Hyun-seok Park

A development of the detection unit of Fuel cell impedance

Researches to control water content of Polymer Electrolyte Membrane(PEM) are actively performed for increasing performance & durability of Fuel cell. This Research to control water content focused on measurement of PEM impedance. In this paper, The measurement system of PEM Impedance based on AC impedance method is proposed. Bi-directional DC/DC converter is designed to measurement of PEM impedance. The validity of proposed measurement system of PEM impedance is verified by experiment results in the Fuel cell Stack and FCEV..

Design and control of power conversion system for ISG

In this paper, design and control method of power conversion system for the 48[V] ISG system is proposed. Proposed ISG system is consist of bi-directional DC/DC converter, bi-directional DC/AC inverter, ISG motor, and 48 [V] and 12[V] batteries. There are three modes of integrated operation including initial start-up and 48[V] and 12[V] battery. Simulation and experimental results are given to verify the reliability of proposed ISG system.

Control and design of the bi-directional DC/DC converter for fuel-cell stack diagnostic in FCEV

In this paper, control and design method of the fuel-cell (FC) stack diagnostic bi-directional converter are proposed. FC stack diagnostic converter is applied the bi-directional DC/DC converter for controlling the AC current. The AC current control is performed by applying the d-q transform for accurate current control. As a result, it can diagnose the status of the FC stack by supplying the AC current to the FC stack and monitoring the voltage and current of the FC stack. It is analyzed mathematically to design the bi-directional dc/de converter and considered the output ripple voltage and the inductor ripple current. The validity of proposed control method of the FC stack diagnostic bi-directional converter is verified by PSIM simulation results and proposed the 1.5kW FC stack diagnostic bi-directional converter.