JP2013026895A - Antenna control system and antenna modem - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna control system capable of using power supply of a predetermined voltage regardless of a power supply voltage transmitted with coaxial interface system, and an antenna modem.SOLUTION: The antenna control system comprises an AISG device 17 that controls an antenna 10, a control apparatus 16 that transmits to the AISG device 17 a control signal and a power supply signal, a BS modem 13 that is superimposes a modulation signal generated by modulating the control signal input from the control apparatus 16 and a power supply signal on a feed signal to be output, and an antenna modem 2 that separates the modulation signal and the power supply signal from the feed signal input from the BS modem 13 and outputs the control signal demodulated from the modulation signal and the power supply signal to the AISG device 17. The antenna modem 2 includes a first DC/DC converter 3 that supports inputs of both positive and negative power supplies, and is configured to generate a power supply signal of a predetermined voltage compliant with AISG specification by the first DC/DC converter 3 and output the generated signal to the AISG device 17.

Description

  The present invention relates to an antenna control system and an antenna modem for controlling an antenna in accordance with an AISG (Antenna Interface Standards Group) standard.

  In mobile radio base stations, antenna tilt control can generally be performed by remote control. Initially, each manufacturer used a unique method as an antenna control method. However, in recent LTE (Long Term Evolution) radio base stations and the like, antenna control is often performed according to the AISG standard. The AISG standard is a standard standardized to ensure basic interoperability of antennas (see, for example, Patent Document 1).

  Usually, an AISG device (AISG terminal equipment) such as an antenna of a radio base station and a RET (Remote Electrical Tilt) unit that controls the antenna is arranged at a high position such as an upper part of a steel tower or a rooftop of a building. On the other hand, a radio that feeds power to an antenna and a control device (AISG control device) that controls an AISG device are generally arranged at a low position such as a lower part of a steel tower. Here, the control device transmits a control signal (RS485 standard signal) to the AISG device, controls the AISG device to control the antenna, and supplies power to the AISG device.

  The antenna and the radio are connected by a feed line (RF feed line) made of a coaxial cable, and the AISG device and the control device are connected by a control cable (AISG control cable) conforming to the AISG standard. For example, the antenna and the AISG are connected. When the device is arranged at the upper part of the steel tower and the radio device and the control device are arranged at the lower part of the steel tower, two cables of the feeder line and the control cable are laid from the upper part to the lower part of the steel tower.

  However, for example, in a steel tower as high as several tens of meters, it is very troublesome to lay cables from the upper part to the lower part of the steel tower, and the cost for the construction also increases. In order to solve this problem, the AISG standard defines a method called a coaxial interface or a modem option (hereinafter referred to as a coaxial interface method).

  As shown in FIG. 8, in the antenna control system 81 using the coaxial interface system, two modems called a BS modem 13 and an antenna modem 14 are provided in the middle of the feed line 12 that connects the antenna 10 and the radio 11. The BS modem 13 and the antenna modem 14 are used to transmit a control signal and a power signal for the AISG device 17 via the feeder line 12.

  The BS modem 13 is provided in the vicinity of the wireless device 11 (for example, the lower part of the steel tower), and a control device (AISG control device) 16 is connected via a control cable 15. The antenna modem 14 is provided in the vicinity of the antenna 10 (for example, at the top of the steel tower), and an AISG device 17 is connected via the control cable 15.

  As shown in FIG. 9, the BS modem 13 modulates a control signal (RS485A, RS485B) input from the control device 16 via the input AISG connector 21 by the modem (modem circuit) 22 to generate a modulated signal. Then, the modulation signal and the power signal input from the control device 16 are combined by the combining circuit 23, and the combined signal (referred to as AISG signal) is output to the bias T circuit (Bias Tee) 24. The bias T circuit 24 is configured by combining a DC blocking capacitor (capacitance element) and an AC blocking inductor (inductive element). The bias T circuit 24 receives the AISG signal input from the synthesis circuit 23 from the wireless device 11 as an input side RF. The signal is superimposed on the power supply signal (RF signal) input via the connector 25 and output from the output side RF connector 26 to the power supply line 12 on the antenna 10 side.

