25-08-2012, 10:57 AM
Coupled-Inductor and Voltage-Doubler circuits for High Step-Up Dc-Dc converter
conference.pptx (Size: 1.27 MB / Downloads: 36)
Introduction
A DC-DC converter converts directly from dc to dc and is simply known as a DC converter.
Dc converters are widely used for traction motor control in electric automobiles, trolley cars, marine hoists and mine haulers.
They provide smooth acceleration control, high efficiency and fast dynamic response.
A boost converter has several advantages such as simple structure, continuous input current.
However, it is very difficult to satisfy both high voltage conversion ratio and high efficiency at once. This is primarily due to the parasitic resistances, which cause serious degradation in the step-up ratio and efficiency as the operating duty increases.
BOOST CONVERTER
The coupled-inductor and voltage-doubler techniques are integrated in the proposed converter to achieve high step-up voltage gain.
The features of this converter are as follows:
1) The leakage inductor energy of the coupled inductor can be recycled.
2) the voltage stresses on the switches are half the level of the output voltage.
3) the voltage gain achieved by the proposed converter is double that of the conventional high step-up converter
Conclusion
The proposed circuit has the following various advantages compared to the conventional booster converters: low voltage stress, higher boost rate, higher efficiency, and several modified circuits for other applications. Therefore, the proposed converter can be applied to various high boost applications, such as a battery back-up system, fuel cells, military applications, etc.