Switching power supply attaining sinusoidal input current

摘要

The switching power supply attains sinusoidal input current even at a low level of the input voltage. One capacitor is grounded and stores an intermediate voltage. One switch selectively applies the intermediate voltage to a node. A grounded diode is coupled to the node. An inductor is coupled to the node for attaining a current. Another switch selectively applies the current to the input terminal. A rectifier applies the current to the output terminal. Another capacitor is coupled between the output terminal and the one capacitor for storing and providing the output voltage.