| Summary: | 碩士 === 國立成功大學 === 電機工程研究所 === 82 === Traditionally,the AC-DC converter used a passive rectifier, add
large capacitor,but it will produce an amount of input current
harmonics,These large input current harmonics will make not
only the power factor but also the power quality is poor,so in
this thesis will use a average current mode control to make the
unity power factor,and use a feedforward method make the output
voltage has a better dynamic response when the input voltage
various.For safty ,in the proposed converter a isolated high
frequency transformer is used.In this thesis ,the proposed
converter used a boost type push- pull converter to achieve our
goal.For increasing the efficiency a novel soft-switching
technologies is used to reduce the switching losses.Finally,a
single-phase 1KVA push-pull boost converter is setup to verify
the predicted and analyzed result. The experimental result show
that the proposed push-pull converter has unity power factor,
high power conversion efficiency,small size,light weight,low
THD,low EMI and fast transient response.
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