Developing a new topology for the DC-DC converter used in fuel cell-electric double layer capacitor hybrid power source system for mobile devices

The polymer electrolyte membrane fuel cell (PEMFC) has a potential to be an alternative power source for smartphones and other mobile electronic applications. However, PEMFCs cannot quickly response against fast load change of electronic devices. To resolve this issue, we have proposed a hybrid power source system, in which super capacitors and a PEMFC are combined using DC-DC converter. The converter is controlled by a micro-controller so that the power flows are managed. However, in low load condition, voltage became slightly higher than the target value and the super capacitor was not able to be charged. To challenge these drawbacks, in this study, we develop a new type topology for the converter, which use three switching devices, and control method. We also demonstrated the behavior of the system. The results showed that the drawbacks mentioned above is resolved and power conversion efficiency of the converter is improved under various load profile.