CN207081824U - High-accuracy direct current standard electric energy meter - Google Patents
High-accuracy direct current standard electric energy meter Download PDFInfo
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- CN207081824U CN207081824U CN201720993143.6U CN201720993143U CN207081824U CN 207081824 U CN207081824 U CN 207081824U CN 201720993143 U CN201720993143 U CN 201720993143U CN 207081824 U CN207081824 U CN 207081824U
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Abstract
The utility model discloses a kind of High-accuracy direct current standard electric energy meter, including DC voltage input circuit, DC current input circuit, small-signal input circuit, signal isolation circuit, microprocessing unit, electrical energy pulse generating unit, communication unit and display unit and the power subsystem for being supplied to High-accuracy direct current standard electric energy meter operating voltage.The voltage input-terminal is connected through resistor voltage divider circuit with the input of program control discharge circuit, the output end of program control discharge circuit is connected with the signal input part of AD change-over circuits, the signal output part of AD change-over circuits is connected with the input of described signal isolation circuit, and the signal isolation circuit that the control terminal warp of program control discharge circuit is described is connected with described microprocessing unit.The utility model uses signal isolation circuit isolation control signal, avoids interfering between signal, further improves measurement accuracy, meet direct current energy meter vertification regulation.
Description
Technical field
The utility model belongs to standard electric energy meter technical field, and in particular to a kind of High-accuracy direct current standard electric energy meter.
Background technology
Current country actively promotes development new energy, and electric automobile industry has obtained quick development.With electric automobile
The development of charging technique and the needs of charging pile direct current energy metering, the application of direct current energy meter will be more and more extensive.With
To the requirement more and more higher of direct current energy metering, the precision of the direct current standard electric energy meter that the current country uses be not it is very high,
The needs of current direct current energy meter calibrating can not be met.
For this reason, it is necessary to propose a kind of novel standard electric energy meter, measurement accuracy is improved, meets direct current energy meter calibrating rule
Journey.
Utility model content
The purpose of this utility model is to provide a kind of High-accuracy direct current standard electric energy meter, is capable of the straight of accurate measurement input
Voltage, DC current and DC small signal are flowed, measurement accuracy is high, and precision is up to 0.01%.
The purpose of this utility model is to provide a kind of High-accuracy direct current standard electric energy meter, its by using signal isolation and
Isolated from power technology, interfering between each circuit is avoided, another road guarantee is provided for the stabilization of signal, further carries
High measurement accuracy.
To achieve the above objectives, the utility model is achieved through the following technical solutions：
High-accuracy direct current standard electric energy meter of the present utility model, including DC voltage input circuit, DC current input electricity
Road, small-signal input circuit, signal isolation circuit, microprocessing unit, electrical energy pulse generating unit, communication unit and display unit
And it is supplied to the power subsystem of High-accuracy direct current standard electric energy meter operating voltage.
Preferably, described DC voltage input circuit includes precision resistance bleeder circuit, program control discharge circuit and A/D
Change-over circuit, voltage input-terminal are connected through resistor voltage divider circuit with the input of program control discharge circuit, program control discharge circuit
Output end is connected with the signal input part of A/D change-over circuits, the signal output part of A/D change-over circuits and described signal isolation electricity
The input on road is connected, the described signal isolation circuit of control terminal warp of program control discharge circuit and described microprocessing unit phase
Even.With signal isolation circuit isolation control signal, interfering between signal is avoided, further improves direct current standard electric energy meter
Measurement accuracy.
Preferably, described DC current input circuit includes high precision electric current transducer, program control discharge circuit and A/D
The input of change-over circuit, current input terminal and high precision electric current transducer is connected, the output end of high precision electric current transducer
It is connected through program control discharge circuit with the input of A/D change-over circuits, the output end of A/D change-over circuits and described signal isolation electricity
The input on road is connected, the described signal isolation circuit of control terminal warp of program control discharge circuit and described microprocessing unit phase
Even.Current sampling is carried out by high precision electric current transducer, to improve the linearity of current sample and stability, while controls letter
Number again isolated with signal isolation circuit, further improve direct current standard electric energy meter measurement accuracy.
Preferably, described small-signal input circuit includes program control discharge circuit and A/D change-over circuits, small-signal input
Terminal is connected with the input of program control discharge circuit, the output end of program control discharge circuit and the signal input part of A/D change-over circuits
It is connected, the signal output part of A/D change-over circuits is connected with the input of described signal isolation circuit, the control of program control discharge circuit
The described signal isolation circuit of end warp processed is connected with described microprocessing unit.With signal isolation circuit isolation control signal, keep away
Exempt from interfering between signal, further improve the measurement accuracy of direct current standard electric energy meter.
Preferably, described A/D change-over circuits include A/D conversion chips and voltage reference chip.A/D conversion chips are adopted
A/D conversion chips are sampled with 32 fully differentials.Voltage reference chip possesses extremely low noise and outstanding long-time stability.
