一种高效率低功耗开关电源的实现  

Implementation of a High-Efficiency and Low-Power Switching Regulator IC

作　　者：胡黎强[1] 林争辉[1] 李林森[1] 

机构地区：[1]上海交通大学大规模集成电路研究所,上海200030

出　　处：《微电子学》2003年第2期136-139,共4页Microelectronics

基　　金：第28批中国博士后科学基金资助课题

摘　　要：　传统的PWM控制方式的开关电源芯片采用固定的工作频率,导致低负载工作状况下效率明显降低。提出了一种根据负载变化自动改变工作频率的脉频调制方式,该方式可大大提高芯片在低负载工作时的效率。采用脉频调制方式设计了一种boost型DC-DC变换芯片,芯片电路结构简单、功耗低、外部元件少。对主要电路和整个电源系统进行了模拟,给出了模拟结果。该器件采用3μmP阱双层多晶、单层金属CMOS工艺制造,可应用于各种便携式电子产品中,能延长电池的使用寿命。A pulsefrequency modulation (PFM) method is proposed in the paper, in which operating frequency varies automatically with the load A boost DCDC converter IC is designed with PFM, which has a simple circuit structure, low power consumption and fewer peripheral components The circuit improves efficiency significantly when operating with little load, especially with no load The circuitry of the chip and the whole DCDC converter system are simulated with EDA tool The chip is fabricated in 3μm Pwell, doublepolysilicon, singlemetal CMOS technology, and it can be used for portable electronics

关 键 词：开关电源 PWM控制方式 工作频率 脉频调制 CMOS 功率MOSFET DC-DC变换芯片 

分 类 号：TN86[电子电信—信息与通信工程]