CN208721730U - A kind of electric current and voltage acquisition equipment - Google Patents
A kind of electric current and voltage acquisition equipment Download PDFInfo
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- CN208721730U CN208721730U CN201820869848.1U CN201820869848U CN208721730U CN 208721730 U CN208721730 U CN 208721730U CN 201820869848 U CN201820869848 U CN 201820869848U CN 208721730 U CN208721730 U CN 208721730U
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Abstract
The utility model relates to a kind of electric currents and voltage acquisition equipment, the acquisition equipment includes current sampling circuit, voltage sampling circuit and sampled reference source circuit, the voltage sampling circuit and the current sampling circuit are separately connected the sampled reference source, have voltage sampling circuit, two-way current sampling circuit and a load sampled reference source all the way in the acquisition equipment.The utility model can provide accurately electric current and voltage acquisition signal for control equipment, to realize the switch control of illuminator, the alarm for failure of turning off the light, large-power lamp light modulation, it ensure that the high reliability of equipment by simple circuit design, simplify the technological process of production, reduce device element cost and production cost again.
Description
Technical field
The utility model relates to wisdom illuminations, smart city field, especially a kind of electric current and voltage acquisition equipment.
Background technique
In road lighting field, most road lamp carries out circuit switching control using A.C. contactor, by fixed
When time control equipment control contactor to street lamp loop power realize road lamp power switch, the method for controlling street lamps i.e. cannot
The independent switch control for realizing street lamp can not realize the brightness adjustment control of street lamp, while it is former to occur turning off the light to the street lamp in circuit
Barrier can not be found in time, so that road lamp maintenance needs to put into a large amount of manpower and material resources.
In the field of home lighting with industrial park, illumination of plant building field, most of lamps and lanterns are using wall switch, switch knob
Lamp carry out manual switch, often occur in use personnel leave rear lighting lamp tool be still in lighting lamp state, that is, waste
Electric energy, and reduce illuminator service life.
There is the manufacturer of part on Vehicles Collected from Market to realize the automation switch control of street lamp, though the single-lamp controller of design
It so can be realized the switch control of the illuminator of automation and the fault detection of lamps and lanterns, but these products nearly all use electricity
Can metering chip detect illuminator power consumption, judged according to lamps and lanterns power consumption lamps and lanterns whether failure；These electric energy meters
It is complicated to measure the usual peripheral circuit of chip, it is expensive, cause controller failure point more, is easily damaged；Simultaneously for electrical energy measurement
The parameters such as electric current, voltage, power, electric energy, when production, each equipment required to carry out individually measuring correction, and rectified an instrument
Expensive, production technology is smooth complicated, causes production cost high；Some electric energy computation chip peripheral circuits are using isolation
Current transformer and voltage transformer carry out electrical energy parameter sampling, but the usual volume of this single-lamp controller is larger, and electricity is isolated
Current transformer and voltage transformer are indispensable；Some electric energy computation chip peripheral circuits carry out electricity using non-isolated bleeder circuit
Energy parameter sampling, but this single-lamp controller is not due to having using isolation circuit, it is easy to cause its own by the sense on route
Answer that thunder and lightning is broken or the high-pressure electrostatic on route, surge pulse group are broken, this kind of single-lamp controller needs additionally when in use
The expensive lightning-protection module of configuration just can guarantee its safe and reliable work.
Currently marketed illuminator usually to single-lamp controller do not need so complicated so high-precision electric current,
The sampling of the parameters such as voltage, active power, reactive power, apparent energy, power factor (PF), electric energy statistics, mostly just needs out
Control and breakdown judge of turning off the light are closed, is that also it is only necessary to a dimming functions for large-power lamp, from circuit design
Reliability perspectives set out, and single-lamp controller circuit is simpler, and failure rate is lower.
The carry micro- station of numerous electrical equipments such as camera, 4G, 5G, traffic radar etc. on current street lamp post, these set
The standby power supply power supply for all borrowing street lamp, when in order to guarantee power supply on equipment daytime, street lamp bulb is in close state, it usually needs is changed
It individually is laid with service cable to electrical equipment, construction work amount is huge.These defects mentioned above have become urgent need solution
Certainly the technical issues of.
Utility model content
In order to solve the above problem in the prior art, the utility model devises a kind of electric current and voltage acquisition equipment,
Accurately electric current and voltage acquisition signal can be provided for control equipment, to realize the switch control of illuminator, failure of turning off the light
Alarm, large-power lamp light modulation, by simple circuit design be ensure that equipment high reliability, simplify production technology
Process reduces device element cost and production cost again.
The utility model adopts the technical scheme that
A kind of electric current and voltage acquisition equipment, the acquisition equipment include current sampling circuit, voltage sampling circuit and
Sampled reference source circuit, it is characterised in that:
The voltage sampling circuit and the current sampling circuit are separately connected the sampled reference source, the acquisition equipment
In there is voltage sampling circuit, two-way current sampling circuit and a load sampled reference source all the way.
Further, the current sampling circuit is turned using the current transformer of turn ratio 1000:1 by high current is loaded
It is changed to low current, current signal is then converted into voltage signal.
Further, the voltage sampling circuit use 1:1 voltage transformer, then connect a 200K resistance into
Row voltage sample.
Further, the sampled reference source circuit uses TL431 chip to generate the voltage of a 2.495V, then leads to
Cross the reference voltage Vref that electric resistance partial pressure obtains a 1V.
Further, there is protection TVS pipe in the sample circuit.
Further, the current sampling circuit does first order absorption in one TVS pipe of secondary parallel, prevents mutual inductor
Grade generates the harm that peak voltage causes over-voltage to rear end, and mutual inductor uses current transformer 5A:5mA.
Further, the voltage sampling circuit exists in the input terminal that a primary and MOV for mutual inductor is effectively protected
Lightning stroke by when the bleed-off circuit of energy is provided, while in one TVS pipe of secondary parallel, doing duplicate protection, absorb primary
Secondary dump energy spike is passed to, the harm for causing over-voltage to rear end is avoided, mutual inductor uses voltage transformer 2mA:2mA.
The beneficial effects of the utility model are: accurately electric current and voltage acquisition signal can be provided for control equipment, with
It realizes the switch control of illuminator, the alarm for failure of turning off the light, large-power lamp light modulation, is guaranteed by simple circuit design
The high reliability of equipment simplifies the technological process of production, reduces device element cost and production cost again.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as practical to this
Novel limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is the structural schematic diagram for acquiring equipment；
Fig. 2 is the circuit diagram of voltage and current sample equipment；
The following is a further explanation of the present invention with reference to the accompanying drawings and embodiments.
Specific embodiment
The utility model is described in further detail With reference to embodiment:
Fig. 1 is the structural schematic diagram for acquiring equipment.
Acquire includes current sampling circuit, voltage sampling circuit and sampled reference source circuit, voltage sample electricity in equipment
Road and current sampling circuit are separately connected sampled reference source.
Wherein, current sampling circuit carries out being converted to small electricity using the current transformer of turn ratio 1000:1 by high current is loaded
Stream, is then converted to voltage signal for current signal, because alternating current be the voltage signal converted out of sine wave signal have just have it is negative,
It is biased addition adjustment by first order operational amplification circuit, negative voltage is adjusted to positive voltage, is then transported by the second level
It calculates amplifying circuit progress 1:1 and follows amplification, for doing impedance adjustment, then input to the 1.7V-3V sine voltage of output
The A D interface of processor carries out high-speed ADC sampling.
The voltage sampling circuit of the utility model, using the voltage transformer of 1:1, the resistance of the 200K that then connects into
Row voltage sample, it is identical with load current sampling principle, addition adjustment is biased by first order operational amplification circuit, will be born
Voltage is adjusted to positive voltage, then carries out 1:1 by second level operational amplification circuit and follows amplification, for doing impedance adjustment, so
The A D interface that output 1.7V-3V sine voltage signal inputs to processor afterwards carries out high-speed ADC sampling.
The utility model avoids in operational amplifier amplification process to improve the ADC sampling precision to electric current and voltage
The error of production includes sampled reference source circuit in sample devices, which is generated by a TL431 chip
Then the voltage of one 2.495V obtains the reference voltage Vref of a 1V by electric resistance partial pressure to guarantee the steady of operational amplifier
Fixed work, ensure that the sampling precision of electric current and voltage.And it is adopted by carrying out ADC to sampled reference source Vref by processor
Sample can verify the error in sampled reference source, carry out error correction by software, ensure that the utility model carries out electric current and voltage
It can achieve 1% sampling precision.
The current sampling circuit and voltage sampling circuit of the utility model all use mutual inductor and carry out load current voltage
Sampling, because of mutual inductor insulation performance with higher, and in sample circuit have protection TVS pipe, ensure that have lightning stroke and
When surge current occurs, the load current and voltage sampling circuit and processor of equipment will not be damaged.The utility model only needs
Anti-lightning strike and Anti-surging protective treatment is carried out to AC/DC power supply module.
