Development, Based On The Dsp Phase-shifted Full-bridge High Frequency Link Inverter

This paper focuses on a High-Frequency Link inverter with Full-Bridge converter as its main circuit topology and DSP as its kernel controller. The design and implementation of the inverter is described in detail.The paper first introduces the research work that has been done home and abroad on the High-Frequency Link inverter. High power density as well as high efficiency has always been the goal to pursue in the field of modem electric power converters. High-Frequency Link technology has great advantages in achieving this goal and provides fundamental impetus to the research work done in this paper.The main scheme of the inverter discussed in the paper is DC (low voltage)/AC (low voltage high frequency SPWM pulse)/AC (high voltage and low frequency sine wave). By well combining the high frequency pulses and the basic SPWM wave, the scheme enables the inverter to have only two levels of power conversion and therefore offers a simple structure and few harmonious waves in the output.Full-Bridge converter is the main circuit topology of the inverter. Due to many of its advantages, it has been the mainstream topology adopted by large capacity, high performance power converters. This paper putsforward a new switching technology--- the phase-shift SPWM soft switch.This technology not only makes it possible to turn on the power switch at zero voltage condition and reduce the switching wastage, but also accurately produce the High-Frequency SPWM pulses. It is a good combination of the traditional phase-shift ZVT-PWM soft switch and the SPWM technology.The inverter is a small independent system. Therefore, to achieve a good performance both statically and dynamically, closed loop control method has to be applied. The paper takes advantage of a single close-loop control method based on voltage feedback, and enables the inverter to produce steady sine waves by the digital PID adjuster designed.Being the most state-of-the-art single-chip microprocessor, DSP exhibits a superior functionality, high processing speed and reliable performance, and therefore has a wide application prospect. The design of the kernel DSP control circuit as well as all the software modules of the system is discussed.Experimental results of the Full-Bridge High-Frequency Link Inverter are also presented and discussed in the paper.