Journal of Guangxi Normal University(Natural Science Edition) ›› 2022, Vol. 40 ›› Issue (4): 68-78..doi: 10.16088/j.issn.1001-6600.2021072202

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Research and Analysis of an Improved Quadratic Buck-Boost Converter

ZHU Gaozhong1,2 , LIU Shulin1*, WANG Cheng1, LI Xueting1   

  1. 1. School of Electircal and Control Engineering, Xi’an University of Science and Technology, Xi’an Shaanxi 710054, China;
    2. School of Physics and Electircal Engineering, Weinan Normal University, Weinan Shaanxi 714099, China
  • Published:2022-08-05

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Abstract: Aiming at the disadvantages of low voltage gain of traditional converters, high voltage stress of switching devices, and large output voltage ripple.An improved quadratic Buck-Boost converter is proposed by adding a switched capacitor unit and an LC filter in the rear stage of the traditional quadratic Buck-Boost converter. Firstly, the working principle of the new converter in continuous conduction mode (CCM) is analyzed. Then, the new converter is compared with other quadratic converters from different anglesand the results show that the newconverter has good performance characteristics.Finally, a comparison is carried out between theexperiment of the new converter and the experiment of the original converter, and the results show and that the output voltage gain of the new converter is (1+D)/D timesof that of the original one. In the step-up mode with the output voltage of 37.4 V, the output voltage ripple before improvement is approximately 3 times of that after improvement. In the step-down mode with the output voltage of 9 V, the output voltage ripple before improvement is approximately 12 times of that after improvement. At the same time, the voltage stress of the switching device is significantly reduced under the same output voltage. Both of the expermental and theoretical analysis verify that the improved quadratic Buck-Boost converter is feasible.

Key words: continuous conduction mode, voltage stress, quadratic Buck-Boost converter, voltage multiplication unit, voltage gain

CLC Number: 

  • TM46
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