JPS6066166A - Reflected wave power detecting circuit - Google Patents
Reflected wave power detecting circuitInfo
- Publication number
- JPS6066166A JPS6066166A JP58174146A JP17414683A JPS6066166A JP S6066166 A JPS6066166 A JP S6066166A JP 58174146 A JP58174146 A JP 58174146A JP 17414683 A JP17414683 A JP 17414683A JP S6066166 A JPS6066166 A JP S6066166A
- Authority
- JP
- Japan
- Prior art keywords
- wave power
- reflected wave
- output
- power
- detection circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Amplifiers (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は電力増巾器の増巾素子を負荷変動から保膜する
だめの反射波電力検出回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a reflected wave power detection circuit for protecting an amplifying element of a power amplifier from load fluctuations.
近年、全固定化電力増巾器は高出力化が進み、VHF帯
ではIKWを越えるユニットが実用化されてhる。さら
に小形化、省電力化を図った高能率の電力増巾器として
は、サーキュレータ等を使用せず増巾素子の効率を上げ
ると共に、出力回路損失を出来るだけ少くしたものも使
用されるようになってきている。ところが、このサーキ
ュレータを使用しない電力増巾器は、負荷変動によシ生
じる反射波−力のために増巾素子が破壊されることがあ
り、これを防止するため、反射波電力を検出して電力増
巾器の入力信号レベルを下げたり、つた。In recent years, the output of fully fixed power amplifiers has been increasing, and units exceeding IKW have been put into practical use in the VHF band. In addition, high-efficiency power amplifiers that are more compact and power-saving are being used that do not use circulators to increase the efficiency of the amplifier element and reduce output circuit loss as much as possible. It has become to. However, in power amplifiers that do not use this circulator, the amplifier element may be destroyed by the reflected wave power caused by load fluctuations, and to prevent this, the reflected wave power is detected. Lower the input signal level of the power amplifier.
従来より上記保胎手段として…いられてきた反射波゛電
力検出回路としては、例えば第1図の如きものがある。An example of a reflected wave/power detection circuit that has been used as the above-mentioned preservation means is as shown in FIG. 1, for example.
′市力増巾器ii、t、増巾部2と出力端子13間に方
向性結合器3を設けると共に検出回路20及び制御部3
oを備えたものである。そしてこの方向性結合器3の反
射波1に力検出端子13から反射波’17L力を取り出
して検波器により検波された電圧により制御している。' Municipal power amplifiers ii and t, a directional coupler 3 is provided between the amplifier section 2 and the output terminal 13, and a detection circuit 20 and a control section 3 are provided.
o. Then, the reflected wave '17L force is taken out from the force detection terminal 13 as the reflected wave 1 of the directional coupler 3, and is controlled by the voltage detected by the wave detector.
しかしながらこの制詞胤圧は′電力増巾器1の出力端子
13卆ら空中線までの間に生じるインピーダンスの不拮
合部分の場所により変動するもので、例えば′1i、力
増「わ器1の出力端子13から不整合部分までの距離に
より第2図に示す如く、電力がPl からP2までの間
で変化する。そのため反射電力の検出が不正確になり、
制御部3oの誤動作をまねくという欠点があった。However, this prescriptive pressure varies depending on the location of the impedance mismatch that occurs between the output terminal 13 of the power multiplier 1 and the antenna. As shown in Figure 2, the power changes between Pl and P2 depending on the distance from the output terminal 13 to the mismatched part.As a result, the detection of reflected power becomes inaccurate.
This has the drawback of causing malfunction of the control section 3o.
