JPH10304580A - Power supply - Google Patents

Abstract

(57) [Problem] To prevent electric corrosion of a casing or the like due to leakage current due to insulation failure on the load side of a power supply device. A power supply device in which an input-side switching unit (12) intermittently supplies current from an electric power supply unit (11) to an energy storage circuit (13) having an inductor (131) and outputs energy stored during conduction to a power supply unit (15) when shut off. An output-side switching unit 14 for switching between conduction and interruption between an output terminal 13b of the energy storage circuit 13 and an input terminal 15a of the power-supplied unit 15;
The input and output switching units 12, 14
Is operated such that when one is on, the other is off, and the input side and the output side of the energy storage circuit 13 are always insulated so that a closed circuit including a casing or the like as a part is not formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for converting input power into AC and DC and outputting the converted power.

[0002]

2. Description of the Related Art An energy storage circuit for storing energy in an energy storage element such as an inductor or a capacitor is formed in a power supply, and a voltage input to the energy storage circuit is intermittently held so that the energy storage element retains energy when energized.
Some devices are designed to output the power when the power is turned off, and convert input electric energy from AC to DC and control output voltage and current. Since a heavy component such as a transformer is not used, it is widely applied to a battery charger for an electric vehicle as described in, for example, Japanese Utility Model Application Laid-Open No. 58-34543.

In such a power supply device, an input power supply for supplying power to the energy storage circuit is usually grounded at one of its poles, and a casing of a device serving as a load and a chassis of a vehicle on which a battery is mounted are also grounded to prevent electric shock. ing.

[0004]

In recent years, the size of load devices has been reduced, and the mounting density of components in a casing has become extremely high. In addition, there is a device such as a battery charging device for an electric vehicle which must be used in a severe environment such as vibration and dust. For this reason, there is a possibility that insulation deterioration occurs between the component and the casing or the like. 58-34
As in the charging device for electric vehicles described in JP-A-543,
In a circuit in which the input side and the output side of the energy storage circuit are not insulated, when insulation failure occurs between one pole of a load such as a battery and a casing, the load, the casing, etc.
A closed circuit that returns to the load via the ground, the input power supply, and the energy storage circuit is formed, and there is a possibility that electric corrosion may occur in the casing and the like.

Accordingly, an object of the present invention is to provide a power supply device for preventing electric corrosion of a casing or the like due to leakage current.

[0006]

According to the present invention, an input-side switching means for switching between conduction and cutoff between an input end of an energy storage circuit for storing energy in an energy storage element and an output end of a power supply means. Is provided for each output terminal of the power supply means, and output-side switching means for switching between conduction and cutoff between the output terminal of the energy storage circuit and the input terminal of the power supply means is provided for each input terminal of the power supply means. There is provided control means for operating the input-side switching means and the output-side switching means such that when one is on, the other is off.

In the energy storage circuit, the voltage is intermittently applied from the power supply means by the input side switching means,
Energy is stored in the energy storage element at the time of energization, and is output to the power-supplied means at the time of interruption. Since either the input-side switching means or the output-side switching means is off, the power supply means and the energy storage circuit or the power supplied means and the energy storage circuit are substantially always insulated. . Therefore, even if insulation failure occurs between the power-supplied means and its casing or the like, a closed circuit is formed from the casing or the like to the power-supplying means via the ground, returning from the power-supplying means to the power-supplied means via the energy storage circuit. No electrical corrosion occurs in the casing and the like.

According to the second aspect of the present invention, there is provided a delay time between when one of the input-side switching means and the output-side switching means is switched from on to off and the other is switched from off to on. This prevents both the input-side switching means and the output-side switching means from being simultaneously turned on due to an operation response delay of the switching means.

According to a third aspect of the present invention, the power supply for converting AC to DC has a configuration in which the energy storage circuit has a rectifier circuit for rectifying an output current from the energy storage element.

