IRJET- Development of General Purpose Controller Board

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 06 | June 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 3775
DEVELOPMENT OF GENERAL PURPOSE CONTROLLER BOARD
Ms. Aditi Girish Vaidya1, Mr. Lakshman Korra2
1M-Tech in Electronics Design and Technology, National Institute of Electronics & Information Technology
Aurangabad, Maharashtra, India.
2Scientist ‘D’, National Institute of Electronics & Information Technology Aurangabad, Maharashtra, India.
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Abstract - This paper exemplifies the designand development
of a controller board with various peripherals for a different
set of applications. It is portable system which can be used for
controlling, displaying and manipulating the input. A general
purpose controller board is basically a controller board which
enables its use in distinct applications, which ultimately point
out to its compatibility with other devices. The availability of
various peripherals reduces the complexity of the productand
minimizes the cost. Adding to this a temperaturesensorisused
to measure the temperature abode and then quantity is
measured and displayed .This isarealtimemonitoringsystem.
This controller board is designed in order to allow the micro-
controller and devices to communicate with each other
through a serial communication .It is an electronic platform
based on easy to use hardware and software .The task can be
performed by running a set of instruction which is
programmed in a micro-controller.
Key Words: Controller Board, Microcontroller, Analog
Sensing, Communication, Display, Sensor.
1. INTRODUCTION
The conventional integrated design environments for
Microcontroller, FPGA or DSP boards are comparatively
complex and requires the considerable time for learning.
Also, the scientific research in the field of digital and
analogue controlling applications has touched appreciable
heights so that the initial research has sizable complexity
from both practical and theoretical aspect. The controller
comes up having all necessary set of peripheral drivers
guaranteeing long term hardware and software
compatibility. The availability of efficient drivers for the
considered hardware platforms frees the users from the
burden of low levelled programming. At the same time, the
high-level programming approach facilitates software re-
utilization, allowing the laboratory know-how to steadily
grow along time. Lastly when both are integratedproperly,a
well-built setup for Real time (RT) simulations for oriented
application can be carried out.
This will allow the developer to proceed with the
implementation of the controller. In this the section II
elaborates the proposed block diagram, section III includes
the survey, comparison, selectionofthecomponents,section
IV consists the designing blocks for each peripheral and
respective schematic, section V consists of generation of
gerber files for layouting, section VI includes Hardware
Implementation and section VII determines the software
implementation, testing and developmentdetails. Asaresult,
the development of non-trivial applications, for
demonstration as well as for scientific research purposes
requires considerable efforts and relatively long times. All
that, often, discourages students and prevents them from
engaging the challenge altogether. The interest on digital
computationplatforms forthedevelopmentofcontrollersand
real-time simulation systems has increased significantly in
recent years. This isalsodue tothe needs,posedbysmartgrid
applications,forthesimulationofcomplexpowersystem.This
section aims to discuss in greater depth the various
Hardware features of the controller. Each component is
described in terms of its function and capabilities.
2. HARDWARE INTERFACE
2.1 Micro-controller DSPIC33EP128GS806
[1] The controller is controlled by dsPIC3EP device,
configured as an I2C bus slave. The programming of PIC is
done using MPLAB software released by Microchip
Technology Incorporated. The dspic family has many
features which are intended to maximize applicationsuch as
flexibility and reliability and also the cost using different
external components. The features include watchdog timer,
flexible configuration, code guard and code protection, JTAG
boundary scan programming, also Incircuit Serial
Programming (ICSP) and brown out reset (BOR). The
remappable inputs function are mapped at the same time
and to the same pin. If any function has to be performed on
pin that is enabled can be remapped.
Fig -1: dsPIC33EPXXXGS70X/80X Family Block Diagram

2.2 Energy Metering IC ADE7754
The ADE7754 is high accuracy electrical active power
measurement ICs for three-phase applications with a pulse
output. This intended output which is to be used for
calibration purposes are considered. The ADE7754 consists
of the ADCs, reference circuitry and all the signal processing
which is required to perform active power and energy
measurement. An ADE7754 provides Active Energy, RMS
values, temperature measurement and Apparent Energy
information via a serial interface.
Fig -2: Functional Block Diagram
This paper describes the ADE7754 evaluation kit Hardware
and Software functionality. This application note also
describes how the current transducers should be connected
for the best performance. Two external 5V power supplies
and the appropriate current transducers are required.
2.3 Using CT as Current Transducer
The current at secondary is convertedintovoltage byusinga
burden resistance across the secondary winding outputs.
Proper care should be taken when using a Current
transformer as the current transducer. If no burden register
is connected, a large voltage will appear at secondary
outputs. This would result in causing shock hazard and
damaging electronic component. A maximum analog input
range on the Current channel is set to 0.5V. The Gain of
ADE7754 for Current channel should be set to 1.
3. ANALOG INPUTS
All analog input signals are filtered using the on-board anti-
alias filters before being presented to the analog input of
ADE7754. The user can easily make changes according to
these components; however, thisisnotrecommendedunless
the user is familiar with sigma-delta converters and also the
criteria used for selection of the component values for the
analog input filters.
3.1 Current Sense Input
The Current transformer used in this project is AC1005 . As
demonstrated below, connectors allow ADE7754’s current
inputs of phase A, B and C respectively to be connected to
current transducers. The shunt resistors intended to use as
burden resistors when CT’s are used as the current
transducers.
Fig -3: Current Transformer
The RC networks areusedprovidephasecompensation when
a Current Transformer is being used as the current
transducer with the ADE7754. They are anti-alias filters
which are required by the on-chip ADC’s. The default corner
frequency for these LPF’s is selected as 4.8Khz.
Fig -4: Current Transformer connections
3.2 Voltage Sense Input
The voltage inputs connections can be directly connected to
the line voltage sources. The attenuation of line voltages is
done using a simple resistor divider network before it is
presented to the ADE7754. The attenuation network on the
voltage channels has the corner frequency of the network
matches that of the RC (anti-aliasing) filters on the available
current channel inputs [5]. This is important, because if they
do not match there will be large errors at lower power
factors. The modification of attenuation network can be
easily carried out by the user to accommodate any input
signal level. However, the value of resistors with value 1K
should not be altered as the phase response of voltage
channels should not match the current channels. The
maximum signal level endurable at VAP, VBP and VCP is 0.5 V
peak for the ADE7754. ADE7754 analog inputs that can
withstand ± 6V without damage, but the signal range should
not exceed ±0.5 V with respect to AGND. VN, analog input is
connected to AGND via the anti-alias filter.

