Cascaded DC/DC converter for asymmetric boost unit of photovoltaic system

Abstract

The invention discloses a cascaded DC / DC converter for an asymmetric boost unit of a photovoltaic system, which comprises an input power supply Vin, wherein a positive electrode of the input power supply Vin is connected with one end of an inductor L1, the other end of the inductor L1 is connected with an anode of a free-wheeling diode D1 and an anode of a free-wheeling diode D2, a cathode of thefree-wheeling diode D1 is connected with one end of an inductor L2, one end of a capacitor C1 and one end of a capacitor C2, the other end of the inductor L2 is connected with an anode of a free-wheeling diode D4, one end of a capacitor C3, a cathode of the free-wheeling diode D2 and a drain electrode of a switching tube S, the other end of the capacitor C2 is connected with a cathode of the free-wheeling diode D4 and an anode of a free-wheeling diode D3, the other end of the capacitor C3 is connected with a cathode of the free-wheeling diode D3 and an anode of an output rectifying diode Do,a cathode of the output rectifying diode Do is connected with one end of an output capacitor Co and one end of a load resistor R, and the other end of the output capacitor Co, the other end of the load resistor R, a source electrode of the switching tube S and the other end of the capacitor C1 are connected with a negative electrode of the input power supply Vin. The cascaded DC / DC converter can improve the efficiency and the gain ratio.

Description

technical field [0001] The invention relates to a boost converter, in particular to a cascaded DC / DC converter of an asymmetric boost unit for a photovoltaic system. Background technique [0002] With the depletion of traditional fossil energy and the deteriorating environment of human beings, the development of clean renewable energy is imminent. All countries in the world are committed to the research and development of new energy applications, of which solar energy and wind energy have been obtained a wider range of applications. However, for these systems, how to operate grid-connected and meet the high voltage requirements in the grid is still the most important issue. At present, a large number of boost converters have been developed to meet these applications. Among different converters, the traditional BOOST converter can theoretically increase the voltage gain by increasing the duty cycle. However, in practical applications, due to the limitation of parasitic para...

AI Technical Summary

Problems solved by technology

However, in practical applications, due to the limitation of parasitic parameters, very high voltage gain cannot be achieved

If a cascaded topology is used, the problem of low efficiency caused by the increase in the number of devices will be highlighted again.

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