JP7349374B2 - Track circuit transmitter - Google Patents

Description

The present application relates to a transmitter for a track circuit.

The ATC (Automatic Train Control) system, which aims to ensure safe train operation, uses a track circuit containing two rails as a medium to send train detection signals (TD signals) to trains running on the rails. A train is detected by transmitting a signal, and a train control signal (ATC signal) is transmitted to perform train control.

In train detection control, a TD signal is transmitted between a transmitter and a receiver placed on the ground, and the signal voltage input to the receiver is determined when the rail is short-circuited by the axle when the train enters the relevant section. It is determined that a train is on the line when the signal voltage decreases, and when a train is not on the line, it is determined that a train is not on the line when the signal voltage is equal to or higher than a predetermined value. In addition, in train control, an ATC signal is transmitted from a transmitter placed on the ground to the track circuit, and when a train enters the relevant section, a short-circuit current flows through the axle, and a power receiver (antenna) receives the short-circuit current by electromagnetic induction. The signal is converted into a voltage and input to a receiver installed in the vehicle, the signal is demodulated, the information is analyzed, and predetermined controls (speed limit, brake output, etc.) are performed according to the information.

For this reason, the electrical characteristics required for the TD signal and the ATC signal are different. That is, for the TD signal, it is necessary to make the ratio of power applied to a receiver placed on the ground as large as possible between when a train is not on the line and when a train is on the line. Therefore, it is desirable that the TD signal power supplied from the transmitter be the highest when the train is not on the line, and be the lowest when the train is not on the line. On the other hand, the ATC signal is output from the transmitter when the train is on the line, so it is necessary to make the current flowing through the axle as large as possible. Generally, the minimum current value in the event of an axle short circuit is specified for each route.

Here, the track circuit including the rail becomes a load on the transmitter placed on the ground, but the impedance is not constant depending on the rail length, connected cable length, weather, etc., and if you also include trains on the track and off the track. , the range of variation ranges from several times to several tens of times. Under such conditions, special control is required of the transmitter in order to provide stable signal levels for both the TD signal and the ATC signal.

For example, Patent Document 1 discloses that the output current and voltage of the amplifier section of a transmitter that outputs a signal to a track circuit are measured, the load impedance is calculated at an arbitrary timing from both values, and the load impedance and the apparent appearance of the transmitter are calculated. A method is disclosed for controlling the signal source output of a transmitter so that the output impedances of the transmitters are equal. In the technology disclosed in Patent Document 1, the transmission level is controlled so that the output impedance of the transmitter matches the measured load impedance regardless of whether the train is on the line or not, and the transmission level is controlled for the ATC signal so that the output impedance of the transmitter matches the measured load impedance, regardless of whether the train is on the line or not. The transmission level is controlled so that the output impedance of the transmitter matches the load impedance at all times, and the power efficiency of the signal transmitted from the transmitter is maximized at all times. This has the effect of matching the output impedance of the transmitter and the load impedance of the track circuit, and maximizing power efficiency.

Japanese Patent Application Publication No. 2010-155589

The conventional track circuit transmitter described above is capable of supplying maximum power for both the TD signal and the ATC signal under varying track circuit load conditions. The reception level ratio between the train and the train when the train is not on the line is not necessarily the highest, and there is a possibility that optimal train detection performance cannot be obtained. In addition, since the maximum power is always supplied to both the TD signal and the ATC signal, a large amount of power is applied to the ground equipment (matching transformers, filters, etc.) and cables that make up the track circuit, so equipment dimensions and cable diameters are reduced. There is a problem that the size and cost also increase.

The present invention has been made in consideration of the above points, and one object of the present invention is to obtain better train detection performance in a track circuit transmitter. The purpose is to reduce the power applied to cables and downsize ground equipment and cables.

In order to solve the above problems, in one aspect of the present invention, a track circuit transmitter that transmits a signal to a track circuit includes an arithmetic processing unit that controls the transmission level of the signal and performs transmission processing, and a processing unit that controls the transmission level of the signal and performs transmission processing. an amplification section that amplifies the signal output from the section; a detection section that detects the output voltage and output current of the signal amplified by the amplification section; and the output voltage and the output current detected by the detection section. a calculation unit that calculates the load impedance of the track circuit from the above, and the calculation processing unit switches the control method of the transmission level based on the result of comparing the load impedance with a threshold value.

