CN109120267A - A kind of electric power signal synchronous sampling system and method - Google Patents
A kind of electric power signal synchronous sampling system and method Download PDFInfo
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- CN109120267A CN109120267A CN201811252357.3A CN201811252357A CN109120267A CN 109120267 A CN109120267 A CN 109120267A CN 201811252357 A CN201811252357 A CN 201811252357A CN 109120267 A CN109120267 A CN 109120267A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
- H03M1/1255—Synchronisation of the sampling frequency or phase to the input frequency or phase
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Abstract
The invention discloses a kind of electric power signal synchronous sampling systems, including mutual inductor, controller, A/D conversion chip, phaselocked loop and shaping circuit；On the one hand, after tested electric signals are converted through mutual inductor, can the shaping circuit through being connect with mutual inductor the tested electric signals of conversion are modified, be then forwarded to the phaselocked loop connecting with shaping circuit, export the sampled signal with frequency, it is ensured that the frequency synchronism of tested electric signals and sampled signal；On the other hand, the controller connecting with phaselocked loop and A/D conversion chip can control A/D conversion chip according to the sampled signal and the tested electric signals converted through mutual inductor are converted to digital signal in signal zero-crossing, can be further assured that the frequency synchronism of tested electric signals and sampled signal.The system can avoid leakage errors occur, improve electric signal measurement accuracy, and then improve the metering accuracy of electric energy metering device.In addition, the invention also discloses a kind of electric power signal synchronous sampling method, effect is as above.
Description
Technical field
The present invention relates to power system signals to acquire field, in particular to a kind of electric power signal synchronous sampling system and side
Method.
Background technique
Traditional electric power signal measuring device is generally adopted by the mode of Timing measurement to network voltage, electric current, that is, presses
Digital signal is converted analog signals into according to the sampling period of setting, this mode can be measured accurately in ideal power grid.
But in actual electric network, since power load can fluctuate often, and then mains frequency can be caused to change.Therefore, in reality
In power grid, once mains frequency fluctuates, the timing sampling period will deviate with power grid actual cycle, this periodicity
The accumulation of asynchronous error will lead to more serious lobe error, at this time to network voltage, electricity by the way of Timing measurement
When stream measures, error is unable to satisfy requirements of the national standard, and measurement accuracy is low.That is, utilizing a fixed frequency
Sampled signal go acquisition fluctuate AC signal nonsynchronous problem can occur, will lead to lobe error, and then will affect electricity
The metering accuracy of energy measurement instrument.
It can be seen that how to overcome traditional electric system electric signal measurement mode, caused measurement accuracy is low to be asked
Topic is those skilled in the art's urgent problem to be solved.
Summary of the invention
The embodiment of the present application provides a kind of electric power signal synchronous sampling system and method, traditional in the prior art to solve
Electric system electric signal measurement mode, the low problem of caused measurement accuracy.
In order to solve the above technical problems, the present invention provides a kind of electric power signal synchronous sampling systems, comprising:
Mutual inductor, controller, A/D conversion chip, phaselocked loop and shaping circuit；
The shaping circuit is connect with the mutual inductor and the phaselocked loop respectively, for what will be converted through the mutual inductor
Tested electric signals are modified, and revised tested electric signals are sent to the phaselocked loop with export with it is described revised
Sampled signal of the tested electric signals with frequency；
The controller is connect with the phaselocked loop and the A/D conversion chip respectively, the A/D conversion chip with it is described
Mutual inductor connection, for according to the sampled signal control the A/D conversion chip signal zero-crossing will be through the mutual inductor
The tested electric signals of conversion are converted to digital signal to synchronize sampling to the tested electric signals converted through the mutual inductor.
Preferably, further includes:
The display module connecting with the controller, the display module is for showing the digital signal.
Preferably, further includes:
The multiway analog switch being connect with the mutual inductor, the shaping circuit and the controller, the multi-channel analog
Switch is for switching to objective circuit for current circuit.
Preferably, further includes:
The wireless communication module connecting with the controller, the wireless communication module is for carrying out the digital signal
Wireless transmission.
Preferably, the wireless communication module is specially WIFI module and/or bluetooth module.
Preferably, the phaselocked loop is specially 74VHC4046 phaselocked loop.
