Design of Intelligent Electronic Meters Based on GPRS
TELKOMNIKA, Vol.14, No.3A, September 2016, pp. 92~97
ISSN: 1693-6930, accredited A by DIKTI, Decree No: 58/DIKTI/Kep/2013
DOI: 10.12928/TELKOMNIKA.v14i3A.4423
92
Design of Intelligent Electronic Meters Based on GPRS
1
Chunfeng Li*1, Dandan Sun2, Wusheng Tang3
Electronic Information Engineering College of Changchun University, Changchun, 130022, China
2
Foreign Language College of Changchun University, Changchun, 130022, China
3
Mechanical and Vehicle Engineering College of Changchun University, Changchun, 130022, China
*Corresponding author, email: 107961758@qq.com Tel: +86-0431-85250282
Abstract
The essay first sets forth a general design scheme about software and hardware circuits of
intelligent electronic meters based on GPRS, then separately designs energy measurement chips, GPRS
communication modules, power units and a flow chart of partial main programs in the systematic design
scheme.
Keywords: GPRS communication module, electronic meter, AT89S52 single chip
Copyright © 2016 Universitas Ahmad Dahlan. All rights reserved.
1. Introduction
In recent years, with the advancement of science and technology and the development
of city modernization, the electronic power industry in our country steps into the express lane of
unprecedentedly rapid development. At the same time, our country implements the policy of “a
house, an electric city meter”. Original manual meter-reading work requires workers to go to
each house, heavy workload, high labor intensity, low efficiency and inconvenience to residents’
daily life, it exposes a lot of deficiencies and disadvantages, so traditional manual meter-reading
work can fit the present situation [1]. In order to make resident’s power using mode more
rationalization and higher efficiency and improve management effectiveness of power supply
branch, it is necessary to reform tradition meter-reading working mode in order to satisfy rapid
development of our country’s economy and society. At present, the technology of meter reading
in our country includes manual work, RS485bus, IrDA and power line carrier, etc. Among them,
the technologies which are mature and more widely adopted are RS485 bus and infrared meterreading techniques. But RS485 bus needs wiring and only can be carried out in small areas; the
infrared meter reading technique also needs workers to read meters on the spot; power line
carrier can only be used in a small area less then 1,000 meters and its technique also exists
some problems. Under such circumstance, people are in urgent need of multifunctional
intelligent electronic meters. So the essay presents the design and research of intelligent
electronic meters based on GPRS to achieve remote, read-time, and automatic meter reading
[2].
2. GPRS Remote Meter-Reading System
GPRS remote meter-reading system is an automatic electric power management meterreading system based on GPRS techniques. It is based on GPRS service platform of Mobile
Communication Corporation to construct remote electric power meter-reading system. It can
use IP supplied by GPRS mobile network system to realize wireless transmission of ammeter
data. It has a series of virtues, such as timely data collection, remote control and management,
small investment, short construction period, large transmission capacity and large meter-reading
capacity, etc., which have been widely valued by scholars at home and abroad, and become the
hot and difficult point of present research [3].
3. General Design Scheme
The general design scheme of intelligent electronic meters based on GPRS is shown in
Figure 1. the design scheme takes the AT89S52 as the core to design measurement chips, the
Received March 20, 2016; Revised July 25, 2016; Accepted August 2, 2016
93
ISSN: 1693-6930
memory cell EEPROM, communication units, display units, power supply units and sample
circuits of voltage of voltage and electric current. GPRS adopts M590 module produced by
Shenzheng Yongfang Science and Technology Ltd. The module adopts solution of Infineon
Tech T880 single chip, supplies the function of SMS and data and has internationally
certificated GPRS R4 agreement and the serial port CMUX function; the metering unit of
electrical energy adopts specified CS5460A electrical energy metering-unit produced by
America Cirrus Logic Company to endure accuracy of electrical energy metering; MCU is the
core component of this intelligent electronic meter design, and it adopts the specified AT89S52
single chip which has the characteristics of high Anti-jamming, low power consumption as the
major controller to make the system operation steady and reliable; the memory unit EEPROM is
used to store active and reactive power electricity of intelligent electronic meters; RS485 and
infrared ports are mainly applied to local communication [4]. Simultaneously in order to display
and watch conveniently, the design uses liquid crystal display which can show operational state,
electric quantities of intelligent electronic meters and error information/failure message in real
time.
