CN212341306U - Voltage sensor - Google Patents
Voltage sensor Download PDFInfo
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- CN212341306U CN212341306U CN202020937325.3U CN202020937325U CN212341306U CN 212341306 U CN212341306 U CN 212341306U CN 202020937325 U CN202020937325 U CN 202020937325U CN 212341306 U CN212341306 U CN 212341306U
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Abstract
The utility model relates to a sensor field, aim at provides a voltage sensor with the precision is high, the error is little, measuring voltage level is high, linear measurement scope is wide. The technical scheme is as follows: the utility model provides a voltage sensor, includes sampling unit, isolation unit, falls the amplification unit and the power conversion unit of making an uproar, the output of sampling unit links to each other with isolation unit input, the output of isolation unit links to each other with the input of the amplification unit of making an uproar that falls, fall the amplification unit of making an uproar including being used for carrying out the full difference circuit of making an uproar that falls of the signal of isolation unit output to and the amplifier circuit who carries out the amplification processing with falling the circuit output value of making an uproar, the output of power conversion unit links to each other with the power end of isolation unit and the circuit of making an upr.
Description
Technical Field
The utility model relates to a sensor field, concretely relates to voltage sensor.
Background
The voltage sensor has various voltage detection modes, and the sensor which adopts the electromagnetic induction principle and is externally added with excitation power supply oscillation can test both alternating current and direct current drain voltage, but the circuit is relatively complex and the debugging difficulty is high. The alternating current leakage voltage is measured by directly utilizing the transformer principle, however, output signals are not transmitted generally, and the difficulty of rear-end signal acquisition and processing is increased.
Disclosure of Invention
An object of the utility model is to provide a voltage sensor that has that the precision is high, the error is little, the measurement voltage level is high, the linear measurement scope is wide.
In order to realize the purpose of the utility model, the utility model adopts the technical proposal that: the utility model provides a voltage sensor, includes sampling unit, isolation unit, falls the amplification unit and the power conversion unit of making an uproar, the output of sampling unit links to each other with isolation unit input, the output of isolation unit links to each other with the input of the amplification unit of making an uproar that falls, fall the amplification unit of making an uproar including being used for carrying out the full difference circuit of making an uproar that falls of the signal of isolation unit output to and the amplifier circuit who carries out the amplification processing with falling the circuit output value of making an uproar, the output of power conversion unit links to each other with the power end of isolation unit and the circuit of making an upr.
Preferably, the power conversion unit includes a first DC-DC conversion circuit, a power isolation circuit, and a second DC-DC conversion circuit, an output end of the first DC-DC conversion circuit is connected to the power isolation circuit, an output end of the power isolation circuit is connected to a power end of the isolation unit, and the second DC-DC conversion circuit is connected to a power end of the noise reduction circuit.
Preferably, the noise reduction circuit includes a first operational amplifier, a ninth resistor, a thirteenth resistor, an eighteenth resistor, a nineteenth resistor, and a tenth capacitor, wherein a homodromous input terminal of the first operational amplifier is connected to first ends of the ninth resistor and the thirteenth resistor, two ends of the tenth capacitor are connected to second ends of the ninth resistor and the thirteenth resistor, respectively, an inverting input terminal of the first operational amplifier is connected to first ends of the eighteenth resistor and the nineteenth resistor, respectively, a second end of the nineteenth resistor is connected to an output terminal of the first operational amplifier, and second ends of the ninth resistor and the eighteenth resistor are input terminals of the noise reduction circuit;
the amplifying circuit comprises a second operational amplifier, a tenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor and a seventeenth resistor, wherein the homodromous input end of the second operational amplifier is connected with the first end of the tenth resistor, the second end of the tenth resistor is connected with the output end of the first operational amplifier, the inverting input end of the second operational amplifier is respectively connected with the first ends of the seventeenth resistor and the fourteenth resistor, the second end of the fourteenth resistor is connected with the first end of the fifteenth resistor, the second end of the fifteenth resistor is connected with the first end of the sixteenth resistor, and the second end of the sixteenth resistor is connected with the output end of the second operational amplifier;
and second ends of the thirteenth resistor and the seventeenth resistor are both grounded.
