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P&O used by TokaiBuck-Boost Type MPPT Circuit Suitable for Photovoltaic Generation of Vehicle Installation No multiplier P&OLoad current based analog MPPT controller for PV solar systems Other |
Power Stage
Function
Array configuration
String | Cells | Vmpp @ 1000W/m2 | Min Boost Ratio |
|---|---|---|---|
1 | 126 | 79.6V | 95/79.6 = 1.19 |
2 | 136 | 86V | 95/86 = 1.1 |
Seems boost only MPPTs are sufficient for MS15, as even with the lowest battery pack voltage the boost ratio is at the minimum of 1.1. It is possible for Vmpp to be slightly higher if the irradiance is above 1000W/m2, but I don’t think that’s too much of a concern.
Since pack voltage can’t go any higher (limited by motors), a buck-boost topology will be needed for MS16 since array area is increasing to 6m2, or the array will need to be split into 3 strings.
Topology
Since we only need boost mode for now, we will stick with that as it is the simplest option. The same controller can be used in a SEPIC configuration if step-up/down is desired in the future.
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Boost
Buck-BoostLM5176PWPR Texas Instruments | Integrated Circuits (ICs) | DigiKey LTC7878AUH#TRPBF Analog Devices Inc. | Integrated Circuits (ICs) | DigiKey |
Primary FETs
GSFN6982 Good-Ark Semiconductor | Discrete Semiconductor Products | DigiKey
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