JP2013085329A - Power source device for catv system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a power source device for a CATV system which achieves high reliability, low cost, and high efficiency.SOLUTION: A power source device for a CATV system 100 is inserted into a coaxial cable located near a load and has a charger 10, a storage battery 11, an inverter 12, and a switch 13. The charger 10 connects with the switch 13. The storage battery 11 connects with the switch 13 through the inverter 12. The switch 13 connects the coaxial cable side with the charger 10 when electric power is supplied from a commercial power source and alternating current power is supplied to the coaxial cable and connects the coaxial cable side with the inverter 12 when the commercial power source breaks down.

Description

  The present invention relates to a power supply apparatus for a CATV system that supplies power to a load such as an amplifier during a power failure in a CATV system.

  In a CATV system that uses a coaxial cable as a transmission line, power is supplied to a load such as a trunk amplifier via a coaxial cable with a commercial power supply lowered to 60V. Here, a UPS (uninterruptible power supply) is provided so that power can be supplied even when the commercial power supply fails. An example of a conventional UPS configuration is shown in FIG. As shown in FIG. 5, the conventional UPS is connected to a commercial power supply of AC 100 V, and is stepped down to AC 60 V and output, a charger 2 connected to the commercial power supply, and a storage battery charged by the charger 2. 3, an inverter 4 that converts DC power from the storage battery 3 into AC 60 V AC power and outputs it, and a switch 5 that switches between outputting power from the transformer 1 side or outputting power from the inverter 4 side, It is constituted by. When commercial power is supplied, AC 100V AC power is stepped down to AC 60V by the transformer 1 and output, superimposed on the coaxial cable, and part of AC 100V AC power is input to the charger 2. The storage battery 3 is charged. On the other hand, when the commercial power supply fails, the DC power from the storage battery 3 is converted into AC 60V AC power by the inverter 4 and superimposed on the coaxial cable.

  In addition, the UPS for the CATV system disclosed in Patent Documents 1 and 2 is known. Patent Document 1 has a solar cell and a voltage stabilizing device, not charged by a commercial power source, and converts the electric power generated by the solar cell into a voltage suitable for charging by the voltage stabilizing device. A UPS for a CATV system that charges a storage battery with electric power from a converter is shown. Thus, it is described that the amount of power used can be reduced and the amount of heat generated is small, so that deterioration of the storage battery can be suppressed.

  Patent Document 2 shows a UPS for a CATV system in which a temperature detection unit and a heating unit are further provided in the conventional UPS shown in FIG. 5 to control the temperature of the storage battery, thereby suppressing the temperature dependence of the capacity of the storage battery. Has been. As a result, the rated operation of the storage battery is ensured, and it is not necessary to use a large storage battery in preparation for temperature drop, so the UPS can be reduced in size and cost, and the storage battery can be efficiently heated. It is described.

JP 11-150889 A JP 2002-345169 A

  In the conventional UPS and the UPS for the CATV system described in Patent Documents 1 and 2, power is supplied to a plurality of loads by one unit, and this one UPS covers an area of about 200 households. As a result, if there is a problem with the UPS and power cannot be supplied in the event of a power failure, the service by the CATV system cannot be used due to a stop in a wide area. As described above, the conventional UPS and the UPS for the CATV system disclosed in Patent Documents 1 and 2 have a very high risk of failure.

  Moreover, the convenience of supplying electric power to a plurality of loads, the transmission distance from the UPS to a certain load becomes long, and the efficiency deteriorates due to the loss in the electric transmission path.

  Further, the storage battery is large in order to supply electric power to a plurality of loads, and therefore the UPS is also large. For this reason, there is a problem that the place where the UPS is installed is limited, and it is necessary to install the UPS using dedicated equipment, which is costly.

  SUMMARY OF THE INVENTION An object of the present invention is to realize a CATV system power supply apparatus that is highly reliable, low in cost, and high in efficiency, and to realize a CATV system using the CATV system power supply apparatus.

