A Novel PWM Technique in Digital Control
Li Peng
Yong Kang
Xuejun Pei
Jian Chen
Coll. of Electr. & Electron. Eng., Huazhong Univ. of Sci. & Technol., Wuhan;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Feb. 2007
Volume: 54,
Issue: 1
On page(s): 338-346
ISSN: 0278-0046
INSPEC Accession Number: 9299057
Digital Object Identifier: 10.1109/TIE.2006.885135
Current Version Published: 2007-02-05
Abstract
One problem with microprocessor-based high-frequency pulsewidth-modulation (PWM) converters is the modulating resolution limitation caused by limited-time resolution of hardware timers. In this paper, a novel PWM technique, the double PWM (DPWM), is proposed. DPWM combines the advantages of low-frequency modulation and high-frequency switching in power conversion and resolves the contradiction between high frequency and accuracy in a digital control scheme. DPWM effectively increases the resolution in digital control, while the harmonics introduced by this method is found to be negligible. Theoretical analysis, characteristics, and design considerations are given, and they are verified by experiments on a 5.5-kW 20-kHz insulated-gate-bipolar-transistor boost-buck converter
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