JPH08214413A - Charging apparatus for automobile - Google Patents

Abstract

PURPOSE: To provide a small-sized charging apparatus also having simple circuit constitution and being used for an automobile. CONSTITUTION: A secondary-side induction connector 22 is mounted at a place capable of being connected to a primary-side induction connector 21, and induced electromotive force is generated by an AC current flowing through the primary- side induction connector 21. An inverter 12 consists of transistors Tua-Tuc, Tda-Tdc for converting the DC power supply of a battery 10 into a three-phase AC power supply and diodes Dua-Duc, Dda-Ddc. Changeover switches 13-15 are fitted between an induction motor 16 and the inverter 12, supplies the induction motor with the three-phase AC power supply from the inverter 12 at the time of non-charge, and are changed over and feeds the battery 10 with induced electromotive force generated in the secondary-side induction connector 22 through a rectifier circuit formed of the two-phase section diodes Tua, Tub, Tda, Tdb of the inverter 12 as charging voltage at the time of charge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle charger, and more particularly to a charger using an inductive connector.

[0002]

2. Description of the Related Art In recent years, electric vehicles have been attracting attention, and accordingly, more efficient charging devices have been demanded. There are two types of electric vehicles, an on-vehicle type equipped with a charging device and a non-on-vehicle type not mounted on a vehicle.

The on-vehicle electric vehicle can be charged anywhere as long as it has a power source. However, since the vehicle is equipped with a charging device, the weight of the vehicle increases accordingly, which is disadvantageous in terms of drivability. Moreover, there is a problem that the power consumption of the battery increases and the traveling distance becomes short. Moreover, the charging device to be mounted requires various voltage controls in order to fully charge the battery (full charge), and the charging device becomes expensive. As a result, there is a problem in that the price of the charging device is less than that of the electric vehicle.

In this respect, the non-vehicle type electric vehicle has the advantages that it is light in weight because it is not equipped with a charging device, is excellent in driver stability, reduces the power consumption of the battery, and extends the mileage. Moreover, the non-vehicle type electric vehicle is inexpensive because the charging device is not mounted. Then, in this type of charging device, a connector extending from the charging device installed outdoors is connected to a connector provided on the vehicle, and a DC power from the charging device is supplied to the battery. This connector is a contact type connector, and DC power is supplied to the battery when the respective connection terminals come into contact with each other.

By the way, when both connectors are not connected to each other, the connection terminals of both connectors are exposed. As a result, when charging, it is necessary to be careful not to touch other members etc. to prevent electric leakage or short circuit, and handle them with extreme caution. Further, if the connectors are removed during charging, discharge occurs between the connection terminals, and the discharge damages the connection terminals. Furthermore, since the connection terminals of both connectors are exposed to the outside air when not in use, there arises a problem that the connection terminals are corroded by rain or the like, and management for that is very troublesome.

Therefore, a non-contact type charging device using an inductive connector is disclosed in JP-A-5-258962 and JP-A-5-26.
0671, JP-A-6-14470 and the like.
This non-contact type charging device uses a primary side induction connector including a primary winding and a secondary side induction connector including a secondary winding. The secondary induction connector is attached to the charging device on the vehicle side, the primary induction connector is connected to the secondary induction connector, and AC power is taken into the vehicle side using electromagnetic induction. Then, the AC power source generated in the secondary winding of the secondary side induction connector is converted into a DC voltage on the vehicle side to charge the battery.

The windings corresponding to the connection terminals of the contact type connector are covered with an insulating material without the need for electrical connection with each other. Therefore, its handling is very easy and maintenance is easy.

[0008]

By the way, in the non-contact type charging device, the secondary side induction connector is attached to the vehicle side, and the AC power source generated in the secondary winding is converted into the DC voltage. The conversion circuit is converted into a DC voltage by a rectification circuit composed of a diode. Therefore, it is much smaller and simpler in circuit configuration and cheaper than the one equipped with a charging device, but a rectifier circuit including a diode and a smoothing capacitor must be provided on the vehicle side.
It was large, complicated, and expensive.

Further, considering the heat radiation structure for the heat generated by the diode provided in the rectifying circuit during charging, the device becomes larger. The present invention has been made to solve the above problems, and an object of the present invention is to provide a vehicle charger having a smaller size and a simple circuit configuration.

