双向DC-DC直流变换器设计优化
首发时间:2025-04-03
摘要:针对双向DC-DC直流变换器充电模式效率低、电流控制精度不高的问题,对双向DC-DC直流变换器的电池储能装置进行优化设计。该装置包括双向DC-DC主电路、测控电路和辅助电源,主电路拓扑为同步整流式非隔离型降压/升压(BUCK/BOOST)电路,采用STM32F103ZET6作为核心控制器,应用软件补偿网络、数字校准技术和比例-积分-微分(proportional-integral-derivative,PID)数字闭环控制技术,实现能量的双向流动。测试结果表明,优化后装置充电模式转换效率高达95%,电流控制精度低于1%,电流变化率低于1%,放电模式转换效率高达96%,大大提高了电能转换效率和电流控制精度。
关键词: DC-DC变换器 BUCK/BOOST PID数字闭环 转换效率
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Design optimization of bidirectional DC-DC DC converter
Abstract:As a countermeasure to the problems of low charging mode efficiency and low current control accuracy in bidirectional DC-DC converters, an optimized design of the battery energy storage device for bidirectional DC-DC converters was proposed. The device includes a bidirectional DC-DC main circuit, a measurement and control circuit, and an auxiliary power supply. The main circuit topology was a synchronous rectifier non isolated buck/boost (BUCK/BOOST) circuit and STM32F103ZET6 was employed as the core controller. Bidirectional energy flow was achieved via applying software compensation network, digital calibration technology, and proportional-integral-derivative (PID) digital closed-loop control technology. The results show that the charging mode conversion efficiency is as high as 98%, the current control accuracy is not less than 3%, the current change rate is not greater than 1%, and the discharge mode conversion efficiency is as high as 97%. The optimization of the device greatly improves the efficiency of energy conversion and the accuracy of current control.
Keywords: DC-DC converter BUCK/BOOST PID digital closed-loop conversion efficiency
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