control over power line prepared by :- ra’fat ghanem mostafa atrash yahya hamarshi supervisor :-...
TRANSCRIPT
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Control over power linePrepared by :- Ra’fat Ghanem Mostafa Atrash Yahya HamarshiSupervisor :- Dr. Samer Mayaleh
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ContentIntroduction.What is our project?Human interface.Project concept and design.MCU’s and programming.Problems and recommendations.
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Introduction :
What is PLC? it’s a method using the power line to transfer data
over it
Objective of PLC It’s a telecommunication system use the existing
power network to transfer data over it .
The aim of our project To control devices using the PLC telecommunication
system
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Block Diagram
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Human interface
C# interface Flow chart
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Video
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Coupling circuit - It’s used to inject the message over the power signal.
It construct from: 1- coupling transformer to inject the modulated message over power signal. 2- high pass filter to filter the message from the power signal. 3- low pass filter to filter the message from the harmonics of the modulated frequency.
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LPF
HPF
LPF
PA
Power line
L1 N
Tx
Rx
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PCB Coupling cct
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FSK transceiver This part is implemented by FSK st7540 and use to modulate the out coming signal and demodulate the incoming signal.
It support 8 programmable frequency (132.5KHz) baud rate up to 4800bps (2400bps) the operating frequency F(“0”)= Fcarrier +∆F/2 =131836Hz F(“1”)= Fcarrier - ∆F/2 =133138Hz
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FSK Block diagram
Serial interface
modulator
demodulator
PA
RxD
TxD Tx-out
Rx-in
PA-out
Reg/Data RxTx
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PCB FSK cct
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FSK can access in tow modes2- Control access mode access in synchronous mode only construct from 24 bit programmed serially
1- Data access mode Synchronous data access Asynchronous data access
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Transmuted received and modulated data
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Transmitter MCU
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Receiver MCU
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PCB MCU cct
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Controlling motor by PWMDerived by H-bridge Controlled by MCU over PL’s.
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Additional tipscreating a network using can system o this system use can bus to exchange data between units.o this system use data link layer which consists from arbitration control and data field.o give each unit an IDo when two nodes are send at the same time the node that
win the arbitration send its data over the bus.o this system use the SPI protocol to communicate with
MCU o SPI test between two MCU will succeed
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Problems and suggestions
No SPI response between can system and MCU Try to use another MCU instead of PIC16 that
support can system as PIC18Fxxx, or PIC18Cxxx.
The difficulty to obtain hardware components o Make sure that all project components are available in the local market.o Make sure you have backup.
The difficulty to deal with the mounted service components as FSK.
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Thanks for your attention
Any question ?