[0010]

In order to achieve the above object, the invention of claim 1 is provided at a position connectable to a primary side induction connector and is induced by an alternating current flowing through the primary side induction connector. A secondary induction connector for generating electric power, an induction motor driven by a three-phase AC power supply, six switching elements for converting a DC power supply of a battery provided in a vehicle into a three-phase AC power supply, and It is provided between the induction motor and the inverter, which is composed of a diode connected in parallel to the switching element, and supplies three-phase AC power from the inverter to the induction motor when not charging, and the secondary side when charging. A switching switch for supplying the induction electromotive force generated in the induction connector to the battery as a charging voltage through a rectifier circuit formed by diodes for two phases of the inverter. The automobile charging device comprising a as its gist.

According to a second aspect of the invention, in the vehicle charging device according to the first aspect, the inverter and the changeover switch are
The secondary induction connector is provided in the same housing, the secondary induction connector is provided at a position separated from the housing, and the secondary induction connector and the changeover switch are connected by a lead wire.

According to a third aspect of the present invention, in the vehicle charging device according to the first or second aspect, a sensor for detecting whether or not the primary side induction connector is connected to the secondary side induction connector, and the sensor is the primary side. And a controller for switching the changeover switch to the charging side when the connection of the induction connector is detected.

[0013]

According to the invention of claim 1, at the time of charging, the inverter and the secondary side induction connector are connected via the changeover switch. Then, the rectifier circuit is formed by the existing diode provided in the inverter for driving the induction motor. The rectifier circuit rectifies the induced electromotive force generated in the secondary side connector by the alternating current flowing in the primary side induction connector and supplies it to the battery as a charging voltage. As a result, it is not necessary to provide a new rectifier circuit for charging. Further, since the power supplied to the rectifier circuit is induced by electromagnetic induction and the secondary side induction connector is not in electrical contact with the primary side connector, it is easy to handle.

According to the second aspect of the present invention, the secondary side induction connector is provided at a position separated from the housing. As a result, the heat generated by the secondary side induction connector during charging is not transferred to the housing.

According to the third aspect of the invention, when the sensor detects that the primary induction connector is connected to the secondary induction connector, the controller switches the changeover switch to the charging side. As a result, when the battery is charged, it can be automatically switched without switching the switch.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an automobile charging device embodying the present invention will be described below with reference to FIGS. FIG. 1 shows an electric circuit of the traveling control device and an electric circuit of the charging device. A battery 10 mounted on an automobile is connected to an inverter 12 via a smoothing capacitor 11. The inverter 12 is connected to a traveling three-phase induction motor 16 via three changeover switches 13 to 15.

The inverter 12 has three upper arm NPs.
It is composed of N transistors Tua to Tuc and three lower arm NPN transistors Tda to Tdc. In each of the upper arm transistors Tua to Tuc, protective diodes Dua to Duc are connected between the collector terminal and the emitter terminal so that the cathode is connected to the collector terminal and the anode is connected to the emitter terminal. Has been done. Further, in each of the transistors Tda to Tdc of the lower arm, between the collector terminal and the emitter terminal, the cathode is connected to the collector terminal, and the anode is connected to the emitter terminal.
Ddc is connected.

The collector terminals of the respective transistors Tua to Tuc of the upper arm are connected to the positive electrode of the battery 10, respectively. Also, the upper arm transistors Tua to T
The emitter terminals of uc are connected to the collector terminals of the corresponding lower arm transistors Tda to Tdc.
The emitter terminals of the transistors Tda to Tdc are
Each is connected to the negative electrode of the battery 10.

The base terminals of the transistors Tua-Tuc and Tda-Tdc are connected to the traveling controller 17. The controller 17 includes the transistors Tua-Tuc,
The control signals .phi.ua to .phi.uc and .phi.da to .phi.dc for the known inverter control are generated and output for Tda to Tdc, respectively. The transistors Tua to Tuc and Tda to Tdc are on / off controlled by the control signals φua to φuc and φda to φdc. Then, from the emitter terminal of the transistor Tua of the upper arm, the a-phase AC power source is the a-phase changeover switch 13
Is output to the movable terminal 13a. Also, from the emitter terminal of the upper arm transistor Tub, the b-phase AC power is output to the movable terminal 14a of the b-phase changeover switch 14. Further, the c-phase AC power supply is output from the emitter terminal of the upper arm transistor Tuc to the movable terminal 15a of the c-phase changeover switch 15.

