# US 8,570,773 B2 · Power converter system and method

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- Number: US 8,570,773 B2
- Document ID: US8570773B2
- Status: Granted
- Kind: B2
- Application number: 12/787,900
- Filed: 2010-05-26
- Published: 2011-12-01
- Granted: 2013-10-29
- Earliest claimed: 2010-05-26
- Assignees: Rockwell Automation Technologies, Inc.
- Applicants: Gary L. Skibinski; Ahmed Mohamed Sayed Ahmed
- Inventors: Gary L. Skibinski; Ahmed Mohamed Sayed Ahmed
- Web page: https://patentgrep.com/patent/US8570773B2

## CPC

- H02M 5/458: using semiconductor devices only
- H02M 1/126: {using passive filters}
- H02M 1/123: {Suppression of common mode voltage or current}
- H02P 2209/01: Motors with neutral point connected to the power supply
- 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)
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

## Abstract

A three-phase power converter includes a converter configured to convert a three phase AC power input to a DC power output, the DC power output being provided to high and low sides of a DC bus, and an inverter coupled to the DC bus and configured to convert the DC power to a three phase AC output. The inverter comprises three legs and each leg comprises a pair of solid state switches and a respective output therebetween. The power converter further includes a common mode voltage control filter comprising three filter inputs and two filter outputs, each filter input coupled to an output of a respective leg of the inverter and each filter output coupled to a respective side of the DC bus.

## Claims

### Claim 1

A three-phase power converter comprising:
a converter configured to convert a three phase AC power input to a DC power output, the DC power output being provided to high and low sides of a DC bus;
an inverter coupled to the DC bus and configured to convert the DC power to a three phase AC output, wherein the inverter comprises three legs and each leg comprises a pair of solid state switches and a respective output therebetween; and
a common mode voltage control filter comprising three filter inputs and two filter outputs, each filter input coupled to an output of a respective leg of the inverter and each filter output coupled to a respective side of the DC bus; the common mode voltage control filter comprising an inductor, a resistor, and a capacitor in series for each filter input.

### Claim 2 (depends on 1)

The three-phase power converter of claim 1, wherein the inductor, the resistor, and the capacitor comprise an LC filter.

### Claim 3 (depends on 1)

The three-phase power converter of claim 1, wherein the inductor, the resistor, and the capacitor comprise a notch filter.

### Claim 4 (depends on 1)

The three-phase power converter of claim 1, wherein the common mode voltage control filter is coupled to a capacitor network extending across the DC bus.

### Claim 5 (depends on 1)

The power converter of claim 1, wherein the each filter input is coupled to a respective leg of the inverter via an inductor.

### Claim 6 (depends on 1)

The power converter of claim 1, further comprising a precharge relay coupled to the high side of the DC bus.

### Claim 7

A three-phase power converter comprising:
a converter configured to convert a three phase AC power input to a DC power output, the DC power output being provided to high and low sides of a DC bus;
an inverter coupled to the DC bus and configured to convert the DC power to a three phase AC output, wherein the inverter comprises three legs and each leg comprises a pair of solid state switches and a respective output therebetween; and
a common mode voltage control filter comprising three filter inputs and two filter outputs, each filter input coupled to an output of a respective leg of the inverter and each filter output coupled to a respective side of the DC bus; the common mode voltage control filter comprising an inductor, a resistor, and a capacitor in series for each filter input; wherein the common mode voltage control filter is coupled to a capacitor network extending across the DC bus.

### Claim 8 (depends on 7)

The three-phase power converter of claim 7, wherein the capacitor network is coupled to a common node of the inductor, the resistor, and the capacitor in series for each filter input.

### Claim 9 (depends on 7)

The three-phase power converter of claim 7, wherein the inductor, the resistor, and the capacitor comprise an LC filter.

### Claim 10 (depends on 7)

The three-phase power converter of claim 7, wherein the inductor, the resistor, and the capacitor comprise a notch filter.

### Claim 11 (depends on 7)

The three-phase power converter of claim 7, wherein the capacitor network comprises at least two capacitors.

### Claim 12

A three-phase power converter comprising:
a converter configured to convert a three phase AC power input to a DC power output, the DC power output being provided to high and low sides of a DC bus;
an inverter coupled to the DC bus and configured to convert the DC power to a three phase AC output, wherein the inverter comprises three legs and each leg comprises a pair of solid state switches and a respective output therebetween; and
a common mode voltage control filter comprising three filter inputs and two filter outputs, each filter input coupled to an output of a respective leg of the inverter and each filter output coupled to a respective side of the DC bus; the common mode voltage control filter comprising an inductor, a resistor, and a capacitor in series for each filter input; wherein the common mode voltage control filter is coupled to a capacitor network extending across the DC bus, wherein the capacitor network comprises two capacitors and is coupled to a common node of the inductor, the resistor, and the capacitor in series for each filter input.

### Claim 13 (depends on 12)

The three-phase power converter of claim 12, wherein the inductor, the resistor, and the capacitor comprise an LC filter.

### Claim 14 (depends on 12)

The three-phase power converter of claim 12, wherein the inductor, the resistor, and the capacitor comprise a notch filter.

### Claim 15

A common mode voltage control filter adapted for use in a power converter system, the filter comprising:
three filter inputs and two filter outputs;
an inductor, a resistor, and a capacitor in series for each filter input; and
a capacitor network coupled to a common node of the inductor, the resistor, and the capacitor in series for each filter input.

### Claim 16 (depends on 15)

The common mode voltage control filter of claim 15, wherein the inductor, the resistor, and the capacitor comprise an LC filter.

### Claim 17 (depends on 15)

The common mode voltage control filter of claim 15, wherein the inductor, the resistor, and the capacitor comprise a notch filter.

### Claim 18 (depends on 15)

The common mode voltage control filter of claim 15, wherein the capacitor network comprises at least two capacitors.