Electricity: electrical systems and devices – Safety and protection of systems and devices – Impedance insertion
Reexamination Certificate
2006-12-05
2006-12-05
Leja, Ronald (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Impedance insertion
C361S106000
Reexamination Certificate
active
07145759
ABSTRACT:
An overcurrent protection circuit for low-voltage, high-current electrical systems comprises a Positive Temperature Coefficient (PTC) resistor in series with an auto-reset thermal breaker. The breaker 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 limits current in the system to a low value when the temperature rises to the PTC resistor's trip point. The PTC resistor 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 and auto-reset breaker provides thermal overcurrent protection while allowing for performance claims based on an assumed duty cycle of product use.
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patent: 5864458 (1999-01-01), Duffy et al.
patent: 6278596 (2001-08-01), Simpson
patent: 6437544 (2002-08-01), Yang
Coats & Bennett P.L.L.C.
Leja Ronald
Shallco, Inc.
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