Analysis of Capacitor Ripple Current and Phase Current Instability of Multi-Phase Interleaved Critical-Mode Power-Factor-Correction Circuit
Date Issued
2009
Date
2009
Author(s)
Liu, Chih-Yuan
Abstract
In recent years, multi-phase interleaved critical-mode power factor correction (PFC) circuits have become popular for medium-to-high power level application. This circuit features low ripple current for both the input and the output capacitors, absence of diode reverse recovery problems and relatively high power efficiency. This thesis deals with three aspects of such a PFC converter configuration. The first aspect is the functional relationship of capacitor ripple currents to circuit parameters and working conditions. Analysis was performed to find out the functional relationship. The second aspect is the effects of converter inductance mismatched on the phase current. Discussions about phase current imbalance due to four different control methods were given. And the third aspect is effects of delay time error on the phase current imbalance due to different control methods. Four control methods were analyzed, and new control methods were proposed to reduce on alleviate the current balancing problems. In all three aspects, simulations were conducted to verify the results obtained my theoretical analysis.
Subjects
multi-phase
interleaving
PFC
Type
thesis
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ntu-98-R96921017-1.pdf
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