JPH0370021U - - Google Patents
Info
- Publication number
- JPH0370021U JPH0370021U JP13024889U JP13024889U JPH0370021U JP H0370021 U JPH0370021 U JP H0370021U JP 13024889 U JP13024889 U JP 13024889U JP 13024889 U JP13024889 U JP 13024889U JP H0370021 U JPH0370021 U JP H0370021U
- Authority
- JP
- Japan
- Prior art keywords
- detection circuit
- line voltage
- phase detection
- open phase
- power supply
- 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
- 238000001514 detection method Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
Description
第１図および第２図は本考案の一実施例を示し
、第１図は欠相検出回路および受信回路を示す回
路構成図、第２図は３相電源に欠相検出回路を接
続した状態を示す説明図である。
１……３相電源、２，２Ａ……欠相検出回路、
８……発光ダイオード（発光素子）、８Ａ，８Ｂ
……フオトトランジスタ（受光素子）、９……ト
ランジスタ（スイツチング素子）、１０……ツエ
ナーダイオード。
Fig. 1 and Fig. 2 show an embodiment of the present invention, Fig. 1 is a circuit configuration diagram showing an open phase detection circuit and a receiving circuit, and Fig. 2 shows a state in which the open phase detection circuit is connected to a three-phase power supply. FIG. 1...3-phase power supply, 2,2A...open phase detection circuit,
8... Light emitting diode (light emitting element), 8A, 8B
. . . Phototransistor (light receiving element), 9 . . . Transistor (switching element), 10 . . . Zener diode.
Claims (1)
出回路を接続する３相電源の欠相検出回路におい
て、フオトカプラを制御するスイツチング素子に
線間電圧の分圧をツエナーダイオードを介して印
加させてフオトカプラの発光素子を発光させ、線
間電圧の降下によりツエナーダイオードを介して
スイツチング素子をオフし発光素子の発光を停止
することを特徴とする３相電源の欠相検出回路。 In an open phase detection circuit for a three-phase power supply that connects an open phase detection circuit that detects a drop in line voltage between lines, a partial voltage of the line voltage is applied via a Zener diode to the switching element that controls the photocoupler. 1. An open phase detection circuit for a three-phase power supply, characterized in that a light emitting element of a photocoupler is caused to emit light, and a drop in line voltage causes a switching element to be turned off via a Zener diode, thereby stopping the light emitting element from emitting light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13024889U JPH083144Y2 (en) | 1989-11-08 | 1989-11-08 | Open-phase detection circuit for 3-phase power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13024889U JPH083144Y2 (en) | 1989-11-08 | 1989-11-08 | Open-phase detection circuit for 3-phase power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0370021U true JPH0370021U (en) | 1991-07-12 |
| JPH083144Y2 JPH083144Y2 (en) | 1996-01-29 |
Family
ID=31677834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13024889U Expired - Lifetime JPH083144Y2 (en) | 1989-11-08 | 1989-11-08 | Open-phase detection circuit for 3-phase power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH083144Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001296324A (en) * | 2000-04-18 | 2001-10-26 | Yaskawa Electric Corp | Sensing circuit for open phase of three-phase power supply |
| JP2007017187A (en) * | 2005-07-05 | 2007-01-25 | Hitachi Industrial Equipment Systems Co Ltd | Phase interruption detection circuit |
-
1989
- 1989-11-08 JP JP13024889U patent/JPH083144Y2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001296324A (en) * | 2000-04-18 | 2001-10-26 | Yaskawa Electric Corp | Sensing circuit for open phase of three-phase power supply |
| JP4687839B2 (en) * | 2000-04-18 | 2011-05-25 | 株式会社安川電機 | 3-phase power supply phase loss detection circuit |
| JP2007017187A (en) * | 2005-07-05 | 2007-01-25 | Hitachi Industrial Equipment Systems Co Ltd | Phase interruption detection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH083144Y2 (en) | 1996-01-29 |
Similar Documents
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |