Meanwell

Switching power supplies mainly improve the weaknesses such as the huge volume, the heavy weight, and the low efficiency in linear power supplies. The topology of a switching power supply, rectifies and filters the voltage directly from AC mains (off-line) without using a low-frequency transformer. The capacitance of the bulk capacitor can be quite small due to the high rectified voltage. Switching power supply uses a high-frequency transistor to chop the high DC voltage (rectified from AC source) into high AC voltage and converts it into a desired voltage by a high-frequency transformer, and then rectifies and filters the voltage to a DC level. The high-frequency switching of the transistor and diodes results in generation of ripple noises at the transient of switching.