  As shown in FIG. 10, in the conventional antenna modem 14, a feed signal (a feed signal on which an AISG signal is superimposed) input from the BS modem 13 via the input side RF connector 31 is input to the bias T circuit 32. In the T circuit 32, the AISG signal is separated from the power feeding signal. The separated feed signal is output from the output-side RF connector 33 to the feed line 12 on the antenna 10 side. The AISG signal separated by the bias T circuit 32 is further separated into a modulation signal and a power supply signal by the separation circuit 34. The separated modulation signal is demodulated by the modem (modem circuit) 35 and returned to the control signal. The demodulated control signal and the power signal separated by the separation circuit 34 are output to the AISG device 17 via the output AISG connector 36.

  In general, the modem 22 of the BS modem 13 and the modem 35 of the antenna modem 14 have the same configuration. As shown in FIG. 11, the modems 22 and 35 modulate a control signal (RS485 standard signal) input to the RS485 interface 91 by a modulation circuit 92 to generate a modulation signal, and directionally couple the generated modulation signals. The modulation signal input to the directional coupler 93 is demodulated by the demodulation circuit 94, returned to the control signal, and output from the RS485 interface 91 to the outside. Has been. The power supply circuit 95 of the modems 22 and 35 uses the power supplied from the control device 16 to convert the input power supply voltage to the voltage for the modems 22 and 35, and the RS485 interface 91, the modulation circuit 92, and the demodulation circuit. It is comprised so that it may output to 94.

  By adopting such a coaxial interface method, it is only necessary to lay the feeder line 12 from the upper part to the lower part of the tower, and the total cost of the antenna control system including the construction cost can be greatly suppressed. Become.

Special table 2010-519844 gazette

  By the way, as shown in Table 1, in the AISG standard, three types of power supplies of +12 V (No. 1), -48 V (No. 2), and 10 to 30 V (No. 6) are prepared. Table 1 shows the pin terminal number (Pin Number) of the connector specified in the AISG standard, the signal (Signal) propagated at each pin terminal, the mandatory connection (Mandatory), or the optional connection (Optional) This indicates a requirement (Requirement), and the NC No. 8 means no connection.

  However, in the above-described coaxial interface type antenna control system 81, the power signal is transmitted through the feeder 12 made of a coaxial cable, and the coaxial cable has only two conductors, a central conductor and an outer conductor. Only one type of power can be transmitted. For this reason, the AISG device 17 that uses a power source other than one type of power source for transmission cannot be used.

  In other words, in the coaxial interface type antenna control system 81 described above, the AISG device 17 is used only when the power source used matches the power source transmitted by the coaxial interface method (the power source supplied by the control device 16). Can not.

  Therefore, in the above-described coaxial interface type antenna control system 81, what type of AISG device 17 can be used when the power supply voltage transmitted by the coaxial interface method, that is, the power supply voltage supplied by the control device 16 is unknown. It was inconvenient because it could not be judged.

  The present invention has been made in view of the above circumstances, and provides an antenna control system and an antenna modem that can use a power supply of a predetermined voltage regardless of the power supply voltage transmitted by the coaxial interface method. Objective.

  The present invention was devised to achieve the above object, and includes an AISG device that controls an antenna in accordance with an AISG standard, a control signal transmitted to the AISG device, and the AISG device that controls the AISG device. Provided in the middle of a power supply line for controlling the antenna and transmitting a power signal to the AISG device and the antenna and a radio for supplying power to the antenna, and connected to the control device The control signal input from the control device is modulated to generate a modulation signal, and the modulation signal and the power supply signal input from the control device are superimposed on the power supply signal input from the wireless device. A BS modem that outputs to the feeder line on the antenna side, and is provided in the middle of the feeder line on the antenna side of the BS modem, and An ISG device is connected, and the modulation signal and the power signal are separated from the power supply signal input from the BS modem, and the modulation signal is demodulated and returned to the control signal. The control signal and the power signal are separated into the AISG device. And an antenna modem that outputs a later feeding signal to the feeding line on the antenna side. The antenna modem has a predetermined power supply regardless of whether a positive power source or a negative power source is input. A first DC / DC converter compatible with both positive and negative power inputs capable of generating a voltage power signal is provided, and the first DC / DC converter defines the AISG standard from the power signal input from the BS modem and separated from the power supply signal. Antenna control system configured to generate and output a power signal of a predetermined voltage to the AISG device A.

