摘要
针对传统方法由两个单向DC-DC变换器构成的电池储能装置,存在效率较低、功能少、重量较大、电路复杂等问题,设计了一个双向DC-DC变换器可实现对锂电池高效率的恒流充电和恒压放电。主控单元以STC12C5A-60S2单片机为核心,采用同步整流Buck-Boost电路,驱动部分以IR2104为中心控制功率MOS管。恒压充电范围1~2 A,电流步进值不大于0.1 A,电流控制精度不低于5%,充电效率大于95%;恒压放电电压30±0.5 V,放电效率大于90%;充放电过程可程控转换,具有过充保护功能。实验结果表明,整个设计样机实现电路简单,充放电效率高,重量不超过500 g,具有一定的实际应用价值。
In order to solve the problem of low efficiency, low function, large weight and complex circuit, a bidirectional DC-DC converter is designed to realize the high efficiency of constant current charging and constant voltage discharge for lithium batteries. The main control unit is based on the STC12 C5 A-60 S2 microcontroller and uses a synchronous rectifier Buck-Boost circuit. The drive part controls the power MOS tube with IR2104 as the center. Constant voltage charging range 1~2 A, current step value not more than 0.1 A, current control accuracy not less than 5 %, charging efficiency greater than 95%. The constant voltage discharge voltage is 30±0.5 V, and the discharge efficiency is greater than 90%. The experimental results show that the whole design prototype has simple circuit, high charging and discharging efficiency, and no more than 500 g in weight, and has a certain practical application value.
引文
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