Control circuit for power device and level shifting circuit and

Details Control circuit for power device and level shifting circuit and Control circuit for power device and level shifting circuit and

1993-12-09

1996-04-23

Deboer, Todd

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 94, 361 98, H02H 308

Patent

active

055109438

ABSTRACT:
In a control circuit for controlling a power transistor included in a power device, the transistor is turned-off when a drop of a control voltage level or overcurrent in the power transistor is detected. Signals for discriminating the overcurrent from the voltage drop are generated and individually outputted from the control circuit, whereby the reason why the transistors were turned-off can be monitored. After a predetermined time period has passed from the overcurrent had been detected, the transistor is automatically turned-on to recover the operation of the transistor. A capacitor for supplying the control power voltage is re-charged during the time period. It is not necessary to carefully determine the on/off timings of the input signal for waiting the recovery of the control power voltage.

REFERENCES:
patent: 4709320 (1987-11-01), Kongoka
patent: 4713553 (1987-12-01), Townsend et al.

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