JP2012085378A - Resonant charging apparatus and vehicle using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resonant charging apparatus and a vehicle mounted therewith which can charge a secondary battery mounted on the vehicle from an AC power supply with high efficiency.SOLUTION: A resonant charging apparatus 1 is connected between an AC power supply 5 and a secondary battery 6 mounted on the vehicle to supply power from the AC power supply 5 to the secondary battery 6. The resonant charging apparatus 1 includes an AC-DC converter 2 for receiving power from the AC power supply 5 to output a DC link voltage, a DC-DC converter 3 for supplying power from the link voltage to the secondary battery 6 while insulating it, and control means 4 for controlling the converters. The DC-DC converter 3 includes a switching circuit with the link voltage connected between DC terminals to output a rectangular voltage between AC terminals, and the control means 4 controls switching elements of the switching circuit to change the frequency of the rectangular voltage.

Description

  The present invention relates to a resonance type charging device for charging a secondary battery and a vehicle equipped with the same.

  In recent years, high-efficiency hybrid vehicles have been popularized due to increasing awareness of global environmental conservation. The hybrid vehicle has a secondary battery for driving the traveling motor. If this secondary battery is charged from a commercial AC power source, the fuel efficiency of the hybrid vehicle can be improved. In order to safely charge a secondary battery from a commercial power source with less power, an conversion type DC-DC converter with high conversion efficiency is required. Patent Document 1 is disclosed as an insulated DC-DC converter that aims to improve conversion efficiency by reducing the withstand voltage of a rectifier diode.

  On the other hand, Patent Document 2 discloses a power supply device that aims at high-efficiency operation in a wide current range in a power supply device in which a resonant converter is connected to a subsequent stage of a power factor correction converter.

Japanese Patent No. 4013995 JP 2005-65395 A

  Generally, in order to increase the efficiency of an insulated DC-DC converter, it is effective to reduce the withstand voltage of a diode that rectifies the voltage current of the transformer secondary winding. However, in the conventional DC-DC converter disclosed in Patent Document 1, in order to obtain a high output voltage for charging a secondary battery for driving a traveling motor, it is necessary to increase the withstand voltage of the diode, and to achieve high efficiency. It has become an obstacle to conversion. In addition, the conventional power supply device disclosed in Patent Document 2 achieves high efficiency in a wide load current range, but does not achieve high efficiency in a wide output voltage range.

  An object of the present invention is to provide a resonance type charging device and a vehicle that can charge a secondary battery for driving a traveling motor having a high voltage and a wide voltage range from an AC power source with high efficiency.

  In order to achieve the above object, a resonance type charging apparatus according to the present invention is connected between an AC power source and a secondary battery mounted on a vehicle, and resonates to supply power from the AC power source to the secondary battery. An AC-DC converter connected to the AC power source and outputting power from the AC power source and outputting a DC link voltage; and supplying power while insulating the link voltage from the link voltage to the secondary battery. A DC-DC converter; and a control means for controlling the AC-DC converter and the DC-DC converter. The DC-DC converter has a rectangular shape between the AC terminals with the link voltage connected between the DC terminals. Between the switching circuit that outputs the wave voltage and the DC terminal to which the secondary battery and the smoothing capacitor are connected in parallel, the current input from between the AC terminals is rectified and output. A current circuit, a primary winding connected between the AC terminals of the switching circuit, a secondary winding connected between the AC terminals of the rectifier circuit, the primary winding and the secondary winding, And a resonant capacitor and a resonant inductor connected in series with the primary winding and / or the secondary winding, and the control means has a frequency of the rectangular wave voltage. The switching element provided in the switching circuit is controlled so as to change the voltage.

