Light-emitting diode array current power supply including switch

Details Light-emitting diode array current power supply including switch Light-emitting diode array current power supply including switch

1992-09-21

1994-02-22

Stephan, Steven L.

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

323316, 323317, 3072966, 3072961, 346108, 354 4, 354 7, G05F 326

Patent

active

052891127

ABSTRACT:
A programmable power supply for driving LEDS is disclosed that includes a reference current leg and a number of output current legs. Both the reference current leg and the output current legs are further comprised of a plurality of parallel driver FET-control FET pairs, in which the driver and control FETs are connected in series. The driver FETs are biased by a reference voltage that provides a predetermined maximum output current. The control FETs are individually selected to provide a controlled output current. The individual control voltage is either a positive voltage, which disables the control FET, or a predetermined cascode voltage that places the control FET at or into the high output impedance saturation conduction region. By placing the control FETs into the saturation region, the output current is substantially insensitive to voltage fluctuations at the output

REFERENCES:
patent: 4780731 (1988-10-01), Creutzmann et al.
patent: 4864216 (1989-09-01), Kalata et al.
patent: 5009192 (1992-03-01), Thayer et al.
patent: 5166702 (1992-11-01), Mattern et al.

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