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JP2000151479

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2000151479
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
improvement of a feed line superimposed communication device for a mobile unit, in which
signals can be superimposed on a feed line for supplying power to the mobile unit and a stable
signal can be received from the mobile unit. is there.
[0002]
2. Description of the Related Art In a conventional feed line superimposed communication
apparatus for a mobile unit, a feed line wired along a traveling rail is connected to a power
supply unit grounded on the ground side, and the ground side moves to the traveling rail A fixed
transmitter is provided which gives commands to the possibly provided mobiles.
[0003]
The operation of the conventional feed line superimposed communication apparatus for a mobile
unit will be described below.
A harmonic current is supplied from the power supply to the feeder line to drive the mobile. The
signal transmission unit superimposes the transmission signal from the transmission coil via the
modulator on the harmonic current flowing through the feeder and transmits it.
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[0004]
When the mobile receives the transmission signal superimposed on the feed line by the receiving
coil, the signal reception circuit receives the command signal. In addition, the power supplied by
the feeding coil is supplied to the load.
[0005]
However, the following problems can be considered in the communication apparatus for
communication with a feeder of the mobile unit. First, when a low level signal power is
superimposed on the feed line, the power current flows into the signal transmission unit by the
magnetic coupling of the transmission coil, affecting the flow of the signal current from the
signal transmission unit. There is a problem that the transmission function is degraded.
[0006]
Second, in general, the carrier frequency of the feeder is about 10 KHz. Therefore, it is preferable
to set the signal frequency to several MHz or more, because it is better to separate the power
frequency and the signal frequency in order to separate the power and extract the signal in the
mobile object. However, when the frequency is set to several MHz or more, the skin effect of the
feeder leads to a very high signal impedance, which makes it difficult to transmit signal power.
Therefore, since the signal frequency is set to about 100 to 300 KHz, the S / N ratio in the
receiving unit is deteriorated in the configuration of the feed line superposition communication
device, and there is a problem that the power is large and the device becomes large. .
[0007]
The present invention has been made to solve the above-mentioned problems, and it is possible
to provide a feed line superimposing communication device for a mobile unit which can stably
transmit a signal and has a high S / N ratio of a signal circuit and low power. It is.
[0008]
According to a first aspect of the present invention, there is provided a feed line superimposed
communication device for a moving body according to a first aspect of the present invention,
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which is provided along a traveling rail for moving the moving body and supplies a current to the
moving body. A power generation means for generating AC power at a first frequency supplied to
the mobile body, a filter means for filtering a specific frequency of a voltage of the power
generation means, and causing a current to flow through the feed line; Power receiving means
for receiving power from the feeder line by electromagnetic induction, signal generating means
for generating a signal voltage of a second frequency higher than the first frequency, and the
signal voltage of the signal generating means A transmission electromagnetic coupling means for
causing the current flowing in the feeder through the transmission capacitor to be superimposed
by electromagnetic induction, and the movable body being provided with electromagnetic
induction from the feeder A signal receiving means for receiving the serial signal current, is
characterized in that it comprises a.
[0009]
The signal receiving means of the feed line superimposed communication device for a mobile
according to the second invention comprises a receiving electromagnetic coupling means for
receiving a signal current by electromagnetic induction, and a receiving capacitor connected in
parallel to the receiving electromagnetic coupling means. The parallel circuit composed of the
receiving electromagnetic coupling means and the receiving capacitor is resonated at
substantially the second signal frequency.
[0010]
Assuming that the capacitance value of the transmission capacitor is C2, the inductance value of
the transmission electromagnetic coupling means is L4, and the second frequency value is f2. It
is characterized in that it has a relationship of (2πf 2) 2 L 4 C 2 の 1.
[0011]
The feed line superimposed communication device for a mobile according to the fourth aspect of
the present invention, the capacitance value of the transmission capacitor is C2, the inductance
value of the transmission electromagnetic coupling means is L4, and the inductance value seen
from the transmission electromagnetic coupling means is Letting LT be the second frequency
value f2, it is characterized by having a relationship of (2πf2) 2 {L4LT / (L4 + LT)} C2 ≒ 1.
[0012]
DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment
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An embodiment of the present invention will be described with reference to FIGS. 1 to 5.
FIG. 1 is an entire configuration diagram of a feed line superimposed communication apparatus
of a mobile unit, and FIG. 2 is a current waveform diagram of the feed line.
