Detailed principle of various LED dimming power dimming methods

Release Time:

2022-10-09 09:23

At present, the commonly used LED dimming power supply includes LED thyristor dimming power supply, PWM dimming power supply and LED0/1-10V dimming power supply. Other dimming working principles are to realize LED dimming function by controlling the output of current, voltage and frequency.

Currently commonly usedLEDDimming power supply hasLEDSCR dimming power supply,PWMDimming power supply,LED0/1-10VDimming power supply,Other dimming principle is achieved by controlling the output of current, voltage and frequencyLEDDimming function. Please see below variousLEDDetailed principle of dimming mode of dimming power supply.

1,SCRLEDDimming power supply.SCR dimming earlier used in incandescent lamps and energy-saving lamps dimming way, but also the currentLEDApplicationVeryWide range of dimming ways. The working principle is that the input voltage waveform is cut by the conduction angle to produce a tangential output voltage waveform.,The application of the tangent principle can reduce the effective value of the output voltage, thereby reducing the ordinary load(resistive load)of power. The advantages of thyristor dimming are high efficiency and stable performance.

2,0/1-10VLEDDimming power supply,Adopt control chip design. When connecting0-10Vdimmer, by changing0-10Vvoltage to change the output current of the power supply, thereby reducing the light. Such0-10VDimmer modulation0Vthe current is reduced0, its light brightness will turn off(With switch function). When0-10VDimmerMoreLarge,The brightness will also be100%.(Constant output voltage)1-10VDimming principle: As explained above, only the dimmer is1-10V: When the resistance dimmer is setMoreSmall1VWhen changing the output current is also10%, such as10VWhen(ToMoreBig), the output current will also reach the output of the power supply100%The brightness will also100%(The output voltage is constant).Remarks:1-10VThere is no switch function, and the lamp cannot be adjustedMoreLow closing effect!

3,PWM LEDDimming power supply.Digital dimming also knownPWMDimming, throughPWMwave switchLED, Change the on-time of the forward current to achieve the effect of brightness level. The method is based on the characteristics of the human eye is not sensitive enough to the brightness flicker, so that the loadLEDLighten and darken. If the light/dark frequency exceeds100Hz, what the human eye sees will be the average brightness, notLEDFlashing.PWMThe brightness is adjusted by adjusting the ratio of the light time to the dark time. in aPWMcycle, the perceived brightness is a cumulative process, because the human eye is larger than100HzThe light flickers, that is, in the whole cycle, the greater the proportion of time is bright, the brighter the human eye feels. However, for some high-frequency sampling devices, such as high-frequency sampling cameras, they can captureLEDof the image. Therefore,ManufacturerCombining analog and digital, the design ofLEDDrive circuit.

LEDThe dimming power supply has the characteristics of high efficiency and high reliability, and is widely used in practical applications. Through the output signal line of the power supply, it can be realizedledDimming of the lamp. better and more perfectledThe dimming power supply can further meet the requirements of energy saving and emission reduction, so as to realize the future low-carbon life and effectively extendledThe service life of the lamp willledThe advantages of lighting are translated into actual economic benefits.