Linear high-efficiency constant current flicker-free led drive circuit and its drive method

Abstract

The present invention provides a linear high-efficiency constant current non-stroboscopic LED driving circuit and its driving method, comprising: a voltage input module, an LED load, a first energy storage capacitor, a charging module and a constant current control module; one end of the charging module is connected to the The output end of the voltage input module is connected, and the other end is connected to the first energy storage capacitor, which is suitable for charging the first energy storage capacitor when the input voltage is greater than the voltage of the first energy storage capacitor, and The average value of the charging current of the charging module in different input voltage cycles is constant; the first energy storage capacitor is connected to the LED load through the constant current control module, and is suitable for use in the constant current control module A constant current discharge is performed on the LED load under control to ensure that the LED load current has no ripple. The drive circuit of the present invention can realize the constant current of the output LED current in a wide input voltage range, and can also obtain high efficiency when the input voltage is high, and the output has no flicker.

Description

technical field [0001] The invention relates to the field of circuit design, in particular to a linear, high-efficiency, constant-current, flicker-free LED drive circuit and a drive method thereof. Background technique [0002] LED is a semiconductor electronic component that can emit light. This electronic component can only emit red light with low luminosity in the early days. With the continuous advancement of technology, it has now developed to the extent that it can emit visible light, infrared rays and ultraviolet rays. Big improvement. LED has the advantages of high efficiency, long life, unbreakable, high switching speed, high reliability, etc. that traditional light sources cannot match, and has been widely used in the fields of indicator lights, displays and lighting. [0003] Such as figure 1 Shown is a common structure of single-segment linear LED drive, the AC voltage AC is converted into the input voltage V after passing through the rectifier bridge IN , and...

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Problems solved by technology

[0007] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a linear high-efficiency constant current flicker-free LED drive circuit and its drive method, which are used to solve the overall efficiency, The input voltage range is narrow and the output is flickering

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