Business LTC sampling buck-boost charge controller with maximum power point tracking

Business LTC sampling buck-boost charge controller with maximum power point tracking

2013/12/02

Linear Tech is inviting sample applications for a buck-boost lead-acid battery charge controller with maximum power point tracking designated LT8490.

The chip is designed to be a complete solution for solar panel-based battery chargers. It has true maximum power point tracking (MPPT). It will reject false maximas and track changes in solar panels etc.

No software or firmware development is required.

Target markets are grid solar/battery-powered equipment; LED lighting station power;oil well monitoring and highway messaging.

Key features are:

•VIN Range 6V to 80V
•VBAT Range 1.3V to 80V
•Single Inductor Allows VIN Above, Below, or Equal to VBAT
•Automatic MPPT for Solar Sources
•Automatic Temperature Compensation
•Input and Output Current Monitor Pins
•4 Integrated Feedback Loops, 3 With Status Pins
•Lead-Acid and Lithium Charge Algorithms
•Synchronizable Fixed Frequency: 100kHz to 400kHz
•No Software Development Required
•64-Pin 7mm x 11mm x 0.75mm QFN Package
APPLICATIONS:
•Solar or Wind Powered Battery Chargers
•Multiple Types of Lead Acid and Lithium Battery Chargers

MPPT is needed to extract the maximum power from the panel under all operating conditions including partial shade (leaves, bird droppings, shadows, snow, etc); panel temperature variation and panel aging.

MPPT’s benefits include that, off-grid solar panel systems, failure of the power system is costly; customers want to extract the most power they can from the panel; customers want to maximize the time interval needed between maintenance visits to the solar installation.

Solar panels (and wind/hand crank generators) are non-ideal power supplies over any reasonable operating range. They do not maintain stable output voltage or current as their load or input energy changes. Left by themselves, they will waste a large portion of their input energy unless their available output power is maximized and tracked as input conditions change.

The LT8490 implements MPPT by a modified incremental conductance (perturb and observe) method to track in real time. The device automatically uses MPPT when the input power supply (i.e., a solar panel) is too weak to maintain the maximum current and voltage limits in the charging profile.

A common problem for MPPT is the partial shading of a solar panel, which results in a number of local power maxima that can fool the controller into tracking a local power point that is not really the maximum. The IC mitigates this problem by periodically scanning the panel voltage from VINMAX to VINMIN to find the highest power point, which becomes the new MPP. The frequency of the scan is every 3 minutes. The duration is 1.75sec but can vary slightly depending on operating conditions.

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