3rd review

7/29/2019 3rd Review

http://slidepdf.com/reader/full/3rd-review 1/16



IntroductionAdvanced microcontroller based control .

Buck-Boost regulator wide input range.

Fuzzy based Maximum Power Point Tracking (MPPT).

Reverse polarities protection of PV and battery .

Battery overcharge and over discharge protection .

quick and safe charging for battery.

Temperature compensation.

Automatic cooling fan.

of 17



PROPOSED DESIGN

MODEL

of 17



Description

There are four parameters that are monitored inputs to the fuzzy model:

1) The ,

2) The current flowing through the battery,

3) The analog control voltage that controls the duty cycle of the

PWM chip.

4) The battery voltage,

The output of the fuzzy model is a bipolar voltage signal that is

summed with the control signal to decrease, increase, or leave

unchanged the control voltage input to the PWM chip.

The input and output parameters were fuzzified into three subsets

each – low, medium and high, and triangular/trapezoidal membership

functions used for each variable.of 17



Main features of MPPT

solar charge controller •

In any applications which PV module is energy source, MPPT solarcharge controller is used to correct for detecting the variationsin the current-voltage characteristics of solar cell and shown byI-V curve. •

MPPT solar charge controller is necessary for any solar powersystems need to extract maximum power from PV module; itforces PV module to operate at voltage close to maximum powerpoint to draw maximum available power. •

MPPT solar charge controller allows users to use PV module

with a higher voltage output than operating voltage of batterysystem.

MPPT solar charge controller can be applied to other renewableenergy sources such as small water turbines, wind-powerturbines, etc.

of 17



Fuzzy features The fuzzy logic approach allows a smooth control surface to be

established with a fast development time.

During charging, the solar panel’s operating point is adjustedby modulating the duty cycle of the buck-boost converter’s

switching Device using a fuzzy logic control algorithm tooptimally charge the battery.

Discharge data on the batteries and current voltagecharacteristics of the solar cell will be presented and the fuzzy

logic model development for the charge control will also bepresented.

The current model is not optimized but provides a good initialmodel for the charge control.

of 17



Hardware Modules

Microcontroller(dsPIC30f4013)

Buck-boost Converter(MAX1171)

Liquid Crystal display.Temp Sensor(LM35)

Solar(PV) Panel.

Battery.Charging circuit.

Cooling FAN

of 17



SoftwareIDE for Microcontroller MPLAB IDE

Debugger and Programmer

ICD-2

Programming Language Embedded C

Fuzzy Sets Algorithms Fuzzificztion The fuzzy rule Algorithm defuzzification

of 17



Microcontroller Features

12-bit ADCwith: 100 Ksps conversion rate Up to 13 input channels Conversion available during Sleep and Idle

Memory

48 Kbytes on-chip Flash program space. 2 Kbytes of on-chip data RAM.

four 16bit Compare/PWM output functions.Programmable Low Voltage Detection (PLVD)four 16-bit Capture input functions.five 16bit timers/counters.High current sink/source I/O pins:

25 mA/25 mA

of 17



Pin diagram

of 17



IDE: Integrated Development

EnvironmentSoftware package that lets you assemble,compile, link, export and debug programs.

ICE: In Circuit Emulator:

Hardware that allows you to test the developedprograms on non-real (emulated) hardware. Totest ICE you need IDE.

Programmer:

Is a piece of hardware, e.g. PICkit 2, PM3 thatallow the export of executable .hex files (load)files to the PIC processor’s memory directly. It isdriven by the IDE.



Microcontroller

MPLAB IDE: Free integrated

development environment(IDE) from Microchip toimplement code for PICs

Latest version 8.0

(recommended).

IDE and documentation(user guide) can bedownloaded from the

Microchip website

• To open MPLAB IDE

– StartAll ProgramsMicrochipMPLAB IDE v8.00MPLAB IDE



Buck-Boost

Converter(MAX1771) 90% Efficiency for 30mA to 2A Load

Currents 2V to 16.5V Input Range 110μA

(max) Supply Current.

5μA (max) Shutdown Current.

Preset 12V or Adjustable Output Voltage.

Current-Limited PFM Control Scheme.

Up to 300kHz Switching Frequency.

of 17



Temp Sensor(LM35). Linear + 10.0 mV/°C scale factor.

Rated for full −55° to +150°C range.

0.5°C accuracy guaranteable (at +25°C).

Calibrated directly in ° Celsius (Centigrade).

Suitable for remote applications.

Operates from 4 to 30 volts.

Low cost due to wafer-level trimming.

Less than 60 μA current drain. Low self-heating, 0.08°C in still air.

Nonlinearity only ±1⁄4°C typical.

Low impedance output, 0.1 W for 1 mA load

of 17



Liquid Crystal Display

of 17

high contrast lcd supertwist display.

yellow/green with led backlight.

interface for 4- and 8-bit data bus.

power supply +5v or ±2.7v or ±3.3v.

operating temperature 0~+50°c.

led backlight y/g max. 150ma

no screws required: solder on in pcb only

ncl. hd 44780 or compatible controller



Thank you.

of 17

3rd review

Documents