JPH0114548B2 - - Google Patents
Info
- Publication number
- JPH0114548B2 JPH0114548B2 JP59001002A JP100284A JPH0114548B2 JP H0114548 B2 JPH0114548 B2 JP H0114548B2 JP 59001002 A JP59001002 A JP 59001002A JP 100284 A JP100284 A JP 100284A JP H0114548 B2 JPH0114548 B2 JP H0114548B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- pull circuit
- emitting diode
- power supply
- light emitting
- 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
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Emergency Protection Circuit Devices (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、シングル・エンデツド・プツシユプ
ル回路を用いた音声出力回路において出力端子が
短絡されたときにこれを検知し表示する装置に関
する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for detecting and displaying short-circuited output terminals in an audio output circuit using a single-ended push-pull circuit.
従来例の構成とその問題点
シングル・エンデツド・プツシユプル回路の出
力端子に結合コンデンサを介してスピーカを接続
した音声回路において、結合コンデンサとスピー
カとの接続点が、回路点検時等にアースに短絡し
た場合、シングル・エンデツド・ブツシユプル回
路を構成するトランジスタに過電流が流れ、これ
がかなりの時間流れるとトランジスタが破壊する
ことがある。Conventional configuration and its problems In an audio circuit where a speaker is connected to the output terminal of a single-ended push-pull circuit via a coupling capacitor, the connection point between the coupling capacitor and the speaker may be shorted to ground during circuit inspection, etc. In this case, excessive current flows through the transistors that make up the single-ended bush-pull circuit, and if this continues for a considerable period of time, the transistors may be destroyed.
発明の目的
本発明は、シングル・エンデツド・プツシユプ
ル回路を用いた音声出力回路において、出力端子
がアースに短絡した場合に、これを検知し表示し
て電源の切断等を促し、シングル・エンデツド・
プツシユプル回路を構成するトランジスタが過電
流や発熱によつて破壊するのを防止しようとする
ものである。Purpose of the Invention The present invention provides an audio output circuit using a single-ended push-pull circuit, in which when an output terminal is short-circuited to ground, this is detected and displayed to prompt the user to turn off the power.
This is intended to prevent the transistors that make up the push-pull circuit from being destroyed due to overcurrent or heat generation.
発明の構成
本発明においては、シングル・エンデツド・プ
ツシユプル回路の出力端子に結合コンデンサを介
してスピーカを接続し、このシングル・エンデツ
ド・プツシユプル回路の電源側端子と直流電源端
子との間に抵抗と発光ダイオードとの並列回路と
を接続して、出力端子が短絡したときにこの発光
ダイオードを点灯させるようにしている。Structure of the Invention In the present invention, a speaker is connected to the output terminal of a single-ended push-pull circuit via a coupling capacitor, and a resistor is connected between the power supply side terminal of this single-ended push-pull circuit and a DC power supply terminal. A parallel circuit with a diode is connected to light up the light emitting diode when the output terminal is short-circuited.
実施例の説明
以下、本発明の一実施例についてて図面を参照
して説明する。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
図に示すようにトランジスタ１，２を主体とし
てシングル・エンデツド・プツシユプル回路を構
成し、この出力端子３を結合コンデンサ４を介し
てスピーカ５に接続して音声出力回路を構成す
る。トランジスタ１の電源側端子６を発光ダイオ
ード７と電源制限抵抗８との直列回路と抵抗９と
の並列回路を介して直流電源端子１０に接続す
る。 As shown in the figure, a single-ended push-pull circuit is constructed mainly of transistors 1 and 2, and this output terminal 3 is connected to a speaker 5 via a coupling capacitor 4 to construct an audio output circuit. A power supply side terminal 6 of the transistor 1 is connected to a DC power supply terminal 10 via a series circuit of a light emitting diode 7 and a power supply limiting resistor 8 and a parallel circuit of a resistor 9.