  A first aspect of the present invention is a CATV system power supply apparatus that is used in a CATV system in which commercial power is stepped down and supplied to a load via an electric transmission line, and that supplies power to the load when a commercial power failure occurs. When commercial power is supplied via a charger, a charger into which a part of the commercial power is input, a storage battery that is stored under the control of the charger and outputs DC power, and DC power from the storage battery is AC When commercial power is supplied via an inverter that converts power into electric power and an electric transmission line, the electric transmission line is connected to the input side of the charger, and the commercial power is out of power. Is a power supply apparatus for a CATV system, characterized by having a switch for switching between the electric transmission line and the output side of the inverter.

  The second invention is used in a CATV system in which commercial power is stepped down and transmitted to an electric transmission line. In a CATV system power supply device that supplies electric power to a load, the commercial power is supplied via the electric transmission line. A rectifier that converts a part of the commercial power into DC power, a charger that receives a part of the commercial power when the commercial power is supplied via an electrical and electrical transmission line, and a charger In the case where commercial power is supplied via a storage battery that is stored by the control of and outputs direct current power and an electric transmission line, the output side of the rectifier and the load are connected to supply direct current power to the load, A switch for connecting the output side of the storage battery to the load and switching so as to supply DC power to the load when the commercial power is interrupted; so That.

  A third invention is used in a CATV system in which commercial power is stepped down and supplied to a load via an electric transmission line. In a CATV system power supply apparatus that supplies power to a load when a commercial power failure occurs, power is generated by light. A solar battery that outputs DC power, a charger that receives DC power from the solar battery, a storage battery that is stored under the control of the charger and outputs DC power, and converts the DC power from the storage battery into AC power And an inverter that outputs to the electric transmission line.

  In the first to third aspects of the invention, the load is used in, for example, a bidirectional trunk amplifier, a bidirectional trunk branch amplifier, a bidirectional trunk distribution amplifier, a bidirectional amplifier, a bidirectional branch amplifier, or an HFC or FTTC CATV system. Such as an optical node.

  The CATV system according to the present invention is not limited to the one that uses only an electric transmission line (coaxial cable) as a transmission line, but is also an HFC or FTTC type CATV system that uses an optical transmission line (optical fiber cable) and an electric transmission line. Can also be applied.

  Also, normally, commercial power of 100V is stepped down to 60V by a transformer and supplied to the transmission line for transmission. The supply range of commercial power by this transmission line is for loads of about 5 to 10 units.

  In addition, the CATV system power supply apparatus according to the first to third aspects of the invention does not necessarily supply power to only one load, and supplies power to a plurality of loads equal to or less than the number of loads supplied by a conventional UPS. However, in order to increase the size and cost of the apparatus, it is desirable to install so as to supply power to only one load.

  The CATV system power supply apparatus according to the first to third aspects of the invention may be used in combination with a conventional UPS (uninterruptible power supply apparatus). Although the installation cost and the like increase by providing the conventional UPS, it is possible to extend the drive time of the load at the time of a power failure, and it is possible to further improve the reliability of the CATV system.

  According to a fourth aspect of the present invention, in the first to third aspects of the invention, the storage battery is a lithium ion secondary battery or a nickel metal hydride battery.

  According to a fifth aspect of the present invention, there is provided a CATV system characterized in that the CATV system power supply device according to the first to fourth aspects of the present invention is installed for each load.

  According to 1st invention, since it can install adjacent to each load, there is little transmission loss by an electric transmission path, and it can supply electric power to a load efficiently at the time of a power failure. Moreover, in the conventional uninterruptible power supply, a large area stops when the uninterruptible power supply cannot supply power due to a malfunction or the like because electric power is supplied to a plurality of loads. Since power can be supplied to the load, the area where the wave stops is limited even if power cannot be supplied due to a malfunction or the like, and the risk can be dispersed. Moreover, in 1st invention, since electric power can be supplied to each load, the capacity | capacitance of a storage battery can be reduced compared with the past, and a small thing can be used. Therefore, it is possible to reduce the size of the apparatus, increase the degree of freedom of places where installation is possible, and reduce installation costs.

  Further, in the second invention, the same effect as that of the first invention can be obtained, and the direct-current power is directly transmitted to the load, so that the power can be efficiently supplied to the load at the time of a power failure. Moreover, since it is not necessary to provide the power supply device which converts alternating current power into direct current power on the load side, the cost of the load can be reduced.

  In the third invention, the same effect as that of the first invention can be obtained, and the storage battery is charged by the solar battery rather than charging the storage battery by using a part of the commercial power. The amount can be reduced.

  Moreover, since the power supply apparatus for CATV systems of the first to third inventions is separated from the transformer, it can be installed at an arbitrary position on the electric transmission path. Therefore, the installation cost of the power supply device for CATV system can be reduced.

  Further, as in the fourth invention, the CATV system power supply device of the present invention does not supply power to a large number of loads, so that a storage battery having a relatively small capacity can be used. A lithium ion secondary battery or a nickel metal hydride battery can be used instead of the lead storage battery that has been used. Therefore, the CATV system power supply device can be reduced in weight and size, the degree of freedom of the installation location of the CATV system power supply device can be increased, and the installation cost can be reduced.

  In addition, according to the fifth aspect, the reliability of the CATV system can be further increased, and the CATV system can be operated at a lower cost.

The figure which showed the structure of the power supply device for CATV systems of Example 1. FIG. The figure which showed the structure of the CATV system using the power supply device for CATV systems of Example 1. FIG. The figure which showed the structure of the power supply device for CATV systems of Example 2. FIG. The figure which showed the structure of the power supply device for CATV systems of Example 3. FIG. The figure which showed the structure of the conventional UPS.

  Hereinafter, specific examples of the present invention will be described with reference to the drawings. However, the present invention is not limited to the examples.

  FIG. 1 shows a power supply device 100 for a CATV system according to the first embodiment. The CATV system power supply device 100 according to the first embodiment includes a charger 10, a storage battery 11, an inverter 12, a switch 13, and coaxial cable terminals 14A and 14B.

  The coaxial cable terminals 14A and B are each connected to a coaxial cable. As a result, the CATV system power supply apparatus 100 is inserted into the coaxial cable. In the coaxial cable, AC power obtained by reducing 100 V commercial power from a commercial power source to 60 V by a transformer is superimposed and transmitted. A capacitor 15 is provided between the coaxial cable terminals 14A and 14B, and inductors 16 and 17 are provided between a point a between the coaxial cable terminal 14A and the capacitor 15 and a point b between the coaxial cable terminal 14B and the capacitor 15. It is connected. Further, a point c between the inductor 16 and the inductor 17 and the switch 13 are connected. With this configuration, part of the power from the coaxial cable is transmitted to the switch 13.

  The charger 10 is connected to the switch 13. The rechargeable battery 10 operates so as to convert a part of the AC power from the coaxial cable into DC power and supply the DC power to the storage battery 11 for charging.

  The storage battery 11 is, for example, a lead storage battery, a lithium ion secondary battery, a lithium ion polymer secondary battery, or a nickel metal hydride battery. Among them, it is particularly preferable to use a battery other than the lead storage battery. This is because the CATV system power supply device 100 according to the first embodiment is installed for each load, and thus it is not necessary to use a large capacity storage battery 11. As a result, the storage battery 20 can be reduced in size and weight, and as a result, the CATV system power supply device 100 itself can be reduced in size and weight. Even when a lead storage battery is used, a battery having a capacity of about 1/4 that of a lead storage battery used in a conventional UPS can be used. For these reasons, the storage battery 20 can be reduced in size and weight, and as a result, the CATV system power supply device 100 itself can be reduced in size and weight. As a result, the degree of freedom of places where the CATV system power supply apparatus 100 can be installed is increased, and the installation cost can be reduced.

  The inverter 12 is connected to the storage battery 11. The inverter 12 converts DC power from the storage battery 11 into AC power and outputs the AC power to the switch 13.

  The switch 13 switches a connection between the point c between the inductor 16 and the inductor 17 and the charger 10 and a connection between the point c and the inverter 12. In this switching control, when commercial power is supplied from a commercial power source and AC power is transmitted through the coaxial cable, the point c and the charger 10 are connected, the commercial power source fails and the coaxial cable is connected. When the AC power is not transmitted, control is performed so as to connect between the point c and the inverter 12. Such control is possible, for example, depending on whether or not AC power is transmitted between the coaxial cable terminal 14A and the coaxial cable terminal 14B. That is, when AC power is transmitted between the coaxial cable terminal 14A and the coaxial cable terminal 14B, the information is fed back to the switch 13 so that the point c and the charger 10 are connected. If the AC power is not transmitted between the coaxial cable terminal 14A and the coaxial cable terminal 14B, the information is fed back to the switch 13 to connect the point c and the inverter 12. Control.