Preferably, described program control discharge circuit is using high accuracy, the controllable gain amplifier of zero shift.
Preferably, described communication unit includes RS232, RS485.Described communication unit and described microprocessor list
There is high speed photo coupling to be isolated between member.
Preferably, described electrical energy pulse generating unit includes high speed photo coupling and PLD.
Preferably, described display unit includes man-machine interface industrial control board and LCDs.
Brief description of the drawings
Fig. 1 is the theory diagram of the utility model preferred embodiment.
Reference includes：1- DC voltage input circuits；11- DC voltage input ends；12- precision resistances partial pressure electricity
Road；The program control discharge circuits of 13-；14-A/D change-over circuits；2- DC current input circuits；21- DC current input terminals；22-
High precision electric current transducer；The program control discharge circuits of 23-；24-A/D change-over circuits；3- small-signal input circuits；The small letter of 31- direct currents
Number input terminal；The program control discharge circuits of 33-；34-A/D change-over circuits；4- signal isolation circuits；5- microprocessing units；6- electric energy
Impulse generating unit；7- communication units；8- display units；9- man-machine interface project plates.
Embodiment
The utility model discloses a kind of High-accuracy direct current standard electric energy meter, with reference to preferred embodiment, to this practicality
New embodiment is further described.
Referring to Fig. 1 of accompanying drawing, Fig. 1 shows the operation principle of the High-accuracy direct current standard electric energy meter.Preferably, it is described
High-accuracy direct current standard electric energy meter include DC voltage input circuit 1, DC current input circuit 2, small-signal input circuit 3,
Signal isolation circuit 4, microprocessing unit 5, electrical energy pulse generating unit 6, communication unit 7, display unit 8 and man-machine interface industry control
Plate 9 and the power subsystem for being supplied to High-accuracy direct current standard electric energy meter operating voltage.
DC voltage input circuit 1 includes precision resistance bleeder circuit 12, program control discharge circuit 13 and A/D change-over circuits
14.DC voltage input end 11 is connected through precision resistance bleeder circuit 12 with the input of program control discharge circuit 13, program control fortune
The output end on electric discharge road 13 is connected with the input end of analog signal of A/D change-over circuits 14, the data signal control of A/D change-over circuits 14
End processed is connected through signal isolation circuit 4 with microprocessing unit 5, and the control terminal of program control discharge circuit 13 is through the He of signal isolation circuit 4
Microprocessing unit 5 is connected.
DC current input circuit 2 includes High-accuracy direct current sensor 22, program control discharge circuit 23 and A/D change-over circuits
24.DC current input terminal 21 is connected through High-accuracy direct current sensor 22 with the input of program control discharge circuit 23, program control fortune
The output end on electric discharge road 23 is connected with the input end of analog signal of A/D change-over circuits 24, the data signal control of A/D change-over circuits 24
End processed is connected through signal isolation circuit 4 with microprocessing unit 5, and the control terminal of program control discharge circuit 23 is through the He of signal isolation circuit 4
Microprocessing unit 5 is connected.
Small-signal input circuit 3 includes program control discharge circuit 33 and A/D change-over circuits 34.Small-signal input terminal 31 and journey
The input of control discharge circuit 33 is connected, the output end of program control discharge circuit 33 and the analog signal input of A/D change-over circuits 34
End is connected, and the Digital Signals end of A/D change-over circuits 34 is connected through signal isolation circuit 4 with microprocessing unit 5, program control amplifier
The control terminal of circuit 33 is connected through signal isolation circuit 4 with microprocessing unit 5.
As shown in Fig. 1, the input of electrical energy pulse generating unit 6 is connected with microprocessing unit 5, the He of microprocessing unit 5
Man-machine interface industrial control board 9 is connected by communication unit 7, and man-machine interface industrial control board 9 is connected with display unit 8, man-machine interface industry control
Plate 9 reads the electric quantity data of the sampling calculating of microprocessing unit 5 by communication unit 7 and shown on display unit 8.
In the present embodiment, program control discharge circuit is using the accurate, programmable operational amplifier of zero shift, A/D change-over circuits
Using 32 A/D conversion chips, the conversion accuracy of A/D conversion chips is very high, 32 A/D conversion chips using superfinishing pseudotype,
Voltage reference of the overstable temperature controlled fiducial chip as conversion, microprocessing unit use 32 ARM microprocessors, numeral
Analog signal and digital signal isolation are avoided interfering with each other between each circuit by isolation circuit.This hardware configuration is straight
The high-precision measuring of flow standard electric energy meter provides hardware foundation.
In the present embodiment, microprocessing unit reads the voltage digital signal and current digital signal of A/D conversion chips conversion,
And carry out obtaining instantaneous power after being multiplied in real time, electric energy is obtained after then instantaneous power is integrated to the time, then by electric energy
Electrical energy pulse is produced by electrical energy pulse generating unit, output high-frequency electrical energy pulse or low-frequency electrical energy arteries and veins may be selected in electrical energy pulse
Punching.Microprocessing unit is handled voltage digital signal by digital filtering method to obtain voltage measuring value, by current digital
Current measurement value is obtained after signal transacting, multiplication is obtained to obtain power measurement values after performance number is handled, these are calculated
The electricity come can be read by communication unit for host computer.