The waveform of the a-phase AC power supply is a waveform whose phase is advanced by 120 degrees from the waveform of the b-phase AC power supply, and the waveform of the b-phase AC power supply is a waveform whose phase is advanced by 120 degrees from the waveform of the c-phase AC power supply. It will be generated and output as follows. The control is performed by the control signals φua to φuc and φda to φdc generated by the controller 17. Further, the frequency of each phase is determined in accordance with, for example, the operation amount of the accelerator pedal input to the controller 17. Then, the controller 17 is adapted to generate and output control signals φua to φuc and φda to φdc for achieving the frequency.

Therefore, the inverter 12 converts the DC power source of the battery 10 into a three-phase AC power source by the traveling controller 17 and outputs it. Changeover switch 13 to 15 for each phase
Includes movable terminals 13a to 15a and two fixed terminals 13b to 15b and 13c to 15c, respectively. The movable terminals 13a to 15a of the changeover switches 13 to 15 are
Switching is performed between the fixed terminals 13b to 15b and the fixed terminals 13c to 15c. This switching is performed by the traveling controller 17
It is switched by. When the controller 17 is in the traveling mode, the controller 17 connects the movable terminals 13a to 15a and the fixed terminals 13b to 15b. When the controller 17 is in the charging mode, the controller 17 moves the movable terminals 13a to
15a is connected to the fixed terminals 13c to 15c.

Fixed terminal 13 of each changeover switch 13-15
b to 15b are connected to the windings of the corresponding phases of the three-phase induction motor 16, respectively. Therefore, the movable terminals 13a to
When a three-phase AC power supply is input from the inverter 12 via the inverter 13c, the three-phase induction motor 16 is rotationally driven based on the power supply.

A-phase and b-phase fixed terminals 13c and 14c
Is connected to the secondary side inductive connector 22 of the inductive connector 20. That is, the fixed terminals 13c and 14c are connected between both end terminals of the secondary winding 22a of the secondary side induction connector 22. Therefore, when all the transistors Tua to Tuc and Tda to Tdc of the inverter 12 are in the off state, the fixed terminal 13
When the battery 10 is viewed from the terminals c, 14c through the movable terminals 13a, 14a, a bridge type rectifier circuit is formed by the a-phase and b-phase protection diodes Dua, Dub, Dda, Ddb as shown in FIG. To be done. As a result, the fixed terminals 13c,
When a single-phase AC power source is generated between 14c, the AC power source supplies the diodes Dua and Du through the movable terminals 13a and 14a.
The battery 1 is rectified by a rectifier circuit composed of b, Dda, and Ddb, and smoothed by the capacitor 11 in the next stage.
A smoothed DC power source is applied to 0.

As shown in FIG. 2, the secondary side induction connector 22 of the induction type connector 20 is provided with respect to the casing 23 in which the smoothing capacitor 11, the inverter 12, the changeover switches 13 to 15 and the controller 17 are built. It is provided separately. The main body of the secondary side induction connector 22 is attached to the vehicle body frame, and the secondary side induction connector 22 and the changeover switches 13 and 14 are connected via lead wires L1 and L2.

The secondary side induction connector 22 has a recess 22.
A sensor 18 for detecting whether or not the primary side induction connector 21 is attached is provided in b. The sensor 18 is connected to the traveling controller 17. Then, the traveling controller 17 enters the charging mode when the sensor 18 detects the connection of the primary side induction connector 21. When the sensor 18 does not detect the connection of the primary side induction connector 21, the traveling controller 17 enters the non-charge mode, that is, the traveling mode.

The primary side induction connector 21 of the induction type connector 20 is connected to the lead wires L3 and L of the charging device installed outdoors.
4 are connected. The charging device is a rectifier circuit 2
5, a smoothing capacitor 26, an inverter 27, and a charging controller 28. The rectifier circuit 25 is composed of four diodes D1 to D4. Four
The individual diodes D1 to D4 form a bridge-type rectifier circuit, and an outlet 29 is connected to its input terminal. When single-phase AC power is input from the outlet 29,
It is rectified by the rectifier circuit 25. The DC voltage rectified by the rectifier circuit 25 is smoothed by the capacitor 26 connected in parallel with the rectifier circuit 25. The smoothed DC voltage is output to the inverter 27.

