CN207281168U - A kind of sine wave phase frequency harvester based on double Schmidt triggers - Google Patents
A kind of sine wave phase frequency harvester based on double Schmidt triggers Download PDFInfo
- Publication number
- CN207281168U CN207281168U CN201720875770.XU CN201720875770U CN207281168U CN 207281168 U CN207281168 U CN 207281168U CN 201720875770 U CN201720875770 U CN 201720875770U CN 207281168 U CN207281168 U CN 207281168U
- Authority
- CN
- China
- Prior art keywords
- phase frequency
- sine wave
- electrically connected
- schmidt
- microprocessor
- 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
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
The utility model discloses the sine wave phase frequency harvester based on double Schmidt triggers.The utility model includes wave filter, the first Schmidt trigger, the second Schmidt trigger, the first division module, the second division module and microprocessor.The utility model can detect signal to the sine wave of distortion and be detected in the case where that need not detect the specific amplitude of signal.Simultaneously as the utility model make use of difference algorithm in the algorithm, the interference of part can be eliminated, improves accuracy.
Description
Technical field
The utility model is related to signal frequency and signal phase collection field, more particularly, to one kind based on it is double apply it is close
The sine wave phase frequency harvester of special trigger.
Background technology
The new high voltage electric equipment designed and manufacture, the weak ring in insulation can be found in time by measurement of partial discharge
Section, prevents design and the mistake in manufacturing process and the improper use of material.Shelf depreciation test is to differentiate product insulation or set
A kind of important method of standby operational reliability.It can find the equipment deficiency that pressure test can not be found.Shelf depreciation is tested
One of big event of current power equipment preventive trial.
In shelf depreciation test, since the test point and shelf depreciation test point of instrument for measuring partial discharge are distant,
It is inconsistent there are phase, the problem of shelf depreciation test point phase can not be verified.Existing way is passed through after being sampled by AD
Microcontroller Digital Signal Processing and the method for RTC real-time timepiece chip intercept signal zero crossing timing reach acquisition phase frequency
Purpose.However, this method needs to meet the sine wave that detection signal is a standard, otherwise crossing may when 0 phase obtains
Phase frequency is caused to obtain because of signal irregular inaccurate.In real work, feelings of the detection signal there may be distortion
Condition, causes the time difference for calculating to might have deviation at 0 point, so that under method the institute measured frequency and phase accuracy of zero passage timing
Drop.
Utility model content
The utility model overcomes the defects of existing phase frequency acquisition method calculates the sine wave detection signal of distortion,
Provide a kind of new sine wave phase frequency harvester based on double Schmidt triggers.The utility model passes through two-way Schmidt
Trigger carries out phase frequency collection, can detect signal to the sine wave of distortion and be acquired, and for external anti-interference
It is stronger, improve the accuracy for detection hobby.
The technical solution of the utility model is as follows：
A kind of sine wave phase frequency harvester based on double Schmidt triggers, phase frequency harvester carry out detection signal
Frequency collection and phase acquisition, phase frequency harvester include wave filter, the first Schmidt trigger, the second Schmidt trigger,
First division module, the second division module and microprocessor, wherein：
Input terminal of the input terminal of wave filter as phase frequency harvester, the output terminal of wave filter and the first schmidt trigger
The input terminal of device is electrically connected；
The output terminal of wave filter is electrically connected with the input terminal of the second Schmidt trigger；
The output terminal of first Schmidt trigger is electrically connected with the input terminal of the first division module；
First Schmidt trigger is electrically connected with microprocessor；
The output terminal of second Schmidt trigger is electrically connected with the input terminal of the second division module；
Second Schmidt trigger is electrically connected with microprocessor；
The output terminal of first division module is electrically connected with microprocessor；
The output terminal of second division module is electrically connected with microprocessor.
The phase frequency harvester course of work is as follows：Detection signal passes through wave filter, filter high-frequency interference signal.Then incited somebody to action
Detection signal after filter passes through two-way Schmidt trigger respectively, the threshold voltage of two-way Schmidt trigger be it is different, because
This can produce the different triggered times, form different rectangular signals.Rectangular signal obtains decompression letter by division module respectively
Number.Microprocessor obtains signal from 0 point by reading triggered time and the threshold voltage of two-way Schmidt trigger by algorithm
To the time of threshold voltage.
In a kind of preferable scheme, wave filter is low-pass filter.Low-pass filter is used to filter in detection signal
High-frequency interferencing signal.
