JP2013093701A - Power control apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately set power of each of wave signals to be combined without considerably modifying and complicating the configuration regarding a power control apparatus which sets power of any one of a plurality of wave signals to a value suited to a degree of impedance matching in a line used for delivering a synthetic wave resulting from combining the plurality of wave signals.SOLUTION: A power control apparatus sets power of wave signals to be generated by any one of a plurality of signal sources to a value Lev suited to a degree of impedance matching in a line used for delivering a synthetic wave of wave signals generated by the plurality of signal sources. The power control apparatus comprises monitor means which monitors the power set individually by all or a part of other signal sources than the one signal source among the plurality of signal sources, and other system cooperation means which sets the value Lev to a value Lopt matched to the combination of power monitored by the monitor means.

Description

  The present invention relates to a power control apparatus that sets the power of any one of these wave signals to a value suitable for the degree of impedance matching of a line used to deliver a synthesized wave obtained by synthesizing a plurality of wave signals.

For the transmission system that transmits a composite wave of transmission waves generated by a plurality of transmitters, for example, depending on the degree of impedance matching of the antenna system and the power supply path, the power of the transmission waves generated by each of these transmitters Is provided for each transmitter.
FIG. 3 is a diagram illustrating a configuration example of a transmission system provided with a conventional power control apparatus.

  In the figure, audio signals are input to the transmission units 30-1 and 30-2, and the outputs of these transmission units 30-1 and 30-2 are connected to the corresponding inputs of the synthesis circuit 41, respectively. The output of the synthesis circuit 41 is connected to the input of the T-type circuit 43 via cascaded directional couplers 42-1 and 42-2. The two coupling ports that the directional couplers 42-1 and 42-2 have individually are connected to the corresponding inputs of the surge protectors 44-1 and 44-2, respectively. The input / output ports of these surge protectors 44-1 and 44-2 are connected to the control terminals of the transmission units 30-1 and 30-2, respectively. The output of the T-type circuit 43 is connected to a power supply path 47 (connected to an aerial line not shown) via the primary side of the current transformer (CT) 45 and the T-type circuit 46, and the power supply path 47 has a carbon gap 48. Is grounded. An ammeter 49 is connected to the secondary side of the current transformer 45.

The transmission unit 30-1 includes the following elements.
(1) Excitation control unit 31-1 connected to the aforementioned input / output port of the surge protector 44-1 and to which the audio signal is input.
(2) A power amplifying unit 32-1 and a bandpass filter (BPF) 33-1 cascaded to the output of the excitation control unit 31-1

  Since the configuration of the transmission unit 30-2 is the same as the configuration of the transmission unit 30-1, in the following, “2” instead of “1” is assigned to the same function and configuration element as a subscript number. The same reference numerals are given, and the description thereof is omitted here.

  In addition, since the surge protectors 44-1 and 44-2 have the same configuration and function, the items common to both of them may correspond to any of the suffix numbers “1” and “2” below. The subscript “c” shown is given instead of the subscript numbers “1” and “2”.

  In the transmission system having such a configuration, the excitation control unit 31-c generates a transmission wave modulated by the above-described audio signal according to the value of the transmission power instructed by the surge protector 44-c and permission / inhibition of transmission. .

The power amplifying unit 32-c amplifies the power of the transmission wave generated in this way.
The band-pass filter 33-c performs a filtering process for passing the component of the occupied bandwidth of the transmission wave to the transmission wave given by the power amplification unit 32-c under the power amplification.

  The synthesizing circuit 41 generates a synthesized wave by synthesizing the transmission waves given by the transmitting units 30-1 and 30-2 under the above filtering process, and generates directional couplers 42-1 and 42-2. The combined wave is fed to an antenna feed point (not shown) via a T-type circuit 43, a current transformer 45, a T-type circuit 46, and a feed path 47.

  Note that the T-type circuits 43 and 46 are configured so that the reactance is appropriately set manually, so that the section from the output of the combining circuit 41 to the current transformer 45 and the section from the current transformer 45 to the power feeding path 47 are set. It is used for impedance matching.

