source:Industry Trends release time:2023-10-27 Hits: Popular:led screen wholesaler
1. Pulse Width Modulation (PWM) digitizes the power supply square wave and controls the duty cycle of the square wave to achieve current control.
2. The constant current power supply can be easily adjusted by using analog linear technology for regulation.
3. Group control: Group multiple LEDs and use a simple grouping device to control them.
The two methods mentioned in 1.2 above can be achieved by using an adjustable resistor knob for stepless control. Due to the maturity of PWM module technology, the cost has been reduced. It is difficult to determine which method of flow control is used from the perspective of price. However, adjustable resistors themselves are not a very reliable component. Often, due to the entry of dust or the lax manufacturing process, there may be a momentary malfunction when operating adjustable resistors, causing the light source to flash. This flicker is less noticeable when using PWM mode, and more pronounced when using linear technology to regulate current.
No matter how the current is regulated, it can be changed to a touch button switch or an independent group switch (such as a group controller or remote control) to control the lighting. This type of quality is relatively reliable and has a much longer service life. It is really necessary to use adjustable resistors for delicate lighting control. It is recommended to use high-quality adjustable resistors (usually costing a few to 10 yuan).
Whether LED is driven by buck, boost, buck/boost, or linear voltage regulator, the most common thread connecting each driver circuit is to control the output of light. Currently, there are only a few applications that only require simple functions to turn on and off, and the vast majority require fine-tuning the brightness from 0 to 100%. In terms of photometric control, the main two solutions are to linearly adjust the current of the LED (analog dimming) or to switch the driving current back and forth from 0 to the target current value at high frequencies that cannot be detected by the naked eye (digital dimming). Using Pulse Width Modulation (PWM) to set the cycle and duty cycle may be the simplest method to achieve digital dimming, as the same technology can be used to control most switching converters.
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