  Further, the vehicle according to the present invention is connected between a connector connected to an AC power source, a power motor, a secondary battery that supplies power to the power motor, and the connector and the secondary battery, A resonance-type charging device that supplies power from the AC power source connected to the connector to the secondary battery, and the resonance-type charging device inputs power from the AC power source and outputs a DC link voltage. An AC-DC converter, a DC-DC converter that supplies power while being insulated from the link voltage to the secondary battery, and a control unit that controls the AC-DC converter and the DC-DC converter, The DC-DC converter includes a switching circuit in which the link voltage is connected between direct current terminals and a rectangular wave voltage is output between alternating current terminals, the secondary battery, and a smoothing capacitor. A rectifier circuit that rectifies and outputs current input between AC terminals between DC terminals connected in a row, a primary winding connected between AC terminals of the switching circuit, and an AC terminal of the rectifier circuit A secondary winding connected in between, a transformer for magnetically coupling the primary winding and the secondary winding, and a resonant capacitor connected in series with the primary winding and / or the secondary winding And a resonant converter comprising a resonant inductor, wherein the control means controls a switching element provided in the switching circuit so as to change a frequency of the rectangular wave voltage.

  ADVANTAGE OF THE INVENTION According to this invention, the resonance type charging device and vehicle which can charge the secondary battery with a high voltage and a wide voltage range from AC power supply with high efficiency can be provided.

1 is a circuit configuration diagram of a resonance type charging device 1 of Embodiment 1. FIG. FIG. 3 is a diagram illustrating a circuit operation of the AC-DC converter 2 according to the first embodiment. FIG. 3 is a diagram illustrating a circuit operation of the DC-DC converter 3 according to the first embodiment. FIG. 3 is a diagram illustrating characteristics of the DC-DC converter 3 according to the first embodiment. FIG. 3 is a diagram illustrating a charging operation of the resonance type charging device 1 according to the first embodiment. FIG. 3 is a diagram illustrating a charging operation of the resonance type charging device 1 according to the first embodiment. FIG. 3 is a diagram illustrating a charging operation of the resonance type charging device 1 according to the first embodiment. FIG. 3 is a diagram for explaining the characteristics of the resonance type charging device 1 according to the first embodiment. The figure explaining how to determine the link voltage of the resonance type charging device 1 of the first embodiment. The circuit block diagram of the resonance type charging device 11 by Example 2 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the electric vehicle power supply system which employ | adopted the resonance type charging device of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a circuit configuration diagram of a resonance type charging device 1 according to a first embodiment of the present invention. The resonance type charging device 1 is connected between an AC power source 5 and a secondary battery 6 mounted on a vehicle, and supplies power from the AC power source 5 to the secondary battery 6. A commercial power supply can be used as the AC power supply 5. Stable power can be supplied by using a commercial power source, and fuel consumption can be improved. However, the power source is not limited to a commercial power source, and for example, a power generation device such as solar power generation or wind power generation, or a general generator may be used.

  The resonance type charging device 1 includes an AC-DC converter 2 that inputs power from an AC power supply 5 and outputs a DC link voltage, and a DC-DC converter that supplies power while being insulated from the link voltage to the secondary battery 6. 3 and control means 4 for controlling these converters.

  In the AC-DC converter 2, the voltage of the AC power supply 5 is full-wave rectified by bridge-connected rectifier diodes D <b> 11 to D <b> 14. In this embodiment, the rectifier diodes D11 and D12 and the rectifier diodes D13 and D14 are connected in series, and each of them is connected in parallel to form a bridge connection, and the connection between the rectifier diodes D11 and D12 connected in series. The connection point between the rectifier diodes D13 and D14 connected in series with the point is an AC terminal, and the connection points of both ends of the rectifier diodes D11 and D12 connected in series and the rectifier diodes D13 and D14 connected in series are It is a DC terminal. The AC power source 5 is connected to this AC terminal.

  This full-wave rectified voltage is input to a step-up chopper circuit constituted by a smoothing inductor L1 connected to a DC terminal, a step-up switching element Q10, a step-up diode D10, and a link capacitor C1. A link voltage is set between both ends of the link capacitor C1. The control means 4 includes power factor correction control for controlling the input current from the AC power supply 5 in a sine wave shape substantially similar to the voltage of the AC power supply 5, and a link voltage for increasing the link voltage as the voltage of the secondary battery 6 increases. With coordinated control.

