About the design of solar array simulator - Power Circuit - Circuit Diagram

MOS power IC full range

Photocoupler

1 Introduction

Solar Energy, generally refers to the radiant energy of sunlight, which is commonly used for power generation in modern times. Since the formation of organisms from the earth, it mainly relies on the heat and light provided by the sun. Since ancient times, humans have also been able to dry objects and use them as methods for preserving food, such as salt and salted fish. However, under the reduction of fossil fuels, it is intended to further develop solar energy. The use of solar energy has two methods: passive utilization (photothermal conversion) and photoelectric conversion. Solar power is an emerging renewable energy source. At present, in the field of aerospace power, most satellite power sources use solar cells as their power core. The performance of satellite power directly affects the performance and working life of the satellite, and has a significant impact on the normal operation and use of the satellite. Therefore, in order to improve the performance and reliability of the power system, it is very important to simulate and test the satellite power system.

The space working conditions of satellites are harsh and complicated, the temperature range is large, the sunshine conditions change rapidly, and the solar cell array is under high-energy particle radiation. The actual solar cell array cannot be used on the ground to reproduce the satellite's working state in space orbit. and therefore it requires a solar cell simulator (solar array simulator, referred to as SAS) to simulate operating conditions of a solar array in space. SAS is an important part of the satellite power simulator. Its main task is to truly follow the actual output characteristic curve of the solar cell array under various complex space conditions. In the ground test phase of the satellite, instead of the solar cell array, it is on the satellite. Each sub-system is powered.

2 Mathematical model of solar cells

Based on the principle of solar cells and the actual measurement results shown in Figure 1, a variety of models were established for solar cell testing and application research. It turns out that these models have sufficient engineering precision.

In the middle

I0———Diode reverse saturation current

q———Electronic charge

I———Battery output current

K———Boltzmann constant

T———absolute temperature

A———Diode quality factor (curve factor), generally A=1～2: