Motor control circuit for regulating a D.C. motor

Details Motor control circuit for regulating a D.C. motor Motor control circuit for regulating a D.C. motor

1998-12-23

2000-02-15

Ro, Bentsu

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318139, 318258, 388937, H02P 517

Patent

active

060256834

ABSTRACT:
A motor control chip (62) for asserting the control signals used to regulate the energization of the windings of a DC motor. The motor control chip includes a tachometer (94) that receives pulsed signals that vary with the rotation of the motor rotor and that produces a pulse width modulated tachometer signal as a function of the motor speed. A pulse width modulator (90) receives the tachometer signal and an analog signal representative of the user-selected motor speed. Based on the received input signals, the pulse width modulator produces a variable speed control signal. A forward/reverse oscillator (92) receives user-set signals indicating if the motor should be run in the forward or reverse directions or in an oscillatory pattern. Based on the received signals, the forward/reverse oscillator asserts a forward/reverse signal having an appropriate signal state or cycle. A motor decoder (98) receives the signals produced by the pulse width oscillator and the forward/reverse oscillator. The motor decoder then asserts the control signals that regulate when power switches selectively tie the motor windings to either a power source or ground.

REFERENCES:
patent: 4047083 (1977-09-01), Plunkett
patent: 4292577 (1981-09-01), Cesarz et al.
patent: 4327315 (1982-04-01), Kawada et al.
patent: 4727305 (1988-02-01), Muskovac et al.
patent: 5173651 (1992-12-01), Buckley et al.
patent: 5747953 (1998-05-01), Philipp
Micrel, MPD8021, component specifications, pp. 17-20 and 22 May, 1997, Micrel, Inc., San Jose, CA 95131-1724.

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