Temperature control method and circuit for controlling the tempe

Details Temperature control method and circuit for controlling the tempe Temperature control method and circuit for controlling the tempe

1988-06-03

1990-03-06

Paschall, M. H.

Electric heating

Heating devices

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

219501, 219505, 219494, 219491, 323237, 323244, H05B 102

Patent

active

049068202

ABSTRACT:
The invention relates to a temperature control method and to a temperature control circuit. In a measured value detecting member (2) a measuring voltage (U.sub.TH) is generated which is representative of the actual temperature. In an adjustment member (1), a desired voltage (U.sub.S) is generated which is representative of the desired temperature. A difference former (inverse adder 5) determines from the measuring voltage (U.sub.TH) and the desired voltage (U.sub.S) a deviation voltage (U.sub.D) which corresponds to the deviation between the desired temperature and the actual temperature. The heating power of the heating element (14) of the temperature control circuit is regulated proportionately in dependence on the deviation voltage (U.sub.D) by shifting the phase angle (.phi.). During each line half-wave (27), the deviation voltage (U.sub.D) is compared in a comparator (comparator 11) with the descending edge voltage of a line-synchronous delta voltage (U.sub.DS). Beginning with the point in time at which these two voltages (U.sub.D and U.sub.DS) are identical, the comparator (comparator 11) generates an output signal which controls the position of the phase angle (.phi.).

REFERENCES:
patent: 3946200 (1976-03-01), Juodikis
patent: 3961236 (1976-06-01), Rodek et al.
patent: 4093847 (1978-06-01), Walker et al.

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