  The DC-DC converter 3 includes a winding N1 in which a resonance capacitor Cr1 and a resonance inductor Lr1 are connected in series, and a transformer T1 that magnetically couples the winding N2. The switching elements Q1 to Q4 include a first switching leg in which a switching element Q1 as a first switching element, a switching element Q2 as a second switching element are connected in series, and a switching element Q3 as a third switching element. The second switching leg in which the switching element Q4 as the fourth switching element is connected in series is connected in parallel to form a full bridge connection. And between both ends of the first switching leg is a DC terminal, and between the series connection point of the switching elements Q1, Q2 and the series connection point of the switching elements Q3, Q4 is an AC terminal.

  The rectangular wave voltage generated from the link voltage input from the DC terminals is applied to the series connection body of the resonance capacitor Cr1, the resonance inductor Lr1, and the winding N1 between the AC terminals by the full-bridge connected switching elements Q1 to Q4. Then, a resonance current is passed through the winding N1, and the current induced in the winding N2 is rectified by the bridge-connected diodes D21 to D24 to charge the smoothing capacitor C2 and the secondary battery 6. The rectifier circuit including the diodes D21 to D24 includes a diode D21 that is a first diode, a diode D22 that is a second diode connected in series, a diode D23 that is a third diode, A second diode leg in which a diode D24, which is a fourth diode, is connected in series is connected in parallel. Then, the smoothing capacitor C2 and the secondary battery 6 are connected with both ends of the first diode leg between the DC terminals. The winding N2 is connected between the series connection point of the diodes D21 and D22 and the series connection point of the diodes D23 and D24 between the AC terminals.

  In the present embodiment, the resonant capacitor Cr1 and the resonant inductor Lr1 are provided in the primary winding N1, but may be provided in the secondary winding N2 in consideration of circuit design conditions and restrictions. You may provide in both the coil | winding N1 and the secondary winding N2.

  Antiparallel diodes D1 to D4 are connected to switching elements Q1 to Q4, respectively. Here, when a MOSFET is used as the switching elements Q1 to Q4, a parasitic diode of the MOSFET can be used as the antiparallel diodes D1 to D4. Thus, by having antiparallel diodes D1-D4, it becomes possible to form a favorable resonance type charging device.

  The step-up switching element Q10 and the switching elements Q1 to Q4 are controlled by the control means 4. The control means 4 includes a voltage sensor 21 that detects an input voltage, a voltage sensor 22 that detects a link voltage, a voltage sensor 23 that detects a voltage of the secondary battery, that is, an output voltage, and an input current from the AC power supply 5. A current sensor 24 to detect and a current sensor 25 to detect an output current to the secondary battery are connected.

  The circuit operation of the AC-DC converter 2 will be described with reference to FIG. Here, a case where the voltage of the AC power supply 5 has one polarity will be described. The operation when the voltage of the AC power supply 5 has a reverse polarity can be easily inferred. 2A and 2B show circuit operations in modes a and b, respectively.

(Mode a)
In mode a, step-up switching element Q10 is on. The voltage of the AC power supply 5 is applied to the smoothing inductor L1, and the energy of the AC power supply 5 is accumulated in the smoothing inductor L1.

(Mode b)
When the boost switching element Q10 is turned off, the mode b is entered. In mode b, the energy stored in the smoothing inductor L1 is released to the link capacitor C1 via the boost diode D10.

  Thereafter, mode a and mode b are repeated.

  Next, the circuit operation of the DC-DC converter 3 will be described with reference to FIG. Here, FIGS. 3A to 3D show circuit operations in modes A to D, respectively.

(Mode A)
In mode A, switching elements Q1, Q4 are in the on state. A resonance current from the link capacitor C1 by the resonance capacitor Cr1 and the resonance inductor Lr1 flows through the winding N1. The current induced in the winding N2 flows to the output via the diodes D21 and D24.

(Mode B)
When the electric charge is accumulated in the resonance capacitor Cr1 and the resonance current by the resonance capacitor Cr1 and the resonance inductor Lr1 finishes flowing, the mode B is entered. In mode B, the exciting current of the transformer T1 flows through the winding N1. The voltage of the winding N2 is lower than the voltage of the output smoothing capacitor C2, and no current flows through the winding N2. In mode A, if switching elements Q1 and Q4 are turned off before the resonance current ends, mode B may be omitted.

