A High Voltage Linear LED Control Circuit for Harmonic Reduction

Abstract

The disclosure relates to a high-voltage linear LED control circuit for reducing harmonics. The control circuit includes a voltage divider circuit, a drive control circuit and a sampling resistor. Wherein, the voltage divider circuit provides a reference voltage to the drive control circuit, and the waveform of the reference voltage is consistent with the waveform of the loaded voltage at the input end of the LED light string. When the loading voltage at both ends of the LED light string is greater than the conduction voltage of the LED light string, the drive control circuit connected to the LED light string is turned on, and the current waveform flowing through the LED light string is consistent with the current waveform of the sampling resistor; while the sampling resistor is loaded The voltage is the same as the reference voltage, so the waveform of the current flowing through the LED light string is consistent with the waveform of the input voltage, thereby reducing the influence of harmonics.

Description

technical field [0001] The present disclosure relates to the technical field of LED lighting control, in particular to a high-voltage linear LED control circuit with harmonic reduction. Background technique [0002] At present, there are many forms of high-voltage linear LED light string control circuits and methods on the market. The non-electrolytic capacitor high-voltage linear constant current drive method and drive chip are one of them. This drive technology has high power factor, small size, low cost, and reliability. High; mainly because when the voltage at both ends of the LED light string exceeds the LED conduction voltage, the LED light string is turned on, and the current flowing through the LED light string is a constant value, but in the case of electrolytic capacitor energy storage, it is added to the The voltage at both ends of the LED light string has a waveform change, and the ladder waveform of the current and the half-sine waveform of the voltage are serio...

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Problems solved by technology

[0002] At present, there are many forms of high-voltage linear LED light string control circuits and methods on the market. The non-electrolytic capacitor high-voltage linear constant current drive method and drive chip are one of them. This drive technology has high power factor, small size, low cost, and reliability. High; mainly because when the voltage at both ends of the LED light string exceeds the LED conduction voltage, the LED light string is turned on, and the current flowing through the LED light string is a constant value, but in the case of electrolytic capacitor energy storage, it is added to the The voltage at both ends of the LED light string has a waveform change, and the ladder waveform of the current and the half-sine waveform of the voltage are seriously distorted, which will form a large harmonic, which cannot meet the general lighting standards.

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