According to the present invention, for example, in a track circuit transmitter, better train detection performance can be obtained, and furthermore, the power applied to the ground equipment and cables that make up the track circuit can be suppressed, thereby reducing the size of the ground equipment and cables. can do.

1 is a block diagram showing the configuration of a track circuit transmitter according to Embodiment 1 of the present invention. FIG. It is a flowchart which shows the signal transmission process in the transmitter for track circuits based on Embodiment 1 of this invention. It is a flowchart which shows the signal reception process in the transmitter for track circuits based on Embodiment 1 of this invention. It is a flowchart which shows the output impedance control process at the time of TD signal reception in the track circuit transmitter based on Embodiment 1 of this invention. It is a figure for explaining the control law of the TD signal in the transmitter for track circuits concerning Embodiment 1 of the present invention. It is a flowchart which shows the output impedance control process at the time of ATC signal reception in the track circuit transmitter based on Embodiment 1 of this invention. It is a figure for explaining the control law of the ATC signal in the transmitter for track circuits concerning Embodiment 1 of the present invention. It is a block diagram showing the composition of the transmitter for track circuits concerning Embodiment 2 of the present invention. It is a block diagram showing the composition of the transmitter for track circuits concerning Embodiment 3 of the present invention.

Hereinafter, preferred embodiments of the present invention will be described. In the following, the same or similar elements and processes will be denoted by the same reference numerals, and redundant explanation will be omitted. In addition, in the embodiments to be described later, only the differences from the previously described embodiments will be explained, and redundant explanations will be omitted.

In addition, the following description and the configuration and processing shown in each figure are intended to illustrate the outline of the embodiment to the extent necessary for understanding and implementing the present invention, and are not intended to limit the embodiments of the present invention. This is not the intention. Moreover, each embodiment and each modification example can be combined in part or in whole within a mutually consistent range without departing from the spirit of the present invention.

[Embodiment 1]
<Configuration of track circuit transmitter 1 of embodiment 1>
FIG. 1 is a block diagram showing a configuration example of a track circuit transmitter 1 according to Embodiment 1 of the present invention. The configuration of the track circuit transmitter 1 shown in FIG. 1 is based on a case where a TD signal and an ATC signal are superimposed on an uninsulated track circuit in which the track boundary is not insulated.

As shown in FIG. 1, the track circuit transmitter 1 and receiver 2 are connected to each cable entry point at both ends of the rail 4 via a matching transformer 3, respectively.

The track circuit transmitter 1 includes an arithmetic processing section 11, an amplification section 12 that amplifies the transmission signal outputted by the arithmetic processing section 11, a voltage/current detection section 13 that detects the output voltage and output current of the amplification section 12, and It has a load impedance calculation unit 14 that calculates the load impedance of the amplification unit 12.

The arithmetic processing unit 11 and the voltage/current detection unit 13 have the respective frequencies of the TD signal and ATC signal, which perform transmission processing and reception processing, respectively, set in advance, and start transmission processing and reception processing at predetermined frequencies after power is turned on. do.

The arithmetic processing section 11 includes a transmission level control section 11a, a TD signal transmission processing section 11b, an ATC signal transmission processing section 11c, an adder 11d, and a DA (Digital Analog) converter 11e. The voltage/current detection section 13 includes AD (Analog Digital) converters 13a and 13b, a TD signal voltage reception processing section 13c, an ATC signal voltage reception processing section 13d, a TD signal current reception processing section 13e, and an ATC signal current reception processing section 13f. has. The processing of each part included in the arithmetic processing section 11 and the voltage/current detection section 13 will be described later.

<Signal transmission processing of Embodiment 1>
FIG. 2 is a flowchart showing signal transmission processing in the track circuit transmitter 1 according to the first embodiment of the present invention. As shown in the flowchart of FIG. 2, the arithmetic processing unit 11 receives the TD signal using the transmission level control unit 11a, the TD signal transmission processing unit 11b, and the DA converter 11e, and the transmission level control unit 11a, the ATC signal transmission processing unit 11c, and the DA converter 11e process the ATC signals independently and in parallel.

