Patent ID: 8080981

Claim:
An interleaved-PWM power module system having at least two power modules, and one of the power modules is a master power module and the remaining power module are slave power modules, each of the power modules comprising: a communication interface receiving and sending a sync signal to communicate the master power module and the slave power modules; an AC-to-DC converter converting an AC voltage into a predetermined DC voltage; and a digital signal processor connected to the communication interface and the AC-to-DC converter, and the digital signal processor comprising: a phase-locked loop unit receiving the sync signal and performing a phase-locking operation with reference to a corresponding phase offset of a specific ID number to generate a frequency switching signal, wherein Fp=sync_ref+1*Fo for the first slave power module with the ID=1, Fp=sync_ref+2*Fo for the second slave power module with the ID=2, Fp=sync_ref+3*Fo for the third slave power module with the ID=3, where Fp is an input signal, sync_ref is the sync signal, Fo is the phase offset; and a PWM signal generator connected to the phase-locked loop unit to receive the frequency switching signal and generate a PWM control signal to drive the AC-to-DC converter.