Fail safe protection circuit for PTC comfort devices

Details Fail safe protection circuit for PTC comfort devices Fail safe protection circuit for PTC comfort devices

1996-07-24

1998-03-10

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361103, 361118, 323284, 219497, H02H 300

Patent

active

057268509

ABSTRACT:
An electrical heating apparatus comprising a controller, fail safe protection circuit and resistance heating body embedded in a comfort device. The fail safe protection circuit is constructed to detect a break or short circuit in either of the conductors of a PTC type resistance heating body thereby shutting off the comfort device for preventing injury to the user and possible fires.

REFERENCES:
patent: 3628093 (1971-12-01), Crowley
patent: 3792289 (1974-02-01), Kazem
patent: 3794811 (1974-02-01), Hehl
patent: 4435677 (1984-03-01), Thomas
patent: 4554439 (1985-11-01), Cross et al.
patent: 4577094 (1986-03-01), Mills
patent: 4882782 (1989-11-01), Kimizuka et al.
patent: 5079409 (1992-01-01), Takada et al.

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