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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.