CN206684220U - Ac signal acquisition circuit - Google Patents
Ac signal acquisition circuit Download PDFInfo
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- CN206684220U CN206684220U CN201720074391.0U CN201720074391U CN206684220U CN 206684220 U CN206684220 U CN 206684220U CN 201720074391 U CN201720074391 U CN 201720074391U CN 206684220 U CN206684220 U CN 206684220U
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Abstract
The application provides a kind of ac signal acquisition circuit, including：Signal acquisition module, for gathering AC signal, it includes：AC signal converting unit, including D.C mutual-inductor, D.C mutual-inductor connection live wire and zero line；Waveform shift cells up, for moving up the overall waveform setting value of AC signal；Load unit is sampled, the sampled value of the AC signal for adjusting the output of ac signal acquisition branch road, samples the first end of the input connection D.C mutual-inductor of load unit, wherein, the resistance of sampling resistor is adjusted to adjust the sampled value of AC signal；Alternating current signal detection module, for comparative result will to be exported to be provided as the reference of the resistance of the sampling resistor of regulation sampling load unit to cause the precision of the sampled value of AC signal higher.The application can reduce the error for causing sampling precision because of increasing for device, and reduce production difficulty and production cost, reduce power consumption, can also realize the control of precision.
Description
Technical field
The application is related to fire-fighting equipment Power Supply Monitoring field, more particularly to a kind of ac signal acquisition circuit.
Background technology
In the prior art, can be run well at crucial moment for guarantee fire-fighting equipment, therefore, to assure that equipment power supply is normal.
Therefore, the electric power system for fire-fighting equipment needs to monitor constantly, especially exchanges active and standby electric electric power system.At present, market
On Power Supply Monitoring equipment ac signal acquisition circuit major way be：The AC signal of forceful electric power is changed into D.C mutual-inductor
The AC signal of safety, then amplified signal with amplifier, enter MCU after then being handled using RMS-DC chips (such as AD536A)
Carry out AD acquisition testings (or using electric energy metrical IC processing).
With the ac signal acquisition circuit precision of upper type as circuit increases error increase, the device precision of amplifier part
It is particularly sensitive, if from improper, it is easy to the situation that uniformity differs greatly occur in production, and discharge circuit generally needs
To use positive and negative power voltage supply, circuit complexity.In addition, as AC signal way increases, number of devices accordingly increases, device
Cost and cloth plate suqare are also multiplied, and power consumption also increases.
Utility model content
The application provides a kind of ac signal acquisition circuit, can be in the circuit for solving present ac signal acquisition circuit
Structure with the circuit of collection increase and cause sampling precision error increase and add production difficulty, production cost and
The problem of power consumption.
According to the application's in a first aspect, the application provides a kind of ac signal acquisition circuit, ac signal acquisition circuit
Including：An at least signal acquisition module and the alternating current signal detection module for connecting ac signal acquisition branch road；Exchange letter
Number acquisition module, for gathering AC signal, it includes：AC signal converting unit, believe for the forceful electric power received to be exchanged
Number safe AC signal is converted into, it includes D.C mutual-inductor, and the both ends of the armature winding of D.C mutual-inductor connect fire respectively
Line and zero line；Waveform shift cells up, for moving up the overall waveform setting value of AC signal, it includes input and output end,
The first end of the secondary windings of the input connection D.C mutual-inductor of waveform shift cells up；Load unit is sampled, is handed over for adjusting
The sampled value of the AC signal of signal acquisition branch road output is flowed, it includes input, output end and sampling resistor, sampling resistor
It is connected between input and the output end of sampling load unit, samples the of the input connection D.C mutual-inductor of load unit
One end, wherein, the resistance of sampling resistor is adjusted to adjust the sampled value of AC signal；Alternating current signal detection module, for that will set
The sampled value collected in fixing time carries out processing statistics and draws output valve, and compares output valve and sampled value, and output is compared
As a result to be provided as the reference of the resistance of the sampling resistor of regulation sampling load unit to cause the essence of the sampled value of AC signal
Du Genggao.
