Method and apparatus for controlling a-c power by means of thyri

Details Method and apparatus for controlling a-c power by means of thyri Method and apparatus for controlling a-c power by means of thyri

1989-01-26

1990-02-13

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219508, 219483, 219492, 323319, H05B 102

Patent

active

049009001

ABSTRACT:
A method of controlling a-c power by means of thyristors for resistive electric furnace for achieving a temperature control thereof, comprises providing an output which varies between O and N cycles in response to an input analog signal which also varies between 0 and 100% by a burn-on and -off control at zero crossings of an a-c power source. According to the invention, the output is uniformly distributed throughout a control period comprising N cycle times. The output pattern is transit to another output pattern in response to a new analog input signal at the desired point in time.

REFERENCES:
patent: 4340807 (1987-07-01), Raskin et al.
patent: 4377739 (1983-03-01), Eckert, Jr. et al.
patent: 4400613 (1983-08-01), Popelish
patent: 4518839 (1985-05-01), Taguchi et al.
patent: 4645908 (1987-02-01), Jones
patent: 4672540 (1987-06-01), Waugh et al.

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