Protection circuit protected from overvoltage and overcurrent

Details Protection circuit protected from overvoltage and overcurrent Protection circuit protected from overvoltage and overcurrent

H - Electricity

02

H

323/6, 317/12.4

H02H 9/04 (2006.01) H02H 9/02 (2006.01)

Patent

CA 2023605

A protection circuit for a semiconductor circuit or telephone line has an electrical source connected to the semiconductor circuit or the line, for supplying current to the semiconductor circuit, and a surge-absorbing device arranged in parallel with the semiconductor circuit or the line, for absorbing a power surge, such as caused by lightning, moving from the electrical source to the semiconductor or the line. A positive thermistor having a high positive-resistance-temperature coefficient is arranged in series with the semiconductor circuit or the line, at a position between the electric source and the surge-absorbing device. A resistor is connected in series with the semiconductor circuit or the line at a position between the thermistor and the electric source.

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