In a kind of preferable scheme, the first division module is scaling circuit.The input resistance of scaling circuit
Very high, output resistance is very low, can provide larger amplification factor.
In a kind of preferable scheme, the second division module is scaling circuit.
In a kind of preferable scheme, microprocessor is microcontroller.Microcontroller has the features such as cost is low, low in energy consumption.
In a kind of preferable scheme, a kind of sine wave phase frequency harvester based on double Schmidt triggers further includes aobvious
Showing device, data storage and wireless communication module, its connection relation are as follows：
Microprocessor is electrically connected with data storage；
Microprocessor is electrically connected with the input terminal of display module；
Microprocessor is electrically connected with the input terminal of wireless communication module.
In a kind of preferable scheme, display module is LCD display.
In a kind of preferable scheme, data storage is TF card.TF card has capacity height, the function that can be read and write repeatedly
In a kind of preferable scheme, wireless communication module is that serial ports turns 4G communication modules.
The algorithm steps that microprocessor performs are as follows：
S1：Pass through the first Schmidt trigger described in the microcomputer reads or second Schmidt trigger
Positive trigger time ta1 and negative trigger time tb1, the frequency f=1/ (2* (ta1-tb1)) of signal；
S2：Applied by the trigger time T1 and described second of the first Schmidt trigger described in the microcomputer reads
The trigger time T2 of schmitt trigger, the trigger time T1 and described second for defining first Schmidt trigger are applied
The trigger time T2 of schmitt trigger is the triggered time occurred in the detection signal in same cycle, and two Schmidts touch
The triggered time that device is in identical triggering state is sent out, obtains △ t=T2-T1, wherein △ t represent the triggering of two Schmidt triggers
Time difference；
S3：The forward threshold voltage for defining first Schmidt trigger is V1, defines second schmidt trigger
The forward threshold voltage of device is V2, and the amplitude for defining the detection signal be A, and the first Schmidt trigger of definition is by 0 point of signal
The period for reaching positive threshold voltage to signal is t1, defines the second Schmidt trigger and reaches positive threshold by 0 point of signal to signal
The period of threshold voltage is t2, with reference to S2, is obtained：V1=A*sin (t1) and V2=A*sin (t2), V2 is derived from reference to S2
=A*sin (t1+ △ t)；
S4：Obtained by S3That is V1*sin (t1+ △ t)=V2*sin (t1)；
S5：V1*sin (t1+ △ t)=V1* (sint1*cos △ t+sin △ t*cost1)=V2*sin is obtained by S4
(t1), x=sint1 and a=sin △ t are made, are obtainedWith
S6：Obtained by S5
S7：Obtained by S6Pass through
Antitrigonometric function tries to achieve t1, with reference to the frequency f of the signal obtained in S1, calculates the initial phase of triggering moment.
Compared with prior art, the beneficial effect of technical solutions of the utility model is：
(1) amplitude for only needing to ensure detection signal is more than the threshold voltage of Schmidt trigger, it is possible to phase frequency is gathered,
The specific amplitude of signal need not be detected.
(2) the utility model passage time difference calculates initial phase, and signal is detected suitable for the sine wave of distortion.
(3) even if detection signal has interference, since the interference of two-way detection signal is substantially identical, using this reality
Interference is eliminated with new algorithm of checking the mark so that the accuracy of testing result improves.
Brief description of the drawings
Fig. 1 is the utility model connection relation structure chart.
Fig. 2 is parameter definition exemplary plot.
Fig. 3 is the utility model microprocessor algorithm flow chart.
Embodiment
Attached drawing is only for illustration, it is impossible to is interpreted as the limitation to this patent；
In order to more preferably illustrate the present embodiment, some components of attached drawing have omission, zoom in or out, and do not represent actual product
Size；
To those skilled in the art, it is to be appreciated that some known features and its explanation, which may be omitted, in attached drawing
's.
