CN203337786U - An electric energy meter load switch detecting circuit - Google Patents
An electric energy meter load switch detecting circuit Download PDFInfo
- Publication number
- CN203337786U CN203337786U CN2013203470781U CN201320347078U CN203337786U CN 203337786 U CN203337786 U CN 203337786U CN 2013203470781 U CN2013203470781 U CN 2013203470781U CN 201320347078 U CN201320347078 U CN 201320347078U CN 203337786 U CN203337786 U CN 203337786U
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- optocoupler
- diode
- electric energy
- energy meter
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Abstract
The utility model discloses an electric energy meter load switch detecting circuit. A live wire inlet end L-IN is connected with a resistor R1 which is connected with the positive pole of a diode D1. The negative pole of the diode D1 is connected with the first pin of an optical coupler OP1. The second pin of the optical coupler OP1 is connected with a null line N. The fourth pin of the optical coupler OP1 is connected with a resistor R2. A live wire outlet end L-OUT is connected with a resistor R3 which is connected with the positive pole of a diode D2. The negative pole of the diode D2 is connected with the first pin of an optical coupler OP2. The second pin of the optical coupler OP2 is connected with the null line N. The fourth pin of the optical coupler OP2 is connected with a resistor R4. One end of each of the resistor R3 and the resistor R4 are input ends of two signals, respectively. If the inlet end and outlet end of the live wire of an electric energy meter are connected reversely, a signal B is set as 0 all the time; a signal A is set as 1 when a switch is switched off and is set as 0 when the switch is switched on. Namely, the two signals are same if the switch is switched on and are not same if the switch is switched off, being the same as a case in correct wire connection. Therefore, normal judgment is not affected. In addition, whether the electric energy meter is connected reversely can be determined because of the difference between the signal A in reverse connection and the signal A in normal connection.
Description
Technical field
The utility model relates to a kind of electric energy meter on-load switch testing circuit.
Background technology
Existing electric energy meter on-load switch testing circuit is: as shown in Figure 1, the live wire output terminal L-OUT of on-load switch meets 500K Ω current-limiting resistance R1, after meet a diode D1, prevent that electric current is reverse, then meet optocoupler OP1, after in zero line N, join.
When on-load switch disconnects, optocoupler OP1 no current, do not move, its secondary 3,4 not conductings of end, and signal A is set to high level " 1 "; When on-load switch is closed, form loop between L-OUT and zero line N, optocoupler OP1 operation, 3,4 end conductings, signal A is set to low level " 0 "; MCU receives signal A and compares with the switch command of sending, thus judgement on-load switch action correctness.Shortcoming: when " live wire advances " terminal and " live wire goes out " terminal connect inverse time when electric energy meter is installed, electric energy meter just can't correctly judge the on-load switch state.The circuit that inspection does not simultaneously measure electric energy meter connects opposite state.
The utility model content
The utility model purpose is exactly in order to make up the defect of prior art, and a kind of electric energy meter on-load switch testing circuit is provided.
The utility model is achieved through the following technical solutions:
A kind of electric energy meter on-load switch testing circuit, include the live wire inlet side L-IN of on-load switch, live wire output terminal L-OUT and zero line N, described live wire inlet side L-IN contact resistance R1, resistance R 1 connects the positive pole of diode D1, the negative pole of diode D1 connects the first pin of optocoupler OP1, the second pin of optocoupler OP1 connects zero line N, the 3rd pin ground connection of optocoupler OP1, the 4th pin connecting resistance R2 of optocoupler OP1, described live wire output terminal L-OUT contact resistance R3, resistance R 3 connects the positive pole of diode D2, the negative pole of diode D2 connects the first pin of optocoupler OP2, the second pin of optocoupler OP2 connects zero line N, the 3rd pin ground connection of optocoupler OP2, the 4th pin connecting resistance R4 of optocoupler OP2, one end of resistance R 3 and resistance R 4 is respectively the input end of two signals.
