CN203688623U - Circuit for detecting current signal - Google Patents
Circuit for detecting current signal Download PDFInfo
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- CN203688623U CN203688623U CN201320618260.6U CN201320618260U CN203688623U CN 203688623 U CN203688623 U CN 203688623U CN 201320618260 U CN201320618260 U CN 201320618260U CN 203688623 U CN203688623 U CN 203688623U
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- resistance
- triode
- circuit
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- amplifier integrated
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Abstract
The utility model discloses a circuit for detecting a current signal. The circuit includes a current reference circuit (1), an operational amplifier integrated chip N1 and an output circuit (2). One comparing input terminal of the operational amplifying integrated chip N1 is used for the input of voltage values of current values of a, b and c phases. The other comparing input terminal of the operational amplifier integrated chip N1 is connected to the current reference circuit (1). An input terminal of the output circuit(2) is connected to an output terminal of the operational amplifier integrated chip N1. An output terminal of the output circuit(2) is an output terminal of the circuit for detecting the current signal. The circuit provided by the invention is accurate in detection and low in power consumption.
Description
Technical field
The utility model relates to three-phase intelligent ammeter technical field, is specifically a kind of whether current signal detection circuit in full decompression state of three-phase intelligent ammeter that judges.
Background technology
At present the voltage and current signal of three-phase intelligent table is that separately independently that is: the input/output terminal of Ua and Ia is independent of one another, the break-make of voltage on current signal without impact.According to state's network mark standard: when voltage disconnects, when current signal has arbitrary phase or heterogeneous load current to be greater than 5% rated current, now think that three-phase power supply system is in full decompression state.In the time that rated current is 0.3A, 5% specified (substantially) electric current is 0.015A, and now electric current is very little, and the current signal detection circuit of prior art is lower in accuracy in detection.Open computation chip if adopt and detect electric current, although detection is more accurate, power consumption is larger, thereby causes the shortening of battery.
Utility model content
The technical problems to be solved in the utility model is, overcomes the defect of above prior art, provides a kind of accuracy in detection current signal detection circuit high and low in energy consumption.
The technical solution of the utility model is, a kind of current signal detection circuit is provided, and comprises a current reference circuit, amplifier integrated chip N1, output circuit; A magnitude of voltage input that relatively input end supplies a, b, tri-phase current values of c of described amplifier integrated chip N1; Another of described amplifier integrated chip N1 relatively input end is connected with current reference circuit; The input end of described output circuit is connected with the output terminal of amplifier integrated chip N1; The output terminal of described output circuit is the output terminal of current signal detection circuit.
Described current reference circuit comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and the 5th resistance R 5; One end of described the first resistance R 1 is connected with direct supply VCC; The other end of described the first resistance R 1 is connected with one end of the second resistance R 2, one end of the 3rd resistance R 3, one end of the 4th resistance R 4, another comparison input end of amplifier integrated chip N1; The other end of the other end of described the second resistance R 2, the other end of the 3rd resistance R 3, the 4th resistance R 4 is connected with one end of the 5th resistance R 5; One end of described the 5th resistance R 5 is connected with common ground end.
Described output circuit comprises the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R 10, diode VD1, the first triode V1, the second triode V2, the 3rd triode V3; One end of one end of described the 6th resistance R 6, one end of the 7th resistance R 7, the 8th resistance R 8 is connected with the output terminal of amplifier integrated chip N1; The other end of the other end of described the 6th resistance R 6, the other end of the 7th resistance R 7, the 8th resistance R 8 is connected with the base stage of the first triode V1, the base stage of the second triode V2, the base stage of the 3rd triode V3 respectively; One end of described the 9th resistance R 9 is connected with direct supply VCC; The anodic bonding of the other end of described the 9th resistance R 9 and diode VD1; The negative electrode of described diode VD1 is connected with one end of the tenth resistance R 10, the collector of the first triode V1, the collector of the second triode V2, the collector of the 3rd triode V3; The emitter of the emitter of described the first triode V1, the emitter of the second triode V2, the 3rd triode V3 is connected with common ground end; The other end of described the tenth resistance R 10 is the output terminal of testing circuit.