  Further, in the switching control of the switch 13, it is necessary to devise switching control so that the power from the CATV system power supply device 100 does not charge another CATV system power supply device 100. In other words, in the above configuration, when a plurality of CATV system power supply devices 100 are connected in series, the downstream CATV system power supply device 100 is supplied with power from a commercial power source or is connected to the upstream CATV system. Therefore, it is necessary to perform switching control by distinguishing whether the power is supplied from the power supply apparatus 100. Unless such a distinction is made, a wasteful state occurs in which another CATV system power supply device 100 is charged with the power of the upstream CATV system power supply device 100, and the CATV system power supply device 100 operates normally. Will not.

  As one of the switching control methods, there is a method of changing to a frequency (for example, 55 Hz) different from the frequency of the commercial power source in the inverter 12. According to this method, it is possible to distinguish between power from a commercial power supply of 50 Hz or 60 Hz and power from the CATV system power supply apparatus 100 of 55 Hz. The frequency can be measured by, for example, a frequency counter, an FFT analyzer, a frequency bridge, etc., and the switching control of the switch 13 may be performed based on the measured value.

  The frequency counter measures the frequency by shaping AC power into a rectangular wave or a pulse wave and counting the number of waves per unit time. In addition, the frequency of the rectangular wave or pulse wave may be measured by measuring the rising or falling cycle. The FFT analyzer is a method of obtaining a frequency by sampling a voltage value at a predetermined sampling frequency, obtaining a frequency spectrum by performing Fourier transform, and analyzing the spectrum. A method may be used in which a voltage value is sampled at a predetermined sampling frequency, a time waveform of the voltage is estimated from the sampled value, and the frequency is obtained by analyzing the time waveform of the voltage. The frequency bridge is a method for obtaining a frequency from the equilibrium condition of a bridge circuit such as a Wien bridge. In the case of the frequency bridge, for example, the frequency satisfying the equilibrium condition is 55 Hz, and the voltage difference when deviating from the equilibrium condition is amplified and detected by the amplifier. The power of 50 Hz to 60 Hz, which is the output of the commercial power supply, can be discriminated, whereby the switch 13 can be controlled. Of these frequency measurement methods, it is desirable to use a frequency counter from the viewpoint of measurement time, ease of measurement, and measurement accuracy.

  Specifically, the frequency of the electric power supplied to the CATV system power supply device 100 is measured, and when AC power of 50 Hz to 60 Hz is supplied, the point c and the charger 10 are connected. When the AC power of 55 Hz is supplied or when the power is not supplied, the control may be performed so that the point c and the inverter 12 are connected. If the switch 13 is controlled in this manner, the power of the upstream CATV system power supply device 100 is not charged with another CATV system power supply device 100, and the CATV system power supply device 100 is normally operated. be able to.

  In addition to the method of distinguishing between the power from the commercial power supply and the power from the CATV system power supply device 100 by changing the frequency as described above, the distinction is made by a method of changing the voltage value, changing the waveform, changing the phase, etc. Then, the switching control of the switch 13 may be performed. Of course, the power from the commercial power supply and the power from the CATV system power supply apparatus 100 may be distinguished by changing at least two of the frequency, voltage, waveform, and phase.

  FIG. 2 is a diagram illustrating an example of a CATV system in which the CATV system power supply device 100 according to the first embodiment is incorporated. The CATV system is a system that includes a center device 101 and operates a broadcast service, an Internet connection service, a telephone service, and the like between the center device 101 and the subscriber's house 110 via the coaxial cable 102. A coaxial cable 102 connected to the center apparatus 101 is branched by a bidirectional trunk branch amplifier 103. The branched coaxial cable 102 is further branched by the branching unit 104 and connected to the subscriber's house 110. In addition, bidirectional amplifiers 105 are inserted into the coaxial cable 102 branched by the bidirectional trunk branch amplifier 103. Further, a power inserter 107 is inserted into the coaxial cable 102, and 100V AC power from a commercial power source is stepped down to 60V by a transformer 106 and superimposed on the coaxial cable 102 for transmission. The AC power superimposed on the coaxial cable 102 is supplied to the bidirectional trunk branch amplifier 103 and the bidirectional amplifier 105. Further, the CATV system power supply device 100 is inserted in each of the coaxial cables 102 in the vicinity of the bidirectional trunk branch amplifier 103 and the bidirectional amplifier 105.