Preferably, AC signal converting unit includes：Be connected on the both ends of the armature winding of D.C mutual-inductor and live wire and
Current-limiting resistance between zero line.
Preferably, waveform shift cells up includes：First electric capacity, the second electric capacity, first resistor and second resistance, the first electricity
Appearance is connected to so that between the output end of power supply and waveform shift cells up, the second capacitance connection is in the defeated of waveform shift cells up
Go out between end and ground, first resistor is in parallel with the first electric capacity, and second resistance is connected to the input and ground of waveform shift cells up
Between.
Preferably, sampling load unit includes the first sampling resistor, the second sampling resistor and the 3rd sampling resistor, and second
Sampling resistor and the 3rd sampling resistor be connected to sampling load unit input and output end between, the first sampling resistor with
Second sampling resistor and the 3rd sampling resistor are in parallel.
Preferably, sampling load unit also includes being used for the 3rd resistor for avoiding D.C mutual-inductor internal resistance from influenceing, the 3rd electricity
Resistance is connected to the second end of the input of sampling load unit and the secondary windings of D.C mutual-inductor.
Preferably, sampling load unit also includes being used for the two-way TVS pipe for protecting internal circuit, and two-way TVS pipe is connected to
The both ends of the secondary windings of D.C mutual-inductor.
Preferably, signal acquisition module also includes filter unit, and filter unit is used for smooth AC signal, and it includes
Input and output end, the output end of the input connection sampling load unit of filter unit, the output end connection of filter unit
Alternating current signal detection module.
Preferably, filter unit includes the 4th resistance, the 3rd electric capacity and the 4th electric capacity, and it is single that the 4th resistance is connected to filtering
The input and output end of member, between the input and ground of filter unit, the 4th capacitance connection is filtering the 3rd capacitance connection
Between the output end and ground of unit.
Preferably, alternating current signal detection module includes：Statistic unit, for the statistic sampling time whether in setting time
It is interior；Computing unit, its connection statistics unit, for when the sampling time is in setting time, by the sampled value of AC signal with
Setting value is compared, and by the absolute value of sampled value and the difference of setting value divided by setting coefficient to retain number of significant digit, then will
The value obtained after being divided by is added up；Judging unit, it connects computing unit, for whether judging the sampled value after cumulative
Effectively；Output unit, its connection judgment unit, if effective for sampled value after treatment, output is output valve；Than
Compared with unit, it connects output unit, for comparing sampled value and output valve, and exports comparative result.
Preferably, when applying in the alternating current signal detection of three-phase and four-line voltage, circuit includes three ac signal acquisition moulds
Block, wherein the sampling of the current-limiting resistance of the AC signal converting unit of signal acquisition module and sampling load unit all the way
The resistance of resistance is less than the current-limiting resistance of the AC signal converting unit of remaining two-way signal acquisition module and sampling is born
The resistance of the sampling resistor of carrier unit.
The beneficial effect of the application is：The collection of AC signal is realized by less peripheral components, and can be given
The sampling precision of circuit provides regulation reference, this makes it possible to reduce the error that causes sampling precision because of increasing for device,
And production difficulty and production cost are reduced, reduces power consumption, the control of precision can also be realized.
Brief description of the drawings
Fig. 1 is a kind of principle of the signal acquisition module for the ac signal acquisition circuit for implementing to exemplify of the application
Figure；
Fig. 2 is a kind of principle of the alternating current signal detection module for the ac signal acquisition circuit for implementing to exemplify of the application
Figure；
Fig. 3 is that a kind of sinusoidal signal for implementing to exemplify of the application moves up and sampling schematic diagram；
Fig. 4 is a kind of flow chart for the alternating current signal detection for implementing to exemplify of the application；
Fig. 5 is a kind of schematic diagram applied in three-phase and four-line ac signal acquisition for implementing to exemplify of the application.
