JP2917323B2 - Alarm output circuit of communication device - Google Patents
Alarm output circuit of communication deviceInfo
- Publication number
- JP2917323B2 JP2917323B2 JP1278906A JP27890689A JP2917323B2 JP 2917323 B2 JP2917323 B2 JP 2917323B2 JP 1278906 A JP1278906 A JP 1278906A JP 27890689 A JP27890689 A JP 27890689A JP 2917323 B2 JP2917323 B2 JP 2917323B2
- Authority
- JP
- Japan
- Prior art keywords
- communication device
- output circuit
- gate
- alarm output
- mosfet
- 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 - Lifetime
Links
Landscapes
- Emergency Alarm Devices (AREA)
- Alarm Systems (AREA)
- Monitoring And Testing Of Transmission In General (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は通信装置に何等かの障害が発生したときグラ
ンドレベル信号を送出する警報出力回路に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm output circuit for transmitting a ground level signal when any trouble occurs in a communication device.
従来、通信装置の警報出力回路は、第２図に示すよう
に、トランジスタ５とトランジスタ駆動回路６とから構
成され、警報出力時にベース電流７を流し、トランジス
タ５をオンしていた。2. Description of the Related Art Conventionally, an alarm output circuit of a communication device has a transistor 5 and a transistor drive circuit 6, as shown in FIG. 2. When an alarm is output, a base current 7 flows and the transistor 5 is turned on.
しかし、上述した従来の警報出力回路では、電源オフ
状態ではトランジスタをオンできないため、グランドレ
ベル信号を送出できず、従い常時通電されたリレーを併
用しなければならず、コストアップになるばかりでな
く、消費電力も増大するという欠点があった。However, in the above-described conventional alarm output circuit, since the transistor cannot be turned on in the power-off state, the ground level signal cannot be transmitted, and therefore, a relay that is always energized must be used together, which not only increases the cost but also increases the cost. However, there is a drawback that power consumption also increases.
本発明は通信装置に障害が発生したときグランドレベ
ル信号を送出する通信装置の警報出力回路において、デ
プレッション型MOSFETと、障害発生時または電源オフ状
態で前記MOSFETのゲート・ソース間電圧をグランドレベ
ルに固定する手段と、正常状態で前記MOSFETのゲート・
ソース間にゲートオフ電圧を印加する手段とを備える。The present invention relates to an alarm output circuit of a communication device for transmitting a ground level signal when a fault occurs in a communication device, wherein a depletion type MOSFET and a gate-source voltage of the MOSFET are set to a ground level when a fault occurs or in a power-off state. Means for fixing the gate of the MOSFET in a normal state.
Means for applying a gate-off voltage between the sources.
次に、本発明について図面を参照して説明する。 Next, the present invention will be described with reference to the drawings.
第１図は本発明の一実施例を示す構成図である。正常
状態では、デプレッション型MOSFET1のゲートには、電
圧発生回路２により、ゲートオフ電圧が印加され、MOSF
ET1はオフ状態にある。警報入力３より警報入力があれ
ば、MOSFET1のゲートには、電圧発生回路２により、グ
ランドレベル電圧が印加され、MOSFET1はオン状態にな
り警報が出力される。また、電源オフ状態では、MOSFET
1のゲートには、抵抗４によりプルダウンされているの
で、グランドレベル電圧が印加され、MOSFET1はオン状
態になり警報が出力される。FIG. 1 is a block diagram showing one embodiment of the present invention. In a normal state, a gate-off voltage is applied to the gate of the depletion-type MOSFET 1 by the voltage generation circuit 2 and the MOSF
ET1 is off. If there is an alarm input from the alarm input 3, a ground level voltage is applied to the gate of the MOSFET 1 by the voltage generation circuit 2, and the MOSFET 1 is turned on to output an alarm. When the power is off, the MOSFET
Since the gate 1 is pulled down by the resistor 4, the ground level voltage is applied, the MOSFET 1 is turned on, and an alarm is output.
