Multiple power FET vehicle lamp switch arrangement with charge p

Details Multiple power FET vehicle lamp switch arrangement with charge p Multiple power FET vehicle lamp switch arrangement with charge p

1987-05-22

1988-02-23

Ro, Bentsu

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

315 82, 340 76, B60Q 104

Patent

active

047272619

ABSTRACT:
A power MOSFET switching control for multiple loads requiring current limiting at initial energization comprises at least two MOSFETs connected in series between one of the multiple loads and a power supply. Each MOSFET has a control electrode with a control electrode capacitance. Each control electrode is connected to a single charge pump, powered by the power supply, repeatedly in a pulsed manner to limit average current through its MOSFET. The individual control electrodes are connected to the charge pump alternately in a predetermined order such that no two control electrodes are connected to the charge pump simultaneously. In one mode of operation, the control electrodes and charge pump are connected and disconnected by clocked, multiplexing switch control means at predetermined times. In another mode of operation, only the connections are accomplished at the predetermined times; and the disconnections are in response to control electrode voltage sensing means. In this last mode of operation, each control electrode may include discharge means activatable by the clocked, multiplexing switch control at predetermined times after the disconnection from the charge pump.

REFERENCES:
patent: 4001664 (1977-01-01), Hyltin
patent: 4015137 (1977-03-01), Kniesly et al.
patent: 4047091 (1977-09-01), Hutchines et al.
patent: 4603269 (1986-07-01), Hochstein
patent: 4661717 (1987-04-01), Nishioka
S. D. Woithe, "Transistor Switching for High Power Headlights", Electronics, Australia, vol. 39, No. 5, pp. 56-59, Aug., 1977.

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