Preferably, the A/D conversion chip is specially AD7656 modulus conversion chip.
Preferably, the display module is specially LED display.
Preferably, the voltage-stabiliser tube that the shaping circuit specifically includes operational amplifier and connect with the operational amplifier.
In order to solve the above technical problems, the present invention also provides a kind of electric power corresponding with electric power signal synchronous sampling system
Signal synchronous sampling method is based on any one of the above electric power signal synchronous sampling system, comprising:
Receive phaselocked loop send sampled signal, wherein the frequency of the sampled signal by with through mutual inductor conversion and it is whole
The frequency of tested electric signals after shape circuit modifications determines；
The tested electricity that will be converted through the mutual inductor according to sampled signal control A/D conversion chip in signal zero-crossing
Signal is converted to digital signal to synchronize sampling to the tested electric signals converted through the mutual inductor.
Compared with the prior art, a kind of electric power signal synchronous sampling system provided by the present invention, including mutual inductor, control
Device, A/D conversion chip, phaselocked loop and shaping circuit；On the one hand, after tested electric signals are converted through mutual inductor, Ke Yijing
The shaping circuit connecting with mutual inductor is modified the tested electric signals of conversion, then sends revised tested electric signals
To the phaselocked loop being connect with shaping circuit, it is therefore an objective to which output is with revised tested electric signals with the sampled signal of frequency, it is ensured that quilt
Survey the frequency synchronism of electric signal and sampled signal；On the other hand, the controller connecting with phaselocked loop and A/D conversion chip can be according to
The tested electric signals converted through mutual inductor are converted into digital letter in signal zero-crossing according to sampled signal control A/D conversion chip
Number, it can be further assured that the frequency synchronism of tested electric signals and sampled signal.Therefore, system, it is ensured that tested telecommunications
Frequency synchronism number with sampled signal avoids the occurrence of leakage errors, meets national error criterion requirement, improves electric signal measurement
Accuracy, and then improve the metering accuracy of electric energy metering device.It is adopted in addition, being synchronized the present invention also provides a kind of electric power signal
Quadrat method, effect are as above.
Detailed description of the invention
Fig. 1 is a kind of electric power signal synchronous sampling system structural schematic diagram provided by the embodiment of the present invention；
Fig. 2 is a kind of electric power signal synchronous sampling system overall structure diagram provided by the embodiment of the present invention；
Fig. 3 is a kind of electric power signal synchronous sampling method flow chart provided by the embodiment of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art without making creative work it is obtained it is all its
Its embodiment, shall fall within the protection scope of the present invention.
Core of the invention is to provide a kind of electric power signal synchronous sampling system and method, can solve and passes in the prior art
The electric system electric signal measurement mode of system, the low problem of caused measurement accuracy.
Scheme in order to enable those skilled in the art to better understand the present invention, with reference to the accompanying drawing and specific embodiment party
The present invention is described in further detail for formula.
Fig. 1 is a kind of electric power signal synchronous sampling system structural schematic diagram provided by the embodiment of the present invention, such as Fig. 1 institute
Show, which includes:
Mutual inductor 101, controller 102, A/D conversion chip 103, phaselocked loop 104 and shaping circuit 105；
Shaping circuit 105 is connect with mutual inductor 101 and phaselocked loop 104 respectively, tested for what will be converted through mutual inductor 101
Electric signal is modified, and revised tested electric signals are sent to phaselocked loop 104 to export and revised tested telecommunications
Number with frequency sampled signal；
Controller 102 is connect with phaselocked loop 104 and A/D conversion chip 103 respectively, A/D conversion chip 103 and mutual inductor
101 connections are tested for controlling A/D conversion chip 103 according to sampled signal what signal zero-crossing will be converted through mutual inductor 101
Electric signal is converted to digital signal to synchronize sampling to the tested electric signals converted through mutual inductor 101.
The allowable error of electric system frequency of supply under normal circumstances, power grid dress are defined in national " power supply and business rules "
For machine capacity 3,000,000 or more, allowable error is ± 0.2HZ；Installed capacity in power grid is below 3,000,000, and allowable error is
±0.5HZ；Frequency of supply allowable error is ± 1.0HZ under electric system abnormal condition.So once wave occurs for mains frequency
Dynamic, the period of traditional timing sampling will deviate with power grid actual cycle, the accumulation of this periodicity asynchronous error
It will lead to serious lobe error.And then it will lead to that electric signal measurement accuracy is low, and then influence the metering of electric energy metering device
Accuracy.
