charging. [Figure 4] 4 is a flowchart showing a procedure for controlling charging of a storage battery. [Diagram 5] FIG. 4 is a block diagram of a pulsation compensation control process during single-phase charging control. [Figure 6] 4 is a time chart showing changes in current, voltage, etc. during single-phase charging control. [Figure 7] FIG. 11 is an overall configuration diagram of an on-board charger according to a second embodiment. [Figure 8] 4 is a flowchart showing a procedure for controlling charging of a storage battery. [Figure 9] FIG. 11 is a diagram showing an on-board charger according to a third embodiment during three-phase charging. [Figure 10] FIG. 2 is a diagram showing an on-board charger during single-phase charging. [Figure 11] 4 is a flowchart showing a procedure for controlling charging of a storage battery. [Figure 12] FIG. 13 is a diagram showing an on-board charger according to a fourth embodiment during three-phase charging. [Figure 13] FIG. 2 is a diagram showing an on-board charger during single-phase charging. [Figure 14] 4 is a flowchart showing a procedure for controlling charging of a storage battery. [Figure 15] FIG. 13 is a diagram showing an on-board charger according to a fifth embodiment during three-phase charging. [Figure 16] FIG. 2 is a diagram showing an on-board charger during single-phase charging. [Figure 17] 4 is a flowchart showing a procedure for controlling charging of a storage battery. [Figure 18] FIG. 13 is a diagram showing an on-board charger according to a sixth embodiment during three-phase charging. [Figure 19] FIG. 2 is a diagram showing an on-board charger during single-phase charging. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Several embodiments will be described with reference to the drawings. In several embodiments, functionally and / or structurally corresponding and / or associated parts may be given the same reference numerals or reference numerals with different digits of 100 or more. For corresponding and / or associated parts, the description of other embodiments may be referred to.

[0014] First Embodiment A first embodiment of a charger according to the present invention will be described below with reference to the drawings. The charger according to this embodiment is provided in a vehicle such as an electric vehicle. An in-vehicle charger is also called an on-board charger.

[0015] The charger has an AC terminal and a DC terminal. The charger has a function of converting AC power input via the AC terminal connected to an AC power source outside the vehicle into DC power and outputting the DC power 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. Of the first to third AC terminals Tac1 to Tac3, the first and third AC terminals Tac1 and Tac3 can be connected to a single-phase AC power source 210 outside the vehicle as shown in Fig. 3.

[0017] The charger 10 includes a power factor correction circuit 20. The power factor correction circuit 20 includes upper and lower arm switches for three phases, which are 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, and functions as an ACDC converter. In this embodiment, each of the upper and lower arm switches S1H to S3L is an N-channel MOSFET having a body diode. Therefore, in each of the upper and lower arm switches S1H to S3L, the high potential side terminal is a drain, and the low potential side terminal is a source. Of the first to third phases, for example, the first phase is a U phase, the second phase is a V phase, and the third phase is a 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 of the paths 25H and 25L is an electrical path including a bus bar or the like. The power factor correction circuit 20 includes a first smoothing capacitor 24 that connects 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 a first phase, and connects the low potential side terminal of the first upper arm switch S1H and the high potential side terminal of the first lower arm switch S1L to a first AC terminal Tac1. The second path 22 is an electrical path corresponding to a second phase, and connects the low potential side terminal of the second upper arm switch S2H and the high potential side terminal of the second lower arm switch S2L to a second AC terminal Tac2. The third path 23 is an electrical path corresponding to a third phase, and connects the low potential side terminal of the third upper arm switch S3H and the high potential side terminal of the third lower arm switch S3L to a 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 inductors 31 to 33 may have the same inductance value, and the inductors 31 to 33 may have the same rated current (specifically, temperature rise rated current).

[0021] The charger 10 includes 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 includes 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] A first terminal TP constituting the high potential side input path 25H is connected to the high potential side terminal of the upper arm transformer switch 41H, and a second terminal TN constituting the low potential side input path 25L is connected to the low potential side terminal of the lower arm transformer switch 41L. A first end of an inductor 42 is connected to the low potential side terminal of the upper arm transformer switch 41H and the high potential side terminal of the lower arm transformer switch 41L. A first end of a capacitor 43 is connected to a second end of the inductor 42. A low potential side terminal of the lower arm transformer switch 41L is connected to a second end of the capacitor 43. Note that the first terminal TP may not be configured in the high potential side input path 25H, and the second terminal TN may not be configured in the low potential side input path 25L.

[0023] The charger 10 includes a DCDC converter 50. The DCDC converter 50 transforms the DC voltage input from the step-down chopper circuit 40 and outputs the transformed DC voltage. The DCDC converter 50 is of a DAB (Dual Active Bridge) type and is an isolated DCDC converter including a first bridge circuit 51, a second bridge circuit 52, and a transformer 53 that transmits power between the bridge circuits 51 and 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 of the conversion switches Q1 to Q8 is an N-channel MOSFET having a body diode. Therefore, in each of the conversion switches 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 (for example, an LLC type).

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

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

[0027] In the second bridge circuit 52, a first end of a secondary coil 53B constituting a transformer 53 is connected to a connection point of the fifth and sixth conversion switches Q5 and Q6. A second end of the secondary coil 53B is connected to a 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 a core 53C constituting the transformer 53.

[0028] A high potential side DC terminal TdcH of the charger 10 is connected to a high potential side terminal of the fifth and seventh conversion switches Q5, Q7. A low potential side DC terminal TdcL of the charger 10 is connected to a low potential side terminal of the sixth and eighth conversion switches Q6, Q8. The high potential side terminals of the fifth and seventh conversion switches Q5, Q7 and the low potential side terminals of the sixth and eighth conversion switches Q6, 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 of the DC terminals TdcH, TdcL.

