JP2022029499A - Power conversion device and air conditioner - Google Patents

Abstract

To provide a power conversion device to realize a situation where operations of at least certain air conditioners can be continued by power conversion devices having no abnormalities even when power supply through wiring stops and there are abnormalities in some of power conversion devices respectively provided to a plurality of air conditioners in a railway vehicle on which the air conditioners are mounted.SOLUTION: The power conversion device provided to the inside of each of a plurality of air conditioners mounted on a railway vehicle comprises: an AC/DC conversion unit that converts AC power supplied through wiring into DC power; and a DC/AC conversion unit that converts DC power supplied from the AC/DC conversion unit into AC power and outputs the AC power to a load of the air conditioner. When power supply through the wiring stops, a power supply source is switched from the wiring to a storage battery, and DC power supplied from the storage battery is converted into AC power by the DC/AC conversion unit and is output to the load of the air conditioner.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a power conversion device for an air conditioner of a railway vehicle, and an air conditioner to which the power converter is applied.

Railroad vehicles are generally equipped with a plurality of air conditioners that operate on AC power. These air conditioners are supplied with AC power that is taken in from the overhead wire by a current collector and stepped down by a transformer. In such a railroad vehicle, a storage battery may be provided in case the power supply from the overhead line is cut off. Storage batteries generally supply DC power. Therefore, for example, in the power conversion system of Patent Document 1, a power conversion device for converting DC power to AC power is provided in a railroad vehicle, and the DC power supplied from the storage battery is converted into AC power by the power conversion device to be an air conditioning device. It is output to the AC load such as.

JP-A-2017-225280

However, in the power conversion system of Patent Document 1, the DC power supplied from the storage battery is converted into AC power by a single power conversion device and supplied to a plurality of air conditioning devices. Therefore, if the power supply from the overhead wire is cut off and the air conditioner is driven by the storage battery, and an abnormality occurs in the power converter that converts the DC power of the storage battery to AC power, all the air conditioners will be the power supply source. There was a problem that it could not cope with the switching and the operation could not be continued.

The present disclosure solves the above-mentioned problems, and in a railroad vehicle equipped with a plurality of air conditioners, the power supply from the overhead line is interrupted, and among the power conversion devices provided in the plurality of air conditioners, respectively. Provided are a power conversion device and an air conditioning device capable of continuing the operation of at least a part of the air conditioning devices by the power conversion device in which the abnormality has not occurred even if an abnormality occurs in any of the power conversion devices. The purpose is.

The power conversion device according to the present disclosure is a power conversion device provided inside a plurality of air conditioning devices mounted on a railroad vehicle, and is an AC / DC conversion unit that converts AC power supplied from an overhead wire into DC power. It is equipped with a DC AC conversion unit that converts the DC power supplied from the AC / DC conversion unit and the DC power supplied from the storage battery mounted on the railroad vehicle into AC power and outputs it to the load of the air conditioner. When the power supply from the overhead wire is cut off, the conversion unit is supplied with the DC power of the storage battery.

Further, the air conditioner according to the present disclosure includes a power conversion device according to the present disclosure.

The power conversion device and the air conditioning device according to the present disclosure are configured as described above, so that the power supply from the overhead wire is cut off in the railway vehicle equipped with the plurality of air conditioning devices, and the power conversion device and the air conditioning device are further provided in each of the plurality of air conditioning devices. Even if an abnormality occurs in any of the power conversion devices, the operation of at least a part of the air conditioning devices can be continued by the power conversion device in which the abnormality does not occur.

It is a schematic diagram which shows the structure of the railroad vehicle which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the structure of the power conversion system which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the modification of the power conversion system which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the structure of the power conversion apparatus which concerns on Embodiment 1. FIG. It is a flowchart which shows the operation of the power conversion apparatus which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the structure of the modification 1 of the power conversion apparatus which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the structure of the modification 2 of the power conversion apparatus which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the structure of the power conversion apparatus which concerns on Embodiment 2. It is a schematic diagram which shows the structure of the power conversion apparatus which concerns on Embodiment 3. It is a schematic diagram which shows the structure of the modification of the power conversion apparatus which concerns on Embodiment 3. FIG. It is a schematic diagram which shows the structure of the modification of the power conversion apparatus which concerns on Embodiment 3. FIG.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the figure, the same or corresponding parts are designated by the same reference numerals. Further, in the description of the embodiment and the modified example, the description will be omitted or simplified as appropriate for the same or corresponding parts.

