Low-visual noise, jitterized pulse width modulation...

Electric lamp and discharge devices: systems – Current and/or voltage regulation

Reexamination Certificate

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Details

C315S194000, C315S224000, C315S307000

Reexamination Certificate

active

11139125

ABSTRACT:
A low visual noise, jitterized pulse width modulation brightness control circuit is provided. The circuit uses a brightness control signal generating unit to receive a brightness adjusting signal and to generate a brightness control signal in response to the brightness adjusting signal. The brightness control pulse signal has a duty cycle or frequency varying in a predetermined range. An inverter coupled to the brightness control signal generating unit drives the fluorescent lamp in response to the brightness control pulse signal to reduce the visual interference due to the adjustment of the current beam density.

REFERENCES:
patent: 6924606 (2005-08-01), Yu et al.

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