Phase-regulated switching circuit

Details Phase-regulated switching circuit Phase-regulated switching circuit

1984-05-14

1986-03-04

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

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

323370, 323366, G05F 1455

Patent

active

045742308

ABSTRACT:
The present invention relates to a phase-regulated zero-crossover ac switching circuit. The present switching circuit comprises the components of (a) regulator having a time constant; (b) ac Wheatstone bridge connected with the regulator and amplifier, which bears in one arm a variable resistance; (c) amplifier for an unbalanced voltage generated in the Wheatstone bridge; (d) means for supplying dc energy to the regulator and amplifier; and (e) thyristor driven by the amplifier, wherein said components are connected in a manner such that said thyristor is not conducted at the moment when an ac power supply is coupled, and that the current through thyristor starts from a zero-crossover of ac sine wave and successively increases to the prescribed level within a period determined by the time constant of the regulator.

REFERENCES:
patent: 3421027 (1969-01-01), Maynard et al.
patent: 3624455 (1971-11-01), Hillman
patent: 4207516 (1980-06-01), Babcock
patent: 4220910 (1980-09-01), Chiba et al.
patent: 4467182 (1984-08-01), Merkel

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