Gene A Potter

US Patent:

42309700, Oct 28, 1980

Filed:

Mar 7, 1978

Appl. No.:

5/884147

Inventors:

Gene B. Potter - Santa Ana CA
Martin H. Jurick - Santa Ana CA

Assignee:

Lear Siegler, Inc. - Santa Monica CA

International Classification:

G05F 100
H05B 3702
H05B 3904
H05B 4136

US Classification:

315307

Abstract:

A method and apparatus for regulating the output flux generated by a lamp with the degeneration of the voltage from a power source such as a battery. The regulating circuit maintains a constant luminous flux output from a lamp over a substantial range of voltages by switching the voltage to the lamp on and off at a preselected and controlled duty cycle. The power pulses applied to the lamp have heights that vary directly as the voltage variations of the power source and widths that vary as the inverse square of the voltage from the power source for maintaining a constant RMS voltage on the lamp and thereby constant light output flux.