| 摘要 |
A Switching Mode Power Supply (SMPS), which can operate at a high switching frequency by preventing any oscillation within a circuit, is provided. The SMPS includes: a power output unit for outputting a 1<st> power and 2<nd> power; a switching unit for switching the 2<nd> power on/off according to a switching signal to output a square wave signal having the 2<nd> power level and a frequency of the switching signal; an inverter for receiving the square wave signal having the 2<nd> power level and amplifying it to a square wave signal having the 1<st> power level; and an output rectifying unit for rectifying the square wave signal output from the inverter and outputting DC power. Since the SMPS provides V1 and V2, to a main power amplifier (output side of the power transformer) and a switching frequency oscillator (PWM control circuit), respectively, no oscillation happens even when a switching frequency increases and thus high efficiency can be obtained. |