本発明は、このような従来の欠点を改冒し、不整合部分
の位置が変化しても常に一定である進行波と反射波の比
を検出する反射波電力検出回路を提供せんとするもので
ある。そして具体的には、電力増中部の出力ラインに結
合され、進行波電力検出端子と反射波電力検出端子を有
する方向性結合器と、該方向性結合器の反射波電力検出
端子からの高周波信号を受け、反射波電力に対応した直
流分を検出する第一検出回路と、前記方向性結合器の進
行波検出端子の高周波信号を受け、その高周波信号を規
定の配分に二分配する分配器と、該分配器の一方の出力
を受け、その高周波信号を規定のレベルに調整するレベ
ル調整器と、該レベル調整器の出力を受け、その出力電
力に対応した直流分を検出する第二検出回路と、前記第
一、第二検出回路の出力を受ける差動増巾器と前記分配
器の他方の出力を受け、規定のレベルを検出する第三検
出回路と、そして該第三検出回路よりの信号を検知した
場合のみ前記差動増巾器の出力信号により制御される制
御部とを備えて成る反射波電力検出回路を提供せんとす
るものである。The present invention aims to overcome these conventional drawbacks and provide a reflected wave power detection circuit that detects the ratio of the traveling wave to the reflected wave that is always constant even if the position of the mismatched portion changes. be. Specifically, it includes a directional coupler that is coupled to the output line of the power multiplier and has a traveling wave power detection terminal and a reflected wave power detection terminal, and a high frequency signal from the reflected wave power detection terminal of the directional coupler. a first detection circuit that detects a direct current component corresponding to the reflected wave power; and a distributor that receives a high frequency signal from the traveling wave detection terminal of the directional coupler and divides the high frequency signal into two prescribed distributions. , a level adjuster that receives the output of one of the dividers and adjusts the high-frequency signal to a specified level; and a second detection circuit that receives the output of the level adjuster and detects a DC component corresponding to the output power. and a differential amplifier receiving the outputs of the first and second detection circuits, and a third detection circuit receiving the output of the other of the distributors and detecting a prescribed level; It is an object of the present invention to provide a reflected wave power detection circuit comprising a control section that is controlled by the output signal of the differential amplifier only when a signal is detected.
以下本発明を第3図に示す一実施例に基づいて説明する
。尚、以下では従来と共通の部分については共通の符号
を付し、乗捨する説明は省略する。The present invention will be explained below based on an embodiment shown in FIG. Note that, in the following, parts common to those in the prior art will be given the same reference numerals, and explanations of multiplying and dropping will be omitted.
図中20は方向性結合器、21は分配器、22は反射波
電力に対応する直流分を検出する第一検出回路、23は
進行波電力を17ベル調整するレベル調整器、24は前
記レベル調整器23の出方電力に対応した直流分を検出
する第二検出回路、25は進行波電力が規定のレベルが
どうかを検出する第三検出回路、26は差動増巾器、2
7は制御部、である。そして28は、方向性結合器の反
射電力検出端子、29は前記方向性結合器2oの進行波
電力検出端子を示している。In the figure, 20 is a directional coupler, 21 is a distributor, 22 is a first detection circuit that detects the DC component corresponding to the reflected wave power, 23 is a level adjuster that adjusts the traveling wave power by 17 levels, and 24 is the level a second detection circuit that detects a DC component corresponding to the output power of the regulator 23; 25, a third detection circuit that detects whether the traveling wave power is at a specified level; 26, a differential amplifier;
7 is a control section. Reference numeral 28 indicates a reflected power detection terminal of the directional coupler, and 29 indicates a traveling wave power detection terminal of the directional coupler 2o.
ここで方向性結合器2oの反射波電力検出端子28より
の高周波信号は反射波電力に対応した直流分を出力する
第一検出回路22を介して差動増巾器26の一方の大刀
端子に加わる。また方向性結合器20の進行波電力検出
端子29よりの高周波信号は分配器21によυ規定の配
分に分配され、その一方の信号は電力増巾器lの増ij
素子が破壊しない反射波電力に相当するVSWR(電圧
定在波比、以下略)になるよう、レベル調整器23によ
り調整される。Here, the high frequency signal from the reflected wave power detection terminal 28 of the directional coupler 2o is sent to one of the long sword terminals of the differential amplifier 26 via the first detection circuit 22 which outputs a DC component corresponding to the reflected wave power. join. In addition, the high frequency signal from the traveling wave power detection terminal 29 of the directional coupler 20 is distributed by the distributor 21 into υ prescribed distributions, and one of the signals is distributed to the power amplifier 1 by the power amplifier l.
