Power saving regulated light emitting diode circuit

Details Power saving regulated light emitting diode circuit Power saving regulated light emitting diode circuit

1980-11-12

1985-03-12

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

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

H05B 3702

Patent

active

045047766

ABSTRACT:
A power saving regulated light source circuit, comprising a light emitting diode (LED), a direct current source and a switching transistor connected in series with the LED, a control voltage producing resistor connected in series with the LED to produce a control voltage corresponding to the current through the LED, a storage capacitor connected in parallel with the series combination of the LED and the resistor, a comparator having its output connected to the input of the transistor, the comparator having a reference input and a control input, a stabilized biasing source for supplying a stabilized reference voltage to the reference input, the control input of the comparator being connected to the control voltage producing resistor, the comparator having a high output state when the reference voltage exceeds the control voltage while having a low output state when the control voltage exceeds the reference voltage, the transistor being conductive in response to the high state while being nonconductive in response to the low state, the transistor when conductive being effective to charge the capacitor and to increase the control voltage, whereby the comparator is cycled between the high and low output states while the transistor is cycled between conductive and nonconductive states.

REFERENCES:
patent: 3705316 (1972-12-01), Burrous et al.
patent: 3872301 (1975-03-01), Joppich
patent: 4001667 (1977-01-01), Bober
patent: 4156166 (1979-05-01), Shapiro et al.
patent: 4160934 (1979-07-01), Kirsch
patent: 4237405 (1980-12-01), Kellis
Thomas et al., "Digital Feedback Light-Emitting Diode Control", IBM TDB, Jan. 1974, vol. 16, No. 8, pp. 2598-2600, 250-205.

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