  The first DC / DC converter is a power supply having a polarity that the DC / DC converter corresponding to the single power supply input does not correspond to the front stage of the DC / DC converter corresponding to the single power input corresponding to only one of the positive power supply and the negative power supply. An input switching circuit that inverts and outputs the polarity of the input power supply signal when a signal is input may be provided.

  The antenna modem includes a second DC / DC converter that generates a power signal of another voltage specified by the AISG standard from the power signal generated by the first DC / DC converter, and the first DC / DC converter generates the antenna modem. The power signal generated by the second DC / DC converter and the power signal generated by the second DC / DC converter may be output to the AISG device.

  The antenna modem includes a plurality of the first DC / DC converters, and the plurality of first DC / DC converters use a voltage defined by the AISG standard from a power signal input from the BS modem and separated from a power feeding signal. The power supply signals having different voltages may be generated and output to the AISG device.

  The antenna modem bypasses the first DC / DC converter having the same generated voltage when the voltage of the power signal input from the BS modem and separated from the power supply signal is equal to the voltage generated by the first DC / DC converter. And an output switching circuit that directly outputs a power signal input from the BS modem and separated from the power supply signal to the AISG device.

  The present invention also provides an AISG device that controls the antenna in accordance with the AISG standard, a control signal transmitted to the AISG device, the AISG device that controls the antenna, and the AISG device. Provided in the middle of a power supply line connecting a control device that transmits a power signal and the antenna and a radio that feeds power to the antenna, the control device is connected, and a control signal input from the control device A BS that modulates to generate a modulation signal, superimposes the modulation signal and the power supply signal input from the control device on the power supply signal input from the radio, and outputs the signal to the power supply line on the antenna side A modem, and is provided in the middle of the feeder line on the antenna side of the BS modem. An AISG device is connected, and the modulation signal and the power signal are separated from the power supply signal input from the BS modem, and the modulation signal is demodulated and returned to the control signal. The control signal and the power signal are separated into the AISG device. An antenna modem that outputs a subsequent power supply signal to the power supply line on the antenna side, and can generate a power signal of a predetermined voltage regardless of whether a positive power supply or a negative power supply is input. A first DC / DC converter corresponding to the input is provided, and the first DC / DC converter generates a power signal having a predetermined voltage defined by the AISG standard from the power signal input from the BS modem and separated from the power feeding signal. And an antenna modem configured to output to the AISG device.

  ADVANTAGE OF THE INVENTION According to this invention, the antenna control system and antenna modem which can use the power supply of a predetermined voltage irrespective of the power supply voltage transmitted by a coaxial interface system can be provided.

(A) is a schematic block diagram of the antenna control system which concerns on one embodiment of this invention, (b) is a schematic block diagram of an antenna modem. It is a cross-sectional view which shows an example of the control cable used for the antenna control system of FIG. In the antenna modem of FIG.1 (b), it is a circuit block diagram in the case of using the DC / DC converter corresponding to a single power supply input for a 1st DC / DC converter. (A), (b) is a schematic block diagram which shows the modification of the antenna modem of FIG.1 (b). (A) is a schematic block diagram which shows the modification of the antenna modem of FIG.1 (b), (b) is a circuit structure in the case of using the DC / DC converter corresponding to a single power supply input for a 1st DC / DC converter. FIG. (A) is a schematic block diagram which shows the modification of the antenna modem of FIG.1 (b), (b) is a schematic block diagram of an output switching circuit. It is a schematic block diagram which shows the modification of the antenna modem of FIG.1 (b). It is a schematic block diagram of the conventional antenna control system. It is a schematic block diagram of BS modem used for the conventional antenna control system of FIG. It is a schematic block diagram of the conventional antenna modem used for the conventional antenna control system of FIG. It is a schematic block diagram of the modem (modem circuit) used for BS modem of FIG. 9, and the antenna modem of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1A is a schematic configuration diagram of an antenna control system according to the present embodiment, and FIG. 1B is a schematic configuration diagram of an antenna modem.