The model of described amplifier integrated chip N1 is LM2902KAV.
Adopt after above structure, the utility model compared with prior art, has the following advantages:
This circuit of the utility model current signal detection circuit adopts an amplifier integrated chip cheaply, by the parameter of current reference circuit, the voltage of adjustable amplifier negative input, for the different current point of matching detection, in the time that the positive pole of amplifier is less than or equal to negative pole input voltage, amplifier no-output, a logic high of circuit output, and have mutually an electric current when arbitrary, and when electric current generation voltage signal has exceeded the voltage of amplifier negative pole coupling, the output of the amplifier of this phase makes triode conducting below, makes a logic low of circuit output.The power consumption of this circuit is lower, and showing meter only needs an IO mouth detect this circuit output, has simplified logic, and the precision of detection can pass through to improve the enlargement factor of amplifier, thereby meets the testing requirement of state's net three-phase intelligent table 5% rated current.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of the utility model current signal detection circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1, a kind of current signal detection circuit of the utility model, comprises a current reference circuit 1, amplifier integrated chip N1, output circuit 2; A magnitude of voltage input that relatively input end supplies a, b, tri-phase current values of c of described amplifier integrated chip N1; Another of described amplifier integrated chip N1 relatively input end is connected with current reference circuit 1; The input end of described output circuit 2 is connected with the output terminal of amplifier integrated chip N1; The output terminal of described output circuit 2 is the output terminal of current signal detection circuit.
Described current reference circuit 1 comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and the 5th resistance R 5; One end of described the first resistance R 1 is connected with direct supply VCC; The other end of described the first resistance R 1 is connected with one end of the second resistance R 2, one end of the 3rd resistance R 3, one end of the 4th resistance R 4, another comparison input end of amplifier integrated chip N1; The other end of the other end of described the second resistance R 2, the other end of the 3rd resistance R 3, the 4th resistance R 4 is connected with one end of the 5th resistance R 5; One end of described the 5th resistance R 5 is connected with common ground end.
Described output circuit 2 comprises the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R 10, diode VD1, the first triode V1, the second triode V2, the 3rd triode V3, the first capacitor C 1; One end of one end of described the 6th resistance R 6, one end of the 7th resistance R 7, the 8th resistance R 8 is connected with the output terminal of amplifier integrated chip N1; The other end of the other end of described the 6th resistance R 6, the other end of the 7th resistance R 7, the 8th resistance R 8 is connected with the base stage of the first triode V1, the base stage of the second triode V2, the base stage of the 3rd triode V3 respectively; One end of described the 9th resistance R 9 is connected with direct supply VCC; The anodic bonding of the other end of described the 9th resistance R 9 and diode VD1; The negative electrode of described diode VD1 is connected with one end of the tenth resistance R 10, the collector of the first triode V1, the collector of the second triode V2, the collector of the 3rd triode V3; The emitter of the emitter of described the first triode V1, the emitter of the second triode V2, the 3rd triode V3 is connected with common ground end; The other end of described the tenth resistance R 10 is the output terminal of current signal detection circuit.
The model of described amplifier integrated chip N1 is LM2902KAV, and the peripheral circuit of amplifier integrated chip N1 as shown in Figure 1; U_Ia, U_Ib, U_Ic are connected with 1IN+, 2IN+, the 3IN+ of amplifier integrated chip N1 respectively, and the other end of the first resistance R 1 is connected with 1IN-, 2IN-, 3IN.
This circuit has only been used amplifier integrated chip N1 three amplifiers wherein, and the negative pole of these three amplifiers connects together, adopt same reference point, by changing resistance R 1, R2, R3, R4, the size of R5, the voltage of adjustable amplifier negative input, the voltage signal U_Ia that its specified with 5% (substantially) electric current is produced is consistent, in the time that the current signal of the anodal input of amplifier is greater than the voltage that 5% rated current produces, between the positive pole of amplifier and negative pole, have a voltage difference+VIN, this voltage amplifies through amplifier, can produce a larger current signal, through R6 resistance, make to produce pressure reduction between the base stage of triode and emitter, cause transistor collector and emitter conducting, thereby the negative pole place voltage of diode VD1 is dragged down, make this circuit output LOW voltage, from this circuit, can see, three triodes, any one conducting, capital drags down the negative pole place voltage of diode VD1, making circuit output end I/O_CHK is logic low, that is: in three-phase, arbitrary phase current is greater than 5% rated current, circuit all can output logic low level, if three-phase current is all less than 5% rated current, circuit output logic high level.