If any part of the energy storage element is deteriorated in insulation, the energy storage element is electrically connected to the ground via the casing of the power supply device, and is returned to the energy storage element via the ground and the AC power supply. Even if a closed circuit is formed, the alternating current is applied to the energy storage element, so that the leakage current flowing through the casing or the like is also the one obtained by switching the alternating current, and the direct current component is the asymmetry of the circuit. It will be very weak. Thus, the casing and the like are prevented from being electrically corroded by a leakage current.

According to a fourth aspect of the present invention, there is provided a power supply device for charging a rechargeable battery for supplying power to a stator winding of an AC motor via an inverter for converting DC power to AC power. I do. The output end of the power supply means is connected to a connection point where the stator winding of the AC motor is connected to the inverter, via the input-side switching means, and the energy storage element is a stator winding of the AC motor. The rectifier circuit is constituted by a feedback diode of an inverter.

Since the stator winding of the AC motor and the feedback diode of the inverter can be used as the energy storage element and the rectifier during charging, the configuration of the device can be simplified and the cost can be reduced.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIG. 1 shows a power supply device of the present invention. The power supply device is for charging, and includes a DC power supply 11 serving as a power supply unit;
It has an inverting buck-boost chopper circuit 1a having its output as an input, and power is supplied from the inverting buck-boost chopper circuit 1a to a battery 15 as a power-receiving means to be charged.

The inverting step-up / step-down chopper circuit 1a includes an energy storage circuit 13 having an inductor 131 as an energy storage element, and an input-side switching section 1 at a preceding stage.
And 2. The switching unit 12 on the input side
Output terminal 11a of DC power supply 11 and energy storage circuit 13
A switching element 121 serving as an input-side switching means for switching between conduction and cutoff between input terminals 13a of the DC power supply 11 is provided for each output terminal 11a. Energy from the power supply 11 is stored in the inductor 131 and output when the switching element 121 is shut off.

A switching section 14 on the output side is provided downstream of the inverting buck-boost chopper circuit 1a. The output-side switching unit 14 includes a switching element 141 serving as an output-side switching unit that switches between conduction and cutoff between the output terminal 13 b of the energy storage circuit 13 and the input terminal 15 a of the battery 15, for each input terminal 15 a of the battery 15. It is provided.

The control circuit 16 controls the input-side and output-side switching units 12, 14, and a common control signal is input to the bases of both switching elements 121 of the input-side switching unit 12. I have. The control signal is given as a pulse signal having a predetermined cycle, the switching element 121 is turned on and off, and the power supply from the DC power supply 11 to the energy storage circuit 13 is intermittent. Both switching elements 141 of the switching unit 14 on the output side
Another common control signal is input to the base. The control signal is a pulse signal having a phase opposite to that of the control signal input to the input-side switching unit 12. The switching element 141 is turned on and off, and the power supply from the energy storage circuit 13 to the battery 15 is intermittent.

The operation of the power supply will be described. When the switching element 121 of the input-side switching unit 12 is energized, energy from the DC power supply 11 is stored in the inductor 131 of the energy storage circuit 13. The stored energy is supplied to the battery 15 via the switching element 141 of the output-side switching unit 14 that is conducting at this timing when the switching element 121 of the input-side switching unit 12 is cut off.

Normally, one side (for example, the negative electrode) of the DC power supply 11 is grounded, and the casing on which the battery 15 is mounted is also grounded for safety.
On the other hand, the switching element 1 of the switching unit 12 on the input side
Since either 21 or the switching element 141 of the output-side switching unit 14 is off, the input side or the output side of the energy storage circuit 13 is always shut off. Moreover, the switching elements 121 and 14
1 are provided for each output terminal 11a of the DC power supply 11 and each input terminal 15a of the battery 15,
And the energy storage circuit 13 or between the battery 15 and the energy storage circuit 13 is substantially always insulated. Therefore, even if any of the poles of the battery 15 causes insulation failure with the casing or the like, the battery 15, the ground, the DC power supply 11, the energy storage circuit 1
No closed circuit is formed which returns to the battery 15 again via 3. Thus, no leakage current flows through the casing or the like, and no electrical corrosion of the casing or the like occurs.