  As shown in FIG. 1 (a), the antenna control system 1 controls the AISG device 17 by transmitting a control signal to the AISG device 17 that controls the antenna 10 according to the AISG standard, and the AISG device 17. A BS modem 13 provided in the middle of a feeder 12 that controls the antenna 10 and transmits a power supply signal to the AISG device 17 and the antenna 10 and a radio 11 that feeds power to the antenna 10. And the antenna modem 2 of the present invention provided in the middle of the feeder line 12 on the antenna 10 side of the BS modem 13.

  Here, as an example, a case where the AISG device 17 uses a 10 to 30 V power source will be described. The power supply output by the control device 16 is unknown (any of 10 to 30 V power supply, +12 V power supply, and −48 V power supply).

  The BS modem 13 generates a modulation signal by modulating the control signal input from the control device 16 via the input AISG connector (male connector) 21, and generates the modulation signal and the power signal input from the control device 16. The synthesized signal (referred to as AISG signal) is superimposed on the power feeding signal input from the wireless device 11 via the input side RF connector 25 and output from the output side RF connector 26 to the power feeding line 12 on the antenna 10 side. It is. The BS modem 13 is a general BS modem conventionally used, and is the same as that described with reference to FIG. The input AISG connector 21 is a general connector (AISG connector) conforming to the AISG standard, and the RF connectors 25 and 26 are general coaxial cable connectors.

  The antenna modem 2 separates the AISG signal from the power feeding signal input from the BS modem 13 via the input-side RF connector 31, separates the AISG signal into a modulation signal and a power supply signal, and demodulates the modulation signal to control it. Returning to the signal, the control signal and the power signal are output from the output AISG connector 36 to the AISG device 17, and the separated power supply signal is output from the output side RF connector 33 to the power supply line 12 on the antenna 10 side. Details of the antenna modem 2 will be described later. The output AISG connector 36 is a general connector (AISG connector) conforming to the AISG standard, and the RF connectors 31 and 33 are general coaxial cable connectors.

  The BS modem 13 is provided in the vicinity of the wireless device 11 (for example, at the bottom of the steel tower), and a control device 16 is connected via a control cable 15. The antenna modem 2 is provided in the vicinity of the antenna 10 (for example, at the top of the steel tower), and an AISG device 17 is connected via the control cable 15.

  As shown in FIG. 2, the control cable 15 includes two control signal lines 44 that transmit control signals and three power supply lines 45 for supplying power. A drain wire 46 is vertically attached to the two control signal lines 44, and a shield tape (metal tape) is provided around the two control signal lines 44 and the drain wire 46 so as to surround them collectively. 47 is provided.

  The three power supply lines 45 include two power supply lines 45a and 45c set with different voltages and a DC return power supply line 45b. Here, a case is shown in which a -48V line 45a for transmitting -48V power and a 10-30V line 45c for transmitting 10-30V power are provided.

  The three power supply lines 45 are arranged around the two control signal lines 44 (around the shield tape 47) together with the intervening 48, and the shield tape 49, the braided shield 50, and the sheath 51 so as to surround them all together. Are provided sequentially.

  The control cable 15 in FIG. 2 is shown as an example only, and the control cable 15 is not limited to the configuration in FIG. For example, in the antenna control system 1 of FIG. 1A, the control cable 15 provided between the antenna modem 14 and the AISG device 17 does not use the −48V line 45a, and therefore uses the one that omits the −48V line 45a. It is also possible.

  Returning to FIG. 1A, a male connector 15a and a female connector 15b are provided at both ends of the control cable 15, respectively. The control device 16 is provided with an output connector (female connector) 16a, and the AISG device 17 is provided with an input connector (male connector) 17a. These connectors 15a, 15b, 16a, and 17a are general connectors (AISG connectors) conforming to the AISG standard. Although not shown, the AISG device 17 is provided with an output connector (female connector) so that a plurality of AISG devices 17 can be connected in a daisy chain.