(Mode C)
When switching elements Q1 and Q4 are turned off, the mode C is entered. In mode C, the current flowing through the switching elements Q1, Q4 flows through the antiparallel diodes D2, D3 and flows to the link capacitor C1. At this time, the switching elements Q2 and Q3 are turned on.

(Mode D)
When the current of the winding N1 is reversed, the mode D is entered. This mode D is a symmetrical operation of mode A. Thereafter, the mode A is returned to the mode A after the symmetrical operation of the modes B and C.

  Thus, in this resonance type charging device 1, the DC-DC converter 3 is a resonance type converter, and the voltage applied to the diodes D21 to D24 is clamped by the voltage of the output smoothing capacitor C2. Therefore, even when the voltage of the secondary battery 6 is high, a diode having a relatively low withstand voltage and a low forward voltage drop can be used as the diodes D21 to D24. Therefore, loss can be reduced, which is advantageous for high efficiency. is there.

  An LC filter composed of an inductor and a capacitor may be inserted between the smoothing capacitor C2 that is the output terminal of the DC-DC converter 3 and the secondary battery 6 in order to reduce ripple current. However, the DC-DC converter 3 is connected to the secondary battery 6 without inserting a converter having a current control function such as a chopper circuit in the subsequent stage. Therefore, the control means 4 has a function of performing constant voltage constant current control on the output of the DC-DC converter 3 in order to charge a secondary battery whose voltage changes depending on the state of charge. Since the DC-DC converter 3 is a resonance type converter, the output is controlled by controlling the switching frequency of the switching elements Q1 to Q4.

  When charging a secondary battery of a vehicle from a commercial power source, there is generally a limit to the current and power that can be supplied by the commercial power source. The control means 4 controls the current and power input from the AC power source 5 to set values when the voltage of the secondary battery 6 is lower than the voltage at which charging is finished so that the secondary battery 6 can be charged in a short time. It has a function to do. In this case, the output power of the DC-DC converter 3 is maintained substantially constant.

  FIG. 4 shows the relationship between the switching frequency fsw, the output power Pout, the output voltage Vout, and the output current Iout when the link voltage is constant. When the link voltage and the output power are kept constant, the switching frequency is high when the output voltage is low and the output current is large, and conversely, when the output voltage is high and the output current is small, the switching frequency is low. Resonant converters often have low efficiency when the switching frequency is too high or too low, and it is desirable to operate at an intermediate switching frequency with high efficiency.

  5 to 7 show changes in the output voltage Vout, the link voltage Vlink, the output power Pout, the output current Iout, the switching frequency fsw, and the efficiency η during charging of the secondary battery 6 with time Time.

  In FIG. 5, the link voltage Vlink is maintained at a relatively low value. The output voltage Vout increases with time, and the switching frequency fsw becomes too low, so the efficiency η is decreased.

  In FIG. 6, the link voltage Vlink is maintained at a relatively high value. Since the output voltage Vout is low and the switching frequency fsw is too high in the period close to the start of charging, the efficiency η is low.

  The resonant charging device 1 includes link voltage cooperative control for controlling the link voltage by the voltage of the secondary battery 6. In FIG. 7, in order to maintain the switching frequency fsw so as to increase the efficiency, the link voltage Vlink is increased with the increase of the output voltage Vout.

  FIG. 8 shows a method for determining the link voltage Vlink from the output voltage Vout. What is necessary is just to determine link voltage Vlink so that efficiency (eta) may become high in each condition of output voltage Vout.

  However, since the circuit configuration of the AC-DC converter 2 is a step-up chopper as described above, the link voltage cannot be made smaller than the amplitude of the voltage of the AC power supply 5. Therefore, the variable range of the link voltage in the link voltage cooperative control is approximately the lower limit of the amplitude of the voltage of the AC power supply 5. In some cases, an upper limit is set in the variable range of the link voltage from the viewpoint of the withstand voltage and life of circuit components such as the link capacitor C1. FIG. 9 illustrates the relationship between the output voltage Vout and the link voltage Vlink. However, VlinkC represents a link voltage at which efficiency increases, VlinkH represents an upper limit of the link voltage, and VlinkL represents a lower limit of the link voltage.

  Of course, the efficiency improvement effect can be obtained even if the link voltage cooperative control is simply performed by a method such as reducing the link voltage when the voltage of the AC power supply 5 and the voltage of the secondary battery 6 are both low. .

  As described above, the resonance type charging device 1 employs a resonance type converter as a circuit system of the DC-DC converter 3, and charges the secondary battery 6 with high efficiency by performing constant voltage and constant current control. be able to. Furthermore, link voltage coordinated control is provided in order to maximize the high efficiency of the resonant converter.

  FIG. 10 is a circuit configuration diagram of the resonant charging device 11 according to the second embodiment of the present invention. Similar to the resonance type charging device 1 of the first embodiment, the resonance type charging device 11 supplies power from the AC power source 5 to the secondary battery 6.

  The resonance type charging device 11 includes an AC-DC converter 12 that receives power from an AC power supply 5 and outputs a DC link voltage, and a DC-DC converter that supplies power while being insulated from the link voltage to the secondary battery 6. 13 and control means 14 for controlling these converters.

  In the AC-DC converter 12, the step-up chopper circuit configured in the AC-DC converter 2 of the first embodiment includes a smoothing inductor L2, a step-down switching element Q5, a step-down diode D5, a step-up switching element Q6, and a step-up diode. The difference is that it is an H-bridge circuit constituted by D6 and a link capacitor C1. In addition, an LC filter composed of a filter inductor L3 and a filter capacitor C3 is provided.

  A filter inductor L3 and a filter capacitor C3 are connected between the DC terminals of the rectifier diodes D11 to D14 that are bridge-connected. A step-down switching element Q5 and a step-down diode D5 are connected in series between both ends of the filter capacitor C3, and a smoothing inductor L2 and a step-up switching element Q6 are connected in series between both ends of the step-down diode D5. Further, a boost diode D6 and a link capacitor C1 are connected in series between both ends of the boost switching element Q6.

  Compared with the DC-DC converter 3 of the first embodiment, the DC-DC converter 13 includes resonant capacitors Cr11 and Cr12 as resonance capacitors Cr1 and Cr12, and includes switching elements Q1 to Q4 including anti-parallel diodes D1 to D4 connected in a full bridge. The switching elements Q3 and Q4 and the antiparallel diodes D3 and D4 are replaced with resonant capacitors Cr11 and Cr12, and the diodes D23 and D24 out of the bridge-connected diodes D21 to D24 are smoothed, respectively. The difference is that the capacitors C21 and C22 are replaced.

  That is, the switching circuit in the DC-DC converter 13 includes a first switching leg in which a switching element Q1 that is a first switching element and a switching element Q2 that is a second switching element are connected in series, and a first resonance capacitor. A certain resonance capacitor Cr11 and a resonance capacitor leg in which a resonance capacitor Cr12 as a second resonance capacitor are connected in series are connected in parallel. In this switching circuit, both ends of the first switching leg are between the DC terminals, and between the series connection point of the switching elements Q1 and Q2 and the series connection point of the resonance capacitors Cr11 and Cr12 are between the AC terminals.

  Further, the rectifier circuit in the DC-DC converter 13 includes a diode D21 that is a first diode, a diode D22 that is a second diode, and a smoothing capacitor that is a first voltage dividing capacitor. A voltage dividing capacitor leg in which C21 and a smoothing capacitor C22 as a second voltage dividing capacitor are connected in series is connected in parallel. In this rectifier circuit, both ends of the first diode leg are between the DC terminals, and between the series connection point of the diodes D21 and D22 and the series connection point of the smoothing capacitors C21 and C22 are between the AC terminals.

  The step-down switching element Q5, the step-up switching element Q6, and the switching elements Q1, Q2 are controlled by the control means 14. Similarly to the resonance type charging device 1 of the first embodiment, voltage sensors 21 to 23 and current sensors 24 and 25 are connected to the control unit 14. The control means 14 includes power factor correction control, link voltage cooperative control, constant voltage constant current control, and the like, as with the control means 4 of the first embodiment.

  The resonant charging device 11 employs an H-bridge circuit for the AC-DC converter 12 as described above, and the link voltage can be made smaller than the amplitude of the voltage of the AC power supply 5 by switching the step-down switching element Q5. it can. Therefore, the variable range of the link voltage can be made wider than that of the resonance type charging device 1 of the first embodiment, and the secondary battery 6 can be charged with higher efficiency. Moreover, the half bridge circuit is employ | adopted for the DC-DC converter 13, and the number of parts of a switching element and a diode can be reduced.

  FIG. 11 is a schematic configuration diagram of a power supply system of an electric vehicle 110 that employs the resonance type charging device 1 according to the present invention. The resonant charging apparatus 1 is connected to a secondary battery 105 to which a plug-in charging connector 108 connected to an AC power source 109 and a DC-DC converter 102 that supplies power to an inverter 103 that drives a power motor 104 are connected. Yes. In addition, the secondary battery 105 is connected to the DC-DC converter 100 that supplies power to the auxiliary battery 106 to which the electrical equipment 101 is connected, and an external direct current power source such as a quick charger to charge the secondary battery 105. A quick charge connector 107 is connected.

  The resonant charging device 1 charges the secondary battery 105 using the power of the AC power supply 109 connected to the plug-in charging connector 108.

  According to the third embodiment, by using the resonance type charging device 1 according to the present invention, the power secondary battery mounted on the vehicle can be charged with high efficiency from the commercial power source. Of course, the resonant charging device 1 according to the present invention can also be applied to a hybrid vehicle.

DESCRIPTION OF SYMBOLS 1,11 Resonance type charging device 2,12 AC-DC converter 3,13,100,102 DC-DC converter 4,14 Control means 5,109 AC power source 6,105 Secondary battery 21-23 Voltage sensor 24,25 Current Sensor 101 Electrical equipment 103 Inverter 104 Motor for motor 106 Auxiliary battery 107 Rapid charging connector 108 Plug-in charging connector 110 Electric vehicle L1, L2 Smoothing inductor L3 Filter inductor Lr1 Resonant inductor C1 Link capacitor C2, C21, C22 Smoothing capacitor C3 Filter capacitor Cr1, Cr11, Cr12 Resonant capacitor T1 Transformer N1, N2 Winding Q1-Q4 Switching element Q5 Step-down switching element Q6, Q10 Step-up switching element D1-D4 Reverse parallel diode D5 Step-down die Over de D6, D10 boost diode D11~D14 rectifier diode D21~D24 diode

Claims (13)

In a resonance type charging device connected between an AC power source and a secondary battery mounted on a vehicle and supplying power from the AC power source to the secondary battery,
An AC-DC converter that is connected to the AC power supply, inputs power from the AC power supply, and outputs a DC link voltage; and a DC-DC converter that supplies power while being insulated from the link voltage to the secondary battery; Control means for controlling the AC-DC converter and the DC-DC converter,
In the DC-DC converter, an AC is connected between a switching circuit in which the link voltage is connected between DC terminals and a rectangular wave voltage is output between AC terminals, and a DC terminal in which the secondary battery and the smoothing capacitor are connected in parallel. A rectifier circuit that rectifies and outputs a current input between terminals, a primary winding connected between AC terminals of the switching circuit, and a secondary winding connected between AC terminals of the rectifier circuit; A resonant converter comprising: a transformer for magnetically coupling the primary winding and the secondary winding; and a resonant capacitor and a resonant inductor connected in series with the primary winding and / or the secondary winding. age,
The resonance type charging apparatus, wherein the control means controls a switching element provided in the switching circuit so as to change a frequency of the rectangular wave voltage.   2. The control unit according to claim 1, wherein the control means includes power factor correction control for controlling the current of the AC power supply in a sine wave shape, and link voltage cooperative control for increasing the link voltage as the voltage of the secondary battery increases. A resonance-type charging device characterized by that.   3. The resonance type charging device according to claim 2, wherein the control means provides an upper limit value and / or a lower limit value in a variable range of the link voltage.   4. The AC-DC converter according to claim 1, wherein the AC-DC converter includes a bridge-connected first to fourth rectifier diode, a smoothing inductor and a step-up switching element connected in series between the bridge-connected DC terminals. A boost diode and a link capacitor connected in series between both ends of the boost switching element, connecting the AC power source between the AC terminals of the bridge connection, and using the link voltage between the both ends of the link capacitor A resonance type charging device.   4. The AC-DC converter according to claim 1, wherein the AC-DC converter includes bridge-connected first to fourth rectifier diodes, a filter inductor and a filter capacitor connected in series between the DC terminals of the bridge connection, A step-down switching element and a step-down diode connected in series between both ends of the filter capacitor, a smoothing inductor and a step-up switching element connected in series between both ends of the step-down diode, and a series connection between both ends of the step-up switching element A resonance type charging apparatus comprising: a step-up diode and a link capacitor; wherein the AC power source is connected between the bridge-connected AC terminals, and the link voltage is set between both ends of the link capacitor.   6. The rectifier circuit according to claim 1, wherein the rectifier circuit includes a first diode leg in which a first diode and a second diode are connected in series, a third diode and a fourth diode, and the first diode. A second diode leg connected in parallel to the diode leg, the DC diode between both ends of the first diode leg, the series connection point of the first and second diodes, and the third and fourth A resonance-type charging device characterized in that a space between the series connection points of the diodes is between AC terminals.   6. The rectifier circuit according to claim 1, wherein the rectifier circuit includes a first diode leg in which first and second diodes are connected in series, a first and second voltage dividing capacitor, and the first rectifier circuit is connected in series. A voltage dividing capacitor leg connected in parallel to the first diode leg, and between both ends of the first diode leg as a direct current terminal, the series connection point of the first and second diodes and the first and first diode legs. A resonance-type charging device characterized in that between the series connection points of the two voltage dividing capacitors is between AC terminals.   The switching circuit according to any one of claims 1 to 7, wherein the switching circuit includes a first switching leg in which first and second switching elements are connected in series, a third switching element and a fourth switching element, and the first switching leg. A second switching leg connected in parallel to the first switching leg, and a direct current terminal between both ends of the first switching leg, and a series connection point of the first and second switching elements and the third switching leg. A resonance type charging device characterized in that a portion between the series connection points of the fourth switching elements is between AC terminals.   8. The switching circuit according to claim 1, wherein the switching circuit includes a first switching leg in which first and second switching elements are connected in series, a first and a second resonant capacitor, and the first switching leg. A resonance capacitor leg connected in parallel to the first switching leg, the DC switching terminal being between both ends of the first switching leg, the series connection point of the first and second switching elements and the first and first switching legs. A resonance type charging apparatus, characterized in that an AC terminal is provided between two resonance capacitors connected in series.   9. The resonant charging apparatus according to claim 8, further comprising an antiparallel diode connected in antiparallel to each of the first to fourth switching elements.   10. The resonance type charging device according to claim 9, further comprising an anti-parallel diode connected in anti-parallel to each of the first and second switching elements.   12. The resonance type charging apparatus according to claim 1, wherein the control means performs constant voltage constant current control on the output of the DC-DC converter. A connector connected to an AC power source, a power motor, a secondary battery for supplying power to the power motor, and the AC power source connected between the connector and the secondary battery and connected to the connector A resonance type charging device for supplying power to the secondary battery from,
The resonant charging apparatus includes an AC-DC converter that inputs power from the AC power source and outputs a DC link voltage, and a DC-DC converter that supplies power while being insulated from the link voltage to the secondary battery. Control means for controlling the AC-DC converter and the DC-DC converter,
In the DC-DC converter, an AC is connected between a switching circuit in which the link voltage is connected between DC terminals and a rectangular wave voltage is output between AC terminals, and a DC terminal in which the secondary battery and the smoothing capacitor are connected in parallel. A rectifier circuit that rectifies and outputs a current input between terminals, a primary winding connected between AC terminals of the switching circuit, and a secondary winding connected between AC terminals of the rectifier circuit; A resonant converter comprising: a transformer for magnetically coupling the primary winding and the secondary winding; and a resonant capacitor and a resonant inductor connected in series with the primary winding and / or the secondary winding. age,
The vehicle characterized in that the control means controls a switching element provided in the switching circuit so as to change a frequency of the rectangular wave voltage.

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