The inverter 27 includes two upper arm enhancement type N channel MOS transistors T1 and T.
Enhancement type N channel M with 2 or 2 lower arms
It is composed of OS transistors T3 and T4. In each of the transistors T1 to T4, protective diodes D1 to D4 are connected between the drain terminal and the source terminal so that the cathode is connected to the drain terminal and the anode is connected to the source terminal. .

The positive voltage of the rectified DC voltage is applied to the drain terminals of the transistors T1 and T2 of the upper arm. In addition, each transistor T1 of the upper arm
The source terminal of T2 is connected to the drain terminals of the corresponding lower arm transistors T3 and T4.
Then, a minus voltage of the rectified DC voltage is applied to the source terminals of the transistors T3 and T4.

The gate terminals of the transistors T1 to T4 are connected to the charging controller 28. The controller 28 supplies the control signal φ1 to the transistors T1 and T4 and the control signal φ to the transistors T2 and T3.
2 is generated and output respectively. The control signal φ2 is an inverted signal of the control signal φ1 and becomes L level when the control signal φ1 is at H level, and becomes H level when the control signal φ1 is at L level. The cycle of the control signals φ1 and φ2 is controlled by the charging controller 28. Therefore, when the control signal φ1 is at H level, the transistors T1 and T4 are turned on and the transistors T2 and T3 are turned off. On the contrary, when the control signal φ1 is at L level, the transistor T
1, T4 are turned off, and transistors T2, T3 are turned on.

A primary side inductive connector 22 is connected between the source terminals of the transistors T1 and T2. That is, both ends of the primary winding 21a of the primary side induction connector 21 are connected to the source terminals of the transistors T1 and T2. Therefore, the transistors T1, T
When 4 is turned on, a current flows through the primary winding 21a in the direction of the arrow as shown in FIG. Also, the transistor T
When 1 and T4 are off, a current flows through the primary winding 21a in the direction opposite to the arrow. As a result, the charging controller 28 can cause an alternating current to flow in the primary winding 21a by controlling the transistors T1 to T4.

As shown in FIG. 2, the primary side induction connector 21 is an outdoor charging device which is formed in a disk shape and includes a rectifying circuit 25, a capacitor 26, an inverter 27 and a charging controller 28 via lead wires L3 and L4. It is connected to the. The disk-shaped primary-side induction connector 21 is mounted in the fitting recess 22b of the secondary-side induction connector 22 so as to overlap the secondary winding 22a.
Therefore, an induced electromotive force is generated in the secondary winding 22a by the alternating current flowing through the primary winding 21a.

The primary side induction connector 21 is provided with a sensor 30 for detecting whether or not it is connected to the secondary side induction connector 22. The sensor 30 is the charging controller 28.
It is connected to the. Then, the charging controller 28
Detects that the sensor 30 is connected to the secondary side induction connector 22, the charging mode is set. Further, when the charging controller 28 detects that the sensor 30 is not connected to the secondary side induction connector 22, the charging controller 28 enters the non-charging mode.

The charging controller 28 is provided with a start switch 31. When the start switch 31 is operated in the charging mode, the controller 28 executes the processing operation for the charging operation of the outdoor charging device.

Next, the operation of the charging device constructed as described above will be described. When the primary guide connector 21 and the secondary guide connector 22 are not connected, the sensor 18 provided in the secondary guide connector 22 outputs a signal indicating that they are not connected to the traveling controller 17. The controller 17 enters the traveling mode and the changeover switches 13 to 1
5 movable terminals 13a to 15a are fixed terminals 13b to 15b
Connect to. Then, the controller 17 controls the control signals φua to φ of a predetermined cycle based on the operation amount of the accelerator petal or the like.
uc, φda to φdc are generated and output appropriately. The transistors Tua-Tuc, Tda-Tdc have control signals φua-φuc,
On / off control is performed by φda to φdc. The DC power supply of the battery 10 is inverter-controlled by the inverter 12 to output a three-phase AC power supply having a frequency corresponding to the operation amount of the accelerator petal to the three-phase induction motor 16. Then, the three-phase induction motor 16 is driven by this three-phase AC power supply, so that the electric vehicle runs.

