JP2004228822A - Electric lamp line transport apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an AC line filter which satisfies the request of thinning an electric lamp line transport apparatus and eliminates and blocks noise, and its connection method. <P>SOLUTION: The electric lamp line transport apparatus is provided with an AC line filter which is a low band filter for which a 4-terminal circuit network is constituted of four pieces of L and one piece of C, each of one end of L1 and L2 is turned to an input end, each of one end of L3 and L4 is turned to an output end, the other ends of L1 and L3 are connected to each other, the other ends of L2 and L4 are connected to each other and C1 is inserted and connected between the connection point of L1 and L3 and the connection point of L2 and L4. L1 and L3 are disposed perpendicularly, L2 and L4 are disposed perpendicularly, L1 and L2 are disposed parallel and L3 and L4 are disposed parallel. C1 is disposed at the clearance between L3 and the L4. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power line conveying device for realizing a thin type.
[0002]
2. Description of the Related Art In recent years, the development and spread of information and communication technology has been remarkable. Particularly, in order to simplify and improve the efficiency of communication services in homes and factories, a method for transmitting communication signals using a power line has been adopted. A home network that transmits a communication signal by using a power line (low-voltage distribution line) already wired to an office or a home by bypassing a power distribution transformer has attracted attention.
Since the home network uses a power outlet provided in the home as a network line, a power line carrier used in the home network, such as a modem, transmits a high-frequency signal as a communication signal propagating through the power line to a power line carrier. Means for injection, extraction and filtering of the AC power line are important.
However, in order to reduce the thickness and increase the efficiency of the power line transport device, the power supply circuit for driving the power line transport device is changed from a conventional linear system to a DC stabilized power source by a switching system, a so-called switching power circuit. However, the switching power supply circuit itself, which receives power supply from the commercial power supply and performs switching control of large power, becomes a noise source and conducts and emits noise to the AC power supply line. It has the disadvantage of radiating noise directly into the air.
[0004] For example, FIG. 3 is a block diagram of a power input unit of a conventional light line carrier, FIG. 4 is a circuit diagram of a known AC line filter, and FIG. 5 is a layout perspective view of electronic parts constituting the AC line filter. Things.
The power supply input unit 31 of the power line transport device includes a well-known switching power supply circuit 4 that supplies power for driving the power line transport device main unit 9 having the power input unit 31 and the injection and extraction of a high-frequency signal propagating through the power line. A known high-frequency circuit 3 (hereinafter, referred to as an “RF circuit”) and a known AC line filter 12 are provided. The switching power supply circuit 4, the RF circuit 3, and the AC line filter 12 are connected to a printed wiring board 15. It is arranged in.
As a countermeasure against the conduction emission of noise components through the AC power supply line, the AC line filter 12 is connected between the switching power supply circuit 4 and the RF circuit 3, that is, at the AC input stage. Removes input feedback noise.
The AC line filter 12 is, as shown in FIG.
A coil L1 and a coil L3 arranged on a LIVE line of an AC power supply line;
A coil L2 and a coil L4 arranged on the NEUTRAL line of the AC power supply line, and a capacitor C1 forming a four-terminal network,
One end of L1 and L2 is an input end, one end of L3 and L4 is an output end, the other ends of L1 and L3 are connected, the other ends of L2 and L4 are connected, and the connections of L1 and L3 are connected. C1 is inserted and connected between the point, L2 and L4 and the connection point.
As a measure against noise components radiated directly from the switching power supply circuit 4 into the air, a shield case (not shown) surrounding the switching power supply circuit 4 or the RF circuit 3 is provided. Alternatively, by arranging the switching power supply circuit 4 and the RF circuit 3 apart from each other, radiation noise from the switching power supply circuit 4 is prevented.
[0007]
[Problems to be solved by the invention]
By providing the switching power supply circuit 4 and the RF circuit 3 in the vicinity and arranging the switching power supply circuit 4 and the RF circuit 3 in parallel in order to reduce the area of the printed wiring board 15, The phenomenon that noise radiated in the vertical direction of the printed wiring board 15 of the switching power supply circuit 4 occurred on the wiring pattern of the printed wiring board 15 connected to the input side of the circuit occurred.
Further, in order to suppress the mounting area of the printed wiring board 15 by the AC line filter 12, as shown in FIG. 5, the coils, for example, the drum-shaped coils L1 to L4 and the capacitor C1 are densely mounted on the printed wiring board 15. However, since the coils L1 to L4 are connected to each other, the shield case cannot be provided in order to satisfy the demand for thinning of the power line carrier.
