JP3967613B2 - Uninterruptible power station for mobile radio base station - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an uninterruptible device for a mobile radio base station, and more particularly to an uninterruptible device for a mobile radio base station in which a large-capacity battery installed in the base station is downsized.
[0002]
[Prior art]
In a mobile communication system, for example, 500 to 600 mobile radio base stations are provided for each company in the Chugoku region to secure a communication area.
[0003]
FIG. 4 shows the configuration of a conventional mobile radio base station. 1 is a station building, 2 is an antenna, 3 is a wireless device, 4 is a DC power supply device, 5 is a large capacity battery, 6 is an air conditioner, and 7 is a three-phase or single-phase 200V AC power source supplied from a commercial power source. Communication between the radio base station and the mobile station is performed by the radio apparatus 3 using the antenna 2. The AC power supply 7 is supplied to the DC power supply 4 and the air conditioner 6 by directly or transforming commercial power. Further, the large-capacity battery 5 serving as a backup power source for power failure is charged from the DC power supply device 4. The air conditioner 6 is for maintaining the temperature and humidity in the station 1 within specified values.
[0004]
FIG. 5 shows an operation flow of a conventional mobile radio base station. When the operation starts, commercial power is input from the AC power source 7. When this commercial power supply starts up, the air conditioner 6 starts operation, and the DC power supply device 4 also starts operation. DC power is supplied from the DC power supply device 4 to the wireless device 3, and the wireless device 3 operates. Here, it is checked whether or not the large-capacity battery 5 is charged. When charging is necessary, the large-capacity battery 5 is charged from the DC power supply device 4 for a predetermined time. When the large-capacity battery 5 is sufficiently charged, charging is not performed. The operation flow so far is a normal operation.
[0005]
In such a mobile radio base station, when the commercial power supply fails, a power failure is detected and the operation flow in the case of a power failure is entered. When a power failure occurs, the air conditioner 6 stops operating, and the DC power supply 4 also stops operating. Accordingly, the DC power supply 4 is switched to the large capacity battery 5 to supply the DC power to the wireless device 3. In the event of a power failure, the wireless device 3 can operate for about 3 to 4 hours by a DC power supplied from the large-capacity battery 5. However, when the capacity of the large-capacity battery 5 is insufficient and the voltage drops, the operation of the wireless device 3 is stopped and the operation as a mobile wireless base station is stopped.
[0006]
Therefore, in order to continue the operation of the wireless device 3, it is necessary to carry the engine generator to the station building 1, and the station building 1 in the mountainous area has been difficult for uninterruptible operation. Therefore, communication is suddenly disconnected during connection. At the same time as the power failure, the air conditioner 6 stops operating, and the temperature and humidity in the station 1 cannot be maintained within the specified values, accelerating the shortage of the capacity of the large-capacity battery 5 or operating the mobile radio base station stably. Has an adverse effect.
[0007]
In addition, when it is desired to operate the mobile radio base station without a power failure, there is a method in which a large engine generator is provided and the drive power is supplied from the engine generator to the DC power supply device immediately after the commercial power supply fails.
[0008]
[Problems to be solved by the invention]
The above-described method of installing an engine generator and using it as a drive power source during a power failure requires a power generation output capacity that is 2 to 3 times that of a commercial power source with a margin of the characteristics inherent to the engine generator. An engine generator is required, which increases the size of the station itself. Also, switching between the engine generator and the commercial power source requires a large capacity switch, which increases the cost.
[0009]
In addition, the mobile radio base station shown in FIG. 4 requires an expensive large-capacity battery 5, and the cost of one station is an average of about 100 million yen. How many stations can be inexpensively expanded to expand the communication area. The result will be contrary to that.
[0010]
[Means for Solving the Problems]
The present invention has been made in view of the various problems described above. In the present invention, a wireless device, a DC power supply device that drives the wireless device, a commercial power supply that supplies a driving voltage to the DC power supply device, and the commercial power supply are provided. In a mobile radio base station that is driven by a power source and has an air conditioner that controls the temperature in the station, a small battery that is connected to the DC power source and is charged when the commercial power is supplied A small alternating current generator that works with the engine when the commercial power supply fails, and operates the small alternating current generator during a power failure to supply rectified direct current power directly to the wireless device. The combination of a small battery and a small alternator realizes an extremely small uninterruptible device for mobile radio base stations.
