Engineering 101

GreenPAK in Solar Systems Maximum Power Point Trackers

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The PV panels are special power supplies that deliver green and renewable power. PV panels have non-constant power based on many parameters (sun irradiation and angle, shadow percentage, temperature, and hotspot effect issue). The solar panel contains a matrix of solar cells that converts the sun irradiation to power.

Connecting more cells in a matrix delivers more power but only 23 to 40% of the maximum power. The MPPTs – Maximum power point trackers – are made to push the solar panel to work at the maximum power point in the power curve. The solar cells in the matrix are not equal and the irradiation and sun angle is not equal over them. While using one MPPT per panel increases the maximum power generated to 65 % of the actual power that the panel can deliver.

Using MPPT per cell is expensive as it uses many components and the board would be bigger than the cell itself. GreenPAK can solve this dilemma by replacing the huge number of components in the MPPT systems by SLG46621 with an inductor or a single GreenPAK and a capacitor bank for the matrix.

The Dialog’s IC can replace the MPPT controllers and sensors, but MOSFETs and the power inductor make up about 70 % of the MPPT circuit. GreenPAK is suitable for almost all MPPT algorithms like perturb and observe, fuzzy control, etc.

Check out Dialog’s application note which demonstrated the full system implementation of a Maximum Power Point Tracker using the ‘Perturb and Observe’ topology. The MPPT will keep the photovoltaic cell working at a voltage that delivers the maximum power.

A designer can connect such a GreenPAK circuit to the system and realize the benefits of very low power consumption, and significant space savings.

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