Embodiment 1.
FIG. 1 is a schematic view showing a configuration of a railroad vehicle according to the present embodiment. As shown in FIG. 1, in a railway vehicle, a plurality of air conditioners 3a and 3b are mounted on one vehicle 1. The air conditioners 3a and 3b are driven by the electric power supplied from the overhead wire 2. FIG. 1 shows an example in which a one-car train has two air conditioners 3a and 3b, but the number of air conditioners 3a and 3b possessed by a railroad vehicle is any number as long as it is two or more. May be good. For example, a two-car train may be configured to have one air conditioner 3 for each vehicle 1. That is, a plurality of air conditioners 3a and 3b may be mounted on the same vehicle, or may be distributed and mounted on a plurality of vehicles. Hereinafter, when the air conditioner 3a and the air conditioner 3b have the same configuration and the air conditioner 3a and the air conditioner 3b are not distinguished, they are simply referred to as the air conditioner 3.

Next, the power conversion system for railway vehicles will be described with reference to the drawings. FIG. 2 is a schematic diagram showing the configuration of the power conversion system according to the present embodiment. FIG. 3 is a schematic view showing a modified example of the power conversion system according to the present embodiment. FIG. 4 is a schematic diagram showing the configuration of the power conversion device according to the present embodiment.

As shown in FIG. 2, the power conversion system of a railroad vehicle is composed of a vehicle power supply circuit 4, an air conditioner 3, and a control unit 30 formed in the railroad vehicle.

The vehicle power supply circuit 4 has a transformer 5 and a storage battery 6, and supplies electric power to a plurality of air conditioners 3 mounted on a railway vehicle. The transformer 5 converts a high-voltage AC voltage of 25 kV supplied from the overhead wire 2 into an AC voltage of 440 V suitable for driving the air conditioner 3 and supplies the AC voltage to the air conditioners 3a and 3b, respectively. The storage battery 6 is an emergency power source mounted on a railroad vehicle in case the power supply from the overhead wire 2 is interrupted, and is precharged. The storage battery 6 supplies a DC voltage of 750 V suitable for driving the air conditioner 3 to the air conditioners 3a and 3b, respectively. The value of the high-voltage AC voltage supplied from the overhead wire 2, the value of the AC voltage supplied from the transformer 5 to the air conditioners 3a and 3b, and the value of the DC voltage supplied from the storage battery 6 to the air conditioners 3a and 3b are This is just an example, and is not limited to this.

The air conditioner 3 has a load 7 such as a compressor (CP) 8, an outdoor blower (CF) 9, and an indoor blower (EF) 10, and a power conversion device 11. Hereinafter, when the compressor 8, the outdoor blower 9, the indoor blower 10, and the like are not distinguished, these are collectively referred to as a load 7. The load 7 is driven by AC power supplied from the power conversion device 11. Details of the power conversion device 11 will be described later.

The control unit 30 controls the operation of the power conversion device 11. The control unit 30 may be configured by a microcomputer that reads and executes a program, a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or the like. It may be composed of. Note that FIG. 2 shows a configuration in which the control unit 30 is connected to the air conditioners 3a and 3b and a single control unit 30 controls the power conversion device 11 of the air conditioners 3a and 3b. A dedicated control unit 30 may be provided in 3a and 3b, and each control unit 30 may individually control the power conversion device 11. For example, as shown in FIG. 3, the control unit 51 may be provided inside the inverter device 52.

The details of the power conversion device 11 will be described with reference to FIG. The power conversion device 11 is provided inside the air conditioner 3, and includes an inverter device 12, a power supply switching device 13, and a voltage detection sensor 16. The power conversion device 11 is provided in each of the plurality of air conditioning devices 3 mounted on the railroad vehicle, and converts the electric power supplied from the vehicle power supply circuit 4 into AC power for driving the load 7 of the air conditioning device 3.

The inverter device 12 is connected to the transformer 5 by the first connection line 21, converts the AC power of the sine wave supplied from the overhead wire 2 and stepped down by the transformer 5 into a predetermined voltage and frequency, and outputs the AC power. Further, the inverter device 12 is connected to the storage battery 6 by the second connection line 22, and converts the DC power supplied from the storage battery 6 into AC power and outputs it. Details of the inverter device 12 will be described later with reference to another figure.

