CN107315143A - The high-precision current signal source circuit of multrirange multistation - Google Patents
The high-precision current signal source circuit of multrirange multistation Download PDFInfo
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
Abstract
The invention discloses a kind of high-precision current signal source circuit of multrirange multistation.The single-station current signal that the present invention is sent using current transformer isolated array, measurement range selection and current ratio amplifier modulate circuit to high-precision three-phase standard source is handled.First, the current signal source of single-station is divided into the current signal source of five stations using current transformer isolated array（Configurable station quantity number depend on single-phase the sent peak power of three-phase standard source, present invention design is by taking five stations in practical application as an example）；Secondly, by the switching of relay, size measurement range selection can be carried out to the current signal of five stations；Finally, the modulation of current ratio amplifier modulate circuit is passed through, it is ensured that uniformity, high linearity and the high-precision feature of five station current signals.The operating efficiency of detection means is improved five times by the present invention, and the efficiency of test product quality testing has been effectively ensured, and reduces production cost, the use value with reality.
Description
Technical field
The present invention relates to a kind of circuit of detection technique field, applied to the detection of intelligent switch electrical part, specifically
Ground is said, is to provide a kind of high-precision current signal source circuit of multrirange multistation for intelligent switch electrical equipment, to detect intelligence
Can the defencive function of device for switching in actual applications normal work.
Background technology
For the quality testing of intelligent switch electric equipment products, the serial electrical apparatus release of such as CW Series Circuit Breakers, CM is, it is necessary to it
Connect, disjunction power system function and the protection to various failures such as equipment appearance overload, under-voltage, short-circuit and earth faults are controlled
Function carries out factory testing.Detection means needs to provide in various analog voltages, current signal input intelligent switch electric equipment products,
To examine its function whether normal.But traditional check system can only be in single single-station mode, for large batch of intelligence
Device for switching Product checking haves the shortcomings that efficiency is low, accuracy of detection is low and false drop rate is high.
The content of the invention
Goal of the invention.
The present invention is carried out efficiently to intelligent switch electric equipment products multistation simultaneously in order to solve not realizing in the prior art
The problem of rate is detected, so that propose and devise a kind of high-precision current signal source circuit of multrirange multistation, and in reality
Detection efficiency and precision are improved in.
The technical solution adopted in the present invention.
A kind of high-precision current signal source circuit for multrirange multistation that the present invention is proposed and designed, including Current Mutual Inductance
Device isolated array circuit, selective circuit of measuring range and current ratio amplifier modulate circuit；External three-phase standard source sends electric current input
Described current transformer isolated array circuit, the phase current signal of current transformer isolated array circuit output A, B, C, N tetra-, often
One is mutually divided into five road current signals connects selective circuit of measuring range respectively, and selective circuit of measuring range reconnects current ratio amplifier conditioning electricity
Road, final output.
Further in embodiment, the described current transformer isolated array output phase current of A, B, C, N tetra- is mutual
Sensor isolated array current signal, the current signal of each phase is divided into five stations, and each station uses current transformer, five stations
Current transformer input is connected, and output end connects a selective circuit of measuring range respectively, and each selective circuit of measuring range is respectively with one
Individual current ratio amplifier modulate circuit is connected.
Further in embodiment, the input of the A phase, B phase, C phase of current transformer isolated array passes through three
Individual relay J1, J3, J4 are connected with three-phase standard source A phase, B phase, C phase input respectively（Circuit is as shown in Figure 1）, each relay
The effect of device is to ensure the electric current of A phase, B phase, C phase send can be by upper computer software programme-control, as needed come the company of selection
On-off is opened.The input of the N phases of current transformer isolated array passes through a relay J2 and three-phase standard source A phase inputs
It is connected.Need exist for explanation：The A phase output terminals mouthful of A phase currents and N phase currents generation circuit multiplexing three-phase standard source, A phase currents
It can not be worked simultaneously with N phase currents generation circuit, i.e., J1, J2 can not be closed in detection process, normal testing process is
First lead to A, B, C three-phase current, then open J1, close J2, individually logical N phase currents；
Further in embodiment, described current ratio amplifier modulate circuit and the selective circuit of measuring range include electricity
Hinder R1, R2, R3, R4, R5, R6, R7, R8, R10, R11, adjustable resistance R9, R12, electric capacity C, relay J5, power amplifier chips U1 and
Power supply, power amplifier chips U1 is LM3886 model specifications, and the selective circuit of measuring range is divided into wide range selection circuit and small-range choosing
Select circuit；
Wherein small-range selection circuit is in parallel with R10 after R11, R12 series connection, passes through the normal of contact 1 and measurement range selection relay
Closed contact 2 is connected；Wide range selection circuit by R8, R9 it is in parallel after connected with R7, pass through the normal of contact and measurement range selection relay
Contact 3 is opened to connect；
The contact 1 of measurement range selection relay connects the input of each station, while being sequentially connected resistance R1, resistance R4, and connects
Enter chip U1 10 pin, the R4 other end is connected the R1 other ends and be connected with pin 10 with R6, output OUT terminal；
R8, R9, R10, R12 other end connect the output end of each station respectively, while resistance R2, resistance R3 are sequentially connected,
And power amplifier chips U1 3 pin are accessed, the R3 other end is connected with R6, output OUT terminal；The R1 other ends are connected with pin 9.
