JP7369640B2 - Auxiliary power supply - Google Patents

Description

The present invention relates to an auxiliary power supply device for a railway vehicle.

Trains operate in accordance with the signals displayed to avoid collisions with other trains and ensure safety. However, if the driver fails to notice the signals or is delayed in applying the brakes, serious accidents such as train collisions may occur. To prevent such accidents, automatic train stop devices (ATS) are generally provided that automatically operate the train's brakes and stop the train by the stop signal. The ATS consists of a ground transducer installed on the ground and an onboard transducer mounted on a vehicle. The beacon transmits information such as signal indications and speed limits to the train, and the onboard transducer receives information from the beacon and automatically applies the brakes depending on the conditions. It is known that a ground element generally includes a coil or a relay (see, for example, Non-Patent Document 1).

Moreover, an auxiliary power supply device is installed in the railway vehicle to convert electric power from an overhead wire into electric power for an auxiliary circuit using an inverter and to supply the converted electric power (see, for example, Non-Patent Document 2). The inverter turns on and off switching elements such as IGBTs (Insulated Gate Bipolar Transistors), and therefore becomes a source of noise.

“Automatic train stopping device”, [online], [searched on November 22, 2019], Internet <URL: https://ja.wikipedia.org/wiki/%E8%87%AA%E5%8B%95% E5%88%97%E8%BB%8A%E5%81%9C%E6%AD%A2%E8%A3%85%E7%BD%AE> Masayoshi Inoue, “About auxiliary power supply devices for railway vehicles”, October 2014, [online], [searched on November 22, 2019], Internet <URL: https://www.tetsushako.or.jp/page_file/ 20141022131624_lkPJ20N3Fe.pdf>

When the auxiliary power supply device is installed under the floor of a railway vehicle, the distance between the auxiliary power supply device and the ground switch becomes shorter. Therefore, if a ground element having a coil is located near an auxiliary power supply device that generates radiated noise, noise may be induced by electromagnetic induction and there is a risk that the ground element may malfunction.

An object of the present invention, which has been made in view of the above circumstances, is to provide an auxiliary power supply device that can suppress the influence of radiation noise on railway signal equipment such as a beacon.

The auxiliary power supply device according to one embodiment is an auxiliary power supply device that is installed under the floor of a railway vehicle, and operates a filter capacitor that maintains the overhead line voltage input from the overhead line at a constant voltage, and a switching element to operate the input line voltage. an inverter circuit that converts electric power into AC power; and a shield plate disposed at a position intersecting a straight line connecting the switching element and railway signal equipment installed on the ground , the shield plate being arranged on the outer wall of the filter capacitor. It is characterized by being installed in

The auxiliary power supply device according to one embodiment is an auxiliary power supply device that is installed under the floor of a railway vehicle, and operates a filter capacitor that maintains the overhead line voltage input from the overhead line at a constant voltage, and a switching element to operate the input line voltage. It includes an inverter circuit that converts electric power into AC power, and a shield plate disposed at a position intersecting a straight line connecting the switching element and railway signal equipment installed on the ground, and the shield plate It is characterized by being installed on the outer wall.

The auxiliary power supply device according to one embodiment is an auxiliary power supply device that is installed under the floor of a railway vehicle, and operates a filter capacitor that maintains the overhead line voltage input from the overhead line at a constant voltage, and a switching element to operate the input line voltage. an inverter circuit that converts electric power into AC power; and a shield plate disposed at a position intersecting a straight line connecting the switching element and railway signal equipment installed on the ground, and the switching element is connected to the railway signal equipment installed on the ground. The distance between the filter capacitor and the railway signal equipment is longer than the distance between the filter capacitor and the railway signal equipment.

According to the present invention, it is possible to provide an auxiliary power supply device that can suppress the influence of radiation noise on railway signal equipment.

FIG. 2 is a block diagram showing a configuration example of an auxiliary power supply device according to an embodiment. FIG. 1 is a plan view showing an example of an auxiliary power supply device according to an embodiment.

Hereinafter, one embodiment will be described in detail with reference to the drawings.

FIG. 1 shows a configuration example of an auxiliary power supply device according to an embodiment. The auxiliary power supply device 1 shown in FIG. 1 includes a filter capacitor 10 and an inverter circuit 20.

The filter capacitor 10 maintains the overhead line voltage (for example, DC 1500V) input from the overhead line at a constant voltage.

The inverter circuit 20 includes a plurality of switching elements 21 (for example, IGBT). A free wheel diode 22 is connected in parallel to each switching element 21 . Since the inverter circuit 20 shown in FIG. 1 is of a three-level inverter type, the auxiliary power supply device 1 includes two filter capacitors 10 and twelve switching elements 21. In the three-level inverter system, voltages across two filter capacitors 10 are used for control. Note that the inverter circuit 20 may be of a two-level inverter type and may include one filter capacitor 10 and six switching elements 21. The inverter circuit 20 turns on and off the switching element 21 to generate three-phase AC power and outputs it to the AC filter 30.

The switching element 21 is turned on and off based on PWM (Pulse Width Modulation) control, and a gate signal is input to the gate of the switching element 21 from a control circuit (not shown).

The AC filter 30 shapes the waveform of the voltage input from the inverter circuit 20 into a sine wave, and outputs it to the transformer 40 .

The transformer 40 converts the voltage input from the AC filter 30 into a predetermined voltage (for example, AC440V), insulates it, and outputs it. Thereby, the auxiliary power supply device 1 supplies AC power to the load circuit.

FIG. 2 shows an example of a plan view when the auxiliary power supply device 1 shown in FIG. 1 is installed under the floor of a railway vehicle. A filter capacitor 10-2 is arranged at the back of the filter capacitor 10-1. Note that the filter capacitor 10' is a spare filter capacitor (a filter capacitor for ensuring disconnection of the pantograph), and is not an essential component.