In FIG. 1, for example, a reactor 102 for causing a square wave voltage of the inverter 100 to be
a sine wave shown in FIG. 2 at the output of a voltage type inverter 100 as power generation
means for generating a square wave voltage at a first frequency of 10 KHz. An LC filter
consisting of a capacitor 104 is provided.
[0013]
A loop having a length of, for example, 20 to 100 m is formed at both ends of the capacitor 104
by a feeder 106 coated with a copper wire or the like with an insulating material, and the signal
transmission circuit 120 as signal transmission means A mobile body 130 fixedly provided in the
vicinity and movable along the feed line 106 receives and receives power and signals from the
feed line 106 in a contactless manner.
[0014]
The signal transmission circuit 120 is connected to a coil 128 wound around the toroidal core
126 via a transmission capacitor 124 with a signal power (signal generation means) 122 of, for
example, 105 KHz as a second frequency.
In the space portion of the toroidal core 126, the feed line 106 is penetrated to form
transmission electromagnetic coupling means, and the signal current is superimposed on the
power current as shown in FIG. 2 by the electromagnetic induction action. .
[0015]
The mobile unit 130 includes a power receiving unit 140 as a power receiving unit for receiving
power without contact from the power supply line 106, and a signal receiving unit for receiving a
signal from the signal transmission circuit 120 without contact via the power supply line 106. A
signal receiving unit 150 is provided, and the power receiving unit 140 has an E-shaped core
142 made of ferrite, and each recess of the core 144 is inserted with one feed line 106, and the
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center The coil 144 is wound around the projecting portion, and both ends of the coil 144 are
connected to the load 146 and the capacitor 148, whereby an alternating magnetic field
generated by a high frequency current flowing through the feed line 106 is induced to the coil
144 and power frequency The capacitor 146 is configured to resonate in parallel with the
capacitor 148 to supply power to the load 146 contactlessly.
[0016]
The signal receiving unit 150 has a core 152 made of the same shape and material as the core
144 and having a coil 154 wound around a central protrusion, and both ends of the coil 154 are
connected to the signal receiving circuit 156. And electromagnetic coupling means for inducing
an alternating magnetic field generated by a high frequency current flowing through the feed
line 106 to the coil 154 by electromagnetic induction, and the output of the coil 154 is supplied
to the signal reception circuit 156. ing.
[0017]
An electrical equivalent circuit of such a configuration will be described with reference to FIG.
In FIG. 3, L2 is a feeder equivalent coil of the feeder 106, L4 is a transmitter equivalent coil
showing transmission side mutual induction of the transmitting coil 128 and the feeder 106, and
L5 is a power receiver coil 144 and the feeder 106. A power receiving unit side equivalent coil
showing power receiving side mutual induction, L6 is a reception side equivalent coil showing
reception side mutual induction of the signal receiving coil 154 and the feeder 106.
A parallel resonant circuit Pw is formed by the power receiving unit side coil L5 and the
capacitor C3.
[0018]
The equivalent circuit of FIG. 3 is shown in FIG. 4 by an electrical equivalent circuit at the signal
frequency.
The reason for the equivalent circuit of FIG. 4 is that, in FIG. 3, the inverter 100 can be regarded
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as a short circuit because of the voltage type.
For a signal frequency of 105 KHz, the capacitor C1 can be regarded as a short circuit because
the impedance of the capacitor C1 is sufficiently low. The parallel resonant circuit Pw should be
regarded as a short circuit because the parallel resonant circuit Pw resonates at a power
frequency of 10 KHz, so the impedance is sufficiently low.
[0019]
The equivalent circuit of FIG. 3 is shown in FIG. 5 as an electrical equivalent circuit at the power
frequency. The reason why the equivalent circuit of FIG. 5 is obtained is that, in FIG. 3, the
transmitting equivalent coil L4 can be regarded as a short circuit because the impedance to the
power frequency of 10 KHz is low. The transmission capacitor C2 seems to be open because the
transmission capacitor C2 resonates with the transmission equivalent coil L4 at the signal
frequency, so the capacitance is sufficiently low, the impedance is 1 / ωC2, and the power
frequency is It is because impedance becomes high. The reason why the receiving equivalent coil
L6 can be regarded as a short circuit is that the inductance is sufficiently small and the
impedance is very small at the power frequency. In FIG. 5, the resistor RL is an equivalent
resistance of the load 146.
