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A novel three‐phase, current‐fed ZCS‐PWM converter incorporating a single resonant DC link soft commutation snubber
Author(s) -
Konishi Yosihiro,
Baba Naoya,
Ishibashi Masaki,
Nakaoka Mutsuo
Publication year - 2000
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/1520-6416(200008)132:3<57::aid-eej8>3.0.co;2-9
Subject(s) - snubber , commutation , pulse width modulation , capacitor , control theory (sociology) , rlc circuit , converters , electronic engineering , computer science , physics , engineering , voltage , electrical engineering , control (management) , artificial intelligence
This paper presents a novel prototype three‐phase current‐fed PWM converter with a switched‐capacitor‐type resonant DC link commutation circuit operating with a new optimum PWM pattern strategy, designed with consideration for a low‐pass filter. This converter can operate based on the principle of zero current soft‐switching commutation. First, the steady‐state operating principle of this converter with a new resonant DC link snubber circuit is described in relation to an equivalent operating circuit, together with the practical design procedure of the switched‐capacitor‐type resonant DC link circuit. Second, the three‐phase current‐fed PWM converter with the switched‐capacitor‐type resonant DC link circuit is discussed from a theoretical viewpoint based on a design example. An actively delayed time correction method to compensate distorted currents due to a relatively long resonant commutation time is newly implemented in the open‐loop control scheme so as to obtain a new optimum PWM pattern. Finally, an experimental setup of this converter is demonstrated in a laboratory to confirm the zero current soft‐switching commutation of this converter. Comparative evaluations between current‐fed hard‐switching PWM and soft‐switching PWM converters are implemented from the viewpoint of PWM converter characteristics. © 2000 Scripta Technica, Electr Eng Jpn, 132(3): 57–67, 2000