4. CALCULATIONS
4.1 Voltage Sensing
The fig above determines that the phasevoltagesensedatthe
input is 230V AC. It is essential to obtain the differential
voltage at the output. The differential output is about 0.5 V.
For the purpose its necessary to place a 1M resistor. These
voltages are with respect to the neutral.
V_R = 230 V
V_Y = 230 V
V_B = 230 V
Fig -5: Schematic for voltage Sensing
Here placing a single can cause a problemto entirecircuitory
in case of high voltage input, palcing multiple resistors in
series can help in such situation. SMD resistors 1206 are
used with value of 333K each. Using voltage dividerformula.
VAP = [R2 / (R1+R2)] X VIN … (1)
VAP = [1K / (1K+(333K X 3)] X 230
VAP = 0.23V
VAP= 200-300mV
4.2 Current Sensing
In Fig.3. the current transformers areusedforsteppingdown
the current. TALEMA Group’s AC1005 is used for the
purpose. The CT is best suited for sensing overload
protection, ground fault detection, metering and analog to
digital circuitories. It has 5A nominal primary current and
the maximum of 60 Amp is specified. The CT has nominal
turns ratio of 1000:1. The terminating resistor and the one
turn primary are not altered.
Fig 6: Schematic For Current Sensing
4.3 Temperature Sensing
The temperature is measuredwithICLM35DT.Theoutputof
temperature sensor is connected to the ADC circuit for
digitalizing. But the IC to which the output is given does not
accepts the output in terms of negative value. Hence there is
need of connecting a Level Shifter for sensing output. The
level shifter circuit is developed using the Operational
Amplifier IC LM321.
Fig -7: Level Shifter for Temperature Sensing
Check the temperature range (2˚C - 150˚C) of system where
the IC is placed. In our case it is approx. 62˚C.
Vout at 150˚C = 1500mV =1.5 V ≈ 3.3 V
Vout at 25˚C = 250mv
Vout at -55˚C = (-550 mV) = -0.5V ≈ 0V
Case 1: When input voltage is 1.5.
V1 = 1.5, V2 = 0.5 V
Vo =3 X [V1 X {(9.948)/ (9.948+10)} +
{0.5 X(10)/(10K+9.1K)]
= 3 X [1.5(0.49+0.26)]

= 3 X (0.74+0.26)
= 3.3V
Case 2: When input voltage is -0.5.
V2 = - 0.5, V2 = 0.5
Vo = 3 X [-0.5 X (0.49 + 0.26)]
= 0V
5. RESULTS
The devices thus used are related to industrial application
based on real time value taken from the IC ADE7754. Some
instructions prefetch mechanism helps maintain throughput
and provides predicatable execution.
Fig -8: Voltage output Vs. Current Plot
Most instructions execute in single cycle effective excecution
rate, with the exception of instructions. Based on VIH and VIN
value the pin will act as source or sink for current with
respect to the pin of controller. Once the parameterization is
done, it is put on manual mode to check everybankcommand
is being transmitted to the switch.
Fig -9: VOH Vs. IOH Plot
The permanent current monitoring inside the compensation
system the measuring device should be able to determine the
sum current of the complete system as well current of single
branches.
Fig -10: VOL Vs. IOL Plot
6. CONCLUSION
The consequent development of the new innovative ideas
and a multitude of functions. Several parameters that canbe
edited allow an optimized adjustment to the different
modules. This module is distinguished by user friendly
operation based on menu guided displays in plain text. Its
features permit an intuitive mode of operation.
ACKNOWLEDGEMENT
I would like to express our profound sense of gratitude and
appreciation to guide Mr. Lakshman Korra for his valuable
guidance, continuous encouragement and help rendered in
carrying out the work presented in this report. His constant
support has been the impetus for this work. It is his timely
advice and friendly discussion, which has helped in framing
this report. I am specially thankful to executive director Dr.
Sanjeev Kumar Gupta for reviewing the manuscript and the
valuable comments and suggestions he offered during the
presentation of this report.
REFERENCES
[1] dsPIC33EP128GS806Digital PowerPIMUser’sGuide.
[2] Microchip Application Notes
[3] Arjun Yadav and G. Narayanan: A Inexpensive Digital
Controller for Power Electronic Applications.
[4] Nick Davis: Safety Capacitors First- X capacitor and Y
capacitors
[5] https://nptel.ac.in/courses/Webcourse-contents/IIT-
ROORKEE/Analog%20circuits/lecturers/lecture_15/lecture
15_page2.html

IRJET- Development of General Purpose Controller Board

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