应用于并行直流转换电源的均流控制芯片设计

为实现并行直流转换电源系统中转换器电流的均衡分布,降低转换器承受的电、热应力,提高系统可靠性,给出一种采用自动主从控制策略的均流方案,并给出了方案实现的关键部件--均流控制芯片的设计.设计中采用电流反馈环路对输出电压进行调整,降低了PCB板级寄生效应对调整信号的影响;并提出一种启动控制电路用以改善系统的启动时序,加速了启动阶段的电流均衡过程.芯片采用1.5μm BCD(Bipolar-CMOS-DMOS)工艺设计实现,面积为3.6mm2.应用该芯片构成了一个由两个直流转换器组成,具有12V/3A输出能力的并行电源系统.测试结果表明,该并行电源系统满负载时均流误差小于1%.

Current Share Control IC Design for Paralleled DC/DC Converters

To keep even current distribution among DC/DC converters in a paralleled power system,an automatic master-slave control (AMSC) current sharing scheme is presented,which was implemented by a current share control IC. A current feedback loop for output voltage adjustment is proposed for low signal distortion. Moreover, a special startup control logic is designed to improve startup timing and to speed up the initial current sharing. It was completed in 1.5μm bipolar-CMOS-DMOS (BCD) technology with an area of 3.6mm2 . Using it,a paralleled power system of two DC/DC converters capable of outputting 12V/3A was built. Experimental results show that the current sharing error at full load is kept within 1%.