Multi-inverter electronic motor controller

Patent metadata

Field	Value
Publication number	US-10944349-B2
Application number	US-201716311889-A
Country	US
Kind code	B2
Filing date	Sep 8, 2017
Priority date	Aug 17, 2017
Publication date	Mar 9, 2021
Grant date	Mar 9, 2021

Abstract

The present disclosure discloses a multi-inverter electric motor controller, which solves the technical problem that the existing inverter with silicon-based devices cannot accurately modulate high-frequency currents. The multi-inverter electric motor controller comprises a primary inverter and one or more secondary inverters, where the primary inverter and the secondary inverters connect in parallel to a same electrical motor, the primary inverter employs silicon-material power electronic devices, the secondary inverters employ wide-bandgap semiconductor power electronic devices, and the switching frequency of the primary inverter is less than the switching frequencies of the secondary inverters. According to the present disclosure, the existing inverter with silicon-based devices and the inverters with wide-bandgap semiconductor devices are connected in parallel, and can complete the fine control of the harmonic waves of high-frequency currents.

First claim

What is claimed is:

1. A multi-inverter electric motor controller, wherein, the multi-inverter electric motor controller comprises a primary inverter and one or more secondary inverters, the primary inverter and the secondary inverters connect in parallel to a same electrical motor, the primary inverter employs silicon-material power electronic devices, the secondary inverters employ wide-bandgap semiconductor power electronic devices, and switching frequency of the primary inverter is less than the switching frequencies of the secondary inverters; and
the two or more inverters can work simultaneously, and together achieve combined output of larger currents and larger powers.

2. The multi-inverter electric motor controller according to claim 1 , wherein, the primary inverter comprises power electronic devices that use a silicon material, and the secondary inverters comprise power electronic devices that use a silicon carbide or gallium nitride material.

3. The multi-inverter electric motor controller according to claim 2 , wherein, the power electronic devices in the primary inverter comprises IGBT, MOSFET, diode or device module that is based on silicon material, and the power electronic devices in the secondary inverters comprises field effect transistor, diode or device module that is based on silicon carbide material, or transistor or diode that is based on a gallium nitride material.

4. The multi-inverter electric motor controller according to claim 1 , wherein, amplitude of currents outputted by the primary inverter is greater than those by the secondary inverters.

5. The multi-inverter electric motor controller according to claim 1 , wherein, the primary inverter is used to modulate a low-frequency current that is equal to or below 10 kHz, and the secondary inverters are used to modulate a high-frequency current above output frequency of the primary inverter.

6. The multi-inverter electric motor controller according to claim 1 , wherein, each output phase of the secondary inverters connects in series to an inductor and subsequently connects in parallel to an output phase of the primary inverter.

7. The multi-inverter electric motor controller according to claim 1 , wherein, both of phase numbers of the primary inverter and the secondary inverters are the same as the phase number of the electrical motor.

8. The multi-inverter electric motor controller according to claim 7 , wherein, the primary inverter and the secondary inverters are provided therein with bridge arms, each of which corresponds to one phase.

9. The multi-inverter electric motor controller according to claim 1 , wherein, housings of the primary inverter and the secondary inverters are separately provided, or manufactured integrally, or separately provided and then assembled together.

Assignees

• Jing Jin Electric Tech Co Ltd

Inventors

• Wang Zifu

Classifications

• H02P23/28 Primary

  Controlling the motor by varying the switching frequency of switches connected to a DC supply and the motor phases · CPC title

• H02P23/00 Primary

  Arrangements or methods for the control of AC motors characterised by a control method other than vector control · CPC title

• H02M7/493

  the static converters being arranged for operation in parallel · CPC title

• H02M1/0095

  Hybrid converter topologies, e.g. NPC mixed with flying capacitor, thyristor converter mixed with MMC or charge pump mixed with buck · CPC title

• H02M7/5387

  in a bridge configuration · CPC title