PWM signal is a commonly used isolation technology, which realizes isolation and gives consideration to analog information transmission. Traditionally, the common methods used to realize the detection of analog signals and the isolated output of PWM signals are often realized by circuits composed of operational amplifiers, MCU and discrete devices, which often require more than 30 components. The system is very complicated, and its accuracy and reliability are usually poor.
Stepless dimming of LED lighting;
Analog DC dimming generally controls the output DC current by changing the reference of the steady current control loop of LED driver through analog level signals, thus effectively controlling the brightness of LED lamps. This dimming control method is simple to realize, and it does not need to change the main circuit structure of the original constant current driver. The driver has low cost and high efficiency.
The LED is driven by a constant current source, so the current is reduced, the on-voltage of the LED is also reduced, and the luminous efficiency is high. This brightness control method has been applied to stepless dimming control of LED lighting in some roads and tunnels.
Because the 0- 10V dimmer power supply is connected with 220V alternating current, the 0- 10V dimmer will be manually contacted, so electrical isolation is needed. Therefore, it is necessary to place a 0- 10V split-phase isolation module inside the 0- 10V dimming power supply.