Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Implementation of Non-time-varying Duty Ratio Transfer Function for Improvement of Control Characteristics Bi-directional Charger
Authors Jung-Goo Hwang ; Sun-Pil Kim ; Sang-Taek Han ; Ki-Seon Kim ; Young-Bae Choo ; Sung-Jun Park
DOI 10.6113/TKPE/2014.19.2.124
Page pp.124-132
ISSN 1229-2214
Keywords battery charger; bi-directional DC/DC converter; controller; compensator
Abstract In this paper, we implement a non-time-varying transfer function of the duty ratio to improve the control characteristics in a control system that Input voltage and the output voltage is varied, DC / DC converters for bi-directional charging. When control is performed with using controller gain of conventional design, characteristics of the control is varied to fluctuations of the input voltage. The proposed method is the equivalently removing method for duty ratio in entire control block, by voltage controller gain is changed for inverse of the duty ratio. The proposed non-time-varying duty ratio transfer function is applied to DC / DC converter for bi-directional charging. In this paper, feasibility and superiority is verified through PSIM simulations and experiments.