The driving method of LED lighting power supply
Time of issue:
2024-03-28
LEDs cannot directly use conventional mains voltage. Due to the characteristics of LED light sources, in order to meet the special voltage and current requirements of LED, it is necessary to use specially designed voltage conversion equipment to ensure the normal operation of LED. So LED lighting fixtures have a different power drive method from traditional lighting fixtures. The driving methods of LED lighting power supply include two types: Firstly, a constant current driving power supply. 1. The output current of a constant current drive circuit is constant, while the output DC voltage varies within a certain range with the size of the load resistance. When the load resistance is small, the output voltage is low, and the larger the load resistance, the higher the output voltage; 2. A constant current circuit is not afraid of load short circuits, but it is strictly prohibited to completely open the load; 3. The constant current drive circuit is ideal for driving LEDs, but relatively expensive; 4. Attention should be paid to the maximum withstand current and voltage values used, which limit the number of LEDs used. Secondly, a regulated driving power supply. 1. After the various parameters in the voltage stabilizing circuit are determined, the output voltage is fixed, while the output current changes with the increase or decrease of the load; 2. The voltage stabilizing circuit is not afraid of open circuit of the load, but it is strictly prohibited to have a complete short circuit of the load; 3. Drive the LED with a voltage stabilizing driving circuit, and add appropriate resistors to each string in order to make the brightness of each LED display average;
LEDs cannot directly use conventional mains voltage. Due to the characteristics of LED light sources, in order to meet the special voltage and current requirements of LED, it is necessary to use specially designed voltage conversion equipment to ensure the normal operation of LED. So LED lighting fixtures have a different power drive method from traditional lighting fixtures.
The driving methods of LED lighting power supply include two types:
Firstly, a constant current driving power supply.
1. The output current of a constant current drive circuit is constant, while the output DC voltage varies within a certain range with the size of the load resistance. When the load resistance is small, the output voltage is low, and the larger the load resistance, the higher the output voltage;
2. A constant current circuit is not afraid of load short circuits, but it is strictly prohibited to completely open the load;
3. The constant current drive circuit is ideal for driving LEDs, but relatively expensive;
4. Attention should be paid to the maximum withstand current and voltage values used, which limit the number of LEDs used.
Secondly, a regulated driving power supply.
1. After the various parameters in the voltage stabilizing circuit are determined, the output voltage is fixed, while the output current changes with the increase or decrease of the load;
2. The voltage stabilizing circuit is not afraid of open circuit of the load, but it is strictly prohibited to have a complete short circuit of the load;
3. Drive the LED with a voltage stabilizing driving circuit, and add appropriate resistors to each string in order to make the brightness of each LED display average;
Keyword:
Key words: led power supply,power adapter