The utility model has one in voltage and current sample equipment to adapt to the applications of a variety of different road lamps
Road voltage sampling circuit, two-way current sampling circuit and a load sampled reference source.
Fig. 2 is the circuit diagram of voltage and current sample equipment.It include current sample in voltage and current sample equipment
Circuit, voltage sampling circuit and sampled reference source circuit.It is specific as follows:
Current sampling circuit does first order absorption in one TVS pipe of secondary parallel, prevents transformer secondary from generating spike electricity
Pressure causes the harm of over-voltage to rear end, and mutual inductor uses current transformer 5A:5mA, that is, turn ratio 1000:1, i.e., if primary
Side electric current is that i1 is 1A, then secondary side i2=1/1000=1mA, and R602 both end voltage is ui2=i2*R602=1V(virtual value), width
Value is 1.414V, ui2max=1.414V, ui2min=- 1.414V, since the electric current of sampling is AC signal so there is positive negative electricity
Pressure, amplifier are for the first time bias amplifier, by negative voltage total transform at positive voltage,
Input/output relation formula is as follows:
Uo1=ui1-R603/R601(ui2-ui1)
Wherein, positive input voltage is ui1, that is, Vref, reverse input end voltage ui2, i.e. R602 both end voltage.
ui2=R602*i1/1000
As the * R602*i1/1000 of ui2=ui2min=- 1.414, CURRENT_ADC_1 samples to obtain crest voltage
Uo1p can calculate primary side current virtual value by above-mentioned formula.
C12 makees active power filtering, filters out High-frequency Interference, and second level amplifier follows circuit to do impedance transformation, improves sampling essence
Degree.Primary input current is 1A, and calculating theoretical sample magnitude voltage is 1.789V.
Voltage sampling circuit, in the input terminal that a primary and MOV for mutual inductor is effectively protected when lightning stroke passes through
It waits and the bleed-off circuit of energy is provided, while in one TVS pipe of secondary parallel, doing duplicate protection, absorb primary and pass to the surplus of secondary
Complementary energy spike, avoids the harm that over-voltage is caused to rear end, and mutual inductor uses voltage transformer 2mA:2mA, that is, the turn ratio
2000:2000 surveys one 200K resistance of series connection primary, i.e., if primary side voltage is 220V, primary side current i1=220/
200000=1.1mA, secondary side are also i2=1.1mA, and R703 both end voltage is ui2=i2*1000=1.1V(virtual value), maximum value
For 1.555V, minimum value is -1.555V, and since the electric current of sampling is AC signal so there is generating positive and negative voltage, amplifier is for the first time
Bias amplifier, by negative voltage total transform at positive voltage.
Input/output relation formula is as follows:
Uo1=ui1-R704/R702(ui2-ui1)
Wherein, positive input voltage is ui1, that is, Vref, reverse input end voltage ui2, i.e. R703 both end voltage.
ui2=R703*i1/1000
As the * R703*Vin/R701 of ui2=ui2min=- 1.414, VOLTAGE_ADC_3 samples to obtain crest voltage
Uo1p,
An input voltage vin can be calculated by relational expression ui2=R703*Vin/R701.
C12 makees active power filtering, filters out High-frequency Interference, and second level amplifier follows circuit to do impedance transformation, improves sampling essence
Degree.When input voltage is 220V, calculating theoretical sample magnitude voltage is 2.275V.
High-precision TL431 is shorted by sampled reference source circuit with reference to pole and cathode, and it is effective to do high-precision voltage stabilizing, reference level
Stablize output 2.495V, fluctuation actual measurement 10-15mV, by R502, it is 1V reference voltage that R503 partial pressure, which takes R503 both end voltage,
Vref can do AD voltage sample at the both ends R503 to improve higher precision, the correction reference source in software, improve electric current
Sampling precision.
The above is only the preferred embodiment of the utility model, it is noted that for the common skill of the art
For art personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these improve and
Retouching also should be regarded as the protection scope of the utility model.
The preferable specific embodiment of the above, only the utility model, but the protection scope of the utility model is not
It is confined to this, anyone skilled in the art within the technical scope disclosed by the utility model, can readily occur in
Change or replacement, should be covered within the scope of the utility model.Therefore, the protection scope of the utility model should be with
Subject to the scope of protection of the claims.
