Design of Broadband Coupling Circuits For Power
Design of Broadband Coupling Circuits For Power
Design of Broadband Coupling Circuits For Power
COMMUNICATION
Zohaib Hassan
Electrical Engineering Department
Superior University Lahore
Abstract
Any system power line communication (PLC),
one of the most critical elements of an interface
circuit (or coupling circuit) is connected to the
distribution network. This is not a single entity in
view of difficulties in the PLC channel
characteristics. Due to the high voltage must be
carefully designed in a different impedance, high
backs and time-dependent diseases, coupling
circuitry to provide a specific signal transmission
to the appropriate bandwidth and security level of
the national or international standards applicable
required. This article describes the various issues
relating to the coupling circuit design practice. We
investigated the inductive coupling, capacitive
coupling as well as some hybrid designs.
Measuring connection circuit of our proposed for
the transport operations of the power line noise
and PLC channel measurements and charge of the
practice. We have demonstrated the effects of
coupling circuit measurements, and show how to
measure the impact of the power line actual
scattering parameter compensation. We compare
and various designs coupled circuit to determine if
they are applicable to the actual power line
communication system comment.
I.
INTRODUCTION
Waveform signal coverage in the PLC means
coupling circuits and power supply circuits and
interfaces should be carefully designed for
optimum compatibility between the two systems.
Electricity and communications systems work at
both ends - power system in the trend a very low
frequency and very high power, electrical, and at
higher levels of frequency and communication
systems and very low power, current and voltage
levels To be able to design a PLC system, and to
provide appropriate interfaces between power
supply and communication system coupling
circuits must be clearly understood. Coupled
communication signals to P LC channel can be
III.
COUPLING CIRCUITEXAMPLE
A typical coupling circuit usually two coupling
capacitors and coupling transformers. Fig. 1 shows
a circuit diagram of a broadband coupling circuit
designed for our PLC channel measurements. The
circuit uses a high voltage capacitor to filter high
voltage 50/60 Hz waveform, a wideband
transformer,
combination
of
over-voltage
protection diode.
coupling circuit of Fig.1.
Figure-3. Attenuation in the 20 m power cable
[1]
b) a)Figure-6. Frequency response of the ferrite
Figure-7. Inductive coupling schemes
[2]
[3]
[4]
[5]
[6]
[7]
V.
REFERENCES
H. Ferreira, H. Grove, O. Hooijen and A.
Vinck, Power line Communications: An
Overview, Africon 1996, Stellenbosch, pp.
558-563.
Walter Hagmann, Installation and Net
Conditioning Manuel for Power line
Infrastructure Unit, Ascom Power line, pp. 813, 2000.
Petrus A.J.V.Rensburg and H.C. Ferreira,
Coupling Circuiterie: Under standing the
Functions of Different Components,Proc.of
7th ISPLC-2003,Kyoto, Japan, pp. 204-209,
March 26-28,2003.
Petrus A. J. V. Rensburg and H. C. Ferreira,
Practical Aspects of Component Slection
and Circuit Lay-out for Modem and Coupling
Circuitry, Proc. of 7th ISPLC-2003, Kyoto,
Japan, pp. 197-203, March 26-28, 2003.
IEEE Guide for Power-Line Carrier
Applications, IEEE Standard 643-1980.
H. K Podszeck, Carrier Communication
over Power Line, 4th Edition, New York:
Spinger-Verlag, 1972.
ANSI C93.1-1972, Rquipements for Power
Line
Coupling
Capacitors.Different
Components, Proc. of 7th ISPLC-2003,