Preferably, an interface circuit is connected to an output end of the second operational amplifier, and the interface circuit includes an output interface and a power supply interface.
Preferably, the sampling unit is a resistor network voltage division sampling.
The beneficial effects of the utility model are concentrated and are embodied in: the utility model discloses a voltage sensor has that the precision is high, the error is little, measuring voltage level is high, linear measurement range advantage such as wide, specifically: an isolation unit is arranged between the sampling unit and the noise reduction amplification unit, and is used for isolating the high voltage input by the sampling unit from the low voltage output by the noise reduction circuit, so that the output signal of the noise reduction circuit at the rear stage is prevented from being influenced by the input signal at the front stage, and the measurement precision of the circuit is improved;
meanwhile, the fully differential signals output by the isolation unit are subjected to differential calculation processing of the noise reduction circuit, so that the influence of common-mode signals is suppressed to the maximum extent, noise is eliminated, and the measurement accuracy of the sensor is further improved;
secondly, the measurement error that the fluctuation that can effectively avoid the power of setting up of isolation power brought, on the other hand sampling circuit adopts resistance network partial pressure sampling, makes the utility model discloses the circuit is simpler, the volume is littleer, weight is lighter, the temperature floats lower.
Drawings
FIG. 1 is a block diagram of the overall circuit of the present invention;
fig. 2 is a first DC-DC conversion circuit diagram of the present invention;
fig. 3 is a second DC-DC conversion circuit diagram of the present invention;
fig. 4 is a power isolation circuit diagram of the present invention;
fig. 5 is a circuit diagram of the sampling unit and the isolation unit of the present invention;
FIG. 6 is a circuit diagram of the noise reduction amplifying unit of the present invention;
fig. 7 is a circuit diagram of the interface circuit of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-7, a voltage sensor includes a sampling unit, an isolation unit, a noise reduction amplification unit and a power conversion unit, wherein the circuits in the voltage sensor are all integrated on the same circuit board, the integration level is high, the volume of the sensor is small, and in this embodiment, the isolation unit directly adopts an AMC1200 isolation chip U3, the output terminal of the sampling unit is connected with the input terminal of the isolation unit, the output terminal of the isolation unit is connected with the input terminal of the noise reduction amplification unit, the noise reduction amplification unit includes a noise reduction circuit for fully differentially processing the signal output by the isolation unit and an amplification circuit for amplifying the output value of the noise reduction circuit, the output terminal of the power conversion unit is connected with the power terminals of the isolation unit and the noise reduction circuit respectively, and the noise reduction circuit can maximally suppress the common mode signal in the circuit, the detection precision of the circuit can be improved.
Further, the power conversion unit comprises a first DC-DC conversion circuit, a power isolation circuit and a second DC-DC conversion circuit, wherein an output end of the first DC-DC conversion circuit is connected with the power isolation circuit, an output end of the power isolation circuit is connected with a power end of the isolation unit, and the second DC-DC conversion circuit is connected with a power end of the noise reduction circuit;
as shown in fig. 2, in the present embodiment, the first DC-DC conversion circuit includes a DC buck conversion chip U1 with MP2359 signal and its peripheral circuit, the input voltage of the chip is +15V, the output voltage is 5V, and the chip has the advantages of high output precision and strong stability, and its peripheral circuit includes a first capacitor C1, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a first inductor L1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a first schottky diode D1.
As shown in fig. 3, the second DC-DC conversion circuit may convert the +15 voltage into a-15V voltage in order to provide a negative voltage for the noise reduction circuit, and includes the conversion chip U5 and its peripheral circuits including a twelfth capacitor C12, a thirteenth capacitor C13 and a fourteenth capacitor C14.
As shown in fig. 4, the power isolation circuit includes an isolation chip U2 with a model of ADU6028 and its peripheral circuit, where the peripheral circuit includes an eighth capacitor C8 and a seventh capacitor C7, the +5V output terminal of the MP2359 dc buck conversion chip U1 is used as the input of the ADU6028 isolation chip U2, and outputs a stable +5V voltage to be supplied to the isolation unit as the input voltage, and the ADU6028 isolation chip U2 can avoid the power fluctuation from causing the measurement error of the sensor.
Further, as shown in fig. 5, the sampling unit is a resistor network voltage-dividing sampling unit, and specifically includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, an eleventh resistor R11 and a twelfth resistor R12, where the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the eleventh resistor R11 and the twelfth resistor R12 are sequentially connected in series, the unconnected end of the sixth resistor R6 and the eleventh resistor R11 is respectively used as Vi +, Vi-input ends of samples, both ends of the eighth resistor are used as input ends of the isolation unit, the end of the eighth resistor R8 connected to the seventh resistor R7 is connected to the pin 2 of the chip U3, the end of the eighth resistor R8 connected to the twelfth resistor R12 is connected to the pin 3 of the chip U3, the pins 7 and 6 of the chip U3 are respectively used as differential signals + Vout and Vout-output, and voltage-dividing is adopted in this embodiment, so that the sampling circuit of the present invention is simpler and the present invention is applied to divide voltage-dividing sampling circuit Smaller volume, lighter weight and lower temperature drift.
Further, as shown in fig. 6, the noise reduction circuit includes a first operational amplifier U4A, a ninth resistor R9, a thirteenth resistor R13, an eighteenth resistor R18, a nineteenth resistor R19 and a tenth capacitor C10, the same-direction input terminal of the first operational amplifier U4A is connected to the first ends of the ninth resistor R9 and the thirteenth resistor R13, two ends of the tenth capacitor C10 are connected to the second ends of the ninth resistor R9 and the thirteenth resistor R13, the opposite-direction input terminal of the first operational amplifier U4A is connected to the first ends of the eighteenth resistor R18 and the nineteenth resistor R19, the second end of the nineteenth resistor R19 is connected to the output terminal of the first operational amplifier U4A, the second ends of the ninth resistor R9 and the eighteenth resistor R18 are both input terminals of differential signals of the noise reduction circuit, that is, the eighteenth resistor R585 and the eighteenth resistor R18 are connected to the pin 5737 of the chip U24, 6 are connected; in the embodiment, the AMC1200 isolation chip U3 isolates the high voltage input by Vi + and Vi-from the low voltage output by the noise reduction circuit, so that the influence of the front-stage circuit on the precision of the rear-stage circuit can be avoided; the input direct current high voltage is changed into low voltage through a voltage division network of the resistor and then processed, a fully differential signal is output, and the fully differential signal is subjected to differential processing through the noise reduction circuit, so that the influence of a common mode signal is suppressed to the maximum extent, the noise of the detection output of the sensor is eliminated, and the detection precision is further improved.
The amplifying circuit comprises a second operational amplifier U4B, a tenth resistor R10, a fourteenth resistor 14, a fifteenth resistor 15, a sixteenth resistor 16 and a seventeenth resistor 17, wherein the same-direction input end of the second operational amplifier U4B is connected with the first end of the tenth resistor R10, the second end of the tenth resistor R10 is connected with the output end of the first operational amplifier U4A, the reverse-direction input end of the second operational amplifier U4B is respectively connected with the first ends of the seventeenth resistor 17 and the fourteenth resistor 14, the second end of the fourteenth resistor 14 is connected with the first end of the fifteenth resistor 15, the second end of the fifteenth resistor 15 is connected with the first end of the sixteenth resistor 16, and the second end of the sixteenth resistor 16 is connected with the output end of the second operational amplifier U4B;
second ends of the thirteenth resistor R13 and the seventeenth resistor 17 are both grounded, positive and negative voltage input ends of the first operational amplifier U4A are respectively connected with a ninth capacitor 9 and an eleventh capacitor 11, and the other ends of the ninth capacitor 9 and the eleventh capacitor 11 are both grounded.