Electric power signal synchronous sampling system provided by the embodiments of the present application, including mutual inductor 101, controller 102, A/D turn
Change chip 103, phaselocked loop 104 and shaping circuit 105；Preferably embodiment, shaping circuit 105 specifically include operation
Amplifier and the voltage-stabiliser tube being connect with operational amplifier.It specifically, is exactly to cooperate voltage-stabiliser tube to realize to quilt by operational amplifier
Survey electric signal be modified, obtain amplitude and electric current meet chip input standard signal, but the frequency of tested electric signals according to
It is so fluctuation.For details, reference can be made to existing skills for the realization principle of the shaping circuit 105 of the composition of operational amplifier cooperation voltage-stabiliser tube
Art, details are not described herein by the present invention.
Mutual inductor 101 selects micro mutual inductor in application embodiment, and shaping circuit 105 selects sine/square wave shaping electricity
Road, A/D conversion chip 103 are multi-channel A/D-module.To the specific sampling process of electric power tested electric signals are as follows: returned from electric grid secondary
The tested electric signals (voltage, electric current) of road acquisition are converted into the ac voltage signal (quilt of ± 5V He ± 3V by mutual inductor 101
Survey electric signal) after, enter sampling and quantization that A/D conversion chip 103 carries out signal all the way, A/D turns in the embodiment of the present application
Change the A/D conversion chip that chip 103 selects six analog channel.Wherein, in-phase current connects A/D conversion chip 103 with voltage
A pair of of interface, convenient for synchronous conversion with read data.Enter the shaped circuit of shaping circuit 105 105 all the way to alternating voltage
Signal is modified, and the tested electric signals of sine wave are specially converted to the identical square wave of frequency, inputs phaselocked loop 104, is led to
Phaselocked loop 104 is crossed by the Frequency Locking of tested electric signals, exports sampled signal, the two phase difference is 180 °, it is ensured that output is adopted
The frequency synchronism of sample signal and tested electric signals.For shaping circuit 105 for details, reference can be made to the prior art, the present invention is no longer superfluous herein
It states.
In the embodiment of the present application, by mutual inductor 101 convert tested electric signals can be shaped circuit 105 be converted to
Then the square wave of tested electric signals same frequency is exported to phaselocked loop 104, phaselocked loop 104 carries out Frequency Locking, output and tested electricity
The sampled signal of signal same frequency, in practical applications, the frequency for the sampled signal that phaselocked loop 104 exports are tested electric signals frequencies
256 frequencys multiplication of rate, but be not limited to that 256 frequencys multiplication, the sampled signal that phaselocked loop 104 exports is used to carry out tested electric signals
Sampling；The controller 102 finally connecting with phaselocked loop 104 and A/D conversion chip 103 is believed according to the sampling that phaselocked loop 104 is sent
Number control A/D conversion chip 103 works, it is therefore an objective to the sampled signal for sending A/D conversion chip 103 according to controller 102 with
Control signal keep sampled signal synchronous in the zero crossing of signal with measured signal, i.e., signal zero-crossing will be 101 turns through mutual inductor
The tested electric signals changed are converted to digital signal, and then realize the synchronized sampling to tested electric signals.Specifically, phaselocked loop 104
The frequency multiplication sampled signal of output is input to the I/O mouth of controller 102, and controller 102 is A/D conversion chip according to sampled signal
103 provide control signal.Controller 102 controls A/D conversion chip 103 by CONVST pin, makes six road A/D conversion chips
103 synchronize sampling, can be acquired simultaneously to six road three-phase signals, complete three-phase current, 256 points of voltage each cycle
Sampling operation.That is, the control instruction that A/D conversion chip 103 can be sent according to controller 102 adjusts sampling frequency in real time
Rate realizes high-precision analog-to-digital conversion in signal zero-crossing.In practical application, controller 102 is that A/D conversion chip 103 mentions
For~CS chip selection signal and RD signal, the digital signal after A/D conversion chip 103 is converted is read, and calculates realtime power.Consider
Conveniently related data is checked to the later period, the digital signal and controller 102 after can converting A/D conversion chip 103 calculate
Correlated results store into memory module, memory module can select Flash memory module.