The power supply switching device 13 is provided between the vehicle power supply circuit 4 and the inverter device 12, and switches the power supply source for supplying electric power to the inverter device 12. The power supply source is an overhead wire 2 and a storage battery 6. The power supply switching device 13 includes a first switching unit 14 and a second switching unit 15. The first switching unit 14 and the second switching unit 15 are composed of switching elements and are switched between a state in which power is supplied (hereinafter also referred to as a supply state) and a state in which power is cut off (hereinafter also referred to as a cutoff state). Possible to be configured. Further, the first switching unit 14 and the second switching unit 15 are connected to the control unit 30 by a connection line (not shown), and the states of the first switching unit 14 and the second switching unit 15 are switched by the control unit 30. .. The first switching unit 14 and the second switching unit 15 are not limited to the switching element, and may be composed of a mechanical switch such as a switch and a contactor, or a semiconductor switch such as an IGBT.

The first switching unit 14 is provided on the first connection line 21 that connects the transformer 5 and the inverter device 12, and supplies AC power supplied from the overhead wire 2 and stepped down by the transformer 5 to the inverter device 12. It is possible to switch between the state and the cutoff state in which the supply of the AC power supplied from the overhead wire 2 and stepped down by the transformer 5 to the inverter device 12 is cut off. In other words, in the supply state, the overhead wire 2 and the inverter device 12 are electrically connected by the first switching unit 14, and in the cutoff state, the overhead wire 2 and the inverter device 12 are disconnected by the first switching unit 14.

The second switching unit 15 is provided on the second connection line 22 that connects the storage battery 6 and the inverter device 12, and is in a supply state in which the DC power output from the storage battery 6 is supplied to the inverter device 12 and is output from the storage battery 6. It is possible to switch to a cutoff state in which the supply of the DC power to the inverter device 12 is cut off. In other words, in the supply state, the storage battery 6 and the inverter device 12 are electrically connected by the second switching unit 15, and in the cutoff state, the storage battery 6 and the inverter device 12 are disconnected by the second switching unit 15.

The voltage detection sensor 16 is on the upstream side of the first switching unit 14 of the first connection line 21 connecting the transformer 5 and the inverter device 12, that is, on the transformer 5 side of the position where the first switching unit 14 is provided. It is installed at the position. The voltage detection sensor 16 detects the voltage value of the AC power supplied from the overhead wire 2 and stepped down by the transformer 5. Further, the voltage detection sensor 16 is connected to the control unit 30 by a connection line (not shown), and transmits the detected voltage value to the control unit 30.

The control unit 30 switches the states of the first switching unit 14 and the second switching unit 15 based on the voltage value detected by the voltage detection sensor 16. As a result, either the AC power supplied from the overhead wire 2 or the DC power supplied from the storage battery 6 is supplied to the inverter device 12. That is, the control unit 30 switches the power supply source to the inverter device 12 and the load 7.

With reference to FIG. 4, the configuration of the inverter device 12 of the power conversion device 11 of the present embodiment will be described in detail. The inverter device 12 converts the electric power supplied from the vehicle power supply circuit 4 into AC power for driving the load 7 of the air conditioner 3.

The inverter device 12 has an AC-DC conversion unit 17 that converts AC power into DC power, and a DC-AC conversion unit 18 that converts DC power into AC power. The AC power of the sine wave taken in from the overhead wire 2 and stepped down by the transformer 5 is supplied to the inverter device 12, and is converted into AC power having a predetermined voltage and frequency by the AC-DC conversion unit 17 and the DC-AC conversion unit 18. Will be done. The AC / DC converter 17 is also referred to as a converter circuit. The DC / AC conversion unit 18 is also referred to as an inverter circuit.

The AC / DC conversion unit 17 is connected to the transformer 5 by the first connection line 21 and is connected to the DC / AC conversion unit 18 by the third connection line 23. The AC / DC conversion unit 17 converts the AC power supplied from the transformer 5 into DC power. The DC power converted by the AC / DC conversion unit 17 is supplied to the DC / AC conversion unit 18.

The DC / AC conversion unit 18 is connected to the AC / DC conversion unit 17 by the third connection line 23, and is connected to the storage battery 6 by the second connection line 22. The DC / AC conversion unit 18 converts the DC power supplied from the AC / DC conversion unit 17 into AC power. Further, the DC / AC conversion unit 18 converts the DC power supplied from the storage battery 6 into AC power. The AC power converted by the DC / AC conversion unit 18 is supplied to the load 7 of the air conditioner 3. The load 7 is driven by AC power supplied from the DC AC conversion unit 18.

Next, the operation of the power conversion device 11 according to the present embodiment will be described with reference to FIG. FIG. 5 is a flowchart showing a switching process of the first switching unit 14 and the second switching unit 15 of the power conversion device 11 according to the present embodiment.

As shown in FIG. 5, first, the control unit 30 causes the voltage detection sensor 16 to start detecting the voltage value of the transformer 5, and acquires the voltage value detected by the voltage detection sensor 16 (step S1).

