Circuit for controlling a dryer-program switching device

Details Circuit for controlling a dryer-program switching device Circuit for controlling a dryer-program switching device

1978-11-14

1980-08-05

Schwartz, Larry I.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

219509, 340604, 340620, 34 53, F26B 1104

Patent

active

042154863

ABSTRACT:
Circuit for controlling the program timer of a laundry dryer as a function of the moisture-dependent resistance of the laundry. A storage capacitor charged from a d-c voltage source together with laundry resistance resulting from wet laundry bridging two electrodes and resistance determine the duty cycle or frequency for an oscillator. The output of the oscillator is fed to a filter and from there as one input to a comparator. A reference value setter is fed to another input of the comparator. The output of the comparator is functionally connected to the program timer. This circuit arrangement makes possible measurement of low residual moisture values in the laundry and thereby permits the start of the post-drying phase without heating on reaching this low residual moisture value.

REFERENCES:
patent: 3394467 (1968-07-01), Janke
patent: 3702030 (1972-11-01), Janke
patent: 3882381 (1975-05-01), Gregory
Photoamplifier, Electronic Engrg., Feb. 1972, p. 52.

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