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

[0030] The charger 10 includes first to third current sensors 71 to 73. The first current sensor 71 detects a current flowing through the first inductor 31, the second current sensor 72 detects a current flowing through the second inductor 32, and the third current sensor 73 detects a 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, 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 toward the first, second, and third inductors 31, 32, and 33.

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

[0032] The charger 10 is equipped with a current sensor 83 that detects a 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 of each of the transformer switches 41H, 41L. The detection values ​​of each of the sensors 71-73, 81-83 are input to a control device 100 provided in the charger 10.

[0033] The control device 100 is an electronic control unit mainly composed of a microcomputer 100a. The control device 100 is capable of exchanging information with a higher-level control device 101 that is higher than the control device 100. The higher-level control device 101 is an electronic control unit mainly composed of a microcomputer 101a, and is provided outside the charger 10.

[0034] Each of the microcomputers 100a and 101a includes a CPU (Central Processing Unit). The functions provided by each of the microcomputers 100a and 101a can be provided by software recorded in a substantial memory device and a computer that executes the software, by software alone, by hardware alone, or by a combination of these. For example, when the microcomputer is provided by an electronic circuit that is hardware, the function can be provided by a digital circuit including a large number of logic circuits, or by an analog circuit. For example, the microcomputer executes a program stored in a non-transitory tangible storage medium as a storage unit provided in the microcomputer. The program includes, for example, a program for a charging control process shown in FIG. 4, which will be described later. A set of instructions that constitute the program is executed, thereby executing a method corresponding to the program. The storage unit is, for example, a non-volatile memory. The program stored in the storage unit can be updated via a communication network such as the Internet, for example, OTA (Over The Air), etc.

[0035] In the vehicle, a first cutoff switch 90A, a second cutoff switch 90B, and a third cutoff switch 90C are provided outside the charger 10. 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 blocks 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] 2, a three-phase AC power supply 200 can be electrically connected to the first to third AC terminals Tac1 to Tac3 via first to third cutoff switches 90A to 90C. The three-phase AC power supply 200 is, for example, a system power supply. In the three-phase AC power supply 200, the amplitudes and frequencies of the three-phase output voltages V1, V2, and V3 are the same, and the phases of the output voltages and output currents are shifted by 120° for each phase.

[0037] 3, the single-phase AC power supply 210 can be electrically connected to the first AC terminal Tac1 and the third AC terminal Tac3 via 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. In addition, 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 includes a changeover switch 45 for switching a 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 a first state, the connection point between the inductor 42 and the capacitor 43 is connected to the high potential side path 54H as shown in Fig. 2. On the other hand, when the changeover switch 45 is controlled to a 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 Fig. 3.

[0039] The control device 100 performs charging control for supplying input power from an external AC power supply to the storage battery 220 via the charger 10. This control will be described below with reference to the flowchart of FIG.

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

[0041] The three-phase charging control is a control for charging the storage battery 220 with power from the three-phase AC power supply 200. When a three-phase charging instruction is issued, the first shutoff switch 90A, the second shutoff switch 90B, and the third shutoff switch 90C are turned on by the upper control device 101, as shown in FIG.

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

[0043] In step S12, switching control of the power factor correction circuit 20 is performed. More specifically, switching control is performed on the first, second and third upper arm switches S1H, S2H and S3H and the first, second and third lower arm switches S1L, S2L and S3L to convert 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 the lower arm switches are alternately turned on with dead time in between. In each phase, one switching period of the upper and lower arm switches is the same.

[0044] In step S13, the upper and lower arm transformer switches 41H, 41L of the step-down chopper circuit 40 are alternately turned on to perform step-down control, in which the DC voltage input to the step-down chopper circuit 40 is stepped down to the target voltage Vtgt. In detail, a duty factor is calculated for feedback control of the detected voltage of the DC side voltage sensor 82 to the target voltage Vtgt. The duty factor is the ratio (Ton / Tsw) of the on-period Ton of the upper arm transformer switch 41H to one switching cycle Tsw. Then, the upper and lower arm transformer switches 41H, 41L are alternately turned on based on the calculated duty factor.

[0045] In the step-down control, the lower-arm transformer switch 41L may be kept off and synchronous rectification may not be performed.

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

[0047] During three-phase charging control, the voltage applied to the second smoothing capacitor 55 can be reduced by voltage 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 based on the instruction received from the upper level control device 101 whether or not a single-phase charging control instruction has been issued.

[0049] The single-phase charging control is a control for charging the storage battery 220 with power from the single-phase AC power supply 210. When a single-phase charging instruction is issued, the first shutoff switch 90A and the third shutoff switch 90C are turned on by the upper control device 101, and the second shutoff switch 90B is turned off by the upper control device 101, as shown in FIG.

[0050] If the determination in step S15 is affirmative, 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 FIG. 3). As a result, the capacitor 43 of the step-down chopper circuit 40 serves as a compensation capacitor used for pulsation compensation control, which will be described later.

[0051] In step S17, switching control of the power factor correction circuit 20 is performed. More specifically, switching control of the first upper arm switch S1H and the first lower arm switch S1L is performed to convert 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 alternately turned on in synchronization with each other with a dead time in between. The first upper and lower arm switches S1H and S1L have the same switching period, which is the same as one switching period during three-phase charging control.

[0052] In addition, in a first period in which a 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, in a second period in which a 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 is included in the first period or the second period may be determined based on, for example, the detection value of the first current sensor 71 or the third current sensor 73. Note that one switching period of the third upper and lower arm switches S3H and S3L in step S17 is the same period as one period of the output voltage of the single-phase AC power supply 210 and is longer than one switching period of the first upper and lower arm switches S1H and S1L.

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

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

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

[0056] Next, the pulsation compensation control in the single-phase charging control will be described. 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 the pulsation compensation control.