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides an AC line filter which satisfies the demand for thinning of a power line carrier and eliminates and blocks noise and a method of connecting the same. The purpose is to:
[0009]
Means for Solving the Problems To solve the above problems, the invention according to claim 1 according to the present invention,
A switching power supply circuit,
An AC line filter connected in series to an input stage of the switching power supply circuit;
A coupler circuit connected in series to an input stage of the AC line filter;
A power input unit comprising: the RF circuit connected in parallel with the AC line filter via the coupler circuit; and a printed wiring board 5 on which at least electronic components constituting the circuit are arranged in a plane. A power line transport device having
The AC line filter comprises a four-terminal network formed by four Ls and one C.
One end of L1 and L2 is an input terminal, one end of L3 and L4 is an output terminal, the other ends of L1 and L3 are connected, the other ends of L2 and L4 are connected, and the connections of L1 and L3 are connected. A low-pass filter in which C1 is inserted and connected between a point, L2 and L4, and a connection point;
The L1 and the L3 are disposed at a right angle, the L2 and the L4 are disposed at a right angle, and the L1 and the L2 are disposed in parallel, and the L3 and the L4 are disposed in parallel;
The C1 is provided in a gap between the L3 and the L4.
According to a second aspect of the present invention, in the first aspect, the L1 to L4 are disposed such that a direction of a magnetic field generated by the coil is parallel to the printed wiring board. .
According to a third aspect of the present invention, in the second aspect, a substantially rectangular magnetic field induction plate is erected in the gap between C1 and L3 and in the gap between C1 and L4. Features.
According to a fourth aspect of the present invention, in any one of the first to third aspects, the coupler circuit and the RF circuit are electrically connected by a twisted pair wire.
According to a fourth aspect of the present invention, in any one of the first to fourth aspects,
An AC line connecting a commercial power supply and the coupler circuit,
An AC line connecting the coupler circuit and the AC line filter;
A twisted pair wire is used for an AC line connecting the AC line filter and the switching power supply circuit.
[0014]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on the illustrated embodiments of the present invention.
FIG. 1 is a configuration diagram of a power input unit of a power line carrier according to an embodiment of the present invention, and FIG. 2 schematically shows an arrangement of electronic components constituting an AC line filter. 2 is a top view, FIG. 2B is a perspective view thereof, and FIG. 4 is a circuit diagram of an AC line filter.
The switching power supply circuit 4, an AC line filter 2 connected in series to an input stage of the switching power supply circuit 4, a coupler circuit 6 connected in series to an input stage of the AC line filter 2, and The power input unit 1 includes the RF circuit 3 connected in parallel with the AC line filter 2 and a printed wiring board 5 on which at least electronic components constituting the known circuit are arranged in a plane. ,
The input side of the power supply input unit 1, that is, the input stage of the coupler circuit 6, is connected to a commercial power supply, and the output side of the power supply input unit 1 is supplied with the output of the switching power supply circuit 4 and exchanges signals with the RF circuit 3. Connected to the main unit 9 of the power line transport device.
The AC line filter 2 includes core type drum type (solenoid type) coils L1 to L4 (hereinafter referred to as "coils") and a capacitor C1.
A coil L1 and a coil L3 arranged on a LIVE line of an AC power supply line;
A coil L2 and a coil L4 arranged on the NEUTRAL line of the AC power supply line, and a capacitor C1 forming a four-terminal network,
One end of L1 and L2 is an input end, one end of L3 and L4 is an output end, the other ends of L1 and L3 are connected, the other ends of L2 and L4 are connected, and the connections of L1 and L3 are connected. C1 is inserted and connected between the point, L2 and L4 and the connection point.
The direction of the magnetic field generated by the coil is defined as the longitudinal direction of the coil, and the arrangement of the coils L1 to L4 and the capacitor C1 is as follows.
The coil L3 and the coil 4 are provided at a desired distance from each other, and are disposed horizontally at positions where the longitudinal directions of the coil L3 and the coil 4 are parallel and the longitudinal directions of the coil L3 and the coil 4 are line-symmetric. A capacitor C1 is disposed on the axis of symmetry between the coil L3 and the coil L4 and obliquely to the coil L3, and the coil L2 extends in the direction in which the capacitor C1 is disposed and by the axis of symmetry. The coil L1 is horizontally disposed at a position where the direction is vertically divided into two, and the coil L1 and the coil L2 are arranged such that their longitudinal directions are parallel to each other and between the coil L2, the coil 3, and the capacitor C1. Set up.
