Patent ID: 8295066

Claim:
An extensible switching power circuit, comprising: a rectifier filter circuit; a plurality of switching power modules connected in parallel to the rectifier circuit, each switching power module including a transformer and a pulse width modulation (PWM) controller connected to the transformer; and a plurality of synchronous signal generators, with every two adjacent switching power modules connected through one of the plurality of synchronous signal generators; wherein the rectifier filter circuit converts an alternating current (AC) to a direct current (DC) and inputs the DC to the transformers, and the PWM controllers control the DC provided by the rectifier filter circuit to generate induction electric potentials in the transformers; each synchronous pulse generator measures relevant electric potentials of the previous switching power module connected thereto and generates corresponding synchronous signals sent to the PWM controller of the subsequent switching power module connected thereto; and the PWM controller of the subsequent switching power module regulates the phase of the induction electric potential of the subsequent switching power module according to the synchronous signals, such that the induction electric potentials of the two adjacent switching power modules compensate each other's energy gaps generated by back electromotive forces generated in the transformers of the two adjacent switching power modules by the DC input to the transformers.