Reference is illustrated below：The D.C mutual-inductor B5 of signal acquisition module AC signal converting unit 11
The second electric capacity of electric capacity C8 of current-limiting resistance R51 current-limiting resistance R52 current-limiting resistance R98 current-limiting resistance R99 waveforms shift cells up 12 first
C9 first resistor R16 second resistances R22 sampling load units 13 first the second sampling resistors of sampling resistor R78 R71 the 3rd is sampled
The two-way electric capacity C24 of the 4th the 3rd electric capacity C23 of resistance R38 of TVS pipe D5 filter units 14 the 4th exchanges of resistance R41 3rd resistors R40
Signal detection module.
Embodiment
The application is described in further detail below by embodiment combination accompanying drawing.Wherein different embodiments
Middle similar component employs associated similar element numbers.In the following embodiments, many detailed descriptions be in order to
The application is better understood.However, those skilled in the art can be without lifting an eyebrow recognize, which part feature
It is dispensed, or can be substituted by other elements, material, method in varied situations.In some cases, this Shen
Certain operations that please be related are not shown in the description or description, and this is the core in order to avoid the application by mistake
More descriptions are flooded, and to those skilled in the art, be described in detail these associative operations be not it is necessary, they
The general technology knowledge of description and this area in specification can completely understand associative operation.
In addition, feature described in this description, operation or feature can combine to form respectively in any suitable way
Kind embodiment.Meanwhile each step in method description or action can also can be aobvious and easy according to those skilled in the art institute
The mode carry out order exchange or adjustment seen.Therefore, the various orders in specification and drawings are intended merely to clearly describe a certain
Individual embodiment, necessary order is not meant to be, wherein some sequentially must comply with unless otherwise indicated.
In the utility model embodiment, the collection of AC signal is realized by less peripheral components, and can give
The sampling precision of circuit provides regulation reference, can reduce the error for causing sampling precision because of increasing for device, and drop
Low production difficulty and production cost, reduce power consumption, can also realize the control of precision.
Fig. 1 and Fig. 2, a kind of ac signal acquisition circuit are referred to, circuit includes：An at least signal acquisition module with
And the alternating current signal detection module of connection ac signal acquisition branch road.
Signal acquisition module, for gathering AC signal, it includes：AC signal converting unit 11, waveform move up
Unit 12, sampling load unit 13 and filter unit 14.Alternating current signal detection module, for will collect in setting time
Sampled value carries out processing statistics and draws output valve, and compares output valve and sampled value, exports comparative result to be provided as adjusting
The reference of the resistance of the sampling resistor of load unit 13 is sampled to cause the precision of the sampled value of AC signal higher, it includes system
Count unit, computing unit, judging unit, output unit and comparing unit.
AC signal converting unit 11, for the forceful electric power received AC signal to be converted into safe AC signal, its
Including D.C mutual-inductor, the both ends of the armature winding of D.C mutual-inductor connect live wire and zero line respectively.Waveform shift cells up 12, use
In the overall waveform setting value for moving up AC signal, it includes input and output end, and the input of waveform shift cells up 12 connects
Connect the first end of the secondary windings of D.C mutual-inductor.Load unit 13 is sampled, for adjusting the output of ac signal acquisition branch road
The sampled value of AC signal, it includes input, output end and sampling resistor, and sampling resistor is connected to sampling load unit 13
Input and output end between, the input connection D.C mutual-inductor B5 of sampling load unit 13 first end, wherein, regulation
The resistance of sampling resistor is to adjust the sampled value of AC signal.Filter unit 14 is used for smooth AC signal, and it includes input
And output end, the output end of the input connection sampling load unit 13 of filter unit 14, the output end connection of filter unit 14
Alternating current signal detection module.
Statistic unit, for the statistic sampling time whether in setting time.Computing unit, its connection statistics unit, use
In when the sampling time is in setting time, by the sampled value of AC signal compared with setting value, and by sampled value with setting
The absolute value of the difference of definite value divided by setting coefficient are to retain number of significant digit, then the value obtained after being divided by is added up.Judge single
Member, it connects computing unit, for judging whether the sampled value after cumulative is effective.Output unit, its connection judgment unit,
If effective for sampled value after treatment, output is output valve.Comparing unit, its connect output unit, for than
Compared with sampled value and output valve, and export comparative result.