Further, as shown in fig. 7, an output end of the second operational amplifier U4B is connected to an interface circuit, the interface circuit includes an output interface and a power interface, the power interface includes a +15V power supply and a ground interface, the +15V power supply interface is connected to a first resistor R1, a second end of the first resistor R1 and the ground interface are connected to each other via a second capacitor 2 and a third capacitor 3, which are connected in parallel, and a second end of the first resistor R1 is an input end of the power conversion unit and is also provided with a sampling input interface.
It should be noted that, for simplicity of description, the above-mentioned embodiments of the method are described as a series of acts or combinations, but those skilled in the art should understand that the present application is not limited by the order of acts described, as some steps may be performed in other orders or simultaneously according to the present application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and elements referred to are not necessarily required in this application.
Claims (5)
1. A voltage sensor, characterized by: including sampling unit, isolation unit, the amplification unit and the power conversion unit of making an uproar fall, the output of sampling unit links to each other with isolation unit input, the output of isolation unit links to each other with the input of the amplification unit of making an uproar falls, fall the amplification unit of making an uproar including being used for carrying out the circuit of making an uproar that falls of full differential processing with the signal of isolation unit output to and the amplifier circuit who carries out the amplification processing with circuit output value of making an uproar falls, the output of power conversion unit links to each other with the power end of isolation unit and the circuit of making an uproar respectively.
2. A voltage sensor according to claim 1, wherein: the power conversion unit comprises a first DC-DC conversion circuit, a power isolation circuit and a second DC-DC conversion circuit, wherein the output end of the first DC-DC conversion circuit is connected with the power isolation circuit, the output end of the power isolation circuit is connected with the power end of the isolation unit, and the second DC-DC conversion circuit is connected with the power end of the noise reduction circuit.
3. A voltage sensor according to claim 2, wherein: the noise reduction circuit comprises a first operational amplifier, a ninth resistor, a thirteenth resistor, an eighteenth resistor, a nineteenth resistor and a tenth capacitor, wherein the homodromous input end of the first operational amplifier is respectively connected with the first ends of the ninth resistor and the thirteenth resistor, the two ends of the tenth capacitor are respectively connected with the second ends of the ninth resistor and the thirteenth resistor, the reverse input end of the first operational amplifier is respectively connected with the first ends of the eighteenth resistor and the nineteenth resistor, the second end of the nineteenth resistor is connected with the output end of the first operational amplifier, and the second ends of the ninth resistor and the eighteenth resistor are both input ends of the noise reduction circuit;
the amplifying circuit comprises a second operational amplifier, a tenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor and a seventeenth resistor, wherein the homodromous input end of the second operational amplifier is connected with the first end of the tenth resistor, the second end of the tenth resistor is connected with the output end of the first operational amplifier, the inverting input end of the second operational amplifier is respectively connected with the first ends of the seventeenth resistor and the fourteenth resistor, the second end of the fourteenth resistor is connected with the first end of the fifteenth resistor, the second end of the fifteenth resistor is connected with the first end of the sixteenth resistor, and the second end of the sixteenth resistor is connected with the output end of the second operational amplifier;
and second ends of the thirteenth resistor and the seventeenth resistor are both grounded.
4. A voltage sensor according to claim 3, wherein: the output end of the second operational amplifier is connected with an interface circuit, and the interface circuit comprises an output interface and a power supply interface.
5. A voltage sensor according to claim 1, wherein: the sampling unit is used for voltage division sampling of a resistance network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020937325.3U CN212341306U (en) | 2020-05-28 | 2020-05-28 | Voltage sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020937325.3U CN212341306U (en) | 2020-05-28 | 2020-05-28 | Voltage sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212341306U true CN212341306U (en) | 2021-01-12 |
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ID=74076227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020937325.3U Active CN212341306U (en) | 2020-05-28 | 2020-05-28 | Voltage sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212341306U (en) |
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2020
- 2020-05-28 CN CN202020937325.3U patent/CN212341306U/en active Active
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