CN208984705U - A kind of device of non-contact measurement sinusoidal current signal frequency and peak value - Google Patents
A kind of device of non-contact measurement sinusoidal current signal frequency and peak value Download PDFInfo
- Publication number
- CN208984705U CN208984705U CN201821682320.XU CN201821682320U CN208984705U CN 208984705 U CN208984705 U CN 208984705U CN 201821682320 U CN201821682320 U CN 201821682320U CN 208984705 U CN208984705 U CN 208984705U
- Authority
- CN
- China
- Prior art keywords
- signal
- operational amplifier
- peak value
- voltage
- power amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model belongs to field of measuring technique, it is related to a kind of circuit for measuring sinusoidal current signal frequency and peak value, to solve the problems, such as contact type measurement equipment, Portable belt, volume be not big, expensive, it is proposed the device of a kind of non-contact measurement sinusoidal current signal frequency and peak value, including signal input part, power amplifier, load resistance, current sensor, signal processing circuit, converter, single-chip microcontroller, display；The signal input part is connect with power amplifier, for the sinusoidal current signal of acquisition to be sent to power amplifier；Current sensor is used to incude the current signal in the closed circuit, and sine voltage signal is converted by inductive signal and is transmitted to signal processing circuit, sinusoidal crest value is recorded by voltage follower, square-wave signal is changed by voltage comparator, and obtain frequency values with Measuring Frequency Method.Non-cpntact measurement is realized, effectively reduces equipment volume, it can be achieved that portability, miniaturization.
Description
Technical field
The utility model belongs to field of measuring technique, is related to a kind of measurement sinusoidal current signal frequency and peak value measurement electricity
Road.
Background technique
With the arrival of information age, AI technology and mechanics of communication it is gradually powerful, for the testing requirements of signal
It is higher and higher, so more and more high-precision oscillograph occurs, in detection field for the frequency and peak value of sinusoidal signal
Measurement belongs to basic capacity.
There are two ways to prior art, most of oscilloscope measurement frequencies periodic method and lee sajous graphics method measured frequency,
The measurement most of oscillographs of peak value can be measured directly, but with the gradually development of high-precision oscillograph, oscillograph
Also gradually appear that volume becomes larger, weight becomes heavy, expensive, not the problem of Portable belt.The oscillograph of contact type measurement there is also
Hidden micro- security risk.
Utility model content
The utility model is safety issue existing for solution contact type measurement, Portable belt, volume be not big, expensive
Problem, the technical solution adopted is as follows:
The device of a kind of non-contact measurement sinusoidal current signal frequency and peak value, including signal input part, power amplification
Device, load resistance, current sensor, signal processing circuit, converter, single-chip microcontroller, display；The signal input part with
Power amplifier connection, for the sinusoidal current signal of acquisition to be sent to power amplifier；
The output end of the load resistance access power amplifier, and constitute closed circuit；
The current sensor is used to incude the current signal in the closed circuit；
Inductive signal in current sensor is converted into sine voltage signal by resistance R1, this voltage signal is transmitted to letter
Number processing circuit；
The signal processing circuit includes as the first operational amplifier of voltage amplifier, as voltage follower
Second operational amplifier, the third operational amplifier as voltage comparator；The voltage signal is transmitted to the first operation and puts
Big device, the output voltage signal of the first operational amplifier are respectively sent to second operational amplifier and third operational amplifier；
Sine voltage signal is converted into horizontal electricity identical with sine voltage signal peak value after second operational amplifier
Signal is pressed, inputs single-chip microcontroller pin using converter；
Sine voltage signal is converted into square-wave voltage output after third operational amplifier, which accesses monolithic power traction
Foot；
After the signal of second operational amplifier and third operational amplifier that the single-chip microcontroller receives, processing result is passed
Transport to display.
Preferably, converter is inputted using 16 AD of AD7705.
Preferably, the first operational amplifier, second operational amplifier and third operational amplifier use lf353 operation amplifier
Device.
Preferably, power amplifier uses AD8367 power amplifier module.
Preferably, the load resistance using the resistance to piezoresistance of industry as power amplifier.
Preferably, manganese core is around enameled wire as current sensor.
Compared with prior art, the technical scheme is characterized in that: it is convenient light and handy, structure is simple, is convenient for carrying, it is non-contact
Formula design can reduce operation error, improve safety.
Detailed description of the invention
Fig. 1 is the schematic device of non-contact measurement sinusoidal current signal frequency and peak value；
Fig. 2 is the device working principle diagram of non-contact measurement sinusoidal current signal frequency and peak value；
Fig. 3 is signal processing circuit figure；
Fig. 4 is single-chip microcontroller external connection module pinouts.
