Load drive apparatus

Details Load drive apparatus Load drive apparatus

2007-04-05

2009-11-03

Donels, Jeffrey (Department: 2832)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S400240, C318S629000, C318S724000

Reexamination Certificate

active

07612511

ABSTRACT:
A load drive apparatus includes a noise filter, which includes a coil connected in series between a power source and a load, and a switching transistor connected in parallel across the coil, and a control circuit which is operated based on a drive signal. The control circuit turns on the switching transistor of the noise filter in case of subjecting the load to a full-on drive, thereby to short-circuit the coil and to form a power supply path including the switching transistor without the coil. The control circuit turns off the switching transistor of the noise filter in case of subjecting the load to a PWM drive, thereby to form a power supply path including the coil.

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patent: A-05-260728 (1993-10-01), None
patent: A 2001-23809 (2001-01-01), None
patent: A 2001-23811 (2001-01-01), None

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