JP2013017041A - Aisg device power supply circuit, and aisg device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an AISG device power supply circuit and an AISG device capable of handling a plurality of power supplies and automatically selecting a power supply line having high power efficiency depending on a state of a power supply supplied from the outside.SOLUTION: An AISG device power supply circuit mounted on an AISG device 1 controlling an antenna compliantly to the AISG standard comprises a DC/DC converter 4 outputting voltage of a power supply supplied from the outside after adjusting the voltage to an internal circuit 3 of the AISG device 1, where positive and negative electrodes of an input terminal of the DC/DC converter 4 are electrically connected to a 10-30 V power supply line for mandatory connection and a DC return line respectively. The AISG device power supply circuit further comprises a switching circuit 10 switching a connection destination of the negative electrode of the input terminal of the DC/DC converter 4 from the DC return line to a -48 V power supply line when a -48 V power supply is supplied from the outside.

Description

  The present invention relates to an AISG device power supply circuit and an AISG device mounted on an AISG device that controls an antenna in conformity with the 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).

  As shown in FIG. 5A, an antenna control system 51 that controls an antenna in accordance with the AISG standard includes a RET (Remote Electrical Tilt) unit that controls an antenna (not shown) of a radio base station. Control that transmits an AISG device (AISG terminal device) 52 and a control signal (RS-485 standard signal) to the AISG device 52, controls the AISG device 52 to control the antenna, and supplies power to the AISG device 52 The apparatus (AISG control apparatus) 53 and the control cable (AISG control cable) 54 which connects the control apparatus 53 and the AISG device 52 are provided. Although not shown, the control cable 54 includes a control signal line for transmitting a control signal and a power supply line for supplying power.

  Pin number of the connector specified by the AISG standard (Pin Number), signal propagated at each pin terminal (Signal), request for mandatory connection (Mandatory) or optional connection (Optional) (Requirement) ) Is shown in Table 1.

  As shown in Table 1, in the AISG standard, there are three types of power lines: + 12V for No. 2, -48V for No. 2, and 10-30V for No. 6, and + 12V and -48V power lines can be connected arbitrarily. , 10-30V power line is essential connection. In Table 1, No. 8 NC means no connection.

  By the way, as shown in FIG. 5B, generally, the voltage of the power source supplied from the outside is adjusted and output to the AISG device 52 for the internal circuit (AISG device internal circuit) 55 of the AISG device 52. An AISG device power supply circuit 56 is provided.

  The conventional power supply circuit 56 for the AISG device includes a DC / DC converter 57 that adjusts and outputs the voltage of the power supply supplied from the outside for the internal circuit 55 of the AISG device 52, and inputs the DC / DC converter 57. The positive terminal (Vin (+)) of the terminal is electrically connected to the 10-30V power supply line which is an essential connection, and the negative terminal (Vin (−)) of the input terminal is electrically connected to the DC return line. The positive terminal and the negative terminal (Vout (+) and Vout (−)) of the output terminal are electrically connected to the internal circuit 55, respectively, and the negative terminal (Vout (−)) of the output terminal is electrically connected to the DC return line. It is connected.

  FIG. 5B shows a case where a 10 to 30 V power supply line is used. However, when a +12 V power supply line is used, the positive terminal (Vin (+)) of the input terminal of the DC / DC converter 57 is set to +12 V. What is necessary is just to electrically connect to a power supply line, and when using a -48V power supply line, the positive terminal (Vin (+)) of the input terminal of the DC / DC converter 57 is made into a DC return line, and the negative terminal (Vin) of an input terminal. (-)) May be electrically connected to the -48V power line.

Special table 2010-519844 gazette

  By the way, if the voltage is increased, a large amount of power can be supplied even with a small current, and it is possible to improve the power efficiency of the entire antenna control system by suppressing the voltage drop due to the resistance component of the control cable, that is, the power loss. Therefore, from the viewpoint of improving the power efficiency, it is desirable to use a power supply line of −48V having the largest specified voltage value (absolute value).

  However, since the conventional power supply circuit for AISG devices does not support multiple power supplies, the power supply circuit for AISG devices that uses a -48V power supply line can support an antenna control system that does not use a -48V power supply line. There is a problem of disappearing.

  Although the AISG standard provides three types of power lines (10-30V, + 12V, -48V) as described above, the current existing antenna control system has a power supply of 10-30V, which is an essential connection. In many cases, only the line is used, and the arbitrarily connected -48V or + 12V power line is not used. Since whether or not the -48V power line is connected depends on the system used, the AISG device using the -48V power line is very difficult to use.

