LED waterproof power is a kind of LED driving power. It is a voltage converter that converts the power supply into a specific voltage and current to drive the LED to emit light. Generally, the input of LED driving power includes high-voltage power frequency AC (that is, mains), Low-voltage DC, high-voltage DC, low-voltage high-frequency AC (such as the output of electronic transformers). The output of the LED driving power is mostly a constant current source that can change the voltage as the forward voltage drop of the LED changes.
LED waterproof power supplies can be divided into two categories according to the driving method:
(1) Constant current type: a. The output current of the constant current drive circuit is constant, but the output DC voltage changes within a certain range with the size of the load resistance. The smaller the load resistance, the lower the output voltage. The larger the load resistance value, the higher the output voltage; b. The constant current circuit is not afraid of short circuit of the load, but it is strictly forbidden to open the load completely. C. The constant current drive circuit is ideal for driving LEDs, but the price is relatively high. d. Attention should be paid to the maximum withstand current and voltage value, which limits the number of LEDs used; (2) voltage regulator: a. When the parameters of the voltage regulator circuit are determined, the output voltage is fixed, The output current changes with the increase and decrease of the load; b. The voltage stabilization circuit is not afraid of the open circuit of the load, but it is strictly forbidden that the load is completely short-circuited. C. The LEDs are driven by a voltage-stabilized drive circuit. Each string needs to be added with a suitable resistor to make each string of LEDs display the average brightness. D. The brightness will be affected by the rectified voltage change.