JPH02133148U - - Google Patents
Info
- Publication number
- JPH02133148U JPH02133148U JP3942189U JP3942189U JPH02133148U JP H02133148 U JPH02133148 U JP H02133148U JP 3942189 U JP3942189 U JP 3942189U JP 3942189 U JP3942189 U JP 3942189U JP H02133148 U JPH02133148 U JP H02133148U
- Authority
- JP
- Japan
- Prior art keywords
- photocoupler
- switching transistor
- light receiving
- base
- voltage
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 5
- 238000009499 grossing Methods 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
Description
第１図はこの考案による停電検出回路の一実施
例を示す回路図、第２図Ａ，Ｂは第１図の実施例
による停電時の入力交流電圧、発光部に印加され
る電流、直流出力電圧の変化を示すタイムチヤー
トである。第３図は従来の停電検出回路の一例を
示す回路図、第４図Ａ，Ｂは第１図の実施例によ
る停電時の入力交流電圧、発光部に印加される電
流、直流出力電圧の変化を示すタイムチヤートで
ある。
１０……停電検出回路、１１ａ，１１ｂ……入
力端子、１２……ブリツジ整流回路、１３……平
滑回路、１４……フオトカプラ、１４ａ……発光
部、１４ｂ……受光部、１５……直流出力端子、
１６……アース端子、１７……スイツチングトラ
ンジスタ、１８，１９，１４ｃ……抵抗、２０…
…ツエナーダイオード、２１……コンデンサ。
Figure 1 is a circuit diagram showing one embodiment of the power failure detection circuit according to this invention, and Figures 2A and B are the input AC voltage, current applied to the light emitting part, and DC output at the time of power failure according to the embodiment of Figure 1. This is a time chart showing changes in voltage. Figure 3 is a circuit diagram showing an example of a conventional power outage detection circuit, and Figures 4A and B are changes in input AC voltage, current applied to the light emitting part, and DC output voltage during power outage according to the embodiment shown in Figure 1. This is a time chart showing. 10... Power failure detection circuit, 11a, 11b... Input terminal, 12... Bridge rectifier circuit, 13... Smoothing circuit, 14... Photo coupler, 14a... Light emitting section, 14b... Light receiving section, 15... DC output terminal,
16... Earth terminal, 17... Switching transistor, 18, 19, 14c... Resistor, 20...
...Zener diode, 21...capacitor.
Claims (1)
を介して接続されたフオトカプラの発光部と、直
流定電圧が印加される直流出力端子とアースとの
間に挿入されたスイツチングトランジスタと、該
スイツチングトランジスタのベース電圧が印加さ
れるベースとアースとの間に接続された抵抗に対
して並列に接続された上記フオトカプラの受光部
とを含んでいる停電検出回路において、 上記平滑回路が抵抗のみから構成されており、
上記フオトカプラの受光部が、該スイツチングト
ランジスタのベースに対してツエナーダイオード
を介して接続されると共に、該受光部に並列にコ
ンデンサが接続されていることを特徴とする停電
検出回路。[Claims for Utility Model Registration] A photocoupler that is inserted between the light emitting part of the photocoupler connected to the primary AC power source via a rectifying circuit and a smoothing circuit, and the DC output terminal to which a constant DC voltage is applied and the ground. A power outage detection circuit comprising a switching transistor and a light receiving portion of the photocoupler connected in parallel to a resistor connected between a base to which a base voltage of the switching transistor is applied and ground. , the above smoothing circuit consists only of resistors,
A power failure detection circuit characterized in that a light receiving section of the photocoupler is connected to the base of the switching transistor via a Zener diode, and a capacitor is connected in parallel to the light receiving section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3942189U JPH02133148U (en) | 1989-04-03 | 1989-04-03 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3942189U JPH02133148U (en) | 1989-04-03 | 1989-04-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02133148U true JPH02133148U (en) | 1990-11-05 |
Family
ID=31548317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3942189U Pending JPH02133148U (en) | 1989-04-03 | 1989-04-03 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02133148U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6473259A (en) * | 1987-09-14 | 1989-03-17 | Nec Corp | Instantaneous interruption detection for ac power supply |
-
1989
- 1989-04-03 JP JP3942189U patent/JPH02133148U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6473259A (en) * | 1987-09-14 | 1989-03-17 | Nec Corp | Instantaneous interruption detection for ac power supply |
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