Boost Voltage Single Phase Full Bridge Inverter with No Voltage Drop Based on Switched Capacitor

Hao Qiang,Tian Xu,Zhenyu Wu,Jianfeng Zheng,Pengcheng Kong,Shuren Mao

doi:10.3390/en14123466

Abstract

In this paper, a voltage-boost-type non-voltage drop single-phase full-bridge inverter connected to a switched-capacitor structure is proposed. The output voltage of the inverter is controlled by the pulse width modulation of a DSP to control the lead and break of the active switches. The full-bridge switches work at low frequency; the other switches work at high frequency. The inverter uses two capacitor modules to charge and discharge alternately so as to overcome the problem of voltage drop on the output side of the inverter in the transition stage from series capacitor discharge to parallel charge. By analyzing the charge–discharge characteristics of the RC charge–discharge circuit, the capacitor charge–discharge cycle can be adjusted to alter the output voltage within a certain range. The results from the physical construction verify the Simulation results achieved well, which demonstrates satisfactory performance that supports the verification of the above theory.

Highlights

Fossil fuels are the world’s main resource for energy production [1,2], with the use of coal, oil, and natural gas underpinning the progress of human civilization and its economic and social development since the 19th century
It has become even more pressing to seek abundant, clean, and pollution-free renewable energy sources, with photovoltaic power generation, wind power generation, and tidal power generation becoming the mainstream in alternative clean energy sources widely adopted and valued by society [3,4,5]
The traditional step-up inverter based on switched capacitors uses the mechanism of capacitors to be charged in parallel and discharged in series in order to achieve the boost effect

Summary

Introduction

Fossil fuels are the world’s main resource for energy production [1,2], with the use of coal, oil, and natural gas underpinning the progress of human civilization and its economic and social development since the 19th century. The use of fossil fuel energy generates huge amounts of gases, such as CO2, which intensify the greenhouse effect, causing thermal pollution and threatening the global ecology. It has become even more pressing to seek abundant, clean, and pollution-free renewable energy sources, with photovoltaic power generation, wind power generation, and tidal power generation becoming the mainstream in alternative clean energy sources widely adopted and valued by society [3,4,5]. With the development of power and electronic technologies, the industry has been putting an increasing demand on the efficiency of the inverter system and the characteristics of the output voltage waveform [7,8]. It is impossible to directly use distributed electric energy to supply power to the load [9,10,11]

Objectives

Results

Conclusion