Next, the control unit 30 compares the voltage value detected by the voltage detection sensor 16 with a predetermined predetermined voltage value TH (step S2). The voltage value detected by the voltage detection sensor 16 is a voltage value based on the AC power of the overhead wire 2. Further, the predetermined voltage value TH is a value indicating that the AC power of the overhead wire 2 is lower than the allowable range.

When the voltage value detected by the voltage detection sensor 16 is equal to or higher than a predetermined voltage value TH (step S2: YES), the control unit 30 switches the first switching unit 14 to the supply state, and at the same time, the control unit 30 switches the first switching unit 14 to the supply state. The second switching unit 15 is switched to the cutoff state. As a result, the AC power taken in from the overhead wire 2 and stepped down by the transformer 5 is supplied to the AC / DC conversion unit 17 of the inverter device 12 through the first connection line 21. The AC power supplied to the AC / DC conversion unit 17 is converted into DC power by the AC / DC conversion unit 17, then converted into AC power by the DC / AC conversion unit 18, and supplied to each load 7. That is, the overhead wire 2 serves as a power supply source for the air conditioner 3.

On the other hand, when the voltage value detected by the voltage detection sensor 16 is less than a predetermined voltage value TH (step S2: NO), the control unit 30 switches the first switching unit 14 to the cutoff state. At the same time, the second switching unit 15 is switched to the supply state. As a result, the DC power supplied from the storage battery 6 is supplied to the DC / AC conversion unit 18 of the inverter device 12 through the second connection line 22. The DC power supplied to the DC / AC conversion unit 18 is converted into AC power by the DC / AC conversion unit 18 and supplied to each load 7. That is, the storage battery 6 serves as a power supply source for the air conditioner 3. The voltage value detected by the voltage detection sensor 16 is less than a predetermined predetermined voltage value TH when the power supply from the overhead wire 2 is cut off due to the influence of a power failure or a momentary power failure. In such a case, by switching the power supply source from the overhead wire 2 to the storage battery 6, each load 7 of the air conditioner 3 can be continuously driven.

With the above, the control unit 30 ends the switching process. The control unit 30 may start the next switching process immediately after the switching process is completed, or may start the next switching process after a predetermined time.

The power conversion device 11 according to the present embodiment described above is a power conversion device provided inside each of a plurality of air conditioning devices mounted on a railroad vehicle, and converts AC power supplied from an overhead wire into DC power. AC-DC conversion unit, DC power supplied from the AC-DC conversion unit, and DC power supplied from the storage battery mounted on the railroad vehicle are converted into AC power and output to the load of the air conditioner. The DC / AC conversion unit is configured to supply the DC power of the storage battery when the power supply from the overhead wire is cut off.

In this way, the power conversion device 11 is provided in each of the plurality of air conditioning devices 3 mounted on the railroad vehicle, and the DC power of the storage battery 6 is converted into AC power by the DC / AC conversion unit 18 of the power conversion device 11 to load 7. Therefore, even if an abnormality occurs in the power conversion device 11 of some of the air conditioning devices 3 among the plurality of air conditioning devices 3, if there is an air conditioning device 3 in which the power conversion device 11 does not have an abnormality, The air conditioning device 3 can continue the air conditioning of the vehicle interior. Further, in the railroad vehicle equipped with the power conversion device 11 of the present embodiment, an abnormality has occurred in some of the power conversion devices 11 due to the application of the redundant configuration in which the power conversion device 11 is provided for each air conditioning device 3. Even so, not all the air conditioning devices 3 are stopped.

Further, the storage battery is directly connected to the DC AC conversion unit 18 of the inverter device 12 provided inside each air conditioner 3 for the purpose of converting the AC power of the sinusoidal wave supplied from the overhead wire 2 into a predetermined voltage and frequency. In order to supply the DC power of No. 6, it is not necessary to separately provide a DC-AC conversion unit for converting the DC power of the storage battery 6 into AC power, as in Patent Document 1. As a result, the weight of the power supply circuit can be reduced as compared with the case where the DC AC conversion unit for converting the DC power of the storage battery 6 into AC power is separately provided outside the air conditioner 3 as in Patent Document 1. can.

Further, the power conversion device 11 according to the present embodiment is provided on the connection line connecting the overhead wire and the AC / DC conversion unit, and can be switched between a cutoff state in which the AC power of the overhead wire is cut off and a supply state in which the AC power is supplied. A second switching unit is provided on the connection line connecting the storage battery and the DC / AC conversion unit, and can switch between a cutoff state in which the DC power of the storage battery is cut off and a supply state in which the DC power is supplied. This makes it possible to switch the power supply source to the power conversion device.

