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SHUNTING TYPE PWM DIMMING CIRCUIT FOR INDIVIDUALLY CONTROLLING BRIGHTNESS OF SERIES CONNECTED LEDS OPERATED AT CONSTANT CURRENT AND METHOD THEREFOR
SHUNTING TYPE PWM DIMMING CIRCUIT FOR INDIVIDUALLY CONTROLLING BRIGHTNESS OF SERIES CONNECTED LEDS OPERATED AT CONSTANT CURRENT AND METHOD THEREFOR
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机译:用于恒定控制以恒定电流运行的串联LED亮度的遮光型PWM调光电路及其方法
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摘要
A Pulse Width Modulation (PWM) dimming circuit for individually controlling brightness of series connected Light Emitting Diodes (LEDS) operated at constant current has a first plurality of switching devices, a signal switching device of the first plurality coupled to an individual LED of series connected LEDS to control a brightness of the individual LED by periodically shunting the individual LED. A power converter supplies a constant output current to the series connected LEDs. Control circuitry is coupled to the power converter, wherein the control circuit corrects an internal DC state based on a feedback signal VO so that the output current of the power supply remains unchanged when at least one LEDs is shunted.
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