CN210465529U - Three-phase alternating voltage acquisition circuit - Google Patents
Three-phase alternating voltage acquisition circuit Download PDFInfo
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- CN210465529U CN210465529U CN201921066225.1U CN201921066225U CN210465529U CN 210465529 U CN210465529 U CN 210465529U CN 201921066225 U CN201921066225 U CN 201921066225U CN 210465529 U CN210465529 U CN 210465529U
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Abstract
The utility model relates to a three-phase alternating voltage acquisition circuit, which comprises an A alternating voltage input end, a B alternating voltage input end and a C alternating voltage input end; the A alternating current voltage input end is connected to the inverting input end of a first operational amplifier through a group of first resistors connected in series, and the non-inverting input end of the first operational amplifier is connected to a voltage division point of a voltage division circuit; a first feedback resistor is connected between the inverting input end and the output end of the first operational amplifier; and the output end of the first operational amplifier is connected with the AB line voltage sampling output end through a filter circuit. The utility model discloses under the condition of realization function, simplified the structure greatly, the cost is reduced.
Description
Technical Field
The utility model relates to a three-phase alternating voltage acquisition circuit.
Background
For industrial three-phase alternating-current voltage, a voltage transformer is generally required to be sampled during sampling, and the cost of the voltage transformer is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a three-phase alternating voltage acquisition circuit for solve the problem that prior art is with high costs.
The scheme of the utility model includes:
a three-phase alternating voltage acquisition circuit comprises an A alternating voltage input end, a B alternating voltage input end and a C alternating voltage input end; the A alternating current voltage input end is connected to the inverting input end of a first operational amplifier through a group of first resistors connected in series, and the non-inverting input end of the first operational amplifier is connected to a voltage division point of a voltage division circuit; a first feedback resistor is connected between the inverting input end and the output end of the first operational amplifier;
the voltage division circuit comprises a group of second resistors connected in series, one end of the voltage division circuit is connected with a B alternating current voltage input end, and the other end of the voltage division circuit is connected with a reference voltage;
the input end of the C alternating current voltage is connected to the inverting input end of a second operational amplifier through a group of third resistors connected in series, and the non-inverting input end of the second operational amplifier is connected to a voltage division point of the voltage division circuit; a second feedback resistor is connected between the inverting input end and the output end of the second operational amplifier;
the output end of the first operational amplifier is connected with the AB line voltage sampling output end through a filter circuit; and the output end of the second operational amplifier is connected with the CB line voltage sampling output end through a filter circuit.
Further, the total resistance value of the first resistors connected in series is 1080KΩ; the first feedback resistor is 2K omega.
Further, the total resistance value of the group of serially connected second resistors is 1080KΩ; the first feedback resistor is 2K omega.
Further, the resistance values at two ends of the voltage division point are 1080K Ω and 2K Ω respectively.
Further, the filter circuit is an RC filter circuit.
The beneficial effects of the utility model include: the industrial alternating voltage (such as 380V) is directly acquired through the operational amplifier and the resistor network, the voltage entering the operational amplifier and the current flowing into the circuit board are proper in magnitude by utilizing the high input impedance of the operational amplifier and the externally increased large divider resistor, the structure is greatly simplified under the condition of realizing the function, and the cost is reduced.
Drawings
Fig. 1 is a circuit schematic of an embodiment.
FIG. 2 is a schematic diagram of a CB line voltage acquisition circuit in an embodiment.
Detailed Description
The following description is made with reference to the accompanying drawings.
Examples
A three-phase ac voltage collecting circuit as shown in fig. 1 and 2, comprising an a-phase ac voltage input U A, a B-phase ac voltage input UB and a C-phase ac voltage input UC; the A alternating current voltage input end is connected to the inverting input end of a first operational amplifier U3C through a series connection of first resistors RUA1, RUA2 and RUA3, and the non-inverting input end of the first operational amplifier is connected to a voltage division point V + of a voltage division circuit; and a first feedback resistor R31 is connected between the inverting input end and the output end of the first operational amplifier.