First, in step S11, the transmission level control unit 11a sets a transmission level value (voltage command value) of a transmission signal. Next, in step S12, the TD signal transmission processing section 11b and the ATC signal transmission processing section 11c of the track circuit transmitter 1 perform modulation processing on the respective transmission signals of the TD signal and the ATC signal according to a predetermined method. Frequency modulation (MSK, FSK) and amplitude modulation (AM, SSB) are commonly used in train control systems. This generates the main component of the transmission signal.

Next, in step S13, the TD signal transmission processing section 11b and the ATC signal transmission processing section 11c superimpose a predetermined carrier wave frequency on the main component of the transmission signal. Next, in step S14, the TD signal transmission processing unit 11b and the ATC signal transmission processing unit 11c perform filter processing on the processing result of step S13 to remove unnecessary frequency components generated in processing such as multiplication, Output the processing results. The adder 11d adds the output data from the TD signal transmission processing section 11b and the ATC signal transmission processing section 11c in step S14.

Next, in step S15, the DA converter 11e performs analog conversion on the addition result of the output data in step S14, converts it into a predetermined signal waveform, and outputs the signal waveform.

The amplification section 12 connected after the DA converter 11e outputs a transmission signal amplified to a predetermined power for transmission to the track circuit. The output of the amplifier section 12 is converted into an appropriate impedance by the matching transformer 3, and then transmitted to the track circuit and supplied to the rail 4 as a TD signal or an ATC signal.

<Signal reception processing of Embodiment 1>
FIG. 3 is a flowchart showing signal reception processing in the track circuit transmitter 1 according to the first embodiment of the present invention. A voltage sensor and a current sensor are mounted on the output section of the amplification section 12, and output signals from each sensor are input to the voltage/current detection section 13. In the voltage/current detection section 13, an AD converter 13a takes in the output signal from the voltage sensor, and an AD converter 13b takes in the output signal from the current sensor. The voltage level value of the TD signal and the voltage level value of the ATC signal based on the output signal from the voltage sensor, and the current level value of the TD signal and the current level value of the ATC signal based on the output signal from the current sensor are acquired individually in parallel. and processed.

First, in step S21, the AD converters 13a and 13b quantize and output the output signal from the voltage sensor and the output signal from the current sensor, respectively.

Next, in step S22, the TD signal voltage reception processing section 13c and the ATC signal voltage reception processing section 13d remove unnecessary noise component frequencies from the output data of the AD converter 13a using a filter having predetermined frequency characteristics.

Next, in step S23, the TD signal voltage reception processing section 13c and the ATC signal voltage reception processing section 13d each divide the processing result of step S22 by a preset carrier frequency, thereby converting the TD signal and the ATC signal. Extract the main component of the voltage signal.

Next, in step S24, the TD signal voltage reception processing section 13c and the ATC signal voltage reception processing section 13d each perform demodulation processing based on a predetermined method on the processing result of step S23, and extract control data and signals. Next, in step S25, the TD signal voltage reception processing section 13c and the ATC signal voltage reception processing section 13d calculate the reception levels of the output voltages of the TD signal and the ATC signal, respectively. The control data and signals extracted in step S24 are compared with the control data and signals that are about to be transmitted, and are used to detect failures in hardware and arithmetic processing systems related to the transmission process.

Similar to the reception processing in steps S22 to S25 by the TD signal voltage reception processing section 13c and the ATC signal voltage reception processing section 13d, the TD signal current reception processing section 13e and the ATC signal current reception processing section 13f are also individually arranged in parallel. Then, the reception processing of steps S22 to S25 is performed. That is, the TD signal current reception processing section 13e and the ATC signal current reception processing section 13f finally calculate the reception levels of the output currents of the TD signal and the ATC signal from the output data of the AD converter 13b.

The output voltage and output current level values of the TD signal and ATC signal from the amplifier section 12 calculated in this way are input to the load impedance calculation section 14. Here, the load impedance of the amplifying section 12, that is, the track circuit impedance obtained by converting the transmission system, is calculated by taking the ratio of voltage and current.