[0020]
Therefore, since the transmission equivalent coil L4 can be regarded as a short circuit and the
transmission capacitor C2 can be regarded as an open circuit from the electrical equivalent
circuit of FIG. 5, the power current Iw flows into the signal power supply 122 of the signal
transmission circuit 120 very little. It will be.
[0021]
Next, the validity of the electrical equivalent circuit of FIG. 4 and FIG. 5 is confirmed by
substituting numerical values into the inductance of each coil and the capacitance of each
capacitor.
In FIG. 3, when the inductance of the coil L1 is 20 μH and the capacitance of the capacitor C1
resonates the coil L1 and the capacitor C1 at a power supply frequency of 10 KHz, the resonance
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frequency fr = 1 / {2π (L1C1) of a known LC series circuit. It becomes 12.7 μF from 1/2}. For
example, when the length of the feed line equivalent coil L2 is 50 m, the measured value is 50
μH, and the inductance of the transmission equivalent coil L4 and the reception equivalent coil
L6 is about 3 μH each.
[0022]
When the capacitance of the transmission capacitor C2 resonates the transmission equivalent
coil L4 and the transmission capacitor C2 at a signal frequency of 105 KHz, the resonance
frequency fr = 1 / {2π (L4C2) 1/2} of a known LC series circuit This is 0.77 μF. The power
receiving side equivalent coil L5 is measured by 100 μH in actual measurement, and when the
power receiving side equivalent coil L5 and the capacitor C3 are resonated at a power frequency
of 10 KHz, the resonance frequency fr = 1 / {2π It becomes 2.5 μF from 1 / L5C3-R2 / L52)
1/2}.
[0023]
Next, each impedance at a signal frequency of 105 KHz, that is, | ZRi | of parallel resonant circuit
Pi of capacitor C1 and coil L1, | Zw | of power receiving side parallel circuit Pw, | ZL2 | of feeder
equivalent coil L2 is calculated. . | ZRi | = | ωL1 / (1−ω2L1C1) | = 0.12 Ω (1) | Zw | = | ωL5 /
(1−ω2L5C3) | = 0.61 Ω (2) | ZL2 | = ωL2 = 33 Ω (3)
[0024]
Therefore, since the impedances of the parallel resonant circuit Pi and the power receiving side
parallel circuit Pw are extremely lower than the impedance of the feeder equivalent coil, the
parallel resonant circuit Pi and the power receiving side parallel circuit Pw can be regarded as a
short circuit.
[0025]
Next, each impedance | Z | at the power frequency, that is, | ZL2 | of the feeder equivalent coil
L2, | ZL4 | of the transmission equivalent coil L4, | ZL6 | of the reception equivalent coil L6, |
ZC2 of the transmission capacitor C2. Calculate |.
[0026]
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| ZL2 | = ωL2 = 3.1Ω (10) | ZL4 | = | ZL6 | = ωL4 = ωL6 = 0.188 Ω .. (11) | ZC2 | = | 1 / ω C 2
| = 20 Ω (12)
[0027]
Therefore, since the impedance of the transmission equivalent coil L4 can be ignored with
respect to the impedance of the feeder equivalent coil L2, the circuit of the transmission
equivalent coil L4 can be regarded as a short circuit.
Since the impedance of the transmission capacitor C2 is extremely large compared to the
impedance of the transmission equivalent coil L4, it can be regarded as release.
[0028]
Further, in FIG. 1, a receiving capacitor 200 is connected in parallel to the input portion of the
signal receiving circuit 156, and the receiving capacitor 200 forms a parallel circuit with the
receiving equivalent coil L6 to resonate by the signal frequency. With this configuration, since
the reception level of the signal reception circuit 156 is increased, it is possible to transmit and
receive signals with higher reliability.
[0029]
Second Embodiment
Another embodiment of the present invention will be described with reference to FIG.
In FIG. 4, the transmission capacitor C2 and the transmission equivalent coil L4 are configured to
transmit the frequency fr = 1 / {2π (L4C2) 1/2} at the signal frequency.
According to this configuration, the current I3 at the signal frequency flowing through the feed
line 106 is irrelevant to the inductances of the feed line equivalent coil L2 and the reception side
equivalent coil L6. The reason is described below.
