The Design And Implement Of Parallel Inverter For Vehicle

With the improvement of the quality of people’s lives, car sales tend to increase day by day.Saloon cars and yachts that be seen as luxury things have also been appearing in people’s lives, and they have rendered continuous upward trend. Car inverter is important in providing saloon cars、yachts and other transport equipment with Continued energy.The research and design of the car inverter gradually attracts people’s attention. At the same time, energy conservation, efficient use of energy and the new energy development and utilization have become a hot topic in today’s society. In this context, the inverter technology comes into being and continues to mature, the car inverter as a product is gradually coming into people’s lives.This design introduces a new designed parallel push-pull inverter. The inverter has a24V battery input to achieve an output of220V. The active power of the inverter is3KW. with further expansion in the power function. The high efficiency of the inverter can make full use of the battery energy in saloon cars and military vehicles.It can also drive the vehicle lighting equipment, communications equipment, air conditioning and television equipment. At the same time, the inverter plays an important role in the use of solar and wind energy. Such as wind and solar energy development project, how the solar panels and wind turbines achieve the battery charging and the use of battery power is the most important questions. The inverter is the primary means to solve the second problem.In the design of inverter,there are three steps in transformation of low voltage DC to AC electricity: the first level BOOST for the open-loop voltage amplification, uses the push-pull circuit.Different from the traditional push-pull process, push-pull in this design uses ZVS soft-switching technology.There’s a small inductor to achieve zero-voltage on/off of the MOSFET.The first stage of amplification efficiency and voltage magnification eliminates the filter inductor of output stage, reducing the cost and the volume of the module.In the case,1.5KW of single module, first-class push-pull full loads efficiency of89%, to achieve smaller circuit and simple control circuit:the second level BOOST module replacing the IC.uses32-bit ARM chip STM32to generate the PWM.Internal12-bit AD of the STM32provides current and voltage sampling. Voltage loop controls the stability of the parallel output voltage. Current loop achieves parallel current of multiple modules; the third step is the inverter module. The design of hardware is full-bridge inverter and software of SPWM.Both of hardware and software provide inverter of360V DC to220V/50Hz AC. The three modules complete the whole design of the inverter.The circuit is simple, low cost and overall conversion efficiency of85%or more.Finally, we analyze the various test parameters on the vehicle parallel inverter to verify the feasibility of car inverter and its efficiency.