  The carbon gap 48 has, for example, a carbon electrode that is used for discharge of a surge caused by a lightning strike on an aerial line. Even if the carbon electrode is locally damaged, no repair or replacement is performed. The position of the corresponding damaged part is physically changed, so that it can be reused, and the T-type circuit 46 and the above-described elements arranged in the preceding stage are protected from failure and destruction.

  The directional coupler 42-c detects a component of a traveling wave and a reflected wave indicating an impedance matching state in a section from the output of the synthesis circuit 41 to the above-described antenna system feeding point.

  The surge protector 44-c evaluates the degree of impedance matching as a standing wave ratio based on the level of the traveling wave and the reflected wave, and determines the excitation control unit 31-c based on the result of the evaluation. The following instructions are given, and the behavior and state of the excitation control unit 31-c according to these instructions are monitored, and such instructions are given appropriately based on the monitoring results.

(1) Acceptance of transmission wave generation (output)
(2) Level (transmission power) L at which a transmission wave should be generated (output)
Therefore, in such a transmission system, each of the individual transmission wave levels included in the combined wave and whether to generate or not are appropriately set and changed according to the impedance matching entity.

In addition, there exist the patent document 1 thru | or the patent document 3 listed below as a prior art relevant to this invention.
(1) “Control for monitoring the output VSWR of a transmitter that outputs a modulated wave having a carrier wave and a sideband, and controlling the transmitter when the monitored VSWR exceeds a predetermined value In a protection device for a transmitter that outputs a signal, a filter unit that suppresses a sideband of a modulated wave detected from the output of the transmitter, a VSWR is calculated from the output of the filter unit, and the calculated VSWR is predetermined. By providing a control signal generation unit that outputs a control signal for controlling the transmitter to the transmitter when the value is exceeded, "frequent protection of the protection device of the transmitter by the high frequency modulation frequency region in AM Protecting device for transmitter characterized by "eliminating operation and improving reliability of protective operation of protective device" ... Patent Document 1

(2) “Electronic device having an operational circuit used in normal times and a standby circuit that replaces the function of the operational circuit when a failure occurs in the operational circuit, and receives electromagnetic waves An antenna, a determination mechanism that determines the occurrence of a lightning strike from a noise component included in an output signal of the antenna, a lightning arrester that prevents a lightning surge from entering the operational circuit within a limit value, and the operational circuit and Supply power to both of the standby system circuits, and stop supplying power to the standby system circuit while continuing to supply power to the operational system circuit when it is determined by the determination mechanism that a lightning strike has occurred Electronic device characterized in that it can protect the standby circuit from lightning surges and suppress the generation of useless downtime.

(3) “A surge absorber element, a bandpass filter circuit, a diode bridge circuit, and a stabilized power supply, wherein the surge absorber element is connected to an output side of the bandpass filter, and the diode bridge circuit and the stabilization "The power supply is connected to the input side of the bandpass filter through a transformer", thereby preventing the transmitter of the radio from being destroyed through the antenna due to the induction of lightning discharge such as induced lightning. Surge protection circuit characterized by ... Patent Document 3

JP 2007-281943 A JP 2009-189168 A JP 2007-259622 A

  By the way, in the above-described conventional example, the level of the above-described combined wave is remarkably lowered during a period in which a surge generated by a lightning strike or the like with respect to the antenna line is discharged through the carbon gap 48.

In such a period, the above-described reflection coefficient Γ indicating the degree of impedance matching has a remarkably small value of the denominator (showing “traveling wave voltage”) of the following equation indicating the reflection coefficient Γ. This is accompanied by a large error.
Reflection coefficient Γ = (Voltage of reflected wave) / (Voltage of traveling wave)

  Even if there is such an error, the surge protector 44-c sets the level of the transmission wave to be generated to a significantly small value or generates the transmission wave with respect to the excitation control unit 31-c. You must direct regulation.

  However, for example, when the antenna base is short-circuited (including a case where the antenna is short-circuited artificially for the purpose of maintenance, testing, etc.), the excitation control units 31-1, 31- are caused by the following factors. There is a high possibility that transmission wave generation (output) performed by either one of the two is not regulated.