通状の動作状態においては抵抗９における電圧
降下は約2.0ボルト以下になるように設定され、
発光ダイオード７は発光しない。コンデンサ４と
スピーカ５との接続点がアースに接続されるとト
ランジスタ１，２に過電流が流れるが抵抗９の電
流も増加し、降下電圧が増加する。この結果、そ
の降下電圧が2.0ボルトを越えて発光ダイオード
７の順方向電圧を越えると発光ダイオード７は発
光し過電流状態を表示する。 Under normal operating conditions, the voltage drop across resistor 9 is set to be approximately 2.0 volts or less;
The light emitting diode 7 does not emit light. When the connection point between the capacitor 4 and the speaker 5 is connected to ground, an overcurrent flows through the transistors 1 and 2, but the current through the resistor 9 also increases, and the voltage drop increases. As a result, when the voltage drop exceeds 2.0 volts and exceeds the forward voltage of the light emitting diode 7, the light emitting diode 7 emits light to indicate an overcurrent condition.
発明の効果
以上のように本発明によれば、トランジスタに
過電流が流れると発光ダイオードが点灯してこれ
を知らせることができるので、使用者はこの表示
を見て直ちに電源を切断する等の処置を講じるこ
とができ、トランジスタの破壊を防止することが
できるものである。Effects of the Invention As described above, according to the present invention, when an overcurrent flows through a transistor, a light emitting diode lights up to notify the user of this, so that the user can immediately take measures such as turning off the power after seeing this display. Therefore, the transistor can be prevented from being destroyed.
図は本発明の一実施例における音声出力端子短
絡検知装置の回路図である。
１，２……シングル・エンデツド・プツシユプ
ル回路用トランジスタ、３……出力端子、４……
結合コンデンサ、５……スピーカ、６……電源側
端子、７……発光ダイオード、９……抵抗、１０
……直流電源端子。
The figure is a circuit diagram of an audio output terminal short-circuit detection device according to an embodiment of the present invention. 1, 2...Single-ended push-pull circuit transistor, 3...Output terminal, 4...
Coupling capacitor, 5... Speaker, 6... Power supply side terminal, 7... Light emitting diode, 9... Resistor, 10
...DC power supply terminal.
Claims (1)
出力端子に結合コンデンサを介してスピーカを接
続し、上記シングル・エンデツド・プツシユプル
回路の電源側端子と直流電源端子との間に過電流
検出用抵抗を接続し、この抵抗に並列に発光ダイ
オードを接続するとともに、上記過電流検出用抵
抗の抵抗値は、上記結合コンデンサとシングル・
エンデツド・プツシユプル回路の接続点がアース
短絡されたときに発光ダイオードが発光するよう
に設定されたことを特徴とする音声出力端子短絡
検知装置。1 Connect a speaker to the output terminal of the single-ended push-pull circuit via a coupling capacitor, connect an overcurrent detection resistor between the power supply terminal of the single-ended push-pull circuit and the DC power supply terminal, and A light emitting diode is connected in parallel to the resistor, and the resistance value of the overcurrent detection resistor is set to be the same as that of the coupling capacitor.
An audio output terminal short-circuit detection device characterized in that a light emitting diode is set to emit light when a connection point of an end push-pull circuit is short-circuited to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59001002A JPS59135376A (en) | 1984-01-06 | 1984-01-06 | Audio output terminal short circuit detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59001002A JPS59135376A (en) | 1984-01-06 | 1984-01-06 | Audio output terminal short circuit detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59135376A JPS59135376A (en) | 1984-08-03 |
| JPH0114548B2 true JPH0114548B2 (en) | 1989-03-13 |
Family
ID=11489373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59001002A Granted JPS59135376A (en) | 1984-01-06 | 1984-01-06 | Audio output terminal short circuit detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59135376A (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS537674U (en) * | 1976-07-06 | 1978-01-23 |
-
1984
- 1984-01-06 JP JP59001002A patent/JPS59135376A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59135376A (en) | 1984-08-03 |
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