  Next, the operation of the CATV system power supply apparatus 100 will be described.

  When AC 100 V commercial power is supplied, AC 60 V AC power stepped down by the transformer 106 is superimposed on the coaxial cable 102, and AC 60 V AC power is supplied to the bidirectional trunk branch amplifier 103 and the bidirectional amplifier 105. . Thus, the bidirectional trunk branch amplifier 103 and the bidirectional amplifier 105 are driven. At this time, in the CATV system power supply device 100 installed in the vicinity of the bidirectional trunk branch amplifier 103 and the bidirectional amplifier 105, the switch 13 of the CATV system power supply device 100 connects the coaxial cable side and the charger 10 side. A part of the AC power superimposed on the coaxial cable 102 is input to the charger 10 via the switch 13. The charger 10 converts the AC power into DC power and controls the storage battery 11 to be charged.

  When the commercial power supply fails and AC power is no longer transmitted to the coaxial cable 102, the switch 13 of the CATV system power supply device 100 is switched to connect the coaxial cable side and the output side of the inverter 32. The DC power output from the storage battery 11 is converted into AC 60 V AC power by the inverter 32 and superimposed on the coaxial cable 102. The AC power is supplied to the bidirectional trunk branch amplifier 103 and the bidirectional amplifier 105 installed in the vicinity of each CATV system power supply device 100. Here, since the bidirectional trunk branch amplifier 103 and the bidirectional amplifier 105 are installed in the vicinity of the power supply apparatus 100 for CATV system, there is little transmission loss and power can be supplied efficiently. Therefore, even when the commercial power supply is interrupted, the bidirectional trunk branch amplifier 103 and the bidirectional amplifier 105 are driven, and the service by the CATV system is maintained.

  Further, when the commercial power supply recovers from the power failure and AC power is again superimposed on the coaxial cable 102 and transmitted, the switch 13 of the CATV system power supply apparatus 100 connects the coaxial cable side and the charger 10. The operation is performed so that the storage battery 11 is charged by the charger 10 again.

  As described above, since the CATV system power supply apparatus 100 according to the first embodiment is installed adjacent to each bidirectional main branch amplifier 103 and bidirectional amplifier 105, transmission loss due to the coaxial cable 102 is small, and a power failure occurs. Sometimes power can be efficiently supplied to the bidirectional trunk branch amplifier 103 and the bidirectional amplifier 105. Also, even if the CATV system power supply device 100 cannot be supplied with power due to a malfunction, it is the one-way trunk branch amplifier 103 or the two-way amplifier 105 that stops driving due to this influence, and the service of the CATV system Can be minimized and the risk can be dispersed. Further, the CATV system power supply device 100 according to the first embodiment supplies power to one bidirectional trunk branch amplifier 103 or bidirectional amplifier 105, so that the capacity of the storage battery 11 is small and a small one is used. Since it can be used, the CATV system power supply device 100 itself can also be reduced in size. The CATV system power supply apparatus 100 is separated from the transformer 106 and can be installed separately from the transformer 106. For this reason, the degree of freedom of the places where the CATV system power supply apparatus 100 can be installed is increased, and the installation cost can be reduced. Further, as a result of using the CATV system power supply apparatus 100 of the first embodiment for the CATV system, a CATV system that is highly reliable and can be operated at low cost can be constructed.

  In the CATV system, the transformer 106 may be replaced with a conventional UPS (for example, the one shown in FIG. 5). Since the conventional UPS is large, the installation cost is high, but there is an advantage that power can be supplied for a long time by power supply by the conventional UPS and the power supply apparatus 100 for the CATV system of the first embodiment at the time of power failure.

