Title page for etd-0723115-214902


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URN etd-0723115-214902
Author Wei-lun Tsai
Author's Email Address No Public.
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Department Electrical Engineering
Year 2015
Semester 1
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title A Novel Bi-Directional Full-Wave Rectifier with Higher Step-Up and Step-Down Voltage Ratio
Date of Defense 2015-08-11
Page Count 112
Keyword
  • Time Division Multiplex
  • Four Times Voltage Multiplier Rectifier
  • Renewable Energy Generation System
  • Higher Step-Up and Step-Down Voltage Ratio
  • Voltage Stress
  • Abstract This thesis proposes a novel bi-directional full-wave rectifier with higher step-up and step-down voltage ratio which can be used in renewable energy generation systems. The low-voltage side of this circuit is full-bridge topology, combined with transformer, and the high-voltage side is composed of two full-wave rectifier circuits to construct a four times voltage multiplier rectifier. In the boost mode, the power switches of low-voltage side are driving by phase-shift control to reduce the stresses on the power switches. Meanwhile, the Time Division Multiplex (TDM) control strategy is used to transfer energy from the output rectifier diodes to the output capacitors at different time intervals. TDM control strategy can reduce voltage stress of the output capacitors and rectifier diodes. The voltages of output capacitors can almost achieve equalizing voltage. The four times output voltage can then be realized due to the superposition of the output capacitor voltages. In buck mode, the different capacitors based on TDM control strategy can release energy to load in different time intervals. All capacitor voltages in the buck mode are also almost same. A novel bi-directional full-bridge full-wave rectifier with higher step-up and step-down voltage ratio is implemented in this thesis. The specifications for the boost and buck modes are 24V DC input, 200V DC output, and rated power 100W and 200V DC input, 24V DC output, and rated power 100W, respectively. Experimental results show that the bi-directional functionality of the proposed circuit can be achieved. Besides, the conversion efficiency for both boost and buck modes is above 86%. Experimental and simulated results also indicate that the voltage stresses of output capacitors and rectifier diodes in the proposed four times voltage multiplier rectifier is less than the conventional half-wave or full-wave rectifiers. Therefore, the proposed bi-directional circuit has great potential to be used in the converters of renewable energy generation systems requiring higher step-up and step-down voltage ratio.
    Advisory Committee
  • Shun-Jhong Wang - chair
  • Yi-Hua Liu - co-chair
  • Shang-Wun Luan - co-chair
  • Jen-Hao Teng - advisor
  • Files
  • etd-0723115-214902.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2015-08-23

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