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

A PWM signal, LED lamp technology, applied in the use of semiconductor lamps, electrical components and other directions, can solve the problems of reducing cost, not giving convenience, etc., to achieve the effect of convenient use, convenient dimming, and high reliability

Active Publication Date: 2022-07-05
HANGZHOU YIHUITONG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0034] In view of the above situation, in order to overcome the above-mentioned defects of the prior art, especially the defect that the convenience of on-site construction and installation is not provided in the prior art, and at the same time the defects of positive and negative logic dimming are taken into account to reduce the cost, the present invention provides three The PWM signal dimming circuit and method of phase-to-AC power supply LED lamps effectively solve the above-mentioned problems

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0054] like figure 1 As shown in the figure, the basic way of realizing the dimming function in this embodiment is: after the external PWM signal is input through the isolation optocoupler circuit, after passing through the input impedance matching circuit, a dimming signal voltage is generated and provided to the driving chip circuit, and the driving chip circuit The output of the MOS transistor switch circuit is controlled according to the change of the dimming signal voltage and the change of the current signal collected by the LED load circuit, and the MOS transistor switch circuit controls the power change of the LED load circuit. Specifically: when the duty cycle of the PWM signal of the external dimming controller becomes larger, after the isolation optocoupler circuit and the input impedance matching circuit, the dimming signal voltage collected by the dimming control pin Is of the driver chip U2 becomes larger , the output voltage of the output power control pin OUT o...

Embodiment 2

[0056] like figure 2 As shown, in this embodiment, the pins of the driver chip U2 are defined as follows: pin 1 is the negative terminal of the power supply, grounded, pin 2 is the dimming control pin, which is connected to the resistor and capacitor, and pin 3 is floating, which is an empty tube Pin 4 is the current sampling pin, which is connected to the current sampling resistor and controlled by pin 2. The 5 pin of the driver chip U2 is the load output pin, and the 6 pin of the driver chip U2 is floating, which is an empty pin, the driver chip Pin 7 of U2 is the output control pin, and pin 8 of the driver chip U2 is the positive end of the power supply, which is connected to VCC.

[0057] The type of isolation optocoupler U1 is PC817, the driver chip U2 is M3103 of Hefei Yunshan Optoelectronics Technology Co., Ltd., the type of diode D1 is 1N4001, the type of MOS transistor Q1 is 1N80, the resistance value of resistor R1 is 1K ohm, the resistance value of resistor R2 is 1...

Embodiment 3

[0059]Similar to the above two embodiments, in this embodiment, a PWM signal dimming method and circuit for a three-phase 380V tunnel LED lamp driver chip interface, including an isolation optocoupler U1, a driver chip U2, a diode D1, a MOS Transistor Q1, resistor R1, resistor R2, resistor R3, resistor R4, resistor Rs, capacitor C1, capacitor C2, capacitor C3, etc. The pin 1 of the isolated optocoupler U1 is connected to the positive phase of the external PWM signal input PWM, the pin 2 of the isolated optocoupler U1 is connected to one end of the resistor R4, and the other end of the resistor R4 is connected to the negative phase of the external PWM signal input PWM , the pin 3 of the isolation optocoupler U1 is connected to the 8th pin of the driver chip U2 through the resistor R1, and is connected to the positive end of the diode D1 at the same time, and the pin 4 of the isolation optocoupler U1 is connected to the power ground. The negative end of the diode D1 is connected...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B45/325H05B45/40
CPCH05B45/325H05B45/40Y02B20/30
Inventor 徐超董强薛浩魏正毅屠中烈鲁华
Owner HANGZHOU YIHUITONG TECH CO LTD
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