In the above-described embodiments, can come wholly or partly by software, hardware, firmware or any combination thereof real
It is existing.When implemented in software, it can entirely or partly realize in the form of a computer program product.The computer program
Product includes one or more computer instructions.When loading on computers and executing the computer program instructions, all or
It partly generates according to process or function described in the utility model embodiment.The computer can be general purpose computer, specially
With computer, computer network or other programmable devices.The computer instruction can store in computer-readable storage
In medium, or from a computer readable storage medium to the transmission of another computer readable storage medium, for example, the meter
Calculation machine instruction can from a web-site, computer, server or data center by wired or wireless way to another
Web-site, computer, server or data center are transmitted.The computer readable storage medium can be computer capacity
Any usable medium enough accessed either includes that the data such as one or more usable mediums integrated server, data center are deposited
Store up equipment.The usable medium can be magnetic medium, optical medium or semiconductor medium etc..
Claims (7)
1. a kind of electric current and voltage acquisition equipment, the acquisition equipment includes current sampling circuit, voltage sampling circuit and adopts
Sample reference source circuit, it is characterised in that:
The voltage sampling circuit and the current sampling circuit are separately connected the sampled reference source, have in the acquisition equipment
There are voltage sampling circuit, two-way current sampling circuit and a load sampled reference source all the way.
2. electric current according to claim 1 and voltage acquisition equipment, it is characterised in that:
The current sampling circuit carries out being converted to low current using the current transformer of turn ratio 1000:1 by high current is loaded, so
Current signal is converted into voltage signal afterwards.
3. electric current according to claim 1 and voltage acquisition equipment, it is characterised in that:
The voltage sampling circuit uses the voltage transformer of 1:1, and the resistance for the 200K that then connects carries out voltage sample.
4. electric current according to claim 1 and voltage acquisition equipment, it is characterised in that:
The sampled reference source circuit uses TL431 chip to generate the voltage of a 2.495V, is then obtained by electric resistance partial pressure
Obtain the reference voltage Vref of a 1V.
5. electric current according to claim 1 and voltage acquisition equipment, it is characterised in that:
There is protection TVS pipe in the sample circuit.
6. electric current according to claim 1 and voltage acquisition equipment, it is characterised in that:
The current sampling circuit does first order absorption in one TVS pipe of secondary parallel, prevents transformer secondary from generating peak voltage
The harm of over-voltage is caused to rear end, mutual inductor uses current transformer 5A:5mA.
7. electric current according to claim 1 and voltage acquisition equipment, it is characterised in that:
The input terminal that the voltage sampling circuit is effectively protected in a primary and MOV for mutual inductor is when lightning stroke passes through
The bleed-off circuit of energy is provided, while in one TVS pipe of secondary parallel, doing duplicate protection, primary is absorbed and passes to secondary residue
Energy spikes, avoid the harm that over-voltage is caused to rear end, and mutual inductor uses voltage transformer 2mA:2mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820869848.1U CN208721730U (en) | 2018-06-06 | 2018-06-06 | A kind of electric current and voltage acquisition equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820869848.1U CN208721730U (en) | 2018-06-06 | 2018-06-06 | A kind of electric current and voltage acquisition equipment |
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| Publication Number | Publication Date |
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| CN208721730U true CN208721730U (en) | 2019-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820869848.1U Active CN208721730U (en) | 2018-06-06 | 2018-06-06 | A kind of electric current and voltage acquisition equipment |
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| CN (1) | CN208721730U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113767A (en) * | 2021-11-12 | 2022-03-01 | 天津航空机电有限公司 | Circuit for improving small current acquisition precision of solid-state power controller |
-
2018
- 2018-06-06 CN CN201820869848.1U patent/CN208721730U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113767A (en) * | 2021-11-12 | 2022-03-01 | 天津航空机电有限公司 | Circuit for improving small current acquisition precision of solid-state power controller |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191223 Address after: 361013 Room 501, No.42, Guanren Road, Siming District, Xiamen City, Fujian Province Patentee after: Ye Yirong Address before: 430074 Hubei Wuhan East Lake high tech Zone, Optics Valley Road, 3 Island 2 units Patentee before: Ma Shan Yang Communication Technology Co. Ltd. |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200720 Address after: Room 501, No.42, Guanren Road, Siming District, Xiamen City, Fujian Province Patentee after: Xiamen Jingfu Communication Co., Ltd Address before: 361013 Room 501, No.42, Guanren Road, Siming District, Xiamen City, Fujian Province Patentee before: Ye Yirong |
|
| TR01 | Transfer of patent right |