Apparatus for automatic regulation of AC power

Details Apparatus for automatic regulation of AC power Apparatus for automatic regulation of AC power

1980-10-29

1982-08-24

Pellinen, A. D.

Electricity: power supply or regulation systems

Output level responsive

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

219494, 307364, 323300, G05F 1455

Patent

active

043463398

ABSTRACT:
A closed loop phase control circuit. The circuit senses the temperature of a load circuit. It also senses the line voltage on each line of a multi-phase system. The sensed line voltage is full-wave rectified. Comparators for each phase compare an input signal indicative of the temperature of the load circuit with the full-wave rectified line voltage in the corresponding phase and develops an output signal when the full-wave rectified line voltage exceeds the input signal indicative of the temperature of the load circuit. Ultimately, triacs, which are in series with the load for each phase, respond to the existence of an output signal from the corresponding comparators and to a pulse from a timer and conduct in response thereto. When a triac conducts, line current is delivered to its corresponding load resistance. In this way, the time for delivery of line current (and line voltage) to the load resistance varies in accordance with the temperature of the load. Therefore, power to the load resistance is regulated in accordance with the thermal condition of the load resistance. A set point temperature at the load is thereby maintained.

REFERENCES:
patent: 3684172 (1972-03-01), Evalds
patent: 3805184 (1974-04-01), Visioli et al.
patent: 3860169 (1975-01-01), Norman
patent: 3924102 (1975-12-01), Hanekom
patent: 4078393 (1978-03-01), Wills
patent: 4122384 (1978-10-01), Suzuki

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