# US 2021/0281188 A1 · Power conversion device

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- Number: US 2021/0281188 A1
- Document ID: US20210281188A1
- Status: Published application
- Kind: A1
- Application number: 16/343,508
- Filed: 2016-10-26
- Published: 2021-09-09
- Earliest claimed: 2016-10-26
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Naoya YABUUCHI
- Web page: https://patentgrep.com/patent/US20210281188A1

## CPC

- H02M 3/33553: {with galvanic isolation between input and output of both the power stage and the feedback loop}
- H02M 7/06: using discharge tubes without control electrode or semiconductor devices without control electrode
- H02M 1/14: Arrangements for reducing ripples from DC input or output
- H02M 7/003: {Constructional details, e.g. physical layout, assembly, wiring or busbar connections}
- H02M 1/0064: {Magnetic structures combining different functions, e.g. storage, filtering or transformation}
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)

## Abstract

A power conversion device includes a transformer circuit formed of a center-tapped isolation transformer, a rectifying circuit formed of a semiconductor switch element connected to the transformer circuit, a smoothing circuit formed of a capacitor connected to the rectifying circuit, a positive terminal and a negative terminal connected to a load, and a grounding surface to which the negative terminal is connected, wherein a current path along which only an AC current flows is shortened by a negative terminal of the isolation transformer and a negative terminal of the capacitor being connected before being connected to the grounding surface, or the negative terminal connected to the load and the negative terminal of the capacitor being connected before being connected to the grounding surface.

## Claims

### Claim 1

A power conversion device, comprising:
a transformer circuit formed of a center-tapped isolation transformer;
a rectifying circuit formed of a semiconductor switch element connected to the transformer circuit;
a smoothing circuit formed of a capacitor connected to the rectifying circuit;
a positive terminal and a negative terminal connected to a load; and
a grounding surface to which the negative terminal of the load is connected, wherein
a negative terminal of the isolation transformer and a negative terminal of the capacitor are connected before being connected to the grounding surface, or the negative terminal of the capacitor and the negative terminal connected to the load are connected before being connected to the grounding surface.

### Claim 2 (depends on 1)

The power conversion device according to claim 1, wherein the capacitor and the isolation transformer are integrally formed.

### Claim 3 (depends on 1)

The power conversion device according to claim 1, wherein there are two or more of the isolation transformer.

### Claim 4 (depends on 1)

The power conversion device according to claim 1, wherein two or more of the capacitor are connected with respect to one of the isolation transformer.

### Claim 5 (depends on 1)

The power conversion device according to claim 1, wherein the negative terminal of the isolation transformer and the negative terminal of the capacitor, or the negative terminal of the capacitor and the negative terminal connected to the load, are directly connected.

### Claim 6 (depends on 1)

The power conversion device according to claim 1, wherein the negative terminal of the isolation transformer and the negative terminal of the capacitor, or the negative terminal of the capacitor and the negative terminal connected to the load, are connected via a bus bar.

### Claim 7 (depends on 1)

The power conversion device according to claim 1, wherein the negative terminal of the isolation transformer and the negative terminal of the capacitor, or the negative terminal of the capacitor and the negative terminal connected to the load, are connected via a harness.

### Claim 8 (depends on 1)

The power conversion device according to claim 1, wherein the negative terminal of the isolation transformer and the negative terminal of the capacitor, or the negative terminal of the capacitor and the negative terminal connected to the load, are connected via a substrate pattern.

### Claim 9 (depends on 3)

The power conversion device according to claim 3, wherein two or more of the isolation transformer are connected in series.

### Claim 10 (depends on 3)

The power conversion device according to claim 3, wherein two or more of the isolation transformer are connected in parallel.

### Claim 11 (depends on 4)

The power conversion device according to claim 4, wherein two or more of the capacitor are connected in series.

### Claim 12 (depends on 4)

The power conversion device according to claim 4, wherein two or more of the capacitor are connected in parallel.

### Claim 13 (depends on 11)

The power conversion device according to claim 11, wherein two or more of the capacitor are configured of differing capacities.

### Claim 14 (depends on 1)

The power conversion device according to claim 1, wherein the semiconductor switch element is a wide-bandgap semiconductor.