JP2008109788A - Power converting and superposing system and in-building transmission system using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power converting and superposing system, which can facilitate its management without necessity of preparing each kind of AVR different in input voltage and also can reduce its cost, and an in-building transmission system using it. <P>SOLUTION: This voltage converting and superposing system includes a transformer which steps down commercial voltage, a power connector which can connect the high-voltage side of the transformer to a commercial power source, a superposing circuit which superposes the converted power converted with the transformer on a high frequency signal transmission path, a superposion changeover switch which can switch the superposing circuit to the upstream side and or the downstream side of the high-frequency signal transmission path, and a power supplier which can take out the power on the high voltage side of the transformer and supplies it to the AVR in the high-frequency signal transmission path. Thereby, electric equipment operates, getting as high voltage as the commercial power has even in an environment without a commercial power. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides a TV signal transmission line for supplying power to various electric devices such as amplifiers and frequency converters in a high-frequency signal transmission line (TV signal transmission line) constructed in an apartment house such as an apartment. The present invention relates to a power superimposing system for superimposing and supplying to a building, and an in-building transmission system incorporated in a high-frequency signal transmission path in the building using the same.

  As shown in FIG. 2, a television signal transmission line (high-frequency signal transmission line: usually a coaxial cable) is installed in an apartment house (building) such as a building or condominium where a cable TV system such as CATV or CCTV is introduced. K is laid, and an amplifier for compensating for the transmission loss of the television signal is connected thereto. Depending on the system, a frequency converter or other electrical equipment A may be connected to the high-frequency signal transmission line K.

  As the power source of the amplifier A, a DC low voltage such as DC15V or DC24V is generally used. In an environment where a commercial power supply AC100V is secured near the electrical equipment A, the AC100V is stepped down by a transformer T, and the AC voltage in the electrical equipment A is converted into direct current by a power supply circuit (common name: AVR). DC low voltage such as DC15V and DC24V is obtained. In an environment where a commercial power source is not secured near the electrical device, the commercial power source of AC 100V is converted into a low voltage of AC 30V by the transformer T and is superimposed on the high-frequency signal transmission path K and transmitted. It is converted to DC15V, DC24V, etc. by AVR and supplied to the amplifier a of the electric device A. This system is generally called a power supply superposition system.

  The power supply superposition system shown in FIG. 2 includes a superposition circuit composed of a transformer T that steps down a commercial power supply of AC100V to AC30V, a choke coil L for high frequency prevention, and a capacitor C for low frequency prevention. The converted voltage of AC30V is superposed on the high frequency signal transmission line K and transmitted, and the superposed voltage is converted into a DC voltage such as DC15V or DC24V by the AVR of the amplifier A and supplied to the amplifier a of the high frequency signal transmission line K. It is. Moreover, when the inside of the electric equipment A operates with a single DC power source (for example, DC 15 V), there is a method of superimposing the DC voltage on the high-frequency signal transmission path (not shown).

  Electrical devices such as amplifiers and frequency converters are made on the premise that commercial power is used, but there are various types of electrical devices with different gains, output levels, adjustment functions, and so on. There are various standards. For example, since the AVR circuit configuration is different between AC30V and AC100V, even if the same DC voltage (for example, DC15V) is output, equipment manufacturers can use AC30V input and AC100V so that they can support the power supply at the site of installation. Two types of input must be prepared. As an example, what is shown in FIG. 3 (a) is the input voltage AC100V, output voltage DC15V, what is shown in FIG. 3 (b) is the input voltage AC30V, output voltage DC15V, and what is shown in FIG. 3 (c) is the input voltage AC100 / 30V. The output voltage is DC15V. The AVR dedicated to AC100V input shown in FIG. 3A is inexpensive because it is often used, but there is a problem that it cannot be used in a place where there is no AC100V commercial power supply. The AVR dedicated to AC30V input in FIG. 3 (b) is expensive because there is little demand, and there is a problem that it cannot be used in a place without an AC30V power source. The AC100V / AC30V shared input AVR in FIG. 3 (c) requires only one type, so there is no problem like the input-only AVR, but there is a problem that it is expensive because it is special.

  It is desirable for the power supply superimposition system manufacturer to provide a power superimposition system that supports the various AVRs described above, but this involves difficulties in terms of design, inventory management, cost, etc., and the manufacturer predicts market trends. At present, the lineup of power supply superposition systems is narrowed to a small number by investigating customer intentions.

