Tips: Advantages and disadvantages of switching power supply1. AdvantagesSwitching power supply is characterized by low energy consumption and high efficiency. In circuits of switching power supply, transistors excited by drive signals operates in alternating status from “on” to “off” or from “off” to “on”. Fast conversion speed and low energy consumption of switching transistors have greatly improved efficiency of power supply.Switching power supply is characterized by small size and weight. The switching power supply is equipped with no transformer and cooling fins, so it presents smaller size and weight.Switching power supply excels in its regulation range. Input voltage of the switching power supply is adjusted by occupation ratio of drive signals. Changes of input signal voltage can be compensated by frequency modulation or width adjustment. When industrial frequency power grid experiences great changes, the switching power supply can still maintain stable output of voltage.2. DisadvantagesSwitching power supply keeps bothered with serious switching noises. In switching power supply, power switches and transistors remain in working status. AC voltage and AC current generated by them exerts pulse noises and resonance noises on other components. If users fail to inhibit, eliminate or shield these noises, the operation of the equipment will be seriously influenced. In addition, switching power supply provides no isolation for transformer of industrial frequency. Therefore, the noise may be passed to power grid of industrial frequency, sending serious noise to connected electronic devices, equipment and household appliances. Switching power supply performs poorly in coping with electromagnetic noise, but modern shield technologies can compensate its disadvantage in this aspect.