Wide-voltage-input efficient direct-current power converter for aerostat

Abstract

The invention discloses a wide-voltage-input efficient direct-current power converter for an aerostat. The wide-voltage-input efficient direct-current power converter comprises a SuperBuck circuit, a push-pull circuit, a closed-loop control circuit and a diode used for achieving the series connection of the output end of the SuperBuck circuit and the output end of the push-pull circuit, wherein the SuperBuck circuit is composed of an inductor, a capacitor, a diode and a switch tube, and the push-pull circuit is composed of a switch tube, a boosting transformer, a rectifier diode and a filter capacitor. The wide-voltage-input efficient direct-current power converter for the aerostat has the advantages that the polarity of input voltages and the polarity of output voltages are identical, a main circuit device is simple, input currents and output currents are consecutive, input and output are common-grounded, current pulses caused to a power supply bus and a storage battery are small, and smooth switching of voltage boosting and voltage reduction can be achieved.

Description

technical field [0001] The present invention relates to a power converter, more particularly, refers to a wide-voltage input high-efficiency DC power converter suitable for stratospheric aerostats. Background technique [0002] The stratospheric aerostat is a comprehensive information platform located in the stratosphere. It adopts the design concept of aviation aircraft and has a large airbag filled with light gas (such as helium). It can rely on air buoyancy to balance the gravity of the aircraft, generally relying on solar energy It provides power and relies on propeller thrust to overcome resistance. The working altitude is about 20km. It can hover at a fixed point for a long time, and can fly horizontally at low speed. , has become a research hotspot at home and abroad. [0003] see figure 1 As shown in the figure, the stratospheric aerostat needs to have an energy circulation system consisting of a high-efficiency solar array (SA), a high specific energy battery pack...

AI Technical Summary

Problems solved by technology

Among them, the buck-boost input and output current is intermittent, the harmonics are large, the electromagnetic compatibility is poor, and the voltage stress of the switching element is large; the input and output inductance in the boost-buck conversion circuit can improve electromagnetic compatibility, but the intermediate voltage is the input and output voltage. The sum of the voltages makes the voltage stress of the switching element large, the switching loss is large, and the efficiency is low, and the current stress of the switching element is twice as large under the same power condition, and the input and output polarities are opposite

[0006] Therefore, the existing DC power converter topology cannot meet the requirements of the above-mentioned aerostat PCU system

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