Circuit array for limiting a load current by reverse phase angle

Details Circuit array for limiting a load current by reverse phase angle Circuit array for limiting a load current by reverse phase angle

1993-03-10

1994-07-19

Stephan, Steven L.

Electricity: power supply or regulation systems

Output level responsive

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

323235, 323242, 323244, G05F 144

Patent

active

053312708

ABSTRACT:
A circuit array, adapted to be coupled to a load and a source of a main AC voltage, for reverse phase angle control whereby a current flow in the load is limited to a defined phase angle (.alpha.) of the main AC voltage, comprising the following components for sequential control of the reverse phase angle control: a switching element, connected to the load and coupled to the source of the main AC voltage, for actuating the current flow in the load; a time determining component; and an integrated circuit. The integrated circuit includes: an actuating circuit, connected to the time determining component, responsive to a first control signal for generating a ramp voltage, and responsive to a second control signal for selecting one of at least two predetermined temporal voltage curves for the ramp voltage; a synchronizing circuit, coupled to the source of the main AC voltage and connected to the actuating circuit, for detecting a zero crossing of the main AC voltage, for synchronizing the ramp voltage to the main AC voltage, and for generating the first control signal; an evaluation circuit, connected to the actuating circuit and the synchronizing circuit, for monitoring the ramp voltage during reverse phase angle control and for generating the second control signal and a third control signal; an output stage, connected between the evaluation circuit and the switching element, and responsive to the third control signal for controlling the switching element; and a voltage supply circuit.

REFERENCES:
patent: 4158164 (1979-06-01), Nutz
patent: 4507569 (1985-03-01), Hess
patent: 4528494 (1985-07-01), Bloomer
patent: 4567425 (1986-01-01), Bloomer
"Technische Rundschau" (Technical Review), vol. 66, No. 34, Jan. 01, 1974, Bern, CH, p. 25; Karl-D. Nutz Ein monolithisch integrierter Nullspannungsschalter (A monolithically integrated zero voltage switch).

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