Below be only described with regard to most preferred embodiment of the present utility model, but can not be interpreted as it is limitations on claims.The utility model is not limited only to above embodiment, and its concrete structure allows to change.In every case the various variations of doing in the protection domain of the utility model independent claims are all in protection domain of the present utility model.
Claims (4)
1. a current signal detection circuit, is characterized in that: comprise a current reference circuit (1), amplifier integrated chip N1, output circuit (2); A magnitude of voltage input that relatively input end supplies a, b, tri-phase current values of c of described amplifier integrated chip N1; Another of described amplifier integrated chip N1 relatively input end is connected with current reference circuit (1); The input end of described output circuit (2) is connected with the output terminal of amplifier integrated chip N1; The output terminal that the output terminal of described output circuit (2) is current signal detection circuit.
2. current signal detection circuit according to claim 1, is characterized in that: described current reference circuit (1) comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4 and the 5th resistance R 5; One end of described the first resistance R 1 is connected with direct supply VCC; The other end of described the first resistance R 1 is connected with one end of the second resistance R 2, one end of the 3rd resistance R 3, one end of the 4th resistance R 4, another comparison input end of amplifier integrated chip N1; The other end of the other end of described the second resistance R 2, the other end of the 3rd resistance R 3, the 4th resistance R 4 is connected with one end of the 5th resistance R 5; One end of described the 5th resistance R 5 is connected with common ground end.
3. current signal detection circuit according to claim 2, is characterized in that: described output circuit (2) comprises the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R 10, diode VD1, the first triode V1, the second triode V2, the 3rd triode V3; One end of one end of described the 6th resistance R 6, one end of the 7th resistance R 7, the 8th resistance R 8 is connected with the output terminal of amplifier integrated chip N1; The other end of the other end of described the 6th resistance R 6, the other end of the 7th resistance R 7, the 8th resistance R 8 is connected with the base stage of the first triode V1, the base stage of the second triode V2, the base stage of the 3rd triode V3 respectively; One end of described the 9th resistance R 9 is connected with direct supply VCC; The anodic bonding of the other end of described the 9th resistance R 9 and diode VD1; The negative electrode of described diode VD1 is connected with one end of the tenth resistance R 10, the collector of the first triode V1, the collector of the second triode V2, the collector of the 3rd triode V3; The emitter of the emitter of described the first triode V1, the emitter of the second triode V2, the 3rd triode V3 is connected with common ground end; The other end of described the tenth resistance R 10 is the output terminal of testing circuit.
4. current signal detection circuit according to claim 3, is characterized in that: the model of described amplifier integrated chip N1 is LM2902KAV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320618260.6U CN203688623U (en) | 2013-09-30 | 2013-09-30 | Circuit for detecting current signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320618260.6U CN203688623U (en) | 2013-09-30 | 2013-09-30 | Circuit for detecting current signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203688623U true CN203688623U (en) | 2014-07-02 |
Family
ID=51010508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320618260.6U Expired - Lifetime CN203688623U (en) | 2013-09-30 | 2013-09-30 | Circuit for detecting current signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203688623U (en) |
-
2013
- 2013-09-30 CN CN201320618260.6U patent/CN203688623U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 315191 Yinzhou Industrial Park, Zhejiang, Ningbo, Yinzhou District, Ningbo Patentee after: NINGBO SANXING MEDICAL & ELECTRIC Co.,Ltd. Address before: 315131, AUX Industrial Park, Mingguang North Road, Jiangshan Town, Ningbo, Yinzhou District, Zhejiang 1166, China Patentee before: NINGBO SANXING ELECTRIC Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20140702 |
|
| CX01 | Expiry of patent term |