Power conversion device and control device

Patent metadata

Field	Value
Publication number	US-10033266-B2
Application number	US-201515119742-A
Country	US
Kind code	B2
Filing date	Feb 19, 2015
Priority date	Mar 3, 2014
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

A power conversion device includes: a bridge circuit; a filter provided on an alternating current side of the bridge circuit, and connected to a neutral point; a reactor between the bridge circuit and the filter; a smoothing circuit provided on a direct current side of the bridge circuit; a snubber circuit between the bridge circuit and the smoothing circuit; and a switch circuit provided between the smoothing circuit and the snubber circuit. The smoothing circuit includes two smoothing capacitors connected in series between a positive line and a negative line. The neutral point is connected between the two smoothing capacitors. The snubber circuit includes two snubber capacitors connected in series between the positive line and the negative line. The neutral point is connected between the two snubber capacitors. The switch circuit includes a first switch provided on the positive line and a second switch provided on the negative line.

First claim

The invention claimed is:

1. A power conversion device comprising:
a bridge circuit in which a switch element is provided in each of a plurality of arms;
a filter that is provided on an alternating current side of the bridge circuit, and connected to a neutral point;
a reactor provided between the bridge circuit and the filter;
a smoothing circuit provided on a direct current side of the bridge circuit;
a snubber circuit provided between the bridge circuit and the smoothing circuit; and
a switch circuit provided between the smoothing circuit and the snubber circuit,
wherein
the smoothing circuit comprises a first smoothing capacitor and a second smoothing capacitor connected in series between a positive line and a negative line,
the neutral point is connected between the first and second smoothing capacitors,
the snubber circuit comprises a first snubber capacitor and a second snubber capacitor connected in series between the positive line and the negative line, a first diode connected in parallel with the first snubber capacitor, and a second diode connected in parallel with the second snubber capacitor,
the neutral point is connected between the first and second snubber capacitors and the first and second diodes, and
the switch circuit comprises a first switch provided on the positive line and a second switch provided on the negative line.

2. The power conversion device according to claim 1 , wherein current is discontinuously passed through the reactor.

3. The power conversion device according to claim 2 , wherein
the switch elements of the bridge circuit are driven with different duty ratios,
the first switch is turned on when one of the switch elements of an upper arm in the bridge circuit is initially turned on in each switching cycle, and the second switch is turned on when one of the switch elements of a lower arm in the bridge circuit is initially turned on in each switching cycle.

4. The power conversion device according to claim 2 , wherein the switch element of the bridge circuit is turned off while the first and second snubber capacitors are discharged.

5. The power conversion device according to claim 3 , wherein the switch element of the bridge circuit is turned off while the first and second snubber capacitors are discharged.

6. The power conversion device according to claim 1 , wherein
the switch elements of the bridge circuit are driven with different duty ratios,
the first switch is turned on when one of the switch elements of an upper arm in the bridge circuit is initially turned on in each switching cycle, and
the second switch is turned on when one of the switch elements of a lower arm in the bridge circuit is initially turned on in each switching cycle.

7. The power conversion device according to claim 6 , wherein the switch element of the bridge circuit is turned off while the first and second snubber capacitors are discharged.

8. The power conversion device according to claim 1 , wherein the switch element of the bridge circuit is turned off while the first and second snubber capacitors are discharged.

9. A control device configured to control a power conversion device,
wherein
the power conversion device comprises:
a bridge circuit in which a switch element is provided in each of a plurality of arms;
a filter that is provided on an alternating current side of the bridge circuit, and connected to a neutral point;
a reactor provided between the bridge circuit and the filter;
a smoothing circuit provided on a direct current side of the bridge circuit;
a snubber circuit provided between the bridge circuit and the smoothing circuit; and
a switch circuit provided between the smoothing circuit and the snubber circuit,
the smoothing circuit comprises a first smoothing capacitor and a second smoothing capacitor connected in series between a positive line and a negative line,
the neutral point is connected between the first and second smoothing capacitors,
the snubber circuit comprises a first snubber capacitor and a second snubber capacitor connected in series between the positive line and the negative line, a first diode connected in parallel with the first snubber capacitor, and a second diode connected in parallel with the second snubber capacitor,
the neutral point is connected between the first and second snubber capacitors and the first and second diodes,
the switch circuit comprises a first switch provided on the positive line and a second switch provided on the negative line, and
the control device is configured to control the bridge circuit and the switch circuit based on an input voltage, an input current, and an output voltage of the power conversion device.

Assignees

• Omron Tateisi Electronics Co

Inventors

• Hyodo Takashi
• Kato Shuhei

Classifications

• H02M7/219

  in a bridge configuration · CPC title

• H02M1/34

  Snubber circuits · CPC title

• H02M1/4233 Primary

  using a bridge converter comprising active switches · CPC title

• Y02P80/112

  Cross-Sectional Technologies · mapped topic

• Y02B70/126

  Cross-Sectional Technologies · mapped topic