CN205958641U - Current detection circuit - Google Patents
Current detection circuit Download PDFInfo
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- CN205958641U CN205958641U CN201620396648.XU CN201620396648U CN205958641U CN 205958641 U CN205958641 U CN 205958641U CN 201620396648 U CN201620396648 U CN 201620396648U CN 205958641 U CN205958641 U CN 205958641U
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- 238000001514 detection method Methods 0.000 title claims abstract description 39
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- 238000005070 sampling Methods 0.000 claims abstract description 14
- 230000005669 field effect Effects 0.000 claims description 26
- 239000004065 semiconductor Substances 0.000 claims description 22
- 239000002184 metal Substances 0.000 claims description 3
- 150000002927 oxygen compounds Chemical class 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 13
- 238000001914 filtration Methods 0.000 abstract description 6
- 238000012544 monitoring process Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 10
- 230000007812 deficiency Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 230000003321 amplification Effects 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 206010014357 Electric shock Diseases 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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Abstract
The utility model belongs to the electric energy application especially relates to a current detection circuit. The utility model provides a current detection circuit, include: exchangeable translation unit, rectifier unit, filtering unit and AD sampling translation unit, wait that the alternating current that detects passes through in proper order exchangeable translation unit, rectifier unit, filtering unit and AD sampling translation unit. The alternating current of waiting to detect can be realized carrying out the current detection that keeps apart to the higher alternating current of voltage as the commercial power as behind exchangeable translation unit, rectifier unit, filtering unit and AD sampling translation unit, and the conversion of consumption is carried out to the difference of the electric current that obtains according to the calculation that MCU gathers to carry out corresponding control to the circuit, alright realize the intelligent monitoring to electric power system. In having solved prior art, there is the technical defect to the device expects much and measurement accuracy is poor in current detection circuit. And simultaneously, the utility model discloses still has the advantage that security height, low cost and range of application are wide.
Description
Technical field
This utility model belongs to electric energy application, more particularly, to a kind of current detection circuit.
Background technology
With the development in epoch, electric energy using more and more extensive, each family, everyone life are too busy to get away
Electricity, in order to measure the electric energy of our uses, current detecting is essential.The powerful application of One function convenient current detecting electricity
Road is one of a outstanding core of executor, particularly in field of intelligent control, such as smart home or intelligent building, and one
Good current detection circuit can make whole system make something perfect even more perfect, and can make our each region of monitoring system and whole systems at any time
Electricity consumption situation, to carry out Based Intelligent Control and optimization to system, reaches the purpose of power saving.Current detecting is divided into direct current detection
With alternating current detection, wherein alternating current detects that application is relatively broad, usually applies the forceful electric power input in electrical appliance, right
The electric current flowing through electrical appliance is monitored.
In prior art, the testing circuit of AC current is：The precision resistance taking resistance very little is adopted to electric current
Sample, the electric current flowing through loop can produce a small voltage at resistance two ends, then by operational amplifier, institute's sampled voltage is carried out
Amplify, the rectifier bridge being then made up of four diodes again carries out rectification to it, AC signal is converted into unidirectional direct current
Pulsating volage, eventually passes RC filtering and it is carried out be shaped as the DC voltage of chip identification that can be processed.Therefore, prior art
In AC current testing circuit there is following technological deficiency：First, existing testing circuit has high demands to device, due to
The method taken is the method measurement with small resistor sampling, and the requirement to this resistance is higher, and small resistance difference all can
Considerable influence is produced to measurement result, so having to choose precision resistance；According to circuit design demand, operational amplifier also will
Choose the operational amplifier of the support positive and negative twin voltage input of Low Drift Temperature；Second, the certainty of measurement of existing testing circuit is low, temperature
Larger etc. the impact ratio to circuit for the environmental factorss, the impact of sampling resistor heated resistance easily changes, and small change is to circuit
Measurement result impact increase, meanwhile, output voltage will be exported after test sample voltage amplification by operational amplifier, and operational amplifier
There is larger temperature drift, the change of different temperatures can directly influence signal amplification factor, leads to the data finally measuring inclined
Difference is larger, can choose Low Drift Temperature device and reduce error, but unavoidably.In prior art, current detection circuit is primarily present
To the technological deficiency that requirement on devices is high and certainty of measurement is poor.
Therefore, develop a kind of current detection circuit, for solving in prior art, current detection circuit is primarily present
To the technological deficiency that requirement on devices is high and certainty of measurement is poor, become those skilled in the art's problem demanding prompt solution.
Utility model content
In view of this, this utility model embodiment provides a kind of current detection circuit, for solving in prior art, electricity
Current detection circuit has high to requirement on devices and certainty of measurement difference technological deficiency.
