Ripple determination for switch-mode DC/DC converters

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Ripple determination for switch-mode DC/DC converters

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The state-space average model of a DC/DC convertor is used directly to obtain expressions for the ripple in any state or output of the model. This is used to rederive the current-ripple trade-off conditions in the Ćuk convertor in a more straightforward fashion. In addition, it is shown that the buck convertor with input filter inductor and storage inductor coupling, and boost convertor with output filter inductor and storage inductor coupling, have similar ripple behaviour to the Ćuk convertor at one port when the other port ripple is zero. For the case of equal input and output current ripples, the coupled inductor boost and buck are shown to be superior to the Ćuk convertor.

Inspec keywords: power convertors; power supply circuits

Other keywords: output filter inductor; boost convertor; input filter inductor; ripple determination; switch-mode DC/DC convertors; Cuk convertor; current-ripple trade-off conditions; buck convertor; state-space average model; storage inductor coupling

Subjects: Power electronics, supply and supervisory circuits; Power convertors and power supplies to apparatus

References

    1. 1)
      • Massey, R.P., Snyder, E.C.: `High voltage single-ended dc-dc converter', IEEE Power Electronics Specialist conference, 1977 record, p. 156–159.
    2. 2)
      • Ćuk, S.: `Switching DC-to-DC converter with zero input or output current ripple', IEEE Industry Applications Society annual meeting, 1978 record, p. 1131–1146.
    3. 3)
      • M. Grötzbach . Analysis of periodically switch controlled lowpass systems by continuous approximation models. Automatica , 321 - 344
    4. 4)
      • R.D. Middlebrook , C. Slobodan . A general unified approach to modelling switching converter power stages. Int. J. Electron. , 521 - 550
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