JP2002078358A - Power supply for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To implement three-phase, four-wire alternating-current output having reduced size and weight. SOLUTION: The output lines for three-phase alternating-current flow of a three-phase inverter circuit 9 are connected via a capacitor connected with the output lines, respectively, and the output line 13 located at the middle point in terms of potential is taken as a fourth line. With this constitution, power can be supplied to a load in a three-phase, four-wire manner without having to use a transformer. A capacitor 18 for direct-current filter parallel-connected with the input stage of the three-phase inverter circuit 9 is divided into positive pole side and negative pole side, and the positive pole side and negative pole side are series-connected with the output line 13 connected with the middle point thereof. When power is supplied to a load via the output line 13, a power equivalent to lagging power factor is stored in the capacitor 18 for direct-current filter, and thus inductive load can be connected as a load.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply for a vehicle used as a power supply for a vehicle.

[0002]

2. Description of the Related Art FIG. 6 is a circuit diagram showing a configuration of a conventional vehicle power supply device applied to a train as an example of a vehicle.
The power collected from the power line by the pantograph (current collecting device) 1 is input to the DC-DC converter circuit 3 via the input circuit 2. The DC-DC converter circuit 3 has a configuration including a converter switching circuit 4 arranged in an input stage, a transformer 5 for transforming the output, and a rectifier 6 for rectifying the output of the transformer 5. The power rectified by the rectifier 6 and output from the DC-DC converter circuit 3 is D
The input is input to a three-phase inverter circuit 9 via a DC filter reactor 7 connected in series to an output stage of the C-DC converter circuit 3 and a DC filter capacitor 8 connected in parallel. The waveform is shaped into a sine wave by the AC filter reactor 10 and the AC filter capacitor 11, and is output to a load (not shown) to which each of the three-phase AC output lines is connected.

In order to obtain a 4-wire AC output, 3
Each phase alternating current output line is connected to a transformer 1 operating at a commercial frequency.
The output line 13 is connected to the load as a fourth line which is a potential middle point with respect to the output voltage of the three-phase alternating current.

As an example of the configuration of each circuit, FIG. 7 shows the configuration of the input circuit 2, FIG. 8 shows the configuration of the converter switching circuit 4, FIG. 9 shows the configuration of the rectifier 6, and FIG. The configuration of No. 9 is shown in FIG.

[0005]

As described above, in the prior art, when the three-phase AC output of the three-phase inverter circuit 9 is used as a four-wire AC output, the transformer is converted to a three-phase AC output. 12 had to be used. For this reason, the power supply device for a vehicle is large and heavy.

Further, when loads having different capacities are connected between the positive electrode side and the negative electrode side, there is a possibility that the transformer 5 may be demagnetized and saturated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object of the present invention is to provide a vehicle power supply device capable of outputting a three-phase four-wire AC output in a small and light weight. .

Another object of the present invention is to provide a power supply device for a vehicle in which when a load having a different capacity is connected between the positive electrode side and the negative electrode side, occurrence of magnetic demagnetization in the transformer is prevented.

[0009]

According to a first aspect of the present invention, there is provided a power supply device for a vehicle, comprising:
A DC filter capacitor connected in parallel to the output stage of the C-DC converter circuit, and the output of the DC filter
In a vehicle power supply device having an inverter circuit for performing phase alternating current, the DC filter capacitor is formed by connecting two capacitors on the positive and negative sides in series. An output line when each of the AC output lines is connected via a capacitor connected thereto is connected to a midpoint of the two capacitors.

In the present invention, each output line of the three-phase AC is connected via a capacitor connected to each of the three-phase alternating current lines, and the output line, which is a potential middle point, is set as the fourth line. , Power can be supplied to the load in a three-phase four-wire system, and the vehicle power supply device can be reduced in size and weight.

Also, two series-connected positive and negative electrodes are connected.
Since the fourth output line is connected to the middle point of the two DC filter capacitors, power corresponding to the delayed power factor is accumulated in the DC filter capacitors, so that an inductive load can be connected as the load.

