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http://dx.doi.org/10.5370/JEET.2014.9.6.2224

Performance Improvement of Isolated High Voltage Full Bridge Converter Using Voltage Doubler  

Lee, Hee-Jun (school of Information and Communication Engineering, Sungkyunkawn Univ.)
Shin, Soo-Cheol (VC Power Electronics R&D Part, VC R&D Laboratory, LG Electronics)
Hong, Seok-Jin (School of Information and Communication Engineering, Sungkyunkawn Univ.)
Hyun, Seung-Wook (School of Information and Communication Engineering, Sungkyunkawn Univ.)
Lee, Jung-Hyo (VC Power Electronics R&D Part, VC R&D Laboratory, LG Electronics)
Won, Chung-Yuen (School of Information and Communication Engineering, Sungkyunkawn Univ.)
Publication Information
Journal of Electrical Engineering and Technology / v.9, no.6, 2014 , pp. 2224-2236 More about this Journal
Abstract
The performance of an isolated high voltage full bridge converter is improved using a voltage doubler. In a conventional high voltage full bridge converter, the diode of the transformer secondary voltage undergoes a voltage spike due to the leakage inductance of the transformer and the resonance occurring with the parasitic capacitance of the diode. In addition, in the phase shift control, conduction loss largely increases from the freewheeling mode because of the circulating current. The efficiency of the converter is thus reduced. However, in the proposed converter, the high voltage dual converter consists of a voltage doubler because the circulating current of the converter is reduced to increase efficiency. On the other hand, in the proposed converter, an input current is distributed when using parallel input / serial output and the output voltage can be doubled. However, the voltages in the 2 serial DC links might be unbalanced due to line impedance, passive and active components impedance, and sensor error. Considering these problems, DC injection is performed due to the complementary operations of half bridge inverters as well as the disadvantage of the unbalance in the DC link. Therefore, the serial output of the converter needs to control the balance of the algorithm. In this paper, the performance of the conventional converter is improved and a balance control algorithm is proposed for the proposed converter. Also, the system of the 1.5[kW] PCS is verified through an experiment examining the operation and stability.
Keywords
Fuel cell; PCS(Power Conditioning System); Dual converter; Full bridge converter; DC/DC converter; SOB(Serial Output Voltage Balance) control;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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