4. Design of Hardware Circuit
The MCU adopted in the essay is the more advanced AT89S52 single chip at present;
its structure chart of pins is shown as Figure 2. AT89S52 produced through Atmel Company’s
highly dense, nom-vulnerable memory techniques is a kind of low power consumption, high
performance index, 8 bit microcontroller which is compatible with 80C51 chip. At the same time,
it has 8k byte, programming allowable flash memory, smart eight-bit CPU, 2 bit I/O port line, 256
byte RAM, 2 data pointers, watch dog timer, three 16 bit timer/counter, full duplex serial port,
crystal oscillator, clock circuit and one six-vector, two-level interrupt structure. Additionally,
AT89S52 is in idle mode, the CPU stops work, but timer/counter, RAM, port line, blackout can
still work; when chip AT89S52 is in power down modes, chip AT89S52 cannot work until a
blackout or hardware resets.
CS5460A energy measure chip produced by America Cirrus Logic Company is the
energy measurement chip of uniphase bidirectional power. Its internal pin assignment was
shown as the following Figure 3. It includes active power calculation engine, 2 programmable
gain amplifiers, and 2 high pass filter, etc. which can measure and calculate active electric
energy, instantaneous power, supple data samples of instantaneous voltage/current/power, and
develop uniphase two-wire or three wire electric meters. CS5460A can use diverter or sensor to
measure electric current, divider resistance and resistance sensor to measure voltage. At the
same time, it has the b bidirectional serial interface to communicate with microcontrollers; output
pulse frequency is in proportionate to active power. When CS 5460A works, it does not need
add extra microcontroller, so when electric meters are used to measure electric energy in
houses or businesses on a large scale, the cost of electric meters will be largely reduced.
GPRS communication module adopts the M590 module produced by Shengzhen
Youfang Science and Technology Ltd. This module adopts solution program of single chip
Infineon Tech 7880 to supply message and data and has GPRS R agreement which are
universally certificated, the serial interface, CMUX function and SAIC elimination technology of
single-antenna obstacles to solve the problem of receiving signals in remote mountainous
areas.
The circuit of power units is shown as shown as Figure 4. In this design, electric meters
adopt linear DC regulated power supplies. They firstly turn AC voltages from power grid into
pulse DC voltage through transformers and stable bridge rectifier circuit, and then change into
continuously adjustable output voltage of amplitude through filter circuits. Filter capacitors of
input terminal C1 and C2 can eliminate disturbing impulse of power units caused by inductive
effect and capacitor C3 is designed to reduce ripple voltage of R2’s two ends, protective diodes
VD1 and VD2 are designed to prevent reverse voltage from penetrating voltage regulators.
From the designed circuits we can know: when resistance of adjustable resistor R2 is regulated
size of LM317 output voltage can be adjust; simultaneously when the resistance of R is
adjusted, because the voltage add on the two ends of LED change, the luminance will change
with increase and decrease of LED R2’s resistance. The spare battery is prepared to prevent
electronic meters from loss of power when the AC power supply suddenly breaks down. When
TELKOMNIKA Vol. 14, No. 3A, September 2016 : 92 – 97
ISSN: 1693-6930
TELKOMNIKA
94
the detection chip of the power supply tests the power failure of electronic meters, the spare
battery will supply power immediately.
5. Results and Analysis
The design of software sector is shown as Figure 5. T he essay adopts the module
design according to different function to define mutual coordinate relationship. After the
initialization of the system, the data stored in EEPROM memory cell of electric meters begins to
be read, and configured; after configuration, the data in energy measurement chip CS 5460A is
read and TCP link is set to convey data which are display on the screen at last. At the same
time, overpressure detector and over-current detection of voltage/current sample is designed.
The whole design employs the method of sequential execution and carries out scanning each
custom mark bit and checking whether movement is needed. If needed, step into corresponding
program to operate [5-7].
