一种新的数字可调直流升压系统设计

摘要

At present the wide range boost system adopts mostly transformer, however it is always trapped in the problem of coupling and inaccurate boost, and cannot satisfy the requirement in the high precise filed. To solve this problem, we designed a boost system using the digital IC chip MAX1771 and programmable digital potentiometer AD5241, which has abilities of digital adjustable, wide range,and pulse frequency modulation (PFM) manner. This system achieved the multistage stable output from 12 V to 120 V. So, it can be applied to wide range boost field such as high voltage serial programming (HVSP) and intensity adjustment of medical equipment.%目前宽范围升压系统多采用变压器升压方式,由于在升压中存在耦合和不准确的问题,无法胜任在要求高精准升压系统中的要求.针对这一问题,采用MAX1771数字芯片和可编程数字电位器AD5241设计了一种数字可调的、宽范围的、脉频调制(PFM)的升压系统.实现了12～120V电压的多阶输出.可用于高压编程和医疗设备强度调节等宽范围升压场合.