According to a second aspect of the present invention, there is provided a vehicle power supply device comprising a DC-DC converter circuit having a transformer, a DC filter reactor connected in series to an output stage thereof, and an output of the DC filter. In a vehicle power supply device having an inverter circuit for performing three-phase AC, the DC filter reactor is formed by two reactors on a positive electrode side and a negative electrode side, and each of the three-phase AC of the inverter circuit is provided. The output line when the output line is connected via the capacitor connected to each is connected to the transformer 2
It is characterized in that it is connected to the middle point of the next winding.

According to the present invention, since the fourth output line is connected to the middle point of the secondary winding of the transformer, when supplying power to the load from the output line, a current is supplied to the DC filter capacitor. Therefore, the DC filter capacitor can be reduced in size.

Further, by providing two reactors, one on the positive electrode side and the other on the negative electrode side, the potential on the output line can always be maintained as a potential middle point.

According to a third aspect of the present invention, there is provided a vehicle power supply apparatus comprising: a DC-DC converter circuit having a transformer; a DC filter reactor connected in series to an output stage thereof; and a DC filter reactor connected in parallel. In a vehicle power supply device having a capacitor and an inverter circuit for converting the output of the DC filter into a three-phase AC, the DC filter capacitor has a middle point connected to two capacitors on a positive electrode side and a negative electrode side. The DC filter reactor is formed by two reactors, one on the positive electrode side and the other on the negative electrode side, and each output line of the three-phase AC of the inverter circuit is connected via a capacitor connected to each other. A connected output line is connected to a middle point of the two capacitors and a middle point of a secondary winding of the transformer.

According to the present invention, since the fourth output line is connected to the middle point of the secondary winding of the transformer, power is supplied from the secondary winding when power is supplied from the output line to the load. So that
The DC filter capacitor can be downsized, and the fourth output line is connected to the middle point of the two DC filter capacitors on the positive and negative sides that are connected in series. Since the power corresponding to the delay power factor is stored, the inductive load can be connected.

According to a fourth aspect of the present invention, there is provided a vehicle power supply device comprising a DC-DC converter circuit having a transformer, a DC filter reactor connected in series to an output stage thereof, and an output of the DC filter. In a vehicle power supply device having an inverter circuit for performing three-phase AC, a secondary winding of the transformer is formed by two secondary windings on a positive electrode side and a negative electrode side. Two rectifiers connected to each output stage are connected in series, and the DC filter reactor is formed by two reactors on a positive electrode side and a negative electrode side. An output line when the output line is connected via a capacitor connected to each of the output lines is connected to a middle point of the two rectifiers.

According to the present invention, the secondary winding of the transformer is independent on the positive and negative sides, and rectifiers provided at respective output stages of the two secondary windings are connected in series. By connecting the fourth output line to the point, even if the load capacity differs between the positive electrode side and the negative electrode side, the DC component current does not flow through the transformer when supplying power to the load. Since there is no,
It is possible to prevent the occurrence of the magnetic polarization phenomenon.

According to a fifth aspect of the present invention, there is provided a vehicle power supply apparatus comprising: a DC-DC converter circuit having a transformer; a DC filter reactor connected in series to an output stage thereof; and a DC filter reactor connected in parallel. In a vehicle power supply device having a capacitor and an inverter circuit for converting the output of a DC filter into a three-phase AC, a secondary winding of the transformer is formed by two secondary windings on a positive electrode side and a negative electrode side. Two rectifiers are connected in series to respective output stages of the two secondary windings, and the DC filter capacitor is formed by connecting two capacitors on the positive side and the negative side in series. The DC filter reactor is formed by two reactors, one on the positive electrode side and the other on the negative electrode side, and is a capacitor connected to each of the three-phase AC output lines of the inverter circuit. An output line formed by connecting through a support, the midpoint of the two rectifiers, characterized in that connected to the midpoint of the two capacitors.

According to the present invention, the secondary winding of the transformer is independent on the positive and negative sides, and rectifiers provided at respective output stages of the two secondary windings are connected in series. By connecting the fourth output line to the point, even when the load capacity differs between the positive electrode side and the negative electrode side, it is possible to prevent the occurrence of the magnetic demagnetization phenomenon and to connect the positive electrode side connected in series. By connecting the fourth output line also to the middle point of the two DC filter capacitors on the negative side and the negative side, the power for the delayed power factor is accumulated in the DC filter capacitor, so that an inductive load is connected. be able to.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] FIG. 1 is a circuit diagram showing a configuration of a vehicle power supply device according to a first embodiment. Here, a case where the invention is applied to a train as an example of a vehicle will be described. 6 eliminates the transformer 12 from the vehicle power supply device of FIG. 6, and replaces the AC filter capacitor 11 with three-phase AC output lines via respective connected capacitors. A configuration is provided in which a capacitor 14 for AC filter is connected to make the output line 13 a fourth line. The voltage at the output line 13 is
It is a potential middle point with respect to the output voltage of the three-phase alternating current. Further, the DC filter capacitor 8 is divided into a positive side DC filter capacitor 18a and a negative side DC filter capacitor 18b, which are connected in series, and the output line 13 is connected to the middle point. . The capacitors having the same constant are used as the DC filter capacitors 18a and 18b. In addition, the same components as those in FIG. 6 are denoted by the same reference numerals, and description thereof is omitted here.

When a load (not shown) is connected between each of the three-phase AC output lines from the three-phase inverter circuit 9 and the fourth output line 13, and a current flows from the positive electrode side, a positive electrode After supplying power to the load from the DC filter capacitor 18a on the side through the three-phase inverter circuit 9 and the AC filter reactor 10, the feedback current returns to the middle point of the DC filter capacitor 18 through the output line 13. A round loop is formed.

When a current flows from the negative electrode to the load, power is supplied to the load from the negative electrode DC filter capacitor 18b via the output line 13, and then the feedback current is changed to the AC filter reactor 10, three-phase. A loop is formed that returns to the DC filter capacitor 18b on the negative electrode side via the inverter circuit 9.

The higher harmonic component of the output line 13 generated by the three-phase inverter circuit 9 flows through a loop formed in the device via the reactor 10 for AC filter and the capacitor 14 for AC filter. It will not be supplied. Therefore, an AC sine wave can be output to the load from the fourth output line 13.

Therefore, according to the present embodiment, each output line of three-phase alternating current is connected via a capacitor connected to each, and the output line 13 which is a potential middle point is set as a fourth line. Thus, power can be supplied to the load in a three-phase four-wire system without using a transformer, and thus the vehicle power supply device can be reduced in size and weight.

Also, according to the present embodiment, a positive-side DC filter capacitor 18a and a negative-side DC filter capacitor 18b are provided at the input stage of the three-phase inverter circuit 9 and connected in series. When the power is supplied from the output line 13 to the load, the power corresponding to the delayed power factor is accumulated in the DC filter capacitor 18 by connecting the output line 13 to the output line 13, so that the inductive load can be connected as the load. it can.

[Second Embodiment] The vehicle power supply device according to the first embodiment can supply power to a load in a three-phase four-wire system without using a transformer. The capacity must be increased by an amount corresponding to the load capacity. In the second embodiment,
A power supply device for a vehicle that solves this problem will be described.

FIG. 2 is a circuit diagram showing a configuration of the vehicle power supply device according to the present embodiment. As shown in the first embodiment, the vehicle power supply device shown in FIG. 6 does not include the transformer 12 in FIG.
Is similar to FIG. 1 in that an AC filter capacitor 14 is provided in place of, and the output line 13 is the fourth line.

The power supply device for a vehicle differs from that of FIG.
In order to connect the output line 13 to the midpoint on the secondary winding of the transformer 5 and leave the potential on the output line 13 as the midpoint of the potential, the DC filter capacitor 8 is left undivided. , DC-DC converter circuit 3
Are connected to a DC filter reactor 27a on the positive electrode side and a DC filter reactor 27b on the negative electrode side. DC filter reactor 27a, 2
The same constant is used for 7b. In addition, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted here.

When a load (not shown) is connected between each output line of the three-phase AC and the output line 13 serving as the fourth line, and a current flows from the positive electrode side, when a current flows from the positive electrode side, the transformer After power is supplied to the load from the secondary winding through the rectifier 6, the DC filter reactor 27a, the three-phase inverter circuit 9, and the AC filter reactor 10, the feedback current passes through the output line 13 and the secondary of the transformer 5 A loop is formed that returns to the midpoint of the winding.

When a current is supplied to the load from the negative electrode side, power is supplied to the load via the output line 13 from the secondary winding on the negative electrode side of the transformer 5 and then the feedback current is changed to the AC filter reactor 10. A loop is formed that returns to the secondary winding on the negative side of the transformer 5 via the three-phase inverter circuit 9, the reactor 27b for the DC filter on the negative side, and the rectifier 6.

Also, the harmonic component of the output line 13 generated by the three-phase inverter circuit 9 flows through a loop formed in the device via the AC filter reactor 10 and the AC filter capacitor 14, so that the load is applied to the load. It will not be supplied. Therefore, an AC sine wave can be output to the load from the fourth output line 13.

Therefore, according to the present embodiment, the output line 13 is connected to the middle point of the secondary winding of the transformer 5,
Since no current flows through the DC filter capacitor 8 when power is supplied from the output line 13 to the load, the DC filter capacitor 8 can be reduced in size.

The output line 13 in which the three-phase AC output lines are connected via the AC filter capacitor 14 is the fourth line, so that power can be supplied to the load in a three-phase four-wire system without using a transformer. The point that it can be supplied is the same as in the first embodiment.

[Third Embodiment] In the vehicle power supply device according to the second embodiment, when the power is supplied from the output line 13 to the load, the current is reduced by the DC filter capacitor 8.
Therefore, the DC filter capacitor 8 can be downsized, but the DC filter capacitor 8 does not accumulate the power corresponding to the delayed power factor, so that an inductive load cannot be connected. In the third embodiment, a description will be given of a vehicle power supply device that solves this problem.

FIG. 3 is a circuit diagram showing a configuration of the vehicle power supply device according to the present embodiment. 1, the output line 13 is connected to the middle point on the secondary winding of the transformer 5 and the potential on the output line 13 is always maintained as the potential middle point. Therefore, the output side of the DC-DC converter circuit 3 includes a positive side DC filter reactor 27a and a negative side DC filter reactor 27a.
b is connected. In addition, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted here.

With this configuration, the output line 13 is connected to the transformer 5
And the midpoint of the secondary winding of
a and 18b are connected to both the midpoints.

Therefore, according to the present embodiment, when power is supplied from the output line 13 to the load, the power is supplied from the secondary winding of the transformer 5, so that the DC filter capacitor 1 is supplied.
8 can be reduced in size, and the power corresponding to the delayed power factor is stored in the DC filter capacitor 18.
An inductive load can be connected as the load.

It is to be noted that the output line 13 in which the three-phase AC output lines are connected via the AC filter capacitor 14 is the fourth line, so that power can be supplied to the load in a three-phase four-wire system without using a transformer. The point that it can be supplied is the same as in each of the above embodiments.

[Fourth Embodiment] In the power supply device for a vehicle in each of the above-described embodiments, when loads having different capacities are connected on the positive electrode side and the negative electrode side, there is a possibility that the transformer 5 may be demagnetized. There is a disadvantage that there is. In the fourth embodiment, a description will be given of a vehicle power supply device that solves this problem.

FIG. 4 is a circuit diagram showing a configuration of the vehicle power supply device according to the present embodiment. 2 is different from FIG. 2 in that a transformer 45 in which a secondary winding is formed by two secondary windings on a positive electrode side and a negative electrode side instead of the transformer 5 is provided.
And a rectifier 46a connected to the positive secondary winding and a rectifier 46b connected to the negative secondary winding are provided in place of the rectifier 6, and the rectifier 46a and the rectifier 46b are connected in series. The output line 13 is connected to the midpoint. In addition, the same components as those in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted here.

When a load (not shown) is connected between each output line of the three-phase AC and the output line 13 serving as the fourth line, and a current flows from the positive electrode side, when a current flows from the positive electrode side, the transformer 45 has a After power is supplied to the load from the next winding through the rectifier 46a, the DC filter reactor 27a, the three-phase inverter circuit 9, and the AC filter reactor 10, the feedback current passes through the output line 13 and passes through the middle point of the rectifier 46. Thus, a loop returning to the transformer 45 is formed.

When a current flows from the negative electrode side to the load, the rectifier 46b,
After supplying power to the load via the output line 13, the feedback current is applied to the AC filter reactor 10, the three-phase inverter circuit 9, the negative side DC filter reactor 27b, and the negative side of the transformer 45 via the rectifier 46b. A loop returning to the secondary winding is formed.

The harmonic component of the output line 13 generated by the three-phase inverter circuit 9 flows through a loop formed in the device through the AC filter reactor 10 and the AC filter capacitor 14, so that the load is applied to the load. It will not be supplied. Therefore, an AC sine wave can be output to the load from the fourth output line 13.

Therefore, according to the present embodiment, the secondary winding of the transformer 45 is independent on the positive and negative sides, and the rectifiers 46a,
46b are connected in series, and the output line 13 is connected to the middle point, so that even if the load capacity differs between the positive electrode side and the negative electrode side, the transformer is used to supply power from the output line 13 to the load. Since a DC component current does not flow through 45, the occurrence of a magnetic demagnetization phenomenon can be prevented.

This is because only the DC filter capacitors 18a and 18b are provided as shown in FIG. 1 and the DC filter capacitor 18a and the DC filter capacitor 18a are connected to each other when a load having a different capacity is connected between the positive electrode side and the negative electrode side. 18b avoids the point where the voltage becomes unbalanced and the appropriate power supply cannot be performed.

By setting the output line 13 in which the three-phase AC output lines are connected via the AC filter capacitor 14 as the fourth line, power is supplied to the load in a three-phase four-wire system without using a transformer. The point that it can be supplied is the same as in each of the above embodiments.

Further, since no current flows through the DC filter capacitor 8 when power is supplied from the output line 13 to the load, the DC filter capacitor 8 can be reduced in size in the second embodiment. Same as the form.

[Fifth Embodiment] The vehicle power supply device according to the fourth embodiment can prevent the occurrence of the magnetic demagnetization phenomenon, and can store the power corresponding to the delay power factor by the DC filter capacitor 8. No inductive load can be connected. In the fifth embodiment, a description will be given of a vehicle power supply device that solves this problem.

FIG. 5 is a circuit diagram showing a configuration of the vehicle power supply device according to the present embodiment. 4, the DC filter capacitor 8 is divided into a positive side DC filter capacitor 18a and a negative side DC filter capacitor 18b and connected in series. Is connected to the fourth output line 13. The capacitors having the same constant are used as the DC filter capacitors 18a and 18b. In addition, the same components as those in FIG. 4 are denoted by the same reference numerals, and description thereof is omitted here.

With this configuration, the output line 13 is connected to the rectifier 4
6a, 46b and the DC filter capacitor 18
a and 18b are connected to both the midpoints.

Therefore, according to the present embodiment, the DC filter capacitor 18a on the positive electrode side and the DC filter capacitor 18b on the negative electrode side are provided, and the output line 13 is connected to the midpoint between them. Capacitor 18
Since the power corresponding to the delay power factor is stored, the inductive load can be connected.

The output line 13 in which the three-phase AC output lines are connected via the AC filter capacitor 14 is the fourth line, so that power can be supplied to the load in a three-phase four-wire system without using a transformer. The point that it can be supplied is the same as in each of the above embodiments.

Further, even when the load capacity differs between the positive electrode side and the negative electrode side, the DC component current does not flow through the transformer 45, so that the occurrence of the magnetic polarization phenomenon can be prevented. , And the fourth embodiment.

[0056]

As described above, according to the power supply device for a vehicle according to the present invention, the output lines of the three-phase alternating current are connected via the capacitors connected to the respective three-phase alternating current lines, and become a potential midpoint. Since the output line is the fourth line, power can be supplied to the load in a three-phase four-wire system without using a transformer, so that the vehicle power supply device can be reduced in size and weight.

According to the power supply device for a vehicle according to the present invention, the secondary winding of the transformer is independent on the positive electrode side and the negative electrode side,
Since the rectifiers provided at the output stages of the two secondary windings are connected in series, and the fourth output line is connected to the middle point, the load capacity differs between the positive electrode side and the negative electrode side. However, since a DC component current does not flow through the transformer when supplying power to the load, it is possible to prevent the occurrence of the magnetic polarization phenomenon.

[Brief description of the drawings]

FIG. 1 is a circuit diagram illustrating a configuration of a vehicle power supply device according to a first embodiment.

FIG. 2 is a circuit diagram showing a configuration of a vehicle power supply device according to a second embodiment.

FIG. 3 is a circuit diagram showing a configuration of a vehicle power supply device according to a third embodiment.

