Load driving circuit with protective circuit

Details Load driving circuit with protective circuit Load driving circuit with protective circuit

1994-09-15

1996-10-22

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 79, 361 87, 361103, 361 24, H02H 902

Patent

active

055683479

ABSTRACT:
A driving circuit for driving a given load based on a load control signal is provided which includes a power transistor, a protective circuit, and a power transistor control circuit. The power transistor is responsive to the load control signal inputted to the driving circuit to be turned on for activating the load. The protective circuit is arranged to be activated by the load control signal to monitor a malfunction of the power transistor caused by overheating or overcurrent flow to restrict an operation of the power transistor. The power transistor control circuit is arranged to prohibit the power transistor from being turned on until the load control signal reaches a preselected level required for operating the protective circuit stably. The power transistor control circuit may alternatively be designed to neglect an operation of the protective circuit until the load control signal reaches the preselected level required for operating the protective circuit stably to prohibit the protective circuit from restricting the operation of the power transistor.

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