What are the reasons for aluminum electrolytic capacitors used in LED lighting circuit? (II)

1. The electrolytic capacitor should resist the ripple current. The filter of the capacitor in the power supply is divided into two kinds of low frequency filtering and high frequency filtering. The low frequency filter capacitor is mainly used for the filter of the city electric power filter or the rectifier after the transformer, and its working frequency is low and the City electricity is 50Hz. High frequency filter capacitor is mainly used to filter the rectifier after switching power supply, and its operating frequency is thousands of Hz to tens of tens of thousands of Hz. If the capacity of the capacitor is poor, the capacitor will be heated by the high ripple current, the higher temperature will make the electrolyte in the capacitor gasified, the internal pressure in the electric container will rise, eventually lead to the pressure of the electric container. The capacitor burst failure.

2. The capacitor should be able to withstand lightning, and can withstand the impact of short time and large current, especially when used outdoors, such as lightning strike will make the power grid voltage fluctuate rapidly. The sudden change of the input voltage of the power supply will make the rectifying voltage increase to a value far beyond the capacitor voltage, causing the electric vessel to be penetrated.