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该文双向DC-DC变换器(BDC)的设计由PWM控制、驱动、功率变换及测控4大部分组成。PWM控制以TL494为控制核心,闭环调节电路占空比;PWM驱动由IR2111构成,驱动同步整流电路的开关管;功率变换采用同步整流电路为功率变换拓扑,实现DC-DC双向高效功率变换;测控电路以MSP430单片机为控制器,结合电流、电压采样电路,控制电路输出参数并显示。系统具有过流、过压保护功能,并能通过MSP430单片机实现高精度的程控。测试结果表明,采用同步整流电路能较好完成DC-DC功率双向变换,双向功率变换效率均达到95以上,同时还具有很强的抗扰动能力。
The design of bi-directional DC-DC converter (BDC) consists of PWM control, driving, power conversion and measurement and control. PWM control to TL494 as the control center, closed-loop regulation circuit duty cycle; PWM drive by the IR2111 constitute, the drive synchronous rectifier circuit; power conversion using synchronous rectifier circuit for the power conversion topology to achieve DC-DC bidirectional efficient power conversion; MSP430 microcontroller circuit for the controller, combined with current and voltage sampling circuit, the control circuit output parameters and display. System with over-current, over-voltage protection, and through the MSP430 microcontroller to achieve high-precision programming. The test results show that the use of synchronous rectifier circuit can be a better DC-DC power bidirectional conversion, bidirectional power conversion efficiency of more than 95, but also has a strong anti-disturbance ability.