Further in embodiment, power amplifier chips U1 1 pin connects the+24V of external dc power, U1 2 pin
It is empty, U1 3 pin connection resistance R6, R3, U1 4 pin connect the -24V of external dc power, U1 5 pin connection external dc electricity
+ the 24V in source, U1 6 pin are empty, and U1 7 pin connection electric capacity C is simultaneously grounded, the electric capacity C other end and chip U1 8 pin, resistance R5
The connection, -24V connections of resistance the R5 other end and external dc power, U1 8 pin are connected with electric capacity C, resistance R5, U1 9 pin
It is connected with resistance R2, R3, U1 10 pin are connected with resistance R1, R4, U1 11 pin are empty.
Further in embodiment, described resistance R1, R2, R3, R4, R5, R6, R7, R8, R10, R11 is manganese
Copper wire resistance.
Further in embodiment, the output end of the high-precision current signal source circuit of multrirange multistation is direct
Connect the test product of five stations.
Technique effect produced by the present invention.
（1）The present invention passes through current transformer isolated array circuit, it is possible to achieve the multiple range detection of multistation.
（2）The present invention is set by the size range circuit of current transformer isolated array circuit and selective circuit of measuring range
Put, can both ensure the uniformity of current signal, while further having expanded the mode of multi-range measurement.
（3）The regulation current transformer isolated array electricity that the present invention passes through being adapted to property of current ratio amplifier modulate circuit
Road and the electric current of range circuit output, application are wider.
（4）The present invention connects selective circuit of measuring range respectively due to multistation, and current output signal is completely independent isolation, realizes
Multistation it is mutually isolated, with characteristics such as temperature-compensating, electromagnetism interferences.
（5）Five current transformer series connection of same phase in current transformer isolated array circuit of the present invention, can be achieved three-phase
The same phase by-passing of standard source monophase current（It is divided into five stations）, pass through the current ratio amplifier modulate circuit in follow-up five tunnel
Effect, can be achieved the tunnels of Tong Xiang five produce electric current uniformity and the linearity, it is ensured that the input test electric current of five work station products
Detection uniformity.Required according to the accuracy of detection of product（Error is no more than 5/1000ths）, it is in actual applications, real
Now and it disclosure satisfy that design requirement.
The present invention, which is used for multistation product test field, in summary can further improve reliability and the survey of checking system
Precision is tried, production efficiency is improved, production cost is reduced.
Brief description of the drawings
Fig. 1 is the current transformer isolated array circuit diagram of the present invention；
Fig. 2 is the selective circuit of measuring range and current ratio amplifier modulate circuit figure of the present invention.
Fig. 3 is the building-block of logic of the present invention.
Embodiment
1. as shown in figure 3, a kind of high-precision current signal source circuit of multrirange multistation proposed by the present invention, including electricity
Current transformer isolated array circuit, selective circuit of measuring range and current ratio amplifier modulate circuit；External three-phase standard source sends electricity
Flow the current transformer isolated array circuit described in input, the phase current of current transformer isolated array circuit output A, B, C, N tetra-
Signal, each phase is divided into five road current signals and connects selective circuit of measuring range respectively, and selective circuit of measuring range reconnects current ratio fortune
Put modulate circuit, final output.By multiple stations and multiple range setting, the detection efficiency and precision of product are improved.
2. the specific implementation of key component module：Current transformer isolated array.
Current transformer isolated array circuit of the present invention is made up of the phase current source circuit of A, B, C, N tetra-.Wherein：
（1）A phase currents source positive terminal by three-phase standard ource electric current+iA terminals are produced, and pass through relay J1 and five Current Mutual Inductances
Device A1, A2, A3, A4, A5 are serially connected, and negative pole end connection three-phase standard ource electric current-iA terminals.