Figure 1. General scheme of intelligent electric meters based on GPRS
(T2)P1.0
(T2EX)P1.1
P1.2
P1.3
P1.4
(MOSI)\P1.5
(MISO)P1.6
(SCK)P1.7
RST
(RXD)P3.0
(TXD)P3.1
(INTO)P3.2
(INT1)P3.3
(TO)P3.4
(T1)P3.5
(WR)P3.6
(RD)P3.7
XTAL2
XTAL1
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
AT89S52
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
VCC
P0.0(AD0)
P0.1(AD1)
P0.2(AD2)
P0.3(AD3)
P0.4(AD4)
P0.5(AD5)
P0.6(AD6)
P0.7(AD7)
EA/VPP
ALE/PROG
PSEN
P2.7(A15)
P2.6(A14)
P2.5(A13)
P2.4(A12)
P2.3(A11)
P2.2(A10)
P2.1(A9)
P2.0(A8)
Figure 2. Structure chart of AT89S52 pins
Design of Intelligent Electronic Meters Based on GPRS (Chunfeng Li)
95
ISSN: 1693-6930
Figure 3. Internal pin assignment of CS5460A
VD1
LM317
VIN VOUT
ADJ
VD2
C1
C2
R1
C4
C3
R2
R3
Figure 4. Circuit schematics of power units
TELKOMNIKA Vol. 14, No. 3A, September 2016 : 92 – 97
ISSN: 1693-6930
TELKOMNIKA
96
Main program begins
Voltage /
current
sample
System initialization
Sample
overvoltage
current
Read data from EEPROM
N
complete
configuration
Y
Order of delivering
and stopping
electricity
N
N
Y
Finish sample ?
Open break - off
Y
Sample data
processing
Read CS 5460A
Calculate power and store
Y
Network
initialization
Singals invalid
N
N
Copy order
Local order
Y
Y
N
Establish TCP link and
carry out data
transmission
Turn off power of
GPRS and reset
Y
Arrive time delay of
GPRS or not
Local data
communication
LED display
processing
N
Y
Screen display
N
Y
Under voltage of
power failure
Preservation
processing of
communication data
N
Figure 5. Principal program flow chart of software sector
6. Conclusion
Trough the design and research of intelligent electric meters based on GPRS, the essay
introduced the pins of AT89S52 single chip and their functions and designed circuits of energy
measurement chip, GPRS communication module, power units and other main hardware and
main programs flow chart of software. These supply theoretical support for further related
research.
Design of Intelligent Electronic Meters Based on GPRS (Chunfeng Li)
97
ISSN: 1693-6930
Conflict Of Interest
The author confirms that this article content has no conflict of interest.
Acknowledgement
During the process of writing, parts of teachers in Changchun University have given me
great help. Here give my sincere appreciation to them.
References
[1]
[2]
[3]
[4]
[5]
[6]
[7]
Hao FZ. Design and application of GPRS remote multifunctional electric meters. Jiangxi Electric
Power. 2011; 35(4):21-25.
Yang CC, Lin YC, Cheng HH. High Performance Resonant Tunneling Electronic Circuit with Suitable
Resistance Parameters. TELKOMNIKA Indonesian Journal of Electrical Engineering. 2012; 10(6):
1333-1340.
Wang XL, Li N. Study on interharmonics detection method based on windowed interpolation FFT
algorithm. Modern Power. 2012; 29(5): 28-31.
Q Zhang, S Xue. An improved multi-objective particle swarm optimization algorithm. Lecture Notes
in Computer Science. 2007; 4683(1): 372-381.
Gang Li, Xiaofeng Zhao, Dianzhong Wen, Yang Yu. Research on Silicon-based Planar Spiral
Inductance Coil Based on Microelectromechanical System. TELKOMNIKA (Telecommunication
Computing Electronics and Control). 2015; 13(4): 1127-1132.
Mistry DP, Trivedi KR. Development of Online Environmental Monitoring System with Location
Awareness. Bulletin of Electrical Engineering and Informatics. 2012; 1(2): 123-130.
Aluvalu R K, Kamliya V, Muddana L. HASBE access control model with Secure Key Distribution and
Efficient Domain Hierarchy for cloud computing. International Journal of Electrical and Computer
Engineering (IJECE). 2016; 6(2): 770-777.
