Circuit for prevention of undesired operation in multiple power

Details Circuit for prevention of undesired operation in multiple power Circuit for prevention of undesired operation in multiple power

1988-04-15

1989-07-25

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361187, 307130, 340663, H02H 324

Patent

active

048519529

ABSTRACT:
A switching module having a plurality of switching channels responsive to a microcontroller for coupling electrical power to a load, and decoupling electrical power in the event an undesired operating condition is sensed. Each switching channel includes a switching transistor and transistor driver. Monitoring circuitry senses the actual voltage drop across the load to provide the controller with an indication of undesired operation. A limiting resistor limits the transistor drive such that the transistor is forced out of satuaration during a high power condition, thereby avoiding undesired power dissipation which would otherwise occur if operation in the saturated condition continued.

REFERENCES:
patent: 3578983 (1971-05-01), Kondo
patent: 3591832 (1971-06-01), Pelka
patent: 3599042 (1971-08-01), Andrews
patent: 4158866 (1979-06-01), Baker
patent: 4618780 (1986-10-01), Ikoma et al.

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