Specific embodiment
The utility model is further described with reference to the accompanying drawings and embodiments:
Embodiment one:
The device of a kind of non-contact measurement sinusoidal current signal frequency and peak value, as shown in Figure 1, including signal input part
1, power amplifier, load resistance R, current sensor 2, signal processing circuit, converter, single-chip microcontroller, display 3；It is described
Signal input part connect with power amplifier, for the sinusoidal current signal of acquisition to be sent to power amplifier；
The output end of the load resistance access power amplifier, and constitute closed circuit；
The current sensor is used to incude the current signal in the closed circuit；
Inductive signal in current sensor is converted into sine voltage signal by resistance R1, this voltage signal is transmitted to letter
Number processing circuit；
The signal processing circuit is as shown in figure 3, include as the first operational amplifier 4 of voltage amplifier, conduct
The second operational amplifier 5 of voltage follower, the third operational amplifier 6 as voltage comparator；The voltage signal passes
The first operational amplifier is transported to, the output voltage signal of the first operational amplifier is respectively sent to second operational amplifier and third
Operational amplifier；
Sine voltage signal is converted into horizontal electricity identical with sine voltage signal peak value after second operational amplifier
Signal is pressed, inputs single-chip microcontroller pin using converter；
Sine voltage signal is converted into square-wave voltage output after third operational amplifier, which accesses monolithic power traction
Foot；
After the signal of second operational amplifier and third operational amplifier that the single-chip microcontroller receives, processing result is passed
Transport to display.
Above-mentioned apparatus working principle is as shown in Figure 2:
The power amplifier can amplify tested sinusoidal current signal；
The high power load can be used as the load resistance of amplification sinusoidal current signal;
The function of contactless transmission sinusoidal signal may be implemented in the current inductor, and transmits signals to and have
The signal processing circuit of the measurement frequency and measurement peak function.Third operational amplifier as voltage comparator is to survey
Frequency circuit is measured, the sine voltage signal of input is transformed into square-wave signal, by teaching material in the prior art " electronic surveying " third
Version, Jiang Huanwen, China Measuring Press, Measuring Frequency Method described in page 156 handle out the frequency of signal.
The measurement frequency uses Measuring Frequency Method, measures time t required for ten failing edges, then can be in the hope of input letter
Number frequency are as follows:
Third operational amplifier as voltage follower is measurement Peak current, and the sine voltage signal of input is changed
Horizontal voltage signal identical with sine voltage signal peak value measures voltage value by AD method for transformation in the prior art, ginseng
Examine document " digital voltmeter based on AD7705 and 51 single-chip microcontrollers ", Wu Junfeng, Baidu library.Show numerical value and measured signal peak
The power amplification multiple being arranged there are linear relationship, linear gradient with device internal element and independently between value etc. is related, and
It is certain value when not changing inside device.The sine electricity that can the use of a certain known peak value is first aV before use device measures
Stream signal calculates fixed slope k with numerical value b shown by AD are as follows:
Peak computational to tested sinusoidal current signal is carried out by the calculated k, numerical value as shown is b',
Then measured signal peak value a' are as follows:
Embodiment two:
The device of a kind of non-contact measurement sinusoidal current signal frequency and peak value on the basis of example 1, AD conversion
Device is inputted using 16 AD of AD7705, and the first operational amplifier, second operational amplifier and third operational amplifier use
Lf353 operational amplifier；Power amplifier uses AD8367 power amplifier module, is put using the resistance to piezoresistance of industry as power
The load resistance of big device, manganese core is around enameled wire as current sensor；Using 89C51 single-chip microcontroller.
Above-mentioned power amplifier is acted on using the current control of triode and is converted to the power of power supply according to input signal
The electric current of variation.The collector current of triode is β times of base current forever, and β is the exchange amplification factor of triode, application
This point, if small signal is injected base stage, the electric current that collector flows through can be equal to β times of base current, then believe this
It number is isolated with capacitance, just having obtained electric current is β times original of big signal, then passes through the adjustable resistance of a 50K,
The different output voltage of available amplitude, to also achieve the purpose that power amplification.
Above-mentioned current sensor uses non-contact current sensor, winds 200 circles on manganese core magnet ring with enameled wire, scrapes
The paint for falling both ends can access circuit, and the conducting wire of tested electric current is passed through from magnet ring center, that is, may make up current sensor.Its coil
The output voltage at both ends is N2 times (N1 is the number of turns of the conducting wire of tested electric current, and N2 is the number of turns of enameled wire) of input voltage.
