# US 2014/0192573 A1 · Power conversion circuit

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- Number: US 2014/0192573 A1
- Document ID: US20140192573A1
- Status: Published application
- Kind: A1
- Application number: 14/204,624
- Filed: 2014-03-11
- Published: 2014-07-10
- Earliest claimed: 2010-05-07
- Assignees: Mitsubishi Electric Corporation
- Applicants: Mitsubishi Electric Corporation
- Inventors: Mitsuharu TABATA
- Web page: https://patentgrep.com/patent/US20140192573A1

## CPC

- H02M 7/538: in a push-pull configuration (H02M7/5375 takes precedence {; with oscillating arrangements H02M7/53832, H02M7/53846})
- H02M 1/348: {Passive dissipative snubbers}
- 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 circuit includes a high side switching device connected at its collector to the high potential side of a power supply, a low side switching device connected at its emitter to the lowpotential side of the power supply, a first junction to which the emitter of the high side switching device and the collector of the low side switching device are connected, a first diode connected at its cathode to the collector of the high side switching device, a second diode connected at its anode to the emitter of the low side switching device, a second junction to which the anode of the first diode and the cathode of the second diode are connected, an inductance connected between the first and second junctions, and a snubber circuit connected to the first junction and adapted to absorb stored energy in the inductance when a freewheeling current flows.

## Claims

### Claim 1

A power conversion circuit comprising:
a high side switching device connected at its collector to the high potential side of a power supply;
a low side switching device connected at its emitter to the low potential side of said power supply;
a first junction to which the emitter of said high side switching device and the collector of said low side switching device are connected;
a first diode connected at its cathode to said collector of said high side switching device;
a second diode connected at its anode to said emitter of said low side switching device;
a second junction to which the anode of said first diode and the cathode of said second diode are connected;
an inductance connected between said first and second junctions; and
a snubber circuit connected to said first junction and adapted to absorb stored energy in said inductance when a freewheeling current flows in said power conversion circuit.

### Claim 2 (depends on 1)

The power conversion circuit according to claim 1, wherein said snubber circuit includes:
a low side capacitor connected between said collector and said emitter of said low side switching device;
a low side resistance connected in parallel with said low side capacitor;
a high side capacitor connected between said collector and said emitter of said high side switching device; and
a high side resistance connected in parallel with said high side capacitor.

### Claim 3 (depends on 2)

The power conversion circuit according to claim 2, wherein:
said high side capacitor and said emitter of said high side switching device are connected at a third junction; and
a power loss reduction inductance is connected between said first and third junctions.

### Claim 4 (depends on 1)

The power conversion circuit according to claim 1, wherein said snubber circuit includes:
a first small size diode smaller than said first diode and connected at its cathode to said cathode of said first diode and at its anode to said first junction; and
a second small size diode smaller than said second diode and connected at its anode to said anode of said second diode and at its cathode to said first junction.

### Claim 5 (depends on 1)

The power conversion circuit according to claim 1, wherein said snubber circuit includes:
a first zener diode connected at its cathode to said first junction and at its anode to said cathode of said first diode; and
a second zener diode connected at its anode to said first junction and at its cathode to said anode of said second diode.

### Claim 6 (depends on 1)

The power conversion circuit according to claim 1, further comprising an AC switch connected to said first junction so as to supply a potential to said first junction.