Design and Simulation of High Frequency Inverter using unipolar PWM

SIMULINK Design with Unipolar PWM:

SAE TIR J2954 establishes a common frequency band using 85 kHz (81.39 - 90 kHz) for all light duty vehicle systems. In addition, four PH/EV classes of Wireless Power Transfer levels are defined. Future revisions may include even higher power levels: 3.7kW (WPT 1) specified in TIR J2954

Unipolar PWM:

The unipolar modulation normally requires two sinusoidal modulating waves vm and vm- which are of same magnitude and frequency but 180 0 out of phase. The two modulating wave are compared with a common triangular carrier wave vcr generating two gating signals vg1 and vg3 for the upper two switches S1 and S3. It can be observed that the upper two devices do not switch simultaneously, which is distinguished from the bipolar PWM where all the four devices are switched at the same time. The inverter output voltage switches between either between zero and +Vd during positive half cycle or between zero and –Vd during negative half cycle of the fundamental frequency thus this scheme is called unipolar modulation. The unipolar switched inverter offers reduced switching losses and generates less EMI. On efficiency grounds, it appears that the unipolar switched inverter has an advantage. (Unipolar and Bipolar PWM Inverter (ijirst.org))

Results: I tried to design a High Frequency inverter and the might be a huge chance for many modification and faults.

Unipolar PWM:

Inverter output: