峰值电流模式变换器自适应斜坡补偿电路设计  

Design of Self-Adaptable Slop Compensation Circuit in Peak Current Mode Converter

作　　者：田锦明[1] 王经卓[1] 曹双贵[1] 胡全斌[1] 董自健[1] 樊纪山[1] 

机构地区：[1]淮海工学院电子系,江苏连云港222005

出　　处：《电子器件》2008年第2期480-483,共4页Chinese Journal of Electron Devices

基　　金：淮海工学院科研项目(Z2006038)

摘　　要：峰值电流模式变换器工作于CCM模式且D>0.5时,存在开环不稳定性等问题,必须进行斜坡补偿。针对常规的斜坡补偿方式所存在的缺陷,设计了一种补偿量自动适应输入输出电压变化的斜坡补偿电路。利用MOS管工作于线性区的压控电阻特性,实现了在整个占空比区间内自动适应、优化的斜坡补偿,与传统的设计相比,自适应斜坡补偿对系统带载能力、瞬态响应的负面影响减至最小,改善系统性能,增加系统稳定性,是进行斜坡补偿的最佳方案。最后给出仿真结果。It must be carried out slope compensation for peak current mode converter working in continued conduction mode and D〉0. 5, for it has the problems such as instability of open loop,etc. According to the defect of traditional slope compensation, a self-adaptable slope compensation circuit is designed, whose compensation amount varies with input and output voltage automatically. With the utilization of the voltage controlled resistor characteristics of MOS transistor, a self-adaptable and optimal slope compensation is realized in whole duty cycles. Compared with the traditional design, the negative effects of self-adaptable slope compensation on the system＇s output current capability and transient response are effectively reduced. System＇s performances are improved and system＇s stability is increased. It is the best scheme to carry but slope compensation. Finally, the simulation results are provided.

关 键 词：峰值电流模式 稳定性 自适应斜坡补偿 压控电阻 带载能力 瞬态响应 

分 类 号：TN433[电子电信—微电子学与固体电子学]