Signal processing circuit constitutes processing sinusoidal frequency and peak value module using lf353 operational amplifier, as shown in figure 3,
Access 1,2 is pulled out by electromagnetic coil, accesses the positive grade of 1 input channel of operational amplifier, operational amplifier is provided by positive and negative 12V, is transported
Put 1 cathode access R2 and slide rheostat R3, whole structure voltage send out big device, later access operational amplifier 2 and operational amplifier
3,2 cathode of operation connects two diodes and another operational amplifier 4 is formed together a simple follower, and then forms peak value
Processing circuit.Operational amplifier 3 forms voltage comparator, and then forms frequency processing module.
Wherein frequency module and processing, main amplifier lf353 constitute voltage comparator, convert pulse letter for sinusoidal signal
Number, the zener diode for being 5V by a breakdown reverse voltage obtains burning voltage output, then inputs one-chip machine port,
Single-chip microcontroller external connection module pin is measured required for ten failing edges as shown in figure 4, using Measuring Frequency Method in the prior art
Then time t can be 10/t in the hope of frequency input signal.
Peak value processing circuit is broadly divided into three parts: capacitor, diode, operational amplifier.Peak detection it is basic
Principle is by a simple voltage follower.Then in circuit and a capacitor is connect, when waveform values increase, display portion
It can indicate that this increase process, while capacitor is also charging, the voltage of capacitor is continuously increased.When the peak-fall of waveform,
Capacitor has charged, this is the maximum value that capacitor record is shown in waveform display portion.The unilateral conduction of diode can be with
Prevent capacitance voltage from declining, the voltage of diode " will not be lost " this ensures that display portion record is exactly input waveform
Maximum value.
Display can be used 0led display module, and Oled is 0.96 cun of matrix display panel of one kind 128 × 64, every time can be
Show that a character, each character can use 32 array representations in 8 × 8 region.Inside it is encapsulated in display screen back glass
SSD1306 driving chip and GT20L16S1Y word-base chip on substrate.Module interface is 8 contact pins, and stitch definition has been imprinted on
On plate, serial SPI protocol is used.Because of onboard voltage stabilizing chip, module for power supply voltage can be 3-5V.
The sample signal of acquisition is connect by input terminal with power amplifier by the technical program, uses current sensor sense
The current signal that should be amplified, and convert sine voltage signal for inductive signal and be transmitted to signal processing circuit, pass through voltage
Follower records sinusoidal crest value, is changed into square-wave signal by voltage comparator, and obtain frequency values with Measuring Frequency Method.It realizes
Non-cpntact measurement effectively reduces equipment volume, it can be achieved that portability minimizes.
The technical program unspecified part belongs to techniques well known.
Claims (6)
1. the device of a kind of non-contact measurement sinusoidal current signal frequency and peak value, it is characterised in that: including signal input part,
Power amplifier, load resistance, current sensor, signal processing circuit, converter, single-chip microcontroller, display；The signal
Input terminal is connect with power amplifier, for the sinusoidal current signal of acquisition to be sent to power amplifier；
The output end of the load resistance access power amplifier, and constitute closed circuit；
The current sensor is used to incude the current signal in the closed circuit；
Inductive signal in current sensor is converted into sine voltage signal by resistance R1, this voltage signal is transmitted at signal
Manage circuit；
The signal processing circuit includes as the first operational amplifier of voltage amplifier, as the second of voltage follower
Operational amplifier, the third operational amplifier as voltage comparator；The voltage signal is transmitted to the first operational amplifier,
The output voltage signal of first operational amplifier is respectively sent to second operational amplifier and third operational amplifier；
Sine voltage signal is converted into horizontal voltage letter identical with sine voltage signal peak value after second operational amplifier
Number, single-chip microcontroller pin is inputted using converter；
Sine voltage signal is converted into square-wave voltage output after third operational amplifier, which accesses single-chip microcontroller pin；
After the signal of second operational amplifier and third operational amplifier that the single-chip microcontroller receives, processing result is transmitted to
Display.
2. the device of a kind of non-contact measurement sinusoidal current signal frequency according to claim 1 and peak value, feature
Be: the converter is inputted using 16 AD of AD7705.
3. the device of a kind of non-contact measurement sinusoidal current signal frequency according to claim 1 and peak value, feature
Be: the first operational amplifier, second operational amplifier and the third operational amplifier uses lf353 operational amplifier.
4. the device of a kind of non-contact measurement sinusoidal current signal frequency according to claim 1 and peak value, feature
Be: the power amplifier is AD8367 power amplifier module.
