High-voltage lamp strip harmonic control circuit

Abstract

The invention discloses a high-voltage lamp strip harmonic control circuit. The high-voltage lamp strip harmonic control circuit comprises a live wire input end, a zero wire input end, a full-bridge rectification module, a constant-current control module, a first LED lamp strip module, a second LED lamp strip module and a current isolation control module, wherein the live wire input end is connected with a first input end of the full-bridge rectification module, the zero line input end is connected with a second input end of the full-bridge rectification module, a first output end of the full-bridge rectification module is connected with an input end of the constant-current control module, the first LED lamp strip module comprises a first current control module and a first LED lamp strip series circuit, and the second LED lamp strip module comprises a second LED lamp strip series circuit and a second current control module. The high-voltage lamp strip harmonic control circuit is advantaged in that harmonic distortion of the first LED lamp strip series circuit and the second LED lamp strip series circuit is controlled, defects of application of an existing LED lamp strip are overcome, an external large-size power source can be omitted, installation difficulty is lowered, and the high-voltage lamp strip harmonic control circuit well conforms to space modeling.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a harmonic control circuit for high-voltage lamp strips. Background technique [0002] At present, the existing high-voltage LED strips are directly connected to the mains ( figure 1 Mains waveform) and convenient to work, the LED light strip works in the pulsating DC voltage ( figure 2 pulsating voltage) state. In this way, since our national standard voltage is 220VAC50HZ, the LEDs must be connected in series close to this voltage to be convenient to use. The more LEDs connected in series, the higher the starting voltage and the corresponding luminous efficiency. , the starting voltage is lower, but the corresponding luminous efficiency is lower, and the heat consumed by the corresponding resistance is also greater, so the approximate AC average value is generally used as a reference point for application. If 220V is used as the standard for LED series connection...

AI Technical Summary

Problems solved by technology

[0003] When we input the mains voltage between 0-220V, the LED can’t start up, and there’s no light output, so almost no current flows through the LED. When the voltage rises from 220V to 314V, the LED gradually flows with current and emits light. output;( image 3 , the existing high-voltage lamp strip working current) We can see from the figure that the current waveform of the LED and the stripping followability of the input voltage are incomplete, resulting in harmonic current distortion; we know that when the input voltage and current are completely in phase and follow the same , harmonics are the best

[0004] However, image 3 In the state shown, the current waveform of the LED and the stripping of the input voltage follow incompletely. In this section of the input voltage 0-220V and in this section of 220-0V, there is no current, so that the current harmonics If it is too big, it cannot meet the certification standards, and it will affect the stability of our national power grid during use, causing great harmonic interference

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