Communication-less Carrier Synchronization Method for Variable Frequency PWM

The variable frequency PWM (VFPWM) can effectively reduce EMI of the output current. Based on that, this digest will propose a communication-less carrier synchronization for VFPWM (CS-VFPWM). Doing so, the switching harmonics can be further attenuated among parallel inverters. The basic structure and principles of the communication-less CS-VFPWM is presented in this digest. Then, the down-scale prototypes are used to verify the proposed method.