LED waterproof power can be divided into several categories according to circuit layout: 
1. Electronic transformer step-down: This power supply layout is inefficient in that the conversion power is low, the voltage scale is narrow, usually 180~240V, and the ripple interference is large.
2, capacitor step-down: This method of LED waterproof power supply is simply affected by the grid voltage shake, power supply is low, it is not suitable for LEDs to use when flashing. Since the circuit is stepped down by the capacitor, when the flashing is applied, due to the effect of charging and discharging, the current through the LED is extremely large, and the chip is simply damaged.
3, PWM control switching power supply: At present, the LED power supply depicted by the PWM control method is more ambitious, because the output voltage or current of this LED waterproof power supply is very stable.