The technical solution of the utility model is described further with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of sine wave phase frequency harvester based on double Schmidt triggers, phase frequency harvester is to inspection
Survey signal and carry out frequency collection and phase acquisition, phase frequency harvester includes low-pass filter, the first Schmidt trigger, second
Schmidt trigger, the first scaling circuit, the second scaling circuit, microcontroller LCD display, TF card and serial ports turn 4G
Communication module, wherein：
Input terminal of the input terminal of low-pass filter as phase frequency harvester, detects input of the signal from low-pass filter
End enters phase frequency harvester, and the output terminal of wave filter is electrically connected with the input terminal of the first Schmidt trigger；
The output terminal of low-pass filter is electrically connected with the input terminal of the second Schmidt trigger；
The output terminal of first Schmidt trigger is electrically connected with the input terminal of the first scaling circuit；
First Schmidt trigger and monolithic mechatronics；
The output terminal of second Schmidt trigger is electrically connected with the input terminal of the second scaling circuit；
Second Schmidt trigger and monolithic mechatronics；
The output terminal of first scaling circuit and monolithic mechatronics；
The output terminal of second scaling circuit and monolithic mechatronics；
Microcontroller is electrically connected with TF card；
Microcontroller is electrically connected with the input terminal of LCD display；
The input terminal that microcontroller turns 4G communication modules with serial ports is electrically connected.
Microcontroller performs following steps：
S1：Wherein positive and negative triggered time of Schmidt trigger all the way is read by microcontroller.
If positive triggered time ta1 and negative triggered time tb1；
S2：The frequency of detection signal is calculated according to the positive and negative triggered time.
The frequency f=1/ (2* (ta1-tb1)) of signal；
S3：The positive and negative triggered time of two-way Schmidt trigger is read by microcontroller.
If the trigger time T2 of the trigger time T1 of the first Schmidt trigger and the second Schmidt trigger, first
The trigger time T1 of the Schmidt trigger and trigger time T2 of the second Schmidt trigger is the inspection in the same cycle
The triggered time occurred is surveyed in signal.Here, the triggered time in negative triggering state occurs as embodiment, as shown in Figure 2.If △
T=T2-T1, wherein △ t represent that the triggered time of two Schmidt triggers is poor.
S4：With reference to the positive threshold of two Schmidt triggers, derived using mathematical formulae, obtain t1.
S4.1：The forward threshold voltage for defining the first Schmidt trigger is V1, is defining the second Schmidt trigger just
It is V2 to threshold voltage, the amplitude of definition detection signal be A, and the first Schmidt trigger of definition is reached by 0 point of signal to signal
The period of positive threshold voltage be t1, the second Schmidt trigger of definition by 0 point of signal to signal reach positive threshold voltage when
Between section be t2, obtain：V1=A*sin (t1) and V2=A*sin (t2), V2=A*sin (t1+ △ t) is derived from reference to S3；
S4.2：Obtained by S4.1That is V1*sin (t1+ △ t)=V2*sin (t1)；
S4.3：V1*sin (t1+ △ t)=V1* (sint1*cos △ t+sin △ t*cost1)=V2* is obtained by S4.2
Sin (t1),
X=sint1 and a=sin △ t are made, are obtainedWith
S4.4：Obtained by S4.3
S4.5：Obtained by S4.4
S4.6：T1 is tried to achieve by antitrigonometric function,
S5：Binding signal frequency, obtains initial phase during Schmidt trigger triggering.
S6：The frequency parameter of signal and phase parameter are turned 4G communication modules by serial ports to send to far end system.
S7：The frequency parameter of signal and phase parameter are transmitted to TF card.
S8：The frequency parameter of signal and phase parameter is shown above out in LCD display.
The same or similar label correspond to the same or similar components；
The terms describing the positional relationship in the drawings are only for illustration, it is impossible to is interpreted as the limitation to this patent；
Obviously, above-described embodiment of the utility model is only intended to clearly illustrate the utility model example, and
It is not the restriction to the embodiment of the utility model.For those of ordinary skill in the field, in described above
On the basis of can also make other variations or changes in different ways.There is no need and unable to give all embodiments
It is exhaustive.All any modification, equivalent and improvement made where within the spirit and principles of the present invention etc., should be included in
Within the protection domain of the utility model claims.
Claims (9)
1. a kind of sine wave phase frequency harvester based on double Schmidt triggers, the phase frequency harvester to detection signal into
Line frequency gather and phase acquisition, its feature is as follows, the phase frequency harvester include wave filter, the first Schmidt trigger,
Second Schmidt trigger, the first division module, the second division module and microprocessor are wherein：
Input terminal of the input terminal of the wave filter as the phase frequency harvester, the output terminal of the wave filter and described the
The input terminal of one Schmidt trigger is electrically connected；
The output terminal of the wave filter is electrically connected with the input terminal of second Schmidt trigger；
The output terminal of first Schmidt trigger is electrically connected with the input terminal of the first division module；
First Schmidt trigger is electrically connected with the microprocessor；
The output terminal of second Schmidt trigger is electrically connected with the input terminal of the second division module；
Second Schmidt trigger is electrically connected with the microprocessor；
The output terminal of first division module is electrically connected with the microprocessor；
The output terminal of second division module is electrically connected with the microprocessor.
