During the use of LED switching power supply, the power supply may catch fire due to short circuit or be damaged due to power overload. The so-called short-circuit protection is to cut off the power supply in a very short time after the short-circuit fault occurs, to protect the load from the impact of large current, and also to effectively protect the safety of led switching power supply.
Classification of LED driving power supply
constant current
1.The current output by the constant current driving circuit of LED lamp driving power supply is constant, but the output DC voltage varies within a certain range with the load resistance. Low load resistance leads to low output voltage, while high load resistance leads to high output voltage.
2. The constant current circuit of 2.LED lamp driving power supply is not afraid of load short circuit, but it is forbidden to completely open the load;
3. The constant current driving circuit of LED lamp driving power supply is ideal to drive LED, but the price is relatively high;
4. Pay attention to the maximum withstand current and voltage used by the constant current driving power supply of LED lamps, which limits the use of LEDs.
Constant pressure type
1. When the parameters in the constant voltage circuit are determined, the output voltage is fixed, but the output current changes with the increase or decrease of the load.
2. The voltage stabilizing circuit of the constant-voltage LED lamp driving power supply is not afraid of the open circuit of the load, but it is forbidden to completely short-circuit the load;
3. Constant-voltage LED lamp driving power supply uses a constant-voltage driving circuit to drive LEDs, and appropriate resistors need to be added to each string to make the display brightness of each string average;
4. The brightness of constant voltage LED lamp driving power supply will be affected by the change of rectified voltage.
References:
LED driving power supply-Baidu encyclopedia