  By connecting the male connector 15a of the control cable 15 to the output connector 16a of the control device 16 and connecting the female connector 15b of the control cable 15 to the input AISG connector 21 of the BS modem 13, the control device 16 and the BS modem 13 are connected. Are connected via the control cable 15. The power supply line 12 extending from the wireless device 11 is connected to the input side RF connector 25 of the BS modem 13, whereby the wireless device 11 and the BS modem 13 are connected via the power supply line 12.

  Further, by connecting the male connector 15a of the control cable 15 to the output AISG connector 36 of the antenna modem 2, and connecting the female connector 15b of the control cable 15 to the input connector 17a of the AISG device 17, the antenna modem 2 and the AISG device are connected. 17 is connected through a control cable 15. In addition, the power supply line 12 extending to the antenna 10 is connected to the output-side RF connector 33 of the antenna modem 2, whereby the antenna modem 2 and the antenna 10 are connected via the power supply line 12.

  Furthermore, one end of the feed line 12 is connected to the output-side RF connector 26 of the BS modem 13, and the other end of the feed line 12 is connected to the input-side RF connector 31 of the antenna modem 2. The modem 2 is connected via the feeder line 12.

  Next, the antenna modem 2 will be described.

  As shown in FIG. 1B, the antenna modem 2 separates the modulation signal and the power signal from the power feeding signal input from the BS modem 13 via the input side RF connector 31 (that is, the AISG signal is separated from the power feeding signal). A bias T circuit 32 that outputs the separated power supply signal from the output-side RF connector 33 to the power supply line 12 on the antenna 10 side, a modulation signal and a power signal separated by the bias T circuit 32, and A separation circuit 34 that separates the signals separately (that is, separates the AISG signal into a modulation signal and a power supply signal), demodulates the modulation signal separated by the separation circuit 34, and returns the control signal to the output AISG connector 36. And a modem (modem circuit) 35 that outputs to the AISG device 17.

  The output of the modulation signal of the separation circuit 34 is electrically connected to the modulation signal input / output unit (directional coupler) of the modem 35 through an internal wiring, and the control signal input / output unit (RS485 interface) of the modem 35 is The output AISG connector 36 is electrically connected to the third and fifth pin terminals (RS485A, RS485B) of the output AISG connector 36, and the demodulated control signal is output from the output AISG connector 36. The modem 35 is the same as that described in FIG.

  The antenna modem 2 according to the present embodiment is a first DC / DC converter compatible with both positive and negative power inputs that can generate a power signal of a predetermined voltage regardless of whether a positive power source or a negative power source is input. 3 from the power signal (the power signal of an unknown voltage supplied from the control device 16 via the BS modem 13) input from the BS modem 13 and separated from the power supply signal by the first DC / DC converter 3. A power supply signal (here, 10 to 30 V power supply) having a predetermined voltage defined by the standard is generated and output to the AISG device 17.

  More specifically, the first DC / DC converter 3 generates a power supply signal (here, 10 to 30 V power supply) having a predetermined voltage defined by the AISG standard from the power supply signal separated by the separation circuit 34. The output AISG connector 36 is configured to output to the AISG device 17. As the first DC / DC converter 3, a positive / negative power supply input compatible and input / output insulation type is used.

  One input terminal of the first DC / DC converter 3 (the input terminal has no polarity because it is compatible with both positive and negative power supply inputs) is electrically connected to the output of the power supply signal of the separation circuit 34 by the internal wiring, Although not shown, the input terminal is electrically connected to a pin terminal of No. 7 (DC return) of the output AISG connector 36, that is, a DC return line. Further, the positive terminal of the output terminal of the first DC / DC converter 3 is electrically connected to the 6th (10 to 30 V DC) pin terminal of the output AISG connector 36 by internal wiring, and the negative terminal of the output terminal is illustrated. Although not, it is electrically connected to the pin terminal of the output AISG connector 36 (DC return). Further, the positive terminal of the output terminal of the first DC / DC converter 3 is electrically connected to the power circuit of the modem 35, and is configured to supply the modem 35 with the power generated by the first DC / DC converter 3.

