Multiple variable phase control circuit

Electric heating – Heating devices – With power supply and voltage or current regulation or...

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Details

323 34, 219492, 219508, 219501, H05B 102

Patent

active

042257778

ABSTRACT:
A temperature control circuit for a point-of-use water heater comprises a pulse charging circuit which includes a summing capacitor provided with a residual charge thereon at the beginning of each half cycle of an a.c. supply. The residual charge on the summing capacitor determines the pedestal charge on a timing capacitor and thereby the phase angle at which a ramp superposed on the pedestal fires a programmable unijunction transistor to provide a pulse for triggering switching means to supply a fraction of the a.c. supply to the heater each half cycle. The residual charge on the summing capacitor is determined each half cycle by the discharging thereof in accordance with a load current pulse feedback circuit and the output of a comparing circuit which compares the actual temperature of the water flowing past the heater with a desired set temperature.

REFERENCES:
patent: 3719858 (1973-03-01), Gilbreath
patent: 3818320 (1974-06-01), Schindler
patent: 3858027 (1974-12-01), Phillips
patent: 3878358 (1975-04-01), Barton et al.
patent: 3943331 (1976-03-01), Meijer
patent: 3946200 (1976-03-01), Juodikis
patent: 4053733 (1977-10-01), Murata et al.
patent: 4086466 (1978-04-01), Scharlack

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