The switching section 1 on the input side depends on the variation in the response delay time of the switching elements 121 and 141.
In order to prevent the occurrence of a period in which both the switching unit 2 and the output-side switching unit 14 are turned on, the duty ratio of the control signal is adjusted to reduce the on-period of the switching element in one or both switching units. It is set so that one of the input-side switching unit and the output-side switching unit switches from off to on after a predetermined delay time has elapsed since one of the switching units switches from on to off. By providing the off period, it is possible to prevent both the input-side switching unit and the output-side switching unit from turning on.

The switching units 12 and 14 do not turn on and off at the same frequency.
One is set to an integral multiple of the other frequency, and the on-period of the switching element of the switching unit (the switching element 121 of the input-side switching unit 12 in the example shown in FIG. 2) is activated by the low frequency control signal as shown in FIG. May be set to be shorter than the off period of the switching element of the switching unit (the switching element 141 of the switching unit 14 on the output side in the illustrated example) that operates with a high control signal. Even in such a setting, when one of the switching units 12 (14) is on, the other switching unit 14 (12) is off. Therefore, the energy storage circuit 13 always has the input side disconnected from the DC power supply 11 or the output side connected to the battery. 1
Blocked from 5.

(Second Embodiment) FIG. 3 shows a second power supply device of the present invention. Elements for charging a battery with an AC power supply such as a commercial power supply or a generator are denoted by the same reference numerals for elements that operate substantially the same as in FIG. 1, and a description will be given focusing on differences from the first embodiment. I do. In the present embodiment, an AC power supply 111 and a 4-diode bridge rectifier circuit 112 are provided instead of the DC power supply, and a pulsating current is input to the step-down chopper circuit 1b. The step-down chopper circuit 1b includes an inductor 13 serving as an energy storage element.
2 is an energy storage circuit 13A connected in series to the battery 15A. Even in such a configuration, any one of the input side and the output side of the energy storage circuit 13A is insulated, so that even if any of the poles of the battery 15A causes insulation failure, electric corrosion does not occur due to leakage current in the casing or the like.

(Third Embodiment) FIG. 4 shows a battery charger for an electric vehicle to which the power supply device of the present invention is applied. The charging device is a battery 21 for an electric vehicle as a power-supplied means.
It is configured to share a part of the circuit of the drive system of the three-phase AC motor that generates the power of the electric vehicle.

First, a circuit configuration as a motor drive system will be described. The motor drive unit 2a converts the DC power of the battery 21 into AC power, and
Unit 23 for supplying power to the inverter unit 2 and the inverter unit 2
3 is provided with a capacitor 24 for stabilizing the power supply to 3. The stator winding 22 is a U, V, W phase stator winding 2
2U, 22V and 22W are star-connected. The inverter unit 23 includes six sets of IGBTs 23 connected in parallel.
This is a known three-phase six-arm bridge circuit including a 1 and a reflux diode 232. Note that the inverter unit 23
, Power transistors other than IGBTs are also preferably used.

Each end point of the stator windings 22U, 22V and 22W is connected to a connection midpoint of the IGBT 231 connected in series. In the gate of IGBT231,
The control circuit 4 outputs a control signal for turning on and off the IGBT 231. The control circuit 4 outputs an operation command corresponding to the accelerator amount or the like from the vehicle computer 5 and controls the phase stator windings 22U, 22V, 2 according to the command value.
The phase current flowing to 2 W is PWM controlled.

A precharge resistor 25 and a first relay 26 connected in series are connected between the battery 21 and the motor driver 2a.
In addition, they are connected by a second relay 27 in parallel with them. The first relay 26 is closed immediately after startup, and after the capacitor 21 is charged by the battery 21 via the precharge resistor 25, the second relay 27 is turned on to directly supply power from the battery 21 to the motor drive unit 2a. Becomes possible.