Further, in the power conversion device 11 according to the present embodiment, when the power supply from the overhead wire is not cut off, the first switching unit is switched to the conductive state and the second switching unit is switched to the cutoff state to switch the overhead wire. When the power supply from the power supply is cut off, the control unit is provided to switch the first switching unit to the cutoff state and the second switching unit to the conduction state. As a result, the power supply source to the power conversion device can be switched according to the state of power supply from the overhead line.

Further, the control unit of the power conversion device 11 according to the present embodiment sets the first switching unit when the detection value of the voltage detection sensor that detects the voltage value based on the AC power supplied from the overhead wire is equal to or higher than a predetermined value. While switching to the conduction state, the second switching unit is switched to the cutoff state, and when the detection value of the voltage detection sensor is less than the predetermined value, the first switching unit is switched to the cutoff state and the second switching unit is switched to the conduction state. ..

In this way, since the states of the first switching unit and the second switching unit are switched based on the detection result of the voltage detection sensor, the power of the air conditioner 3 is changed according to the change of the AC power supplied from the overhead wire 2. The supply source can be switched quickly.

In the power conversion device 11 of the present embodiment, the configuration in which the first switching unit 14 and the second switching unit 15 are mounted on the same power supply switching device 13 has been described, but different power supply switching devices 13a and 13b have been described. It may be installed. FIG. 6 is a schematic view showing the configuration of modification 1 of the power conversion device of the present embodiment. FIG. 7 is a schematic view showing the configuration of modification 2 of the power conversion device of the present embodiment.

As shown in FIG. 6, the power conversion device 11a includes a power supply switching device 13a on which the first switching unit 14 is mounted and a power supply switching device 13b on which the second switching unit 15 is mounted. That is, the first switching unit 14 and the second switching unit 15 are mounted on different power supply switching devices 13a and 13b.

Further, as shown in FIG. 7, the air conditioners 3a and 3b may be configured to include power conversion devices 11 and 11a having different configurations of the power supply switching devices 13 and 13a. That is, the air-conditioning device 3a includes a power conversion device 11 in which the first switching unit 14 and the second switching unit 15 are mounted on the same power supply switching device 13, and the air-conditioning device 3b includes the first switching unit 14 and the second switching unit 14. The switching unit 15 may be provided with a power conversion device 11a mounted on different power supply switching devices 13a and 13b.

According to the power conversion device 11a of the modification 1 and the modification 2 of the present embodiment, the redundancy of the power conversion device 11a can be further improved.

Embodiment 2.
In the first embodiment, the configuration in which one inverter device 12 has one DC / AC conversion unit 18 has been described, but in the second embodiment, one inverter device 32 has two DC / AC conversion units. Is different from Form 1. Hereinafter, a configuration different from that of the first embodiment will be mainly described.

The configuration of the inverter device 32 of the power conversion device 31 according to the present embodiment will be described. FIG. 8 is a schematic view showing the configuration of the power conversion device 31 according to the second embodiment.

As shown in FIG. 8, the inverter device 32 has a first DC / AC conversion unit 18a and a second DC / AC conversion unit 19.

The first DC / AC conversion unit 18a is connected to the AC / DC conversion unit 17 by the third connection line 23 and is connected to the storage battery 6 by the second connection line 22, similarly to the DC / AC conversion unit 18 of the first embodiment. Will be done. The first DC / AC conversion unit 18a converts the DC power supplied from the AC / DC conversion unit 17 into AC power. Further, the first DC AC conversion unit 18a converts the DC power supplied from the storage battery 6 into AC power. The AC power converted by the first DC AC conversion unit 18a is supplied to the indoor blower 10 of the air conditioner 3.

The second DC / AC conversion unit 19 is connected to the AC / DC conversion unit 17 by the fourth connection line 24. The second DC / AC conversion unit 19 converts the DC power supplied from the AC / DC conversion unit 17 into AC power. The AC power converted by the second DC AC conversion unit 19 is supplied to the compressor 8 of the air conditioner 3 and the outdoor blower 9.

Next, the operation of the power conversion device 31 according to the present embodiment will be described.

