AC motor drive device

Patent metadata

Field	Value
Publication number	US-9130500-B2
Application number	US-201113981473-A
Country	US
Kind code	B2
Filing date	Mar 28, 2011
Priority date	Mar 28, 2011
Publication date	Sep 8, 2015
Grant date	Sep 8, 2015

Abstract

A circuit disconnection element that can open or short-circuit between a power storage element and a step-up/step-down bidirectional chopper circuit is provided in a power storage system, thereby preventing a self-discharge state in a process of charging. Furthermore, at the time of occurrence of an abnormality, the power storage element is detached from other devices including the step-up/step-down bidirectional chopper circuit. Accordingly, an energy loss of the power storage element at the time of power regeneration can be reduced to improve the energy use efficiency. Further, breakage influences such that the power storage element causes breakage in other devices at the time of occurrence of the abnormality can be prevented, thereby enabling to obtain an AC motor drive device having mounted therein a highly safe power storage system.

First claim

The invention claimed is:

1. AC motors drive device comprising:
a DC power supply;
a DC bus connected to the DC power supply;
an inverter that converts DC power supplied from the DC bus to AC power required for driving an AC motor; and
a power storage system that is connected to the DC bus in parallel with the inverter to control DC power of the DC bus,
wherein the power storage system includes:
a power storage element that can store DC power;
a step-up/step-down bidire…

Assignees

• Ohashi Manabu
• Nakamura Kazuya
• Mitsubishi Electric Corp

Inventors

• Ohashi Manabu
• Nakamura Kazuya

Classifications

• H02P2201/07

  Electricity · mapped topic

• H02P27/06 Primary

  Electricity · mapped topic

• H02P3/22

  Electricity · mapped topic

• H02M1/32

  Electricity · mapped topic

• H02P2201/03

  Electricity · mapped topic