Preferably embodiment, phaselocked loop 104 can select 74VHC4046 phaselocked loop, 74VHC4046 phaselocked loop frequency
Rate locking is high-efficient, and maximum output frequency is 12MHz (Vcc=4.5).Preferably embodiment, A/D conversion chip 103
Specially AD7656 modulus conversion chip, AD7656 modulus conversion chip analog-to-digital conversion are high-efficient.Control in the application implementation
Device 102 can select ARM1020E controller, and ARM1020E controller data processing speed is very fast.Certainly, phaselocked loop 104, A/D
The concrete model of conversion chip 103 and controller 102 is not limited to the model in the application implementation, in practical applications,
Other satisfactory models can also be selected, the present invention is simultaneously not construed as limiting.
A kind of electric power signal synchronous sampling system provided by the present invention, including mutual inductor, controller, A/D conversion chip,
Phaselocked loop and shaping circuit；It on the one hand, can be whole through what is connect with mutual inductor after tested electric signals are converted through mutual inductor
Shape circuit is modified the tested electric signals of conversion, is then sent to revised tested electric signals and connect with shaping circuit
Phaselocked loop, it is therefore an objective to output with revised tested electric signals with frequency sampled signal, it is ensured that tested electric signals and sampling believe
Number frequency synchronism；On the other hand, the controller connecting with phaselocked loop and A/D conversion chip can be controlled according to the sampled signal
The tested electric signals converted through mutual inductor are converted to digital signal in signal zero-crossing by A/D conversion chip, can be further assured that
The frequency synchronism of tested electric signals and sampled signal.Therefore, system, it is ensured that the frequency of tested electric signals and sampled signal
Rate synchronism avoids the occurrence of leakage errors, meets national error criterion requirement, improves electric signal measurement accuracy, and then improve
The metering accuracy of electric energy metering device.
The digital signal after the conversion of A/D conversion chip 103 is checked in time for the ease of related personnel, in above-described embodiment
On the basis of, preferably embodiment, further includes:
The display module connecting with controller 102, display module is for showing digital signal.It is convenient in view of what is used
Property, it is preferable that display module can select LED display.
In order to avoid the input of phaselocked loop 104 occurs the problem of losing sampling open-phase in failure, system reliability is improved.Upper
On the basis of stating embodiment, preferably embodiment, further includes:
The multiway analog switch connecting with mutual inductor 101, shaping circuit 105 and controller 102, multiway analog switch are used for
Current circuit is switched into objective circuit.It is more particularly as the input terminal for the output end connection multiway analog switch for being mutual inductor 101
The output end of path analoging switch is connect with the input terminal of shaping circuit 105, the control terminal of controller 102 and multiway analog switch
Multi-channel input connection, uses multiway analog switch chip as switch method of remote signal, controls analog switch by controller 102
Output.When controller 102 judges 104 output error of phaselocked loop or no signal, under control multiway analog switch switching all the way,
Currently objective circuit will be switched to by circuit.Multiway analog switch can select eight road mould of HCF4051 in the embodiment of the present application
Quasi- switching device.
In order to realize the wireless transmission of digital signal that A/D conversion chip 103 is converted out, such as it is uploaded to mobile device
Deng, on the basis of the above embodiments, preferably embodiment, further includes:
The wireless communication module connecting with controller 102, wireless communication module is for digital signal to be wirelessly transferred.
The problem of in view of hardware cost and property easy to use, preferably embodiment, wireless communication module are specially WIFI
Module and/or bluetooth module.Certainly, wireless communication module can also select other satisfactory modules, and the present invention does not make
It limits.
