Motor drive with silicon carbide mosfet switches

Patent metadata

Field	Value
Publication number	US-2018145602-A1
Application number	US-201815861121-A
Country	US
Kind code	A1
Filing date	Jan 3, 2018
Priority date	May 5, 2014
Publication date	May 24, 2018
Grant date	—

Abstract

Motor drive power conversion systems, including a filter circuit with a single inductor and a capacitor for each input phase, an active rectifier with silicon carbide rectifier switching devices and no precharge circuitry, a DC bus circuit with a film DC bus capacitor, an inverter to drive a load, and a controller to operate the rectifier switching devices at a PWM rectifier switching frequency of 10 kHz or more.

First claim

The following is claimed:

1 . A power conversion system, comprising:
a filter circuit, including a filter input to receive an AC input signal from an external power source, and a filter output to provide a filtered AC output signal; an active rectifier, including a plurality of silicon carbide rectifier switching devices coupled with the filter output and operative to convert the filtered AC output signal to provide a DC output signal according to a plurality of rectifier switching control signals; a DC bus circuit, including first and second DC bus terminals to receive the DC output signal from the rectifier, and a DC bus capacitor coupled between the first and second DC bus terminals; an inverter including a plurality of inverter switching devices coupled with the DC bus circuit and operative to convert the DC output signal to provide an AC output signal to drive a load according to a plurality of inverter switching control signals; and a controller configured to generate the rectifier switching control signals to operate the rectifier switching devices at a PWM rectifier switching frequency of 10 kHz or more.

2 . The power conversion system of claim 1 , wherein the DC bus capacitor is a film capacitor.

3 . The power conversion system of claim 2 , wherein the AC input signal includes an integer number N phases, wherein the filter circuit includes N filter input lines, N filter output lines, and N filter stages individually associated with a corresponding one of the N phases, wherein each filter stage consists of a single inductor with a first terminal connected to the corresponding filter input and a second terminal connected to the corresponding filter output, and a capacitor connected to the corresponding filter input, and wherein N is greater than or equal to 1.

4 . The power conversion system of claim 3 , wherein the controller is configured to generate the rectifier switching control signals to operate the rectifier switching devices at a PWM rectifier switching frequency of 20 kHz or more and about 40 kHz or less.

5 . The power conversion system of claim 4 , wherein the active rectifier is configured to precharge the DC bus capacitor without any precharging circuitry.

6 . The power conversion system of claim 1 , wherein the AC input signal includes an integer number N phases, wherein the filter circuit includes N filter input lines, N filter output lines, and N filter stages individually associated with a corresponding one of the N phases, wherein each filter stage consists of a single inductor with a first terminal connected to the corresponding filter input and a second terminal connected to the corresponding filter output, and a capacitor connected to the corresponding filter input, and wherein N is greater than or equal to 1.

7 . The power conversion system of claim 6 , wherein the controller is configured to generate the rectifier switching control signals to operate the rectifier switching devices at a PWM rectifier switching frequency of 20 kHz or more and about 40 kHz or less.

8 . The power conversion system of claim 6 , wherein the active rectifier is configured to precharge the DC bus capacitor without any precharging circuitry.

9 . The power conversion system of claim 1 , wherein the controller is configured to generate the rectifier switching control signals to operate the rectifier switching devices at a PWM rectifier switching frequency of 20 kHz or more and about 40 kHz or less.

10 . The power conversion system of claim 1 , wherein the active rectifier is configured to precharge the DC bus capacitor without any precharging circuitry.

11 . The power conversion system of claim 1 , wherein the AC input signal includes 3 phases, wherein the filter circuit includes 3 filter input lines, 3 filter output lines, and 3 filter stages individually associated with a corresponding one of the 3 phases, wherein each filter stage consists of a single inductor with a first terminal connected to the corresponding filter input and a second terminal connected to the corresponding filter output, and a capacitor connected to the corresponding filter input.

12 . A power conversion system, comprising:
a filter circuit, including a filter input to receive an AC input signal from an external power source, and a filter output to provide a filtered AC output signal; an active rectifier, including a plurality of silicon carbide rectifier switching devices coupled with the filter output and operative to convert the filtered AC output signal to provide a DC output signal according to a plurality of rectifier switching control signals; a DC bus circuit, including first and second DC bus terminals to receive the DC output signal from the rectifier, and a DC bus capacitor coupled between the first and second DC bus terminals, the DC bus capacitor being a film capacitor; and an inverter including a plurality of inverter switching devices coupled with the DC bus circuit and operative to convert the DC output signal to provide an AC output signal to drive a load according to a plurality of inverter switching control signals.

13 . The power conversion system of claim 12 , wherein the AC input signal includes an integer number N phases, wherein the filter circuit includes N filter input lines, N filter output lines, and N filter stages individually associated with a corresponding one of the N phases, wherein each filter stage consists of a single inductor with a first terminal connected to the corresponding filter input and a second terminal connected to the corresponding filter output, and a capacitor connected to the corresponding filter input, and wherein N is greater than or equal to 1.

14 . The power conversion system of claim 13 , wherein the active rectifier is configured to precharge the DC bus capacitor without any precharging circuitry.

15 . The power conversion system of claim 12 , wherein the active rectifier is configured to precharge the DC bus capacitor without any precharging circuitry.

16 . The power conversion system of claim 12 , wherein the AC input signal includes 3 phases, wherein the filter circuit includes 3 filter input lines, 3 filter output lines, and 3 filter stages individually associated with a corresponding one of the 3 phases, wherein each filter stage consists of a single inductor with a first terminal connected to the corresponding filter input and a second terminal connected to the corresponding filter output, and a capacitor connected to the corresponding filter input.

17 . A power conversion system, comprising:
a filter circuit, including a filter input to receive an AC input signal from an external power source, and a filter output to provide a filtered AC output signal, wherein the AC input signal includes an integer number N phases, wherein the filter circuit includes N filter input lines, N filter output lines, and N filter stages individually associated with a corresponding one of the N phases, wherein N is greater than or equal to 1, wherein each filter stage consists of a single inductor with a first terminal connected to the corresponding filter input and a second terminal connected to the corresponding filter output, and a capacitor connected to the corresponding filter input; an active rectifier, including a plurality of silicon carbide rectifier switching devices coupled with the filter output and operative to convert the filtered AC output signal to provide a DC output signal according to a plurality of rectifier switching control signals; a DC bus circuit, including first and second DC bus terminals to receive the D

Assignees

• Rockwell Automation Tech Inc

Inventors

• Wei Lixiang
• Yi Peizhong
• Roberts Andrew Joseph
• Savatski Robert Allen

Classifications

• H02M5/458 Primary

  using semiconductor devices only · CPC title

• Y02B70/1483

  Cross-Sectional Technologies · mapped topic

• H02P27/06

  using DC to AC converters or inverters (H02P27/05 takes precedence) · CPC title

• H02M1/08

  Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters · CPC title

• H02M5/4585

  having a rectifier with controlled elements · CPC title