Power control for multiple heating elements
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United States of America Patent
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-
Feb 20, 1990
Issued Date -
N/A
app pub date -
Dec 3, 1987
filing date -
Dec 21, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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