5. the device of a kind of non-contact measurement sinusoidal current signal frequency according to claim 1 and peak value, feature
Be: the load resistance of power amplifier is the resistance to piezoresistance of industry.
6. the device of a kind of non-contact measurement sinusoidal current signal frequency and peak value described in one of -5 according to claim 1,
It is characterized by: current sensor is manganese core coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821682320.XU CN208984705U (en) | 2018-10-17 | 2018-10-17 | A kind of device of non-contact measurement sinusoidal current signal frequency and peak value |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821682320.XU CN208984705U (en) | 2018-10-17 | 2018-10-17 | A kind of device of non-contact measurement sinusoidal current signal frequency and peak value |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208984705U true CN208984705U (en) | 2019-06-14 |
Family
ID=66787884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821682320.XU Active CN208984705U (en) | 2018-10-17 | 2018-10-17 | A kind of device of non-contact measurement sinusoidal current signal frequency and peak value |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208984705U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542788A (en) * | 2019-09-23 | 2019-12-06 | 武汉理工大学 | composite current frequency sensor |
| CN110702977A (en) * | 2019-11-05 | 2020-01-17 | 西安科技大学高新学院 | Circuit for measuring current signal of power amplifier |
| CN111384781A (en) * | 2020-04-29 | 2020-07-07 | 张立 | 5G communication base station electric power operation monitoring system |
| CN116559520A (en) * | 2023-02-15 | 2023-08-08 | 海的电子科技(苏州)有限公司 | Voltage signal detection method, device and storage medium |
-
2018
- 2018-10-17 CN CN201821682320.XU patent/CN208984705U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542788A (en) * | 2019-09-23 | 2019-12-06 | 武汉理工大学 | composite current frequency sensor |
| CN110702977A (en) * | 2019-11-05 | 2020-01-17 | 西安科技大学高新学院 | Circuit for measuring current signal of power amplifier |
| CN111384781A (en) * | 2020-04-29 | 2020-07-07 | 张立 | 5G communication base station electric power operation monitoring system |
| CN111384781B (en) * | 2020-04-29 | 2020-12-18 | 上海民航新时代机场设计研究院有限公司 | 5G communication base station electric power operation monitoring system |
| CN116559520A (en) * | 2023-02-15 | 2023-08-08 | 海的电子科技(苏州)有限公司 | Voltage signal detection method, device and storage medium |
| CN116559520B (en) * | 2023-02-15 | 2023-10-17 | 海的电子科技(苏州)有限公司 | Voltage signal detection method, device and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN208984705U (en) | A kind of device of non-contact measurement sinusoidal current signal frequency and peak value | |
| CN103245824B (en) | Non-contact D-dot voltage transformer and voltage detection self-correcting method thereof | |
| CN103293566B (en) | Signal detection circuit of atmospheric ozone sonde | |
| CN209070006U (en) | A kind of current sensor | |
| CN108802467B (en) | Iron core coil type current transformer with high detection precision and electric leakage detection device | |
| CN1456901A (en) | Soft magnetic material characteristic measuring devices | |
| CN101520495B (en) | Device for mapping magnetizing characteristic curve of ferromagnetic materials and mapping method thereof | |
| CN105548725A (en) | Online detector for super capacitor and internal resistance detection method based on detector | |
| CN202794278U (en) | High-precision handheld type digital oscilloscope | |
| CN205229289U (en) | Radio frequency voltage current detection device | |
| CN208506130U (en) | Electronic tag resistance detection equipment | |
| CN106597091A (en) | DC electric energy meter | |
| CN206470343U (en) | High-voltage capacitance sparks the detecting system of process | |
| CN206321705U (en) | A kind of Multi-functional Digital Frequency Gauge based on STM32 | |
| CN206848359U (en) | A kind of high precision electro flow measurement circuitry | |
| CN204154375U (en) | Based on the electronic scale of electromagnetic induction | |
| CN201107348Y (en) | Two-wire system true effective value transmitter with TRMS signal conversion module as core | |
| CN204129211U (en) | A kind of base passive and wireless multi-parameter sensor intelligent electric energy meter temperature rise detecting device | |
| CN209043964U (en) | Current sensor | |
| CN204439695U (en) | A kind of Intelligent digital multimeter of voice broadcast | |
| CN203241479U (en) | Inductance and capacitance measuring instrument based on switching circuit | |
| CN107102201A (en) | A kind of integrated high-pressure electric power meter | |
| CN203204078U (en) | Test system for measuring earth grounding resistance | |
| CN109374961B (en) | A kind of current signal detecting device | |
| CN202710651U (en) | Device for measuring direct voltage and current |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |