Hybrid DC-DC converter applicable to photovoltaic power generation system

Abstract

The invention discloses a hybrid DC-DC converter applicable to a photovoltaic power generation system. The hybrid DC-DC converter 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 and one end of a capacitor C2, the other end of the inductor L1 is connected with a positive electrode of a freewheeling diode D2and a positive electrode of a freewheeling diode D4, the other end of the capacitor C2 is connected with a negative electrode of the freewheeling diode D4 and a positive electrode of a freewheeling diode D1, a negative electrode of the freewheeling diode D1 is connected with one end of the capacitor C1, a positive electrode of a freewheeling diode D5 and one end of an inductor L2, the other end ofthe inductor L2 is connected with one end of an output capacitor C4, a negative electrode of the freewheeling diode D2 and a drain of a switch tube S, the other end of the capacitor C4 is connected with a negative electrode of the freewheeling diode D5 and a positive electrode of an output rectification diode D0, a negative electrode of the output rectification diode D0 is connected with one endof an output capacitor C0 and one end of a load resistor R, and the other end of the output capacitor C0, the other end of the load resistor R, a source of the switch tube S and the other end of the capacitor C1 are connected with a negative electrode of the input power supply Vin. By the hybrid DC-DC converter, the efficiency and the gain ratio can be remarkably improved.

Description

technical field [0001] The invention relates to a boost converter, in particular to a hybrid DC-DC converter suitable for a photovoltaic power generation 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 paramete...

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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