AC signal converting unit 11 includes：It is connected between one end and the live wire of D.C mutual-inductor B5 armature winding
Current-limiting resistance R52, current-limiting resistance R51, the current limliting electricity being connected between one end of D.C mutual-inductor B5 armature winding and zero line
Hinder R98, current-limiting resistance R99.In the present embodiment, D.C mutual-inductor B5 is used to isolate high pressure to internal circuit influence, believes to ensure
Number precision, the present embodiment preferentially select 0.2% precision voltage transformer.Voltage signal is switched to electric current letter by current-limiting resistance
Number, the resistance of current-limiting resistance is 47K Ω, and precision is the wafer resistance that 1%, power is 1W, can play and avoid because of electricity
The problem of resistance is generated heat and influences precision.
Fig. 1 and Fig. 3 are referred to, waveform shift cells up 12 includes：First electric capacity C8, the second electric capacity C9, first resistor R16 with
And second resistance R22, the first electric capacity C8 are connected to between the output end of power supply and waveform shift cells up 12, the second electricity
Hold C9 to be connected between output end and the ground of waveform shift cells up 12, first resistor R16 is in parallel with the first electric capacity C8, second resistance
R22 is connected between the input and ground of waveform shift cells up 12.In the present embodiment, the first electric capacity C8 and the second electric capacity C9 electricity
The resistance value that capacitance is 100 μ, first resistor R16 and second resistance R22 is 5.1K Ω, first resistor R16 and second
Resistance R22 precision is 1%.In the present embodiment, setting value that waveform shift cells up 12 moves up the overall waveform of AC signal
VCC/2 is arranged to, waveform moves up the device that divider resistance selects precision 0.1% herein, it can be ensured that datum is accurate, after being
Continuous software judges to provide hardware supported.
Sampling load unit 13 includes the first sampling resistor R78, the second sampling resistor R71, the 3rd sampling resistor R41, the
Three resistance R40 and two-way TVS pipe D5.Second sampling resistor R71 and the 3rd sampling resistor R41 are connected to sampling load unit
Between 13 input and output end, the first sampling resistor R78 and the second sampling resistor R71 and the 3rd sampling resistor R41 are simultaneously
Connection.3rd resistor R40 is connected to the second end of the input of sampling load unit 13 and the secondary windings of D.C mutual-inductor.It is double
The both ends of the secondary windings of D.C mutual-inductor are connected to TVS pipe D5.
In the present embodiment, the first resistance sampled is 7.5K Ω, precision 0.1%, and the second sampling resistor R71 resistance is
63.4R Ω, precision 0.5%, the 3rd sampling resistor R41 resistance is 4.7R Ω, precision 1%, and sampling load unit 13 is set
Three resistance string parallel forms are used on meter, facilitate user to match suitable load resistance.
In the present embodiment, 3rd resistor R40 resistance is 10R, precision is that 1% 3rd resistor R40 is used to avoid exchange mutual
Sensor internal resistance influences.
In the present embodiment, two-way TVS pipe D5 is used to protect internal circuit, two-way TVS model SMBJ6.0CA, voltage stabilizing
It is worth for 6V.
Filter unit 14 includes the 4th resistance R38, the 3rd electric capacity C23 and the 4th electric capacity C24.4th resistance R38 connections
In the input and output end of filter unit 14, the 3rd electric capacity C23 is connected between the input and ground of filter unit 14, and the 4th
Electric capacity C24 is connected between output end and the ground of filter unit 14.
In the present embodiment, the 4th resistance R38 resistance is 10K Ω, precision 1%, the first electric capacity C8 and the second electric capacity C9
Model 104, precision 5%, the 4th resistance R38, the 3rd electric capacity C23 and the 4th electric capacity C24 form π shape filter circuits,
Can smooth sampled signal, avoid the interference of ambient noise.
