Common grounded wide voltage‐gain range DC–DC converter for fuel cell vehicles

Abstract

In order to meet the requirements of the fuel cell stack power interface converter applied in the fuel cell vehicles, a common ground wide voltage-gain range DC-DC converter is proposed. On the input voltage side, an interleaved structure is adopted in this converter to reduce the input current ripple. On the output voltage side, two series capacitors are combined with a diode-capacitor structure to improve the voltage gain and reduce the voltage stress of power semiconductors and capacitors. As a result, the efficiency and reliability of the proposed converter can be improved. The operating principle, steady-state characteristic, parameter design, efficiency calculation, and comparison with other converters are analysed. A 1.6 kW prototype of the proposed converter with the 400 V output voltage has been developed to validate the analytical results. Theoretical analysis and experimental results show that the proposed converter can meet the requirements of a fuel cell stack power interface converter and is suitable for use as a fuel cell stack power interface converter applied in fuel cell vehicles.

Quadratic buck–boost converter with reduced input current ripple and wide conversion range

“…From Fig. 1d, by applying the Kirchhoff current law in the lower node, it can be observed that the input current i d is equal to the inductor L 1 current i L 1 minus the inductor L 2 current i L 2 , also indicated in (1). An interesting behaviour can be observed in Fig.…”

“…It is indisputable that power electronics converters are essential for processing the generated power from renewable sources. Among the DC renewable power sources, proton exchange membrane fuel cell (PEMFC) systems [1][2][3] and photovoltaic (PV) panels [4][5][6] are the most remarkable. In the design of an energy management system, there are two main requirements, besides traditional needs of the power electronics converters; (i) the wide voltage-range of operation and (ii) the requirements on the input current harmonic distortion.…”

“…Therefore, the discussed example, in which the maximum gain is 7.7 cannot be achieved with the traditional boost converter. Alternatively, a great number of topologies has been proposed [1,[18][19][20][21][22]; the key idea consists of incorporating an extra gain in cascade connection at the output of the conventional boost converter. Typically, the multiplier cells, constituted by pairs of diode-capacitor [18], have been employed, however as the number of cells increases so do the power losses [18].…”

Equivalent input disturbance observer‐based ripple‐free deadbeat control for voltage regulation of a DC–DC buck converter

“…Based on the designed T(z), the deadbeat controller D z can be recalculated. The order of z in T z is decided by causality of D z , which is calculated as follows: (1) .…”

“…DC-DC buck converter is a mature technology and it is utilised in a vast array of applications. Recently, the introduction of DC microgrids will promote broader applications of DC-DC converters in future electric energy systems [1][2][3]. However, as converter dynamics are complex, designing a high-performance control is a rather challenging task due to the electrical magnetic interference, input voltage variation, system model parameter perturbation, and load resistance change [4,5].…”