（2）B phase currents source positive terminal by three-phase standard ource electric current+iB terminals are produced, and pass through relay J3 and five electric currents
Transformer B1, B2, B3, B4, B5 are serially connected, and negative pole end connection three-phase standard ource electric current-iB terminals.
（3）C phase currents source positive terminal by three-phase standard ource electric current+iC terminals are produced, and pass through relay J4 and five electric currents
Transformer C1, C2, C3, C4, C5 are serially connected, and negative pole end connection three-phase standard ource electric current-iC terminals.
（4）N phase currents source positive terminal by three-phase standard ource electric current+iA terminals are produced, and pass through relay J2 and five electric currents
Transformer N1, N2, N3, N4, N5 are serially connected, and negative pole end connection three-phase standard ource electric current-iA terminals.
As shown in figure 1, current transformer isolated array of the present invention amounts to 20 electricity by the station of tetra- phase of A, B, C, N five
Current transformer is constituted, and each input of current transformer is connected in series in each column, each output termination selective circuit of measuring range and
Current ratio amplifier modulate circuit.
The input of the A phase, B phase, C phase of current transformer isolated array is by three relays J1, J3, J4 respectively with three
Phase standard source A phase, B phase, C phase input is connected, and the effect of each relay is to ensure the electric current of A phase, B phase, C phase send can
By upper computer software programme-control, select to connect or disconnect as needed.The input of the N phases of current transformer isolated array
It is connected by a relay J2 with three-phase standard source A phase inputs.
Need exist for explanation：The A phase output terminals mouthful of A phase currents and N phase currents generation circuit multiplexing three-phase standard source, A phases
Electric current and N phase currents generation circuit can not be worked simultaneously, i.e., J1, J2 can not be closed in detection process, normal detection stream
Journey is first logical A, B, C three-phase current, then open J1, closes J2, individually logical N phase currents；
The described current transformer isolated array output phase current mutual inductor isolated array current signal of A, B, C, N tetra-, Mei Yixiang
Current signal be divided into five stations, each station uses current transformer, the series connection of five station current transformer inputs, output end
A selective circuit of measuring range is connected respectively, and each selective circuit of measuring range is connected with a current ratio amplifier modulate circuit respectively.
The output end of the high-precision current signal source circuit of multrirange multistation is directly connected to the test product of five stations.20 electric currents are mutual
Every 5 current transformers are connected during the effect of sensor, and a certain unidirectional current of three-phase standard source is divided into five tunnels with mutually electricity
Stream；The phase generation circuit of A, B, C, N tetra- is needed altogether, so needing 20 current transformer compositions to be galvanically isolated array altogether.
Need exist for explanation be：The current transformer isolated array is key component module, at present multichannel on the market
（High-precision current sources more than 5 passages）Current source device is few, and expensive, and port number is difficult extension.Present invention design profit
With the high precision current transformer of custom-made（Ratio is changed into 1A：20mA, precision is 5/10000ths）, three-phase standard source is single-phase
Electric current（Precision is 2/10000ths）Successfully it is divided into five road current channels, key technology is related to the mode of connection of circuit, temperature-compensating
Deng.For the uniformity of five tunnel output currents, because the impossible parameter of 20 current transformers is completely the same, one certainly will be caused
Five road current parameters have certain error on station, and according to the requirement of design, the input current precision of product is no more than thousand points
Five, in addition it is also necessary to subsequent conditioning circuit configure current ratio discharge circuit.3. the specific implementation of crucial modulate circuit：Current ratio amplifier
Modulate circuit and the selective circuit of measuring range.
（1）Effect
1. the effect of current ratio amplifier modulate circuit：The five road electric currents that current transformer isolates display input are carried out consistent
Property regulation so that a road electric current of station Shang five is almost consistent, and error be no more than 5/1000ths.And pass through regulation
Change the input resistance Ri of current ratio amplifier modulate circuit, output current can be amplified, the testing range scope of product is reached
Demand, the input current scope of product is between 2mA ~ 800mA.
2. selective circuit of measuring range is set to coordinate current ratio amplifier modulate circuit, and big small-range changes in fact
That become is exactly input resistance Ri, and the electric current amplifier multiple of wide range is 7.5 times, and small-range is 1.5 times, by the input current of product
Scope 2mA ~ 800mA, is divided into two segments, i.e. 2mA ~ 150mA（Small-range）Range section and 100mA ~ 800mA（Wide range）Model
Enclose section, two range sections have common factor, thus ensure input product electric current have good uniformity in respective segment, it is linear
Degree and sensitivity.
