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.
出处
《电子器件》
CAS
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)
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
peak current mode
stability
self-adaptable slop compensation
voltage controlled resistor
output current capability
transient response