2. a kind of sine wave phase frequency harvester based on double Schmidt triggers according to claim 1, its feature exist
In the wave filter is low-pass filter.
3. a kind of sine wave phase frequency harvester based on double Schmidt triggers according to claim 2, its feature exist
In first division module is scaling circuit.
4. a kind of sine wave phase frequency harvester based on double Schmidt triggers according to claim 2, its feature exist
In second division module is scaling circuit.
5. a kind of sine wave phase frequency harvester based on double Schmidt triggers according to claim 3 or 4, its feature
It is, the microprocessor is microcontroller.
6. a kind of sine wave phase frequency harvester based on double Schmidt triggers according to claim 1, its feature exist
In a kind of, sine wave phase frequency harvester based on double Schmidt triggers further include display device, data storage and
Wireless communication module, its connection relation are as follows：
The microprocessor is electrically connected with the data storage；
The microprocessor is electrically connected with the input terminal of the display module；
The microprocessor is electrically connected with the input terminal of the wireless communication module.
7. a kind of sine wave phase frequency harvester based on double Schmidt triggers according to claim 6, its feature exist
In the display module is LCD display.
8. a kind of sine wave phase frequency harvester based on double Schmidt triggers according to claim 6, its feature exist
In the data storage is TF card.
9. a kind of sine wave phase frequency harvester based on double Schmidt triggers according to claim 6, its feature exist
In the wireless communication module is that serial ports turns 4G communication modules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720875770.XU CN207281168U (en) | 2017-07-18 | 2017-07-18 | A kind of sine wave phase frequency harvester based on double Schmidt triggers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720875770.XU CN207281168U (en) | 2017-07-18 | 2017-07-18 | A kind of sine wave phase frequency harvester based on double Schmidt triggers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207281168U true CN207281168U (en) | 2018-04-27 |
Family
ID=61985437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720875770.XU Active CN207281168U (en) | 2017-07-18 | 2017-07-18 | A kind of sine wave phase frequency harvester based on double Schmidt triggers |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207281168U (en) |
-
2017
- 2017-07-18 CN CN201720875770.XU patent/CN207281168U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104849649B (en) | A kind of detection method of current transformer for metering secondary circuit state | |
| CN106018985B (en) | The detection method and its system of three-phase electric energy meter voltage negative phase sequence | |
| CN107462771B (en) | A kind of phase frequency acquisition device based on double Schmidt triggers | |
| CN202548088U (en) | Method for detecting moisture in oil and device for method | |
| CN105318918A (en) | A non-magnetic flow metering device and a metering method thereof | |
| CN202066910U (en) | Device for measuring resistance, inductance and capacitance | |
| CN104655933A (en) | LC resonance and phase detection-based inductance measuring method and circuit | |
| CN201909812U (en) | Novel phase difference detection circuit | |
| CN108761159B (en) | Metering device detection system based on wide-area synchronous measurement electric energy meter | |
| CN110208603A (en) | A kind of transformer voltage phase difference measuring apparatus and measurement method | |
| CN207281168U (en) | A kind of sine wave phase frequency harvester based on double Schmidt triggers | |
| CN207650273U (en) | A kind of sine wave freuqency harvester based on difference algorithm | |
| CN104698316A (en) | Connection state detecting circuit, battery internal resistance detecting device and battery tester | |
| CN103020566B (en) | A kind of radio-frequency identification reader/writer circuit for detecting intensity of received signal and detection method | |
| CN104198879A (en) | Polarity tester | |
| CN103592515A (en) | Universal phase identifier | |
| CN206161582U (en) | Electric capacity type soil moisture sensor | |
| CN208399622U (en) | A kind of power utility check instrument for checking low-voltage power line leakage point of electricity | |
| CN207819885U (en) | A kind of phase frequency follow-up mechanism for partial discharge test | |
| CN203436320U (en) | Body temperature infrared measurement system | |
| CN202350927U (en) | Intelligently universal digital display device | |
| CN203825145U (en) | Device for detecting partial discharge of terminal of on-site power cable | |
| CN103438911B (en) | LC resonant transducer reading system under fixed pattern frequently and method | |
| CN202471644U (en) | Intrinsically safe coal sample moisture content tester for mining | |
| CN205120817U (en) | Test of dielectric loss tangent value is with electric current and voltage detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |