| 摘要 |
The switching power supply has a high output power and high efficiency. This is accomplished by successively applying voltages of opposite polarities across primary of a power transformer, wherein only two transistors are used. The input voltage may be AC or DC. The switching power supply comprises a capacitor coupled to ground for storing a DC voltage having an opposite polarity to the input voltage. A pair of switches successively applies the input voltage and DC voltage to a node. A transformer has a first winding coupled to the node and ground, a second winding coupled to ground for providing a charging signal and a third winding for providing the output signal. A diode applies the charging signal to the capacitor.
|
