Low-Loss Inverter Design Using Ultrasonic Pulse Width Modulation

Abstract

In this study, an inverter was designed with high power, very low loss, and high accuracy with a steady power factor. Due to the use of ultrasonic pulse width modulation (PWM) with frequencies 20–500 kHz, com-pound splicing (CS), and connection to a three-phase dynamic load, this work is considered an innovation. The use of an oscillator circuit with a high frequency of 4 GHz as a microcontroller is a novelty; in addition, a designed ADC is utilized to increase accuracy and reduce losses by controlling the input of the voltage, as well as contributing to the reduction of loss brought on by the characteristics of the voltage source inverters (VSIs), such as dead time determined by the excess voltage or voltage drop in the inverter and abnormal circumstances for the load current, such as short-circuit current in the production phase. The innovation relates to the inverter’s load sensing circuit, current smoothing during operation, reaction spontaneous power factor enhancement with the inverter, and compensation of active and reactive power of passive devices. This invention contributes to the advancement of DC-to-AC power converters through the achievement of extremely low losses, high precision, and lightweight construction. An accuracy of 99% was obtained, and the total harmonic distortion (THD) of the voltage and current was 0.1% → 0.8%. A power MOSFET (IXFX120N65X) was used along with an FPGA to improve control over the creation of ultrasonic PWM signals with the programmable peripheral interface (PPI) 8255A for regulatory work. The results serve as proof of this.