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The Short-Circuit Input Impedance as a Main Source of Input-Filter Interactions in a Regulated Converter
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| Author(s) |
Teuvo Suntio, Matti Karppanen |
| Abstract |
The input-filter design rules have been developed in late 1970s based on a small-signal equivalent circuit valid only for the direct-duty-ratio-controlled converters operating in continuous conduction mode. The design rules have been later generalized by applying the extra element theorem. The resulting formulation is highly theoretic and does not provide explicit formulas to solve all the required impedances. The open and closed-loop input impedances are usually considered as the base for the design. The paper shows consistently that the input-filter interactions affecting stability and the loadtransient
response are, however, caused by the closed-loop and short-circuit input impedances. The importance of the
short-circuit impedance is not fully recognized due to its implicit nature although it can be also physically measured. The theoretical findings are validated by comprehensive practical experiments based on the voltage-mode and peak-currentmode-controlled buck converters, which clearly point out also the physical reasons for the differences in the input-filter interactions in the voltage-mode and peak-current-mode-controlled buck converters. |
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| Filesize: | 437.4 KB |
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| Type |
Members Only |
| Date |
Last modified 2009-12-02 by System |
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