TELKOMNIKA Vol. 14, No. 3A, September 2016 : 92 – 97
ISSN: 1693-6930, accredited A by DIKTI, Decree No: 58/DIKTI/Kep/2013
DOI: 10.12928/TELKOMNIKA.v14i3A.4423
92
Design of Intelligent Electronic Meters Based on GPRS
1
Chunfeng Li*1, Dandan Sun2, Wusheng Tang3
Electronic Information Engineering College of Changchun University, Changchun, 130022, China
2
Foreign Language College of Changchun University, Changchun, 130022, China
3
Mechanical and Vehicle Engineering College of Changchun University, Changchun, 130022, China
*Corresponding author, email: 107961758@qq.com Tel: +86-0431-85250282
Abstract
The essay first sets forth a general design scheme about software and hardware circuits of
intelligent electronic meters based on GPRS, then separately designs energy measurement chips, GPRS
communication modules, power units and a flow chart of partial main programs in the systematic design
scheme.
Keywords: GPRS communication module, electronic meter, AT89S52 single chip
Copyright © 2016 Universitas Ahmad Dahlan. All rights reserved.
1. Introduction
In recent years, with the advancement of science and technology and the development
of city modernization, the electronic power industry in our country steps into the express lane of
unprecedentedly rapid development. At the same time, our country implements the policy of “a
house, an electric city meter”. Original manual meter-reading work requires workers to go to
each house, heavy workload, high labor intensity, low efficiency and inconvenience to residents’
daily life, it exposes a lot of deficiencies and disadvantages, so traditional manual meter-reading
work can fit the present situation [1]. In order to make resident’s power using mode more
rationalization and higher efficiency and improve management effectiveness of power supply
branch, it is necessary to reform tradition meter-reading working mode in order to satisfy rapid
development of our country’s economy and society. At present, the technology of meter reading
in our country includes manual work, RS485bus, IrDA and power line carrier, etc. Among them,
the technologies which are mature and more widely adopted are RS485 bus and infrared meterreading techniques. But RS485 bus needs wiring and only can be carried out in small areas; the
infrared meter reading technique also needs workers to read meters on the spot; power line
carrier can only be used in a small area less then 1,000 meters and its technique also exists
some problems. Under such circumstance, people are in urgent need of multifunctional
intelligent electronic meters. So the essay presents the design and research of intelligent
electronic meters based on GPRS to achieve remote, read-time, and automatic meter reading
[2].
2. GPRS Remote Meter-Reading System
GPRS remote meter-reading system is an automatic electric power management meterreading system based on GPRS techniques. It is based on GPRS service platform of Mobile
Communication Corporation to construct remote electric power meter-reading system. It can
use IP supplied by GPRS mobile network system to realize wireless transmission of ammeter
data. It has a series of virtues, such as timely data collection, remote control and management,
small investment, short construction period, large transmission capacity and large meter-reading
capacity, etc., which have been widely valued by scholars at home and abroad, and become the
hot and difficult point of present research [3].
3. General Design Scheme
The general design scheme of intelligent electronic meters based on GPRS is shown in
Figure 1. the design scheme takes the AT89S52 as the core to design measurement chips, the
Received March 20, 2016; Revised July 25, 2016; Accepted August 2, 2016
93
ISSN: 1693-6930
memory cell EEPROM, communication units, display units, power supply units and sample
circuits of voltage of voltage and electric current. GPRS adopts M590 module produced by
Shenzheng Yongfang Science and Technology Ltd. The module adopts solution of Infineon
Tech T880 single chip, supplies the function of SMS and data and has internationally
certificated GPRS R4 agreement and the serial port CMUX function; the metering unit of
electrical energy adopts specified CS5460A electrical energy metering-unit produced by
America Cirrus Logic Company to endure accuracy of electrical energy metering; MCU is the
core component of this intelligent electronic meter design, and it adopts the specified AT89S52
single chip which has the characteristics of high Anti-jamming, low power consumption as the
major controller to make the system operation steady and reliable; the memory unit EEPROM is
used to store active and reactive power electricity of intelligent electronic meters; RS485 and
infrared ports are mainly applied to local communication [4]. Simultaneously in order to display
and watch conveniently, the design uses liquid crystal display which can show operational state,
electric quantities of intelligent electronic meters and error information/failure message in real
time.