Here, when no train has entered the rail 4, that is, when there is no train on the track circuit, the TD signal and ATC signal sent to the rail 4 are input to the receiver 2 connected to the opposite side. be done. Since the track circuit impedance is high to a certain extent, a receiving level (receiving voltage) of the TD signal is calculated that is above a certain level, so if this receiving voltage is above a predetermined value, the system determines that the train is not on the track. be judged. Note that the ATC signal is a signal sent to a train, and transmission may be stopped when a train is not on the line.

On the other hand, when a train is intruding on rail 4, that is, when a train is present on the track circuit, the two rails are short-circuited by multiple axles in that section, so the track circuit impedance decreases and the reception The reception level of the TD signal input to the device 2 decreases. When the amount of decrease in the reception level of this TD signal is less than a predetermined ratio of the reception level when the train is not on the line, the system determines that the train is on the line. Stable train detection characteristics can be achieved when the ratio of the reception level when a train is on the line and when it is not on the line is large.

In addition, the ATC signal is obtained by converting the current flowing through the axle of a train on the track circuit into a voltage by electromagnetic induction using a power receiver (antenna) mounted on the train, and inputting it to the receiver. Data is extracted through processing and predetermined train control (braking, stopping) is performed.

The impedance of the track circuit including the rail 4 is not constant due to weather, rail length, presence or absence of tunnels and bridges, etc., and it is important in a train control system to realize stable transmission of TD signals and ATC signals.

For this reason, for TD signals, the reception level ratio that determines whether a train is on the track or not, and for ATC signals, the minimum value of the current that flows when an axle is short-circuited is determined for each system and line, and these predetermined conditions are satisfied. Track circuit design, equipment design, and pre-operation adjustment work are currently underway.

In such a configuration, the track circuit transmitter 1 of the present invention operates as follows.

<Output impedance control processing when receiving TD signal in Embodiment 1>
First, control of the TD signal will be explained using the flowchart of FIG. 4 and the graph of FIG. 5. FIG. 4 is a flowchart showing output impedance control processing when receiving a TD signal in the track circuit transmitter 1 according to the first embodiment of the present invention. FIG. 5 is a diagram for explaining the control law of the TD signal in the track circuit transmitter 1 according to the first embodiment of the present invention.

First, in step S101, the load impedance calculation unit 14 obtains the output voltage V _Z (t) and output current I _Z (t) of the amplification unit 12 calculated by the voltage/current detection unit 13. “t” is an index representing timing. Next, in step S102, the load impedance calculation unit 14 calculates the track circuit impedance Z L (t)= _{V Z} (t)/ from the output voltage V _Z (t) and output current I _Z (t) acquired in step S101. Calculate I _Z (t).

Next, in step S103, the transmission level control unit 11a compares the track circuit impedance Z _L (t) with a predetermined threshold Z ₁ . The threshold _Z1 is a value determined for each line, and is set near a value (for example, an intermediate value) between each track circuit impedance when a train is not on the line and when a train is on the line. This value is determined by taking into consideration (rail length, cable length, leakage conductance to the ground, weather fluctuations, etc.).

Then, in the case of Z _L (t)≧Z ₁ (Step S103 Yes, timing of t≦t ₁ in FIG. 5), the transmission level control unit 11a can determine that there is no train on the rail 4, and the power of the TD signal In order to maximize efficiency, as shown in FIG. 5, the equivalent output impedance Z _O of the track circuit transmitter 1 is equal to Z _L (t) based on the following equations (1) and (2) , and control the output voltage V _O (t) (steps S104 and S105).
V _s (t) = V _Z (t) + Z _L × I _Z (t) ... (1)
V _O (t)=V _O (t-1)+{V _s (t)-V _s0 }×G _i ...(2)
Here, V _s0 is a control target value, and is a value determined from the rated output power of the track circuit transmitter 1 and the output impedance target value. Further, G _i is an integral control gain, which is used to apply damping so that the control result does not oscillate in the process of controlling to correct the difference between the current state value and the target value.