  Here, the input / output insulation type is used as the first DC / DC converter 3, but the other input terminal and the negative terminal of the output terminal are both electrically connected to the DC return line. It is also possible to use one in which the child is electrically connected inside. In this case, any one of the other input terminal and the negative electrode of the output terminal may be configured to be electrically connected to the DC return line.

  In this embodiment, since the power supply voltage supplied by the control device 16 is unknown, the power supply signal separated by the separation circuit 34 is not output to the outside, and the power supply signal (10 to 10) generated by the first DC / DC converter 3 is output. The antenna modem 2 is configured to output only the 30 V power source) to the AISG device 17. Note that the power signal generated by the first DC / DC converter 3 is not limited to the 10 to 30 V power source, and may be a +12 V power source or a −48 V power source depending on the power source used by the AISG device 17.

  In the present embodiment, the first DC / DC converter 3 is compatible with both positive and negative power supplies. However, as shown in FIG. 3, the first DC / DC converter 3 is compatible with only one of the positive power supply and the negative power supply. An input that uses the DC / DC converter 37 and inverts and outputs the polarity of the input power signal when a power signal having a polarity that is not supported by the DC / DC converter 37 that supports the single power input is input to the preceding stage. By providing the switching circuit 38, both positive and negative power supply inputs may be supported.

  Note that the voltage input to the DC / DC converter 37 corresponding to the single power supply input is rectified by the input switching circuit 38 and becomes about 10 to 48 V. Therefore, the DC / DC converter 37 has an input voltage of about 10 to 48 V. It is sufficient to use one that can correspond to the above range.

  Although FIG. 3 shows a case where the input switching circuit 38 is configured by a diode bridge including four diodes 39a to 39d, the configuration of the input switching circuit 38 is not limited to this.

  In the example of FIG. 3, when a positive power supply (10 to 30 V power supply or +12 V power supply) is input, the diodes 39 a and 39 d are forward biased and the diodes 39 b and 39 c are reverse biased. The power supply line extending from the output of the power supply signal is electrically connected to the positive terminal (Vin (+)) of the input terminal of the DC / DC converter 37, and the DC return line is electrically connected to the negative terminal (Vin (−)) of the input terminal of the DC / DC converter 37. Will be connected to. When a negative power supply (−48V power supply) is input, the diodes 39a and 39d are reverse-biased and the diodes 39b and 39c are forward-biased, so that the polarity of the power supply signal is inverted and the power supply line is connected to the DC power supply. The DC return line is electrically connected to the negative terminal (Vin (−)) of the input terminal of the DC / DC converter 37 and the positive terminal (Vin (+)) of the input terminal of the DC / DC converter 37.

  In the present embodiment, the antenna modem 2 has one first DC / DC converter 3 and outputs only one type of power source (here, 10 to 30 V power source). However, for example, +12 V is obtained by daisy chain connection. When there is a possibility of further using the AISG device 17 that uses a power supply, as shown in FIG. 4A, from the power supply signal (here, 10 to 30 V power supply) generated by the first DC / DC converter 3, A second DC / DC converter 4 for generating a power signal of another voltage specified in the AISG standard (here, + 12V power supply), and a power signal (10-30V power supply) generated by the first DC / DC converter 3; The power supply signal (+12 V power supply) generated by the second DC / DC converter 4 is configured to be output to the AISG device 17. Good.

  As shown in FIG. 4B, if a second DC / DC converter 4 that generates a -48V power supply is further provided, all three types of power supplies defined by the AISG standard can be output to the AISG device 17. Become.

  Further, as shown in FIG. 5 (a), a plurality of (here, two) first DC / DC converters 3 are provided, and the plurality of first DC / DC converters 3 are input from the BS modem 13 and separated from the feed signal. A configuration is made such that power signals of different voltages (here, 10 to 30 V power supply and +12 V power supply) are generated from unknown power supply signals at voltages specified by the AISG standard and output to the AISG device 17. Is also possible.

  At this time, when using the first DC / DC converter 3 provided with the input switching circuit 38 in the previous stage of the DC / DC converter 37 corresponding to the single power supply input as described in FIG. As shown in the figure, the input switching circuit 38 may be shared, and two DC / DC converters 37 corresponding to the single power supply inputs may be connected in parallel at the subsequent stage of the input switching circuit 38.

