# US 9,438,135 B2 · Electric power converter including a stabilization circuit

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- Number: US 9,438,135 B2
- Document ID: US9438135B2
- Status: Granted
- Kind: B2
- Application number: 13/879,937
- Filed: 2011-01-07
- Published: 2013-08-15
- Granted: 2016-09-06
- Earliest claimed: 2011-01-07
- Assignees: Toshiba Mitsubishi-Electric Industrial Systems Corporation
- Applicants: Masahiro Kinoshita
- Inventors: Masahiro Kinoshita
- Web page: https://patentgrep.com/patent/US9438135B2

## CPC

- H02M 7/537: using semiconductor devices only, e.g. single switched pulse inverters
- H02M 1/14: Arrangements for reducing ripples from DC input or output
- H02M 5/458: using semiconductor devices only
- H02M 7/53871: {with automatic control of output voltage or current}
- 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

An electric power converter includes a DC stabilization circuit configured to stabilize a DC voltage from DC power supply, and an inverter configured to convert the DC voltage stabilized by the DC stabilization circuit to an AC voltage. The DC stabilization circuit includes an aluminum electrolytic capacitor configured to smooth the DC voltage, a saturable reactor configured to prevent the DC stabilization circuit from oscillating, and a film capacitor configured to supply a ripple current to the inverter.

## Claims

### Claim 1

An electric power converter configured to convert DC power to AC power, comprising:
a DC stabilization circuit configured to stabilize a DC voltage from DC power supply; and
an inverter configured to convert the DC voltage stabilized by said DC stabilization circuit to an AC voltage,
said DC stabilization circuit including:
first and second input terminals configured to receive the DC voltage from said DC power supply;
first and second output terminals connected to said inverter;
a smoothing capacitor connected between said first and second input terminals and configured to smooth the DC voltage between said first and second input terminals;
a saturable reactor connected between said first and second input terminals and said first and second DC output terminals, and configured to prevent said DC stabilization circuit from oscillating; and
a film capacitor connected between said first and second DC output terminals and configured to supply a ripple current to said inverter, wherein
said saturable reactor includes a first coil connected between said first DC output terminal and said first input terminal and a second coil connected between said second input terminal and said second DC output terminal, and
said first and second coils are mutually magnetically coupled.

### Claim 2 (depends on 1)

The electric power converter according to claim 1, wherein said smoothing capacitor is an electrolytic capacitor.

### Claim 3 (depends on 1)

The electric power converter according to claim 1, wherein said smoothing capacitor is an electric double layer capacitor.

### Claim 4 (depends on 1)

The electric power converter according to claim 1, wherein said smoothing capacitor has a capacitance value larger than that of said film capacitor.

### Claim 5 (depends on 1)

The electric power converter according to claim 1, wherein said DC stabilization circuit further includes a fuse having one terminal connected to said first input terminal and the other terminal connected via said first coil to said first DC output terminal.