When the primary side induction connector 21 and the secondary side induction connector 22 are connected, the sensor 18 provided in the secondary side induction connector 22 outputs a signal indicating the connection to the traveling controller 17. The controller 17 enters the charging mode, and the movable terminals 13 of the changeover switches 13 to 15 are placed.
a to 15a are connected to the fixed terminals 13c to 15c. Therefore, the three-phase AC power is not input to the three-phase induction motor 16, and the motor 16 is not driven. Further, since the controller 17 turns off all the transistors Tua to Tuc and Tda to Tdc, the secondary winding 22a of the secondary side induction connector 22 is fixed to the fixed terminals 13c and 14c and the movable terminal 1.
When the battery 10 is viewed through 3a and 14a, a rectifier circuit including diodes Dua, Dub, Dda, and Ddb is formed in the front stage of the battery 10.

On the other hand, the sensor 30 provided on the primary side induction connector 21 outputs a signal indicating that the sensor 30 is connected to the charging controller 28. In response to this signal, the charging controller 28 shifts from the non-charging mode to the charging mode. The charging controller 28 starts the charging operation when the start switch 31 is operated in the charging mode. The charging controller 28 outputs control signals φ1 and φ2 of a predetermined cycle to the respective transistors T1 to T4 of the inverter 27 to cause an alternating current to flow in the primary winding 21a of the primary side induction connector 21. An induced electromotive force is generated in the secondary winding 22a of the secondary side induction connector 22 by passing an alternating current through the primary winding 21a.

This induced electromotive force is generated by the diodes Dua and Du.
It is rectified by a rectifier circuit composed of b, Dda, and Ddb, and smoothed by the capacitor 11 in the next stage. And
The smoothed DC voltage charges the battery 10 as a charging voltage. At the time of this charging, the charging controller 28
At each time, the frequency of the alternating current flowing through the primary winding 21a is controlled to control the value of the charging voltage applied to the battery 10 to fully charge the battery 10.

When charging is completed, the charging controller 2
8 turns off all the transistors T1 to T4 to end the charging operation. Then, when the primary-side induction connector 21 is pulled out from the secondary-side induction connector 22, the traveling controller 17
Changes from the charging mode to the running mode, and the electric vehicle is ready to run.

As described above, in this embodiment, in order to rectify the induced electromotive force generated in the secondary winding 22a of the secondary side induction connector 22 in the non-contact type charging device, the existing structure is provided for the traveling control. The protection diodes Dua, Dub, Dda, and Ddb of the inverter 12 of FIG. Therefore, unlike the conventional case, it is not necessary to provide a dedicated rectifier circuit for charging, the circuit for charging can be simplified correspondingly, and the cost can be reduced, and the housing for incorporating the circuit for charging is also available. 23 can be miniaturized.

Moreover, in the conventional dedicated rectifier circuit, a heat radiation member for heat generation of the diode constituting the rectifier circuit is required, but in the present embodiment, the existing diode is used and heat radiation countermeasures for the diode are considered. Has been done. Therefore, since it is not necessary to provide a new heat dissipation member for heat generation of the diode, it is possible to further reduce the size of the housing 23 including the circuit for charging.

Further, in this embodiment, the secondary side induction connector 22 is separated from the housing 23. Therefore, the heat generated in the secondary side inductive connector 22 generated during charging is not transferred to the housing 23. As a result, it is not necessary to form a heat dissipation structure therefor in the housing 23, and the housing 23 can be further downsized.

Further, in this embodiment, the secondary side induction connector 2
2 is provided with the sensor 18 and when the primary side induction connector 21 is connected, the traveling controller 17 enters the charging mode based on the signal from the sensor 18. Then, the controller 17 switches the changeover switches 13 to 15 so that the battery 10 can be charged. Therefore,
Since the charging is set by simply inserting the primary-side induction connector 21 into the secondary-side induction connector 22, the charging operation becomes very simple.

Further, in this embodiment, when the sensor 30 is provided on the primary side induction connector 21 and is coupled to the secondary side induction connector 22, the charging controller 28 is in the charging mode based on the signal from the sensor 30. . Then, when the charging mode is entered, the charging operation is started only when the start switch 31 is turned on. Therefore, charging is not performed in a state where the primary side induction connector 21 is not connected to the secondary side induction connector 22.

