CN204287312U - A kind of three-phase voltage sample circuit - Google Patents
A kind of three-phase voltage sample circuit Download PDFInfo
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- CN204287312U CN204287312U CN201420775144.XU CN201420775144U CN204287312U CN 204287312 U CN204287312 U CN 204287312U CN 201420775144 U CN201420775144 U CN 201420775144U CN 204287312 U CN204287312 U CN 204287312U
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Abstract
The utility model discloses a kind of three-phase voltage sample circuit, comprise the electric resistance partial pressure module be connected with three-phase voltage, and with the Signal-regulated kinase of electric resistance partial pressure model calling and signal processing module; Described electric resistance partial pressure module and Signal-regulated kinase are located on voltage acquisition plate, and described signal processing module is located on MCU plate; Described electric resistance partial pressure module comprises the resistance in series that polycomponent is not connected with three-phase voltage; Described Signal-regulated kinase comprises stabilized voltage supply, the multiple divider resistance be connected with stabilized voltage supply and operational amplifier, each divider resistance is connected mutually, described operational amplifier is connected with divider resistance, and the output terminal of operational amplifier is connected with the end of described resistance in series; Described signal processing module comprises ADC sampling unit, and ADC sampling unit is connected with described resistance in series.The utility model three-phase voltage sample circuit, improve antijamming capability and circuit stability, and portability also has greatly improved.
Description
Technical field
The utility model belongs to circuit engineering field, is specifically related to a kind of three-phase voltage sample circuit.
Background technology
Often need in current electric system to measure phase voltage or line voltage, the calculating of voltage to the quality of power supply and the maintenance to grid equipment have great significance.In electric system, general voltage access way is divided into three-phase three-wire system and three-phase four-wire system two kinds, and the connection of three-phase three-wire system is not owing to having neutral point, therefore phase voltage is nonsensical, can only obtain line voltage, and three-phase four-wire system can accurately obtain phase voltage and phase voltage.
Voltage acquisition technology of the prior art, usually utilize mutual inductor that the voltage signal of conversion is transferred to electric energy computation chip, there is following shortcoming in such circuit: 1. owing to adopting mutual inductor step-down, will be especially high to the requirement of mutual inductor, the selection of mutual inductor model directly can affect sampled signal, cause sampling inaccurate; 2. the compatibility of electric energy computation chip is weak, and the later stage can only to upgrade Circuits System by changing chip, and cost is high and inconvenient; 3. the voltage collection circuit that forms of voltage transformer (VT) and electric energy computation chip, function singleness, can only be used in electric energy detection, and portability is not strong.
Utility model content
The purpose of this utility model is the problem for solving above-mentioned prior art, thus designs a kind of three-phase voltage sample circuit, have that circuit compatibility is good, plate portable strong, install safe, easy to maintenance, error is controlled and the feature that cost is low.
The technical scheme adopted for realizing the utility model object is: a kind of three-phase voltage sample circuit, comprises the electric resistance partial pressure module be connected with three-phase voltage, and with the Signal-regulated kinase of electric resistance partial pressure model calling and signal processing module; Also comprise a voltage acquisition plate and a MCU plate, described electric resistance partial pressure module and Signal-regulated kinase are located on voltage acquisition plate, and described signal processing module is located on MCU plate; Described electric resistance partial pressure module comprises the resistance in series that polycomponent is not connected with three-phase voltage, often organizes resistance in series and is mutually composed in series by multiple resistance; Described Signal-regulated kinase comprises stabilized voltage supply, the multiple divider resistance be connected with stabilized voltage supply and operational amplifier, each divider resistance is connected mutually, described operational amplifier is connected with divider resistance, and the output terminal of operational amplifier is connected with the end of described resistance in series; Described signal processing module comprises ADC sampling unit, and ADC sampling unit is connected with described resistance in series.
Preferably, the voltage that stabilized voltage supply provides by described operational amplifier to supply the end of described resistance in series after the scale smaller of 1/2nd, as the reference voltage of resistance in series end.
Preferably, the voltage of described stabilized voltage supply is 3.3V, and the reference voltage that described operational amplifier is supplied to resistance in series end is 1.65V.
Preferably, described stabilized voltage supply is set to the voltage stabilizing chip that model is LM1117.
Preferably, described ADC sampling unit is the ADC sampling unit being integrated in STM32 single-chip microcomputer inside, the ADC interface of described STM32 single-chip microcomputer and described electric resistance partial pressure model calling.
Preferably, described ADC sampling unit comprises analog-digital chip.
Three-phase voltage sample circuit of the present utility model has following beneficial effect relative to prior art: 1) civil power equal proportion directly can be changed into the voltage can sampled to ADC by electric resistance partial pressure, and circuit is simple, and antijamming capability is strong and cost is low; 2) modulate circuit adopts switching power supply to provide reference voltage, and Switching Power Supply stability is strong, thus makes sampled signal more accurate; 3) signal processing circuit adopts STM32 single-chip microcomputer to carry out sampling and calculating, entire system, by the analog voltage signal recorded is converted to digital signal, precision is higher, and convenient compensation deals measurement result being done to the later stage, make error drop to controlled range, thus make whole system obtain development steady in a long-term; 4) solve the defect that existing voltage collection circuit step-down part mutual inductor type selecting is difficult, error is large, its type selecting of the utility model is easy, error is controlled and cost is low.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model three-phase voltage sample circuit
Fig. 2 is the circuit diagram of the utility model three-phase voltage sample circuit
Embodiment
Below in conjunction with accompanying drawing, specific embodiment of the utility model is described further:
As shown in Figure 1, a kind of three-phase voltage sample circuit of the present embodiment, comprises electric resistance partial pressure module 50, Signal-regulated kinase 60 and signal processing module 40; Electric resistance partial pressure module 50 and Signal-regulated kinase 60 arrange on voltage acquisition plate 10, and signal processing module 40 is then arranged on MCU plate 20 (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 processing module relatively high for the requirement to working environment 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, in dotted line frame, indicated above-mentioned electric resistance partial pressure module 50, Signal-regulated kinase 60 and signal processing module 40 respectively.
Input end UA, UB, UC of described electric resistance partial pressure module 50 directly connect three-phase voltage to be measured, are respectively equipped with the resistance in series of each phase voltage of some connections after input end.Wherein, the resistance connecting first-phase voltage comprises R19, R20, R21, R22, R18, R17 and R16, and R19, R20, R21, R22, R18, R17 and R16 are sequentially connected in series; The resistance connecting second-phase voltage comprises R26, R27, R28, R29, R25, R24 and R23, and R26, R27, R28, R29, R25, R24 and R23 are sequentially connected in series; The resistance connecting third phase voltage comprises R33, R34, R35, R36, R32, R31 and R30, and R33, R34, R35, R36, R32, R31 and R30 are sequentially connected in series.
The operational amplifier that described Signal-regulated kinase 60 comprises stabilized voltage supply VCC, divider resistance R38 with R37, is connected with divider resistance, the output terminal 7 of amplifier connects the end of described electric resistance partial pressure module 50, is namely connected with R16, R23, R30 of each phase voltage end respectively; Amplifier with 1/2nd the 3.3V voltage that provides of scale smaller stabilized voltage supply, thus provide the reference voltage of 1.65V for the end of electric resistance partial pressure module, namely REFO is 1.65V.The voltage stabilizing chip that described stabilized voltage supply is LM1117 by model provides.
Described signal processing module 40 comprises ADC sampling unit, and ADC sampling unit comprises the port with at least 3 I/O input ports, connects described electric resistance partial pressure module respectively, for gathering information of voltage.As shown in Figure 2, port one is connected between divider resistance R22 and R18 of first-phase voltage, and port 2 is connected between divider resistance R29 and R25 of second-phase voltage, and port 3 is connected between divider resistance R36 and R32 of third phase voltage.
Described ADC sampling unit comprises analog-digital chip (ADC), or is set to the ADC sampling unit being integrated in STM32 single-chip microcomputer inside in other embodiments.By the analog voltage signal recorded is converted to digital signal, to facilitate compensation deals measurement result being done to the later stage, make error drop to controlled range, thus make whole system obtain development steady in a long-term.
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 (6)
1. a three-phase voltage sample circuit, is characterized in that: comprise the electric resistance partial pressure module be connected with three-phase voltage, and with the Signal-regulated kinase of electric resistance partial pressure model calling and signal processing module; Also comprise a voltage acquisition plate and a MCU plate, described electric resistance partial pressure module and Signal-regulated kinase are located on voltage acquisition plate, and described signal processing module is located on MCU plate;
Described electric resistance partial pressure module comprises the resistance in series that polycomponent is not connected with three-phase voltage, often organizes resistance in series and is mutually composed in series by multiple resistance; Described Signal-regulated kinase comprises stabilized voltage supply, the multiple divider resistance be connected with stabilized voltage supply and operational amplifier, each divider resistance is connected mutually, described operational amplifier is connected with divider resistance, and the output terminal of operational amplifier is connected with the end of described resistance in series; Described signal processing module comprises ADC sampling unit, and ADC sampling unit is connected with described resistance in series.
2. three-phase voltage sample circuit according to claim 1, is characterized in that: the voltage that stabilized voltage supply provides by described operational amplifier to supply the end of described resistance in series after the scale smaller of 1/2nd, as the reference voltage of resistance in series end.
3. three-phase voltage sample circuit according to claim 2, is characterized in that: the voltage of described stabilized voltage supply is 3.3V, and the reference voltage that described operational amplifier is supplied to resistance in series end is 1.65V.
4. three-phase voltage sample circuit according to claim 1, is characterized in that: described stabilized voltage supply is set to the voltage stabilizing chip that model is LM1117.
5. three-phase voltage sample circuit according to claim 1, is characterized in that: described ADC sampling unit is the ADC sampling unit being integrated in STM32 single-chip microcomputer inside, the ADC interface of described STM32 single-chip microcomputer and described electric resistance partial pressure model calling.
6. three-phase voltage sample circuit according to claim 1, is characterized in that: described ADC sampling unit comprises analog-digital chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420775144.XU CN204287312U (en) | 2014-12-09 | 2014-12-09 | A kind of three-phase voltage sample circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420775144.XU CN204287312U (en) | 2014-12-09 | 2014-12-09 | A kind of three-phase voltage sample circuit |
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| Publication Number | Publication Date |
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| CN204287312U true CN204287312U (en) | 2015-04-22 |
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| CN201420775144.XU Active CN204287312U (en) | 2014-12-09 | 2014-12-09 | A kind of three-phase voltage sample circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109596881A (en) * | 2018-12-07 | 2019-04-09 | 浙江正泰仪器仪表有限责任公司 | A kind of alternating voltage sampling circuit and system |
| CN111323641A (en) * | 2020-03-10 | 2020-06-23 | 南京日新科技有限公司 | Current and voltage sampling circuit |
-
2014
- 2014-12-09 CN CN201420775144.XU patent/CN204287312U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109596881A (en) * | 2018-12-07 | 2019-04-09 | 浙江正泰仪器仪表有限责任公司 | A kind of alternating voltage sampling circuit and system |
| CN111323641A (en) * | 2020-03-10 | 2020-06-23 | 南京日新科技有限公司 | Current and voltage sampling circuit |
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| GR01 | Patent grant | ||
| 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. |