A circuit configuration as a battery charging system will be described. Two of the phase stator windings 22U, 22V, and 22W (the U-phase stator winding 22U and the W-phase stator winding 22
W) indicates that the end points 221U and 221W which are input terminals are
The AC power supply 31 is connected to the output terminals 31a and 31b of the AC power supply 31 via the input-side switching unit 33 and the filter circuit 32, so that an AC voltage is applied from the AC power supply 31 to the serially connected stator windings 22U and 22W. , And the stator windings 22 </ b> U and 22 </ b> W operating as inductors and the capacitor 24 serve as energy storage elements for storing energy from the AC power supply 31.

When the battery 21 is charged, the inverter 23 turns off the IGBT 231 and turns off the stator windings 22U and 22W.
A bridge rectifier circuit is formed by the four reflux diodes 232 connected to. The capacitor 24 is used for smoothing the output of the inverter unit 23.

The stator windings 22U, 22W connected in series
, An inverter unit 23 and a capacitor 24 form an energy storage circuit 3a (hereinafter, when the stator windings 22U and 22W connected in series and the inverter unit 23 are operated as circuit elements of a battery charging system, an inductor is used. 22U, 22W, rectifier circuit 23).

The AC power supply 31 is connected via a vehicle connector (not shown) when the battery 21 is charged. One of the poles of the AC power supply 31 is grounded, and the chassis of the vehicle is grounded in common with the AC power supply 31 to prevent electric shock by this connector. A casing such as an envelope of the motor is grounded via a chassis.

The switching section 33 on the input side includes a switching circuit 331 as a switching means and a driving circuit 332.
Are provided for each of the output terminals 31a and 31b of the AC power supply 31. The switching circuit 331 connects the IGBT 3311 and the diode 3312 connected in anti-parallel to each other in series for two times.
The IGBT 3311 is connected to the emitters, the diode 3312 is connected to the anodes, and the IGBT 3311 is connected to the IGBT 3311 and the diode 3312.
Comrades are in the opposite direction.

A drive circuit 3 is connected to the gates of both IGBTs 3311.
32 outputs a common control signal for controlling on / off of the IGBT 3311.
1 are turned on and off together.

The control signal output from the drive circuit 332 is a pulse voltage of several kHz to several tens kHz set by the control circuit 4 as a control means, and is common to both drive circuits 332. The output terminals 31a, 31a of the AC power supply 31 are operated at high speed by the control signal having a higher frequency than that of the AC power supply 31.
b and the input terminals 221U and 221 of the energy storage circuit 3a.
Conduction and interruption between W are alternately performed. Each switching circuit 331 is provided with two sets of IGBTs 3311 and diodes 3312 connected in series in an anti-parallel manner.
This is because conduction and interruption can be performed regardless of the direction in which the current flows from.

The filter circuit 32 is a known circuit composed of an inductor and a high-frequency capacitor. By smoothing the current waveform at the time of switching of the input-side switching section 33, the harmonic component of the current flows to the AC power supply 31 side. This prevents leakage and prevents inrush current when the input-side switching section 33 is turned on.

A switching section 34 on the output side and a third relay 35 are provided downstream of the rectifier circuit 23. The output-side switching unit 34 includes a switching circuit 341 and a drive circuit 342. The switching circuit 341 is provided for each of the input terminals 21 a and 21 b of the battery 21. The switching circuit 341 includes the IGBT 3411 and the diode 3
412 are connected in series, the emitter of the IGBT 3411 is connected to the anode of the diode 3412, and the forward direction of the IGBT 3411 is the same as that of the diode 3412. The drive circuit 34 is connected to the gate of the IGBT 3411.
2 outputs a control signal for controlling ON / OFF of the IGBT 3411.

The control signal output from the drive circuit 342 is set by the control circuit 4 and has a phase opposite to that of the control signal for controlling the IGBT 3311 of the switching section 33 on the input side, and is connected to the input terminals 21 a and 21 b of the battery 21. The conduction and cutoff between the output terminals 23a and 23b of the energy storage circuit 3a are determined by the AC power supply 31 and the energy storage circuit 3a.
The conduction and the cutoff are alternately performed in opposite phases.