Further, as a countermeasure against a noise component radiated directly into the air from the switching power supply circuit 4,
A substantially rectangular magnetic field induction plate 7b extending between the capacitor C1 and the coil L3 in parallel with the longitudinal direction of the coil L3 and extending between the capacitor C1 and the coil L1. It is desirable that a magnetic field guide plate 7a having substantially the same size as the magnetic field guide plate 7b be provided between the capacitor C1 and the coil 4 so as to be line-symmetric with the magnetic field guide plate 7b. The magnetic field guide plates 7a and 7b are preferably made of a metal plate such as a copper plate having a high dielectric constant.
The connection between the coupler circuit 6 and the RF circuit 3 uses a twisted pair wire 8 for removing noise due to electromagnetic induction.
Although the present invention has been described above using the core type drum-shaped coil, the present invention is not limited to the core type drum-shaped coil, but includes air core drum type coil, honeycomb type, toroidal type and the like. It goes without saying that the present invention can be applied to a coil.
The magnetic field induction plates 7a and 7b can be applied not only to metal plates but also to metal-plated resin plates.
In order to remove noise due to electromagnetic induction, it is desirable to use a twisted pair wire for the AC line.
The power input unit 1 may be built in the power line carrier unit 9 or the power input unit 1 may be a single unit, for example, the input side of the power input unit 1, that is, the input of the coupler circuit 6. A power supply cable may be connected to the stage, and an output side of the power input unit 1 may be connected to a connector for output of the switching power supply circuit 4 and a connector for input / output signals to / from the RF circuit 3.
With this configuration, it is possible to provide an AC line filter that satisfies the demand for thinning of the power line carrier and that removes and blocks noise and a method of connecting the same.
[0025]
According to the first and second aspects of the present invention, the frequency characteristics of the AC line filter are stable over a wide band, and the spacing between the coils can be reduced, so that the mounting area can be reduced.
According to the third aspect of the invention, there is an effect that the magnetic field interference between the coils can be suppressed.
According to the fourth and fifth aspects of the present invention, the direction of the magnetic field and the current flowing through the twisted pair wire are inverted for each twisted section of the twisted pair wire, so that electromagnetic induction is reduced.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a power input unit of a power line carrier as an embodiment of the present invention.
FIG. 2 is a schematic view of an arrangement of electronic components constituting an AC line filter according to the embodiment of the present invention.
(A) Top view. (B) Perspective view.
FIG. 3 is a block diagram of a power input unit of a conventional power line carrier.
FIG. 4 is a circuit diagram of a known AC line filter of a power input unit.
FIG. 5 is an arrangement perspective view of electronic components constituting a conventional AC line filter.
[Explanation of symbols]
1, 31 Power supply input unit 2, 12 AC line filter 3 RF circuit 4 Switching power supply circuit 5, 15 Printed circuit board 6 Coupler circuit 7a, 7b Magnetic field induction plate 8 Twisted pair wire 9 Electric light line carrier Drum type coil containing core material C1 ... Capacitor

Claims (5)

A switching power supply circuit,
An AC line filter connected in series to an input stage of the switching power supply circuit;
A coupler circuit connected in series to an input stage of the AC line filter;
A power line having a power input unit comprising: the RF circuit connected in parallel with the AC line filter via the coupler circuit; and a printed wiring board on which at least electronic components constituting the circuit are arranged. A transport device,
The AC line filter comprises a four-terminal network formed by four Ls and one C.
One end of L1 and L2 is an input terminal, one end of L3 and L4 is an output terminal, the other ends of L1 and L3 are connected, the other ends of L2 and L4 are connected, and the connections of L1 and L3 are connected. A low-pass filter in which C1 is inserted and connected between a point, L2 and L4, and a connection point;
The L1 and the L3 are disposed at a right angle, the L2 and the L4 are disposed at a right angle, and the L1 and the L2 are disposed in parallel, and the L3 and the L4 are disposed in parallel;
The power line transport device, wherein the C1 is disposed in a gap between the L3 and the L4. 2. The power line transport device according to claim 1, wherein the L1 to L4 are arranged such that a direction of a magnetic field generated by the coil is parallel to the printed wiring board. 3. The power line transport device according to claim 2, wherein substantially rectangular magnetic field guide plates are erected in a gap between the C1 and the L3 and in a gap between the C1 and the L4. The light line carrier according to any one of claims 1 to 3, wherein the coupler circuit and the RF circuit are electrically connected by a twisted pair wire. An AC line connecting a commercial power supply and the coupler circuit,
An AC line connecting the coupler circuit and the AC line filter;
An AC line connecting the AC line filter and the switching power supply circuit;
The power line transport device according to any one of claims 1 to 4, wherein a twisted pair wire is used.

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