Power switch with overload protection

Details Power switch with overload protection Power switch with overload protection

1998-09-29

2000-10-24

Ballato, Josie

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 94, 361 98, H02H 504

Patent

active

06137668&

ABSTRACT:
An overload protection circuit for a power switch has a delay element by means of which the voltage which is dropped across the power switch, the supply voltage and a temperature margin are evaluated in comparison with a maximum permissible depletion layer temperature. In the practical embodiment, a capacitor is provided which is charged and discharged by suitably controlled current sources. A disconnect signal for switching the power switch is produced by comparing the capacitor voltage with the temperature margin. The circuit ensures a safe disconnection in the event of a short condition in the load, even in the case of a periodic switching operation of the power switch.

REFERENCES:
patent: 4355344 (1982-10-01), Felici et al.
patent: 4787007 (1988-11-01), Matsumura et al.
patent: 5383083 (1995-01-01), Shinoda et al.
patent: 5467242 (1995-11-01), Kiraly
patent: 5506539 (1996-04-01), Kelly et al.
patent: 5555152 (1996-09-01), Brauchle et al.
patent: 5723915 (1998-03-01), Maher et al.
patent: 5737169 (1998-04-01), Sellers

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