Apparatus for preventing phase control mechanism malfunction

Details Apparatus for preventing phase control mechanism malfunction Apparatus for preventing phase control mechanism malfunction

1981-10-23

1983-10-11

Shoop, William M.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

318803, 363 87, H02H 7125

Patent

active

044096488

ABSTRACT:
An apparatus for preventing malfunctions in a phase control mechanism of the type in which the firing angle of thyristors in a thyristor bridge is controlled to regulate the rotational speed of a DC motor comprising the load of the thyristor bridge. Thyristor firing pulses are produced each time a rising analog speed command signal generated in response to the phases of a N-phase power supply intersects N-number of sawtooth signals. Immediately after the generation of each firing pulse, the thyristors are not supplied with firing pulses for a time interval at least equivalent to the thyristor commutation overlap time.

REFERENCES:
patent: 3304486 (1967-02-01), Michaels
patent: 3579079 (1971-05-01), Kelly, Jr.
patent: 3671836 (1972-06-01), Kolatorwicz et al.
patent: 3746966 (1973-07-01), Torok et al.
patent: 4128869 (1978-12-01), Ermolovich et al.
patent: 4184086 (1980-01-01), Sagawa et al.

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