Fig. 2 to Fig. 4 is referred to, alternating current signal detection module can perform RMS-DC algorithms come real by MCU governor circuits
It is existing.Also it is both to be all acquired per AC signal all the way by the MCU passages of AD all the way, then by being transported in MCU governor circuits
Row RMS-DC algorithms realize the processing of AC signal.In the present embodiment, MCU type selecting AD digits are 10bit, and sampling error is +/-
1bit, sample reference voltage VCC, MCU AD passages are more than 6 tunnels, sample frequency 500KHz.
Please continue to refer to Fig. 4, the process that RMS-DC algorithms realize alternating current signal detection is described below in detail.
The first step, setting AC signal frequency are 50Hz, a length of 20ms when setting the sampling of AC signal, start timing
Device.
Second step, in 20ms sampling period, more sampling numbers are obtained as far as possible.By each sampled value compared with 512,
If sampled value is more than VCC/2, AD values are subtracted 512, otherwise, AD values are subtracted with 512, so as to obtain amplitude Vn, then will
Amplitude Vn each time by divided by 32 to retain the amplitude Vn of 6MSB (Most Significant Bit, highest significant position),
Amplitude Vn each time is added up again and obtains output valve Σ AD.
3rd step, when the setting time more than 20ms, by judging the frequency of AC signal whether in 60HZ and 40HZ
Between judge the legitimacies of data, if illegal, then it is assumed that be interference signal, and give up invalid data, if legal, after
It is continuous to judge whether output valve Σ AD are more than 1023, if it is, output Σ AD=1023, otherwise it is assumed that output valve Σ AD positions are effective
Signal, and export output valve Σ AD.
4th step, compares the sampled value of output valve Σ AD and AC signal, and exports comparative result.
If comparative result has larger deviation, the resistance of the sampling resistor of adjustable sampling load unit 13 carries out weight
New matching.Specifically, when output valve Σ AD are more than sampled value, the resistance of sampling resistor is changed it is small, when output valve Σ AD are less than
During sampled value, the resistance of sampling resistor is changed greatly.
Referring to Fig. 5, when ac signal acquisition circuit is applied in three-phase and four-line voltage, the phase electricity of three-phase and four-line is gathered
Pressure, it is acquired per phase voltage all the way as independent ac voltage signal, then three road signals is integrated by MCU governor circuits
Value judges the fault message such as over-pressed, under-voltage, phase shortage, interruption, misphase.
The waveform of three tunnel signal acquisition modules moves up circuit multiplexer, saves circuit space, also avoid different passages because
Reference potential difference causes signal to judge inconsistence problems.
It is worth noting that, the current-limiting resistance of three tunnel phase voltage converting units 11 and the sampling electricity of sampling load unit 13
The resistance of resistance can not be identical, wherein the current-limiting resistance of AC signal converting unit all the way and adopting for sampling load unit
The resistance of sample resistance is less than the current-limiting resistance of the AC signal converting unit of remaining two-way and samples the sampling electricity of load unit
The resistance of resistance, otherwise, when live wire goes offline, three road phase-voltage measurements can become three-route voltage detecting, and cause software without
Method is distinguished.
In the present embodiment, wherein the resistance of current-limiting resistance all the way is 47K Ω, precision is that 1%, power is 1W,
The resistance of the current-limiting resistance of remaining two-way is 100K Ω, and precision is that 1%, power is 1W.
The resistance of the first sampling wherein all the way is 7.5K Ω, precision 0.1%, and the second sampling resistor R71 resistance is
63.4R Ω, precision 0.5%, the 3rd sampling resistor R41 resistance is 4.7R Ω, precision 1%, and the first of remaining two-way adopts
The resistance of sample is 6.2K Ω, precision 0.1%, and the second sampling resistor R71 resistance is 100R Ω, precision 0.1%, and the 3rd adopts
Sample resistance R41 resistance is 47R Ω, precision 0.1%.