When the voltage value detected by the voltage detection sensor 16 is equal to or higher than a predetermined voltage value TH, the control unit 30 switches the first switching unit 14 to the supply state and shuts off the second switching unit 15. Switch to. As a result, the AC power taken in from the overhead wire 2 and stepped down by the transformer 5 is supplied to the AC / DC conversion unit 17 of the inverter device 32 through the first connection line 21. The AC power supplied to the AC / DC conversion unit 17 is converted into DC power by the AC / DC conversion unit 17, then converted into AC power by the first DC / AC conversion unit 18a, and supplied to the indoor blower 10. Further, the AC power supplied to the AC / DC conversion unit 17 is converted into DC power by the AC / DC conversion unit 17, and then converted into AC power by the second DC / AC conversion unit 19, and is converted into the AC power by the compressor 8 and the outdoor blower. It is supplied to 9.

On the other hand, when the voltage value detected by the voltage detection sensor 16 is less than a predetermined voltage value TH, the control unit 30 switches the first switching unit 14 to the cutoff state and switches the second switching unit 15 to the cutoff state. Switch to the supply state. As a result, the DC power supplied from the storage battery 6 is supplied to the first DC AC conversion unit 18a of the inverter device 32 through the second connection line 22. The DC power supplied to the first DC AC conversion unit 18a is converted into AC power by the first DC AC conversion unit 18a and supplied to the indoor blower 10.

According to the present embodiment, when the electric power is supplied from the overhead wire 2, the compressor 8, the outdoor blower 9, and the indoor blower 10 are driven by the electric power supplied from the overhead wire 2. On the other hand, when the power supply from the overhead wire 2 is cut off, the indoor blower 10 is driven by the power supplied from the storage battery 6.

Generally, the power consumption of the compressor of the air conditioner is higher than the power consumption of the blower. Therefore, even if the capacity of the storage battery is small and it is difficult to drive the compressor with the storage battery, it may be possible to drive the blower. According to this embodiment, even when the capacity of the storage battery 6 is small, the indoor blower 10 can be driven by the electric power supplied from the storage battery 6.

According to the power conversion device 31 according to the present embodiment described above, the DC power supplied from the AC / DC conversion unit and the DC power supplied from the storage battery are converted into AC power and output to the indoor blower of the air conditioner. It is configured to include a first DC / AC conversion unit and a second DC / AC conversion unit that converts DC power supplied from the AC / DC conversion unit into AC power and outputs the DC power to the compressor of the air conditioner.

As a result, even if the capacity of the storage battery 6 is small and it is impossible for the storage battery 6 to drive the entire air conditioner 3 when the power supply from the overhead wire 2 is cut off, the storage battery 6 can be used for the indoor blower 10. It can be driven and maintain the comfort of the passenger compartment. Further, the indoor blower 10 can be driven for a longer time as compared with the case where the compressor 8, the outdoor blower 9, and the indoor blower 10 are driven by the storage battery 6.

Embodiment 3.
In the second embodiment, the configuration in which the second DC AC conversion unit 19 to which the DC power of the storage battery 6 is not supplied is provided in the inverter device 32 has been described, but in the third embodiment, instead of the second DC AC conversion unit 19. The second DC AC conversion unit 20 to which the DC power of the storage battery 6 is always supplied is provided in the inverter device 34, which is different from the first and second embodiments. Hereinafter, configurations different from those of the first embodiment and the second embodiment will be mainly described.

The configuration of the inverter device 34 of the power conversion device 33 according to the present embodiment will be described. FIG. 9 is a schematic view showing the configuration of the power conversion device 33 according to the third embodiment.

As shown in FIG. 9, the inverter device 34 has a first DC / AC conversion unit 18b and a second DC / AC conversion unit 20.

The first DC / AC conversion unit 18b is connected to the AC / DC conversion unit 17 by the third connection line 23 and is connected to the storage battery 6 by the second connection line 22, similarly to the DC / AC conversion unit 18 of the first embodiment. Will be done. The first DC / AC conversion unit 18b converts the DC power supplied from the AC / DC conversion unit 17 into AC power. Further, the first DC AC conversion unit 18b converts the DC power supplied from the storage battery 6 into AC power. The AC power converted by the first DC AC conversion unit 18b is supplied to the compressor 8 of the air conditioner 3 and the outdoor blower 9.

The second DC / AC conversion unit 20 is always connected to the storage battery 6 by the fifth connection line 25. The AC power converted by the second DC AC conversion unit 20 is supplied to the indoor blower 10 of the air conditioner 3.

Next, the operation of the power conversion device 33 according to the present embodiment will be described.

When the voltage value detected by the voltage detection sensor 16 is equal to or higher than a predetermined voltage value TH, the control unit 30 switches the first switching unit 14 to the supply state and shuts off the second switching unit 15. Switch to. As a result, the AC power taken in from the overhead wire 2 and stepped down by the transformer 5 is supplied to the AC / DC conversion unit 17 of the inverter device 34 through the first connection line 21. The AC power supplied to the AC / DC converter 17 is converted into DC power by the AC / DC converter 17, then converted into AC power by the first DC AC converter 18b, and is converted into the compressor 8 and the outdoor blower 9. Will be supplied.

