Design And Testing Of The High-frequency Full-bridge Inverter Power

Inverter power source because of its excellent performance is expected to replace the rotary converter unit. Currently, the core part of the inverter technology is the inverter and the control section, the study of automatic control technology of inverter power supply has important practical significance. The company has a resistive capacitive load, and a power inverter needs to be designed to drive it. When the load reaches the maximum power output, the best results can be reached, so the power needs to make a number of analysis and testing on the resonance point of the load. When communicating with this enterprise, it is known that the resonant point of this load is between150K and350K. Therefore, we have designed an inverter power supply that has a maximum operating frequency up to500K, easy for future adjustment and testing.The main control part of the power inverter is completed by the master chip UCC3895, and the main inverter part is the full-bridge inverter structure. In the design process of this power inverter, the soft switch technology is mainly used. The soft switch technology is the key point and hot spot of inverter power research in recent years, and this technology solves the problem that the heating problem of the power tube in the switching process, which has always been troubling the inverter power technology. It effective guarantees the continuous working time of the inverter power supply, and enhances the performance of the inverter power supply.The design, production and testing of this inverter power supply module has two editions. The first edition is the initial attempt, the second edition makes improvement on the basis of the first edition, and the final version is delivered. The repeated testing, improvement and debugging of the first edition have provided the redesign of the second edition with complete experimental data, laying the foundation for the second edition to reach the expected objective.In the design process of the second edition, the problem of PCB design is emphasized again, and the official Layout instructions of TI are carefully read and researched. The second edition has made great changes on the PCB design, the laying and layout of the device location are conducted according to the official requirements strictly, the connection and filtering problem of the GND and PGND are paid special attention to, and the RC filtering structure is added according to the official requirement of TI, and finally achieves good results.The final overall power supply testing uses the step-by-step testing, eliminating interference step by step. All the tests start from the only chip testing, and then use the form of connecting an analog load, connect loads that are actually needed finally and observe the final test results. When connecting the actual load, the frequency used ranges from high to low, and finally reaches a stable testing way. Its testing performance has high improvement, compared with frequency used originally that ranges from low to high. In actual work process, this is a discovery of the test on this kind of resistive capacitive load, and at the same time is a new change of the working process of inverter power supply module.The final test result is good; the power inverter module is working, continuous working time of up to five minutes, the peak output power of more than4kilowatts.