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Dynamic Characteristics of DC-DC Converters Using Digital Filters
Kurokawa, Fujio,Okamatsu, Masashi,Ishibashi, Taku,Nishida, Yasuyuki The Korean Institute of Power Electronics 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.3
This paper presents the dynamic characteristics of buck and buck-boost dc-dc converters with digital filters. At first, the PID, the minimum phase FIR filter and the IIR filter controls are discussed in the buck dc-dc converter. Comparisons of the dynamic characteristics between the buck and buck-boost converters are then discussed. As a result, it is clarified that the superior dynamic characteristics are realized in the IIR filter method. In the buck converter, the undershoot is less than 2% and the transient time is less than 0.4ms. On the other hand, in the buck-boost converter, the undershoot is about 3%. However, the transient time is approximately over 4ms because the output capacitance is too large to suppress the output voltage ripple in this type of converter.
A New High Performance Auto-Tuning Digital Control Circuit for Buck-Boost Converter
Fujio Kurokawa,Taku Ishibashi,Yoshihiko Komichi,Tadatoshi Babasaki 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
The purpose of this paper is to present the dynamic characteristics of the new high performance autotuning digital control circuit for buck-boost converter when the step change of the load resistance R from 20 Ω to 10Ω. The buck-boost dc-dc converter is used with wide input voltage changing. At the same time, the suitable proportional gain and bias value are changing against the input voltage and the load resistance of the converter. So, we took two methods that changing proportional gain automatically and changing bias value against the input voltage, the load resistance and the loss of the converter. As a result, using this proposed method it is revealed that not only the dynamic characteristic but also regulation characteristic can be improved and it is effective for wide range input voltage. Especially, the steady-state error is improved from 470㎷ to 50㎷ when the input voltage is 5V, 700㎷ to 40㎷ when the input voltage is 15V, respectively.
Static and Dynamic Characteristics of DC-DC Converter Using a Digital Filter
Fujio Kurokawa,Masashi Okamatsu 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
This paper presents the regulation and dynamic characteristics of the dc-dc converter with the digital PID control, the minimum phase FIR filter or the IIR filter. Further, we discuss the comparison of these performance characteristics. As a result, it is clarified that the variable rate of the regulation is within 1.3%, the undershoot is less than 200㎷ and the transient time is less than 0.4㎳ in the IIR filter method.
Dynamic Characteristics of DC-DC Converters Using Digital Filters
Fujio Kurokawa,Masashi Okamatsu,Taku Ishibashi,Yasuyuki Nishida 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.3
This paper presents the dynamic characteristics of buck and buck-boost dc-dc converters with digital filters. At first, the PID, the minimum phase FIR filter and the IIR filter controls are discussed in the buck dc-dc converter. Comparisons of the dynamic characteristics between the buck and buck-boost converters are then discussed. As a result, it is clarified that the superior dynamic characteristics are realized in the IIR filter method. In the buck converter, the undershoot is less than 2% and the transient time is less than 0.4ms. On the other hand, in the buck-boost converter, the undershoot is about 3%. However, the transient time is approximately over 4ms because the output capacitance is too large to suppress the output voltage ripple in this type of converter.
A Novel Predictive Digital Controlled Sensorless PFC Converter under the Boundary Conduction Mode
Wang, Jizhe,Maruta, Hidenori,Matsunaga, Motoshi,Kurokawa, Fujio The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.1
This paper presents a novel predictive digital control method for boundary conduction mode PFC converters without the need for detecting the inductor current. In the proposed method, the inductor current is predicted by analytical equations instead of being detected by a sensing-resistor. The predicted zero-crossing point of the inductor current is determined by the values of the input voltage, output voltage and predicted inductor current. Importantly, the prediction of zero-crossing point is achieved in just a single switching cycle. Therefore, the errors in predictive calculation caused by parameter variations can be compensated. The prediction of the zero-crossing point with the proposed method has been shown to have good accuracy. The proposed method also shows high stability towards variations in both the inductance and output power. Experimental results demonstrate the effectiveness of the proposed predictive digital control method for PFC converters.
A Novel Predictive Digital Controlled Sensorless PFC Converter under the Boundary Conduction Mode
Jizhe Wang,Hidenori Maruta,Motoshi Matsunaga,Fujio Kurokawa 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.1
This paper presents a novel predictive digital control method for boundary conduction mode PFC converters without the need for detecting the inductor current. In the proposed method, the inductor current is predicted by analytical equations instead of being detected by a sensing-resistor. The predicted zero-crossing point of the inductor current is determined by the values of the input voltage, output voltage and predicted inductor current. Importantly, the prediction of zero-crossing point is achieved in just a single switching cycle. Therefore, the errors in predictive calculation caused by parameter variations can be compensated. The prediction of the zero-crossing point with the proposed method has been shown to have good accuracy. The proposed method also shows high stability towards variations in both the inductance and output power. Experimental results demonstrate the effectiveness of the proposed predictive digital control method for PFC converters.
Mutsuyoshi Asano,Hirofumi Matsuo,Haruya Mae,Fujio Kurokawa,Masahiro Sasaki 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
This paper deals with the analysis of the output characteristics of the new digitally controlled dc-dc converter with auxiliary switches, which are used to prevent the extremely lowering of the switching frequency caused by the decrease of the load current and/or the increase of the input voltage. This dc-dc converter with auxiliary switches has two major operation modes; that is, the frequency control and on-time control modes. Taking account of the forward voltage drops and loss resistances of the main switches, auxiliary switches and diodes, and the winding series resistances of the transformer, the detailed circuit operation and the output characteristics are analysed. As a result of analysis, it is clarified that the superior regulation characteristics of the output voltage is obtained, and that the power efficiency of the digitally controlled dc-dc converter with auxiliary switches is improved in the relatively light load region, compared with that of the conventional one with analog control circuit.