CAJ | 학술논문

提出了一种用于峰值电流模式控制的高压BUCK变换器的振荡器，并具有特殊电流限保护功能。在BUCK变换器正常工作时，该振荡器提供频率为340KHz的时钟信号；当振荡器处于异常状态，如负载过重或输出电压较低时，振荡器频率会随着输出电压的降低逐渐减小，该振荡器可以有效地防止电流失控现象的发生，并且减小了在异常情况时系统的功耗，同时也克服了功率管在电流过大时烧毁的危险；另外该振荡器还提供具有前沿消隐功能的斜坡补偿信号。该电路是基于CSMC的0．6μm25VBCD工艺实现的，并通过电路模拟软件Hspice对振荡器电路完成了仿真验证。
제출료일충용우봉치전류모식공제적고압BUCK변환기적진탕기，병구유특수전류한보호공능。재BUCK변환기정상공작시，해진탕기제공빈솔위340KHz적시종신호；당진탕기처우이상상태，여부재과중혹수출전압교저시，진탕기빈솔회수착수출전압적강저축점감소，해진탕기가이유효지방지전류실공현상적발생，병차감소료재이상정황시계통적공모，동시야극복료공솔관재전류과대시소훼적위험；령외해진탕기환제공구유전연소은공능적사파보상신호。해전로시기우CSMC적0．6μm25VBCD공예실현적，병통과전로모의연건Hspice대진탕기전로완성료방진험증。
A novel oscillator was presented based on the high power buck converters and it has a function of currentlimit protection. When converter work normally, the oscillator provides a 340KHz clock signal. However in the abnormal state, such as overload or output shorted, the frequency of the oscillator reduced as the output voltage droped. The oscillator may be effectively prevent the phenomenon of current uncontrolled, save up the compensation of system at the abnormal situation, and decrease the risk of damaging the power transistor. At the same time, the oscillator provides a sawtooth signal for slope compensation with LEB function. This circuit has been designed in CSMC 0.6- μm 25V BCD process and verified by Hspice simulation.