The third relay 35 is turned on when the battery 21 is charged, and connects the battery 21 and the capacitor 24 for smoothing the output of the inverter 23.

FIGS. 5 and 6 show the circuit shown in FIG. 4 except that the AC power supply 31, the battery 21, the inverter 21 and the like are unitized. 7 and 8 show a state before some parts are assembled. 7 and 8,
On the plate 61, an inductor 321 and a high-frequency capacitor 322 constituting the filter circuit 32, an IGBT module 331 on which the switching circuit 331 of the input side switching unit 33 is mounted, and a switching circuit 341 of the output side switching unit 34 are mounted. IG
The BT module 341 is mounted. Plate 6
Further, a thermistor 71 for detecting an excessive rise in temperature is fixed to 1. The plate 61 is a high heat transfer material made of aluminum or copper, and enhances the heat radiation effect of the IGBT modules 331, 341 and the like.

The IGBT modules 331 and 341 are fixed to the plate 61 via highly heat-conductive grease. The inductor 321 and the high-frequency capacitor 322 are fitted in mounting holes formed in the plate 61, and the amount of fitting is such that the rear surface of the plate 61 does not become uneven due to these protrusions as shown in the figure.

The plate 61 also includes two drive circuit boards 72 on which the IGBT drive circuits 332 and 342 are mounted.
a, 72b are attached. Drive circuit board 72
a and 72b are connected to each other by a flat wire (not shown),
The drive circuit board 72b is an IGBT module 331, 34
1 is directly connected by soldering. Drive circuit board 7
Reference numeral 2a denotes a component on which a heavy component such as a driving power supply is mounted. The electronic component and the back surface of the peripheral portion where the printed pattern is not formed are attached to the plate 61 in close contact. An opening 61a (see FIG. 8C), which is slightly smaller than the drive circuit board 72a, is formed in the plate 61, and the parts mounted on the back surface of the drive circuit board 72a and the printed pattern are insulated from the plate 61. It has become so.

The drive circuit board 72b has light components such as drive transistors mounted thereon, and one of the drive circuit boards 7 is provided above the drive circuit board 72a by four hexagonal columns 62.
It is fixed to the plate 61 together with 2a.

5 and 6, a plate-like holder 63 is provided above the IGBT modules 331, 341 and is connected to the plate 61 by hexagonal columns 64. A control circuit board 73 on which the control circuit 4 is mounted is fixed to the holder 63. The control circuit board 73 is provided with two connectors 74 and 75, and the control circuit board 73 is connected to the drive circuit boards 72a and 72b by one connector 74 via a harness wire (not shown), and the other connector 7
5 connects the vehicle computer 5 with a harness wire (not shown).

At positions between the drive circuit boards 72a and 72b, the IGBT modules 331 and 341 and the holder 63,
A wiring substrate 76 is provided. Wiring board 76 is IGB
A wiring pattern for connecting the T module 331 to the filter circuit 32 and the stator windings 22U and 22W;
A printed circuit board on which a wiring pattern for connecting the IGBT module 341 to the inverter 23 and the battery 21 is formed, and terminals 221U, 221W, 21a, 21 for connecting to the stator windings 22U, 22W and the like.
b, 23a, 23b are provided, and the stator windings 22U, 22W and the like are connected to the unillustrated wires or bus bars made of copper or the like.

FIG. 9 shows an IGBT module 33 in which the switching circuit 331 of the input-side switching section 33 is mounted.
1 is an internal chip layout diagram of FIG. A pattern 81 for connecting the emitters of both IGBTs 3311 and connecting the anodes of both diodes 3312 to the printed circuit board 8A.
And the collector of the IGBT 3311 and the diode 3312
82, 83 connecting each cathode of each IGBT
Gate wiring patterns 84a and 84b of 3311 are formed, and these are connected to the IGBT chip 3311 and the diode chip 3312 by bonding or the like.