(1) Since the response of the power amplifying unit 32-c to the short circuit does not always respond at a sufficiently high speed, the excitation control is performed by the time-out process incorporated in the sequence incorporated in the surge protector 44-c in advance. In many cases, the generation (output) of the transmission wave for the unit 31-c cannot be regulated.

(2) The reflected wave and traveling wave voltages used for the calculation of the reflection coefficient Γ are not transmission waves generated individually by the excitation control units 31-1 and 31-2, but by synthesis of these transmission waves. The surge protectors 44-1 and 44-2 are obtained by detection of the obtained synthesized wave, and the other surge protectors 44-2 and 44-1 give the excitation control units 31-2 and 31-2, respectively. Without identifying the instruction, permission and level of transmission wave generation (output) are set.

(3) The reflected wave and traveling wave voltages that the surge protectors 44-1 and 44-2 refer to as the above-described level setting and acceptance criteria differ in the directional couplers 42-1 and 42- 2, and the responsiveness, characteristics, and calculation accuracy of these surge protectors 44-1 and 44-2 may also vary. Therefore, the order in which the surge protectors 44-1 and 44-2 perform transmission rejection and level setting for the excitation control units 31-1 and 31-2, respectively, is generally not determined.

  An object of the present invention is to provide a power control device that accurately sets the power of individual wave signals to be combined without significant change and complication of the configuration.

  In the present invention, a value Lev that is suitable for the degree of impedance matching of a line used for delivery of a composite wave of wave signals generated by a plurality of signal sources is generated by any one of the plurality of signal sources. In the power control apparatus for setting the power of the power wave signal, the monitoring unit monitors the power set individually by all or part of the plurality of signal sources other than the one signal source. The other-system linkage unit sets the value Lev to a value Lopt that matches the combination of power monitored by the monitoring unit.

  That is, the power value Lev of any wave signal included in the synthesized wave is applied to the present invention individually, so that at least a plurality of signals among the plurality of wave signals that individually generate these wave signals are obtained. It is set to a value Lopt that matches the power combination of the wave signal generated by the source.

According to the present invention, even when there is a deviation in the degree of impedance matching individually identified by a plurality of signal sources and there is a difference in the order or interval in which the deviations are identified, the signal sources individually Any of the powers of the wave signals generated in (1) is set to a value matched with high accuracy and accuracy to such an impedance matching level.
Therefore, in an apparatus or system to which the present invention is applied, a high-power composite wave is generated with high stability and accuracy under load distribution of a plurality of signal sources, and the line used for delivery of such a composite wave High reliability is ensured by adapting flexibly to various forms of impedance matching fluctuations.

It is a figure which shows one Embodiment of this invention. It is an operation | movement time chart of this embodiment. It is a figure which shows the structural example of the transmission system provided with the conventional power control apparatus.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing an embodiment of the present invention.
In the figure, components having the same functions and configurations as those shown in FIG. 3 are given the same reference numerals, and descriptions thereof are omitted here.

The difference in configuration between this embodiment and the conventional example shown in FIG. 3 is as follows.
(1) Transmission units 10-1 and 10-2 are provided instead of the transmission units 30-1 and 30-2.
(2) The configuration of the transmission unit 10-1 is the same as the configuration of the transmission unit 30-1, except that an excitation control unit 11-1 is provided instead of the excitation control unit 31-1 shown in FIG. is there. The configuration of the transmission unit 10-2 is the same as the configuration of the transmission unit 10-1. Therefore, in the following, “2” instead of the suffix “1” is assigned to the code of the corresponding element. The description is omitted.

(3) In place of the surge protectors 44-1 and 44-2, surge protectors 20-1 and 20-2 (the configuration and functions are the same) are provided, and these surge protectors 20-1 and 20-2 are provided. And have dedicated input / output ports connected to each other.

FIG. 2 is an operation time chart of this embodiment.
The operation of this embodiment will be described below with reference to FIGS.
One of the surge protectors 20-1 and 20-2, for example, instructs the subordinate excitation control section 11-1 to specify the normal value Ls as the level L of the transmitted wave, and the transmitted wave. In a state in which transmission of the transmission is permitted (hereinafter referred to as “normal state”), based on a sequence similar to the conventional example, such a transmission wave level L and transmission permission / rejection are updated as follows. .

