Clothes dryer moisture sensing circuit

Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters

Reexamination Certificate

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Details

C324S664000, C073S073000, C034S528000

Reexamination Certificate

active

07345491

ABSTRACT:
A moisture sensing circuit for a clothes dryer in which clothes tumble during drying has a pair of spaced apart electrode sensors for sensing the electrical resistance of the clothes when the clothes contact the electrodes. The circuit has an active filter for suppressing noise related to the operating line frequency of the clothes dryer to provide a filtered voltage signal representative of voltage drop across the electrode sensors with the line frequency noise suppressed.

REFERENCES:
patent: 3809924 (1974-05-01), Grunow et al.
patent: 4477982 (1984-10-01), Cotton
patent: 4525937 (1985-07-01), Strandberg et al.
patent: 5367265 (1994-11-01), Gaudette
patent: 5682788 (1997-11-01), Netzer
patent: 6242927 (2001-06-01), Adams et al.
patent: 2001/0054903 (2001-12-01), Adams et al.

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