Patent Number: 7,233,124

Title: Motor drive inverter control apparatus

Abstract: A motor drive inverter control apparatus includes a rectifier circuit for rectifying an AC power supply, an inverter circuit driven by an output from the rectifier circuit, a motor driven by an output from the inverter circuit, a first capacitor coupled in parallel to the output of the rectifier circuit, and a second capacitor coupled in parallel to the first capacitor via a diode. The second capacitor has capacitance not less than three times that of the first capacitor. Although the second capacitor shows a ripple content not less than 90% during practical use, it well absorbs regenerative energy produced by the motor. As a result, elements of the apparatus can be prevented from degrading caused by an over-voltage, and the apparatus can be downsized and reduced its cost.

Inventors: Takeoka; Yoshinori (Shiga, JP), Hamaoka; Koji (Osaka, JP)

Assignee: Matsushita Electric Industrial Co., Ltd.

International Classification: H02P 27/04 (20060101)

Expiration Date: 2019-06-19 0:00:00