电气自动化专业毕业论文--直流开关稳压电源均流系统设计.docVIP

摘 要 3902集成IC将两个相同的UC3843模块并联为自动均流电路，再利用ADC0809芯片完成AD转换并将转换后的数据传递给单片机，最后用单片机AT89RC52(51)完成AD转换后的电压数值在数码管上显示。 实验证明本系统输出电压具有一定可调范围，噪声、纹波电压低和DC-DC转化效率高的特点。除此之外，该系统还设计了过流保护功能，在电路排除过流故障后，电源具有自动恢复到正常的特点。 关键词：开关电源，Boost DC-DC转换，并联均流，AD转换 Dc switching power supply all flow system design Abstract Electronic equipment in daily practical application process, often because of the use of a DC power supply output parameters ( such as: power, voltage, current) can not fulfill the field requirement and breakdown, this often causes the whole system efficiency is low, device from overheating and even damage, so in practice usually employs multiple power parallel operation. Parallel and current sharing technology is currently the focus of development of power electronic technology, switching power supply parallel current sharing system utilizes a plurality of power supply modules in parallel, by changing the number of parallel modules to meet the needs of different power load, each module can be very good to meet the power performance, weight, size, efficiency, transport and reliability requirements. In this paper application of isolated type DC-DC power conversion technology to complete the switch regulated power supply (boost type Boost ) parallel and current sharing of design and production. The system consists of four modules, which first by UC3843 control chip consisting of DC voltage step-up converter, and then use UC3902integrated IC two identical UC3843modules in parallel for equalizing circuit, then the use of ADC0809chip AD and converting the transformed data are transmitted to the single chip microcomputer, finally by AT89RC52 single chip microcomputer (51) to complete the AD converted voltage values in the digital tube display. System output voltage with adjustable range, noise, low ripple voltage and DC-DC conversion efficiency. In addition, the system also has an overcurrent protection function, the circuit to preclude overcurrent fault, power supply is automatically re