  The present invention has been made in view of the above circumstances, and can support a plurality of power supplies, and can automatically select a power supply line with high power efficiency according to the state of the power supply supplied from the outside. An object is to provide a power supply circuit for a device and an AISG device.

  The present invention was devised to achieve the above object, and is mounted on an AISG device that controls an antenna in accordance with the AISG standard. The voltage of a power source supplied from the outside is used as an internal circuit of the AISG device. A DC / DC converter that adjusts the output for output, and the positive terminal of the input terminal of the DC / DC converter is electrically connected to the 10 to 30 V power line, which is an essential connection, and the negative terminal of the input terminal is electrically connected to the DC return line. Switching circuit for switching the negative electrode connection destination of the DC / DC converter from the DC return line to the -48V power line when -48V power is supplied from the outside Is a power circuit for an AISG device.

  The switching circuit branches from a negative-side internal wiring that electrically connects the negative electrode of the input terminal of the DC / DC converter and the DC return line, and is negatively connected to the -48V power line. A branch line between the side branch line, the negative side internal line and the negative side branch line, provided on the negative side internal line on the opposite side of the DC / DC converter, from the DC return line side to the − And a negative electrode side switching diode that cuts off a current flowing to the 48V power supply line side.

  The switching circuit branches from a positive-side internal wiring that electrically connects the positive electrode of the input terminal of the DC / DC converter and the power line of 10 to 30 V, and is electrically connected to the DC return line. You may further provide a positive electrode side branch wiring and the positive electrode side switching diode which is provided in the said positive electrode side branch wiring, and interrupts | blocks the electric current which flows from the said 10-30V power supply line side to the said DC return line side.

  The switching circuit is provided on the positive-side second branch wiring, which is further branched from the positive-side internal wiring and is electrically connected to a + 12V power supply line, and the positive-side second branch wiring, and the 10-30V And a positive electrode side second switching diode that cuts off a current flowing from the power line side to the +12 V power line side.

  Further, the present invention is an AISG device equipped with the above-described power supply circuit for an AISG device.

  According to the present invention, it is possible to provide a power circuit for an AISG device and an AISG device that can support a plurality of power supplies and can automatically select a power supply line with high power efficiency according to the state of the power supplied from the outside. it can.

It is a schematic block diagram of the AISG device carrying the power supply circuit for AISG devices which concerns on one embodiment of this invention. FIG. 4 is a diagram for explaining the operation of the power supply circuit for the AISG device in FIG. 1, where (a) shows the flow of power supply current when −48V power is not supplied, and (b) shows the flow of power supply current when −48V power is supplied. It is a figure explaining. It is a schematic block diagram of the AISG device carrying the power supply circuit for AISG devices which concerns on other embodiment of this invention. It is a schematic block diagram of the AISG device carrying the power supply circuit for AISG devices which concerns on other embodiment of this invention. (A) is a schematic block diagram of a general antenna control system, (b) is a schematic block diagram of an AISG device equipped with a conventional power supply circuit for an AISG device.

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

  FIG. 1 is a schematic configuration diagram of an AISG device equipped with an AISG device power supply circuit according to the present embodiment.

  As shown in FIG. 1, the AISG device 1 includes an AISG device power supply circuit 2 that adjusts and outputs the voltage of an externally supplied power supply for the internal circuit (AISG device internal circuit) 3 of the AISG device 1. It is installed. The AISG device 1 is a RET unit, for example, and controls an antenna in accordance with the AISG standard.

  Although not shown, the AISG device 1 is provided with an input connector (male connector) connected to a control device which is a power supply source, and an output connector (female connector) for daisy chain connection. By connecting the device and the input connector with a control cable, a control signal and a power source are input from the control device to the AISG device 1. The input connector and the output connector are general connectors conforming to the AISG standard, and the pin terminals Nos. 1 to 8 of both connectors are electrically connected inside the AISG device 1. In FIG. 1, the diagram is simplified, and from the upper side to the lower side of FIG. 1, a pin terminal (10-30V) to which a 10-30 V power line is connected and a −48 V power line are connected 2 Only the number pin terminal (-48V) and the number 7 pin terminal (DC return) to which the DC return line is connected are shown.

