Patent ID: 6995996

Claim:
A power supply having a rectifying circuit rectifying AC power; an inverting part inverting the power rectified by the rectifying circuit to the inverted AC power and supplying the inverted AC power to a load, and including a first bridge and a second bridge connected to opposite ends of the rectifying circuit and having respective pairs of switching units serially connected to each other, the power supply comprising: a control voltage signal generating part outputting a control voltage signal having alternating values corresponding to positive and negative values to control the AC power supplied from the inverting part to the load; and a switching controller determining a sign of the control voltage signal, when the control voltage signal is determined to correspond to the positive values, and controlling one of the switching units of the first bridge to turn off and a remaining one of the switching units of the first bridge to turn on, and the switching units of the second bridge to alternately turn on and turn off corresponding to which one of an absolute value of the control voltage signal and of an absolute value of a predetermined comparison voltage signal is greater.