The utility model has the advantages that: the live wire turnover termination inverse time of electric energy meter of the present utility model, signal B set all the time " 0 ", and signal A set when switch disconnects " 1 ", set " 0 " when closed, both signals when switch is closed are identical, signal difference during disconnection, identical during with correct wiring, do not affect normal judgement, the difference when normal due to the signal of signal A simultaneously, whether the wiring that can judge again thus electric energy meter connects instead.
The accompanying drawing explanation
The electric energy meter on-load switch testing circuit figure that Fig. 1 is prior art.
Fig. 2 is circuit diagram of the present utility model.
Embodiment
As shown in Figure 2, a kind of electric energy meter on-load switch testing circuit, include the live wire inlet side L-IN of on-load switch, live wire output terminal L-OUT and zero line N, described live wire inlet side L-IN contact resistance R1, resistance R 1 connects the positive pole of diode D1, the negative pole of diode D1 connects the first pin of optocoupler OP1, the second pin of optocoupler OP1 connects zero line N, the 3rd pin ground connection of optocoupler OP1, the 4th pin connecting resistance R2 of optocoupler OP1, described live wire output terminal L-OUT contact resistance R3, resistance R 3 connects the positive pole of diode D2, the negative pole of diode D2 connects the first pin of optocoupler OP2, the second pin of optocoupler OP2 connects zero line N, the 3rd pin ground connection of optocoupler OP2, the 4th pin connecting resistance R4 of optocoupler OP2, one end of resistance R 3 and resistance R 4 is respectively the input end of two signals.
Claims (1)
1. an electric energy meter on-load switch testing circuit, it is characterized in that: the live wire inlet side L-IN that includes on-load switch, live wire output terminal L-OUT and zero line N, described live wire inlet side L-IN contact resistance R1, resistance R 1 connects the positive pole of diode D1, the negative pole of diode D1 connects the first pin of optocoupler OP1, the second pin of optocoupler OP1 connects zero line N, the 3rd pin ground connection of optocoupler OP1, the 4th pin connecting resistance R2 of optocoupler OP1, described live wire output terminal L-OUT contact resistance R3, resistance R 3 connects the positive pole of diode D2, the negative pole of diode D2 connects the first pin of optocoupler OP2, the second pin of optocoupler OP2 connects zero line N, the 3rd pin ground connection of optocoupler OP2, the 4th pin connecting resistance R4 of optocoupler OP2, one end of resistance R 3 and resistance R 4 is respectively the input end of two signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203470781U CN203337786U (en) | 2013-06-17 | 2013-06-17 | An electric energy meter load switch detecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203470781U CN203337786U (en) | 2013-06-17 | 2013-06-17 | An electric energy meter load switch detecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203337786U true CN203337786U (en) | 2013-12-11 |
Family
ID=49706453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203470781U Expired - Lifetime CN203337786U (en) | 2013-06-17 | 2013-06-17 | An electric energy meter load switch detecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203337786U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111722101A (en) * | 2020-05-29 | 2020-09-29 | 宁波三星医疗电气股份有限公司 | Detection circuit and protection method of double-loop relay |
| CN111934306A (en) * | 2020-08-20 | 2020-11-13 | 浙江树人学院（浙江树人大学） | Battery sampling line misconnection protection circuit and method in BMS system |
-
2013
- 2013-06-17 CN CN2013203470781U patent/CN203337786U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111722101A (en) * | 2020-05-29 | 2020-09-29 | 宁波三星医疗电气股份有限公司 | Detection circuit and protection method of double-loop relay |
| CN111722101B (en) * | 2020-05-29 | 2023-09-01 | 宁波三星医疗电气股份有限公司 | Detection circuit and protection method of double-loop relay |
| CN111934306A (en) * | 2020-08-20 | 2020-11-13 | 浙江树人学院（浙江树人大学） | Battery sampling line misconnection protection circuit and method in BMS system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131211 |