In order to reference to the accompanying drawing, be carried out to this programme detailed to make those skilled in the art more fully understand this programme
Explanation.Fig. 2 is a kind of electric power signal synchronous sampling system overall structure diagram provided by the embodiment of the present invention, such as Fig. 2 institute
Show, including mutual inductor 101；HCF4051 chip 201, HCF4051 chip 201 are exactly eight path analoging switch；Sine/square wave shaping
Circuit 202；74VHC4046 chip 203 is exactly phaselocked loop 104；AD7656 chip 204, AD7656 chip 204 are exactly A/D conversion
Chip 103；ARM1020E 205, ARM1020E 205 is exactly controller 102 and Flash memory chip 206.In practical application
In, generally requiring sample frequency is 5-10 times of original signal.Consider the requirement measured to harmonic wave, it is desirable to be able to measure 2~21
Rd harmonic signal, therefore sample frequency should be at least 50 × 21 × 5=5.25KHz, it is also contemplated that be stayed for analog-digital converter
Certain conversion time out, therefore set sample frequency as 12.8KHz, i.e. 256 points of each cycle.According to this design, 74VHC4046
The reference signal that the output of voltage controlled oscillator in chip 203 generates after the frequency dividing of programmable logic device 256, locks when entering
When determining state, the frequency of output signal is exactly 256 times of input signal, by the I/O of sampled signal input ARM1020E 205
Mouthful.
AD7656 chip 204 carries out modulus to six road signals according to the sampled signal and control signal of ARM1020E 205 and turns
It changes.Six 16bit built in the AD7656 chip 204 selected in the embodiment of the present application quickly, low-power consumption, throughput rate is reachable
250kSPS can handle highest 12MHz input frequency.Six road 50Hz signal each cycles need to sample 256 in the embodiment of the present application
Point, i.e. sampling rate should be 76.8kSPS, therefore 204 chip of AD7656 chip can satisfy design requirement.Conversion is acquired with data
Process is controlled using the CONVST pin of ARM1020E 205, such as the CONVST in Fig. 2A、CONVSTB、CONVSTC, will
CONVSTA、CONVSTB、CONVSTCThree pins connect together, and can permit three pairs of AD7656 chips 204 and synchronize sampling,
To realize the acquisition to six road three-phase signals.As three CONVSTA、CONVSTB、CONVSTCWhen pin is lower simultaneously, need
Six read operations obtain transformation result from V1-V6, and transformation result is exported with ascending order.Wherein V1, V2 be A phase current, voltage (i.e.
TA, UA), V3, V4 are B phase current, voltage (i.e. TB, UB), and V5, V6 are C phase current, voltage (TC, UC).Through 101 turns of mutual inductor
Become ac voltage signal after changing, is followed successively by U'IA, U'UA, U'IB, U'UB, U'IC, U'UC.
ARM1020E 205 is that AD7656 chip 204 provides~CS chip selection signal and RD signal, completes three-phase current, voltage
The sampling operation that 256 points of each cycle.The frequency of~CS and RD should be not less than 6 times, i.e. 76.8kHz of sampling signal frequency, otherwise
6 tunnel change datas can not be run through, it is contemplated that the factors such as conversion time may be configured as 80kHZ.16 parallel-by-bits of AD7656 chip 204
Output is connect with 16 I/O mouthfuls of ARM1020E 205, reading change data, and passes through I/O mouthfuls of write-in Flash memory chips
206。
It is described in detail above for a kind of embodiment of electric power signal synchronous sampling system, is based on above-mentioned implementation
A kind of electric power signal synchronous sampling system of example description, the embodiment of the invention also provides a kind of electric power corresponding with the system to believe
Number synchronous sampling method.Since the embodiment of method part is corresponded to each other with the embodiment of components of system as directed, because of the method part
Embodiment please refers to the embodiment description of components of system as directed, and which is not described herein again.
Fig. 3 is a kind of electric power signal synchronous sampling method flow chart provided by the embodiment of the present invention, as shown in figure 3, base
The electric power signal synchronous sampling system provided by any one above-mentioned embodiment, method includes the following steps:
S301: receive phaselocked loop send sampled signal, wherein the frequency of sampled signal by with through mutual inductor conversion and it is whole
The frequency of tested electric signals after shape circuit modifications determines；
S302: the tested telecommunications that will be converted through mutual inductor according to sampled signal control A/D conversion chip in signal zero-crossing
Number digital signal is converted to synchronize sampling to the tested electric signals converted through mutual inductor.