In addition, the transmission level control unit 11a can determine that a train is on the rail 4 or is approaching when Z _L (t) < Z ₁ (No in step S103, timing of t ₁ < t in FIG. 5). In order to reduce the power efficiency of the TD signal, the equivalent output impedance _ZO of the track circuit transmitter 1 is fixed at _Z1 , as shown in FIG. , and control the output voltage V _O (t) (steps S106 and S107).
V _s (t) = V _Z (t) + Z ₁ × I _Z (t) ... (3)
V _O (t)=V _O (t-1)+{V _s (t)-V _s0 }×G _i ...(4)

<Output impedance control processing when receiving ATC signal in Embodiment 1>
Next, control of the ATC signal will be explained using the flowchart of FIG. 6 and the graph of FIG. 7. FIG. 6 is a flowchart showing output impedance control processing when receiving an ATC signal in the track circuit transmitter 1 according to the first embodiment of the present invention. FIG. 7 is a diagram for explaining the control law of the ATC signal in the track circuit transmitter 1 according to the first embodiment of the present invention. In FIG. 6, steps S101 to S105 are the same as in FIG. 4, except that when step S103 is No, step S108 is executed instead of steps S106 and S107.

In the case of Z _L (t) < Z ₁ (No in step S103, the timing of t ₁ < t in FIG. 7), the transmission level control unit 11a can determine that a train is on the rail 4 or is approaching. In order to perform constant current control to ensure that the ATC signal current flowing through the axle is above a certain value, as shown in _FIG . The output voltage V _O (t) is controlled based on equation (5).
V _O (t)=V _O (t-1)+{I _Z (t)-I ₀ }×G _i ...(5)
Here, _I0 is a control target value, and is a converted value obtained by converting the impedance from the rail to the transmitter load with respect to the target value of the ATC signal current flowing to the axle.

According to the track circuit transmitter 1 of this embodiment, when the load impedance is larger than the threshold _Z1 for the TD signal, that is, when the train is not on the line, the output impedance of the amplifier section 12 and the load impedance are matched, and the power efficiency is improved. Since this is the maximum, the TD signal level detected by the receiver is the highest. In addition, when the load impedance is smaller than the threshold Z ₁ , that is, when a train is on the line, the output impedance of the amplifying section 12 is set to a fixed value Z ₁ , intentionally deteriorating the power efficiency, thereby increasing the TD signal level detected by the receiver 2. lower.

By doing so, the detected power ratio between when the train is on the line and when the train is not on the line becomes large, and good train detection characteristics can be obtained. Regarding the ATC signal, by setting the output current of the amplifier 12 constant when the load impedance is smaller than the threshold value _Z1 , that is, when a train is on the line, this target value is set as a value larger than the minimum current value determined for each line. By doing so, ATC signal characteristics suitable for train control can be obtained regardless of load conditions.

Furthermore, by reducing the power efficiency of the TD signal and controlling the ATC signal so that a predetermined current value is obtained when a train is on the track, where large amounts of power tend to be applied, excessive power application can be suppressed, and the track circuit configuration This makes it possible to reduce the power consumption of devices and cables, which allows devices and cables to be miniaturized and costs to be reduced.

As described above, according to the present embodiment, when a train is not on the line, the transmission power efficiency of the TD signal can be maximized, and a sufficiently high reception level can be obtained to determine that the train is not on the line. Furthermore, when a train is on the track, in TD signal transmission, the output of the track circuit transmitter 1 is controlled with an equivalent output impedance Z _O that is relatively high with respect to the track circuit impedance Z _L (t). The power of the TD signal to be transmitted can be suppressed, a sufficiently low reception level can be obtained, and there is no need to apply excessive power to the matching transformer, cables, etc. that constitute the track circuit.

Furthermore, in ATC signal transmission, stable signal transmission can be performed with the minimum amount of power by controlling so that a necessary short-circuit current flows through the track circuit whose impedance has decreased. In this way, ground equipment such as matching transformers and filters connected to the track circuit transmitter 1 are made smaller and have lower power resistance than conventional ones, allowing the use of cables with smaller diameters and reducing costs. be able to.

