Overcurrent protector for power element

Details Overcurrent protector for power element Overcurrent protector for power element

1992-05-15

1995-01-17

Hoff, Marc S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 18, 361 98, H03K 1708

Patent

active

053830822

ABSTRACT:
A circuit for providing an overcurrent protection for a power element, such as an IGBT, MOSFET or bipolar transistor, which is inserted between the power supply and a load, the protection circuit comprising a control circuit that provides an input to a gate amplifier at the power element gate. The gate amplifier comprises a photodiode that is connected between the amplifier power supply and the power element gate. The photodiode provides a clamp of the gate voltage in the event of an overcurrent and communicates optically with a phototransistor to provide a detection signal that can modify the control circuit operation. Specifically, the detection circuit can modify the input to the control circuit or control the output of the control circuit so that the energization of the power element is stopped or limited. The control can be through Darlington-connected transistors at the output of the phototransistor.

REFERENCES:
patent: 4949213 (1990-08-01), Sasagawa
patent: 5200878 (1993-04-01), Sasagawa
patent: 5210479 (1993-05-01), Kimura

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