  The AISG device power supply circuit 2 includes a DC / DC converter 4 that adjusts and outputs the voltage of the power supplied from the outside (control device) for the internal circuit 3 of the AISG device 1. That is, the DC / DC converter 4 generates a supply voltage for the internal circuit 3 of the AISG device 1. As the DC / DC converter 4, an input / output insulation type is used.

  The positive terminal (Vin (+)) of the input terminal of the DC / DC converter 4 is electrically connected to the essential power supply line of 10 to 30V, that is, the 6th pin terminal by the positive internal wiring 5. . The negative terminal (Vin (−)) of the input terminal of the DC / DC converter 4 is electrically connected to the DC return line, that is, the 7th pin terminal by the negative internal wiring 6.

  The positive terminal (Vout (+)) of the output terminal of the DC / DC converter 4 is electrically connected to the internal circuit 3 by the positive output wiring 7, and the negative terminal (Vout (−) of the output terminal of the DC / DC converter 4. )) Is electrically connected to the internal circuit 3 by the negative output wiring 8. The negative output wiring 8 branches at a branch point A on the way to the internal circuit 3, and the branched bypass wiring 9 is electrically connected to the negative internal wiring 6 at the junction B. Thus, the negative terminal (Vout (−)) of the output terminal of the DC / DC converter 4 is electrically connected to the DC return line.

  Now, the AISG device power supply circuit 2 according to the present embodiment is configured such that when the -48V power supply is supplied from the outside, the connection destination of the negative terminal (Vin (-)) of the input terminal of the DC / DC converter 4 is the DC A switching circuit 10 is provided for switching from the return line to the -48V power line.

  The switching circuit 10 includes a negative side branch wiring 11 and a negative side switching diode 12.

  The negative-side branch wiring 11 is a branch point C from the negative-side internal wiring 6 that electrically connects the negative terminal (Vin (−)) of the input terminal of the DC / DC converter 4 and the DC return line (No. 7 pin terminal). Branches at, and is wired so as to be electrically connected to the -48V power line (No. 2 pin terminal). The branch point C is adjusted so that the bypass wiring 9 is positioned closer to the DC / DC converter 4 than the junction B where the bypass wiring 9 joins the negative side internal wiring 6.

  The negative side switching diode 12 is provided in the negative side internal wiring 6 opposite to the DC / DC converter 4 (that is, the input side) with respect to the branch point C between the negative side internal wiring 6 and the negative side branch wiring 11. Further, the negative electrode side switching diode 12 is provided closer to the DC / DC converter 4 than the junction B. That is, the negative electrode side switching diode 12 is provided in the negative electrode side internal wiring 6 between the branch point C and the junction point B. The negative side switching diode 12 is provided so as to cut off the current flowing from the DC return line side to the -48V power supply line side.

  In the present embodiment, the switching circuit 10 further includes a negative-side backflow prevention diode 13 provided in the negative-side branch wiring 11. The negative side backflow prevention diode 13 is provided so as to cut off the current flowing from the −48 V power supply line side to the DC / DC converter 4 side.

  Next, the operation of the AISG device power supply circuit 2 will be described.

  As shown in FIG. 2 (a), when only 10-30V power is supplied from the outside and -48V power is not supplied, the second pin terminal to which the -48V power line is connected is opened. The negative side switching diode 12 is forward-biased. Therefore, the power source current is supplied from the 6th pin terminal to which the 10-30V power line is connected as shown by the arrow in the figure, from the positive side internal wiring 5, the DC / DC converter 4, and the negative side internal wiring 6 (branch point C). , The negative side switching diode 12 and the junction B), and then flows to the 7th pin terminal to which the DC return line is connected.

  On the other hand, as shown in FIG. 2B, when both the 10-30V power source and the −48V power source are supplied from the outside, the negative side switching diode 12 is reverse-biased and merges with the branch point C. The negative side internal wiring 6 between the points B is cut off. Therefore, the power source current is supplied from the 6th pin terminal to which the 10-30V power line is connected as shown by the arrow in the figure, from the positive side internal wiring 5, the DC / DC converter 4, and the negative side internal wiring 6 (branch point C). To the second pin terminal to which the -48V power supply line is connected through the negative-side branch wiring 11 (negative-side backflow prevention diode 13).

