LED street lamp requirements for drive circuit
by:Litel Technology
2021-12-02
LED street lamp requirements for drive circuit
The requirement of LED street lights for the drive circuit is to ensure the characteristics of constant current output. Because the junction voltage is relatively small when the LED is working in the forward direction, the constant driving current of the LED street light is guaranteed and the output of the LED street light is basically guaranteed. Constant power. For the current situation of constant power supply voltage supply in our country, it is very necessary for the LED drive circuit of LED street lamps to have constant current output characteristics, which can ensure constant light output and prevent excessive operation of outdoor LED street lamps. In order to make the LED street lamp drive circuit exhibit constant current characteristics, looking inward from the output end of the drive circuit, its output internal impedance must be high. When working, the load current of the LED street lamp also passes through this output internal impedance. If the drive circuit is composed of a step-down, rectification and filtering plus a DC constant current source circuit or a general switching power supply plus a resistor circuit, it must also consume a lot of power. Large active power, so the correct design plan is to use active electronic switching circuits or high-frequency current to drive LED street lights, which can make the drive circuit have high conversion efficiency while maintaining good constant current output characteristics. .
The requirement of LED street lights for the drive circuit is to ensure the characteristics of constant current output. Because the junction voltage is relatively small when the LED is working in the forward direction, the constant driving current of the LED street light is guaranteed and the output of the LED street light is basically guaranteed. Constant power. For the current situation of constant power supply voltage supply in our country, it is very necessary for the LED drive circuit of LED street lamps to have constant current output characteristics, which can ensure constant light output and prevent excessive operation of outdoor LED street lamps. In order to make the LED street lamp drive circuit exhibit constant current characteristics, looking inward from the output end of the drive circuit, its output internal impedance must be high. When working, the load current of the LED street lamp also passes through this output internal impedance. If the drive circuit is composed of a step-down, rectification and filtering plus a DC constant current source circuit or a general switching power supply plus a resistor circuit, it must also consume a lot of power. Large active power, so the correct design plan is to use active electronic switching circuits or high-frequency current to drive LED street lights, which can make the drive circuit have high conversion efficiency while maintaining good constant current output characteristics. .
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