The level adjuster 23 adjusts the voltage so that the VSWR (voltage standing wave ratio, hereinafter abbreviated) corresponds to the reflected wave power that does not destroy the element.
この調整された高周波信号は、該信号の示す電力に対応
した出力を検出する第二検出回路24を介して差動増巾
器26の他方の大刀端子に加えられる。すると、差動増
巾器26の出力は進行波電力と反射波電力の比すなわち
負荷のVSWRに対応するものとなり、この出方信号は
制御部27へ送出される。This adjusted high frequency signal is applied to the other long terminal of the differential amplifier 26 via the second detection circuit 24 which detects the output corresponding to the power indicated by the signal. Then, the output of the differential amplifier 26 corresponds to the ratio of the traveling wave power to the reflected wave power, that is, the VSWR of the load, and this output signal is sent to the control section 27.
ところで電力増巾器1を並列に使用する場合等にはしば
しば電力増巾器1の立上シのバラツキ等により、一つの
電力増巾器が立上る前に他の電力増巾器が出力し、その
信号が合成器を通して廻り込むことにより、自分自身の
進行波が0で、出力端子からの信号が入り、VSWRが
無限大で差動増巾器26が出力する。そのため、分配器
21よりの他方の進行波電力が規定レベル(進行波電力
か全反射しても増巾部2の増巾素子か破壊しないレベル
)かどうか検出する第三検出回路25を介して、制御部
27へ送出し、規定の進行波電力がある場合のみ、制御
部27は差動増1〕器26からの信号にて制御が行なわ
れる。By the way, when power amplifiers 1 are used in parallel, it is often the case that due to variations in the start-up of the power amplifiers 1, before one power amplifier starts up, another power amplifier outputs an output. , the signal goes around through the combiner, so that the signal from the output terminal enters with its own traveling wave being 0, and the differential amplifier 26 outputs the signal with infinite VSWR. Therefore, the power of the other traveling wave from the distributor 21 is at a specified level (a level that does not destroy the amplifying element of the amplifying section 2 even if the traveling wave power is totally reflected). , to the control unit 27, and only when there is a specified traveling wave power, the control unit 27 is controlled by the signal from the differential amplifier 26.
本発明に係る反射波電力検出回路は、以上説明してきた
如きものなので、不整合部分の場所によって反射波電力
が変化する等の誤差がなく、正確な検知が出来、高信頼
性化に多大な効果が得られる。Since the reflected wave power detection circuit according to the present invention is as described above, there is no error such as changes in the reflected wave power depending on the location of the mismatched part, and accurate detection is possible, which greatly contributes to high reliability. Effects can be obtained.
第1図は従来の反射波電力検出回路を使用した重力増l
〕器のブロック図、
館2図は反射点の距離をかえることによる方向性結合器
の反射波電力検出端子の出力電力の変化を示す特性図、
そして
鎮3図は本発明の一実施例を含む重力増巾器のブロック
図である。
1・・・′重力増巾器 2・・・増巾部12・・・出力
ライン 20・・・方向性結合器21・・・分配器 2
2・・・腑−検出回路23・・・“レベル調整器 24
・・・第二検出回路25・・・第三検出回路 26・・
・差動増1j器27・・・制御部 28・・・反射波電
力検出端子29・・・進行波電力検出端子
出願人 日本電気株式会社Figure 1 shows gravity increase using a conventional reflected wave power detection circuit.
] block diagram of the device, Figure 2 is a characteristic diagram showing the change in the output power of the reflected wave power detection terminal of the directional coupler by changing the distance of the reflection point,
Figure 3 is a block diagram of a gravity amplifier including an embodiment of the present invention. 1...' Gravity amplifier 2... Amplifying section 12... Output line 20... Directional coupler 21... Distributor 2
2...Sense-detection circuit 23..."Level adjuster 24
...Second detection circuit 25...Third detection circuit 26...
