Title :
A Novel PWM Technique in Digital Control
Author :
Peng, Li ; Kang, Yong ; Pei, Xuejun ; Chen, Jian
Author_Institution :
Coll. of Electr. & Electron. Eng., Huazhong Univ. of Sci. & Technol., Wuhan
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
Keywords :
PWM power convertors; digital control; insulated gate bipolar transistors; power transistors; switching convertors; 20 kHz; 5.5 kW; PWM technique; digital control; high-frequency switching; insulated-gate-bipolar-transistor boost-buck converter; low-frequency modulation; microprocessor-based high-frequency pulsewidth-modulation converters; Digital control; Digital modulation; Frequency modulation; Hardware; Power conversion; Pulse width modulation; Pulse width modulation converters; Space vector pulse width modulation; Switching frequency; Timing; Digital control; high frequency; pulsewidth-modulation (PWM) technique; resolution;
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2006.885135
