Power supply with thermistor precharge and protection circuit

Details Power supply with thermistor precharge and protection circuit Power supply with thermistor precharge and protection circuit

1997-07-02

2000-11-28

Paschall, Mark

Electric heating

Metal heating

By arc

21912157, 21912139, 21912145, 361106, B23K 1000

Patent

active

061538515

ABSTRACT:
A power supply with an input protection circuit is disclosed. The protection circuit includes a thermistor that heats up if the power supply is mistakenly connected to an excessive input voltage. When the thermistor gets hot, its resistance increases, and isolates the down stream portion of the power supply from the input voltage. A relay in parallel with the thermistor is closed, thus shorting the thermistor, after a preset time if the input voltage had a proper magnitude.

REFERENCES:
patent: 3916264 (1975-10-01), Berg
patent: 3935511 (1976-01-01), Boulanger et al.
patent: 5031066 (1991-07-01), Wagner et al.
patent: 5319533 (1994-06-01), Reynolds
patent: 5379176 (1995-01-01), Bacon et al.
patent: 5393954 (1995-02-01), Pasquini et al.
patent: 5543705 (1996-08-01), Uezono et al.
patent: 5627738 (1997-05-01), Lubomirski
patent: 5703746 (1997-12-01), Onizuka et al.

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