  For example, assuming that the voltage of the 10-30V power supply is 24V, when the -48V power supply is not supplied as shown in FIG. 2A, the voltage between the positive terminal and the negative terminal of the input terminal of the DC / DC converter 4 is 24V. A voltage is applied. On the other hand, when -48V power is supplied as shown in FIG. 2B, a high voltage of 72V + 48V, 72V + 48V, is applied between the positive and negative electrodes of the input terminal of the DC / DC converter 4. Will be. Since the power consumed by the DC / DC converter 4 is substantially constant, the higher the voltage, the smaller the power supply current. As a result, the voltage drop (power loss) due to the resistance component of the control cable is suppressed, It becomes possible to increase the power efficiency of the entire system.

  In the power circuit 2 for AISG device of the present invention, the voltage input to the DC / DC converter 4 varies depending on the state of the power supplied from the outside, so the DC / DC converter 4 supports a wide range of input voltages. It is necessary to use what can be done. Examples of such a DC / DC converter 4 having a wide input voltage range include MAX5014 and MAX5015 manufactured by MAXIM.

  As described above, in the AISG device power supply circuit 2 according to the present embodiment, the connection of the negative terminal (Vin (−)) of the input terminal of the DC / DC converter 4 when −48 V power is supplied from the outside. A switching circuit 10 is provided for switching the destination from the DC return line to the -48V power line.

  By providing the switching circuit 10, not only the case where only the 10 to 30 V power supply which is an essential connection is supplied, but also the −48 V power supply is effectively used when the −48 V power supply is supplied. Thus, the power efficiency of the entire system can be improved.

  That is, according to the present invention, the AISG device power supply circuit 2 that can handle a plurality of power supplies and can automatically select a power supply line with high power efficiency according to the state of the power supplied from the outside is realized. it can.

  In the present embodiment, the switching circuit 10 is composed of the negative branch wiring 11, the negative switching diode 12, and the negative backflow prevention diode 13, and the DC return line and the −48V power supply line are divided into two. By connecting the diodes 12 and 13, the line through which the power supply current flows is automatically switched depending on whether or not the -48V power is supplied. Since the switching circuit 10 is composed only of inexpensive diodes and wiring, the switching circuit 10 is very low cost and can be easily incorporated into an existing AISG device power supply circuit.

  The AISG device 1 equipped with the power supply circuit 2 for the AISG device of the present invention is compatible with a plurality of power supplies, and is therefore highly versatile.

  Next, another embodiment of the present invention will be described.

  The AISG device 31 shown in FIG. 3 is configured with the switching circuit 33 of the power supply circuit 32 for the AISG device so that it can cope with the case where only the −48V power is supplied.

  The switching circuit 33 includes the switching circuit 10 described with reference to FIG. 1 and further includes a positive branch wiring 34, a positive switching diode 35, and a positive backflow prevention diode 36.

  The positive-side branch wiring 34 is connected to the positive-side internal wiring 5 that electrically connects the positive terminal (Vin (+)) of the input terminal of the DC / DC converter 4 and the power line (No. 6 pin terminal) of 10 to 30V. It branches at the branch point D and is wired so as to be electrically connected to the DC return line (No. 7 pin terminal). Here, the positive branch line 34 extending from the branch point D was electrically connected to the negative internal wiring 6 on the input side (the 7th pin terminal side) from the junction B. A connection point between the positive branch line 34 and the negative internal wiring 6 is referred to as a branch point E.

  The positive side switching diode 35 is provided in the positive side branch wiring 34 and is provided so as to cut off the current flowing from the 10-30 V power supply line side to the DC return line side.

  The positive side backflow prevention diode 36 is provided on the positive side internal wiring 5 on the input side (No. 6 pin terminal side) from the branch point D, and flows from the DC / DC converter 4 side to the power line side of 10 to 30V. It is provided to cut off the current.

  In the power supply circuit 32 for the AISG device, when 10 to 30 V power is supplied, the positive side switching diode 35 is reverse-biased and the positive side branch wiring 34 is cut off. When only the 10-30V power supply is supplied, the operation when both the 10-30V power supply and the -48V power supply are supplied is the same as the above-described AISG device power supply circuit 2.

  On the other hand, when the 10-30V power supply is not supplied and only the -48V power supply is supplied, the 6th pin terminal to which the 10-30V power supply line is connected is opened, and the positive side switching diode 35 is in the forward direction. Biased. Therefore, the power source current is from the 7th pin terminal to which the DC return line is connected to the negative side internal wiring 6 (up to the branch point E), the positive side branch wiring 34 (positive side switching diode 35), and the positive side internal wiring 5 (DC / DC converter 4 side from branch point D), DC / DC converter 4, negative side internal wiring 6 (up to branch point C), negative side branch wiring 11 (negative side backflow prevention diode 13), -48V Current flows to the second pin terminal to which the power line is connected.

