Starting circuit for single phase electric motors

Details Starting circuit for single phase electric motors Starting circuit for single phase electric motors

1981-09-08

1982-12-28

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318785, H02P 142

Patent

active

043664261

ABSTRACT:
A time responsive switching circuit for use with a single phase alternating current motor comprises a Triac in series with a start winding of the motor and controlled so as to disconnect the start winding after a predetermined time delay. The Triac is controlled by a timing circuit comprising a full wave rectifier bridge energized from the alternating current source, an RC charging network connected across the d.c. terminals of the bridge, a CMOS switching device responsive to the condition of the charging circuit, and an SCR controlled by the CMOS switching device. The SCR is switched off by the CMOS switching device after the chosen delay so as to remove the control potential from the Triac and so switch off the latter.

REFERENCES:
patent: 3671830 (1972-06-01), Kruper
patent: 3740631 (1973-06-01), Fricker et al.
patent: 3819994 (1974-06-01), Ballman
patent: 3819995 (1974-06-01), Ballman

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