CN202275129U - On/off detection circuit for relay of smart electricity meter - Google Patents
On/off detection circuit for relay of smart electricity meter Download PDFInfo
- Publication number
- CN202275129U CN202275129U CN2011204180397U CN201120418039U CN202275129U CN 202275129 U CN202275129 U CN 202275129U CN 2011204180397 U CN2011204180397 U CN 2011204180397U CN 201120418039 U CN201120418039 U CN 201120418039U CN 202275129 U CN202275129 U CN 202275129U
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- optocoupler
- relay
- pin
- live wire
- electricity meter
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Abstract
The utility model relates to an on/off detection circuit for a relay, in particular to the on/off detection circuit for the relay of a smart electricity meter. The on/off detection circuit comprises an optocoupler protection circuit which is connected with a 220V null line of a mains supply, wherein the output end of the optocoupler protection circuit is connected to the input end of an optocoupler; and the output end of the optocoupler is connected to the output end of a live wire of the mains supply and a singlechip detection circuit. The on/off state of the relay is judged by detecting whether the rear end of the relay (the output end of a live wire of the electricity meter) has a 220V voltage value or not, the relay is in the on state if the rear end of the relay (the output end of the live wire of the electricity meter) has the 220V voltage value, and the relay is in the off state if the rear end of the relay (the output end of the live wire of the electricity meter) does not have the 220V voltage value. The on/off detection circuit for the relay of the smart electricity meter changes current detection into voltage detection, and is low in circuit cost and high in realibility.
Description
Technical field
The utility model relates to the relay on-off testing circuit, is a kind of intelligent electric energy meter relay on-off testing circuit specifically.Said intelligent electric energy meter refers to the single-phase intelligent electric energy meter especially.
Background technology
Along with a large amount of uses of intelligent electric energy meter, all built-in magnetic latching relay of most intelligent electric energy meters needs to detect the relay on-off state.Judge that through detecting current in loop the relay on-off state is the method for at first expecting, but this method can't distinguish in the loop non-loaded and no current and since relay break off and the no current both of these case.
The utility model content
To the defective that exists in the prior art, the purpose of the utility model is to provide a kind of intelligent electric energy meter relay on-off testing circuit, and changing current detecting is voltage detecting, and circuit cost is low, and reliability is high.
For reaching above purpose, the technical scheme that the utility model is taked is:
A kind of intelligent electric energy meter relay on-off testing circuit is characterized in that, comprising:
With the optocoupler holding circuit that civil power 220V zero line is connected, the output terminal of optocoupler holding circuit is connected to the input end of optocoupler,
The output terminal of optocoupler is connected respectively to civil power live wire output terminal and single-chip microcomputer testing circuit.
On the basis of technique scheme, said optocoupler holding circuit comprises three resistance R 71, R72, the R73 of series connection successively,
Resistance R 71, R72, R73 are connected with 1 pin, the 220V voltage zero line N of optocoupler respectively as the current-limiting resistor voltage divider of optocoupler D8/P781,
2 pin of optocoupler are received the output live wire Lout of relay,
The positive pole of diode VD8/M7 is connected with 2 pin of optocoupler, and negative pole is connected with 1 pin of optocoupler,
3 pin ground connection of optocoupler,
4 pin of optocoupler are connected to the RelayTest pin of single-chip microcomputer testing circuit, and simultaneously, 4 pin of optocoupler are connected to power vd D through resistance R 35.
The described intelligent electric energy meter relay on-off of the utility model testing circuit, changing current detecting is voltage detecting, circuit is reliable, accurately stable, simple in structure, with low cost.
Description of drawings
The utility model has following accompanying drawing:
Fig. 1 relay detects theory diagram,
The circuit theory diagrams of Fig. 2 intelligent electric energy meter relay on-off testing circuit.
Embodiment
Below in conjunction with accompanying drawing the utility model is done further explain.
As shown in Figure 1, the described intelligent electric energy meter relay on-off of the utility model testing circuit comprises:
With the optocoupler holding circuit that civil power 220V zero line is connected, the output terminal of optocoupler holding circuit is connected to the input end of optocoupler,
The output terminal of optocoupler is connected respectively to civil power live wire output terminal and single-chip microcomputer testing circuit.
On the basis of technique scheme, said optocoupler holding circuit comprises three resistance R 71, R72, the R73 of series connection successively,
Resistance R 71, R72, R73 are as the current-limiting resistor voltage divider of optocoupler D8/P781; Be connected with 1 pin, the 220V voltage zero line N of optocoupler respectively; That is: zero line N-220 alternating current 220V voltage arrives 1 pin of optocoupler through resistance R 71, R72, R73 (three 120k current-limiting resistor voltage dividers)
2 pin of optocoupler are received the output live wire Lout of relay,
The positive pole of diode VD8/M7 is connected with 2 pin of optocoupler, and negative pole is connected with 1 pin of optocoupler,
3 pin ground connection of optocoupler,
4 pin of optocoupler are connected to the RelayTest pin of single-chip microcomputer testing circuit, and simultaneously, 4 pin of optocoupler are connected to power vd D through resistance R 35.
Comprise diode, current-limiting resistor voltage divider, pull-up resistor, optocoupler in the said circuit of the utility model, diode VD8/M7 has played the effect of protecting optocoupler because of overtension.Whether the utility model has the 220V magnitude of voltage to judge the on off operating mode of relay through detecting relay rear end (electric energy meter live wire output terminal), and it is the logical of relay that 220V voltage is arranged, and no 220V voltage is the disconnected of relay.The concrete course of work is following:
During operate as normal, zero line N-220 alternating current 220V voltage is through 1 pin of three 120k current-limiting resistor voltage dividers to optocoupler, and 2 pin of optocoupler are received the output live wire Lout of relay.
When relay is in "on" position:
When the AC signal of 50Hz was in positive half period, through diode VD8/M7, resistance and zero line constituted the loop, the not conducting of optocoupler D8/P781 diode, and optocoupler 4 pin are in high level (pull-up resistor), and the duration is half ac cycle, i.e. 10ms;
When the AC signal of 50Hz is in negative half-cycle, constitute loop, optocoupler conducting through the diode of optocoupler to the output of relay through current-limiting resistance by zero line; Its 4 pin is a low level; Duration is half ac cycle, i.e. 10ms, and optocoupler 4 pin will be that the rectangle square wave of one-period is sent to single-chip microcomputer with 20ms this moment; Cycling wave form according to this supplies single-chip microcomputer to judge whether operate as normal of relay.
When relay is in when operating a switch:
Live wire goes out Lout under the at this moment normal situation does not have the 220V alternating voltage; Diode VD8/M7 is not owing to constitute the loop and not conducting; Optocoupler D8/P781 can conducting yet; Its 4 pin is owing to there is pull-up resistor can be in high level always, and this moment, single-chip microcomputer will judge that because of detecting lasting high level relay breaks off.
The utility model had both been realized the detection of relay on-off, had protected again because of circuit has succinctly played protective effect to corresponding key components, like the protection to optocoupler.
The content of not doing in this instructions to describe in detail belongs to this area professional and technical personnel's known prior art.
Claims (2)
1. an intelligent electric energy meter relay on-off testing circuit is characterized in that, comprising:
With the optocoupler holding circuit that civil power 220V zero line is connected, the output terminal of optocoupler holding circuit is connected to the input end of optocoupler,
The output terminal of optocoupler is connected respectively to civil power live wire output terminal and single-chip microcomputer testing circuit.
2. intelligent electric energy meter relay on-off testing circuit as claimed in claim 1 is characterized in that: said optocoupler holding circuit comprises three resistance R 71, R72, the R73 of series connection successively,
Resistance R 71, R72, R73 are connected with 1 pin, the 220V voltage zero line N of optocoupler respectively as the current-limiting resistor voltage divider of optocoupler D8/P781,
2 pin of optocoupler are received the output live wire Lout of relay,
The positive pole of diode VD8/M7 is connected with 2 pin of optocoupler, and negative pole is connected with 1 pin of optocoupler,
3 pin ground connection of optocoupler,
4 pin of optocoupler are connected to the RelayTest pin of single-chip microcomputer testing circuit, and simultaneously, 4 pin of optocoupler are connected to power vd D through resistance R 35.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204180397U CN202275129U (en) | 2011-10-28 | 2011-10-28 | On/off detection circuit for relay of smart electricity meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204180397U CN202275129U (en) | 2011-10-28 | 2011-10-28 | On/off detection circuit for relay of smart electricity meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202275129U true CN202275129U (en) | 2012-06-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204180397U Expired - Fee Related CN202275129U (en) | 2011-10-28 | 2011-10-28 | On/off detection circuit for relay of smart electricity meter |
Country Status (1)
| Country | Link |
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| CN (1) | CN202275129U (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889954A (en) * | 2012-10-11 | 2013-01-23 | 中国计量学院 | Method for detecting contact pressure of magnetic latching relay |
| CN104535924A (en) * | 2014-12-30 | 2015-04-22 | 宁波三星电气股份有限公司 | Relay state detection processing circuit and detection processing method of relay state detection processing circuit |
| CN104698291A (en) * | 2015-02-03 | 2015-06-10 | 杭州海兴电力科技股份有限公司 | Detection circuit and detection method for three-phase four-wire system defective zero line function |
| CN105186613A (en) * | 2015-09-11 | 2015-12-23 | 宁波大简智慧科技有限公司 | Charging circuit |
| CN106501716A (en) * | 2016-12-19 | 2017-03-15 | 宁波三星医疗电气股份有限公司 | The single-phase electric meter air switch signal deteching circuit that is sampled based on resistance terminal and method |
| CN106771431A (en) * | 2017-01-18 | 2017-05-31 | 国网江西省电力公司电力科学研究院 | A kind of intelligent electric energy meter of detectable on off state |
| CN107589338A (en) * | 2017-10-12 | 2018-01-16 | 杭州春来科技有限公司 | Grounded inspection circuit and its detection method in continuous on line monitor table |
| CN109444731A (en) * | 2018-11-08 | 2019-03-08 | 北京汇能精电科技股份有限公司 | DC relay closed state detection device |
| CN110031754A (en) * | 2019-04-16 | 2019-07-19 | 江铃汽车股份有限公司 | Detection device, detection method and the electric car of high-voltage relay electric shock state |
| CN112054478A (en) * | 2020-07-30 | 2020-12-08 | 广东史麦斯电器有限公司 | Power abnormity protection device of electric water heater |
| WO2021057407A1 (en) * | 2019-09-27 | 2021-04-01 | 深圳市利成科技有限公司 | New energy vehicle charging protection device relay on-off detection system and method |
| CN112666494A (en) * | 2020-12-30 | 2021-04-16 | 大禹电气科技股份有限公司 | Circuit for detecting three-phase mains power failure |
-
2011
- 2011-10-28 CN CN2011204180397U patent/CN202275129U/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889954A (en) * | 2012-10-11 | 2013-01-23 | 中国计量学院 | Method for detecting contact pressure of magnetic latching relay |
| CN104535924A (en) * | 2014-12-30 | 2015-04-22 | 宁波三星电气股份有限公司 | Relay state detection processing circuit and detection processing method of relay state detection processing circuit |
| CN104698291A (en) * | 2015-02-03 | 2015-06-10 | 杭州海兴电力科技股份有限公司 | Detection circuit and detection method for three-phase four-wire system defective zero line function |
| CN104698291B (en) * | 2015-02-03 | 2018-09-25 | 杭州海兴电力科技股份有限公司 | Three-phase four-wire system lacks zero curve Function detection circuit and detection method |
| CN105186613A (en) * | 2015-09-11 | 2015-12-23 | 宁波大简智慧科技有限公司 | Charging circuit |
| CN106501716B (en) * | 2016-12-19 | 2020-08-18 | 宁波三星医疗电气股份有限公司 | Single-phase electric meter open signal detection circuit and method based on resistance end sampling |
| CN106501716A (en) * | 2016-12-19 | 2017-03-15 | 宁波三星医疗电气股份有限公司 | The single-phase electric meter air switch signal deteching circuit that is sampled based on resistance terminal and method |
| CN106771431A (en) * | 2017-01-18 | 2017-05-31 | 国网江西省电力公司电力科学研究院 | A kind of intelligent electric energy meter of detectable on off state |
| CN106771431B (en) * | 2017-01-18 | 2020-11-03 | 国网江西省电力公司电力科学研究院 | Intelligent electric energy meter capable of detecting on-off state |
| CN107589338A (en) * | 2017-10-12 | 2018-01-16 | 杭州春来科技有限公司 | Grounded inspection circuit and its detection method in continuous on line monitor table |
| CN109444731A (en) * | 2018-11-08 | 2019-03-08 | 北京汇能精电科技股份有限公司 | DC relay closed state detection device |
| CN110031754A (en) * | 2019-04-16 | 2019-07-19 | 江铃汽车股份有限公司 | Detection device, detection method and the electric car of high-voltage relay electric shock state |
| WO2021057407A1 (en) * | 2019-09-27 | 2021-04-01 | 深圳市利成科技有限公司 | New energy vehicle charging protection device relay on-off detection system and method |
| CN112054478A (en) * | 2020-07-30 | 2020-12-08 | 广东史麦斯电器有限公司 | Power abnormity protection device of electric water heater |
| CN112666494A (en) * | 2020-12-30 | 2021-04-16 | 大禹电气科技股份有限公司 | Circuit for detecting three-phase mains power failure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120613 Termination date: 20161028 |