Design methodology of a non-invasive sensor to measure the current of the output capacitor for a very fast non-linear control

被引：26
作者：
Huerta, Santa C. [1 ]
Alou, P. [1 ]
Oliver, J. A. [1 ]
Garcia, O. [1 ]
Cobos, J. A. [1 ]
Abou-Alfotouh, A.
机构：
[1] Univ Politecn Madrid, Ctr Elect Ind, Madrid, Spain
来源：
APEC: 2009 IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION, VOLS 1- 4 | 2009年
关键词：
D O I：
10.1109/APEC.2009.4802754
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The combination of non-linear control and linear control proposed in [1] has a very fast transient response (voltage step from I V to 1.5 V in 2 Its). In order to achieve this fast transient response the non-linear scheme is based on measuring the current of the output capacitor of a Buck converter. The design of this current sensor is complex due to parasitic effects such as component tolerances (bandwidth and dc gain of the Op-Amp), aging, temperature variation, etc. A design methodology for this current sensor is proposed regarding all these effects. The sensing circuit is designed to mirror the actual capacitor current with a trans-impedance amplifier by matching phase and scaling impedances of the RLC network (C, ESR and ESL of the output capacitor). The proposed methodology has been validated by means of a buck converter switching at 5 MHz. Experimental results validate that the current sensor behaves appropriately under voltage and load steps.
引用
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页码：806 / +
页数：2
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