This utility model provides a kind of current detection circuit, and described current detection circuit includes：Mutual inductance converting unit, whole
Stream unit, filter unit and AD sample conversion unit；Alternating current to be detected sequentially passes through described mutual inductance converting unit, rectification list
Unit, filter unit and AD sample conversion unit.
Preferably, described mutual inductance converting unit includes：Current transformer and sampling resistor R4；Alternating current to be detected is first
Through described current transformer, then again through described sampling resistor R4.
Preferably, described rectification unit includes：Comparator U1, reverser D1, metal-oxide-semiconductor field effect t D2, metal oxygen
Compound field effect transistor D4, metal-oxide-semiconductor field effect t D3 and metal-oxide-semiconductor field effect t D5；Electric current to be detected through than
Compared with after device U1, metal-oxide-semiconductor field effect t D2 and metal-oxide-semiconductor field effect t D4 forms path one, and metal oxide field is imitated
Pipe D3 and metal-oxide-semiconductor field effect t D5 should form path two, described path one and path two with all with described reverser D1 company
Connect.
Preferably, described rectification unit also includes：Resistance R10 and resistance R12；Alternating current to be detected is flowing through described leading to
Behind road one or path two, flow through described resistance R10 and resistance R12.
Preferably, described filter unit includes：Electric capacity C7, electric capacity C8 and resistance R9；Described electric capacity C7, electric capacity C8 and resistance
R9 combination forms a π type filter circuit.
Preferably, described AD sample conversion unit includes：MCU (microcontroller) and AD conversion unit；Friendship to be detected
Stream electricity, after sequentially passing through described mutual inductance converting unit, rectification unit and filter unit, obtains an analogue signal, described simulation
Signal sequentially passes through MCU sampler and AD converter.
In sum, this utility model provides a kind of current detection circuit, and described current detection circuit includes：Mutual inductance turns
Change unit, rectification unit, filter unit and AD sample conversion unit；It is single that alternating current to be detected sequentially passes through described mutual inductance conversion
Unit, rectification unit, filter unit and AD sample conversion unit.Alternating current to be detected through mutual inductance converting unit, rectification unit,
After filter unit and AD sample conversion unit, can achieve the electric current inspection that the alternating current higher to voltage as civil power is isolated
Survey, gathered the difference of calculated electric current according to MCU, carry out the conversion of power consumption, and circuit is controlled accordingly,
Just can achieve the intelligent monitoring to power system.Solve in prior art, current detection circuit exists high to requirement on devices
And the technological deficiency of certainty of measurement difference.Meanwhile, a kind of current detection circuit that this utility model provides, also has safety
The advantage of high, with low cost and applied range.
Brief description
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or in description of the prior art the accompanying drawing of required use be briefly described it should be apparent that, drawings in the following description are only
It is embodiment of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, also
Other accompanying drawings can be obtained according to the accompanying drawing providing.
A kind of structural representation of current detection circuit that Fig. 1 provides for this utility model.
Specific embodiment
This utility model embodiment provides a kind of current detection circuit, for solving in prior art, current detecting electricity
Road has high to requirement on devices and certainty of measurement difference technological deficiency.
For enabling the purpose of this utility model, feature and advantage more obvious and understandable, below in conjunction with this
Accompanying drawing in utility model embodiment, is clearly and completely described to the technical scheme in this utility model embodiment, shows
So, the embodiments described below are only a part of embodiment of this utility model, and not all embodiment.Based on this practicality
Embodiment in new, all other reality that those of ordinary skill in the art are obtained under the premise of not making creative work
Apply example, broadly fall into the scope of this utility model protection.
Refer to Fig. 1, this utility model provides a kind of current detection circuit, current detection circuit includes：Mutual inductance is changed
Unit, rectification unit, filter unit and AD sample conversion unit；Alternating current to be detected sequentially passes through mutual inductance converting unit, whole
Stream unit, filter unit and AD sample conversion unit.Alternating current to be detected is through mutual inductance converting unit, rectification unit, filtering
After unit and AD sample conversion unit, can achieve the current detecting that the alternating current higher to voltage as civil power is isolated, root
Gathered the difference of calculated electric current according to MCU, carry out the conversion of power consumption, and circuit is controlled accordingly, just may be used
Realize the intelligent monitoring to power system.Solve in prior art, current detection circuit exist high to requirement on devices and
The technological deficiency of certainty of measurement difference.
In this utility model embodiment, mutual inductance converting unit includes：Current transformer and sampling resistor R4；Friendship to be detected
Stream electricity first passes around current transformer, then again through sampling resistor R4.Forceful electric power exchange input, changes after current transformer
For less signal, electric current flows through sampling resistor R4, produces a voltage difference between R4, and this voltage difference is AC signal.
