Redundant MPPT circuit structure-based micro-nano satellite power supply system

Abstract

The invention relates to a redundant MPPT circuit structure-based micro-nano satellite power supply system, which comprises a control assembly, an electric storage assembly, switch assemblies and power generating assemblies, wherein every two power generating assemblies are connected with each other in series to form a power generating assembly group; a positive terminal of each power generating assembly group is connected with one switch assembly; a negative terminal of each power generating assembly group is connected with the negative terminal of the electric storage assembly; a control terminal of each switch assembly is connected with the control assembly; two ends of each switch assembly are also connected with two ends of the electric storage assembly and / or the other switch assemblies respectively; the positive terminal of each power generating assembly group is also connected with a first voltage input end of the control assembly; an output end of the electric storage assembly is connected with a second voltage input end of the control assembly; and the control assembly is used for controlling opening or closing of the switch assemblies. According to the system provided by the invention, connection and disconnection of a PMOS tube and an NMOS tube are achieved by a simple logic algorithm through an MPPT function, so that the system is simple and reliable to run.

Description

technical field [0001] The invention relates to the general field of spacecraft electrical systems, in particular to a micro-nano satellite power supply system based on a redundant MPPT circuit structure. Background technique [0002] Micro-nano satellites generally refer to satellites with a mass of 1Kg to 10Kg, and their power supply part is generally composed of solar cells and batteries. On the one hand, the size of micro-nano-satellites is extremely small, and the area that can be used to lay out solar cells is extremely limited; on the other hand, the load output curve of solar cells is related to external conditions (light, temperature, and load resistance, etc.). In order to make the micro-nano satellite load obtain more energy from the limited solar cell area, the solar cell is required to work at the maximum power point, and the power system is also required to have high efficiency. In addition, due to the limitations of volume, weight, power consumption and other...

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Problems solved by technology

In addition, due to the limitation of size, weight, power consumption and other factors, the power supply system of micro-nano satellites cannot fully inherit the redundant design ideas of large satellites, and it is necessary to consider the reliability and limited redundancy design.

[0003] Due to the late development of MPPT technology, the existing micro-nano satellite power supply systems generally do not have MPPT functions. Although very few small satellites have MPPT functions, they are all realized by MCU and complex algorithms. The system is complex and the space environment adaptability is relatively low. Low

Moreover, only the maximum power of multiple solar cells connected in series can be obtained. Once one of the single cells decays quickly, the maximum power of the entire string of solar cells cannot be effectively obtained. In addition, the input / output isolation of the current micro-nano satellite power system Schottky diodes are mostly used to realize power isolation and combination, the line voltage drop is large, and the system efficiency is low

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