  If the antenna modem 2 shown in FIG. 5 (a) is further provided with the first DC / DC converter 3 that generates a -48V power supply, the antenna modem 2 shown in FIG. 4 (b) is defined by the AISG standard. All three types of power supplies can be output to the AISG device 17. Further, in the antenna modem 2 of FIG. 5A, a second DC / DC converter that generates a −48V power source from the power signal generated by the first DC / DC converter 3 at the subsequent stage of any of the first DC / DC converters 3. 4, all three types of power supplies can be output to the AISG device 17.

  Furthermore, as shown in FIG. 6A, when the voltage of the power signal input from the BS modem 13 and separated from the power supply signal is substantially equal to the voltage generated by the first DC / DC converter 3, the generated voltage is The same first DC / DC converter 3 may be bypassed, and the output switching circuit 5 that directly outputs the power signal input from the BS modem 13 and separated from the power supply signal to the AISG device 17 may be provided.

  As shown in FIGS. 6A and 6B, the output switching circuit 5 includes a first input terminal 52 to which the output of the power signal of the separation circuit 34 is electrically connected, and an output of the first DC / DC converter 3. A second input terminal 53 to which a terminal (positive terminal of the output terminal) is electrically connected, an output terminal 54 to be electrically connected to the output AISG connector 36 (No. 6 pin terminal), and a first input terminal 52 An output changeover switch 55 such as a relay for switching whether to electrically connect the output terminal 54 or to electrically connect the second input terminal 53 and the output terminal 54, and input from the first input terminal 52 And an input voltage detection circuit 56 that controls the output changeover switch 55 in accordance with the voltage value.

  The input voltage detection circuit 56 is configured to operate with power supplied from the second input terminal 53 (power generated by the first DC / DC converter 3), and the value of the voltage input from the first input terminal 52 is If within a predetermined range set in advance (a value in the vicinity of the voltage generated by the first DC / DC converter 3), the output changeover switch 55 so as to electrically connect the first input terminal 52 and the output terminal 54. Configured to control. The determination of whether or not the input voltage value is within a predetermined range may be performed by a window comparator.

  By providing the output switching circuit 5, when the power supply voltage input from the control device 16 via the BS modem 13 is substantially equal to the voltage generated by the first DC / DC converter 3, the first DC / DC converter 3 is bypassed. Thus, it is possible to directly output the input power, and it is possible to suppress useless power loss in the first DC / DC converter 3. In the case where a plurality of first DC / DC converters 3 are provided as shown in FIG. 5A, an output switching circuit 5 may be provided for each first DC / DC converter 3.

  Further, as shown in FIG. 7, the surge protection circuit 6 is provided in the vicinity of the output AISG connector 36, and the internal circuit (the first DC / DC converter 3, the modem 35, etc.) is protected from a surge voltage such as a lightning surge. May be.

  The operation of the present embodiment will be described.

  In the antenna control system 1 according to the present embodiment, the antenna modem 2 includes a first DC / DC converter 3 that supports both positive and negative power supply inputs, and is input from the BS modem 13 and separated from the feed signal by the first DC / DC converter 3. A power signal having a predetermined voltage defined by the AISG standard is generated from the power signal thus generated and is output to the AISG device 17.

  Conventionally, the coaxial interface type antenna control system can transmit only one type of power, so if the power supply voltage transmitted by the coaxial interface method, that is, the power supply voltage supplied by the control device 16 is unknown, However, according to the present invention, a DC / DC converter corresponding to both positive and negative power supply inputs can be provided in the antenna modem 2. 3, the antenna modem 2 can generate a power supply with a predetermined voltage regardless of the power supply voltage transmitted by the coaxial interface method, and the downstream side of the antenna modem 2 (the side opposite to the control device 16). Can always use a power supply of a predetermined voltage.

  That is, according to the present invention, it is possible to connect and use the AISG device 17 that uses any power supply voltage regardless of the power supply voltage supplied by the coaxial interface method.

