SLVAFC9 August   2022 TPS61094

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction of Solar Cell and MPPT
    1. 1.1 Traditional MPPT Solution
  4. 2Typical System with Solar cell
    1. 2.1 General Introduction
    2. 2.2 Specific End Equipment
      1. 2.2.1 System Requirements
  5. 3TPS61094 Solution
    1. 3.1 Supercap and Battery Design
    2. 3.2 Solar Panel Design
    3. 3.3 TPS61094 Description and Operation
    4. 3.4 System Solution
  6. 4Test Report Based on TPS61094 Solution
    1. 4.1 Test Waveform
  7. 5References

3.2 Solar Panel Design

According to the requirement of the system, the solar panel needs to fully-charge the supercap with a constant current within 12 hours. And at the same time, it must meet the maximum power output of the rear stage. Combined with the output power, the power of the solar panel must be more than double of the output power. And it needs to be more than 10 mW in this system.

A 15×15 solar panel is used in this system. Actually, the average output power of a 15×15 solar panel should be much more than 6.6 mW. The V-P curve of the solar panel under different lighting conditions are shown in Figure 3-1.

Figure 3-1 V-P Curve of Solar Panels under Different Environment

The maximum power point of the solar panel is basically stable at the same voltage. And the power of the solar panel is more than 10 mW most of the day. Combine with the system requirement, 4.8 V is used as the MPPT point.