[0057] The target compensation voltage calculation unit 110 calculates a target compensation voltage Vcpref, which is a target value of the terminal voltage of the capacitor 43 for reducing 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, compensation voltage detection value Vcpr) from the target compensation voltage Vcpref. In this embodiment, the compensation voltage detection value Vcpr is considered to be positive when, of both ends of the capacitor 43, the voltage on the first end side connected to the inductor 42 is higher than the voltage on the second end side.

[0060] The compensation voltage feedback control unit 113 calculates a target feedback current Ifb as a manipulated variable for feedback controlling the compensation voltage deviation ΔVp to 0. 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 a 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 includes an adder 116, a compensation current deviation calculation unit 117, and a compensation current feedback control unit 118. The adder 116 calculates a target compensation current Iref by adding a target feedforward current Iff to a target feedback current Ifb. Note that the feedforward current calculation unit 114 is not essential. 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, the compensation current detection value icpr) from the target compensation current Iref. In this embodiment, the compensation current detection value icpr is considered to be positive when it flows from the capacitor 43 side toward the connection point side of the upper and lower arm transformer switches 41H, 41L, among both ends of the inductor 42.

[0065] The compensation current feedback control unit 118 calculates a command voltage Vref as a manipulated variable for feedback controlling the compensation current deviation ΔIp to 0. The feedback control in the compensation current feedback control unit 118 is, for example, proportional-integral control.

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

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

[0068] By high-frequency switching control of the first upper and lower arm switches S1H, S1L and low-frequency switching control of the third upper and lower arm switches S3H, S3L, single-phase charging control is executed 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), as shown in FIG. 6.

[0069] In the example shown in Fig. 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 and controlled so that the compensation voltage detection value Vcpr is controlled to a target compensation voltage Vcpref for reducing this pulsating component. As a result, the pulsating component of the input power is absorbed as reactive power by the capacitor 43, and the DC power Pdc transmitted from the step-down chopper circuit 40 to the DC-DC converter 50 becomes approximately constant. As a result, the pulsation of the terminal voltage of the second smoothing capacitor 55 can be reduced.

[0070] According to the present embodiment described above, during single-phase charging control, the 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 in which the output voltage of the power factor correction circuit 20 is higher than during single-phase charging control, the voltage applied to the second smoothing capacitor 55 can be reduced by step-down control. This makes it possible to reduce the withstand voltage of the second smoothing capacitor 55, and thus to reduce the size of the second smoothing capacitor 55. As a result, for example, a film capacitor, which is smaller in size, can be used as the second smoothing capacitor 55, instead of an electrolytic capacitor.

[0071] <Second embodiment> Hereinafter, the second embodiment will be described with reference to the drawings, focusing on the differences from the first embodiment. In this embodiment, the method of determining whether the control device 100 issues a three-phase / single-phase charging control instruction is changed.

[0072] FIG. 7 shows the overall configuration of the on-board charger according to this embodiment.

[0073] The charger 10 includes a voltage detection circuit 84. The voltage detection circuit 84 detects the voltages of the first and second paths 21, 22 with respect to the voltage of the third path 23. A detection value of the voltage detection circuit 84 is input to the control device 100.

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

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

[0076] In step S21, it is determined whether or not a command for three-phase charging control has been issued, based on the detection value of the voltage detection circuit 84. Specifically, when it is determined, based on the detection value, that AC voltage has been detected for two or more of the first to third phases, it is determined that a command for three-phase charging control has been issued.

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

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

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

[0080] A series connection of an inductor 42 and a capacitor 43 is connected in parallel to the upper arm transformer switch 41H. A high potential side path 54H is connected to the connection point of the upper and lower arm transformer switches 41H, 41L via a series connection of an inductor 42 and a capacitor 43.

[0081] When the changeover switch 46 is controlled to the first state, the connection point between the inductor 42 and the capacitor 43 is connected to the low potential side path 54L, as shown in Fig. 9. On the other hand, when the changeover switch 46 is controlled to the second state, 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, as shown in Fig. 10.

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

[0083] If it is determined in step S10 that a command for three-phase charging control has been issued, the process proceeds to step S23, where the changeover switch 46 is controlled so as to connect the connection point between the inductor 42 and the capacitor 43 to the low potential side path 54L (see FIG. 9). Then, the process proceeds to step S12.

[0084] If it is determined in step S15 that a single-phase charging control command has been issued, 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 FIG. 10). As a result, the capacitor 43 of the step-down chopper circuit 40 serves as a compensation capacitor used for pulsation compensation control.

[0085] According to the present embodiment described above, it is possible to achieve the same effects as the first embodiment.

[0086] <Fourth embodiment> Hereinafter, the fourth embodiment will be described with reference to the drawings, focusing on the differences from the first embodiment. In this embodiment, as shown in Fig. 12 and Fig. 13, the configuration of the step-down chopper circuit 40 and the configuration of the changeover switch are changed.

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

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

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

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

[0092] If it is determined in step S10 that a command for three-phase charging control has been issued, the process proceeds to step S25, where the first changeover switch 146A is controlled to connect the high potential side path 54H to the second end of the capacitor 143, and the second changeover switch 146B is controlled to connect the connection point of the second transformer switch 141B and the capacitor 143 to the low potential side path 54L (see FIG. 12). Then, the process proceeds to step S12.

[0093] If it is determined in step S15 that a single-phase charging control command has been issued, the process proceeds to step S26, where the first changeover switch 146A is controlled so that the drain and the 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 end of the capacitor 143 is connected to the low potential side path 54L (see FIG. 13). As a result, the capacitor 143 of the step-down chopper circuit 40 serves as a compensation capacitor used for pulsation compensation control.

