Frequency-variable pulse-width-modulation motor drive...

Details Frequency-variable pulse-width-modulation motor drive... Frequency-variable pulse-width-modulation motor drive...

2007-09-04

2007-09-04

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Armature winding circuits

C318S254100, C318S721000

Reexamination Certificate

active

11386673

ABSTRACT:
A frequency-variable PWM motor drive circuit includes a drive IC member, a Hall IC member, a PWM converter circuit and a compensation unit. The drive IC member electrically connects with the Hall IC member, the drive IC member further includes a pin electrically connected with the compensation unit and the PWM converter circuit. The PWM converter circuit has a PWM input pin to receive a PWM signal, and converts it into a voltage signal. The compensation unit connects between the pin of the drive IC member and the PWM converter circuit. In operation, the compensation unit can improve a waveform of the voltage signal supplied from the PWM converter circuit, and then output it to the pin of the drive IC member. Consequently, the drive IC member can be steadily operated at predetermined motor speeds under various frequencies of the PWM signals.

REFERENCES:
patent: 3899725 (1975-08-01), Plunkett
patent: 4143311 (1979-03-01), Lee
patent: 6181092 (2001-01-01), Turner
patent: 6690135 (2004-02-01), Mir et al.
patent: 6891346 (2005-05-01), Simmons et al.
patent: 2001/0015633 (2001-08-01), Nishimura et al.
patent: 2002/0024313 (2002-02-01), Cho et al.
patent: 2002/0074969 (2002-06-01), Edelson
patent: 2002/0158600 (2002-10-01), Seima et al.

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