Controller for providing PWM drive to an A.C. motor

Details Controller for providing PWM drive to an A.C. motor Controller for providing PWM drive to an A.C. motor

1984-07-09

1986-03-11

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

323282, 323286, H02P 540

Patent

active

045756686

ABSTRACT:
A controller for providing PWM drive to an inductive load incorporating an input rectifier bridge (24) the output of which is filtered by capacitors (106, 108) and which includes input impedance (116, 118) for limiting start-up current surges. A by-pass network (124) controlled from a high voltage sensor circuit (32) controls the by-pass network. The sensor circuit also provides an enablement signal (40) to a pulse width modulation circuit (42). A low voltage power supply (36) is coupled with the output (26) of the rectifier and filter function (24) to supply isolated power to the discrete driver networks of a driver circuit (48). The driver networks are controlled from the pulse width modulation circuit which, in turn, is controlled from a microprocessor (68). The drivers provide drive to three, phase designated transistor pairs of an inverter switching bridge (50) which is supplied power from the rectifier and filter circuit (24).

REFERENCES:
patent: 3585491 (1971-06-01), Petersen
patent: 3967173 (1976-06-01), Stich
patent: 4030024 (1977-06-01), Chambers
patent: 4123682 (1978-10-01), Gilmore et al.
patent: 4233558 (1980-11-01), Gaertner
patent: 4307440 (1981-12-01), Inoue et al.
patent: 4409534 (1983-10-01), Bose
patent: 4420700 (1983-12-01), Fay et al.
patent: 4458199 (1984-07-01), Evans et al.
patent: 4491768 (1985-01-01), Slicker
patent: 4508976 (1985-04-01), Hickman et al.

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