4. Design of Hardware Circuit
The MCU adopted in the essay is the more advanced AT89S52 single chip at present;
its structure chart of pins is shown as Figure 2. AT89S52 produced through Atmel Company’s
highly dense, nom-vulnerable memory techniques is a kind of low power consumption, high
performance index, 8 bit microcontroller which is compatible with 80C51 chip. At the same time,
it has 8k byte, programming allowable flash memory, smart eight-bit CPU, 2 bit I/O port line, 256
byte RAM, 2 data pointers, watch dog timer, three 16 bit timer/counter, full duplex serial port,
crystal oscillator, clock circuit and one six-vector, two-level interrupt structure. Additionally,
AT89S52 is in idle mode, the CPU stops work, but timer/counter, RAM, port line, blackout can
still work; when chip AT89S52 is in power down modes, chip AT89S52 cannot work until a
blackout or hardware resets.
CS5460A energy measure chip produced by America Cirrus Logic Company is the
energy measurement chip of uniphase bidirectional power. Its internal pin assignment was
shown as the following Figure 3. It includes active power calculation engine, 2 programmable
gain amplifiers, and 2 high pass filter, etc. which can measure and calculate active electric
energy, instantaneous power, supple data samples of instantaneous voltage/current/power, and
develop uniphase two-wire or three wire electric meters. CS5460A can use diverter or sensor to
measure electric current, divider resistance and resistance sensor to measure voltage. At the
same time, it has the b bidirectional serial interface to communicate with microcontrollers; output
pulse frequency is in proportionate to active power. When CS 5460A works, it does not need
add extra microcontroller, so when electric meters are used to measure electric energy in
houses or businesses on a large scale, the cost of electric meters will be largely reduced.
GPRS communication module adopts the M590 module produced by Shengzhen
Youfang Science and Technology Ltd. This module adopts solution program of single chip
Infineon Tech 7880 to supply message and data and has GPRS R agreement which are
universally certificated, the serial interface, CMUX function and SAIC elimination technology of
single-antenna obstacles to solve the problem of receiving signals in remote mountainous
areas.
The circuit of power units is shown as shown as Figure 4. In this design, electric meters
adopt linear DC regulated power supplies. They firstly turn AC voltages from power grid into
pulse DC voltage through transformers and stable bridge rectifier circuit, and then change into
continuously adjustable output voltage of amplitude through filter circuits. Filter capacitors of
input terminal C1 and C2 can eliminate disturbing impulse of power units caused by inductive
effect and capacitor C3 is designed to reduce ripple voltage of R2’s two ends, protective diodes
VD1 and VD2 are designed to prevent reverse voltage from penetrating voltage regulators.
From the designed circuits we can know: when resistance of adjustable resistor R2 is regulated
size of LM317 output voltage can be adjust; simultaneously when the resistance of R is
adjusted, because the voltage add on the two ends of LED change, the luminance will change
with increase and decrease of LED R2’s resistance. The spare battery is prepared to prevent
electronic meters from loss of power when the AC power supply suddenly breaks down. When
TELKOMNIKA Vol. 14, No. 3A, September 2016 : 92 – 97
ISSN: 1693-6930
TELKOMNIKA
94
the detection chip of the power supply tests the power failure of electronic meters, the spare
battery will supply power immediately.
5. Results and Analysis
The design of software sector is shown as Figure 5. T he essay adopts the module
design according to different function to define mutual coordinate relationship. After the
initialization of the system, the data stored in EEPROM memory cell of electric meters begins to
be read, and configured; after configuration, the data in energy measurement chip CS 5460A is
read and TCP link is set to convey data which are display on the screen at last. At the same
time, overpressure detector and over-current detection of voltage/current sample is designed.
The whole design employs the method of sequential execution and carries out scanning each
custom mark bit and checking whether movement is needed. If needed, step into corresponding
program to operate [5-7].
