부산대학교 도서관

This paper proposes a new fourth-order dc-dc boost converter, developed as an improved version of the traditional Zeta converter, the main advantages of the proposed quasi-zeta converter are: (i) it can be constructed with a commercial half-bridge transistors package, in contrast with the traditional Zeta converter in which the diode and transistor are not connected to the same node, this characteristic makes easier constructing a high power converter with the proposed configuration, (iii) inductors drain a current smaller than the input current, which reduces the size of inductors, finally, (iii) both input and output current are non-pulsating, which reduces the possibility of having EMI problems. Converter design expressions are formulated with a time-domain analysis. The large signal non-linear model is provided along with a linear small-signal approximation. A comparative evaluation shows the proposed converter requires 55% to the energy stored in inductors to comply with a required input current ripple in comparison with the super-boost converter. Experimental results are provided to verify the principle of the proposed converter.