  FIG. 3 shows a power supply apparatus 200 for a CATV system according to the second embodiment. The CATV system power supply apparatus 200 according to the second embodiment is different from the CATV system power supply apparatus 100 according to the first embodiment in the configuration of the portion connected to one point c as follows. The part includes a charger 20, a storage battery 21, a switch 23, and a rectifier 28. As the charger 20 and the storage battery 21, the same ones as those shown in the CATV system power supply apparatus 100 of the first embodiment can be used.

  At one point c, a rectifier 28 and a charger 20 are connected. The charger 20 converts part of the AC power from the coaxial cable into DC power, and supplies the DC power to the storage battery 21 for charging. To work.

  The rectifier 28 is a single-phase half-wave rectifier circuit, a single-phase bridge rectifier circuit, or the like, and converts a part of the AC power from the coaxial cable to DC power and outputs it.

  The switch 23 switches the connection between the rectifier 28 and the terminal 29 and the connection between the storage battery 21 and the terminal 29. In this switching control, when commercial power is supplied from a commercial power source and AC power is transmitted through the coaxial cable, the rectifier 28 and the terminal 29 are connected to each other. When AC power is not transmitted, control is performed so that the storage battery 21 and the terminal 29 are connected. Such control is possible, for example, depending on whether or not AC power is transmitted between the coaxial cable terminal 14A and the coaxial cable terminal 14B, similarly to the switch 13 of the CATV system power supply apparatus 100 of the first embodiment. is there.

  The terminal 29 is connected to a load such as a bidirectional trunk branch amplifier or a trunk branch amplifier. Since direct current power is supplied from the terminal 29 to those loads, those without a power supply device that converts alternating current power into direct current power are used for the loads. Since no power supply device is required for the load, the cost of the load can be reduced.

  Next, the operation of the CATV system power supply apparatus 200 will be described.

  When AC 100 V commercial power is supplied, AC power is supplied from the coaxial cable 102 to the CATV system power supply device 200 and input to the rectifier 28. Then, it is converted into DC power by the rectifier 28 and output. The switch 23 connects between the rectifier 28 and the terminal 29, and the DC power from the rectifier 28 is DC-transmitted from the terminal 29 and supplied to the load. In this way, even when commercial power is supplied, DC power is supplied to the load via the CATV system power supply device 200 and driven. Further, AC power from the coaxial cable 102 is also input to the charger 20, and the charger 20 controls the storage battery 21 to be charged.

  When the commercial power supply fails and AC power is not transmitted to the coaxial cable 102, the switch 13 of the CATV system power supply device 100 is switched to connect the storage battery 21 and the terminal 29. Then, DC power from the storage battery 21 is DC transmitted from the terminal 29 and supplied to the load to be driven. As a result, even when the commercial power supply is interrupted, the service by the CATV system is maintained.

  As described above, according to the CATV system power supply apparatus 200 of the second embodiment, in addition to the same advantages as the CATV system power supply apparatus 100 of the first embodiment, direct current power is directly transmitted to the load. Power can be supplied to the load. In addition, since it is not necessary to provide a power supply device that converts AC power to DC power in the load, it is possible to reduce the cost of the load and, in turn, to reduce the cost for constructing the CATV system.

  FIG. 4 shows a power supply apparatus 300 for a CATV system according to the third embodiment. The CATV system power supply apparatus 300 according to the third embodiment is the same for the coaxial cable terminals 14A and 14B and the capacitor 15 of the CATV system power supply apparatus 100 according to the first embodiment. Other portions include a solar cell 33, a charger 30, a storage battery 31, an inverter 32, and an inductor 36. About the storage battery 31 and the inverter 32, the thing similar to what was shown in the power supply apparatus 100 for CATV systems of Example 1 can be used.

  The solar cell 33 converts light such as sunlight into DC power and outputs it. The charger 30 is connected to the solar battery and operates to supply the DC power from the solar battery 33 to the storage battery 31 for charging. The inverter 32 is connected to the storage battery 31, and the output side thereof is connected to a point d between the capacitor 15 and the coaxial cable terminal 14B via an inductor 36. The inverter 32 converts the DC power from the storage battery 31 into AC power and outputs it to the coaxial cable.

  Next, the operation of the CATV system power supply apparatus 300 will be described.

