Common analysis of the three kinds of LED dimming power supply

by:MOSO     2020-03-06
Now the most commonly used LED dimming power supply are: LED SCR adjustable power supply, LED light - 0/1 10 v adjustable light power supply, PWM dimming power supply. Dimming works by other control current and voltage, frequency, the size of the output to the LED dimming function, now shenzhen yuan hao intelligence to discuss with you about the above detailed principle of all kinds of dimmer way: 1, LED SCR dimmer power thyristor dimmer earlier before it is applied to incandescent lamp and energy-saving lamp dimming, and is applied to the LED dimming the broader range of a dimmer. Its working principle is the input voltage waveform by conduction Angle cutting wave, produce a tangential output voltage waveform. Application of the principle of tangential, can reduce the effective value of output voltage, in order to reduce the normal load ( Resistance load) The power. Silicon controlled dimmer the advantage of high work efficiency, stable performance. 2、0/1——领导 10 v adjustable light power supply design with a control chip, 0 10 v dimmer, through 0 10 v voltage change, change the power supply output current, light reduction. For example: when 0 10 v dimmer modulation to 0 v, the current drop to zero, the light brightness is closed ( There is a switch) When 0 10 v dimmer augmenting the largest 10 v, the output current will be 100% of the output power, brightness will be 100%. ( The output voltage is the same) 。 1 - 10 v dimmer principle: as mentioned, just dimmers is 1 10 v: when resistance dimmers adjust to minimum 1 v, the change of the output current is 10%, such as to 10 v ( Transferred to the largest) , the output current will be 100% of the output power, brightness will be 100%. ( The output voltage is the same) 。 Note: 1 10 v is no switch function, lamps and lanterns can not be transferred to the lowest close! 3, PWM dimming power supply digital dimming is also called the PWM dimming, opening and closing through PWM wave LED to change forward current conduction time, in order to achieve the effect of brightness control. The method is based on the characteristics of the human eye is sensitive to brightness twinkle enough, when the load when the LED light is dark. If the brightness, more than 100 hz frequency, is the average brightness of the human eye to see, not the LED flashing. PWM by adjusting the light and dark can adjust brightness, percentage of time in a PWM cycle, because the human eye is more than 100 hz in the flashing light, the brightness of the perception is a cumulative process, namely the bright time in the whole cycle of the higher the ratio, the brighter the human feeling. But for some high frequency sampling equipment, such as high frequency sampling camera, sampling that may happen to adopt to the LED dark images. To sum up, the current market that move light is more than three of the most common way that move light, of course, there are relatively small domestic market of the DALI dimming, want to know the specific knowledge of that move light, can consult more professional DALI dimming system company, — — — Shenzhen moso co. , LTD
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