（2）As shown in Fig. 2 by taking the A phase currents of a station as an example, illustrating current ratio amplifier modulate circuit and measurement range selection
The connected mode and mode of operation of circuit.
1. core power amplifier chips U1 connected mode and mode of operation：Resistance R1 and resistance R4, power amplifier chips U1
（LM3886）The connection of 10 pin, the R4 other end and R6, export OUT terminal and be connected.The R6 other end and U1 3 pin, resistance R3 connect
Connect, the resistance R3 other end is connected with R2, U1 9 pin, the R2 other end with-iA1 connections.U1 1 pin connection external dc electricity
+ the 24V in source, U1 2 pin are empty, and U1 3 pin connection resistance R6, R3, U1 4 pin connect the -24V of external dc power, the 5 of U1
Pin connects the+24V of external dc power, and U1 6 pin are empty, and U1 7 pin connection electric capacity C is simultaneously grounded, electric capacity the C other end and U1
8 pin, resistance R5 the connections, -24V connections of resistance the R5 other end and external dc power, U1 8 pin and electric capacity C, resistance R5
Connection, U1 9 pin are connected with resistance R2, R3, and U1 10 pin are connected with resistance R1, R4, and U1 11 pin are empty.The partial circuit is
Current ratio amplifier modulate circuit, U1 is LM3886 model specifications.Resistance R1 of the present invention, R2, R3, R4, R5, R6, R7,
R8, R10, R11 are manganese-copper filament resistance.
Power amplifier chips U1 has output power（Continuous power output 68W）, the distortion factor it is small（Total distortion plus noise<
0.03%）, defencive function（Loudspeaker punching during including overvoltage protection, overtemperature protection, current limit, temperature limiting, Switching Power Supply
Hit protection, noise elimination function）Complete, peripheral cell is few, makes debugging easily, stable and reliable in work.In circuit design of the present invention,
It is the Primary Component of the amplification for electric current.After peripheral balance resistance R1=R2, R3=R4 type selectings, power amplifier chips U1 amplification electric currents
Multiple Ai=Ri/Ro, wherein, Ri is the resistance value of the large and small range of input, and Ro is output end R6 resistance value.
2. the connected mode and mode of operation of small-range selection circuit：+iA1 and resistance R1 and relay J5 1 contact phase
Even, relay J5 normally closed interlock 2 is connected with resistance R10, R11 one end, and the adjustable resistance R12 and resistance R11 other end connects
Connect, i.e. R11 is in parallel with R10 again after being connected with R12, resistance R10 and adjustable resistance the R12 other end with-iA1 connections, the part
Circuit is small-range selection circuit.
, can according to the connection in series-parallel relation of small-range circuit and the input/output relation of power amplifier chips U1 amplification electric current multiple
Using obtain small-range current ratio adjust multiple as：
3. the connected mode and mode of operation of wide range selection circuit：Relay J5 normally open contact 3 is connected with resistance R7, R7
The other end be connected simultaneously with resistance R8, adjustable resistance R9, resistance R8 and adjustable resistance the R9 other end with-iA1 connections, the portion
Parallel circuit is wide range selection circuit.
, can according to the connection in series-parallel relation of wide range circuit and the input/output relation of power amplifier chips U1 amplification electric current multiple
Using obtain wide range current ratio adjust multiple as：
By adjusting corresponding adjustable resistance R12, R9 resistance, the magnitude range of output current, Er Qieke can be not only adjusted
To ensure uniformity, the linearity and the sensitivity of five station output currents.
4. a kind of output end of the high-precision current signal source circuit of multrirange multistation of the present invention is directly connected to
The test product of five stations.
5. multistation of the present invention（Multichannel）Technology is not simple shunt current principle, key technology be related to every
From, temperature-compensating, electromagnetism interference, its advantage is high accuracy, cost is low, station（Passage）Quantity is expansible.
6. multrirange technology of the present invention is not simple series-parallel circuit principle, but from practical application,
In order to ensure the uniformity, the linearity and sensitivity of test product input current, output current segment separation is carried out.Selection can
The resistance for adjusting resistance is 10 ohm, in circuit design, by itself and resistance R8=1 ohm（Small-range）, R10=1 ohm（Wide range）
Resistance be in parallel so that adjustable extent between 0 ~ 1 ohm, be adapted to electric current fine adjustments, so as to ensure the consistent of electric current
Property.
Above-described embodiment is preferably embodiment, but embodiments of the present invention are not by above-described embodiment of the invention
Limitation, other any Spirit Essences without departing from the present invention and the change made under principle, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (7)
1. a kind of high-precision current signal source circuit of multrirange multistation, including current transformer isolated array circuit, range
Selection circuit and current ratio amplifier modulate circuit；External three-phase standard source sends the described current transformer isolation of electric current input
Array circuit, it is characterised in that：The phase current signal of current transformer isolated array circuit output A, B, C, N tetra-, each phase is divided into
Five road current signals connect selective circuit of measuring range respectively, and selective circuit of measuring range reconnects current ratio amplifier modulate circuit, finally
Output.
2. the high-precision current signal source circuit of multrirange multistation according to claim 1, it is characterised in that：Described
Current transformer isolated array exports the phase current mutual inductor isolated array current signal of A, B, C, N tetra-, the current signal of each phase
It is divided into five stations, each station uses current transformer, and five station current transformer inputs series connection, output end connects one respectively
Individual selective circuit of measuring range, each selective circuit of measuring range is connected with a current ratio amplifier modulate circuit respectively.
3. the high-precision current signal source circuit of multrirange multistation according to claim 1, it is characterised in that：Electric current is mutual
The input of the A phase, B phase, C phase of sensor isolated array is defeated by a relay and three-phase standard source A phase, B phase, C phase respectively
Enter end to be connected, the output end of A phase, B phase, C phase passes through a relay and three-phase standard source A phase, B phase, C phase output end phase respectively
Even, it is characterised in that：The input of the N phases of current transformer isolated array is defeated by a relay and three-phase standard source A phases
Enter end to be connected, the output end of the N phases of current transformer isolated array is connected with three-phase standard source A phase output terminals.
4. the high-precision current signal source circuit of multrirange multistation according to claim 2, it is characterised in that：Described
Current ratio amplifier modulate circuit and the selective circuit of measuring range include resistance R1, R2, R3, R4, R5, R6, R7, R8, R10,
R11, adjustable resistance R9, R12, electric capacity C, relay J5, power amplifier chips U1 and power supply, power amplifier chips U1 advise for LM3886 models
Lattice, the selective circuit of measuring range is divided into wide range selection circuit and small-range selection circuit；
Wherein small-range selection circuit is in parallel with R10 after R11, R12 series connection, normal with it by range selective relay contact 1
Closed contact 2 is connected；Wide range selection circuit is connected after R8, R9 parallel connection with R7, normal with it by range selective relay contact 1
Contact 3 is opened to connect；
The contact 1 of measurement range selection relay connects the input of each station, while being sequentially connected resistance R1, resistance R4, and connects
Enter power amplifier chips U1 10 pin, the R4 other end is connected the R1 other ends and be connected with pin 10 with R6, output OUT terminal；
R8, R9, R10, R12 other end connect the output end of each station respectively, while resistance R2, resistance R3 are sequentially connected,
And power amplifier chips U1 3 pin are accessed, the R3 other end is connected with R6, output OUT terminal；The R1 other ends are connected with pin 9.
5. the high-precision current signal source circuit of multrirange multistation according to claim 4, it is characterised in that：Power amplifier core
Piece U1 1 pin connects the+24V of external dc power, and U1 2 pin are empty, U1 3 pin connection resistance R6, R3, U1 4 pin connection
- the 24V of external dc power, U1 5 pin connect the+24V of external dc power, and U1 6 pin are empty, U1 7 pin connection electric capacity C
And be grounded, the electric capacity C other end and U1 8 pin, resistance R5 connections, the resistance R5 other end and the -24V of external dc power connect
Connect, U1 8 pin are connected with electric capacity C, resistance R5, and U1 9 pin are connected with resistance R2, R3, and U1 10 pin are connected with resistance R1, R4,
U1 11 pin are empty.
6. selective circuit of measuring range according to claim 4 and current ratio amplifier modulate circuit, it is characterised in that described
Resistance R1, R2, R3, R4, R5, R6, R7, R8, R10, R11 are manganese-copper filament resistance.
7. selective circuit of measuring range according to claim 1 and current ratio amplifier modulate circuit, it is characterised in that：Multrirange
The output end of the high-precision current signal source circuit of multistation is directly connected to the test product of five stations.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164387A (en) * | 2018-09-30 | 2019-01-08 | 国电南瑞南京控制系统有限公司 | Generator unit stator winding Injection Current measurement method based on big small-range CT |
| CN109507460A (en) * | 2018-11-27 | 2019-03-22 | 国网江苏省电力有限公司电力科学研究院 | The test method and system of three-phase standard ground electric signal generation method, device and one or two fusion switch Earth Fault Detection functions |
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