FIG. 4 is a circuit diagram showing a configuration of a vehicle power supply device according to a fourth embodiment.

FIG. 5 is a circuit diagram showing a configuration of a vehicle power supply device according to a fifth embodiment.

FIG. 6 is a circuit diagram showing a configuration of a conventional vehicle power supply device.

FIG. 7 is a circuit diagram showing an example of the configuration of the input circuit 2.

FIG. 8 is a circuit diagram illustrating an example of a configuration of a converter switching circuit 4.

FIG. 9 is a circuit diagram showing an example of the configuration of the rectifier 6.

FIG. 10 is a circuit diagram showing an example of a configuration of a three-phase inverter circuit 9.

[Explanation of symbols]

Reference Signs List 1 Pantograph 2 Input circuit 3 DC-DC converter circuit 4 Converter switching circuit 5, 45 Transformer 6, 46a, 46b Rectifier 7, 27a, 27b DC filter reactor 8, 18a, 18b DC filter capacitor 9 Three-phase inverter circuit 10 Reactor for AC filter 11, 14 Capacitor for AC filter 12 Transformer 13 Output line 15 Diode 16 Thyristor 17 Resistor 18 DC capacitor 19 IGBT (insulated gate bipolar transisto)
r) 20 diode 21 electromagnetic contactor 22 reactor for DC filter

Claims (5)

[Claims] 1. A vehicular power supply device comprising: a DC filter capacitor connected in parallel to an output stage of a DC-DC converter circuit; and an inverter circuit for converting the output of the DC filter into a three-phase AC. Capacitors have two sides, positive side and negative side.
And three capacitors connected in series, the output lines when the three-phase AC output lines of the inverter circuit are connected via the respectively connected capacitors are connected to the two capacitors. A vehicle power supply device connected to a point. 2. A vehicle power supply comprising a DC-DC converter circuit having a transformer, a DC filter reactor connected in series to an output stage thereof, and an inverter circuit for converting the output of the DC filter into three-phase AC. In the apparatus, the reactor for the DC filter includes a positive electrode side and a negative electrode side.
An output line formed by connecting each output line of the three-phase AC of the inverter circuit via a capacitor connected to each of the output lines to a secondary winding of the transformer. A vehicle power supply device connected to a point. 3. A DC-DC converter circuit having a transformer, a DC filter reactor connected in series to an output stage thereof, a DC filter capacitor connected in parallel, and an output of the DC filter converted to a three-phase AC. A DC power capacitor, wherein the DC filter capacitor comprises a positive electrode side and a negative electrode side.
The DC filter reactor is formed by connecting two capacitors in series.
An output line formed by connecting three output lines of the three-phase alternating current of the inverter circuit via capacitors connected to the respective reactors, a midpoint of the two capacitors, A vehicle power supply device connected to a middle point of a secondary winding of a transformer. 4. A vehicle power supply having a DC-DC converter circuit having a transformer, a DC filter reactor connected in series to an output stage thereof, and an inverter circuit for converting the output of the DC filter into a three-phase AC. In the apparatus, the secondary winding of the transformer is formed by two secondary windings on a positive electrode side and a negative electrode side, and is connected to respective output stages of the two secondary windings. Two rectifiers are connected in series, and the DC filter reactor has two positive and negative electrode sides.
An output line formed by three reactors, wherein each output line of the three-phase alternating current of the inverter circuit is connected via a capacitor connected to each of the three output lines, and an output line is connected to a middle point of the two rectifiers. Power supply for vehicles. 5. A DC-DC converter circuit having a transformer, a DC filter reactor connected in series to its output stage, a DC filter capacitor connected in parallel, and an output of the DC filter converted to a three-phase AC. And a secondary winding of the transformer is formed by two secondary windings on a positive electrode side and a negative electrode side. Two rectifiers are connected in series to the respective output stages, and the DC filter capacitor comprises two positive and negative side capacitors.
The DC filter reactor is formed by connecting two capacitors in series.
An output line formed by three reactors, and connected to each output line of the three-phase AC of the inverter circuit via a capacitor connected to each of the three lines.
A power supply device for a vehicle, wherein the power supply device is connected to a midpoint between the two rectifiers and a midpoint between the two capacitors.