PWM signal dimming circuit and method for three-phase AC-powered LED lamps

Abstract

The invention discloses a PWM signal dimming circuit and method for three-phase AC power supply LED lamps, in particular a PWM signal dimming method and circuit for a three-phase 380V tunnel LED lamp driving chip, including a dimming input signal processing circuit, Isolation optocoupler circuit, driver chip output control circuit, etc. The circuit has simple structure, good dimming linearity, convenient use, high reliability, and is compatible with mainstream dimming input signals on the market. The dimming interface of the dedicated driver chip for 380V tunnel LED lights matches the dimming interface, is compatible with positive and negative logic dimming methods, and realizes digital intelligent dimming applications. It has the advantages of reliable use, convenient dimming, less peripheral circuits, and low cost.

Description

technical field

[0001] The invention belongs to the electronic field of tunnel lighting, in particular to a PWM signal dimming circuit and method for a three-phase AC power supply LED lamp, and more particularly, to a PWM signal dimming method for a three-phase 380V tunnel LED lamp driving chip and circuit. Background technique

[0002] As a new generation of green and efficient lighting sources, LEDs are more and more widely used. LED lighting technology has the characteristics of high light efficiency, good color rendering, long life, energy saving and environmental protection. It is constantly replacing traditional lighting technology. In order to create a more comfortable lighting atmosphere and To save energy, the use of three-phase 380V LED tunnel lighting modules has begun to be applied. Among them, the research on LED lighting dimming technology is extremely important. The existing three-phase 380V LED tunnel lighting usually uses 0-10V analog voltage. The signal di...

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