CN202886461U - An AC voltage detecting device - Google Patents
An AC voltage detecting device Download PDFInfo
- Publication number
- CN202886461U CN202886461U CN 201220492195 CN201220492195U CN202886461U CN 202886461 U CN202886461 U CN 202886461U CN 201220492195 CN201220492195 CN 201220492195 CN 201220492195 U CN201220492195 U CN 201220492195U CN 202886461 U CN202886461 U CN 202886461U
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- voltage
- circuit
- mcu
- alternating voltage
- signal
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Abstract
The utility model discloses an AC voltage detecting device mainly comprising an AC voltage sampling and converting circuit, an input filtering circuit, a single-pole converting circuit, a MCU, and a LCD display device. The AC voltage sampling and converting circuit, the input filtering circuit, and the single-pole converting circuit are successively connected and then a signal is inputted into the MCU. After the MCU processes the signal, a detected result is displayed on the LCD display device. By using above scheme, isolation between high voltage and low voltage is achieved by using a voltage transformer so that the circuit performance is secure and reliable and anti-interference capability is strong. The power grid AC voltage detecting circuit has characteristics of a simple structure, complete functions, reliable quality, and high precision. The AC voltage detecting device well achieves isolation between strong electricity and weak electricity and employs a high-speed 32-bit MCU to perform processing and internally-placed A/D conversion in order to achieve simple and effective circuit hardware design. And AC voltage waveforms can be directly observed on the LCD display screen.
Description
Technical field
The utility model relates to the grid ac voltage fields of measurement, specifically is applied to the alternating voltage pick-up unit of intelligent powerless compensation measure and control device and power factor controller.
Background technology
Ac grid voltage is to having a great impact in normal use and the serviceable life thereof of household electrical appliance, industrial automation equipment, instrument and meter, overtension often shortens its serviceable life even causes and burn, and brownout may cause the faults such as equipment can not normally start.Load and the distribution situation of electrical network also can be reflected indirectly by line voltage numerical value simultaneously, therefore ac grid system is carried out the measurement of high precision, multiparameter, be fully to understand the operation of power networks situation, seek and solve the important channel of the problem of electric system appearance.
Network voltage detection method commonly used is with discrete component alternating voltage to be converted to direct current signal through rectifying and wave-filtering, is then detected by the DC voltage detection chip.The advantage of this detection scheme is the size that simply directly reflects line voltage.Shortcoming is, the circuit hardware design is complicated, and parameter is not easy to determine, measuring accuracy is often not high yet, can not reflect in real time the concrete condition of line voltage.
The utility model content
For the deficiency that above-mentioned prior art exists, the utility model provides a kind of testing circuit of simple for structure, multiple functional, reliable in quality high precision electrical network alternating voltage.It can accomplish the strong and weak electricity isolation well, and 32 MCU of sampling high speed process and built-in A/D changes so that the circuit hardware simplicity of design is effective, more can directly observe by LCD display the waveform of alternating voltage.
To achieve these goals, the utility model is by the following technical solutions:
A kind of alternating voltage pick-up unit is characterized in that: mainly comprise alternating voltage sampling and change-over circuit, input filter circuit, unipolarity change-over circuit, MCU and LCD display device; Alternating voltage sampling and change-over circuit and input filter circuit, unipolarity change-over circuit input to MCU with signal after being linked in sequence, and show testing result in the LCD display device after the MCU processing signals.
Described alternating voltage sampling and change-over circuit, it mainly comprises a voltage transformer (VT), voltage transformer (VT) output terminal and the isolation of former limit circuit electricity, voltage transformer (VT) and measured circuit are connected in parallel.
The delivery side resistance in series of described voltage transformer (VT), and pass through the dual power supply operational amplifier with the ac current signal signal conversion voltage.
Described input filter circuit, it is comprised of a resistance and an electric capacity.
Described unipolarity change-over circuit comprises an OP amplifier, and the OP amplifier converts the bipolar voltage signal to the unipolarity voltage signal.
After adopting such scheme, the sampled voltage mutual inductor is realized the high-low pressure isolation, makes circuit performance safe and reliable, and antijamming capability is stronger.The testing circuit of simple for structure, multiple functional, reliable in quality high precision electrical network alternating voltage.It can accomplish the strong and weak electricity isolation well, and 32 MCU of sampling high speed process and built-in A/D changes so that the circuit hardware simplicity of design is effective, more can directly observe by LCD display the waveform of alternating voltage.
Description of drawings
Fig. 1 is fundamental diagram of the present utility model.
Embodiment
The below is described in further detail the utility model according to accompanying drawing:
A kind of alternating voltage pick-up unit as shown in Figure 1 mainly comprises alternating voltage sampling and change-over circuit, input filter circuit, unipolarity change-over circuit, MCU and LCD display device; Alternating voltage sampling and change-over circuit and input filter circuit, unipolarity change-over circuit input to MCU with signal after being linked in sequence, and show testing result in the LCD display device after the MCU processing signals.