On the other hand, when the voltage value detected by the voltage detection sensor 16 is less than a predetermined voltage value TH, the control unit 30 switches the first switching unit 14 to the cutoff state and switches the second switching unit 15 to the cutoff state. Switch to the supply state. As a result, the DC power supplied from the storage battery 6 is supplied to the first DC AC conversion unit 18b of the inverter device 34 through the second connection line 22. The DC power supplied to the first DC AC conversion unit 18b is converted into AC power by the first DC AC conversion unit 18b and supplied to the compressor 8 and the outdoor blower 9. That is, when the power supply from the overhead wire 2 is cut off due to the influence of a power failure or a momentary power failure, the power supply source is switched from the overhead wire 2 to the storage battery 6, and the compressor 8 and the outdoor blower 9 are from the storage battery 6. Driven by power supply.

The second DC AC conversion unit 20 constantly converts the DC power supplied from the storage battery 6 into AC power and supplies it to the indoor blower 10, regardless of the voltage value detected by the voltage detection sensor 16. That is, the indoor blower 10 is always operated by the power supply from the storage battery 6 regardless of the state of the power supply from the overhead wire 2.

The power conversion device 33 according to the present embodiment described above converts the DC power supplied from the AC / DC conversion unit and the DC power supplied from the storage battery when the power supply from the overhead wire is cut off into AC power. It is provided with a first DC AC converter that outputs to the compressor of the air conditioner and a second DC AC converter that converts the DC power constantly supplied from the storage battery into AC power and outputs it to the indoor blower of the air conditioner. It is composed.

In this way, since electric power is always supplied from the storage battery 6 to the indoor blower 10, the indoor blower 10 is maintained in an operating state regardless of the state of power supply from the overhead wire 2, and the comfort of the vehicle interior is maintained. be able to.

Although the power conversion device 33 of the third embodiment includes the voltage detection sensor 16 for detecting the state of the AC power of the overhead wire 2, the voltage detection sensor 16 may be omitted. FIG. 10 is a schematic diagram showing a configuration of a modified example of the power conversion device according to the third embodiment.

As shown in FIG. 10, in the power conversion device 35 in which the voltage detection sensor 16 is omitted, the commander or the like who recognizes that the power supply of the overhead wire 2 is interrupted is the first switching unit mounted on the power switching device 13. The 14 and the second switching unit 15 are manually operated to start the power supply from the storage battery 6 to the load 7.

According to the modification of the third embodiment, the indoor blower 10 is constantly supplied with electric power from the storage battery 6 and maintained in an operating state. Therefore, even if the drive of the compressor 8 and the outdoor blower 9 is stopped from the time when the power supply to the compressor 8 and the outdoor blower 9 is stopped until the power supply to the outdoor blower 9 is restarted by the conductor or the like, the indoor blower 10 Since the driving is continued, the comfort in the vehicle 1 is not easily impaired.

In the power conversion devices of the first and second embodiments, the voltage detection sensor 16 is omitted and the power supply from the overhead wire 2 is cut off, as in the modification of the third embodiment. The commander or the like may manually operate the power supply switching device 13 to switch the power supply source to the storage battery 6.

Further, in the power conversion device according to the first to third embodiments, the control unit 30 receives an external signal such as a section detection signal instead of the voltage value detected by the voltage detection sensor 16, and receives the external signal. It may be configured to switch the power supply source based on the signal. As a result, the same effects as those of the first to third embodiments can be obtained.

Further, the power conversion device according to the first to third embodiments may be configured to include a capacitor voltage detection circuit (not shown) built in the inverter device instead of the voltage detection sensor 16. The control unit 30 switches the power supply source based on the detection value of the capacitor voltage detection circuit. As a result, the same effects as those of the first to third embodiments can be obtained.

Further, in the power conversion device according to the first to third embodiments, the configuration in which the first switching unit 14, the second switching unit 15, and the voltage detection sensor 16 are arranged inside the power conversion device has been described. The first switching unit, the second switching unit, and the voltage detection sensor may be arranged outside the air conditioner. FIG. 11 is a schematic view showing the configuration of a power conversion device 41 in which a power supply switching device 43 equipped with a first switching unit 44 and a second switching unit 45 and a voltage detection sensor 46 are arranged outside the air conditioning device 3. Is.

