The Influence of Passive Snubber Circuits on Conducted Emission of Switching Power Converters
| Autor: | Hung-chi Lee, 李鴻麒 |
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| Rok vydání: | 2007 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 95 In this thesis, three kinds of representative snubbers are discussed, including R-C, R-C-D and L-C-D snubbers, respectively. R-C snubber, a dissipative snubber, associating with circuit leakage inductance is to form a R-L-C circuit to eliminate overvoltage and ring wave around the power device so as to suppress ring wave EMI. R-C-D snubber, a dissipative and polarized snubber, acts as a capacitor to prolong the rise time of voltage waveform around the power switch so as to suppress EMI resulted from rise time changed by voltage variation in power regulation. The last L-C-D snubber, a lossless snubber, uses inductor and resonant circuit to prolong rise time of current waveform around the power device, in which the capacitor is used to prolong rise time of the voltage waveform. It is appropriate for suppressing EMI resulted from rise time changed by voltage and current variations in power regulation. The investigation for R-C snubber is appropriate for all kinds of converters about ring wave suppression. R-C-D snubber is appropriate for all kinds of converters about voltage rise time change. L-C-D snubber is appropriate for buck and boost converters about rise time changes of current and voltage. Three kinds of snubbers are respectively applied in PFC, forward and flyback converter topologies by way of mathematics analysis and simulation for achieving a unified relationship between the mentioned snubbers, including waveform comparison and spectrum distribution. In this thesis, experiments for the three kinds of snubber circuits applied in PFC, forward and flyback converters are examined. Their performances are quite close to the theoretical predictions. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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