Power control for multiple heating elements

Details Power control for multiple heating elements Power control for multiple heating elements

1987-12-03

1990-02-20

Paschall, M. H.

Electric heating

Heating devices

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

219486, 219508, 219492, 219501, 323235, 307 38, H05B 102

Patent

active

049028774

ABSTRACT:
A power control arrangement for controlling the power output of a plurality of resistive heating elements (9a, 9b) comprises a multi-position switch (S1, S2) for connecting the heating elements in series and in parallel, a zero voltage switch (4), AND-gate (5), clock pulse generator (6), shift register (7) and semiconductor device (8) such as a trail which cooperate to vary the duty cycle applied to the heating elements in both serial and parallel modes.

REFERENCES:
patent: 3022409 (1962-02-01), Williams et al.
patent: 3196254 (1965-07-01), Knoop
patent: 3668367 (1972-06-01), Williams
patent: 4377739 (1983-03-01), Eckert, Jr. et al.
patent: 4400613 (1983-08-01), Popelish

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