JPS6230277Y2 - - Google Patents
Info
- Publication number
- JPS6230277Y2 JPS6230277Y2 JP14749478U JP14749478U JPS6230277Y2 JP S6230277 Y2 JPS6230277 Y2 JP S6230277Y2 JP 14749478 U JP14749478 U JP 14749478U JP 14749478 U JP14749478 U JP 14749478U JP S6230277 Y2 JPS6230277 Y2 JP S6230277Y2
- Authority
- JP
- Japan
- Prior art keywords
- fuse
- circuit
- input
- frequency
- closed 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.)
- Expired
Links
- 238000001514 detection method Methods 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Fuses (AREA)
Description
【考案の詳細な説明】
この考案は例えば無線機のような高周波電力の
大きな機器に対する測定器、カウンタ、スペクト
ルアナライザ等において大きな高周波が入力され
て焼損を起すのを保護するように設けれた保護ヒ
ユーズの溶断を検出する回路に関する。[Detailed description of the invention] This invention is designed to protect measuring instruments, counters, spectrum analyzers, etc. for devices that use large amounts of high-frequency power, such as radio equipment, from being burnt out due to input of large high-frequency waves. The present invention relates to a circuit for detecting fuse blowout.
例えば無線機の出力を測定する場合において減
衰器が故障し、大きな高周波入力が測定器に入力
されてその測定器が損傷することがある。従つて
このような測定器の入力回路に大きな高周波が入
力されると溶断するヒユーズを設けて、測定器を
保護することが行なわれている。 For example, when measuring the output of a radio, an attenuator may fail and a large high frequency input may be input to the measuring instrument, damaging the measuring instrument. Therefore, in order to protect the measuring instrument, a fuse is provided that blows when a large high frequency is input to the input circuit of such a measuring instrument.
しかしながらこの高周波の測定器においてはヒ
ユーズが溶断しても浮遊容量等によつて信号が完
全に遮断されないため、叉装置自体は不良になる
ものではなく正しく動作するため、測定器は動作
する。従つて普通の電源ヒユーズの場合はヒユー
ズが溶断すると、それにより電源が供給されてい
る装置全体が動作しなくなるため、ヒユーズが溶
断したことを容易に判定することができる。しか
も高周波大入力を保護するためのヒユーズにおい
てはそれが溶断しても、その装置の動作状態で知
ることはできない。 However, in this high-frequency measuring instrument, even if the fuse blows, the signal is not completely cut off due to stray capacitance, so the instrument itself does not become defective and operates correctly, so the measuring instrument continues to operate. Therefore, in the case of a normal power supply fuse, if the fuse blows, the entire device to which power is supplied will stop operating, so it can be easily determined that the fuse has blown. Furthermore, even if a fuse for protecting high-frequency large inputs blows, it cannot be known from the operating state of the device.
また高周波の通路にヒユーズが挿入されるため
その保護ヒユーズを外部から容易に見えるような
状態に引出して接続するとそのためのリード線が
長くなつて高周波通路の特性が劣化し好ましくな
い。このような実装上の制限からヒユーズは装置
の内部に挿入されて外部から簡単にその溶断状態
を見ることは困難である。 Further, since a fuse is inserted into the high frequency path, if the protective fuse is pulled out and connected in a state where it can be easily seen from the outside, the lead wire for this will become long and the characteristics of the high frequency path will deteriorate, which is undesirable. Due to such mounting restrictions, it is difficult to easily see the blown state of the fuse from the outside since the fuse is inserted inside the device.
この考案はこのような点から高周波大入力に対
し保護するためのヒユーズが溶断した状態を検出
する回路を提案するものである。 From this point of view, this invention proposes a circuit that detects a blown state of a fuse for protection against large high-frequency inputs.
この考案によれば大きな高周波が入力されるの
を保護するヒユーズを含む直流の監視電流閉回路
を構成し、ヒユーズが溶断すると、その直流閉回
路が遮断されて、これを検出回路により検出し、
その検出出力によつて表示器を表示させるように
する。 According to this invention, a DC monitoring current closed circuit including a fuse that protects against input of large high frequencies is constructed, and when the fuse blows, the DC closed circuit is interrupted and this is detected by a detection circuit.
The detection output is displayed on the display.
例えば図に示すように測定器、カウンタ、スペ
クトルアナライザ等に高周波が入力されるが、大
きな高周波が入力されるのを保護されるべき回路
１１の入力端子１２と装置として入力端子１３と
の間に直列に保護ヒユーズ１４が挿入される。 For example, as shown in the figure, high frequencies are input to measuring instruments, counters, spectrum analyzers, etc., but between the input terminal 12 of a circuit 11 that should be protected from inputting large high frequencies and the input terminal 13 of the device. A protective fuse 14 is inserted in series.