On the other hand, FIG. 10 is an internal chip layout diagram of a series-connected IGBT module used in the inverter unit 23, that is, an IGBT 231 and a diode 232 connected in anti-parallel and connected in series. A pattern 85 connecting the emitter of the left IGBT 231 and the collector of the right IGBT 231 and connecting the anode of the right diode 232 and the cathode of the left diode to the printed board 8B, and the left IGBT 231
86 connecting the collector of the IGBT 231 and the cathode of the diode 232 on the left, the pattern 87 connecting the emitter of the IGBT 231 on the right and the anode of the diode 232 on the right, and the gate wiring pattern 88 of each IGBT 231.
a and 88b are formed, and these and the IGBT chip 23 are formed.
1 and the diode chip 232 are connected.

As can be seen from both figures, both IGBT modules use the same chip arrangement and the same bonding position of the bonding wires (801 to 806) connecting the chip and the wiring pattern, but differ only in the layout of the wiring pattern. Can be Thus, in manufacturing the power supply device of the present invention, the input-side switching unit 33 includes a chip used for the IGBT module of the inverter unit 23,
The components such as the module envelope can be diverted and manufactured by the same manufacturing equipment, and the cost can be reduced. The switching circuit can be stored in a single envelope together with its drive circuit, and can be further reduced in size by forming an IPM (Intelligent Power Module).

The operation of the charging device will be described. When the switching section 33 on the input side is turned on, the AC power from the AC power supply 31 is supplied to the inductors 22U, 22 through the filter circuit 32.
When power is supplied to W and the inductors 22U and 22W store energy and the switching section 33 on the input side is cut off, power is supplied to the rectifier circuit 23 and rectified by the rectifier circuit 23. At this timing, power is supplied to the battery 21 via the output-side switching unit 34 that is conducting, and the battery 21 is charged. Since the rectifier circuit 23 is a bridge rectifier circuit and is subjected to full-wave rectification, the battery 21 is charged regardless of the direction of current from the AC power supply 31.

By the complementary switching operation of the input-side switching section 33 and the output-side switching section 34, the AC power supply 31 and the energy storage circuit 3a or the battery 21 and the energy storage circuit 3a are substantially always insulated. It will be. Therefore, even if any of the poles of the battery 21 causes insulation failure, the casing, the ground, the AC power supply 31, the energy storage circuit 3
A closed circuit that returns to the battery 21 via a is not formed. Thus, electric corrosion of the casing and the like is prevented.

When a part of the inductors 22U and 22W is insulated and deteriorated and conducts to the casing, a leakage current tends to flow from the battery 21 side and the AC power supply 31 side. Among them, the rectifier circuit 23 prevents the leakage current from flowing around from the battery 21 side. In addition, the leakage current that is going to flow from the AC power supply 31 returns to the inductors 22U and 22W from the AC power supply 31 again.
This leakage current constantly changes direction because an AC voltage is applied to the inductors 22U and 22W. Thus, when viewed over several cycles of the AC power supply 31, the leakage current flowing into the AC power supply 31 does not include a DC component. Therefore, even if insulation deterioration occurs in a part of the inductors 22U and 22W, electric corrosion of the casing and the like is prevented.

It should be noted that the input-side switching section 33 and the output-side switching section 34 do not always operate in opposite phases, and that there is no problem that the output-side switching section 34 is turned on for a short time. For example, when a sensor for monitoring the state of charge is provided inside the battery 21, it may be necessary to input a sufficiently stable voltage to the battery 21. The switching section on the output side is kept ON for only a while, the smoothing action of the capacitor 24 causes the rectifier circuit 23 to
Can be stabilized.

When the charging operation is started, the third relay 35 may be turned on after the switching units 33 and 34 have switched several times. In this case, the battery 21 and the capacitor 24 are separated until the voltage of the capacitor 24 rises to the same level as the battery voltage. Therefore, even if the backflow prevention diode 3412 is omitted, an excessive amount of the battery 21 is transferred from the battery 21 to the capacitor 24 at the beginning of charging. Current is prevented from flowing.

