Analysis of mppt based charge controller PDF

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TABLE OF CONTENTS
ANALYSIS OF MPPT BASED CHARGE CONTROLLER...................................................................1
1. Circuit:..........................................................................................................................1
Component and their functions:......................................................................................2
Synchronous buck converter...............................................................................................2
Controller:............................................................................................................................2
led driving circuit..................................................................................................................2
MNIPROG.............................................................................................................................2
 Component values........................................................................................................2
 Sketch:..........................................................................................................................3
2. Block diagram...............................................................................................................3
Project process.........................................................................................................................4
3. Outcome/ results..........................................................................................................5
Solar Panel...............................................................................................................................5
Calculations..............................................................................................................................5
MPPT Algorithm Detail........................................................................................................5
BATTERY SELECTION................................................................................................................7
CHARGE CONTROLLER OPERATION.........................................................................................8
References..............................................................................................................................9
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ANALYSIS OF MPPT BASED CHARGE CONTROLLER
1. Circuit:
The circuit diagram of synchronous buck converter is shown in fig.2.
Component and their functions:
Synchronous buck converter
The synchronous buck converter is straightforward in concept, and is used heavily in consumer
electronics. A synchronous buck converter produces a regulated voltage that is lower than its
input voltage, and can deliver high currents while minimizing power loss(Venkatramanan &
John, 2019).
Controller:
Meanwhile controller senses the voltage of both solar panel and battery to optimize the power
transfer through its intelligently designed MPPT algorithm.
led driving circuit
Two led driving circuit has also been embedded on kit, one is buck driver which further reduces
the battery voltage to 8V and other is boost driver to increase the batter output voltage to 40V.
But the design has capability to only connect one load at a time to avoid over loading on the
circuit. Both buck and boost converter are dc-dc converter which served the subject job.
MNIPROG
MNIPROG is brain to control the whole operation of PowerPSoC. The bottom block has control
circuitry for board kit protection from short circuit current, overloading, switching both led
drivers and charging control of battery. The most important part of solar charger is it maximum
power point tracking algorithm to optimize the output from solar panel(Raj, Arya, & Gupta,
2020). If we don’t have this part then we are wasting solar power by directly connecting it to
battery.
Component values
Consider a case of full noon and solar panel is generating more than the charging threshold
voltage of battery like anywhere between 15-21V, whereas the current is not enough to charge
the battery before it to be utilized on its peak. For this situation there is a need to design some
circuitry with a brain to automatically reduce the excess of generated voltage and increase the
solar panel current. This purpose is served by MPPT algorithm and through this algorithm
synchronous buck converter controls it output voltage while increasing the current so that
maximum energy can be transferred to battery. There are many MPPT algorithms but mostly
perturb and observation (P&O) and incremental conductance (IC) are preferred due to their very
practical approach(Anowar & Roy, 2019). In above said controller both voltage and current are
sensed and decision is made on change in conductance.
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