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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%.
In order to realize the balanced distribution of converter current in parallel DC conversion power system, reduce the electric and thermal stress on the converter and improve the system reliability, a current sharing scheme with automatic master-slave control strategy is given and the scheme The key component of this design is the design of current sharing control chip.The current feedback loop is used in the design to adjust the output voltage, which reduces the influence of PCB board-level parasitic effect on the adjustment signal and proposes a start-up control circuit to improve the system Of the start-up sequence to accelerate the start-up phase of the current balancing process chip using 1.5μm BCD (Bipolar-CMOS-DMOS) process design to achieve an area of 3.6mm2. The application of the chip constitutes a DC-DC converter consisting of two, with 12V / 3A output power of the parallel power system.The test results show that the parallel power system at full load current sharing error less than 1%.