Line Current Distortion Compensation Method for DCM/CRM Boost PFC Converters
Date Issued
2016
Date
2016
Author(s)
Chen, Yang-Lin
Abstract
A line current distortion compensation method is proposed in this dissertation for DCM/CRM boost PFC converter. This circuit features variable on-time (VOT) control, average current mode (ACM) control, and zero current switching (ZCS)/ zero voltage switching (ZVS)/ valley switching (VS)/ switching frequency limitation (SFL) functions. In order to increase efficiency, the ZVS/VS/SFL functions are usually needed, but in doing so, the line current is usually further distorted. In this dissertation, the mathematical analyses of the line current distortion caused by the DCM/CRM boost PFC converter with ZCS/ZVS/VS/SFL functions and the EMI filter are also conducted to account for the line current distortion. From the results of analyses, the ACM-based VOT (ABVOT) control for the DCM/CRM boost PFC converter is proposed. In addition, the noise-immunity sample-and-hold (S/H) approach of COT-based controller is proposed to replace the expensive multiplier which is usually needed for the conventional ACM-based control. The small signal model of the proposed circuit is also developed for the purpose of compensator design. The validity and the performances of the proposed ABVOT control with S/H approach is demonstrated by simulations and experimental results.
Subjects
power factor correction (PFC)
boost converter
average current mode (ACM)
constant on-time (COT)
variable on-time (VOT)
sample-and-hold (S/H)
multiplierless
Type
thesis
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