Charge coupled LED driver circuit

Details Charge coupled LED driver circuit Charge coupled LED driver circuit

1986-04-04

1987-06-16

Wong, Peter S.

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

323267, G05F 146

Patent

active

046738657

ABSTRACT:
An LED and battery powered driver circuit provide efficient operation to conserve battery energy and maintain the intensity of light emitted from the LED at a substantially constant level despite changes in the battery voltage due to charging and discharging. A pulsed voltage output of a switching power supply is capacitively coupled to the LED. The voltage amplitude of the output pulses is maintained substantially constant by a duty cycle modulator which is connected in a feedback path of the switching power supply. A diode or a transistor circuit is provided to discharge the capacitor between voltage pulses.

REFERENCES:
patent: 4413224 (1983-11-01), Krupka et al.
Capacitor Drops Voltage with Little Heat for a Low-Cost Low Voltage Power Supply, Electronic Design 24, Nov. 22, 1975.

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