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[0030]
In FIG. 4, the signal current I3 is as follows. I3 = I1 × Z2 / (Z2 + Z3) (20) where I1 = E / Z0, Z2 =
jωL4, Z3 = jω (L2 + L6) Z0 = (1) Assuming that the relationship of / jωC2) + {(-ω2L4LT / (Z2 +
Z3)) (21) (2πf2) 2L4C211, then I3 = E / (jωC2). ... (22)
[0031]
Therefore, according to the equation (22), the signal current I3 flowing through the feed line 106
is a constant current determined only by the voltage E of the signal power and the signal
frequency and the capacitance of the transmission capacitor C2, and the impedance seen from
the signal circuit And a large signal current can be superimposed on the feed line 106 even at a
low level signal voltage value regardless of the impedance of the feed line 106, so that a compact
and highly reliable signal reception circuit can be obtained. Can.
[0032]
Also, the capacitance value of the transmission capacitor is C2, the inductance value of the
transmission electromagnetic coupling means is L4, and the inductance value seen from the
transmission electromagnetic coupling means, that is, for example, the inductance value of the
feeder equivalent coil, the power receiving side Assuming that the sum of the equivalent coil L5
and so on is LT and the second frequency value is f2, the impedance viewed from the signal
power source is configured to have a relationship of (2πf2) 2 {L4LT / (L4 + LT)} C2 ≒ 1. Can
transmit a signal at a very low voltage, and the signal current can be efficiently superimposed on
the feed line 106.
[0033]
The power frequency is set to 10 KHz and the signal frequency is set to 105 KHz, for the
following reasons.
First, if the signal frequency is 10 times or more the power frequency, it is possible to sufficiently
separate the signal wave superimposed on the power by a filter or the like.
Second, the signal frequency is not set to be an integral multiple of the power frequency because
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harmonic components that are integral multiples of the power frequency flow to the feed line
106, so as to prevent a match with the signal frequency.
[0034]
According to the first aspect of the present invention, the feed line is provided along the traveling
rail for moving the moving body and supplies a current to the moving body, and the first
frequency supplied to the moving body Power supply means for generating AC power, filter
means for filtering a specific frequency of the voltage of the power generation means, and
supplying current to the feed line, and provided on the movable body, and electromagnetic
induction from the feed line Power receiving means for receiving power, signal generating means
for generating a signal voltage of a second frequency higher than the first frequency, and the
signal voltage of the signal generating means are transmitted to the feeder through the
transmission capacitor. It comprises: electromagnetic coupling means for transmission to be
superimposed on the flowing current by electromagnetic induction; and signal receiving means
provided on the moving body and receiving the signal current from the feeder line by
electromagnetic induction. As a result, the signal can be stably transmitted from the signal
generation means through the feed line, and the S / N ratio of the mobile object is high, and the
power of the signal generation means may be small.
[0035]
According to the second invention, in addition to the effect of the first invention, the signal
receiving means is a receiving electromagnetic coupling means for receiving the signal current
by electromagnetic induction and a receiving parallelly connected to the receiving
electromagnetic coupling means. Since the parallel circuit comprising the capacitor and the
receiving electromagnetic coupling means and the receiving capacitor is resonated at
substantially the second signal frequency, the parallel circuit comprising the receiving
electromagnetic coupling means and the receiving capacitor is obtained. Since the resonance is
performed substantially at the second signal frequency, the level of the reception voltage value of
the signal transmitted through the feeder can be increased.
[0036]
According to the third invention, in addition to the effects of the first or second invention, the
capacitance value of the transmission capacitor is C2, the inductance value of the transmission
electromagnetic coupling means is L4, and the second frequency value is f2. Then, the
relationship of (2πf 2) 2 L 4 C 2 1 1 is established, so that the power current from the power
generation means is less likely to flow into the signal generation means via the transmission
electromagnetic coupling means.
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[0037]
According to the fourth invention, in addition to the effects of the first or second invention, the
capacitance value of the transmission capacitor is C2, the inductance value of the transmission
electromagnetic coupling means is L4, and the transmission electromagnetic coupling means
Assuming that the inductance value is LT and the second frequency value is f2, the relation of
(2πf2) 2 {L4LT / (L4 + LT)} C2 ≒ 1 is established, so that the voltage generated from the signal
generation means is small. Since a large signal current can be superimposed on the feed line, the
level of the reception voltage value of the signal transmitted through the feed line can be
increased.
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