The voltage dividing circuit comprises a group of second resistors RUB1, RUB2, RUB3 and R35 which are connected in series, one end of the voltage dividing circuit is connected with a B alternating current voltage input end UB, and the other end of the voltage dividing circuit is connected with a reference voltage REF, wherein REF can be selected to be 1.5V, for example.
The C alternating current voltage input end UC is connected to the inverting input end of a second operational amplifier U3D through a group of third resistors RUC1, RUC2 and RUC3 which are connected in series, and the non-inverting input end of the second operational amplifier is connected to the voltage dividing point V + of the voltage dividing circuit; a second feedback resistor R32 is connected between the inverting input end and the output end of the second operational amplifier;
the output end of the first operational amplifier U3C is connected with an AB line voltage sampling output end AD _ UA through a filter circuit; and the output end of the second operational amplifier is connected with a CB line voltage sampling output end AD _ UC through a filter circuit.
The first and second operational amplifiers may employ TLC 2264.
Specifically, the circuit device model selection comprises: the total resistance value of the first resistors connected in series is 1080 Komega; the first feedback resistor R31 is 2K Ω. The total resistance value of the second resistors connected in series is 1080 Komega; the first feedback resistor R32 is 2K Ω. The resistance values at the two ends of the voltage division point V + are 1080K omega and 2K omega respectively.
The filter circuit is an RC filter circuit, for example, R33 is connected to C19, and filters the output of the first operational amplifier. As other embodiments, other types of filter circuits may be employed.
The above is a preferred embodiment of the present invention, but it should be understood that the above detailed description should not be construed as limiting the spirit and scope of the present invention, and obvious modifications or substitutions made by those skilled in the art based on the above embodiment still belong to the protection scope of the present invention.
Claims (5)
1. A three-phase alternating voltage acquisition circuit is characterized by comprising an A alternating voltage input end, a B alternating voltage input end and a C alternating voltage input end; the A alternating current voltage input end is connected to the inverting input end of a first operational amplifier through a group of first resistors connected in series, and the non-inverting input end of the first operational amplifier is connected to a voltage division point of a voltage division circuit; a first feedback resistor is connected between the inverting input end and the output end of the first operational amplifier;
the voltage division circuit comprises a group of second resistors connected in series, one end of the voltage division circuit is connected with a B alternating current voltage input end, and the other end of the voltage division circuit is connected with a reference voltage;
the input end of the C alternating current voltage is connected to the inverting input end of a second operational amplifier through a group of third resistors connected in series, and the non-inverting input end of the second operational amplifier is connected to a voltage division point of the voltage division circuit; a second feedback resistor is connected between the inverting input end and the output end of the second operational amplifier;
the output end of the first operational amplifier is connected with the AB line voltage sampling output end through a filter circuit; and the output end of the second operational amplifier is connected with the CB line voltage sampling output end through a filter circuit.
2. A three-phase alternating voltage acquisition circuit according to claim 1, wherein the total resistance of the series-connected first resistors is 1080K Ω; the first feedback resistor is 2K omega.
3. The three-phase alternating voltage acquisition circuit according to claim 1, wherein the total resistance value of the series-connected second resistors is 1080K Ω; the first feedback resistor is 2K omega.
4. The three-phase alternating voltage acquisition circuit according to claim 1, wherein resistance values at both ends of the voltage division point are 1080K Ω and 2K Ω, respectively.
5. A three-phase alternating voltage acquisition circuit according to claim 1, characterized in that said filter circuit is an RC filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921066225.1U CN210465529U (en) | 2019-07-09 | 2019-07-09 | Three-phase alternating voltage acquisition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921066225.1U CN210465529U (en) | 2019-07-09 | 2019-07-09 | Three-phase alternating voltage acquisition circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210465529U true CN210465529U (en) | 2020-05-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921066225.1U Active CN210465529U (en) | 2019-07-09 | 2019-07-09 | Three-phase alternating voltage acquisition circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210465529U (en) |
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2019
- 2019-07-09 CN CN201921066225.1U patent/CN210465529U/en active Active
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