[0011]
Further, in the present invention, the small battery is characterized in that direct current power is directly supplied to the wireless device during a period until the small alternating current generator operates, and the mobile radio base station that realizes switching of the power source with an extremely small battery. We provide uninterruptible equipment.
[0012]
Furthermore, the present invention is characterized in that the rectified DC power supply is smoothed by a small battery and supplied to the wireless device, and provides an uninterruptible device for a mobile radio base station that also uses the small battery as a smoothing capacitor. It is.
[0013]
Further, the present invention is characterized in that the air conditioner is driven by an AC power source supplied from a small AC generator, and the small AC generator has no mobile radio base station having a capacity that can drive the air conditioner at least. We provide power failure equipment.
[0014]
Furthermore, in the present invention, the air conditioner is switched from a commercial power supply to the AC power supply with a changeover switch, and then restarted by giving an operation resumption command. We provide uninterruptible equipment for mobile radio base stations that make it possible.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to FIGS.
[0016]
FIG. 1 shows the configuration of a mobile radio base station of the present invention. 11 is a station building, 12 is an antenna, 13 is a radio device, 14 is a DC power supply device, 15 is a small capacity battery, 16 is an air conditioner, 17 is a three-phase or single-phase 200V AC power source supplied from a commercial power source, 18 Is a small AC generator, and 19 is a changeover switch.
[0017]
A feature of the present invention is that a small-capacity battery 15 is used as a backup power source in the event of a power failure, and a small AC generator 18 that works on an engine that generates power during a power failure is provided.
[0018]
When energized by the three-phase or single-phase 200 V AC power supply 17 supplied from the commercial power supply, the AC power is supplied from the commercial power supply 17 to the air conditioner 16 via the DC power supply device 14 and the changeover switch 19. Therefore, 20 to 50 volt DC power is supplied from the DC power supply device 14 to the wireless device 13, and the antenna 12 and the wireless device 13 are operated to perform communication between the wireless base station and the mobile station. The air conditioner 16 is for maintaining the temperature and humidity in the building 11 within specified values.
[0019]
The small-capacity battery 15 is designed to have a current capacity of about 1/4 to 1/6 (for example, 50 Ah) as compared with the conventional large-capacity battery, and is normally charged from the DC power supply device 14. The small alternator 18 is designed to have an output capacity of about 1/4 as compared with a conventional large engine alternator. By miniaturizing both, the station 11 can be made as small as possible.
[0020]
FIG. 2 shows a block diagram of a small AC generator 18. The small AC generator 18 includes an engine 21 and has a configuration in which the engine 21 and the power generator 22 are connected to generate AC power. Moreover, since this AC power supply is converted into a DC power supply by the rectifier 23, it can be called a DC generator / alternator. Since this small AC generator 18 has a small capacity, it has an advantage that it can generate power for a long time of about 3 days continuously depending on the fuel tank, and can operate as an uninterruptible device for a long-term mobile radio base station.
[0021]
In such a mobile radio base station, when the commercial power supply 17 fails, first, direct current power is supplied directly from the small capacity battery 15 to the radio apparatus 13. The capacity of the small capacity battery 15 is sufficient to supply the DC power supply 13 for about 10 minutes.
[0022]
On the other hand, when the commercial power source 17 fails, the AC voltage from the commercial power source 17 falls, so this is detected by the power failure detection unit 20 and the engine of the AC generator 18 is started by this power failure detection signal to start power generation. . The engine 21 of the small AC generator 18 supplies a stable AC power within a few seconds after starting. Accordingly, the DC power obtained by rectifying the AC power from the small AC generator 18 is directly supplied to the wireless device 13 before the DC voltage of the small capacity battery 15 decreases. Further, the DC power source from the small AC generator 18 is also connected to the small capacity battery 15, and smoothing of the DC power source is performed using the small capacity battery 15. For this reason, a smoothing capacitor or the like is not necessary, which can contribute to a reduction in the price of the station 11.
