Uniform intensity led driver circuit

Details Uniform intensity led driver circuit Uniform intensity led driver circuit

1986-06-11

1988-01-05

Beha, Jr., William H.

Electricity: power supply or regulation systems

Output level responsive

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

250205, 307311, G05F 156

Patent

active

047178680

ABSTRACT:
A unique driver circuit for providing constant average current through a driven element or elements having varying impedance first samples the impedance at the drive terminal in order to determine impedance of the driven elements. For increasing impedance of the driven elements, the duty cycle of the driving signal is increased, thereby resulting in a near-constant average current through the driven elements when the number of driven elements in series is changed.

REFERENCES:
patent: 3705316 (1972-12-01), Burrous et al.
patent: 4101808 (1978-07-01), Flint
patent: 4156166 (1979-05-01), Shapiro et al.
patent: 4160934 (1979-07-01), Kirsch
patent: 4504777 (1985-03-01), Bauer

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