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

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

[0096] <Fifth embodiment> The fifth embodiment will be described below with reference to the drawings, focusing on the differences from the first embodiment. In this embodiment, the configuration of the step-down chopper circuit 40 and the configuration of the changeover switch are changed as shown in Fig. 15 and Fig. 16. This configuration is for improving 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] A 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. A 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. A first end of the first inductor 243 is connected to a connection point between the first upper arm transformer switch 241H and the first lower arm transformer switch 241L. A second end of the first inductor 243 is connected to a first end of the capacitor 246 via the first changeover switch 245A. A second end 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] A connection point between the second upper arm transformer switch 242H and the second lower arm transformer switch 242L is connected to a first end of the second inductor 244. A first end of the capacitor 246 is connected to a second end of the second inductor 244.

[0101] The first changeover switch 245A electrically connects or disconnects the second end of the first inductor 243 to the first end of the capacitor 246 and the second end of the second inductor 244. The second changeover switch 245B selectively connects the high potential side 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 side path 54H, or the first end of the capacitor 246.

[0102] The DC side 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] FIG. 17 shows a flowchart of the three-phase / single-phase charging control executed by the control device 100.

[0104] If it is determined in step S10 that a command for three-phase charging control has been issued, the process proceeds to step S30, where the first changeover switch 245A is turned on (see FIG. 15).

[0105] In step S31, the second changeover switch 245B is controlled so as to connect the high potential side path 54H to the first end of the capacitor 246 (see FIG. 15). After that, the process proceeds to step S12.

[0106] In the step-down control in step S13, 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 timing of switching on may be synchronized, and the timing of switching off may be synchronized. Also, for the first lower arm transformer switch 241L and the second lower arm transformer switch 242L, for example, the timing of switching on may be synchronized, and the timing of switching off may be synchronized.

[0107] If it is determined in step S15 that a command for single-phase charging control has been issued, the process proceeds to step S32, where the first changeover switch 245A is turned off (see FIG. 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 FIG. 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. Note that in the pulsation compensation control in step S18, the detection values ​​of the DC side voltage sensor 82 and the current sensor 83 are used.

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

[0110] Sixth embodiment Hereinafter, the sixth embodiment will be described with reference to the drawings, focusing on the differences from the fifth embodiment. In this embodiment, as shown in Fig. 18 and Fig. 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, is changed.

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

[0112] The second changeover switch 245C selectively connects the low potential side 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 side path 54L, or the first end of the capacitor 246. The DC side voltage sensor 82 detects the terminal voltage of the capacitor 246.

[0113] Next, differences between the three-phase / single-phase charging control of this embodiment and the fifth embodiment will be described.

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

[0115] According to the present embodiment described above, it is possible to achieve the same effects as those of the fifth embodiment.

[0116] <Other embodiments> Each of the above embodiments may be modified as follows.

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

[0118] In the fifth and sixth embodiments, the first upper and lower arm transformer switches 241H, 241L, the first inductor 243 and the first changeover switch 245A are not limited to being provided in one set, but may be provided in multiple sets. Also, the second upper and lower arm transformer switches 242H, 242L and the second inductor 244 are not limited to being provided in one set, but may be provided in 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 FIG. 1, but may be, for example, a half-bridge circuit.

[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 configured as a parallel connection of a plurality of N-channel MOSFETs. The same applies to the first lower arm switch and the second and third upper and lower arm switches.

[0122] The switches included 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 be, for example, IGBTs with freewheel diodes connected in reverse parallel. 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 moving body on which the power conversion device is mounted is not limited to a vehicle, but may be, for example, an aircraft or a ship. The power conversion device is not limited to a moving body, but may be a stationary device.

[0124] The power conversion device is not limited to one compatible with a three-phase AC power source and AC load, but may be one compatible with a four or more phase AC power source and AC load.

[0125] The control unit and the method described in the present disclosure may be realized by a special-purpose computer provided by configuring a processor and a memory programmed to execute one or more functions embodied in a computer program. Alternatively, the control unit and the method described in the present disclosure may be realized by a special-purpose computer provided by configuring a processor with one or more dedicated hardware logic circuits. Alternatively, the control unit and the method described in the present disclosure may be realized by one or more special-purpose computers configured by a combination of a processor and a memory programmed to execute one or more functions and a processor configured with one or more hardware logic circuits. In addition, the computer program may be stored in a computer-readable non-transitory tangible recording medium as instructions executed by the computer. [Explanation of symbols]

[0126] 10...charger, 20...power factor correction circuit, 40...step-down chopper circuit, 50...DCDC converter, 45...switching switch, 100...control device.

Claims

1. a plurality of three-phase AC terminals (Tac1 to Tac3); DC terminals (TdcH, TdcL); comprising in a charger (10) 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 terminals, an AC-DC converter (20) connected to the AC terminals and configured to convert an AC voltage input from the AC terminals into a DC voltage and output the DC voltage; a step-down chopper circuit (40) connected to the output side of the AC-DC converter and configured to step down the DC voltage input from the AC-DC converter and output the stepped-down DC voltage; a DC-DC converter (50) connecting the output side of the step-down chopper circuit and the DC terminals and configured to transform the DC voltage input from the step-down chopper circuit and output the transformed DC voltage to the DC terminals; a smoothing capacitor (55); comprising the smoothing capacitor is connected to the input side of the DC-DC converter; the AC-DC converter has a high-potential side input path (25H) and a low-potential side input path (25L) that output a DC voltage; the step-down chopper circuit a series connection of an upper-arm transformer switch (41H) and a lower-arm transformer switch (41L); an inductor (42); a capacitor (43); having the DC-DC converter has a high-potential side path (54H) and a low-potential side path (54L); the high-potential side path and the low-potential side 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 switching switch (45) for selectively connecting the high-potential side path to the high-potential side terminal of the upper-arm transformer switch or the connection point of the inductor and the capacitor.

2. comprising a control device (100), the control device when it is determined that the multi-phase AC power supply is electrically connected to the AC terminals, controls the switching switch so that the high-potential side path is connected to the connection point of the inductor and the capacitor. When it is determined that the single-phase AC power supply is electrically connected to the AC terminal, the charger according to claim 1, wherein the switching 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. A plurality of phase AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL), Comprising: In a charger (10) 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, An AC-DC converter (20) connected to the AC terminal and converting an AC voltage input from the AC terminal into a DC voltage and outputting it; A buck chopper circuit (40) connected to the output side of the AC-DC converter and stepping down the DC voltage input from the AC-DC converter and outputting it; A DC-DC converter (50) connecting the output side of the buck chopper circuit and the DC terminal, transforming the DC voltage input from the buck chopper circuit and outputting it to the DC terminal; A smoothing capacitor (55); Comprising: The smoothing capacitor is connected to the input side of the DC-DC converter, The AC-DC converter has a high-potential side input path (25H) and a low-potential side input path (25L) for outputting a DC voltage, The buck chopper circuit, A series connection body of an upper-arm transformer switch (41H) and a lower-arm transformer switch (41L); An inductor (42); A capacitor (44); Having: The DC-DC converter has a high-potential side path (54H) and a low-potential side path (54L), The high-potential side path and the low-potential side 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 body 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 switching switch (46) for selectively connecting the low-potential side path to the low-potential side terminal of the lower-arm transformer switch or the connection point of the inductor and the capacitor.

4. Comprising a control device (100), The control device, When it is determined that the plurality of - phase AC power supply is electrically connected to the AC terminal, the switching switch is controlled so that the low - potential - side 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 switching switch is controlled so that the low - potential - side path is connected to the low - potential - side 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 power is transmitted between the AC terminal and the DC terminal, in order to reduce the ripple of the terminal voltage of the smoothing capacitor, the upper and lower arm transformer switches are switched and controlled. The charger according to claim 2 or 4, wherein when it is determined that the plurality of - phase AC power supply is electrically connected to the AC terminal and power is transmitted between the AC terminal and the DC terminal, the upper and lower arm transformer switches are switched and controlled to step down the DC voltage input to the buck chopper circuit and output it to the DC - DC converter.

6. A charger (10) comprising a plurality of - phase AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL), and comprising: In the charger (10) configured such that a plurality of - phase AC power supply (200) or a single - phase AC power supply (210) can be electrically connected to the AC terminal, an AC - DC converter (20) connected to the AC terminal and converting the AC voltage input from the AC terminal into a DC voltage and outputting it; a buck chopper circuit (40) connected to the output side of the AC - DC converter and stepping down the DC voltage input from the AC - DC converter and outputting it; a DC - DC converter (50) connecting the output side of the buck chopper circuit and the DC terminal and transforming the DC voltage input from the buck chopper circuit and outputting it to the DC terminal; a smoothing capacitor (55); and comprising: The smoothing capacitor is connected to the input side of the DC - DC converter. The AC - DC converter has a high - potential - side input path (25H) and a low - potential - side input path (25L) for outputting a DC voltage. The buck chopper circuit includes: a series connection body of a first upper - arm transformer switch (241H) and a first lower - arm transformer switch (241L); a series connection body of a second upper - arm transformer switch (242H) and a second lower - arm transformer switch (242L); The first inductor (243) and the second inductor (244), a capacitor (246), and having, the DC-DC converter has a high potential side path (54H) and a low potential side path (54L), the high potential side path and the low potential side 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 side terminals of the first and second lower arm transformer switches are connected to the low potential side input path, a first switching switch (245A), a second switching switch (245B), and comprising, at a first end of a series connection of the first inductor and the first switching switch, a connection point of the first upper arm transformer switch and the first lower arm transformer switch is connected, at a second end of the series connection of the first inductor and the first switching switch, a first end of the capacitor is connected, at a second end of the capacitor, the low potential side terminals of the first and second lower arm transformer switches and the low potential side path are connected, at a connection point of the second upper arm transformer switch and the second lower arm transformer switch, a first end of the capacitor is connected via a second inductor, the second switching switch selectively connects the high potential side path to the high potential side terminals of the first and second upper arm transformer switches or the first end of the capacitor, a charger.

7. Comprising a control device (100), the control device, when it is determined that the plurality of phase AC power supply is electrically connected to the AC terminal, turns on the first switching switch and controls the second switching switch so that the high potential side path is connected to the first end of the capacitor, when it is determined that the single phase AC power supply is electrically connected to the AC terminal, turns off the first switching switch and controls the second switching switch so that the high potential side path is connected to the high potential side terminals of the first and second upper arm transformer switches, the charger according to claim 6.

8. A plurality of phase AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL), and comprising, in a charger (10) configured such that a plurality of phase AC power supply (200) or a single phase AC power supply (210) can be electrically connected to the AC terminals, an AC-DC converter (20) connected to the AC terminals and converting an AC voltage input from the AC terminals into a DC voltage and outputting it, A step-down chopper circuit (40) connected to the output side of the AC-DC converter and stepping down the DC voltage input from the AC-DC converter for output; A DC-DC converter (50) connecting the output side of the step-down chopper circuit and the DC terminal, transforming the DC voltage input from the step-down chopper circuit and outputting it to the DC terminal; A smoothing capacitor (55); Comprising; The smoothing capacitor is connected to the input side of the DC-DC converter; The AC-DC converter has a high-potential side input path (25H) and a low-potential side input path (25L) for outputting a DC voltage; The step-down chopper circuit; A series connection body of a first upper-arm transformer switch (241H) and a first lower-arm transformer switch (241L); A series connection body of a second upper-arm transformer switch (242H) and a second lower-arm transformer switch (242L); A first inductor (243) and a second inductor (244); A capacitor (247); Having; The DC-DC converter has a high-potential side path (54H) and a low-potential side path (54L); The high-potential side path and the low-potential side 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 side terminals of the first and second lower-arm transformer switches are connected to the low-potential side input path; A first switching switch (245A); A second switching switch (245C); Comprising; 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 body of the first inductor and the first switching switch; The first end of the capacitor is connected to the second end of the series connection body of the first inductor and the first switching switch; The second end of the capacitor is connected to the high-potential side terminals 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 the second inductor; The second switching switch selectively connects the low-potential side path to the low-potential side terminals of the first and second lower-arm transformer switches or the first end of the capacitor, a charger.

