SLVAFT9 June   2024 TPS61022 , TPS61023

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction of Photovoltaic Cell and MPPT Requirement
  5. 2Typical Battery Powered Outdoor System with PV Panel
  6. 3MPPT Method with Generic DC/DC Converter
    1. 3.1 TPS61023 Introduction
    2. 3.2 Hysteresis Control MPPT Method with TPS61023
    3. 3.3 Experiment Results
  7. 4Summary
  8. 5References

3.3 Experiment Results

Test result with a real PV panel in different sunlight, with a test setup is listed in Table 3-2.

Table 3-1 Test Setup
Parameters Values
Solar Panel 0.6V, 200mA solar cells × 6
Charge Current 1A
Charge Voltage 4.2V

As shown in Figure 3-4, when the PV panel voltage is up to 2.9V, the DC/DC converter starts to work and charge the battery with 1A charging current, and when PV panel voltage is lower than 2.2V, the DC/DC converter stops working and the charging current is 0A. By this way, the voltage of PV panel is approximately triangular wave during operation, the PV panel voltage is always around MPP, and so the PV panel operates with the highest efficiency. The MPPT is realized by this circuit.

Generic Hysteresis Control MPPT Method Test Figure 3-4 Generic Hysteresis Control MPPT Method Test

Note that, TPS61023 loses true disconnection feature when disabled with this hysteresis control circuit. When the Boost converter is turned off, VPV is connected to VOUT via the body diode of internal high side FET, therefore at this time VOUT isn't 0V. If the true disconnection when disabled is needed, additional circuit as shown in Figure 3-5 can be used.

True Load Disconnection Circuit Figure 3-5 True Load Disconnection Circuit