この考案において保護ヒユーズ１４を含んで直
流の監視電流閉回路を構成する。即ちヒユーズ１
４の一端は抵抗器１５を通じて接地され、他端は
抵抗器１６を通じ、更に抵抗器１７を通じて直流
電源１８に接続される。直流電源１８の他端は接
地される。抵抗器１５、ヒユーズ１４、抵抗器１
６，１７、電源１８による直流閉回路１９の直流
が回路１１が外部の高周波通路に流れるのを遮断
するためのヒユーズ１４と抵抗器１５，１６との
接続点はそれぞれ直流遮断コンデンサ２１，２２
を通じて端子１２及び１３に接続される。 In this invention, a DC monitoring current closed circuit including the protective fuse 14 is constructed. That is fuse 1
One end of 4 is grounded through a resistor 15, and the other end is connected to a DC power source 18 through a resistor 16 and further through a resistor 17. The other end of the DC power supply 18 is grounded. Resistor 15, fuse 14, resistor 1
6, 17, the connection point between the fuse 14 and the resistors 15, 16 for blocking the direct current of the DC closed circuit 19 from the power supply 18 from flowing into the high frequency path outside the circuit 11 is connected to the DC blocking capacitors 21, 22, respectively.
It is connected to terminals 12 and 13 through.
この直流閉回路１９が開回路状態となると、つ
まりヒユーズ１４が溶断するとこれを検出する検
出回路が設けられる。例えば抵抗器１６及び１７
の接続点はトランジスタ２３のベースに接続さ
れ、トランジスタ２３のエミツタは接地され、コ
レクタは発光ダイオード２４を通じて電源端子２
５に接続される。 A detection circuit is provided to detect when the DC closed circuit 19 becomes open, that is, when the fuse 14 blows out. For example resistors 16 and 17
The connection point of is connected to the base of the transistor 23, the emitter of the transistor 23 is grounded, and the collector is connected to the power supply terminal 2 through the light emitting diode 24.
Connected to 5.
抵抗器１５，１６，１７の各抵抗値をR1，
R2，R3とし、電源１８の電圧をVaとすると、抵
抗器１６，１７の接続点の電圧は
Va＝−Ｖａ×Ｒ３／Ｒ１＋Ｒ２＋Ｒ３
となつている。この電圧によつてはトランジスタ
２３は不導通となるように各値が選ばれる。しか
しヒユーズ１４が溶断するとトランジスタ２３の
ベース電圧がVaとなり、これによつてトランジ
スタ２３が導通し、発光ダイオード２４が発光
し、ヒユーズ１４が溶断したことを表示される。 The resistance values of resistors 15, 16, and 17 are R 1 ,
R 2 and R 3 and the voltage of the power supply 18 is Va, the voltage at the connection point of the resistors 16 and 17 is Va=-Va×R 3 /R 1 +R 2 +R 3 . Each value is selected so that the transistor 23 becomes non-conductive depending on this voltage. However, when the fuse 14 blows, the base voltage of the transistor 23 becomes Va, which makes the transistor 23 conductive and causes the light emitting diode 24 to emit light, indicating that the fuse 14 has blown.
尚この高周波回路の入出力インビーダンス、即
ち端子１３側から外部を見たインビーダンス及び
端子１２より保護されるべき回路１１を見たイン
ビーダンスが例えば５０Ωであり、抵抗器１５，
１６の抵抗値はこれに対して十分大きいように選
ばれて、閉回路１９を接続したことによつて影響
を受けないようにされる。 The input/output impedance of this high frequency circuit, that is, the impedance viewed from the terminal 13 side and the impedance viewed from the terminal 12 to the circuit 11 to be protected, is, for example, 50Ω, and the resistors 15,
The resistance value of 16 is chosen to be sufficiently large for this purpose so that it is not affected by the connection of closed circuit 19.
以上述べたよううにこの考案によるヒユーズ溶
断検出回路によれば、大入力の高周波に対してヒ
ユーズ１４が溶断されると発光ダイオード２４が
発光してヒユーズが溶断したことが表示される。
従つて例えば高周波の入力を回路１１によつて計
数している場合、瞬時的に大入力が入力されてヒ
ユーズ１４が溶断した場合でも、その浮遊容量に
よつて高周波が回路１１に入力される場合はその
まま計数動作を継続することになる。しかしヒユ
ーズ１４が溶断した状態で計数する場合は動作が
不安定となり、正しい測定が行なわれない。回路
１１がカウンタでない他の測定器においても一般
には同様に正しい測定とならない。 As described above, according to the fuse blowout detection circuit according to this invention, when the fuse 14 blows due to a high frequency input, the light emitting diode 24 emits light to indicate that the fuse has blown.