9. Comprising a control device (100); The control device; When it is determined that the plurality of - phase AC power supply is electrically connected to the AC terminal, turn on the first switching switch and control the second switching switch so that the low - potential - side path is connected to the first terminal of the capacitor. When it is determined that the single - phase AC power supply is electrically connected to the AC terminal, turn off the first switching switch and control the second switching switch so that the low - potential - side path is connected to the low - potential - side terminals of the first and second lower - arm transformer switches. The charger according to claim 8.

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

11. In a program executed by a computer (100a) applied to a charger (10), The charger is Provided with a plurality of - phase AC terminals (Tac1 to Tac3) And DC terminals (TdcH, TdcL) And is configured such that a plurality of - phase AC power supply (200) or a single - phase AC power supply (210) can be electrically connected to the AC terminals. The charger is An AC - DC converter (20) connected to the AC terminals and converting the AC voltage input from the AC terminals into a DC voltage and outputting it; A buck - chopper circuit (40) connected to the output side of the AC - DC converter and stepping down the DC voltage input from the AC - DC converter and outputting it; A DC - DC converter (50) connecting the output side of the buck - chopper circuit and the DC terminals and transforming the DC voltage input from the buck - chopper circuit and outputting it to the DC terminals; A smoothing capacitor (55); A switching switch (45); And is provided with The AC - DC converter has a high - potential - side input path (25H) and a low - potential - side input path (25L) for outputting a DC voltage. The buck - chopper circuit is ​ A series connection of an upper-arm transformer switch (41H) and a lower-arm transformer switch (41L), an inductor (42), a capacitor (43), and having the DC-DC converter has a high-potential side path (54H) and a low-potential side path (54L), the high-potential side path and the low-potential side 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 switching switch selectively connects the high-potential side path to the high-potential side terminal of the upper-arm transformer switch or the connection point of the inductor and the capacitor, to the computer, when it is determined that the plurality of-phase AC power supply is electrically connected to the AC terminal, a process of controlling the switching switch so that the high-potential side path is connected to the connection point of the inductor and the capacitor, when it is determined that the single-phase AC power supply is electrically connected to the AC terminal, a process of controlling the switching switch so that the high-potential side terminal of the upper-arm transformer switch is connected to the high-potential side path, and a program for causing the computer to execute the process.

12. In a program executed by a computer (100a) applied to a charger (10), the charger has a plurality of-phase AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL), and is provided with the charger is configured such that a plurality of-phase AC power supply (200) or a single-phase AC power supply (210) can be electrically connected to the AC terminals, the charger an AC-DC converter (20) connected to the AC terminals and converting an AC voltage input from the AC terminals into a DC voltage and outputting the DC voltage, a step-down chopper circuit (40) connected to the output side of the AC-DC converter and stepping down the DC voltage input from the AC-DC converter and outputting the stepped-down DC voltage, a DC-DC converter (50) connecting the output side of the step-down chopper circuit and the DC terminals and transforming the DC voltage input from the step-down chopper circuit and outputting the transformed DC voltage to the DC terminals, a smoothing capacitor (55), a switching switch (46), and is provided with The AC-DC converter has a high-potential side input path (25H) and a low-potential side input path (25L) that output a DC voltage. The buck chopper circuit is a series connection of an upper-arm transformer switch (41H) and a lower-arm transformer switch (41L), an inductor (42), a capacitor (44), and has The DC-DC converter has a high-potential side path (54H) and a low-potential side path (54L). The high-potential side path and the low-potential side 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 switching switch selectively connects the low-potential side path to the low-potential side terminal of the lower-arm transformer switch or the connection point of the inductor and the capacitor. To the computer When it is determined that the multi-phase AC power supply is electrically connected to the AC terminal, a process of controlling the switching switch so that the low-potential side path is connected to the connection point of the inductor and the capacitor. When it is determined that the single-phase AC power supply is electrically connected to the AC terminal, a process of controlling the switching switch so that the low-potential side path is connected to the low-potential side terminal of the lower-arm transformer switch. A program that causes the above to be executed.

13. In a program executed by a computer (100a) applied to a charger (10), The charger has a plurality of phase AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL), and is provided 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 charger an AC-DC converter (20) connected to the AC terminal and converting the AC voltage input from the AC terminal into a DC voltage and outputting it; a buck chopper circuit (40) connected to the output side of the AC-DC converter and stepping down the DC voltage input from the AC-DC converter and outputting it. A DC-DC converter (50) that connects the output side of the step-down chopper circuit to the DC terminal, transforms the DC voltage input from the step-down chopper circuit, and outputs it to the DC terminal; A smoothing capacitor (55); A first switching switch (245A); A second switching switch (245B); and is provided with; The AC-DC converter has a high-potential side input path (25H) and a low-potential side input path (25L) that output a DC voltage; The step-down chopper circuit; A series connection of a first upper arm transformer switch (241H) and a first lower arm transformer switch (241L); A series connection of a second upper arm transformer switch (242H) and a second lower arm transformer switch (242L); A first inductor (243) and a second inductor (244); A capacitor (246); and has; The DC-DC converter has a high-potential side path (54H) and a low-potential side path (54L); The high-potential side path and the low-potential side 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 side terminals of the first and second lower arm transformer switches are connected to the low-potential side 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 switching switch; The first end of the capacitor is connected to the second end of the series connection of the first inductor and the first switching switch; The second end of the capacitor is connected to the low-potential side terminals 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 the second inductor; The second switching switch selectively connects the high-potential side path to the high-potential side terminals of the first and second upper arm transformer switches or the first end of the capacitor; When the computer; determines that the plurality of-phase AC power source is electrically connected to the AC terminal, a process of turning on the first switching switch and controlling the second switching switch so that the high-potential side path is connected to the first end of the capacitor; When it is determined that the single-phase AC power supply is electrically connected to the AC terminal, the program causes the first switching switch to be turned off and controls the second switching switch so that the high-potential side path is connected to the high-potential side terminals of the first and second upper arm transformer switches.

14. In a program executed by a computer (100a) applied to a charger (10), the charger includes a plurality of phase AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL), and 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 terminals. The charger includes an AC-DC converter (20) connected to the AC terminals and configured to convert an AC voltage input from the AC terminals into a DC voltage and output the DC voltage, a step-down chopper circuit (40) connected to the output side of the AC-DC converter and configured to step down the DC voltage input from the AC-DC converter and output the stepped-down DC voltage, a DC-DC converter (50) connecting the output side of the step-down chopper circuit and the DC terminals and configured to transform the DC voltage input from the step-down chopper circuit and output the transformed DC voltage to the DC terminals, a smoothing capacitor (55), a first switching switch (245A), and a second switching switch (245C). The AC-DC converter has a high-potential side input path (25H) and a low-potential side input path (25L) for outputting a DC voltage. The step-down chopper circuit includes a series connection of a first upper arm transformer switch (241H) and a first lower arm transformer switch (241L), a series connection of a second upper arm transformer switch (242H) and a second lower arm transformer switch (242L), a first inductor (243) and a second inductor (244), and a capacitor (247). The DC-DC converter has a high-potential side path (54H) and a low-potential side path (54L), wherein the high-potential side path and the low-potential side 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 side terminals of the first and second lower arm transformer switches are connected to the low-potential side input path, and a connection point of the first upper arm transformer switch and the first lower arm transformer switch is connected to a first end of a series connection of the first inductor and the first switching switch. ​ ​ ​ The first end of the capacitor is connected to the second end of the series connection of the first inductor and the first switching switch. The second end of the capacitor is connected to the high-potential side terminals 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 switching switch selectively connects the low-potential side path to the low-potential side terminals of the first and second lower-arm transformer switches or the first end of the capacitor. To the computer When it is determined that the plurality-phase AC power supply is electrically connected to the AC terminal, the first switching switch is turned on, and the second switching switch is controlled so that the low-potential side path is connected to the first end of the capacitor. When it is determined that the single-phase AC power supply is electrically connected to the AC terminal, the first switching switch is turned off, and the second switching switch is controlled so that the low-potential side path is connected to the low-potential side terminals of the first and second lower-arm transformer switches. A program for executing the process.

15. In a control method executed by a computer (100a) applied to a charger (10), The charger is A plurality of-phase AC terminals (Tac1 to Tac3) and DC terminals (TdcH, TdcL) And is provided with The charger is configured such that a plurality-phase AC power supply (200) or a single-phase AC power supply (210) can be electrically connected to the AC terminal. The charger is An AC-DC converter (20) connected to the AC terminal and converting the AC voltage input from the AC terminal into a DC voltage and outputting it. A buck chopper circuit (40) connected to the output side of the AC-DC converter and stepping down the DC voltage input from the AC-DC converter and outputting it. A DC-DC converter (50) connecting the output side of the buck chopper circuit and the DC terminal, transforming the DC voltage input from the buck chopper circuit, and outputting it to the DC terminal. A smoothing capacitor (55) A switching switch (45) And is provided with The AC-DC converter has a high-potential side input path (25H) and a low-potential side input path (25L) for outputting a DC voltage. The buck chopper circuit is A series connection of an upper-arm transformer switch (41H) and a lower-arm transformer switch (41L), An inductor (42) and, a capacitor (43), and having the DC-DC converter has a high-potential side path (54H) and a low-potential side path (54L), the high-potential side path and the low-potential side 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 body 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 switching switch selectively connects the high-potential side path to the high-potential side terminal of the upper arm transformer switch or the connection point of the inductor and the capacitor, to the computer, when it is determined that the plurality of-phase AC power supply is electrically connected to the AC terminal, a process of controlling the switching switch so that the high-potential side path is connected to the connection point of the inductor and the capacitor, when it is determined that the single-phase AC power supply is electrically connected to the AC terminal, a process of controlling the switching switch so that the high-potential side terminal of the upper arm transformer switch is connected to the high-potential side path, and a control method for causing the computer to execute the process.

16. In a control method executed by a computer (100a) applied to a charger (10), the charger has a plurality of-phase AC terminals (Tac1 to Tac3) and DC terminals (TdcH, TdcL), and is provided with the charger is configured such that a plurality of-phase AC power supply (200) or a single-phase AC power supply (210) can be electrically connected to the AC terminals, the charger an AC-DC converter (20) connected to the AC terminals and converting an AC voltage input from the AC terminals into a DC voltage and outputting the DC voltage, a step-down chopper circuit (40) connected to the output side of the AC-DC converter and stepping down the DC voltage input from the AC-DC converter and outputting the stepped-down DC voltage, a DC-DC converter (50) connecting the output side of the step-down chopper circuit and the DC terminals and transforming the DC voltage input from the step-down chopper circuit and outputting the transformed DC voltage to the DC terminals, a smoothing capacitor (55), a switching switch (46), and is provided with the AC-DC converter has a high-potential side input path (25H) and a low-potential side input path (25L) for outputting a DC voltage, The step-down chopper circuit is a series connection of an upper-arm transformer switch (41H) and a lower-arm transformer switch (41L), an inductor (42), a capacitor (44), and has the DC-DC converter has a high-potential side path (54H) and a low-potential side path (54L), the high-potential side path and the low-potential side 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 switching switch selectively connects the low-potential side path to the low-potential side terminal of the lower-arm transformer switch or the connection point of the inductor and the capacitor, to the computer, when it is determined that the plurality of-phase AC power supply is electrically connected to the AC terminal, a process of controlling the switching switch so that the low-potential side path is connected to the connection point of the inductor and the capacitor, when it is determined that the single-phase AC power supply is electrically connected to the AC terminal, a process of controlling the switching switch so that the low-potential side path is connected to the low-potential side terminal of the lower-arm transformer switch, and a control method for executing the process.

