Temperature-compensated thermal protector

Details Temperature-compensated thermal protector Temperature-compensated thermal protector

1989-08-16

1992-10-06

Deboer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361106, H02H 902

Patent

active

051538059

ABSTRACT:
A protective PTC device is heated by a heater PTC device or by a resistor to an elevated temperature greater than ambient but less than its switching temperature. The elevated temperature of the protective PTC device reduces its switching response time, and minimizes variations in such response time with variations in ambient temperature. The protective PTC device is connected in series with an electrical load to reduce current to a load when the protective PTC device is switched to its high-resistance state by a temperature increase resulting from overcurrent. The heater PTC device or the heater resistor may be in parallel or in series with the protective PTC device. The heater PTC device does not carry load current, but the heater resistor may be placed in series with the load and the protective PTC device so as to carry load current along with the protective PTC device.

REFERENCES:
patent: Re31367 (1983-08-01), D'Entremont
patent: 3673538 (1972-06-01), Faxon
patent: 3916264 (1975-10-01), Berg
patent: 4422120 (1983-12-01), Kobayashi et al.
patent: 4792877 (1988-12-01), Thornton
patent: 4901186 (1990-02-01), Tennant et al.

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