LED array interface circuit with three-winding coupled inductor

Abstract

An LED array interface circuit containing three-winding coupled inductors is formed by n channel circuits and one multi-channel current controller having a dimming function. Each channel circuit j (j=1,...,n) is composed of an input capacitor Cij, an inductor Lj, an N-MOS main pipe Mj, the three-winding coupled inductor Laj, the three-winding coupled inductor Lbj, the three-winding coupled inductor Lcj, an auxiliary diode Daj, an auxiliary diode Dbj, an auxiliary diode Dcj, an N-MOS auxiliary pipe Maj, a TVS pipe TVSj and an output capacitor Coj. The multi-channel current controller matched with the channel circuits j and having the dimming function is provided with a port vc, a port vs, a port vgj, a port vsj, a port vgaj, a port vsenj and a port vpj. The LED array interface circuit solves the problem that various branch circuits in an LED array are not inconsistent through a regulation effect of the LED array interface circuit, meanwhile, efficient LED array drive is achieved through collection and feedback effects of excess energy of the LED array interface circuit, and the LED array interface circuit is suitable for drive systems of random regular or irregular LED arrays.

Description

technical field [0001] The invention relates to a direct current-direct current (DC-DC) interface circuit with single input and multiple outputs, which is applied to a regular or irregular LED array drive system, in particular to an LED array interface circuit with a three-winding coupling inductor. Background technique [0002] LED (Light Emitting Diode) is a solid semiconductor device that converts electrical energy into light energy. In high-power lighting applications, it is most common for multiple series-parallel LEDs to work in an array. Due to reasons such as array structure, device manufacturing and aging, there are inconsistencies between individuals even for LEDs of the same specification in a regular array. Therefore, an LED array driving system with superior performance must not only overcome the inconsistency problems existing in regular or irregular LED arrays, but also achieve higher LED array driving efficiency. At present, the commonly used low-cost LED a...

AI Technical Summary

Problems solved by technology

When there is a large difference in the conduction voltage drop of each branch in the LED array, especially when the LED array is irregular, the scheme of "linear adjustment constant current circuit with adjustable DC voltage source cascaded with multiple inputs in parallel" will not be able to achieve high efficiency

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