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LED LIGHTING DEVICE WITH CHOPPER CIRCUIT AND DIMMING CONTROL METHOD
LED LIGHTING DEVICE WITH CHOPPER CIRCUIT AND DIMMING CONTROL METHOD
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机译:具有斩波电路的led照明装置及调光控制方法
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摘要
A lighting device is provided for lighting control of an LED module based on an externally provided dimming control signal. A chopper circuit includes a switch coupled across a DC input and an inductor which receives and stores energy when the switch is turned on, and discharges energy to the LED module when the switch is turned off. A control circuit determines a current value to the switch, and compares the current value to a predetermined value. During normal operation, the switch is turned off when the detected current value reaches the predetermined value and turned back on when inductor discharge has completed. During a dimming operation, the normal operation is intermittently disabled in accordance with the dimming control signal. The dimming control signal may be a low-frequency PWM signal, with the lighting output being dimmed as a result of a duty ratio of the PWM signal.
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