Linear constant current controller
A linear constant current controller technology, applied in lighting devices, light sources, electric light sources, etc., can solve the problems of low efficiency and limited linear constant current controllers, and achieve low cost, high efficiency, good line regulation and load regulation rate effect
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[0039] The basic idea of the present invention is to remove the figure 1 In this way, the AC 110V or 220V voltage is only rectified, and VIN is no longer an approximate DC voltage, but a unidirectional pulsating signal of 100 / 120Hz, such as figure 2shown. At this time, the VIN voltage changes continuously from the lowest 0V to the highest 311V (rectified result of 220V alternating current). When the VIN voltage is lower than the forward conduction voltage VLED of the LED load 190, the LED has no current. When the VIN voltage rises higher than the forward voltage VLED of the load 190, the LED current starts to increase until it reaches the maximum current limit. If the VIN voltage continues to increase afterwards, the excess voltage (VIN-VLED) will be borne by the constant current controller, and the power borne by the controller will be P LOSE =(VIN-VLED)*ILED, if ILED remains unchanged, the bigger (VIN-VLED), P LOSE The larger; but as (VIN-VLED) becomes larger and ILED...
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