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A Novel Digital Soft-Start Circuit for DC-DC Converter
F. Kurokawa,J. Takano,T. Takahashi,K. Bansho,T. Tanaka,K. Hirose 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper proposes a novel quick soft-start method for the digital control dc-dc converter. To implement the energy management for energy saving, the power supply that can be operated in start-up and be shuttled down quickly and continually is necessary. It is the power supply added to the soft-start capability. It is important for the soft-start operation to detect the load resistor. In the conventional analog control method, the fixed large time constant of the soft?start circuit must be set corresponding to the worth condition. In the proposed digital control, the optimal time constant of the soft-start circuit can be decided with load resistor with the control processor. Therefore, it doesn’t need to set the large value for the time constant. As a result, the convergence time of output voltage is suppressed. From simulation results, it is confirmed that the digital control method has superior soft-start characteristics compared to the analog one and the convergence time of output voltage is approximately 94% smaller than the analog one.
Performance Characteristics of Single-Stage AC-DC Full-Bridge Converter
S. Hattori,F. Kurokawa,K. Ueno 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
A single-stage ac-dc converter consisting of full-bridge converter is proposed for battery charger applications. Desired feature for the battery charger such as a low cost, small volume, high efficiency and high reliability are achieved by means of the proposed solution. The proposed approach is superior to conventional two-stage ac-dc converter widely used for EV charger applications. The two-stage ac-dc converter is apt to be costly and large. However a single-stage ac-dc converter is suitable to a low cost, small volume due to a reduced number of components. In this paper, a digital control single-stage ac-dc converter consisting of full-bridge converter and series connection of secondary transformer is presented in order to achieve downsizing, high efficiency, high power factor and high reliability for a battery charger. The feasibility and practical value of the proposed approach are verified by the experimental results from a 0.8 / 1.6kW product prototype.
Dynamic PID Gain Changing Control for DC-DC Converter
Y. Furukawa,D. Mitsutake,T. Shirakawa,H. Maruta,F. Kurokawa 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper presents a digital control method where changes PID parameter setting dynamically to improve transient characteristics of dc-dc converters. In the conventional PID control, those control parameters are selected as suitable values to satisfy stable characteristics both in transient state and steady state and keep the stability of system. Therefore, the value of control parameter tends to be a small one. In this paper, we propose the method where the PID parameter setting is changed to the suitable one in the transient state, where the value of control parameter is designed just to improve the transient response and takes larger one compared to the conventional PID control method. Using the proposed method, the transient response can be improved without the loss of stability of dc-dc converter.