Load control device for an AC circuit

Details Load control device for an AC circuit Load control device for an AC circuit

1997-08-01

1999-09-28

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Phase controlled switching using electronic tube or a three...

323242, 323288, G05F 110, G05F 140

Patent

active

059594403

ABSTRACT:
A motor controlling device for controlling the rotational speed of an AC motor (3) connected with an AC power supply (1) through a speed control thyrister (2) includes a negative charging circuit (5) for charging a negative half cycle voltage of the AC power supply (1) in a negative direction for each cycle to trigger the thyrister (2) in a positive half cycle period of the AC power supply (1), and a positive charging circuit (6) for charging a positive half cycle voltage of the AC power supply (1) in a positive direction from the end of the negative half cycle by the negative charging circuit (5) for each cycle to trigger the thyrister (2) when the charged voltage reaches a trigger voltage of the thyrister (2).

REFERENCES:
patent: 3241043 (1966-03-01), Clarke
patent: 3619656 (1971-11-01), Domke
patent: 3646439 (1972-02-01), Broski
patent: 3896369 (1975-07-01), Nakata
patent: 4668908 (1987-05-01), Aoki et al.
patent: 4743834 (1988-05-01), Rice

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