〔発明の効果〕 以上説明したように本発明によれば、デプレッション
型MOSFETと、警報出力時または電源オフ状態でゲート・
ソース間電圧をグランドレベルに固定する手段と、正常
状態でゲート・ソース間にゲートオフ電圧を印加する手
段とを備えることにより、従来のように常時通電された
リレーを併用することなく、電源オフ状態でも警報出力
が可能であり、警報出力回路のコストダウン、低消費電
力化及びコンパクト化などの効果がある。[Effects of the Invention] As described above, according to the present invention, a depletion type MOSFET and a gate / gate are provided when an alarm is output or the power is off.
By providing a means for fixing the source-to-source voltage to the ground level and a means for applying a gate-off voltage between the gate and the source in a normal state, the power-off state can be achieved without using a relay that is always energized as in the related art. However, alarm output is possible, and there are effects such as cost reduction, low power consumption, and compactness of the alarm output circuit.
第１図は本発明の一実施例を示す構成図、第２図は従来
の警報出力回路の一例を示す構成図である。 １……デプレッション型MOSFET、２……電圧発生回路、
３……警報入力、４……抵抗、８……警報出力。FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of a conventional alarm output circuit. 1 ... depletion type MOSFET, 2 ... voltage generation circuit,
3 ... Alarm input, 4 ... Resistance, 8 ... Alarm output.
Claims (1)
ベル信号を送出する通信装置の警報出力回路において、
デプレッション型MOSFETと、障害発生時または電源オフ
状態で前記MOSFETのゲート・ソース間電圧をグランドレ
ベルに固定する手段と、正常状態で前記MOSFETのゲート
・ソース間にゲートオフ電圧を印加する手段とを備える
ことを特徴とする通信装置の警報出力回路。An alarm output circuit of a communication device for transmitting a ground level signal when a failure occurs in the communication device,
A depletion-type MOSFET; means for fixing the gate-source voltage of the MOSFET to a ground level when a fault occurs or when the power is off; and means for applying a gate-off voltage between the gate and source of the MOSFET in a normal state. An alarm output circuit for a communication device, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1278906A JP2917323B2 (en) | 1989-10-25 | 1989-10-25 | Alarm output circuit of communication device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1278906A JP2917323B2 (en) | 1989-10-25 | 1989-10-25 | Alarm output circuit of communication device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03139931A JPH03139931A (en) | 1991-06-14 |
| JP2917323B2 true JP2917323B2 (en) | 1999-07-12 |
Family
ID=17603742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1278906A Expired - Lifetime JP2917323B2 (en) | 1989-10-25 | 1989-10-25 | Alarm output circuit of communication device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2917323B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5332989B2 (en) | 2009-07-10 | 2013-11-06 | ソニー株式会社 | Liquid tank and fuel cell |
-
1989
- 1989-10-25 JP JP1278906A patent/JP2917323B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03139931A (en) | 1991-06-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH07109864B2 (en) | Static RAM | |
| JPS6066049U (en) | C-MOS field effect transistor | |
| JPS60120420A (en) | Power multiplexer switch and method thereof | |
| JP2917323B2 (en) | Alarm output circuit of communication device | |
| US5815029A (en) | Semiconductor circuit and semiconductor circuit device | |
| JPS5941205B2 (en) | electronic circuit | |
| JP2563570B2 (en) | Set / reset flip-flop circuit | |
| JPH0159838B2 (en) | ||
| JPH0224293Y2 (en) | ||
| JPH0449706Y2 (en) | ||
| JP2626165B2 (en) | Reset circuit for semiconductor device | |
| JP2647923B2 (en) | Logic circuit | |
| JPS6333922A (en) | Single chip microcomputer | |
| JP2712411B2 (en) | Test circuit | |
| JPS6233348Y2 (en) | ||
| JPS633171Y2 (en) | ||
| JP2512993B2 (en) | Reset circuit | |
| JPH0114735B2 (en) | ||
| JPS59202644A (en) | Semiconductor device | |
| JPS59215122A (en) | Transistor circuit | |
| JPH0552127B2 (en) | ||
| JPH05315933A (en) | Output circuit | |
| JPH0744523A (en) | Otp microcomputer | |
| JPH05283945A (en) | Current mirror circuit | |
| JPS63296507A (en) | Fixing circuit for potential of signal line |