CN204287311U - A kind of three-phase current sample circuit - Google Patents
A kind of three-phase current sample circuit Download PDFInfo
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- CN204287311U CN204287311U CN201420775134.6U CN201420775134U CN204287311U CN 204287311 U CN204287311 U CN 204287311U CN 201420775134 U CN201420775134 U CN 201420775134U CN 204287311 U CN204287311 U CN 204287311U
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Abstract
The utility model discloses a kind of three-phase current sample circuit, comprise the current transformer module, circuit protection module, Signal-regulated kinase and the ADC sampling module that connect successively; Also comprise a mutual inductor plate and a CPU board, described current transformer module and circuit protection module are located on mutual inductor plate, and described Signal-regulated kinase and ADC sampling module are located in CPU board; Described Current Mutual Inductance module comprises multiple current transformer; Described Signal-regulated kinase comprises stabilized voltage supply and discharge circuit, and described stabilized voltage supply is connected with discharge circuit, and stabilized voltage supply provides DC offset voltage for discharge circuit; Described discharge circuit is used for amplified current signal, and the input end of discharge circuit is connected with described current transformer, and the output terminal of discharge circuit is connected with ADC sampling module.Current sampling circuit of the present utility model, the compatibility of circuit is good, and module is portable strong, installs safety, maintains easily.
Description
Technical field
The utility model belongs to circuit engineering field, is specifically related to a kind of three-phase current sample circuit.
Background technology
Often need in current electric system to measure phase current or line current, the monitoring of electric current to the quality of power supply and the maintenance to grid equipment have great significance.In electric system, general electric current access way is divided into star-like and two kinds, triangle, and phase current refers to the electric current flowing through every phase power supply (load), and line current refers to the electric current flowing through end line, and for delta connection, phase current equals line current; Wye connection, line current equals phase current and is multiplied by radical sign three.
The measuring of the current quality of power supply is all directly by the mode of ready-made electric energy computation chip, be made with following shortcoming like this: 1. electric energy computation chip is a kind of integrated circuit (IC) chip, concrete purposes has been defined, for detecting the poor compatibility of different Circuits System when dispatching from the factory; 2. electric energy computation chip function singleness, portability is not strong; 3. whole chip can only itself replace by electric energy computation chip upgrading, but the variant meeting of chip pin brings very large trouble, and this upgrading mode cost is high and very inconvenient.
Utility model content
The object that the utility model solves is as solving above-mentioned the problems of the prior art, thus designs a kind of three-phase current sample circuit, has the advantages that circuit compatibility is good, plate is portable by force, installation is safe, easy to maintenance.
The technical scheme adopted for realizing the purpose of this utility model is: a kind of three-phase current sample circuit, comprises the current transformer module, circuit protection module, Signal-regulated kinase and the ADC sampling module that connect successively; Also comprise a mutual inductor plate and a CPU board, described current transformer module and circuit protection module are located on mutual inductor plate, and described Signal-regulated kinase and ADC sampling module are located in CPU board; Described Current Mutual Inductance module comprises multiple current transformer; Described Signal-regulated kinase comprises stabilized voltage supply and discharge circuit, and described stabilized voltage supply is connected with discharge circuit, and stabilized voltage supply provides DC offset voltage for discharge circuit; Described discharge circuit is used for amplified current signal, and the input end of discharge circuit is connected with described current transformer, and the output terminal of discharge circuit is connected with ADC sampling module.
Preferably, described circuit protection module comprises multiple Transient Suppression Diode, and described Transient Suppression Diode is connected with described current transformer.
Preferably, described current transformer is straight-through current transformer.
Preferably, described ADC sampling module is the ADC sampling unit being integrated in STM32 single-chip microcomputer inside, and the ADC interface of described STM32 single-chip microcomputer is connected with described discharge circuit.
Preferably, described ADC sampling module comprises analog-digital chip.
Preferably, described discharge circuit comprises operational amplifier.
Preferably, the bias voltage that described stabilized voltage supply provides is 1.65V.
Preferably, the precision of described current transformer is higher than 0.2S.