As shown in FIG. 11, the power supply switching device 43 on which the first switching unit 44 and the second switching unit 45 are mounted and the voltage detection sensor 46 are provided for each power conversion device 41, and are provided outside the air conditioning device 3. For example, it is placed in an empty space of a vehicle. The switching of the supply of the power supply source for supplying power to the power conversion device 41 is performed individually as in the power conversion device of the first to third embodiments. As a result, the same effects as those of the first to third embodiments can be obtained.

Various embodiments and variations are possible without departing from the broad spirit and scope of the present disclosure. Moreover, the above-described embodiment is for explaining the present disclosure, and does not limit the scope of the present disclosure. The scope of the present disclosure is set forth in the claims, not in the embodiments. Various modifications made within the scope of the claims and within the equivalent meaning of the disclosure are deemed to be within the scope of the present disclosure.

1 vehicle, 2 overhead wire, 3 air conditioner, 3a air conditioner, 3b air conditioner, 4 vehicle power supply circuit, 5 transformer, 6 storage battery, 7 load, compressor, 9 outdoor blower, 10 indoor blower, 11 power converter, 12 Inverter device, 13 power supply switching device, 14 1st switching unit, 15 2nd switching unit, 16 voltage detection sensor, 17 AC / DC conversion unit, 18 DC AC conversion unit, 18a 1st DC AC conversion unit, 19 2nd DC AC Conversion unit, 20 2nd DC AC conversion unit, 21 1st connection line, 22 2nd connection line, 23 3rd connection line, 24 4th connection line, 25 5th connection line, 30 control unit, 33 power conversion device, 34 Inverter device, 35 Power conversion device, 41 Power conversion device, 43 Power supply switching device, 44 1st switching unit, 45 2nd switching unit, 46 Voltage detection sensor, 51 Control unit, 52 Inverter device.

Claims (8)

It is a power conversion device installed inside multiple air conditioners mounted on railway vehicles.
An AC / DC converter that converts AC power supplied from overhead lines into DC power,
It is provided with a DC / AC conversion unit that converts DC power supplied from the AC / DC conversion unit and DC power supplied from a storage battery mounted on the railway vehicle into AC power and outputs the DC power to the load of the air conditioner.
The DC / AC conversion unit is a power conversion device characterized in that the DC power of the storage battery is supplied when the power supply from the overhead line is cut off. A first switching unit provided on the connection line connecting the overhead wire and the AC / DC conversion unit and capable of switching between a cutoff state for cutting off the AC power of the overhead line and a supply state for supplying the overhead line.
A second switching unit is provided on a connection line connecting the storage battery and the DC / AC conversion unit, and can be switched between a cutoff state for cutting off the DC power of the storage battery and a supply state for supplying the storage battery. The power conversion device according to claim 1. When the power supply from the overhead wire is not cut off, the first switching unit is switched to the conductive state and the second switching unit is switched to the cutoff state, and the power supply from the overhead wire is cut off. The power conversion device according to claim 2, further comprising a control unit for switching the first switching unit to the cutoff state and switching the second switching unit to the conduction state. The control unit
When the detection value of the voltage detection sensor that detects the voltage value based on the AC power supplied from the overhead wire is equal to or higher than a predetermined value, the first switching unit is switched to the conduction state and the second switching unit is switched to the cutoff state. switching,
The power conversion according to claim 3, wherein when the detection value of the voltage detection sensor is less than a predetermined value, the first switching unit is switched to the cutoff state and the second switching unit is switched to the conduction state. Device. The power conversion device according to claim 3, wherein the control unit switches the states of the first switching unit and the second switching unit based on an external signal received by the railway vehicle. The DC / AC converter
A first DC AC conversion unit that converts DC power supplied from the AC / DC conversion unit and DC power supplied from the storage battery into AC power and outputs the DC power to the indoor blower of the air conditioner.
Any of claims 1 to 5, further comprising a second DC / AC conversion unit that converts DC power supplied from the AC / DC conversion unit into AC power and outputs the DC power to the compressor of the air conditioner. The power conversion device according to item 1. The DC / AC converter
When the DC power supplied from the AC / DC conversion unit and the power supply from the overhead wire are cut off, the DC power supplied from the storage battery is converted into AC power and output to the compressor of the air conditioner. AC conversion unit and
One of claims 1 to 5, characterized in that it includes a second DC AC conversion unit that converts DC power constantly supplied from the storage battery into AC power and outputs the DC power to the indoor blower of the air conditioner. The power conversion device described in the section. An air conditioner including the power conversion device according to any one of claims 1 to 7.

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