JPH11340892A - Train wireless relay system and power supply method thereof - Google Patents

Abstract

(57) [Summary] [Problem] Since commercial frequency AC power is transmitted from a base station 7 to a relay station 4, the relay station 4 must use a commercial frequency transformer 5 having a large weight and a large size. No. SOLUTION: A DC power is transmitted from a base station power supply device 12 provided in a base station 7. In a relay station 4, the received DC power is converted into a high frequency AC power by an inverter 11a, and the weight and the shape are changed. The high-frequency AC power supply 11b, which is light in size and small in size, transforms the high-frequency AC power supply, rectifies the AC power supply by the rectifier 11c to supply DC power to the lower relay station 4, and a DC stabilized power supply 11d. To convert the AC power into a stabilized DC power, and use it as an intra-station power in the relay station 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio relay system for a train and a power supply method thereof.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram showing a conventional train radio relay system. In FIG. 2, 1 is a train, 2 is a communication signal between the train 1 and the ground, and 3 is a train 1 A leaky coaxial cable (hereinafter referred to as LCX) for transmitting and receiving a communication signal 2 between the train 1 and the ground;
A plurality of relay stations are provided on the way of the LCX3 and relay communication signals. In the relay station 4, 5 is a commercial frequency transformer, and 6 is a converter for converting an AC power source transformed by the commercial frequency transformer 5 into a stabilized DC power source.
This is a DC stabilized power supply used as an intra-station power supply in the relay station 4. Reference numeral 7 denotes a base station provided at one end of the LCX 3 for transmitting and receiving a communication signal 2 to and from the train 1 via the LCX 3.
This is a base station power supply that supplies AC power of a commercial frequency to the relay station 4 via X3.

Next, the operation will be described. Transmission / reception of the communication signal 2 between the train 1 and the base station 7 is performed via the LCX 3 and the relay stations 4 provided on the way of the LCX 3. Therefore, in this case, the LCX 3 serves as an antenna and transmits and receives the communication signal 2 to and from the train 1. When the communication signal 2 is received from the train 1 and the received communication signal 2 is transmitted to the base station 7, or the communication signal 2 is transmitted from the base station 7 via the LCX 3 and the communication signal 2 is transmitted to the train 1. When transmitting to, the communication signal 2
Is attenuated by the long laid LCX 3, the communication function 2 is amplified by the amplification function of each relay station 4, and the loss due to the attenuation is corrected.

[0004] Intra-station power of the relay station 4 is supplied from a base station 7. An AC power supply having a commercial frequency of 50 Hz or 60 Hz is transmitted from the base station power supply device 8 provided in the base station 7 via the LCX 3. Accordingly, in this case, the LCX 3 serves as a transmission line, and transmits AC power between the base station 7 and the relay station 4 and between the relay station 4 and the lower relay station 4. In the relay station 4, the received AC power is transformed by the commercial frequency transformer 5, and further,
The transformed AC power supply is converted into a DC stabilized power supply by a DC stabilized power supply device 6 and used as an in-station power supply for satisfying an amplification function in the relay station 4. Further, the commercial frequency transformer 5 transmits the AC power to the lower relay station 4 via the LCX 3. Here, the transmitted AC power is stepped down by a voltage drop due to the resistance component of the long laid LCX3, so that the AC power is stepped up by the tap switching function of the commercial frequency transformer 5 and the stepped down voltage due to the voltage drop is reduced. to correct.

[0005]

Since the conventional train radio relay system is configured as described above, a commercial frequency AC power is transmitted from the base station 7 to the relay station 4, and the relay station 4 receives power. The AC power must be transformed by the commercial frequency transformer 5. Here, the low-frequency transformer such as the commercial frequency transformer 5 is large in both weight and shape and size, and therefore, the relay station 4 must be enlarged, and a large area is required for installing the relay station 4. And other issues.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a train radio relay system and a power supply for the train which facilitate installation of the relay station by using a smaller and lighter relay station. The purpose is to obtain a power supply method.

[0007]

A train radio relay system according to the present invention includes a base station power supply device provided in a base station for supplying DC power through a transmission line, and a DC power supply provided in each relay station. And a relay station power supply unit for stabilizing the power supply to be used as a power supply in the relay station and for supplying DC power to a lower relay station via a transmission line.

According to the power supply method for a train radio relay system according to the present invention, a DC power is supplied from a base station to a relay station via a transmission line, and the relay station stabilizes the supplied DC power to supply power to the relay station. And supplies DC power to the relay station below via a transmission line.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a block diagram showing a train radio relay system according to Embodiment 1 of the present invention. In the drawing, reference numeral 1 denotes a train, 2 denotes a communication signal between the train 1 and the ground, and 3 denotes a running path of the train 1. And a plurality of leaky coaxial cables (transmission path: hereinafter referred to as LCX) 4 for transmitting and receiving communication signals 2 between the train 1 and the ground are provided along the LCX 3 to relay communication signals. It is a relay station. In the relay station 4, a relay station power supply device 11 stabilizes the supplied DC power and uses it as power in the relay station, and supplies DC power to the lower relay station 4 via the transmission line 3. In the relay station power supply 11, 11a is an inverter for converting the supplied DC power to high-frequency AC power, 11b is a high-frequency transformer for converting the high-frequency AC power converted by the inverter 11a, and 11c is the high-frequency transformer. Rectifies the AC power transformed by the power transformer 11b and sends the rectified
A rectifier for supplying DC power through the DC power supply 11d rectifies the AC power transformed by the high-frequency transformer 11b, converts the rectified AC power into a stabilized DC power, and supplies the internal power in the relay station 4. This is a DC stabilized power supply used as a power supply. 7 is provided at one end of LCX3,
A base station for transmitting and receiving a communication signal 2 to and from the train 1 via X3.
Is a base station power supply device for supplying DC power to the relay station 4 via the.