  When commercial power of AC 100 V is supplied, direct-current power is output by power generation by the solar battery 33 and output to the charger 30. Then, the charger 30 controls the storage battery 31 to be charged. On the other hand, the AC power superimposed and transmitted on the coaxial cable is supplied to the load to drive the load.

  When the commercial power supply fails and AC power is no longer transmitted to the coaxial cable 102, the DC power output from the storage battery 11 is converted into AC 60V AC power by the inverter 32 and superimposed on the coaxial cable. The AC power is supplied to and driven by a load installed in the vicinity of each CATV system power supply device 300. As a result, even when the commercial power supply is interrupted, the service by the CATV system is maintained.

  As described above, according to the CATV system power supply apparatus 300 of the third embodiment, in addition to the same advantages as the CATV system power supply apparatus 100 of the first embodiment, the storage battery is charged by the solar cell. Can reduce consumption.

  In the embodiment, the CATV system power supply apparatus of the present invention is applied to a CATV system configured using only a coaxial cable. However, the CATV system power supply apparatus of the present invention includes an optical fiber cable and a coaxial cable. The present invention can also be applied to the HFC method and the FTTC method using both.

  In the embodiment, the bidirectional trunk branch amplifier 103 and the bidirectional amplifier 105 are shown as an example of loads in the CATV system. However, the trunk includes a bidirectional trunk distribution amplifier, a bidirectional distribution amplifier, and the like. be able to. In the HFC method and the FTTC method, an optical node is also included in the load of the present invention.

  In addition, although the CATV system power supply apparatus according to the embodiment supplies power to one load, it is not necessarily required to be one, and it is sufficient if the number of supplies is smaller than that of a conventional UPS. Specifically, there are 1 to 3 loads, and the most desirable is to supply power to one load.

  The power supply apparatus for CATV system of the present invention can be used for a CATV system.

DESCRIPTION OF SYMBOLS 10, 20, 30: Charger 11, 21, 31: Storage battery 12, 32: Inverter 13, 23: Switch 14A, B: Coaxial cable terminal 15: Capacitor 16, 17, 36: Inductor 28: Rectifier 33: Solar cell 100 : CATV system power supply device 101: Center device 102: Coaxial cable 103: Bidirectional trunk branch amplifier 104: Branch device 105: Bidirectional amplifier 106: Transformer 107: Power inserter

Claims (5)

In a CATV system power supply apparatus that is used in a CATV system in which commercial power is stepped down and supplied to a load via an electric transmission line, and that supplies power to the load during a power failure of the commercial power,
When commercial power is supplied via the electrical transmission path, a charger into which a part of the commercial power is input,
A storage battery that is stored by control by the charger and outputs DC power;
An inverter that converts DC power from the storage battery into AC power and outputs the power;
When commercial power is supplied through the electrical transmission path, the electrical transmission path is connected to the input side of the charger, and when commercial power is out of power, the electrical transmission path and A switch for switching to connect the output side of the inverter;
A power supply device for CATV system, comprising: In a CATV system power supply apparatus that is used in a CATV system in which commercial power is stepped down and transmitted to an electric transmission line and supplies power to a load.
A rectifier that converts a portion of the commercial power into DC power when commercial power is supplied via the electrical transmission path;
When commercial power is supplied via the electrical transmission path, a charger into which a part of the commercial power is input,
A storage battery that is stored by control by the charger and outputs DC power;
When commercial power is supplied via the electrical transmission line, the output side of the rectifier and the load are connected to supply DC power to the load, and when commercial power is out of power A switch for connecting the output side of the storage battery and the load to supply DC power to the load;
A power supply device for CATV system, comprising: In a CATV system power supply apparatus that is used in a CATV system in which commercial power is stepped down and supplied to a load via an electric transmission line, and that supplies power to the load during a power failure of the commercial power,
A solar cell that generates light and outputs DC power;
A charger to which DC power from the solar cell is input;
A storage battery that is stored by control by the charger and outputs DC power;
An inverter that converts direct current power from the storage battery into alternating current power and outputs it to the electrical transmission path;
A power supply device for CATV system, comprising:   The power storage device for a CATV system according to any one of claims 1 to 3, wherein the storage battery is a lithium ion secondary battery or a nickel metal hydride battery.   5. A CATV system, wherein the CATV system power supply device according to claim 1 is installed for each of the loads.

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