Patent ID: 8279645

Claim:
A semiconductor device for synchronizing a plurality of variable frequency power converters, each variable frequency power converter having a switching frequency, the semiconductor device comprising: a plurality of synchronization circuits, each synchronization circuit corresponding to a respective one of the plurality of variable frequency power converters; and a control circuit coupled to and coordinating the plurality of synchronization circuits; wherein the plurality of synchronization circuits and the control circuit are operable to synchronize the switching frequencies of the variable frequency power converters to each other; wherein each synchronization circuit is operable to: receive a first input signal indicative of the beginning of a switching period for the corresponding variable frequency power converter; receive a second input signal indicative of the end of the switching period for the corresponding variable frequency power converter; generate a first output signal for directing a pulse width modulation of the corresponding variable frequency power converter; and generate a synchronization control signal for coordinating a phase relationship with another one of the plurality of synchronization circuits.