There are many ways to realize MPPT, such as perturb and observe, incremental conductance, current sweep, temperature method and constant voltage (A survey of maximum PPT techniques of PV systems). Different ways have their own advantages and disadvantages, and have different requirements for hardware and algorithms.

And the constant voltage way is one of the earlier strategies. It takes advantage of the fact that the maximum power point of the solar cell is almost on the same vertical line under the condition of constant temperature. A controller is used between the solar panel and the load to make the output voltage constant to realize simple MPPT function. It is suitable for applications with stable external environment (Simulation and Hardware Implementation of New Maximum Power Point Tracking Technique for Partially Shaded PV System Using Hybrid DEPSO Method). This application note is also using constant voltage to realize MPPT in system.