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A Novel high step-up Dual switches converter
with Coupled Inductor and voltage multiplier cell
for a renewable energy system
Abstract:
A novel high step-up converter, which is suitable for renewable energy
system, is proposed in this paper. The proposed converter is composed of
the dual switches structure, three-winding coupled inductor and two voltage
multiplier cells in order to achieve the high step-up voltage gain. The dual
switches structure is beneficial to reduce the voltage stress and current
stress of the switch. In addition, two multiplier capacitors are respectively
charged during the switch-on period and switch-off period, which increases
the voltage conversion gain. Meanwhile, the energy stored in the leakage
inductor is recycled with the use of clamped capacitors. Thus, two main
power switches with low on-resistance and low current stress are available.
As the leakage inductor, diode reverse-recovery problem is also alleviated.
Therefore, the efficiency is improved. This paper illustrates the operation
principle of the proposed converter, discusses the effect of the leakage
inductor; analyzes the influence of parasitic parameters on the voltage gain
and efficiency, the voltage stresses and current stresses of power devices
are shown; a comparison between the performance of the proposed
converter and the previous high step-up converters is performed. Finally,
the prototype circuit with input voltage 20V, output voltage 200V and rated
power 200W is operated to verify its performance.
Existing system:
Owing to the energy crisis and environment pollution, the renewable energy
is cherished and employed widely. The renewable energy sources, such as
the fuel cells and the photovoltaic cells, generate the low voltage output.
Thus, the high step-up dc/dc converters have been widely used in such
renewable energy systems. The system can convert the low voltage from
the fuel cells source and photovoltaic cells source into the high voltage via
the high step-up converter, and then, the renewable energy is transformed
into the load and utility through the inverter.
Proposed system:
The proposed dual switches high step-up converter is the conventional dual
switches boost converter integrated with the voltage multiplier cells. The
voltage multiplier cells are composed of switches capacitors and thirdwinding coupled inductor.
Block diagram:
Circuit diagram:
Advantages:
 Due to the passive lossless clamp performance, leakage
energy is recycled to the output terminal at last and the large
voltage spike is avoided.
 Due to the three charging loop during the switching-on period,
the current stresses of the switches are reduced. Therefore, the
low voltage stress and current stress MOSFET can be
available, and the efficiency is improved.
Reference:
[1] Kuo-Ching Tseng, Chi-Chih Huang, and Wei-YuanShih,’A High Step-Up
Converter With a Voltage Multiplier Module for a Photovoltaic System’,IEEE
Trans. Power Electron. , vol. 28, no.6, pp. 3047–3057, June. 2013.
[2] J. T. Bialasiewicz, “Renewable energy systems with photovoltaic power
generators: Operation and modeling,”IEEE Trans. Ind. Electron. , vol. 55,
no. 7, pp. 2752–2758, Jul. 2008.
[3] Y. Xiong, X. Cheng, Z. J. Shen, C. Mi, H. Wu, and V. K. Garg, “Prognostic and warning system for power-electronic modules in electric, hybrid
electric, and fuel-cell vehicles,” IEEE Trans. Ind. Electron. , vol. 55, no. 6,
pp. 2268–2276, Jun. 2008.