[0023]
In the present invention, the AC power generated from the small AC generator 18 is connected to the air conditioner 16 via the changeover switch 19. That is, when the AC power supply 17 is supplied from the commercial power supply, the commercial power supply 17 is supplied to the air conditioner 16 via the changeover switch 19. Next, when the commercial power supply fails, the air conditioner 16 stops its operation, but immediately detects the commercial power failure and the engine 21 of the small AC generator 18 starts to generate AC power. When this AC power source shifts to normal operation after the engine is started, the changeover switch 19 is switched to the generator side, and at the same time, an operation restart command is issued to the air conditioner 16 to operate the air conditioner 16. Further, when the commercial power supply recovers from the power failure, the operation of the air conditioner 16 is stopped and the changeover switch 19 is switched to the commercial power supply side again. Thereafter, an operation restart command is generated in the air conditioner 16, the operation of the air conditioner 16 is started by the AC power supply 17 from the commercial power supply, and the engine of the small AC generator 18 is stopped.
[0024]
Therefore, according to the present invention, the direct current power supplied to the wireless device 13 is extremely small, and the alternating current generator 18 can be downsized even if the power generation capacity capable of driving the air conditioner 16 is included.
[0025]
FIG. 3 shows an operation flow of the mobile radio base station of the present invention. When the operation starts, AC power is input from the commercial power source 17. When the commercial power supply 17 starts up, the air conditioner 16 starts operation, and the DC power supply apparatus 14 also starts operation. Direct current power is supplied from the direct current power supply device 14 to the wireless device 13, and the wireless device 13 operates. Here, it is checked whether or not the small-capacity battery 15 is charged. If charging is necessary, the small-capacity battery 15 is charged from the DC power supply device 14 for a predetermined time. If the small-capacity battery 15 is sufficiently charged, charging is not performed. The operation flow so far is a normal operation.
[0026]
In such a mobile radio base station, when the commercial power supply fails, the power failure detection unit 20 detects the power failure and enters the operation flow in the case of a power failure.
[0027]
When a power failure occurs, the air conditioner 16 stops operating, and the DC power supply 14 also stops operating. As a result, DC power is supplied from the small-capacity battery 15 to the wireless device 13. During this time, the engine 21 of the AC generator 18 is started to generate AC power. This AC power is rectified to a DC power by the rectifier 23 and immediately supplied to the wireless device 13, and the wireless device 13 continues to operate. The changeover switch 19 is also switched to the AC generator 18 side, AC power is supplied to the air conditioner 16, and the air conditioner 16 also resumes operation upon receiving an operation resumption command.
[0028]
When recovering from a power failure, it returns at the start and shifts to the normal operation flow described above. The changeover switch 19 is switched to the commercial power supply 17 side and stops the engine 21 of the AC generator 18.
[0029]
If it does not return for a long time after a power failure, the operation of the AC generator 18 is continued for the amount of fuel while confirming the presence or absence of fuel in the AC generator 18, and the operation as a mobile base station is continued. When the fuel runs out, the AC generator 18 stops operating due to lack of fuel, and the AC power generation stops. Thereafter, DC power is supplied from the small-capacity battery 15 to the wireless device 13 for a capacity, for example, about 10 minutes. When the voltage of the small-capacity battery 15 decreases, the operation of the wireless device 13 stops.
[0030]
Normally, power outages are often very short, and if the AC generator 18 is equipped with fuel for about 3 consecutive days, if there are actually 2 or 3 times of power outages over 3 hours per year, there will be about 1 year of uninterrupted power outage Driving is possible.