Therefore, for example, when a high frequency input is being counted by the circuit 11, even if a large input is momentarily input and the fuse 14 blows, the high frequency may be input to the circuit 11 due to its stray capacitance. will continue counting operation. However, if counting is performed with the fuse 14 blown, the operation will become unstable and correct measurements will not be made. Other measuring instruments in which the circuit 11 is not a counter generally do not provide accurate measurements as well.
従来においてはそのような状態を知らないでそ
のまゝ測定されるおそれがあつたが、この考案の
検出回路を用いれば、ヒユーズの溶断が表示され
るため前記のようなおそれはない。叉ヒユーズ１
４を外部から見えるように引き出ることもなく高
周波通路にヒユーズを挿入して大きな影響を与え
ることがない。 In the past, there was a risk that the measurement would be made without knowing such a state, but if the detection circuit of this invention is used, the blown fuse is displayed, so there is no such risk. Cross fuse 1
4 is not drawn out so as to be visible from the outside, and a fuse is not inserted into the high frequency path and does not have a large effect.
発光ダイオード２４は外部の見易い位置に設け
ても直流信号で動作するものであるから実装上の
制限を受け難い。尚直流閉回路１９には高周波を
遮断する、つまり高周波が接地側に落ちるのを阻
止するような阻止コイルを挿入しても良い。叉表
示器は発光ダイオードに限る必要はなく、叉検出
としてもトランジスタ２３のみならず他の素子を
使用して構成してもよい。 Even if the light emitting diode 24 is provided in an easily visible position outside, it is not subject to mounting restrictions because it operates with a DC signal. Note that a blocking coil may be inserted into the DC closed circuit 19 to block high frequencies, that is, to prevent high frequencies from falling to the ground side. The display device is not limited to a light emitting diode, and the detection device may be configured using not only the transistor 23 but also other elements.
図はこの考案によるヒユーズ溶断検出回路の一
例を示す接続図である。
１１：保護されるべき回路、１２，１３：入力
端子、１４：ヒユーズ、１９：直流監視電流閉回
路。
The figure is a connection diagram showing an example of a fuse blowout detection circuit according to this invention. 11: Circuit to be protected, 12, 13: Input terminal, 14: Fuse, 19: DC monitoring current closed circuit.
Claims (1)
れるべき高周波回路の入力回路に保護ヒユーズが
挿入された保護装置において、 上記保護ヒユーズと高周波回路との間及び上記
保護ヒユーズと入力端子との間にそれぞれ直流遮
断コンデンサが挿入され、 これらの直流遮断コンデンサにより、上記入力
端子及び上記高周波回路と直流的に遮断されて、
上記保護ヒユーズを含む直流の監視電流閉回路が
構成され、その閉回路における直流通路が遮断状
態となるのを検出する検出回路が上記閉回路に接
続され、 その検出回路の出力を表示する表示器が設けら
れてなる高周波大入力保護ヒユーズ溶断検出回
路。[Claims for Utility Model Registration] In a protection device in which a protective fuse is inserted into the input circuit of a high-frequency circuit that is to be protected from being blown out by a large high-frequency input, between the protective fuse and the high-frequency circuit, and between the protective fuse and the high-frequency circuit. A DC cutoff capacitor is inserted between each input terminal, and these DC cutoff capacitors cut off the input terminal and the high frequency circuit in terms of direct current.
A DC monitoring current closed circuit including the above-mentioned protective fuse is configured, a detection circuit for detecting that the DC path in the closed circuit is cut off is connected to the above-mentioned closed circuit, and an indicator that displays the output of the detection circuit. A high frequency large input protection fuse blowout detection circuit is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14749478U JPS6230277Y2 (en) | 1978-10-25 | 1978-10-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14749478U JPS6230277Y2 (en) | 1978-10-25 | 1978-10-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5563054U JPS5563054U (en) | 1980-04-30 |
| JPS6230277Y2 true JPS6230277Y2 (en) | 1987-08-04 |
Family
ID=29129001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14749478U Expired JPS6230277Y2 (en) | 1978-10-25 | 1978-10-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6230277Y2 (en) |
-
1978
- 1978-10-25 JP JP14749478U patent/JPS6230277Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5563054U (en) | 1980-04-30 |
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