Figure 1. General scheme of intelligent electric meters based on GPRS
(T2)P1.0
(T2EX)P1.1
P1.2
P1.3
P1.4
(MOSI)\P1.5
(MISO)P1.6
(SCK)P1.7
RST
(RXD)P3.0
(TXD)P3.1
(INTO)P3.2
(INT1)P3.3
(TO)P3.4
(T1)P3.5
(WR)P3.6
(RD)P3.7
XTAL2
XTAL1
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
AT89S52
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
VCC
P0.0(AD0)
P0.1(AD1)
P0.2(AD2)
P0.3(AD3)
P0.4(AD4)
P0.5(AD5)
P0.6(AD6)
P0.7(AD7)
EA/VPP
ALE/PROG
PSEN
P2.7(A15)
P2.6(A14)
P2.5(A13)
P2.4(A12)
P2.3(A11)
P2.2(A10)
P2.1(A9)
P2.0(A8)
Figure 2. Structure chart of AT89S52 pins
Design of Intelligent Electronic Meters Based on GPRS (Chunfeng Li)
95
ISSN: 1693-6930
Figure 3. Internal pin assignment of CS5460A
VD1
LM317
VIN VOUT
ADJ
VD2
C1
C2
R1
C4
C3
R2
R3
Figure 4. Circuit schematics of power units
TELKOMNIKA Vol. 14, No. 3A, September 2016 : 92 – 97
ISSN: 1693-6930
TELKOMNIKA
96
Main program begins
Voltage /
current
sample
System initialization
Sample
overvoltage
current
Read data from EEPROM
N
complete
configuration
Y
Order of delivering
and stopping
electricity
N
N
Y
Finish sample ?
Open break - off
Y
Sample data
processing
Read CS 5460A
Calculate power and store
Y
Network
initialization
Singals invalid
N
N
Copy order
Local order
Y
Y
N
Establish TCP link and
carry out data
transmission
Turn off power of
GPRS and reset
Y
Arrive time delay of
GPRS or not
Local data
communication
LED display
processing
N
Y
Screen display
N
Y
Under voltage of
power failure
Preservation
processing of
communication data
N
Figure 5. Principal program flow chart of software sector
6. Conclusion
Trough the design and research of intelligent electric meters based on GPRS, the essay
introduced the pins of AT89S52 single chip and their functions and designed circuits of energy
measurement chip, GPRS communication module, power units and other main hardware and
main programs flow chart of software. These supply theoretical support for further related
research.
Design of Intelligent Electronic Meters Based on GPRS (Chunfeng Li)
97
ISSN: 1693-6930
Conflict Of Interest
The author confirms that this article content has no conflict of interest.
Acknowledgement
During the process of writing, parts of teachers in Changchun University have given me
great help. Here give my sincere appreciation to them.
References
[1]
[2]
[3]
[4]
[5]
[6]
[7]
Hao FZ. Design and application of GPRS remote multifunctional electric meters. Jiangxi Electric
Power. 2011; 35(4):21-25.
Yang CC, Lin YC, Cheng HH. High Performance Resonant Tunneling Electronic Circuit with Suitable
Resistance Parameters. TELKOMNIKA Indonesian Journal of Electrical Engineering. 2012; 10(6):
1333-1340.
Wang XL, Li N. Study on interharmonics detection method based on windowed interpolation FFT
algorithm. Modern Power. 2012; 29(5): 28-31.
Q Zhang, S Xue. An improved multi-objective particle swarm optimization algorithm. Lecture Notes
in Computer Science. 2007; 4683(1): 372-381.
Gang Li, Xiaofeng Zhao, Dianzhong Wen, Yang Yu. Research on Silicon-based Planar Spiral
Inductance Coil Based on Microelectromechanical System. TELKOMNIKA (Telecommunication
Computing Electronics and Control). 2015; 13(4): 1127-1132.
Mistry DP, Trivedi KR. Development of Online Environmental Monitoring System with Location
Awareness. Bulletin of Electrical Engineering and Informatics. 2012; 1(2): 123-130.
Aluvalu R K, Kamliya V, Muddana L. HASBE access control model with Secure Key Distribution and
Efficient Domain Hierarchy for cloud computing. International Journal of Electrical and Computer
Engineering (IJECE). 2016; 6(2): 770-777.
TELKOMNIKA Vol. 14, No. 3A, September 2016 : 92 – 97