1000W Mobile Power Charge And Discharge System

Charger, battery, power inverter were the main components of a large AC output mobile power charging and discharging system. How to make these three components safely, efficiently, long-lifely work was the key to the system design. In this paper according to the lead-acid battery charge and discharge characteristics the charger and the inverter were designed.And for specific users to optimize the design of the system.The thesis was divided into three main parts.The first part analyzed the charge and discharge characteristics of lead-acid batteries, which provided a theoretical basis for the design to the charger and the inverter. And a total capacity and design parameters of the system were described and so on. The second part introduced the design principles of the charger, including the design of the power factor correction circuit and DC / DC phase-shifted full-bridge circuit design, the auxiliary power supply and control circuit design of the module. By the power factor correction, at full load the system power factor PF(Power Factor) can reach 0.98. By soft-switching technology and synchronous rectifier technology, the full-bridge DC / DC part could achieved 94% efficiency at full load.And the total charging system efficiency was 89%. The third part introduced the principle of full bridge DC / AC inverter circuit. Unipolar modulation principle was analyzed and the characteristics of the four-driven approach were compared. And the relevant protection circuit was designed.Firstly modular design of the system was done, and then on-line debugging was carried out.A 600 W charger, 1000 W inverter prototype production were completed.The circuit waveform analysis, test parameters of the various parts of the system operation were offered. These all achieve the desired requirements.And proposed further questions to be optimized such as the input of the auxiliary power shloud put into the output of the power factor correction circuit so that the efficiency could be further improved and more new funcuions were worth looking forward to.