Disparate modules divides and is opened on different circuit boards by three-phase current of the present utility model, removably connected by electric wire between plate, there is ductility, by Signal-regulated kinase relatively high for the requirement to working environment and ADC sampling module away from high-tension bus-bar, also process is maintained easily, and modularization is installed, and has good compatibility and extendability.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model three-phase current sample circuit
Fig. 2 is the circuit diagram of the utility model three-phase current sample circuit
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further:
As shown in Figure 1, be the module connection structure schematic diagram of the present embodiment, the three-phase current sample circuit of the present embodiment, comprises the current transformer module 30, circuit protection module 40, Signal-regulated kinase 50 and the ADC sampling module 60 that connect successively; Described current transformer module 30 and circuit protection module 40 are arranged on mutual inductor plate 10, and described Signal-regulated kinase 50 and ADC sampling module 60 are located in CPU board (control panel).
Disparate modules divides and is opened on different circuit boards by the present embodiment, removably connected by electric wire between plate, there is ductility, by Signal-regulated kinase relatively high for the requirement to working environment and ADC sampling module away from high-tension bus-bar, also process is maintained easily, and modularization is installed, and has good compatibility and extendability.
As shown in Figure 2, be the circuit connection diagram of the present embodiment, in figure, comprise interconnective current transformer module 30, circuit protection module 40, Signal-regulated kinase 50 and ADC sampling module 60 from left to right successively.
Described current transformer module 30 comprises three straight-through current transformers be connected with three-phase current respectively, and its model selected of the present embodiment is zmct102a.In figure three-phase current respectively with the IA1 of three current transformers, IA2, IB1, IB2, IC1, IC2 interface connects.
Described circuit protection module 40 comprises three Transient Suppression Diode D2 be connected with described three current transformers respectively, and D4, D6, for the protection of current transformer.Having connect a Transient Suppression Diode after current transformer, is in order to overcurrent protection like this, avoids device to burn.
After described Signal-regulated kinase 50 is connected to circuit protection module; Signal-regulated kinase 50 comprises stabilized voltage supply and discharge circuit; described stabilized voltage supply is connected with discharge circuit; stabilized voltage supply provides DC offset voltage for discharge circuit; the input end of described discharge circuit is connected with current transformer; discharge circuit is used for amplified current signal, and the output terminal of described discharge circuit is connected with ADC sampling module.
Signal-regulated kinase 50 specifically comprises:
The discharge circuit connecting first-phase current signal comprises resistance R1, R2, R3, R4, R5, electric capacity C1, C2, C3, and operational amplifier, and as shown in FIG., the pin 1 of its operational amplifier is connected with the interface 1 of the ADC port of ADC sampling module annexation.
Same, the discharge circuit being connected to second-phase electric current comprises resistance R6, R7, R8, R9, R10, electric capacity C4, C5, C6, and operational amplifier, as shown in FIG., the pin 1 of its operational amplifier is connected with the interface 2 of the ADC port of ADC sampling module annexation.
Same, the discharge circuit being connected to third phase electric current comprises resistance R11, R12, R13, R14, R15, electric capacity C7, C8, C9, and operational amplifier, as shown in FIG., the pin 1 of its operational amplifier is connected with the interface 3 of the ADC port of ADC sampling module annexation.
One end of described resistance R5, R10, R15 connects the DC offset voltage REFO that stabilized voltage supply provides, and the other end is connected with the pin 3 of respective operational amplifier respectively.Adopt high-precision operational amplifier in discharge circuit, the value making ADC sample like this is more accurate as far as possible.
Three-phase current sample circuit as shown in Figure 2, after input three-phase current, electric current is transformed by described mutual inductor equal proportion, and the electric current of conversion obtains sampled voltage by sampling resistor, gives the I/O mouth of ADC (i.e. analog-digital chip) after being amplified by sampled voltage signal thereupon.
Described ADC sampling module 60 comprises analog-digital chip (ADC), for the simulating signal collected is converted to digital signal.In other examples, described ADC sampling module is set to the ADC sampling unit of STM32 single-chip microcomputer inside, and the ADC interface of STM32 single-chip microcomputer is connected with described discharge circuit.
Because ADC can only gather the magnitude of voltage of positive quadrant, and the AC signal of input is the sine wave of a positive and negative quadrant, so in described Signal-regulated kinase 50, in order to allow ADC collect the value of a whole ripple thus to increase bias voltage REFO, make sine wave signal at positive quadrant.Such ADC accurately could sample voltage signal.The bias voltage that we give for this reason is 1.65V, supplies by Switching Power Supply.