A kind of electric power signal synchronous sampling method provided by the present invention, on the one hand, tested electric signals turn through mutual inductor
It after changing, can be modified through the shaping circuit being connect with mutual inductor, the phaselocked loop connecting with shaping circuit exports and through mutual inductance
Device converts the sampled signal equal with the frequency of the revised tested electric signals of shaping circuit, it is ensured that tested electric signals and sampling
The frequency synchronism of signal；On the other hand, controller can control A/D conversion chip according to the sampled signal and incite somebody to action in signal zero-crossing
Tested electric signals are converted to digital signal, can be further assured that the frequency synchronism of tested electric signals and sampled signal.Therefore, should
Method can guarantee the frequency synchronism of tested electric signals and sampled signal, avoid the occurrence of leakage errors, improve electric signal measurement
Accuracy, and then improve the metering accuracy of electric energy metering device.
A kind of electric power signal synchronous sampling system provided by the present invention and method are described in detail above.Herein
Middle with several examples, principle and implementation of the present invention are described, and the explanation of above embodiments is only intended to help
Assistant solves method and its core concept of the invention；At the same time, for those skilled in the art, think of according to the present invention
Think, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification should not be construed as pair
Limitation of the invention, those skilled in the art, under the premise of no creative work, to the present invention made modification, etc.
With replacement, improvement etc., should be included in the application.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One operation is distinguished with another operation, without necessarily requiring or implying there are any between these entities or operation
This actual relationship or sequence.Moreover, the similar word such as term " includes ", so that including the unit of a series of elements, equipment
Or system not only includes those elements, but also including other elements that are not explicitly listed, or further includes for this list
Member, equipment or the intrinsic element of system.
Claims (10)
1. a kind of electric power signal synchronous sampling system characterized by comprising
Mutual inductor, controller, A/D conversion chip, phaselocked loop and shaping circuit；
The shaping circuit is connect with the mutual inductor and the phaselocked loop respectively, tested for what will be converted through the mutual inductor
Electric signal is modified, and revised tested electric signals are sent to the phaselocked loop with export with it is described revised tested
Sampled signal of the electric signal with frequency；
The controller is connect with the phaselocked loop and the A/D conversion chip respectively, the A/D conversion chip and the mutual inductance
Device connection will be converted for controlling the A/D conversion chip according to the sampled signal in signal zero-crossing through the mutual inductor
Tested electric signals be converted to digital signal to synchronize sampling to the tested electric signals converted through the mutual inductor.
2. electric power signal synchronous sampling system according to claim 1, which is characterized in that further include:
The display module connecting with the controller, the display module is for showing the digital signal.
3. electric power signal synchronous sampling system according to claim 1, which is characterized in that further include:
The multiway analog switch being connect with the mutual inductor, the shaping circuit and the controller, the multiway analog switch
For current circuit to be switched to objective circuit.
4. electric power signal synchronous sampling system according to claim 1, which is characterized in that further include:
The wireless communication module connecting with the controller, the wireless communication module are used to carry out the digital signal wireless
Transmission.
5. electric power signal synchronous sampling system according to claim 4, which is characterized in that the wireless communication module is specific
For WIFI module and/or bluetooth module.
6. electric power signal synchronous sampling system according to claim 1, which is characterized in that the phaselocked loop is specially
74VHC4046 phaselocked loop.
7. electric power signal synchronous sampling system according to claim 1, which is characterized in that the A/D conversion chip is specific
For AD7656 modulus conversion chip.
8. electric power signal synchronous sampling system according to claim 2, which is characterized in that the display module is specially
LED display.
9. according to claim 1 to electric power signal synchronous sampling system described in 8 any one, which is characterized in that the shaping
The voltage-stabiliser tube that circuit specifically includes operational amplifier and connect with the operational amplifier.
10. a kind of electric power signal synchronous sampling method, is synchronized based on electric power signal described in claim 1 to 9 any one and is adopted
Sample system characterized by comprising
Receive the sampled signal that phaselocked loop is sent, wherein the frequency of the sampled signal by with it is electric through mutual inductor conversion and shaping
The frequency of the revised tested electric signals in road determines；
The tested electric signals that will be converted through the mutual inductor according to sampled signal control A/D conversion chip in signal zero-crossing
Digital signal is converted to synchronize sampling to the tested electric signals converted through the mutual inductor.
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Application publication date: 20190101 |