  When the lineup of power supply superimposition systems is narrowed down, there are no electrical devices with the desired characteristics (gain, output level, adjustment function, etc.). There is a situation where there is a shortage or there are few adjustment functions, and the original performance of electrical equipment does not match the installation site, making it difficult to find electrical equipment that is easy to use for the site. In addition, since the inside of electrical equipment normally operates with direct current such as DC15V and DC24V, for example, in the case of electrical equipment that operates with a single DC15V power supply, if DC15V is superimposed on a high-frequency signal transmission line, the DC15V It is relatively easy to take out the choke coil or the like in the electric device and supply it to the device of the electric device as it is to operate the amplifying unit. However, recently, due to diversification of devices, the operation voltage of the device itself is various, and a plurality of power sources such as DC15V and DC24V are often used together. For this reason, it has become difficult to provide a power supply superposition system capable of supplying an appropriate power source corresponding to electrical equipment, and the product lineup of manufacturers cannot meet the market demand. In addition, lineup of various electric devices for commercial power supply or power supply superposition system such as AC30V is troublesome in design / inventory management because of the large number of types, resulting in high cost.

  Since the AVR circuit configuration is different for AC30V and AC100V input, even if the same DC voltage (for example, 15V) is output, equipment manufacturers can use AC30V input and AC100V input to support the power supply at the site of installation. Two types of must be prepared. This complicates design and inventory management and contributes to high costs. AVR dedicated to AC 100V input is inexpensive because it is widely used, but there is a problem that it cannot be used in a place where there is no AC 100V commercial power supply. AVR dedicated to AC30V input is expensive because of low demand, and there is a problem that it cannot be used in a place where there is no AC30V power supply. Since there is only one type of AC100V / AC30V shared input AVR, there is no problem like the input-only AVR, but there is a problem that it is expensive because it is special.

  The power conversion superimposing system of the present invention solves the above-described problems, and can supply a predetermined input power to the electric equipment on the television signal transmission path even in a place where commercial power cannot be secured. Therefore, as described in claim 1, in the voltage conversion superposition system in which the AC commercial power supply voltage is stepped down by the transformer and superimposed on the high-frequency signal transmission line, the voltage conversion superposition system includes the transformer and the high voltage side of the transformer to the commercial power supply. A connectable power connector, a superimposing circuit that superimposes the converted power converted by the transformer on the high-frequency signal transmission path, a superposition changeover switch that can be switched and connected to the upstream side or the downstream side of the high-frequency signal transmission path, A power supply that can take out the power supply on the high-voltage side of the transformer and supply it to the AVR for electrical equipment in the high-frequency signal transmission path is provided.

  As described in claim 2, the in-building transmission line of the present invention connects the voltage conversion superposition system to two or more locations on the upstream side and the downstream side of the high-frequency signal transmission line in the building, and both voltage conversion superposition systems. In both cases, the low-voltage side of the transformer is connected to the high-frequency signal transmission line side, and one voltage conversion superposition system connects the high-voltage side of the transformer to the commercial power supply and takes in the commercial power supply voltage to the transformer. The output conversion voltage is superimposed on the high-frequency signal transmission line by the superposition circuit, and the other voltage conversion superposition system takes in the superimposed power supply voltage superimposed on the high-frequency signal transmission line to the low voltage side of the transformer and boosts it to the high voltage side. The boosted voltage is output from the power supply tool as an input power source for the AVR for the electrical equipment in the high-frequency signal transmission line, and the DC voltage converted by the AVR is sent to the electrical equipment. And it can be supplied to the width and the like.

The power conversion superposition system of the present invention has the following effects.
Connect the power conversion superposition system of the same configuration to two or more places of the high frequency signal transmission line, connect the low voltage side of the power transformer of both voltage conversion superposition systems to the high frequency signal transmission line, and the voltage of the one with commercial power supply (one) If the high voltage side of the power transformer of the conversion superposition system is connected to the commercial power supply, the commercial power supply voltage (AC100V) is taken into the transformer and stepped down (AC30V), and the voltage is superimposed on the high-frequency signal transmission line by the superposition circuit. In the voltage conversion superposition system without the other (the other), the superimposed power supply voltage (AC30V) superimposed on the high-frequency signal transmission path can be boosted (AC100V) with a transformer and supplied to the AVR. For this reason, since various electrical devices need only be designed assuming a normal commercial power supply, product management is facilitated, and costs can be greatly reduced. Therefore, it is not necessary to prepare various AVRs having different input voltages, management becomes easy, and cost is reduced.

