JPS5829647Y2 - guided wireless communication device - Google Patents

Description

[Detailed description of the invention] This invention relates to an inductive wireless communication device, in particular, an on-board coupling coil is provided on the roof of a vehicle in a symmetrical position with respect to the overhead contact line, and is connected to an on-board transmitting/receiving device. But 2 in 1
Two pairs of guide wires are provided, each arranged symmetrically with respect to the overhead contact line, and these four guide wires are connected in series to a ground transceiver.

First, the present device will be described with reference to the embodiments shown in the figures. FIG. 1 is a schematic layout diagram of the present device, and FIG. 2 is a circuit connection diagram thereof.

In the figure, 1 is a vehicle, which has two sides 2a and 2c symmetrically with respect to the central axis A-A' on its roof, and two other sides 2b and 2.
A rectangular on-vehicle coupling coil 2 with four sides 2a2b-2c2d including d connected in series is installed, and both ends are connected to an on-vehicle transmitter/receiver 3.
Connect to.

Of course, the other side 2 of the coupling coil 2 should not spread external noise.
It is also possible to make b and 2d parallel.

Reference numeral 6 denotes an overhead contact line, which is arranged in the direction of travel and aligned with the central axis AA', and is electrically and mechanically connected to the electrical equipment on the train using a panda graph.

On the other hand, on the ground, a pair of guide wires 4a and 4b, sc
and 4d are provided, and as a result, between the terminals of the guide wires 4a and 4b, 4c and 4d, which are equally spaced, equal resistors 5a and 5b are connected as termination regulators, and a connecting wire 4e connecting the guide wires 4b and 46, Connect wires 4a and 40 with wires 4f, 4
A ground transceiver γ is provided which connects via g.

Next, the operation of the present device will be explained. Assuming that guided wireless communication is performed from the vehicle to the ground using an induced magnetic field, 3 is a transmitter and 7 is a receiver.

Considering the case where the high-frequency induced signal current 11 from the transmitter 3 flows in the direction of the solid arrow in the coupled coil sides 2a and 2c,
The induced magnetic field generated by this high-frequency induced current 11 causes the guiding wires 4a and 4b and 4c and 4d to move in the direction of the solid arrows I2. ■ An induced signal current of '2 flows.

Therefore, the coupling coil sides 2a and 20 and the guide wires 4a, 4
Since b, 4c, and 4dI/i are all symmetrical, ■22■'2, and for the transmitter 3's transmission current 11, the receiver 7 receives a received signal current as I/'iI2+■'2=2I2. A train current I01 flows between the contact line 6 and the ground to drive the vehicle, and this train current is also connected to the pair of guide wires 4a and 4 by the naturally induced magnetic field.
In b, an induced current I'02 is generated in the direction of the dotted arrow in the IO21 pair of induction wires 4c and 4d.

In other words, one pair of guide wires 4a for each overhead contact line 6,
4b and 4c.

4d is left-right symmetrical, the phases are reversed by 180 degrees when I = I', canceling each other out and having no effect on the receiver 7.

Furthermore, due to the train current ■o□, the sides 2a and 2 of the on-board coupling coil 2
The induced current l03tI'03 will also flow in c, but since this is also left-right symmetrical with respect to the overhead contact line 6, ■o3
=■'o3, the phase is 180° reversed and cancelled, transmitter 3
will not affect.

The above-mentioned train current I01 includes noise generated when the panmegraph is separated from the track, substation noise, or recently, harmonic components caused by the thyristor chopper, etc., which adversely affects the signal current l2tI2 necessary for inductive wireless communication, and the signal-to-noise ratio ( S
/N), which caused problems for engineers in designing and manufacturing, but in one proposed device, the transmitter and receiver are each provided with guiding wires and coupling coils arranged symmetrically with the overhead contact line as the central axis. By this, the above-mentioned induced current I02
and■'o2 In addition to the noise being automatically removed due to the canceling action of Work03 and I'03, Work.

Since +■5=2I2, the received signal current increases by twice, or 3 dB, compared to the normal one-sided pair of inductive wire type, and the signal-to-noise ratio described above is further improved.

In the above embodiment, the case where guided wireless communication is performed from on-vehicle to the ground has been explained, but communication from the ground to on-vehicle is also reversible in the same way, and in this case, 7 is the transmitter,
3 becomes the receiver.

In the embodiment shown, the coupling coil 2 is a rectangular coil that is symmetrical to the overhead contact line 6, but it may be round as long as it is symmetrical, or it may be divided into two coils, each of which is symmetrical to the overhead contact line 6. It is no longer the case that the same effect can be obtained by arranging the polarity so that the polarity is the same and connecting the two in series with the same polarity.

[Brief explanation of drawings]

FIG. 1 is a schematic layout diagram of an embodiment of the present device, and FIG. 2 is a circuit connection diagram thereof. In the figure, 1 is a vehicle, 2 is an on-vehicle coupling coil, and 2a. 2b, 2c, 2d, 4a, 4b, 4c, 4d are guide wires,
3 is the transmitter/receiver on the vehicle, and 7 is the transmitter/receiver on the ground.

Claims (1)

[Scope of utility model registration request] An on-board coupling coil is provided on the roof of the vehicle in a symmetrical position relative to the overhead contact line and connected to the on-board transmitter/receiver, while two pairs of guide wires are provided on the ground as well, and each of the above-mentioned A guided radio communication device that is arranged symmetrically with respect to the overhead contact line, and these four guide wires are connected in series to a ground transmitter/receiver.