Next, the operation will be described. Transmission / reception of the communication signal 2 between the train 1 and the base station 7 is performed via the LCX 3 and the relay stations 4 provided on the way of the LCX 3. Therefore, in this case, the LCX 3 serves as an antenna and transmits and receives the communication signal 2 to and from the train 1. When the communication signal 2 from the train 1 is received and the received communication signal 2 is transmitted to the base station 7, or
When the communication signal 2 is transmitted from the base station 7 via the LCX 3 and the communication signal 2 is transmitted to the train 1, the communication signal 2 is attenuated by the long laid LCX 3. , Amplifies the communication signal 2 and corrects the loss due to attenuation.

[0011] The intra-station power of the relay station 4 is supplied from the base station 7. DC power is transmitted from the base station power supply device 12 provided in the base station 7 via the LCX 3. Accordingly, in this case, the LCX 3 serves as a transmission line, and transmits DC power between the base station 7 and the relay station 4 and between the relay station 4 and the lower relay station 4. In the relay station 4, the received DC power is once converted into, for example, a high-frequency AC power of 100 kHz by the inverter 11a.
In addition, the high frequency transformer 11b uses the inverter 11
The high-frequency AC power converted by a is transformed. Then, the AC power transformed by the high frequency transformer 11b is rectified by the rectifier 11c, and DC power is supplied to the lower relay station 4 via the LCX3. On the other hand, the stabilized DC power supply device 11d rectifies the AC power transformed by the high-frequency transformer 11b, further converts the AC power into a stabilized DC power, and satisfies the amplifying function in the relay station 4. It is used as an in-station power supply. Here, the transmitted DC power source is stepped down by a voltage drop due to the resistance of the long laid LCX3, so that the AC power source is stepped up by the tap switching function of the high frequency transformer 11b,
The step-down component due to the voltage drop is corrected.

As described above, according to the first embodiment, DC power is transmitted from the base station power supply device 12 provided in the base station 7 via the LCX 3, and the received DC power is transmitted to the relay station 4. The power supply is once converted into a high-frequency AC power supply by an inverter 11a, and the high-frequency AC power supply is converted by a high-frequency transformer 11b.
Rectifies the transformed AC power supply, supplies DC power to the lower relay station 4 via the LCX 3, and converts the transformed AC power supply into a DC stabilized power supply by the DC stabilized power supply device 11d. The high frequency transformer 11b, which is light in weight and shape and size and small in size and size, can be used as the relay station power supply device 11 because it is converted and used as an in-station power supply in the relay station 4. Station 4
Therefore, there is an effect that the installation of the relay station 4 can be facilitated.

[0013]

As described above, according to the present invention, DC power is supplied from the base station power supply to the relay station power supply, so that the relay station power supply is light and small in both weight and shape. Since a high frequency transformer can be used, and the size of the relay station can be reduced, there is an effect that the installation of the relay station can be facilitated.

Further, according to the present invention, since DC power is supplied from the base station to the relay station, a small high-frequency transformer that is light in weight and shape and size is used as the relay station power supply device of the relay station. Therefore, the size of the relay station can be reduced, so that the installation of the relay station can be facilitated.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a train radio relay system according to Embodiment 1 of the present invention.

FIG. 2 is a block diagram showing a conventional train radio relay system.

[Explanation of symbols]

1 train, 3 leaky coaxial cable (transmission line), 4 relay stations, 7 base stations, 11 relay station power supplies, 12 base station power supplies.

Claims (2)

[Claims] 1. A transmission line laid along a traveling path of a train for transmitting and receiving a communication signal between the train and the ground, a relay station provided on a plurality of paths along the transmission line and relaying the communication signal, A base station provided at one end of a transmission line for transmitting and receiving a communication signal to and from the train via the transmission line, a DC power supply provided at the base station via the transmission line. A base station power supply device for supplying DC power supplied through the transmission line provided in each of the relay stations, and used as a power source in the relay station, and a lower relay station through the transmission line. A train radio relay system comprising: a relay station power supply for supplying DC power. 2. Transmission and reception of a communication signal between a train and the ground through a transmission line laid along a running path of the train, and relaying the communication signal by a plurality of relay stations provided along the transmission line. And a base station provided at one end of the transmission line for transmitting / receiving a communication signal to / from the train via the transmission line. While supplying DC power to the relay station, the relay station stabilizes the DC power supplied via the transmission line and uses it as power in the relay station, and supplies the lower relay station via the transmission line to the lower relay station. A power supply method for a train wireless relay system, comprising supplying a DC power supply.