Pardon the potentially silly question.
I have been reading about photovoltaic (PV) cells and max power point tracking (MPPT). From what I understand, a MPPT module can use a DC-DC converter to change the voltage on the PV's terminals to its corresponding MPP voltage (Vm). My question is, how are the PV cells terminal voltage clamped to Vm? For example, the PV terminal voltage is 20 V and Vm is 17 V. Can we create a circuit like this to achieve MPP?
PV 20V->DC-DC Converter 17V -> Other stuff
This means that the PV terminal voltage is still at 20 V.
Or, do we need to accomplish this?
PV 17V -> Other stuff
Where a DC-DC converter forces the terminal PV voltage to be 17 V. If this is the case, how is this actually done?
I feel like I'm missing something really obvious.