Strobe-removed linear LED driving circuit

Abstract

The invention provides a strobe-removed linear LED driving circuit comprising a rectifier bridge, an LED load, a first driving circuit, a second driving circuit and a capacitor; an input AC voltage is accessed to the input end of the rectifier bridge to conduct rectification; one end of the capacitor is connected with one output end of the rectifier bridge and the other end of the capacitor is connected with the first driving circuit; the intersection of the rectifier bridge and the capacitor is connected with the second driving circuit; and one end of the LED load is connected with the first driving circuit and the other end of the LED load is connected with the second driving circuit. The strobe-removed linear LED driving circuit has the advantages that the voltage across the capacitor is no longer clamped by the load pressure drop of lamp beads. In the same time, the higher the capacitor charging current, the higher the voltage across the capacitor, and the greater the energy released by the capacitor, so that in the case of the same capacitor capacitance no / low strobe effect can be achieved.

Description

technical field [0001] The invention relates to a flicker-removing linear LED drive circuit. Background technique [0002] In recent years, high-brightness LED lighting is gradually replacing traditional light sources such as incandescent lamps and fluorescent lamps with the advantages of high luminous efficiency, long life, high reliability and no pollution. With the increasing improvement of LED technology, the United States has specified the requirements for the strobe percentage in CEC-400-2015-038-CMF JA10. Although it is only implemented in California, it is conceivable that there will be a large increase in the near future. Area implementation. [0003] Especially for the traditional linear high PF solution, in the traditional linear dimming driver, because the input cannot be powered by electrolysis, it is necessary to store enough energy in the output electrolysis to achieve no / low flicker of the LED. However, because the operating frequency of the linear drive is...

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Problems solved by technology

[0006] Among them, the capacitor C1 will be charged only when the instantaneous value of the input voltage is less than the voltage of the lamp bead, and when the lamp bead is turned on, the voltage of the two stages of the capacitor is clamped at Vled by the lamp bead. It is not difficult to know that the capacitor stores The energy of the lamp is very limited, so when the structure of the whole lamp is limited and the capacitor capacity C is limited, the capacitor cannot provide enough energy, so it is difficult to achieve no / low strobe drive

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