・Differential multiplier 1j 27...control unit 28...reflected wave power detection terminal 29...travelling wave power detection terminal Applicant: NEC Corporation
Claims (1)
増[1]器の出力ラインに結合した方向性結合器と、該
方向性結合器の反射波電力検出端子からの高周波信号を
受け、反射波電力に対応する直流分を検出する第一検出
回路と、前記方向性結合器の進行波検出端子からの高周
波信号を受け、その高周波信号を規定の配分に二分配す
る分配器と、前記分配器の一方の出力を受け、その高周
波信号を規定のレベルに調整するレベル調整器と、前記
レベル調整器の出力を受け、その出力電力に対応する直
流分を検出する第二検出回路と、前記第一。 第二検出回路の出力を受ける差動増巾器と、前記分配器
の他方の出力を受け規定のレベルを検出す信号を検知し
た場合のみ前記差動増巾器の出力信4i4iK、より制
御される制御部とを備えて成る反射波電力検出回路。[Claims] A directional coupler having a traveling wave power detection terminal and a reflected wave power output terminal and coupled to an output line of a power increaser [1], and reflected wave power detection of the directional coupler. a first detection circuit that receives a high frequency signal from the terminal and detects a DC component corresponding to the reflected wave power; and a first detection circuit that receives a high frequency signal from the traveling wave detection terminal of the directional coupler and distributes the high frequency signal in a prescribed manner. a divider that divides into two; a level adjuster that receives the output of one of the dividers and adjusts the high frequency signal to a specified level; and a level adjuster that receives the output of the level adjuster and adjusts the DC component corresponding to the output power. a second detection circuit for detecting; and said first detection circuit. A differential amplifier receives the output of the second detection circuit, and an output signal 4i4iK of the differential amplifier receives the output of the other of the distributors and is controlled by the output signal 4i4iK only when a signal that detects a specified level is detected. A reflected wave power detection circuit comprising a control section.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58174146A JPS6066166A (en) | 1983-09-22 | 1983-09-22 | Reflected wave power detecting circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58174146A JPS6066166A (en) | 1983-09-22 | 1983-09-22 | Reflected wave power detecting circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6066166A true JPS6066166A (en) | 1985-04-16 |
JPH0374526B2 JPH0374526B2 (en) | 1991-11-27 |
Family
ID=15973473
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58174146A Granted JPS6066166A (en) | 1983-09-22 | 1983-09-22 | Reflected wave power detecting circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6066166A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03128320U (en) * | 1990-04-04 | 1991-12-24 | ||
CN110632533A (en) * | 2019-08-08 | 2019-12-31 | 苏州博维仪器科技有限公司 | Power detection system of RF (radio frequency) power supply |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57174910A (en) * | 1981-04-20 | 1982-10-27 | Oki Electric Ind Co Ltd | Overload protecting system for high frequency power amplifier |
JPS5899941U (en) * | 1981-12-25 | 1983-07-07 | 三菱電機株式会社 | transmitter |
-
1983
- 1983-09-22 JP JP58174146A patent/JPS6066166A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57174910A (en) * | 1981-04-20 | 1982-10-27 | Oki Electric Ind Co Ltd | Overload protecting system for high frequency power amplifier |
JPS5899941U (en) * | 1981-12-25 | 1983-07-07 | 三菱電機株式会社 | transmitter |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03128320U (en) * | 1990-04-04 | 1991-12-24 | ||
CN110632533A (en) * | 2019-08-08 | 2019-12-31 | 苏州博维仪器科技有限公司 | Power detection system of RF (radio frequency) power supply |
CN110632533B (en) * | 2019-08-08 | 2022-09-27 | 苏州博维仪器科技有限公司 | Power detection system of RF (radio frequency) power supply |
Also Published As
Publication number | Publication date |
---|---|
JPH0374526B2 (en) | 1991-11-27 |
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