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Title:
OVERCURRENT PROTECTION CURCUIT INCLUDING AUTO-RESET BREAKER AND PTC RESISTOR
Document Type and Number:
WIPO Patent Application WO2006025930
Kind Code:
A3
Abstract:
An overcurrent protection circuit for low-voltage, high-current electrical systems comprises a Positive Temperature Coefficient (PTC) resistor (20) in series with an auto-reset thermal breaker (18). The breaker (18) allows for intermittent current within an assumed product usage duty cycle, and repeatedly trips and resets on sustained high current usage or during a short-circuit fault. The PTC resistor (20) limits current in the system to a low value when the temperature rises to the PTC resistor's trip point. The PTC resistor (20) protects the system from thermal damage during the non-breaker-tripped portions of sustained high current use, or during continuous low-current use. The use of both the PTC resistor (20) and auto-reset breaker (18) provides thermal overcurrent protection while allowing for performance claims based on an assumed duty cycle of product use.

Inventors:
FRANCIS RODERICK M (US)
Application Number:
US2005022647W
Publication Date:
May 04, 2006
Filing Date:
June 24, 2005
Export Citation:
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Assignee:
SHALLCO INC (US)
FRANCIS RODERICK M (US)
International Classes:
H01C1/14; H01C7/02; H01C7/12; H02H5/04; H02H9/02; H01H81/04; (IPC1-7): H02H3/00; H02H5/00; H02H5/04; H02H7/00; H02H9/04
Foreign References:
US4937696A1990-06-26
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