Use above specific case is illustrated to the application, is only intended to help and is understood the application, not limiting
The application processed.For the application person of ordinary skill in the field, according to the thought of the application, can also make some simple
Deduce, deform or replace.
Compared with prior art, the beneficial effect of the application is：AC signal is realized by less peripheral components
Collection, and the sampling precision of circuit can be given to provide regulation reference, this makes it possible to reduce to cause because of increasing for device
The error of sampling precision, and production difficulty and production cost are reduced, power consumption is reduced, the control of precision can also be realized.
It will be understood by those skilled in the art that all or part of step of various methods can pass through in above-mentioned embodiment
Program instructs related hardware to complete, and the program can be stored in a computer-readable recording medium, storage medium can wrap
Include：Read-only storage, random access memory, disk or CD etc..
Above content is to combine the further description that specific embodiment is made to the application, it is impossible to assert this Shen
Specific implementation please is confined to these explanations.For the application person of an ordinary skill in the technical field, do not taking off
On the premise of conceiving from the application utility model, some simple deduction or replace can also be made.
Claims (10)
1. a kind of ac signal acquisition circuit, it is characterised in that the ac signal acquisition circuit includes：An at least AC signal
The alternating current signal detection module of acquisition module and the connection ac signal acquisition branch road；
The signal acquisition module, for gathering AC signal, it includes：
AC signal converting unit, for the forceful electric power received AC signal to be converted into safe AC signal, it includes handing over
Current transformer, the both ends of the armature winding of the D.C mutual-inductor connect live wire and zero line respectively；
Waveform shift cells up, for moving up the overall waveform setting value of the AC signal, it includes input and output end, institute
State the first end of the secondary windings of the input connection D.C mutual-inductor of waveform shift cells up；
Load unit is sampled, the sampled value of the AC signal for adjusting the ac signal acquisition branch road output, it includes defeated
Enter end, output end and sampling resistor, the sampling resistor be connected to the sampling load unit input and output end it
Between, the input of the sampling load unit connects the first end of the D.C mutual-inductor, wherein, adjust the sampling resistor
Resistance is to adjust the sampled value of the AC signal；
The alternating current signal detection module, for by the sampled value collected in setting time carry out handle statistics draw it is defeated
Go out value, and compare output valve and sampled value, output comparative result is electric to be provided as adjusting the sampling of the sampling load unit
The reference of the resistance of resistance is higher to cause the precision of the sampled value of the AC signal.
2. ac signal acquisition circuit as claimed in claim 1, it is characterised in that the AC signal converting unit includes：
The current-limiting resistance being connected between the both ends of the armature winding of the D.C mutual-inductor and the live wire and zero line.
3. ac signal acquisition circuit as claimed in claim 1, it is characterised in that the waveform shift cells up includes：First
Electric capacity, the second electric capacity, first resistor and second resistance, first capacitance connection is on power supply and the waveform
To move between the output end of unit, second capacitance connection is between the output end of the waveform shift cells up and ground, and described the
One resistance is in parallel with the first electric capacity, and the second resistance is connected between the input and ground of the waveform shift cells up.
4. ac signal acquisition circuit as claimed in claim 1, it is characterised in that the sampling load unit is adopted including first
Sample resistance, the second sampling resistor and the 3rd sampling resistor, second sampling resistor and the 3rd sampling resistor are connected to institute
Between input and the output end of stating sampling load unit, first sampling resistor and second sampling resistor and the 3rd
Sampling resistor is in parallel.
5. ac signal acquisition circuit as claimed in claim 4, it is characterised in that the sampling load unit also includes being used for
Avoid D.C mutual-inductor internal resistance influence 3rd resistor, the 3rd resistor be connected to it is described sampling load unit input with
And the second end of the secondary windings of the D.C mutual-inductor.
6. ac signal acquisition circuit as claimed in claim 4, it is characterised in that the sampling load unit also includes being used for
The two-way TVS pipe of internal circuit is protected, the two-way TVS pipe is connected to the both ends of the secondary windings of the D.C mutual-inductor.
