高精度均流控制器芯片设计

Design of novel precise load share controller

为解决在并行电源系统中电源模块之间电流和热应力的不均衡问题，提出一种高精度均流控制器芯片设计．该均流控制器采用主从式自动控制结构，能够对并行电源模块进行控制协调，实现负载电流和热应力的平衡．该均流控制器还具有若干新功能，如均流负载总线短路出错保护和芯片启动时的使能功能等．此外，通过引入定制的启动控制逻辑，使并行电源系统的启动响应得到改善．仿真结果表明，所设计的均流控制器芯片已达到预期设计目标，满负载运行时的均流误差控制在1％以内．电路采用1．5μm BCD（bipolar-CMOS-DMOS）工艺设计实现，面积为3．6mm^2．

A precise load share controller integrated circuit （IC） was proposed to solve uneven distribution of currents and thermal stresses among power modules in paralleled power systems such as parallel multiple independent power supplies or dc-to-dc modules. By using the automatic master-slave control （MSC） technique, functions necessary to these systems such as even current and thermal stress distribution controlling were achieved. Some new functions including bus short fault protection and enable function were added to the chip. By introducing special start-up control logic, its start-up timing was obviously improved. Simulation results showed that the main expectation for the controller was realized and the current share error at full load was controlled within 1%. In addition, the chip was designed and realized in 1.5μm bipolar-CMOS-DMOS （BCD） technology with an area of 3.6 mm^2.