The present invention is not limited to the above embodiments, but may be carried out in the following modes. In the above-described embodiment, the inverter 12 of the traveling control device is N
Although a PN transistor is used, a MOS transistor, a thyristor, a static induction transistor (SIT) or the like may be used. Although the inverter 27 of the charging device uses a MOS transistor in the above-described embodiment, it may be implemented by an NPN transistor, a thyristor, a static induction transistor (SIT), or the like. In the above embodiment, the sensor 18 is attached to the secondary side induction connector 22.
Although this is provided, this may be omitted. In this case, the changeover switches 13 to 15 are switched by providing a new switch and using the operation signal. In the above embodiment, the sensor 30 is attached to the primary side induction connector 21.
Although this is provided, this may be omitted. In this case, by turning on the start switch 31, the charging device immediately performs the charging operation. Although the secondary side induction connector 22 and the housing 23 are separated from each other in the above-described embodiment, the secondary side induction connector 22 may be assembled to the housing 23. In this case, heat dissipation measures are required, but since the secondary side induction connector 22 and the housing 23 are integrated, the assembly work process is simplified. In the above-described embodiment, the battery charger installed outdoors has a rectifier circuit 25, an inverter 27, etc., and is capable of controlling the frequency of the alternating current flowing through the primary winding 21a of the primary induction connector 21. When it is not necessary to fully charge the battery, it is not necessary to use the AC current output from the outdoor charging device of the above embodiment. For example, a household AC power source is directly connected to the primary winding 21 of the primary side induction connector 21.
The induced electromotive force may be generated in the secondary side inductive connector by flowing it into a. In this case, although it cannot be fully charged, it is effective for temporary charging for emergency evacuation.

The technical ideas other than the claimed invention which can be grasped from the above embodiments will be described below together with their effects. An automobile charging device according to any one of claims 1 to 3,
A rectifier circuit that converts single-phase AC to DC power, an inverter that converts the DC power to AC power, and a secondary-side induction connector that is connected to the secondary-side induction connector with AC power from the inverter. An electric vehicle charging system including an outdoor charging device including a primary-side induction connector that induces electric power.

When the battery mounted in the vehicle is fully charged, the charging voltage that is changed from time to time for full charging is controlled by the inverter provided in the outdoor charging device, and the alternating current flowing in the secondary induction connector is used. It can be generated to control the frequency of the power supply. Therefore, on the vehicle side,
It is not necessary to provide a circuit for controlling the charging voltage from time to time.

[0047]

According to the first aspect of the present invention, the handling is easy and the circuit for charging can be simplified.
It has an excellent effect that a case containing a circuit for charging can be downsized.

According to the second aspect of the invention, there is an excellent effect that the heat dissipation structure is further simplified and the case containing the charging circuit can be downsized. According to the invention of claim 3, there is an excellent effect that the operation at the time of charging can be performed more easily and surely.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram for explaining an automobile battery charger embodying the present invention.

FIG. 2 is a perspective view illustrating a relationship between an inductive connector and a housing.

FIG. 3 is an equivalent circuit diagram for explaining a vehicle charging device during charging.

[Explanation of symbols]

10 ... Battery, 12 ... Inverter, 13-15 ... Changeover switch, 16 ... Three-phase induction motor, 17 ... Running controller, 18, 30 ... Sensor, 21 ... Primary side induction connector, 22 ... Secondary side induction connector, Tua ~ Tuc, Tda ~ T
dc ... NPN transistor, Dua-Duc, Dda-Ddc ... Protective diode.

Claims (3)

[Claims] 1. A secondary induction connector which is provided at a position connectable to a primary induction connector and which generates an induced electromotive force by an alternating current flowing through the primary induction connector, and is driven by a three-phase AC power supply. An induction motor, an inverter including six switching elements for converting a DC power supply of a battery provided in a vehicle into a three-phase AC power supply, and a diode connected in parallel to the switching element; It is provided between the motor and the inverter, and supplies three-phase AC power from the inverter to the induction motor when it is not charged, and the induced electromotive force generated in the secondary-side induction connector when it is charged by the diode for two phases of the inverter. A charging device for an automobile, comprising: a changeover switch for supplying a charging voltage to a battery via a rectifying circuit formed. 2. The inverter and the changeover switch are provided in the same housing, the secondary side induction connector is provided at a position separated from the case, and the secondary side induction connector and the changeover switch are connected by a lead wire. The vehicle charging device according to claim 1. 3. A sensor for detecting whether or not the primary side induction connector is connected to the secondary side induction connector, and when the sensor detects the connection of the primary side induction connector, the changeover switch is switched to the charging side. The vehicle charging device according to claim 1, further comprising a controller.