The announcement of book and instruction according to the above description, the utility model those skilled in the art can also change above-mentioned embodiment and revise.Therefore, the utility model is not limited to embodiment disclosed and described above, also should fall in the protection domain of claim of the present utility model modifications and changes more of the present utility model.In addition, although employ some specific terms in this instructions, these terms just for convenience of description, do not form any restriction to the utility model.
Claims (7)
1. a three-phase current sample circuit, is characterized in that: comprise the current transformer module, circuit protection module, Signal-regulated kinase and the ADC sampling module that connect successively; Also comprise a mutual inductor plate and a CPU board, described current transformer module and circuit protection module are located on mutual inductor plate, and described Signal-regulated kinase and ADC sampling module are located in CPU board;
Described Current Mutual Inductance module comprises multiple current transformer; Described Signal-regulated kinase comprises stabilized voltage supply and discharge circuit, and described stabilized voltage supply is connected with discharge circuit, and stabilized voltage supply provides DC offset voltage for discharge circuit; Described discharge circuit is used for amplified current signal, and the input end of discharge circuit is connected with described current transformer, and the output terminal of discharge circuit is connected with ADC sampling module.
2. three-phase current sample circuit according to claim 1, it is characterized in that: described circuit protection module comprises multiple Transient Suppression Diode, described Transient Suppression Diode is connected with described current transformer.
3. three-phase current sample circuit according to claim 1, is characterized in that: described current transformer is straight-through current transformer.
4. three-phase current sample circuit according to claim 1, is characterized in that: described ADC sampling module is the ADC sampling unit being integrated in STM32 single-chip microcomputer inside, and the ADC interface of described STM32 single-chip microcomputer is connected with described discharge circuit.
5. three-phase current sample circuit according to claim 1, is characterized in that: described ADC sampling module comprises analog-digital chip.
6. three-phase current sample circuit according to claim 1, is characterized in that: described discharge circuit comprises operational amplifier.
7. three-phase current sample circuit according to claim 1, is characterized in that: the bias voltage that described stabilized voltage supply provides is 1.65V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420775134.6U CN204287311U (en) | 2014-12-09 | 2014-12-09 | A kind of three-phase current sample circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420775134.6U CN204287311U (en) | 2014-12-09 | 2014-12-09 | A kind of three-phase current sample circuit |
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| Publication Number | Publication Date |
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| CN204287311U true CN204287311U (en) | 2015-04-22 |
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| CN201420775134.6U Active CN204287311U (en) | 2014-12-09 | 2014-12-09 | A kind of three-phase current sample circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510677A (en) * | 2016-01-15 | 2016-04-20 | 中国船舶重工集团公司第七一一研究所 | Universal three-phase electricity collecting equipment and system |
| CN107656086A (en) * | 2017-08-31 | 2018-02-02 | 深圳中广核工程设计有限公司 | A kind of nuclear power station main pump tach signal monitoring system and method |
| CN110286259A (en) * | 2019-07-12 | 2019-09-27 | 浙江匠联科技有限公司 | A kind of current peak detection circuit |
-
2014
- 2014-12-09 CN CN201420775134.6U patent/CN204287311U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510677A (en) * | 2016-01-15 | 2016-04-20 | 中国船舶重工集团公司第七一一研究所 | Universal three-phase electricity collecting equipment and system |
| CN107656086A (en) * | 2017-08-31 | 2018-02-02 | 深圳中广核工程设计有限公司 | A kind of nuclear power station main pump tach signal monitoring system and method |
| CN107656086B (en) * | 2017-08-31 | 2020-05-15 | 深圳中广核工程设计有限公司 | Nuclear power station main pump rotating speed signal monitoring system and method |
| CN110286259A (en) * | 2019-07-12 | 2019-09-27 | 浙江匠联科技有限公司 | A kind of current peak detection circuit |
| CN110286259B (en) * | 2019-07-12 | 2021-10-08 | 浙江匠联科技有限公司 | Current peak value detection circuit |
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| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 512000 Guangdong city of Guangzhou Province on Guangzhou high tech Industrial Development Zone, Road No. 8, 212, 216, 218 Patentee after: Guangdong Polytron Technologies Inc Address before: On the road of Guangzhou high tech Development Zone of Guangdong Province, No. 8, 212, 512000, 216 and 218 Patentee before: GUANGZHOU LI TIAN ELECTRICAL TECHNOLOGY CO., LTD. |