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Using input regulation alone means that no output voltage regulation is required, but it is still needed as the maximum output voltage should not exceed the maximum charge voltage of the battery. Thus, a secondary feedback loop needs take over from the MPPT loop to limit the output voltage after it surpass set point by forcing it to operate below MPP. This control loop should not saturate the MPPT loop, otherwise it may fail to find the MPP when it is needed. Current regulation is built in to the DCDC controller so it is not something we need to add.
Investigate methods to prevent saturation of MPP controller 9409801.pdf (hindawi.com)
Investigate load current sensing to eliminate the need for a multiplier. Since a battery keeps the output voltage at nearly a constant voltage (in the timescales relevant to the control loop), the output power can be sensed by measuring the output current, which can be used to find dP/dV instead of multiplying panel input voltage and current.
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No multiplier
Input voltage regulation
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No obvious way to limit the output voltage
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P&O used by TokaiBuck-Boost Type MPPT Circuit Suitable for Photovoltaic Generation of Vehicle Installation |
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Pros
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Cons
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Large input perturbations (2-3%)
No multiplier P&OLoad current based analog MPPT controller for PV solar systems |
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Pros
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Other |
Voltage regulation
Input vs output voltage regulation? How to limit output when using input regulation?
Power Stage
Boost
IC | Pros | Cons |
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