Three-level soft-switched DC-to-DC converter and single-phase, single-stage, three-level AC-to-DC converter |
Posted on:2008-08-23 | Degree:M.A.Sc | Type:Thesis |
University:University of Victoria (Canada) | Candidate:Dharmarajan, Vimala | Full Text:PDF |
GTID:2442390005464108 | Subject:Engineering |
Abstract/Summary: | |
This thesis proposes a three-level DC-to-DC converter with capacitive output filter and its extension to single-phase, single-stage, three-level AC-to-DC converter with capacitive output filter. The AC-to-DC converter integrates a three-level boost converter operating in discontinuous conduction mode (DCM) and a three-level half-bridge DC-to-DC converter with capacitive output filter.; The steady-state operation of the DC-to-DC converter and AC-to-DC converter with capacitive output filter are studied with phase-shifted gating scheme. The three-level topology reduces the voltage rating of the switches to half of the input voltage. Soft-switching is achieved for switches at different load and input voltage conditions. Boost section of the AC-to-DC converter achieves automatic power factor correction (PFC). At reduced load and higher input voltage conditions, the line current Total Harmonic Distortion (THD) increases with phase-shifted gating scheme. The THD has been reduced by using a complementary PWM gating control in the AC-to-DC converter. |
Keywords/Search Tags: | Converter, Three-level, Gating scheme, Input voltage conditions |
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