[Embodiment 2]
<Configuration of track circuit transmitter 1 of embodiment 2>
FIG. 8 is a block diagram showing the configuration of a track circuit transmitter 1B according to Embodiment 2 of the present invention. The track circuit transmitter 1B is configured to transmit only TD signals.

The arithmetic processing unit 11B and the voltage/current detection unit 13B have a frequency of a TD signal for which transmission and reception processing is to be performed specified in advance, and start transmission processing and reception processing at a predetermined frequency after the power is turned on. The track circuit transmitter 1B sets frequency 0 to the ATC signal transmission processing section 11c, ATC signal voltage reception processing section 13d, and ATC signal current reception processing section 13f related to ATC signal processing, or stops these operations. Therefore, it is possible to configure the transmitter 1 with the same hardware as the track circuit transmitter 1 of the first embodiment. In other respects, the track circuit transmitter 1B is the same as the track circuit transmitter 1, and can obtain the same effects as the first embodiment regarding the TD signal.

[Embodiment 3]
<Configuration of track circuit transmitter 1 of embodiment 3>
FIG. 9 is a block diagram showing the configuration of a track circuit transmitter 1C according to Embodiment 3 of the present invention. The track circuit transmitter 1C is configured so that one signal serves as a TD signal and an ATC signal. The track circuit transmitter 1C is a transmitter used in an insulated track circuit in which the track circuit boundary is insulated.

In the track circuit transmitter 1C, the arithmetic processing section 11C and the voltage/current detection section 13C are connected to a TD signal transmission processing section 11b, a TD signal voltage reception processing section 13c, and a TD signal current reception processing section 13e related to TD signal processing. Either the frequency is set to 0 or these are stopped. In this way, the track circuit transmitter 1C operates the ATC signal transmission processing section 11c, the ATC signal voltage reception processing section 13d, and the ATC signal current reception processing section 13f to generate a dual-purpose signal that serves as both the TD signal and the ATC signal. Process. Thereby, it is possible to configure the track circuit transmitter 1C with the same hardware as the track circuit transmitter 1 of the first embodiment.

Then, the track circuit transmitter 1C performs transmission level control based on the flowchart shown in FIG. 6 and equations (1), (2), and (5). In the case of this embodiment, since a dual-purpose signal serving as both a TD signal and an ATC signal is used, the train detection characteristics are different from those in the first and second embodiments. However, as can be seen from FIG. 7, the signal power obtained when controlling the equivalent output impedance Z _O of the track circuit transmitter 1 when Z _L (t)≧Z ₁ and no train is on the track (t≦t ₁ in FIG. 7) While the efficiency is maximum, when the train is on the line with Z _L (t) < Z ₁ (t ₁ < t in Fig. 7), the transmission power efficiency is lowered, so the axle short circuit occurs based on equation (5). Even if the current is controlled to be constant, the reception level input to the receiver 2 as a TD signal will be a sufficiently low value. Therefore, good characteristics can be obtained for detecting the presence of trains.

In addition, since the power of the ATC signal, which also serves as a TD signal, that is sent to the track circuit when a train is on the track can be suppressed, there is no need to apply excessive power to devices such as matching transformers and cables that make up the track circuit. The effect that devices, cables, etc. can be made smaller is the same as in the first and second embodiments.

Note that the present invention is not limited to the embodiments described above, and includes various modifications. For example, the above-described embodiments have been described in detail to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to having all the configurations described. Further, as long as there is no contradiction, it is also possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, replace, integrate, or distribute a part of the configuration of each embodiment. Furthermore, the configurations and processes shown in the embodiments can be distributed, integrated, or replaced as appropriate based on processing efficiency or implementation efficiency.