  The present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Antenna control system 2 Antenna modem 3 1st DC / DC converter 4 2nd DC / DC converter 5 Output switching circuit 10 Antenna 11 Radio equipment 12 Feed line 13 BS modem 15 Control cable 16 Controller 17 AISG device 38 Input switching circuit

Claims (6)

An AISG device that controls the antenna in accordance with the AISG standard;
A control device that transmits a control signal to the AISG device, controls the AISG device to control the antenna, and transmits a power signal to the AISG device;
Provided in the middle of a feed line connecting the antenna and a radio that feeds the antenna, the control device is connected, and modulates a control signal input from the control device to generate a modulation signal, A BS modem that superimposes the modulation signal and the power supply signal input from the control device on the power supply signal input from the radio, and outputs the signal to the power supply line on the antenna side,
It is provided in the middle of the power supply line on the antenna side of the BS modem, and the AISG device is connected to separate the modulation signal and the power signal from the power supply signal input from the BS modem. An antenna modem that demodulates and returns to the control signal, outputs the control signal and the power signal to the AISG device, and outputs the separated feed signal to the feed line on the antenna side;
In an antenna control system with
The antenna modem is
A first DC / DC converter corresponding to both positive and negative power inputs capable of generating a power signal of a predetermined voltage regardless of whether a positive power source or a negative power source is input;
The first DC / DC converter generates a power signal having a predetermined voltage defined by the AISG standard from a power signal input from the BS modem and separated from the power supply signal, and outputs the power signal to the AISG device. An antenna control system characterized in that The first DC / DC converter includes:
When a power signal having a polarity not supported by the DC / DC converter corresponding to the single power input is input to the preceding stage of the DC / DC converter corresponding to the single power input corresponding to only one of the positive power supply and the negative power supply, The antenna control system according to claim 1, further comprising an input switching circuit that inverts and outputs the polarity of the input power signal. The antenna modem is
A second DC / DC converter that generates a power signal of another voltage specified by the AISG standard from the power signal generated by the first DC / DC converter;
The antenna control system according to claim 1 or 2, wherein the antenna control system is configured to output the power signal generated by the first DC / DC converter and the power signal generated by the second DC / DC converter to the AISG device. The antenna modem is
A plurality of the first DC / DC converters, wherein the plurality of first DC / DC converters have a voltage specified by the AISG standard and a different voltage from a power signal input from the BS modem and separated from the power feeding signal. The antenna control system according to any one of claims 1 to 3, wherein each power supply signal is generated and output to the AISG device. The antenna modem is
When the voltage of the power signal input from the BS modem and separated from the power supply signal is equal to the voltage generated by the first DC / DC converter, the BS modem bypasses the first DC / DC converter having the same generated voltage. The antenna control system according to any one of claims 1 to 4, further comprising: an output switching circuit that directly outputs a power signal input from the power supply and separated from the power feeding signal to the AISG device. An AISG device that controls the antenna in accordance with the AISG standard;
A control device that transmits a control signal to the AISG device, controls the AISG device to control the antenna, and transmits a power signal to the AISG device;
Provided in the middle of a feed line connecting the antenna and a radio that feeds the antenna, the control device is connected, and modulates a control signal input from the control device to generate a modulation signal, An BS control system comprising: a BS modem that superimposes the modulation signal and the power supply signal input from the control device on the power supply signal input from the wireless device and outputs the signal to the power supply line on the antenna side Used for
It is provided in the middle of the power supply line on the antenna side of the BS modem, and the AISG device is connected to separate the modulation signal and the power signal from the power supply signal input from the BS modem. An antenna modem that demodulates and returns to the control signal, outputs the control signal and the power signal to the AISG device, and outputs the separated feeding signal to the feeding line on the antenna side,
A first DC / DC converter corresponding to both positive and negative power inputs capable of generating a power signal of a predetermined voltage regardless of whether a positive power source or a negative power source is input;
The first DC / DC converter generates a power signal having a predetermined voltage defined by the AISG standard from a power signal input from the BS modem and separated from the power supply signal, and outputs the power signal to the AISG device. An antenna modem characterized by being