Sinrace Power Supply Technology (Shenzhen) Co., Ltd.

Importance :

Select the working voltage of aluminum electrolytic capacitors carefully to get the best combination of minimum size and good operating life. These capacitors have longer operational life when operated at no more than 80% of their rated voltage. If the capacitors are used at full rated voltage, leakage current produces heating losses that can degrade the components. The rule of thumb is that every 10 degree C increase in temperature halves the life of the capacitor.  In practice, the dielectric layer in the capacitors will reform to the voltage at which they are being used, and any voltage surge can result in circuit failure, so the design should take this into account too. Use components with 105 degree C temperature specification for longest operating life. In practice a relatively large capacitor will be needed anyway, not just for ripple reduction but to provide the required DC hold-up time in the event of short-term disruption in the AC input.