  According to the AISG device power supply circuit 32 of FIG. 3, when only 10-30V power is supplied, in addition to the case where both 10-30V power and -48V power are supplied, only -48V power is supplied. It is also possible to cope with the case where it is supplied.

  The AISG device 41 shown in FIG. 4 further includes a switching circuit 43 of the AISG device power supply circuit 42 so as to cope with the case where +12 V power is supplied.

  The switching circuit 43 includes the switching circuit 33 described with reference to FIG. 3 and further includes a positive-side second branch wiring 44 and a positive-side second switching diode 45.

  The positive-side second branch wiring 44 is further branched from the branch point D of the positive-side internal wiring 5 so as to be electrically connected to the + 12V power line (the first pin terminal).

  The positive side second switching diode 45 is provided on the positive side second branch wiring 44 and is provided so as to cut off the current flowing from the 10-30V power line side to the + 12V power line side.

  In the AISG device power supply circuit 42, when either 10-30V power supply or + 12V power supply is supplied, the supplied power supply is used as the positive terminal (Vin (+)) of the input terminal of the DC / DC converter 4. When both the 10-30V power supply and the + 12V power supply are supplied, the higher voltage of the two power supplies is connected to the positive terminal (Vin (+)) of the input terminal of the DC / DC converter 4. Will be electrically connected.

  Therefore, according to the power supply circuit 42 for the AISG device, the AISG device 41 can operate even when only one of the 10-30V power supply, the −48V power supply, and the + 12V power supply is supplied. The supplied maximum potential difference can be used as the input power source of the DC / DC converter 4, and as a result, the current flowing in the power supply line is reduced, the voltage drop due to the resistance component of the control cable is suppressed, and the entire system is Power efficiency can be increased.

  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 AISG device 2 Power supply circuit for AISG device 3 Internal circuit 4 DC / DC converter 5 Positive side internal wiring 6 Negative side internal wiring 10 Switching circuit 11 Negative side branch wiring 12 Negative side switching diode 13 Negative side backflow prevention diode 34 Positive side Branch wiring 35 Positive side switching diode 44 Positive side second branch wiring 45 Positive side second switching diode

Claims (5)

Installed in AISG devices that control antennas in accordance with AISG standards,
A DC / DC converter that adjusts and outputs the voltage of the power source supplied from the outside for the internal circuit of the AISG device, and the positive terminal of the input terminal of the DC / DC converter is an essential connection of 10 to 30V. In the power circuit for the AISG device in which the negative electrode of the input terminal is electrically connected to the DC return line, respectively,
An AISG device comprising a switching circuit for switching a negative electrode connection destination of the input terminal of the DC / DC converter from a DC return line to a -48V power line when -48V power is supplied from the outside. Power supply circuit. The switching circuit is
A negative-side branch wiring that branches from a negative-side internal wiring that electrically connects the negative terminal of the input terminal of the DC / DC converter and the DC return line, and that is electrically connected to the -48V power line;
Provided in the negative internal wiring on the opposite side of the DC / DC converter with respect to the branch point between the negative internal wiring and the negative branch wiring, and from the DC return line side to the -48V power line side The power supply circuit for an AISG device according to claim 1, further comprising: a negative electrode side switching diode that cuts off a current flowing to the AIS device. The switching circuit is
A positive branching line that branches from a positive internal wiring that electrically connects the positive terminal of the input terminal of the DC / DC converter and the power line of 10 to 30 V, and is electrically connected to the DC return line; ,
The power circuit for an AISG device according to claim 2, further comprising: a positive-side switching diode that is provided in the positive-side branch wiring and cuts off a current flowing from the 10-30 V power line side to the DC return line side. The switching circuit is
A second branch wiring that is further branched from the positive-side internal wiring and is electrically connected to a power supply line of +12 V;
The AISG according to claim 3, further comprising: a positive-side second switching diode that is provided in the positive-side second branch wiring and blocks a current flowing from the 10 to 30 V power line side to the +12 V power line side. Device power circuit.   An AISG device comprising the power supply circuit for an AISG device according to claim 1.

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