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Single-segment linear constant-power LED driving circuit and method
A single-segment linear constant-power LED driving circuit and method. The circuit comprises: a voltage input module, an LED load, a power switch tube, a sampling resistor, an over-voltage control module for detecting the voltage at a drain terminal of the power switch tube, a current control module for limiting a peak current of the LED load, and a comparison module. When an input voltage is greater than a turn-on voltage of the LED load, the current control module limits the peak current so that the current average value in different input voltage periods is constant. When the input voltage is greater than a set value, current flowing through the LED load is turned off, thereby reducing power consumption. When the input voltage is less than the turn-on voltage of the LED load, the LED load is turned off.
CHINA RESOURCES POWTECH (SHANGHAI) CO., LTD.
H H Y H
H05B H05B Y02B H05B
inventional inventional additional inventional
Quanqing Guocheng Jun
Wu Li Liu