17. In a control method executed by a computer (100a) applied to a charger (10), the charger is a plurality of-phase AC terminals (Tac1 to Tac3), DC terminals (TdcH, TdcL), and includes the charger is configured such that a plurality of-phase AC power supply (200) or a single-phase AC power supply (210) can be electrically connected to the AC terminal, the charger is an AC-DC converter (20) connected to the AC terminal and converting an AC voltage input from the AC terminal into a DC voltage and outputting the DC voltage, a step-down chopper circuit (40) connected to the output side of the AC-DC converter and stepping down the DC voltage input from the AC-DC converter and outputting the stepped-down DC voltage, a DC-DC converter (50) connecting the output side of the step-down chopper circuit and the DC terminal and transforming the DC voltage input from the step-down chopper circuit and outputting the transformed DC voltage to the DC terminal, a smoothing capacitor (55), a first switching switch (245A), The second switching switch (245B), and is provided with the AC-DC converter has a high-potential side input path (25H) and a low-potential side input path (25L) that output a DC voltage, the buck chopper circuit a series connection body of a first upper arm conversion switch (241H) and a first lower arm conversion switch (241L), a series connection body of a second upper arm conversion switch (242H) and a second lower arm conversion switch (242L), a first inductor (243) and a second inductor (244), a capacitor (246), and has the DC-DC converter has a high-potential side path (54H) and a low-potential side path (54L), the high-potential side path and the low-potential side path are connected by the smoothing capacitor, the high-potential side terminals of the first and second upper arm conversion switches are connected to the high-potential side input path, the low-potential side terminals of the first and second lower arm conversion switches are connected to the low-potential side input path, a connection point of the first upper arm conversion switch and the first lower arm conversion switch is connected to a first end of a series connection body of the first inductor and the first switching switch, a first end of the capacitor is connected to a second end of a series connection body of the first inductor and the first switching switch, a second end of the capacitor is connected to the low-potential side terminals of the first and second lower arm conversion switches and the low-potential side path, a first end of the capacitor is connected to a connection point of the second upper arm conversion switch and the second lower arm conversion switch via the second inductor, the second switching switch selectively connects the high-potential side path to the high-potential side terminals of the first and second upper arm conversion switches or the first end of the capacitor, to the computer, when it is determined that the plurality of phase AC power supply is electrically connected to the AC terminal, a process of turning on the first switching switch and controlling the second switching switch so that the high-potential side path is connected to the first end of the capacitor, when it is determined that the single-phase AC power supply is electrically connected to the AC terminal, a process of turning off the first switching switch and controlling the second switching switch so that the high-potential side path is connected to the high-potential side terminals of the first and second upper arm conversion switches, a control method for executing. In a control method executed by a computer (100a) applied to a charger (10), the charger includes: a plurality of-phase AC terminals (Tac1 to Tac3); DC terminals (TdcH, TdcL); and is configured such that a plurality of-phase AC power supply (200) or a single-phase AC power supply (210) can be electrically connected to the AC terminals. The charger further includes: an AC-DC converter (20) connected to the AC terminals and configured to convert an AC voltage input from the AC terminals into a DC voltage and output the DC voltage; a buck chopper circuit (40) connected to an output side of the AC-DC converter and configured to step down the DC voltage input from the AC-DC converter and output the stepped-down DC voltage; a DC-DC converter (50) connecting an output side of the buck chopper circuit and the DC terminals and configured to transform the DC voltage input from the buck chopper circuit and output the transformed DC voltage to the DC terminals; a smoothing capacitor (55); a first switching switch (245A); and a second switching switch (245C). The AC-DC converter has a high-potential side input path (25H) and a low-potential side input path (25L) for outputting a DC voltage. The buck chopper circuit includes: a series connection of a first upper arm transformer switch (241H) and a first lower arm transformer switch (241L); a series connection of a second upper arm transformer switch (242H) and a second lower arm transformer switch (242L); a first inductor (243) and a second inductor (244); and a capacitor (247). The DC-DC converter has a high-potential side path (54H) and a low-potential side path (54L). The high-potential side path and the low-potential side path are connected by the smoothing capacitor. High-potential side terminals of the first and second upper arm transformer switches are connected to the high-potential side input path. Low-potential side terminals of the first and second lower arm transformer switches are connected to the low-potential side input path. A connection point of the first upper arm transformer switch and the first lower arm transformer switch is connected to a first end of a series connection of the first inductor and the first switching switch. A first end of the capacitor is connected to a second end of the series connection of the first inductor and the first switching switch. A second end of the capacitor is connected to the high-potential side terminals 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 commutation switch and the second lower arm commutation switch via a second inductor. The second switching switch selectively connects the low potential side path to the low potential side terminals of the first and second lower arm commutation switches or the first end of the capacitor. to the computer When it is determined that the multi-phase AC power supply is electrically connected to the AC terminal, a process of turning on the first switching switch and controlling the second switching switch so that the low potential side path is connected to the first end of the capacitor; When it is determined that the single-phase AC power supply is electrically connected to the AC terminal, a process of turning off the first switching switch and controlling the second switching switch so that the low potential side path is connected to the low potential side terminals of the first and second lower arm commutation switches, A control method for executing.

Images