Balloon-borne power converter for tethered balloon

Abstract

The invention discloses a balloon-borne power converter for a tethered balloon. The balloon-borne power converter is put on an air platform of a tethered balloon system and is used for being connected with a low-voltage mooring line, a high-voltage mooring line and an electric unit in a current tethered balloon system; and the balloon-borne power converter comprises a DSP processor, a balloon-borne high-voltage step-down circuit, a rectifier and filter circuit, a Buck circuit, an uninterrupted switching and charging circuit, three drive circuits connected with the DSP processor, and a protection circuit. According to the designed balloon-borne power converter, automatic switching of high-voltage power supply, low-voltage power supply and emergency lithium battery power supply can be achieved, uninterruptible power supply during high-voltage power supply, low-voltage power supply and emergency lithium battery power supply can be achieved, and meanwhile, the electric unit can be provided with electricity and an emergency lithium battery can be charged.

Description

technical field [0001] The invention relates to a power supply device, more particularly, to a novel ball-borne power converter for tethered balloons. Background technique [0002] The tethered balloon system is divided into ground and air parts, such as figure 1 shown. The tethered balloon is a kind of floating aircraft that does not have its own power and relies on buoyancy to lift into the air. It stays at a predetermined position in the air through a tethered cable. With the advantages of long space time, heavy payload, convenient deployment, and low cost, it has been widely used in early warning detection, communication relay, disaster prevention and mitigation, and public security in recent years. [0003] Tethered balloon air platform system long-term power supply (such as Figure 1A Shown) is mainly realized by ground power transmission, that is, the ground power supply is raised to a high voltage of about 2,000 volts, and the high voltage is transmitted to the te...

AI Technical Summary

Problems solved by technology

According to the available information, currently the mooring of tethered balloons adopts the ground high-voltage power supply method. The power supply is transmitted through a long thin cable. Generally, medium-sized tethered balls are several kilometers away. The ground high-voltage power supply method makes the loss on the thin cable particularly large. At the same time, since the thin cable not only transmits power, but also includes optical cables, try not to go when power is transmitted when mooring on the ground. High-voltage mooring cables affect the life of thin cables; and there are safety hazards such as high-voltage discharge of about 2,000 volts in rainy days. Therefore, this method is likely to cause power conversion losses, affect the life of the mooring cable, and increase safety hazards, etc.

[0005] At the same time, when the power supply fails, the tethered balloon switches to the emergency lithium battery for power supply. At present, the existing switching method has a time interval and a power-off time. However, many loads are prone to data loss and failure when the power is off, and uninterrupted power supply is urgently needed.

The existing uninterrupted power supply generally adopts the following two methods, one is the method of adding a large capacitor at the end of the relay, which is simple and easy to implement, but has the following disadvantages in actual work: when the load voltage fluctuates greatly, when the backup power supply voltage is low, Switching between the main and backup power sources is likely to cause a power failure; when the power supply is turned on, the capacitor is easy to charge quickly, and it is easy to damage the circuit in front of the capacitor, which poses a safety hazard

The second is to use a diode to switch between the main power supply and the emergency battery. The voltage drop, and there is a large amount of power consumption on the diode, resulting in a waste of energy

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