In the present embodiment, communication unit includes RS232, the RS485 to be communicated with host computer and led to man-machine interface industrial computer
The RS232 of letter, high speed photo coupling is provided between communication unit and microprocessing unit and is isolated.Electrical energy pulse generating unit includes
PLD and high speed photo coupling, the electric energy that microprocessing unit calculates can be produced electric energy arteries and veins by PLD
Punching externally output.Power subsystem includes transformer and voltage stabilizing chip, and 220V electric mains can be converted into the low of needs by transformer
Alternating current is pressed, send each unit circuit to use after bridge heap rectifying and voltage-stabilizing.
High-accuracy direct current standard electric energy meter of the present utility model, using high-definition liquid crystal display and carry touch function, boundary
Face is attractive in appearance, simple to operate；Current sensor is High-accuracy direct current sensor, and the linearity and stability are good；Changed using 32 A/D
Chip is sampled, and sampling precision is high；Power supply carries out modulus isolation, and noise jamming is small, signal stabilization.The utility model high accuracy
The accuracy class of direct current standard electric energy meter can reach 0.01%.
For a person skilled in the art, the technical scheme described in foregoing embodiments can still be repaiied
Change, or equivalent substitution is carried out to which part technical characteristic, all within the spirit and principles of the utility model, that is made is any
Modification, equivalent substitution, improvement etc., should be included in the scope of protection of the utility model.
Claims (7)
1. a kind of High-accuracy direct current standard electric energy meter, it is characterised in that including DC voltage input circuit, DC current input electricity
Road, small-signal input circuit, signal isolation circuit, microprocessing unit, electrical energy pulse generating unit, communication unit and display unit
And the power subsystem of High-accuracy direct current standard electric energy meter operating voltage is supplied to, wherein：
Described DC current input circuit includes high precision electric current transducer, program control discharge circuit and A/D change-over circuits, electric current
Input terminal is connected with the input of high precision electric current transducer, and the output end of high precision electric current transducer is through program control discharge circuit
It is connected with the input of A/D change-over circuits, the input phase of the output end of A/D change-over circuits and described signal isolation circuit
Even, the described signal isolation circuit of the control terminal warp of program control discharge circuit is connected with described microprocessing unit.
2. High-accuracy direct current standard electric energy meter according to claim 1, it is characterised in that described small-signal input circuit
Including program control discharge circuit and A/D change-over circuits, small-signal input terminal is connected with the input of program control discharge circuit, program control fortune
The output end on electric discharge road is connected with the signal input part of A/D change-over circuits, the signal output part of A/D change-over circuits and described letter
The input of number isolation circuit is connected, the described signal isolation circuit of control terminal warp of program control discharge circuit and described microprocessor
Unit is connected.
3. High-accuracy direct current standard electric energy meter according to claim 2, it is characterised in that described A/D change-over circuit bags
A/D conversion chips and voltage reference chip are included, A/D conversion chips sample A/D conversion chips using 32 fully differentials.
4. High-accuracy direct current standard electric energy meter according to claim 2, it is characterised in that described program control discharge circuit is adopted
Use controllable gain amplifier.
5. High-accuracy direct current standard electric energy meter according to claim 1, it is characterised in that described communication unit includes
RS232, RS485, there is high speed photo coupling to be isolated between described communication unit and described microprocessing unit.
6. High-accuracy direct current standard electric energy meter according to claim 1, it is characterised in that described electrical energy pulse occurs single
Member includes high speed photo coupling and PLD.
7. High-accuracy direct current standard electric energy meter according to claim 1, it is characterised in that described display unit includes people
Machine interface industrial control board and LCDs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720993143.6U CN207081824U (en) | 2017-08-09 | 2017-08-09 | High-accuracy direct current standard electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720993143.6U CN207081824U (en) | 2017-08-09 | 2017-08-09 | High-accuracy direct current standard electric energy meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207081824U true CN207081824U (en) | 2018-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720993143.6U Active CN207081824U (en) | 2017-08-09 | 2017-08-09 | High-accuracy direct current standard electric energy meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107315156A (en) * | 2017-08-09 | 2017-11-03 | 浙江涵普电力科技有限公司 | High-accuracy direct current standard electric energy meter |
-
2017
- 2017-08-09 CN CN201720993143.6U patent/CN207081824U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107315156A (en) * | 2017-08-09 | 2017-11-03 | 浙江涵普电力科技有限公司 | High-accuracy direct current standard electric energy meter |
| CN107315156B (en) * | 2017-08-09 | 2024-04-16 | 浙江涵普电力科技有限公司 | High-precision direct-current standard electric energy meter |
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