In this utility model embodiment, rectification unit includes：Comparator U1, reverser D1, metal-oxide-semiconductor field effect t
D2, metal-oxide-semiconductor field effect t D4, metal-oxide-semiconductor field effect t D3 and metal-oxide-semiconductor field effect t D5；Electricity to be detected
After comparator U1, metal-oxide-semiconductor field effect t D2 and metal-oxide-semiconductor field effect t D4 forms path one, metal oxygen to stream
Compound field effect transistor D3 and metal-oxide-semiconductor field effect t D5 form path two, path one and path two with all with reverser D1 company
Connect.Rectification unit also includes：Resistance R10 and resistance R12；Alternating current to be detected, after flowing through path one or path two, flows through
Resistance R10 and resistance R12.Comparator U1 serves the effect of voltage ratio relatively output, when AC_IN1 is more than AC_IN2, positive input terminal
When higher than negative input end voltage, it is output as high level, now, the G foot of metal-oxide-semiconductor field effect t D2, D4 is high level, place
In conducting state, because phase inverter D1, metal-oxide-semiconductor field effect t D3, D5 position cut-off state；The conducting of D2 makes AC_
The level of IN2 be equal to U0, U0 be certain value, magnitude of voltage by R10, R12 determine, magnitude of voltage less it is therefore an objective to produce a reference
Level, the conducting of D4 makes Uout0 be equal to AC_IN1, and on the contrary, when AC_IN2 is more than AC_IN1, U1 output low level D2, D4 is cut
Only, D3, D5 turn on, and AC_IN1 is equal to U0, and AC_IN2 is equal to Uout0, and on the basis of reference ground, the whole waveform of output is all just
Voltage direction, this partial circuit serves the effect of all wave rectification.
In this utility model embodiment, filter unit includes：Electric capacity C7, electric capacity C8 and resistance R9；Electric capacity C7, electric capacity C8 and
Resistance R9 combination forms a π type filter circuit.Through all wave rectification above, C7, C8, R9 below are combined into a π type
Filter circuit, removes the clutter after rectification.
In this utility model embodiment, AD sample conversion unit includes：MCU sampler and AD converter；Friendship to be detected
Stream electricity, after sequentially passing through mutual inductance converting unit, rectification unit and filter unit, obtains an analogue signal, analogue signal is successively
Through MCU sampler and AD converter.Current rectifying and wave filtering circuit exports a more satisfactory direct current signal, and this signal is simulation letter
Number, through the specific pin of MCU, it is sampled and AD conversion be can get it is desirable that the data of the electric current obtaining.
Other device Action Specifications in accompanying drawing：C2, C5, C3, C4, C6 are filter capacitor, play filter action；R1, C1 rise
To effect of phase compensation；R3, R5, R7, R8 effect is to connect and protective effect；R2, R6 are pull-up resistor, play pull-up effect；
R10, R12 are the divider resistance of pop-up voltage U0, produce a less pop-up voltage, make output voltage more stable；RL is to hand over
Stream the connect load of voltage.
Summary technical scheme, a kind of current detection circuit that this utility model provides, there is advantages below：
First, selected device versatility is higher.Because the technical scheme that this utility model provides is not required to using low resistance
Precision resistance just can achieve the sampling to electric current although also requiring that resistance error controls in less scope, but because flows through electricity
Stream little, resistance can choose higher value, tens ohm or more just can, occurrence is determined on a case-by-case basis, so the choosing to resistance
Type requires compared with prior art, and precision is relatively low can also to sample to electric current, and corresponding cost is relatively low.
Second, measuring accuracy is higher.Because the technical scheme that this utility model provides does not adopt operational amplifier to letter
Number it is amplified, so operational amplifier just can be excluded because the temperature drift phenomenon caused by ambient temperature, circuit is to electric current
Measurement will be more accurate.
3rd, safety is higher.Due to this utility model provide technical scheme sampling and control circuit all with exchange height
Voltage is isolated by current transformer, therefore will not occur, because not having the Danger Electric shock risk isolated and lead to, more there is guarantor to personal safety
Barrier.
4th, test scope is wider.Because the technical scheme that this utility model provides does not take traditional diode institute
The full bridge rectifier built carries out rectification to signal, but switches the metal-oxide of low equiva lent impedance in real time using comparator
Field effect transistor carries out all-wave arrangement to signal, and device is lower on signal collected pressure drop impact, so that circuit is obtained more
Wide test scope.
