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Dynamical Characterization of Voltage-Mode Controlled Buck Converter Operating in CCM and DCM
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| Author(s) |
Mikko Hankaniemi, Matti Karppanen, Teuvo Suntio |
| Abstract |
The paper investigates the dynamical differences
imposed by the continuous and discontinuous operation
modes under direct-duty-ratio or voltage-mode control. The
safe load and source profiles for CCM and DCM converters
are derived. It is shown e.g. that the DCM converter is more
prone to instability caused by the load, while the CCM
converter is sensitive to capacitive loads. The safe source
profiles are shown to be almost the same for both converters
but the source interactions caused e.g. by EMI-filter are
shown to be smaller in the DCM converter at the vicinity of
the converter output filter resonant frequency. Even if a
larger magnitude variation as function of input voltage is
observed in the control-to-output transfer function in DCM,
the variation of magnitude in the loop gain can be made
equal for both conduction modes by a proper controller
design. |
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| Filename: | T2-405.pdf |
| Filesize: | 451.1 KB |
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| Type |
Members Only |
| Date |
Last modified 2007-03-13 by System |
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