[0031]
【The invention's effect】
In the present invention, a wireless device, a DC power supply device that drives the wireless device, a commercial power supply that supplies a driving voltage to the DC power supply device, and an air conditioner that is driven by the commercial power supply and controls the temperature in the station building A small battery that is connected to the DC power supply and is charged when the commercial power is supplied, and a small AC that works on the engine when the commercial power fails It is characterized in that the small AC generator is operated in the event of a power failure and the rectified DC power is directly supplied to the wireless device, and it is extremely small in combination with a small battery and a small AC generator Uninterruptible power supply for mobile radio base stations.
[0032]
As a result, the large-capacity battery used in the past can be replaced with a small battery of about 1/4 to 1/6, greatly reducing the price of the battery, and extremely low maintenance costs for replacing the battery every 3 to 5 years. Can be reduced. Further, since the AC generator has a power supply capacity equivalent to that of the DC power supply device, it can be extremely miniaturized. In addition, it is possible to make the mobile radio base station uninterrupted in mountainous areas.
[0033]
In the present invention, the small battery is characterized in that direct current power is directly supplied to the wireless device during a period until the small AC generator operates normally, and there is an advantage that an extremely small battery can be used.
[0034]
Further, the present invention is characterized in that the rectified DC power supply is smoothed by a small battery and supplied to the wireless device, and there is an advantage that the small battery can be used as a smoothing capacitor.
[0035]
Furthermore, the present invention is characterized in that the air conditioner is driven by an AC power source supplied from a small AC generator, and the mobile radio base station can be operated in a stable environment.
[0036]
Furthermore, in the present invention, the air conditioner is switched from a commercial power supply to the AC power supply with a changeover switch, and then restarted by giving an operation resumption command. Can be made possible.
[Brief description of the drawings]
FIG. 1 is a block diagram for explaining an uninterruptible device of a mobile radio base station according to the present invention.
FIG. 2 is a block diagram for explaining a small-sized AC generator used in the present invention.
FIG. 3 is an operation flow diagram for explaining an uninterruptible device of a mobile radio base station according to the present invention.
FIG. 4 is a block diagram for explaining an embodiment of a conventional uninterruptible device for a mobile radio base station.
FIG. 5 is an operation flow diagram for explaining a conventional uninterruptible device of a mobile radio base station.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Station 12 Antenna 13 Radio | wireless apparatus 14 DC power supply 15 Small capacity battery 16 Air conditioner 17 Three-phase or single phase 200V AC power supply 18 supplied from commercial power supply Small AC generator 19 Changeover switch 20 Power failure detection circuit

Claims (3)

A wireless device installed in the station building;
A DC power supply provided in the station for driving the wireless device;
A commercial power supply for supplying a driving voltage to the DC power supply device;
In a mobile radio base station that is driven by the commercial power source and includes an air conditioner that controls the temperature in the station building,
A small AC generator having a small battery connected to the output side of the DC power supply device and charged when the commercial power is supplied, and an engine, a power generator and a rectifier that work when the commercial power supply fails And
During the period until the small AC generator starts operating at the time of a power failure, DC power is supplied from a small battery that has been downsized to a capacity capable of supplying DC power to the wireless device,
After the operation of the engine of the small AC generator is started, the DC power source generated by the power generator and rectified by the rectifier is smoothed by the small battery and supplied to the wireless device. Power failure device. A wireless device installed in the station building;
A DC power supply provided in the station for driving the wireless device;
A commercial power supply for supplying a driving voltage to the DC power supply device;
In a mobile radio base station that is driven by the commercial power source and includes an air conditioner that controls the temperature in the station building,
A small AC generator having a small battery connected to the output side of the DC power supply device and charged when the commercial power is supplied, and an engine, a power generator and a rectifier that work when the commercial power supply fails And
The small battery is downsized to a capacity capable of supplying DC power only to the wireless device during a period until the small AC generator starts to operate at the time of a power failure, and the DC power is supplied to the wireless device.
After the engine starts operating, the air conditioner is supplied with AC power generated by a power generator and DC power rectified by a rectifier is supplied to the wireless device. Power failure device.   3. The uninterruptible power station for a mobile radio base according to claim 2, wherein the air conditioner is restarted by giving an operation resumption command after being switched from the commercial power source to the AC power source by a changeover switch.

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