The in-building transmission system of the present invention connects the power conversion superposition system (same) of the present invention to two or more locations of the high-frequency signal transmission line, and both the low-voltage sides of the transformers of the two voltage conversion superposition systems are high-frequency signals. Since it is connected to the transmission line side, the following effects are obtained.
1. The high voltage side of the transformer of one voltage conversion superposition system is connected to a commercial power supply, the commercial power supply voltage (for example, AC100V) is taken into the transformer, and the conversion voltage (for example, AC30V) converted by the transformer is used as a high-frequency signal transmission line by the superposition circuit The other voltage conversion superposition system boosts the superimposed power supply voltage (for example, AC30V) transmitted through the high-frequency signal transmission line with a transformer (for example, to AC100V), and takes the boosted power supply voltage as the input power of AVR. The DC voltage converted by the AVR can be supplied to the electric device. Therefore, if there is a commercial power supply on one voltage conversion superposition system side, AC100V can be secured even if there is no commercial power supply on the other voltage conversion superposition system side, and this is supplied to the AVR with the input voltage AC100V. Can do.
2. Since one type of voltage conversion superposition system with the same configuration can be shared in two or more places in the high-frequency signal transmission line, as an electrical device used in the building transmission system, the input voltage conforms to the high voltage output voltage of the voltage conversion superposition system. By preparing different types of AVR, the voltage conversion superposition system and AVR can be unified to one standard, so it is not necessary to prepare various standards of AVR and voltage conversion superposition systems, and the manufacturing cost is reduced. Management becomes easy. Moreover, since it is sufficient to design an electric device assuming only a normal commercial power supply, the design is facilitated.

(Embodiment 1)
An example of an embodiment of the voltage conversion superimposing system of the present invention and an in-building transmission line using the same will be described below with reference to FIG. FIG. 1 shows an embodiment in which the voltage conversion superposition system 2 of the present invention is connected to two locations (an environment without a commercial power source and an environment) upstream and downstream of a high-frequency signal transmission line 1 laid in the building. . A coaxial cable is used for the high-frequency signal transmission line 1 similarly to the existing one, but a cable other than the coaxial cable can also be used if possible.

  Each voltage conversion superposition system 2 includes a transformer 3, a superposition electric circuit 4 that superimposes the conversion voltage on the high-frequency signal transmission line 1, a plug (commercial power supply connector) 5 that plugs into a commercial power outlet and takes in commercial power. An interlocking power switch SW1 provided between the commercial power input side of the transformer 3 and the plug 5 and capable of switching supply / stop of input power to the transformer 3, and a commercial power input side of the transformer 3 and the interlock switch SW1. A high-voltage power supply outlet (power supply tool) 6 connected between them is provided.

  The superposition electric circuit 4 has two transmission lines 7 and 8, and the high-frequency blocking choke coils L 1 and L 2 are connected to the transmission lines 7 and 8, respectively, and between the output sides of both choke coils L 1 and L 2. A high-frequency signal passing capacitor C is connected. Superimposition changeover switches SW2 and SW3 capable of switching the superposition / superposition stop of the step-down power supply to the high-frequency transmission path 1 are connected to the transmission paths 7 and 8, respectively. Connection terminals OUT1 and OUT2 are provided.

  The two voltage conversion superposition systems 2 in FIG. 1 have the same configuration, and the high voltage side and the low voltage side of the transformer 3 of both voltage conversion superposition systems are connected in opposite directions (the voltage conversion superposition system 2 on the right side in FIG. Transformer 3 has a high voltage side connected to the input side and a low voltage side connected to the output side, and transformer 3 of voltage conversion superposition system 2 on the left side has one high voltage side connected to the output side and the low voltage side connected to the input side (see FIG. 1). The voltage conversion superposition system 2 on the right side is for step-down conversion of commercial power (eg, AC100V) to AC30V, and the voltage conversion superposition system 2 on the other side (left side in FIG. 1) is for step-up conversion of superposition voltage (eg, AC30V) to AC100V. It can be used as

(Description of operation of the transmission system in the building in FIG. 1)
The operation of the in-building transmission system of FIG. 1 is as follows. This operation explanation is for the case where the commercial power source is AC100V, the superimposed power source is AC30V, and the high-frequency signal transmitted through the high-frequency signal transmission line 1 is a TV signal. The high-frequency signal may be other than the TV signal. In FIG. 1, the superposition changeover switch SW3 of both the left and right voltage conversion superposition systems 2 is closed, the switch SW2 is opened, the power switch SW1 of the left voltage conversion superposition system 2 is opened, and the power switch of the right voltage conversion superposition system 2 This is the case when SW1 is closed.

  When the AC plug (power connector) 5 of the voltage conversion superposition system 2 on the downstream side (right side) in FIG. 1 is inserted into a nearby commercial power outlet and the power switch SW1 in FIG. 1 is closed, the commercial power is captured. The taken AC100V commercial power is converted (stepped down) to AC30V by the transformer 3 and output to the secondary side, and is superimposed on the high-frequency signal transmission line 1 through the closed superposition changeover switch SW3 (switch SW2 is open) and upstream. Is transmitted to the side. Superposition is performed in the same way as existing superposition.

  The superimposed voltage of AC30V is input to the transformer 3 through the choke coil L2 of the upstream voltage conversion superposition system 2, and is converted (boosted) to AC100V by the transformer 3, and from the secondary side to the outlet (power supply tool) 6 Supplied. If the AVR plug 9 is inserted into the power supply 6, AC100V is taken into the AVR and converted into a predetermined DC voltage (for example, DC15V, DC24V) and supplied to the amplifying unit 11 of the electric device 10 in the high-frequency signal transmission path 1. The In this case, the high-frequency signal (TV signal) transmitted through the high-frequency signal transmission path 1 is amplified by the electrical device 10 on the upstream side (left side in FIG. 1), passes through the capacitor C, and is downstream of the high-frequency signal transmission path 1. Is transmitted, passed through the capacitor C of the voltage conversion superposition system 2 on the downstream side (right side in FIG. 1), transmitted downstream, amplified by the amplification unit 11 of the electrical device 10 connected to the output end, and further downstream Is transmitted. At this time, since the power switch SW1 of the voltage conversion superposition system 2 on the upstream side (left side in FIG. 1) is open, the secondary output (AC100V) of the transformer 3 flows to the AC plug (commercial power supply connector) 5. Absent.

  When both superposition changeover switches SW3 of the two voltage conversion superposition systems in FIG. 1 are opened and the other superposition changeover switch SW2 is both closed, the voltage of AC30V stepped down by the transformer 3 of the right side voltage conversion superposition system 2 in FIG. The signal is superimposed on the downstream side of the high-frequency signal transmission path 1 through the superposition changeover switch SW2 and transmitted downstream.

  If there is a commercial power supply in the environment where the voltage conversion superposition system 2 on the left side of FIG. 1 is installed, the power supply connector (plug) 5 of the voltage conversion superposition system 2 is inserted into a commercial power outlet and the commercial power supply is used. can do. In this case, the interlock switch SW1 of the left voltage conversion superposition system 2 is closed, the superposition changeover switch SW3 of both voltage conversion superposition systems 2 is closed, and SW2 is opened, and the power supply connector of the right voltage conversion superposition system 2 in FIG. (Plug) 5 is removed from the commercial power outlet, and the interlock switch SW1 of the voltage conversion superposition system 2 is opened. In this way, the commercial power source taken in by the power supply connector 5 of the voltage conversion superposition system 2 on the left side of FIG. 1 is stepped down to AC30V by the transformer 3, and superimposed on the high-frequency transmission line 1 through the superposition changeover switch SW3 and downstream. The voltage is transmitted, enters the transformer 3 through the superposition changeover switch SW3 of the voltage conversion superposition system 2 on the right side, is boosted to AC 100 V by the transformer 3, and is supplied to the power supply device 6. The TV signal is also transmitted downstream through the capacitor C of the voltage conversion superposition system 2 on the left side of FIG. 1 and the capacitor C of the voltage conversion superposition system 2 on the right side of FIG.

  Although the electric device 10 in FIG. 1 is an amplifier, the electric device 10 may be a frequency converter or another device.

Explanatory drawing which shows an example of the ridge transmission system of this invention. Explanatory drawing which shows an example of the conventional ridge transmission system. (A)-(c) is explanatory drawing of AVR from which a standard differs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High frequency transmission line 2 Voltage conversion superimposition system 3 Transformer 4 Superposition electric circuit 5 Commercial power supply connection tool 6 Power supply tool 7, 8 Transmission line 9 Plug 10 Electric equipment 11 Amplification part L1, L2 Choke coil C Capacitor SW1 Power switch SW2, SW3 Superposition changeover switch OUT1, OUT2 External connection terminal

Claims (2)

  In a voltage conversion superposition system that steps down AC commercial power supply voltage with a transformer and superimposes it on a high-frequency signal transmission line, the voltage conversion superposition system includes a transformer, a power supply connector that can connect the high-voltage side of the transformer to a commercial power supply, and a transformer. A superposition circuit that superimposes the converted conversion power supply on the high-frequency signal transmission line, a superposition changeover switch that can be connected to the superposition circuit on the upstream side or the downstream side of the high-frequency signal transmission line, and the high-voltage side power supply of the transformer A voltage conversion superposition system comprising a power supply device capable of supplying an AVR for electrical equipment in a signal transmission path.   The voltage conversion superimposition system according to claim 1 is connected to two or more locations on the upstream side and the downstream side of the high-frequency signal transmission line in the building, and both voltage conversion superposition systems both have the low-voltage side of the transformer on the high-frequency signal transmission line side. One voltage conversion superposition system connects the high-voltage side of the transformer to the commercial power supply, takes the commercial power supply voltage into the transformer, and transmits the converted voltage that is stepped down by the transformer and output from the low-voltage side through the superposition circuit. The other voltage conversion superposition system takes in the superimposed power supply voltage superimposed on the high-frequency signal transmission line to the low voltage side of the transformer, boosts it, and outputs it to the high voltage side. An AVR input power source for an electric device in a signal transmission path is supplied so that a DC voltage converted by the AVR can be supplied to the electric device. The internal transmission system.

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