Patent ID: 7939964

Claim:
A power supply equipped with a modularized power supply switch control structure, the power supply being connected with an AC power input source to obtain an input power, the power supply comprising: a standby power system supplying power to start a pulse width modulation which generates a duty cycle signal; a power factor correction circuit receiving the duty cycle signal, regulating a phase of the input power, and producing an output; a main power system receiving the output of the power factor correction and including a high voltage output unit and a low voltage output unit, the high voltage output unit delivering high voltage DC power through a high voltage output end, and the low voltage output unit delivering low voltage DC power through a low voltage output end; and a control unit connecting to the high voltage output unit and the low voltage output unit and receiving the duty cycle signal of the pulse width modulation to order the start time of the high voltage output unit and the low voltage output unit to start asynchronously, with one of the output units having a deferred start time and the other output unit having a non-deferred start time while staying on together, until a power requirement is reached, so as to avoid surge voltages at a start instant of the power source.