Overheat protection circuit

Details Overheat protection circuit Overheat protection circuit

2005-11-08

2005-11-08

Leja, Ronald (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

Reexamination Certificate

active

06963477

ABSTRACT:
A semiconductor switching element performs operations of bringing a current path from a power supply to a load into conduction and interrupting the path and is controlled by an operating-mode control circuit so as to operate in a first operating mode in which a conductive operation is shifted to an interrupt operation by using a change in resistance of a first positive-temperature-coefficient thermistor when the temperature of a temperature detection portion increases and reaches a predetermined interrupt temperature, and to be in a second operating mode in which the interrupt operation is shifted to the conductive operation by using a change in resistance of a second positive-temperature-coefficient thermistor when the temperature of the temperature detection portion decreases and reaches a return temperature, which is lower than the interrupt temperature by a predetermined value. Each operating mode is controlled in the state where both positive-temperature-coefficient thermistors are thermally coupled to the temperature detection portion.

REFERENCES:
patent: 3728702 (1973-04-01), Miyamoto et al.
patent: 6181541 (2001-01-01), Souri et al.
patent: 2002/0021539 (2002-02-01), Odaohhara et al.

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