The gate output board 25 is a board on which a control circuit that generates a gate signal for on/off control of the switching element 21 is mounted.

In the auxiliary power supply device 1 that is suspended below the floor, the distance between the bottom surface of the auxiliary power supply device 1 and the ground is as short as several tens of centimeters. When the distance between the auxiliary power supply device 1 and the railway signal equipment 2 installed on the ground, such as a beacon, becomes shorter, the radiation noise of the auxiliary power supply 1 has a negative effect on the railway signal equipment 2, and the railway signal equipment 2 may malfunction. Furthermore, as the number of switching elements 21 increases, radiation noise also increases. Therefore, the auxiliary power supply device 1 includes a shield plate 50.

The shield plate 50 is made of aluminum, for example. The shield plate 50 is arranged at a position intersecting a straight line connecting the switching element 21 and the railway signal equipment 2. Here, a straight line connecting the switching element 21 and the railway signal equipment 2 is a straight line connecting one of the plurality of switching elements 21 and an arbitrary position in the railway signal equipment 2 (for example, a coil arrangement position). Say something.

It is desirable that the shield plate 50 be installed at a location that is easy to attach and is resistant to vibrations. In FIG. 2, shield plates 50-1 and 50-2 installed at locations that are easy to install and strong against vibrations are indicated by thick lines. The number of shield plates 50 installed is arbitrary. In the example shown in FIG. 2, the auxiliary power supply device 1 includes two shield plates 50-1 and 50-2, but it may include only one of them.

The shield plate 50-1 is installed between the filter capacitors 10-1, 10-2 and the gate output board 25, and on the outer wall of the filter capacitors 10-1, 10-2.

The shield plate 50-2 is installed in the casing 5 of the auxiliary power supply device 1. The shield plate 50-2 can be installed on either the outer or inner surface of the casing 5, but if the casing 5 is provided with a cover, the shield plate 50-2 should be installed in a position that does not interfere with opening and closing the cover. It is desirable that the system be installed in Therefore, the shield plate 50-2 can be divided as appropriate depending on the position of the housing cover so as not to hinder the opening and closing of the housing cover, and can be installed on the outer surface and the inner surface of the housing 5. In the example shown in FIG. 2, the shield plate 50-2 is divided into two parts and installed on the outer and inner surfaces of the casing 5 so as not to hinder the opening and closing of the casing cover 6. Note that the position of the housing cover 6 is not limited to this.

The auxiliary power supply device 1 includes a cooler 60 for cooling the switching element 21. Further, the auxiliary power supply device 1 may include a current detector 26 that detects the output current of the inverter circuit 20.

It is desirable that the distance from the switching element 21, which is a source of noise, to the railway signal equipment 2 is long. Therefore, the filter capacitor 10 is arranged at the center of the railway vehicle, and the switching element 21 is arranged at the outside of the railway vehicle. In other words, the switching element 21 is arranged such that the distance from the switching element 21 to the railway signal equipment 2 is longer than the distance from the filter capacitor 10 to the railway signal equipment 2.

As explained above, the auxiliary power supply device 1 includes the shield plate 50 arranged at a position intersecting the straight line connecting the switching element 21 and the railway signal equipment 2. Therefore, the influence of the radiation noise of the auxiliary power supply device 1 on the railway signal equipment 2 can be reduced. Therefore, it is possible to prevent the railway signal equipment 2 from malfunctioning due to the influence of radiation noise. Further, by installing the shield plate 50 on the outer wall of the filter capacitor 10 or on the housing 5 of the auxiliary power supply device 1, it is possible to prevent the shield plate 50 from coming off due to vibration.

Although the embodiments described above have been described as representative examples, it will be apparent to those skilled in the art that many modifications and substitutions can be made within the spirit and scope of this disclosure. Therefore, the present invention should not be construed as being limited to the above-described embodiments, and various modifications and changes can be made without departing from the scope of the claims. For example, it is possible to combine a plurality of configuration blocks described in the configuration diagram of the embodiment into one, or to divide one configuration block. Further, the dimensions shown in FIG. 2 may be changed as appropriate.

1 Auxiliary power supply device 2 Railway signal equipment 5 Housing 6 Housing cover 10, 10' Filter capacitor 20 Inverter circuit 21 Switching element 22 Free wheel diode 25 Gate output board 26 Current detector 30 AC filter 40 Transformer 50 Shield plate 60 Cooler

Claims (3)

An auxiliary power supply device installed under the floor of a railway vehicle,
A filter capacitor that maintains the overhead line voltage input from the overhead line at a constant voltage,
an inverter circuit that converts input power into AC power by operating a switching element;
a shield plate disposed at a position intersecting a straight line connecting the switching element and railway signal equipment installed on the ground;
Equipped with
The shield plate is an auxiliary power supply device installed on an outer wall of the filter capacitor . An auxiliary power supply device installed under the floor of a railway vehicle,
A filter capacitor that maintains the overhead line voltage input from the overhead line at a constant voltage,
an inverter circuit that converts input power into AC power by operating a switching element;
a shield plate disposed at a position intersecting a straight line connecting the switching element and railway signal equipment installed on the ground;
Equipped with
The shield plate is an auxiliary power supply device installed in a case of the auxiliary power supply device. An auxiliary power supply device installed under the floor of a railway vehicle,
A filter capacitor that maintains the overhead line voltage input from the overhead line at a constant voltage,
an inverter circuit that converts input power into AC power by operating a switching element;
a shield plate disposed at a position intersecting a straight line connecting the switching element and railway signal equipment installed on the ground;
Equipped with
The switching element is arranged such that a distance to the railway signal equipment is longer than a distance from the filter capacitor to the railway signal equipment.

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