Fast control technique for high frequency (5MHz) DC/DC integrated converter

Konferenz: CIPS 2010 - 6th International Conference on Integrated Power Electronics Systems
16.03.2010 - 18.03.2010 in Nuremberg, Germany

Tagungsband: CIPS 2010

Seiten: 5Sprache: EnglischTyp: PDF

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Viejo, M. del; Alou, P.; Oliver, J. A.; García, O.; Cobos, J. A. (Universidad Politécnica de Madrid, Centro de Electrónica Industrial, Madrid, Spain)

A switching frequency of 5 MHz allows the integration in a chip of a low power (10W) DC/DC converter. Although this switching frequency would make feasible a voltage mode control with 1MHz bandwidth, the parasitics and robustness don’t allow such a high frequency bandwidth. This paper proposes a fast control technique that helps to optimize the dynamic response of high frequency DC/DC converter. The control proposed and analyzed in this paper is based on the peak current mode control of the output capacitor current of a Buck converter. The output capacitor current loop provides fast dynamic response to the control since it behaves as a feed-forward of the load current while the voltage loop provides accurate steady state regulation. Experimental results have validated the fast dynamic response of the proposed control under load steps.