1, 1B, 1C: Track circuit transmitter, 2: Receiver, 3: Matching transformer, 4: Rail, 11, 11B, 11C: Arithmetic processing unit, 11a: Transmission level control unit, 11b: TD transmission processing unit , 11a: Transmission level control section, 11b: TD signal transmission processing section, 11c: ATC signal transmission processing section, 11c: ATC signal transmission processing section, 11d: Adder, 11e: DA converter, 12: Amplification section, 13, 13B , 13C: Voltage/current detection section, 13a, 13b: AD converter, 13c: TD signal voltage reception processing section, 13d: ATC signal voltage reception processing section, 13e: TD signal current reception processing section, 13f: ATC signal current reception processing section Section, 14, 14B, 14C: Load impedance calculation section

Claims (6)

A track circuit transmitter that transmits a signal to the track circuit,
an arithmetic processing unit that controls the output voltage of the signal and performs transmission processing;
an amplifying section that amplifies the power of the signal output from the arithmetic processing section;
a detection unit that detects the output voltage and output current of the signal whose power has been amplified by the amplification unit;
a calculation unit that calculates a load impedance of the track circuit from the output voltage and the output current detected by the detection unit,
The signal is a signal in which at least a TD signal for detecting whether or not a train is on the track circuit and an ATC signal for controlling a train on the track circuit are superimposed,
The arithmetic processing unit is
comparing the load impedance to a threshold;
Regarding the TD signal, when the load impedance is equal to or higher than the threshold value , the output voltage is controlled so that the output impedance of the track circuit transmitter matches the load impedance, and the load impedance is less than the threshold value. If so, controlling the output voltage so that the output impedance matches the threshold value,
Regarding the ATC signal, when the load impedance is equal to or higher than the threshold value, the output voltage is controlled so that the output impedance matches the load impedance, and when the load impedance is less than the threshold value, the output voltage is controlled so that the output impedance matches the load impedance. A track circuit transmitter, characterized in that the output voltage is controlled so that the output current is constant. A track circuit transmitter that transmits a signal to the track circuit,
an arithmetic processing unit that controls the output voltage of the signal and performs transmission processing;
an amplifying section that amplifies the power of the signal output from the arithmetic processing section;
a detection unit that detects the output voltage and output current of the signal whose power has been amplified by the amplification unit;
a calculation unit that calculates a load impedance of the track circuit from the output voltage and the output current detected by the detection unit,
The signal is a dual-purpose signal that serves at least as a TD signal for detecting whether a train is on the track circuit or not, and an ATC signal for controlling a train on the track circuit,
The arithmetic processing unit is
comparing the load impedance to a threshold;
Regarding the dual-purpose signal, when the load impedance is equal to or higher than the threshold value , the output voltage is controlled so that the output impedance of the track circuit transmitter matches the load impedance, and when the load impedance is less than the threshold value, the output voltage is controlled so that the output impedance of the track circuit transmitter matches the load impedance. A track circuit transmitter characterized in that, in some cases, the output voltage is controlled so that the output current is constant. A track circuit transmitter that transmits a signal to the track circuit,
an arithmetic processing unit that controls the output voltage of the signal and performs transmission processing;
an amplifying section that amplifies the power of the signal output from the arithmetic processing section;
a detection unit that detects the output voltage and output current of the signal whose power has been amplified by the amplification unit;
a calculation unit that calculates a load impedance of the track circuit from the output voltage and the output current detected by the detection unit,
The signal is a TD signal for detecting whether a train is on the track or not on the track circuit,
The arithmetic processing unit is
comparing the load impedance to a threshold;
Regarding the TD signal, when the load impedance is equal to or greater than the threshold value, the output voltage is controlled so that the output impedance of the track circuit transmitter matches the load impedance, and when the load impedance is less than the threshold value. A track circuit transmitter characterized in that, in some cases, the output voltage is controlled so that the output impedance matches the threshold value. The track circuit transmitter according to any one of claims 1 to 3 ,
The arithmetic processing unit is
When controlling the output voltage of the signal, the previous value of the parameter to be controlled is added to a value obtained by multiplying the deviation of the current value of the parameter to the target value by a predetermined gain to determine the current value of the parameter to be controlled. A track circuit transmitter characterized by calculating a value. The track circuit transmitter according to any one of claims 1 to 4 ,
The track circuit transmitter, wherein the threshold value is a value between the load impedances when the train is not on the track and when the train is on the track. The track circuit transmitter according to claim 5 ,
The transmitter for a track circuit, wherein the threshold value is a value determined based on predetermined assumed conditions of the track circuit.

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