In sum, this utility model provides a kind of current detection circuit, and described current detection circuit includes：Mutual inductance turns
Change unit, rectification unit, filter unit and AD sample conversion unit；Alternating current to be detected sequentially pass through mutual inductance converting unit,
Rectification unit, filter unit and AD sample conversion unit.Alternating current to be detected is through mutual inductance converting unit, rectification unit, filter
After ripple unit and AD sample conversion unit, can achieve the current detecting that the alternating current higher to voltage as civil power is isolated,
Gathered the difference of calculated electric current according to MCU, carry out the conversion of power consumption, and circuit is controlled accordingly, just
Can achieve the intelligent monitoring to power system.Solve in prior art, current detection circuit exist high to requirement on devices with
And the technological deficiency of certainty of measurement difference.Meanwhile, this utility model provide a kind of current detection circuit, also have safe,
The advantage of with low cost and applied range.
Above a kind of current detection circuit provided by the utility model is described in detail, for the one of this area
As technical staff, according to this utility model embodiment thought, all have change in specific embodiments and applications
Place, in sum, this specification content should not be construed as to restriction of the present utility model.
Claims (6)
1. a kind of current detection circuit is it is characterised in that described current detection circuit includes：Mutual inductance converting unit, rectification unit,
Filter unit and AD sample conversion unit；
Alternating current to be detected sequentially passes through described mutual inductance converting unit, rectification unit, filter unit and AD sample conversion unit.
2. current detection circuit according to claim 1 is it is characterised in that described mutual inductance converting unit includes：Electric current is mutual
Sensor and sampling resistor R4；
Alternating current to be detected first passes around described current transformer, then again through described sampling resistor R4.
3. current detection circuit according to claim 1 is it is characterised in that described rectification unit includes：Comparator U1, anti-
To device D1, metal-oxide-semiconductor field effect t D2, metal-oxide-semiconductor field effect t D4, metal-oxide-semiconductor field effect t D3 and metal oxygen
Compound field effect transistor D5；
, after comparator U1, metal-oxide-semiconductor field effect t D2 and metal-oxide-semiconductor field effect t D4 are formed electric current to be detected
Path one, metal-oxide-semiconductor field effect t D3 and metal-oxide-semiconductor field effect t D5 form path two, described path one and path
Two be all connected with described reverser D1.
4. current detection circuit according to claim 3 is it is characterised in that described rectification unit also includes：Resistance R10 and
Resistance R12；
Alternating current to be detected, after flowing through described path one or path two, flows through described resistance R10 and resistance R12.
5. current detection circuit according to claim 1 is it is characterised in that described filter unit includes：Electric capacity C7, electric capacity
C8 and resistance R9；
Described electric capacity C7, electric capacity C8 and resistance R9 combination form a π type filter circuit.
6. current detection circuit according to claim 1 is it is characterised in that described AD sample conversion unit includes：MCU and
AD conversion unit, described AD conversion unit is arranged in MCU；
Alternating current to be detected, after sequentially passing through described mutual inductance converting unit, rectification unit and filter unit, obtains a mould
Intend signal, AD conversion unit in MCU for the described analogue signal is sampled and changed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620396648.XU CN205958641U (en) | 2016-05-03 | 2016-05-03 | Current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620396648.XU CN205958641U (en) | 2016-05-03 | 2016-05-03 | Current detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205958641U true CN205958641U (en) | 2017-02-15 |
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ID=57966969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620396648.XU Active CN205958641U (en) | 2016-05-03 | 2016-05-03 | Current detection circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN205958641U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771533A (en) * | 2017-03-15 | 2017-05-31 | 南京航空航天大学 | A kind of alternating current current detection circuit that can reflect direct current biasing state based on Magnetic isolation |
| WO2019056299A1 (en) * | 2017-09-22 | 2019-03-28 | 深圳传音通讯有限公司 | Circuit for measuring zero-voltage-drop current |
-
2016
- 2016-05-03 CN CN201620396648.XU patent/CN205958641U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106771533A (en) * | 2017-03-15 | 2017-05-31 | 南京航空航天大学 | A kind of alternating current current detection circuit that can reflect direct current biasing state based on Magnetic isolation |
| CN106771533B (en) * | 2017-03-15 | 2019-05-10 | 南京航空航天大学 | An AC current detection circuit based on magnetic isolation that can reflect the DC bias state |
| WO2019056299A1 (en) * | 2017-09-22 | 2019-03-28 | 深圳传音通讯有限公司 | Circuit for measuring zero-voltage-drop current |
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| C14 | Grant of patent or utility model | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 510000 Guangdong city of Guangzhou province Panyu District Xiaoguwei street in two cross road 22 A901-A902 room Patentee after: GUANGZHOU VIDEO-STAR INTELLIGENT CO.,LTD. Address before: 510000 Guangdong city of Guangzhou province Panyu District Xiaoguwei street in two cross road 22 A901-A902 room Patentee before: GUANGZHOU VIDEO-STAR ELECTRONICS INDUSTRIAL CO.,LTD. |
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| GR01 | Patent grant |