Conference Paper

Practical Implementation of a High-Frequency Current Sensing Technique for VRM

Univ. Paul Sabatier, Toulouse;
DOI: 10.1109/ISIE.2007.4374693 Conference: Industrial Electronics, 2007. ISIE 2007. IEEE International Symposium on
Source: IEEE Xplore

ABSTRACT Inductor current tracking in high-frequency DC/DC converters is not effortless, especially when high current and low voltages loads are demanded. This paper proposes a simple technique to obtain a good resolution in the inductor current measurement obtaining an equivalent voltage image which can be used for a high-frequency PWM controller. This strategy of measurements is generic and it has been validated by simulations. Our experimental results are obtained with very low output voltages and several loads between 10mA to high currents covering the needs of portable and embedded VRM applications.

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    ABSTRACT: Inductor current tracking in high-frequency DC/DC converters is not effortless, especially when high output currents and low output voltages are demanded by the load. This paper proposes a guideline to design proper digital current-mode controlled (CMC) point-of-load (PoL) converts obtaining good accuracies in the inductor current tracking. The main idea is to obtain a equivalent voltage image of the inductor current which can be used for the digital controller to generate the converter control law. This strategy of measurement is generic and it has been validated in previous works. Thus, our experimental results validate the converter design process.
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    ABSTRACT: To track the inductor current in high-frequency dc/dc converters is not effortless, particularly when high output currents and low output voltages are demanded by the load. This paper proposes a simple technique to obtain a good accuracy in the inductor current measurement in voltage regulator module (VRM) applications. The main idea is to obtain an equivalent voltage image which can be used for the high-frequency pulsewidth modulation controller to generate the converter control law. This strategy of measurement is generic, and it has been previously validated by simulations. Afterward, some experimental results are obtained by using several prototypes of dc/dc converters delivering a very low output voltage and owning several loads from 10-mA to 100-A currents. This wide range covers the power requirements of portable and embedded VRM applications. Moreover, this sense technique has also been validated in a digital high-frequency current-mode-controlled dc/dc converter.
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