Abstract
In this paper, the photovoltaic cell is combined with the analog battery pack and the load through a three-port DC-DC Buck circuit, which gives power to the analog battery pack and load. From the perspective of simulation, the photovoltaic cell is lowered to reach respective specific values through the two Buck circuits at the output end of it and to give power to the load and the simulated battery pack. The influence of Pulse Width Modulation (PWM) duty ratio output on voltage and the influence of PWM frequency on load voltage and current limiting resistance of the power supply system is studied from the angle of power conversion. The results show that when the PWM duty ratio is changed, the actual output voltage does not reach the theoretical value, and is somewhat less than the theoretical value. When the frequency is less than 100 KHz and the inductance value is less than or equal to 100 uH, under the same other conditions, the load voltage decreases first and then increases with the increase of frequency. The larger the inductance value is, the faster the voltage drops, and the smaller the inductance value is, the faster the voltage increases. When the inductance reaches 250 uH, the inductance value continues to increase, which has little influence on the load voltage, and the load voltage generated by different inductance values only has a small error. If the output frequency of PMW is too high or too low, the output voltage will be reduced. The maximum voltage value is between 90 and 100 KHz. When the current limiting resistance is 18.5 Ω, it is close to and does not exceed the maximum charging voltage of the analog battery string.
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