(1) If the number of short-circuits occurring at the base of the antenna is “3” or less in 15 seconds, the normal state is maintained (FIGS. 2 (1) and (2)).
(2) However, if such a short circuit occurs four times in 15 seconds (FIG. 2 (3)), the level L is set to a fifth value (= L / 5) (hereinafter referred to as “reduction force value Lr”). ("(2) in FIG. 2)".

(3) In this state where the level L is updated (hereinafter referred to as “reduced state”), if the number of short circuits is “3” or less in 15 seconds, the reduced state is maintained. (Fig. 2 (5)).
(4) However, if such a short circuit occurs four times in 15 seconds (FIG. 2 (6)), permission for transmission is withdrawn (FIG. 2 (7)). Therefore, the excitation control unit 11-1 stops the generation (output) of the transmission wave (FIG. 2 (8)). Hereinafter, a state where such generation (output) of the transmission wave is not performed is referred to as a “stop state”.

  On the other hand, the surge protector 20-2 appropriately discriminates between the transmission wave level L notified from the opposing surge protector 20-1 and the rejection of transmission of the transmission wave as described above. For example, the following processing is performed.

(1) When the level L of the identified transmission wave is the normal value Ls or the reduction value Lr and transmission (output) of the transmission wave is permitted, the current state is maintained and the surge protector 20-1 Is notified of the level of the current transmission wave and the permission / inhibition of transmission (output) of this transmission wave (FIG. 2 (9)).

(2) When it is identified that permission for transmission (output) of a transmission wave has been withdrawn, the following procedures (2a) to (2) are performed regardless of the latest level L of the transmission wave similarly identified. The permission of transmission (output) given to the excitation control unit 11-2 based on one of 2c) is withdrawn (FIG. 2 (10)).

(2a) Immediately shift to the “stop state” (FIG. 2 (11)).
(2b) Transition to the “deceleration state” (FIG. 2 (12)), thereby instructing the excitation control unit 11-2 with the reduction value Lr as the level of the transmission wave. Migrate to

(2c) After maintaining the “normal state” for 15 seconds (FIG. 2 (13)), the transition to the “decelerating state” causes the excitation control unit 11-2 to reduce the reduction value as the transmitted wave level. Lr is instructed (FIG. 2 (14)), and after a lapse of 15 seconds, the state shifts to the “stop state” (FIG. 2 (15)).

  In the above procedures (2b) and (2C), for 15 seconds, the surge protector 20-2 restores the “transmission permission given to the excitation controller 11-1” by the surge protector 20-1. In this case, the transition to the above-described subsequent sequence is canceled, and based on a predetermined procedure, the level L of the transmission wave and permission to transmit the transmission wave are given to the excitation control unit 11-2.

  That is, due to factors such as the level of the traveling wave in the power supply path from the output of the synthesis circuit 41 to the power supply point of the antenna being small, the impedance mismatch of the power supply path is caused by the surge protectors 20-1 and 20-2. Even if only one of the surge protectors 20-1 and 20-2 is detected in advance as a factor that should be shifted to the “stop state”, one of them is excessive with respect to the other. Without delay, the subordinate excitation control unit is shifted to the “stop state”, and the generation (output) of transmission waves by the excitation controls 11-1 and 11-2 is regulated with high accuracy.

  Therefore, according to the present embodiment, even if the antenna base is short-circuited or the impedance of the carbon gap is remarkably lowered frequently or over a long time, the excitation controller 11-1 in such a state. , 11-2 can avoid various troubles caused by continuing generation (output) of transmission waves with high accuracy.

In the present embodiment, the number of transmission units that are arranged in the previous stage of the synthesis circuit 41 and that individually generate transmission waves to be subjected to power synthesis is “2”.
However, the number of such transmission units is “3” or more if the above-described level L and transmission (output) refusal are handed over to each other among all surge protectors provided individually. It may be.

  Further, in the present embodiment, the power of the synthesized wave generated by the synthesizing unit 41, the modulation method and frequency arrangement applied to the generation of individual transmission waves included in the synthesized wave, and these transmission waves are formed. The configuration of the channels and the multiple access scheme applied to form these channels may be any.