7. ac signal acquisition circuit as claimed in claim 1, it is characterised in that the signal acquisition module also includes
Filter unit, the filter unit are used for the smooth AC signal, and it includes input and output end, the filter unit
The output end of the input connection sampling load unit, the output end of the filter unit connect the alternating current signal detection mould
Block.
8. ac signal acquisition circuit as claimed in claim 7, it is characterised in that the filter unit include the 4th resistance,
3rd electric capacity and the 4th electric capacity, the 4th resistance are connected to the input and output end of the filter unit, and the described 3rd
Capacitance connection is between the input and ground of the filter unit, output end of the 4th capacitance connection in the filter unit
Between ground.
9. ac signal acquisition circuit as claimed in claim 1, it is characterised in that the alternating current signal detection module includes：
Statistic unit, for the statistic sampling time whether in setting time；
Computing unit, it connects described statistic unit, for when the sampling time is in setting time, by the AC signal
Sampled value is compared with the setting value, and by the absolute value of the sampled value and the difference of setting value divided by setting coefficient to protect
Number of significant digit, then the value obtained after being divided by is stayed to be added up；
Judging unit, it connects the computing unit, for judging whether the sampled value after cumulative is effective；
Output unit, it connects the judging unit, if effective for the sampled value after treatment, output is institute
State output valve；
Comparing unit, it connects the output unit, for the sampled value and output valve, and exports comparative result.
10. ac signal acquisition circuit as claimed in claim 2, it is characterised in that when applying the friendship in three-phase and four-line voltage
When flowing signal detection, the circuit includes three signal acquisition modules, wherein the friendship of the signal acquisition module all the way
The resistance of the current-limiting resistance for flowing signal conversion unit and the sampling resistor for sampling load unit is less than remaining two-way AC signal
The resistance of the current-limiting resistance of the AC signal converting unit of acquisition module and the sampling resistor of sampling load unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720074391.0U CN206684220U (en) | 2017-01-19 | 2017-01-19 | Ac signal acquisition circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720074391.0U CN206684220U (en) | 2017-01-19 | 2017-01-19 | Ac signal acquisition circuit |
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|---|---|
| CN206684220U true CN206684220U (en) | 2017-11-28 |
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| CN201720074391.0U Active CN206684220U (en) | 2017-01-19 | 2017-01-19 | Ac signal acquisition circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707012A (en) * | 2017-01-19 | 2017-05-24 | 深圳市泛海三江电子股份有限公司 | AC signal acquisition circuit |
| CN109521256A (en) * | 2018-12-28 | 2019-03-26 | 合肥市芯海电子科技有限公司 | A kind of small signal deteching circuit and method removing dead zone voltage |
| CN114002486A (en) * | 2021-10-29 | 2022-02-01 | 深圳市泛海三江电子股份有限公司 | Detection method and detection circuit for alternating voltage/current signal |
| US20230324442A1 (en) * | 2020-09-28 | 2023-10-12 | Shanghai Natlinear Electronics Co., Ltd. | Alternating current resistance detection circuit and system |
-
2017
- 2017-01-19 CN CN201720074391.0U patent/CN206684220U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707012A (en) * | 2017-01-19 | 2017-05-24 | 深圳市泛海三江电子股份有限公司 | AC signal acquisition circuit |
| CN109521256A (en) * | 2018-12-28 | 2019-03-26 | 合肥市芯海电子科技有限公司 | A kind of small signal deteching circuit and method removing dead zone voltage |
| US20230324442A1 (en) * | 2020-09-28 | 2023-10-12 | Shanghai Natlinear Electronics Co., Ltd. | Alternating current resistance detection circuit and system |
| US11828778B2 (en) * | 2020-09-28 | 2023-11-28 | Shanghai Natlinear Electronics Co., Ltd. | Alternating current resistance detection circuit and system |
| CN114002486A (en) * | 2021-10-29 | 2022-02-01 | 深圳市泛海三江电子股份有限公司 | Detection method and detection circuit for alternating voltage/current signal |
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