A comparative study of analog voltage-mode control methods for ultra-fast tracking power supplies

被引:6
作者
Hoyerby, Mikkel C. W.
Andersen, Michael A. E.
机构
来源
2007 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE, VOLS 1-6 | 2007年
关键词
D O I
10.1109/PESC.2007.4342495
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This paper presents a theoretical and experimental comparison of the standard PWM/PED voltage-mode control method for single-phase buck converters with two high-performance self-oscillating (a.ka. sliding mode) control methods. The application considered is ultra-fast tracking power supplies (UFTPSs) for RF power amplifiers, where the switching converter needs to track a varying reference voltage precisely and quickly while maintaining low output impedance. The small-signal analyses performed on the different controllers show that the hysteretic-type controller can achieve the highest loop gain, leading to superior output impedance performance in the UFTPS application; this is explained using a recently proposed small-signal model for the hysteretic comparator. The analytical findings are verified experimentally as well as by simulation. Experimentally, the use of hysteretic self-oscinating control is shown to reduce the worst-case UFTPS output impedance by a factor of 10.
引用
收藏
页码:2970 / 2975
页数:6
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