DC-DC电荷泵的研究与设计  

Research and Design of DC-DC Charge Pump

作　　者：曹香凝[1] 汪东旭[1] 严利民[1] 

机构地区：[1]上海大学微电子中心,上海200072

出　　处：《电源世界》2004年第11期20-22,26,共4页The World of Power Supply

摘　　要：本文以Dickson电荷泵的基本原理为出发点,研究了一种将正电压输入转为负电压输出的开关电容电路。由于开关电容的充放电特点,为确定电容时间常数,采用非交叠(nonoverlapping)时钟控制信号,避免了由于时钟交叠而造成的电容充电还未完成即对下一级电容进行放电的现象。同时,参考功率MOSFET的电容模型,通过增大驱动电路的电流减小了开关管的上升延时,提高了开关动作的速度,使转换效率得到明显提高。此电路结构简单、性能优良、易于集成,可广泛应用于输出负电压的电源产品中。In this paper we have developed a kind of charge pump, which can transform the positive voltage into the negative one according to the principles of Dickson charge pump. Because of the features of switch capacitor we should adopted nonoverlapping clock signal if we want to guarantee charge completely through the switching of power MOSFET. Furthermore, the drive currents of MOSFET have been improved to decrease the switching time and improve the efficiency of transform.

关 键 词：功率MOSFET 开关电容 电荷泵 转换率 

分 类 号：TM92[电气工程—电力电子与电力传动]