A smoothing circuit 36 including a choke coil 361, a capacitor 362, and a diode 363 may be provided downstream of the output-side switching section 34 as shown in FIG. When smoothing is unnecessary, but a surge voltage due to the inductance of the wiring between the battery 21 and the switching unit 34 poses a problem, only the diode 363 may be provided instead of the smoothing circuit 36.

[Brief description of the drawings]

FIG. 1 is an overall circuit diagram of a power supply device of the present invention.

FIG. 2 is a time chart illustrating the operation of the power supply device of the present invention.

FIG. 3 is an overall circuit diagram of another power supply device of the present invention.

FIG. 4 is an overall circuit diagram of a battery charger for an electric vehicle to which the present invention is applied.

FIG. 5 is a top view of a unit in which a part of the circuit of the battery charging device for an electric vehicle to which the present invention is applied is mounted.

FIG. 6A is a view taken in the direction of arrow X in FIG. 5, and FIG.
FIG. 6 is a view taken in the direction of the arrow Y in FIG. 5.

FIG. 7 is another top view of a unit in which a part of the circuit of the battery charging device for an electric vehicle to which the present invention is applied is mounted.

FIG. 8A is a view taken in the direction of the arrow Z in FIG. 7, and FIG.
FIG. 8 is a view taken in the direction of the arrow W in FIG. 7, and FIG. 8C is a sectional view taken along line VIIIC-VIIIC in FIG. 7.

FIG. 9 is an internal chip layout diagram of the IGBT module used in the battery charging device for an electric vehicle to which the present invention is applied.

FIG. 10 is an internal chip layout diagram of another IGBT module used in the battery charging device for an electric vehicle to which the present invention is applied.

FIG. 11 is a partial circuit diagram of another electric vehicle battery charging device to which the power supply device of the present invention is applied.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 DC power supply (power supply means) 111, 31 AC power supply (power supply means) 11a, 31a, 31b Output terminal 121 Switching element of input side switching part (input side switching means) 13, 13A, 3a Energy storage circuits 13a, 221U , 221W Input end of energy storage circuit 13b, 23a, 23b Output end of energy storage circuit 131, 132 Inductor (energy storage element) 141 Switching element of output side switching section (output side switching means) 15, 15A, 21 Battery (Power receiving means) 15a, 21a, 21b Battery input terminal 16, 4 Control circuit (Control means) 22U, 22W Fixed winding (energy storage element) 23 Inverter section (Inverter) 232 Feedback diode (Rectifier) 24 Capacitor ( Energy storage element)

Continued on the front page (51) Int.Cl. ⁶ Identification code FI H02M 3/155 H02M 3/155 F

Claims (4)

[Claims] 1. A power supply device for intermittently applying a voltage from a power supply means to an energy storage circuit for storing energy in an energy storage element, causing the energy storage element to store energy when energized, and outputting the energy to the power supply means when shut off. An input-side switching means for switching between conduction and interruption between an output terminal of the power supply means and an input terminal of the energy storage circuit to interrupt the applied voltage from the power supply means for each output terminal of the power supply means; Output-side switching means for switching between conduction and cutoff between the output end of the circuit and the input end of the power-supplied means is provided for each input end of the power-supplied means, and the input-side switching means and the output-side switching means are provided. A power supply device provided with control means for causing one to be turned on and the other to be turned off. 2. The power supply device according to claim 1, wherein said control means is provided with a predetermined delay time after one of said input-side switching means and said output-side switching means is switched from on to off. A power supply set so that the other switches from off to on. 3. The power supply device according to claim 1, wherein said power supply means is an AC power supply, and said energy storage circuit has a rectifier circuit for rectifying an output current from an energy storage element. A power supply device adapted to supply direct current to the means. 4. The power supply device according to claim 1, wherein said power-supplied means is capable of being charged for supplying power to a stator winding of an AC motor via an inverter for converting DC power to AC power. And an output end of the power supply means is connected to a connection point where the stator winding of the AC motor is connected to the inverter via the switching means on the input side, and the energy storage element is fixed to the AC motor. A power supply device in which a secondary winding is used, the rectifier circuit is configured by a feedback diode of an inverter, and a battery is charged by the power supply means.