Wherein alternating voltage sampling and change-over circuit are realized by voltage transformer (VT) TYPT31C.TYPT31 type voltage transformer (VT) output terminal and former limit circuit are the electricity isolation, and mutual inductor is connected in parallel by resistance and the measured circuit of connecting with the former limit of module circuit, and output current is proportional to original edge voltage.Disturb in order to suppress high frequency noise and spike in addition, exchanging input side two the six hole magnetic beads of having connected.For the A/D ALT-CH alternate channel of MCU detects, must be converted to voltage to output current, so the outgoing side of voltage transformer (VT) connected resistance and by dual power supply operational amplifier OP07C successfully with the ac current signal signal conversion voltage.Overcome in the work of single supply amplifier the fully problem of 0V Voltage-output.The DC characteristic of general High-precision O P amplifier is all very outstanding, and the AC characteristic such as frequency characteristic and switching rate are poor, so form RC low pass input filter circuit by a resistance and an electric capacity, be used for the attenuate high frequency noise, when preventing that frequency input signal is high, switching rate is not enough and distortion occurs, and a part is exchanged become flip-flop.The unipolarity change-over circuit is realized by the OP amplifier TLC2274AI of high precision mV level, converts the bipolar voltage signal to the unipolarity voltage signal, in order to satisfy the requirement of MCU input 0-3.3V voltage signal.MCU adopts 32 cortex-m3 family chips, built-in A/D conversion, and arithmetic speed is faster, and measuring accuracy is higher.Show real-time reflection line voltage information by the LCD screen display at last.
Beneficial effect (technical characterictic technique effect that directly bring or produced certainty by technical characterictic): the utlity model has following advantage:
1, the sampled voltage mutual inductor is realized the high-low pressure isolation, makes circuit performance safe and reliable, and antijamming capability is stronger;
2, hardware circuit is simple, effectively;
3, RC low-pass filtering, and six hole magnetic beads effectively suppress high frequency noise and spike and disturb;
4, sampling mV rank High-precision O P amplifier has guaranteed the accuracy of measuring;
5, adopt High Performance SCM, have fast operation, the characteristics that sampling precision is high;
6, the I/O control signal need not be controlled by CPLD directly by CPU control, has integrated level high, controls reliable characteristics;
7, adopt high speed, high-resolution A/D converter, realized every cycle 24 point samplings.High precision and the response speed of remote measurement amount have been guaranteed;
8, LCD display can reflect line voltage information straightforwardly, comprises voltage swing, waveform, the important parameters such as harmonic content.Man-machine interface is friendly.
Claims (5)
1. an alternating voltage pick-up unit is characterized in that: mainly comprise alternating voltage sampling and change-over circuit, input filter circuit, unipolarity change-over circuit, MCU and LCD display device; Alternating voltage sampling and change-over circuit and input filter circuit, unipolarity change-over circuit input to MCU with signal after being linked in sequence, and show testing result in the LCD display device after the MCU processing signals.
2. a kind of alternating voltage pick-up unit according to claim 1, it is characterized in that: described alternating voltage sampling and change-over circuit, it mainly comprises a voltage transformer (VT), voltage transformer (VT) output terminal and the isolation of former limit circuit electricity, and voltage transformer (VT) and measured circuit are connected in parallel.
3. a kind of alternating voltage pick-up unit according to claim 2 is characterized in that: the delivery side resistance in series of described voltage transformer (VT), and by the dual power supply operational amplifier with the ac current signal signal conversion voltage.
4. a kind of alternating voltage pick-up unit according to claim 1, it is characterized in that: described input filter circuit, it is comprised of a resistance and an electric capacity.
5. a kind of alternating voltage pick-up unit according to claim 1, it is characterized in that: described unipolarity change-over circuit mainly comprises an OP amplifier, and the OP amplifier converts the bipolar voltage signal to the unipolarity voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220492195 CN202886461U (en) | 2012-09-25 | 2012-09-25 | An AC voltage detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220492195 CN202886461U (en) | 2012-09-25 | 2012-09-25 | An AC voltage detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202886461U true CN202886461U (en) | 2013-04-17 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220492195 Expired - Fee Related CN202886461U (en) | 2012-09-25 | 2012-09-25 | An AC voltage detecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202886461U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445536A (en) * | 2015-12-29 | 2016-03-30 | 上海贝电实业（集团）股份有限公司 | Alternating current voltage acquisition device and working method thereof |
-
2012
- 2012-09-25 CN CN 201220492195 patent/CN202886461U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445536A (en) * | 2015-12-29 | 2016-03-30 | 上海贝电实业（集团）股份有限公司 | Alternating current voltage acquisition device and working method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20190925 |