The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Hybrid Current Mode Controller with Fast Response Characteristics for DC/DC Converter

빠른 응답특성을 갖는 DC/DC 컨버터 하이브리드 전류 모드 제어기

  • Oh, Seung-Min (Dept. of Control & Instrumentation Engineering, Korea Nat'l Univ. of Transportation) ;
  • Baek, Seung-Woo (Dept. of Control & Instrumentation Engineering, Korea Nat'l Univ. of Transportation) ;
  • Kim, Hag-Wone (Dept. of Control & Instrumentation Eng., Korea Nat'l Univ of Transportation) ;
  • Cho, Kwan-Yuhl (Dept. of Control & Instrumentation Engineering, Korea Nat'l Univ. of Transportation)
  • Received : 2018.11.11
  • Accepted : 2018.12.05
  • Published : 2019.04.20
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Abstract

A wide-bandwidth current controller is required for fast charging/discharging of super capacitor applications. Peak current mode is generally used to accomplish fast charging/discharging because this mode has fast response characteristics. However, the peak current mode control must have a slope compensation function to restrain sub-harmonics oscillation. The slope must be changed accordingly if the controlled output voltage is varied. However, changing the slope for every changed output voltage is not easy. The other solution, selecting the slope as the maximum value, causes a slow response problem to occur. Therefore, we propose a hybrid mode controller that uses a peak current and a newly specified valley current. Through the proposed hybrid mode control, the sub-harmonic oscillation does not occur when the duty is larger than 0.5 because of the fast response.

Keywords

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Fig. 1. Previous method for preventing sub-harmonic oscillation.

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Fig. 2. The process of duty formation at different slopes.

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Fig. 3. Inductor current in steady state.

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Fig. 4. Block diagram of the proposed hybrid controller.

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Fig. 5. A simulated waveform representing the response time of the output voltage at different controller.

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Fig. 6. Inductor current simulation waveform when output voltage drop.

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Fig. 7. Inductor current simulation waveform when the output voltage is raised.

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Fig. 8. Experimental waveforms that show the response time of the output voltage on different controllers. (50V/div, 500msec/div)

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Fig. 9. Experimental waveform of inductor current when output voltage drops. (10V/div, 1A/div, 50msec/div)

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Fig. 10. Experimental waveform of inductor current when output voltage rises. (10V/div, 1A/div, 50msec/div)

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Fig. 11. Experimental waveform of inductor current before output voltage changes. (10V/div, 1A/div, 25usec/div)

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Fig. 12. Experimental waveform of inductor current after output voltage change. (10V/div, 1A/div, 25usec/div)

TABLE I SYSTEM PARAMETERS

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