  Further, in the present embodiment, the transmission power L that can be set before shifting to the stop state is not limited to the above-described Ls and Lr, but is set or changed based on any algorithm with a desired value and the number of stages. May be.

  Further, in the transmission system to which the present embodiment is applied, the start of transmission by the excitation control units 11-1 and 11-2 is the surge protectors 20-1 and 20-2 in any process such as start-up and maintenance. May be performed either manually or manually by the operator.

  Furthermore, in the transmission system to which the present embodiment is applied, the level L and transmission (output) that the surge protectors 20-1 and 20-2 give to the subordinate excitation control units 11-1 and 11-2 as described above. ) Is either displayed via a predetermined display means or converted into sound and output, and further transferred to the outside as data subject to predetermined information processing. The convenience of maintenance and operation by the operator may be improved.

  Further, in the present embodiment, the present invention is based on the load distribution of the transmission units 10-1 and 10-2 and the synthesis of transmission waves individually generated by these transmission units 10-1 and 10-2. It is applied to power supply to the aerial of broadcast waves with large transmission power.

  However, the present invention is not limited to such a broadcast wave, and can be applied to any communication system or transmission system as long as a transmission wave to be fed to an antenna is generated by power combining in a subsequent stage of a plurality of transmission units. Is possible.

  Furthermore, in this embodiment, directional couplers 42-1 and 42-2 individually provided for the transmission units 10-1 and 10-2 arranged in the previous stage of the synthesis circuit 41 are provided.

  However, the number N (≧ 2) of such directional couplers is smaller than the number P (≧ 3) of transmission units arranged in the preceding stage of the synthesis circuit 41, and a plurality of such P transmission units are included. Any directional coupler may be shared by the transmitters via a combiner or the like.

  In the present embodiment, surge protectors 20-1 and 20-2 are provided in the transmission units 10-1 and 10-2, respectively.

  However, the number n (≧ 2) of such surge protectors is smaller than the number P (≧ 3) of transmission units arranged in the preceding stage of the synthesis circuit 41, and a plurality of such P transmission units are not included. Any surge protector may be shared by the transmitter.

  Furthermore, in the present embodiment, when the number P of the transmission units is “3” or more, the level L is transmitted to the surge protector (hereinafter referred to as “specific surge protector”) corresponding to each transmission unit. The surge protector to which the rejection of (output) should be handed over may be a part of a surge protector other than the specific surge protector as long as the reduction of the effect achieved by the present invention is allowed.

In the present embodiment, the present invention is applied to the above-described unbalanced power supply for the antenna.
However, the present invention is not limited to such unbalanced power supply, and can be similarly applied to power supply to a balanced power supply type antenna.

  Furthermore, in the present embodiment, transmissions to be individually generated by the excitation control units 11-1 and 11-2 according to the degree of impedance matching of the feeding path that feeds the combined wave generated by the combining circuit 41 to the antenna. The wave level and rejection of transmission (output) of the transmission wave are set.

  However, the present invention is not limited to such a power feeding path, and the level of these wave signals is set according to the degree of impedance matching of the transmission path used for transmitting the wave signals generated by power combining. The present invention can be similarly applied to various devices and systems.

  Further, the present invention is not limited to the above-described embodiments, and various configurations of the embodiments are possible within the scope of the present invention, and any improvements may be made to all or some of the components.

DESCRIPTION OF SYMBOLS 10,30 Transmission part 11,31 Excitation control part 20,44 Surge protector 32 Power amplification part 33 Band pass filter (BPF)
41 Combining circuit 42 Directional coupler 43, 46 T-type circuit 45 Current transformer (CT)
47 Feeding path 48 Carbon gap 49 Ammeter

Claims (1)

The wave signal to be generated by any one of the plurality of signal sources is set to a value Lev that is suitable for the degree of impedance matching of the line used for delivery of the composite wave of the wave signals generated by the plurality of signal sources. A power control device for setting power,
Monitoring means for monitoring power set individually by all or part of the plurality of signal sources other than the one signal source;
A power control apparatus comprising: another system linking means for setting the value Lev to a value Lopt that matches a combination of power monitored by the monitoring means.