CN107315143B - Multi-range multi-station high-precision current signal source circuit - Google Patents
Multi-range multi-station high-precision current signal source circuit Download PDFInfo
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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
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Abstract
The invention discloses a multi-range multi-station high-precision current signal source circuit. The invention adopts a current transformer isolation array, a measuring range selection and current proportion operational amplifier conditioning circuit to process a single-station current signal sent by a high-precision three-phase standard source. Firstly, dividing a single-station current signal source into five-station current signal sources by using a current transformer isolation array (the number of configurable stations depends on the maximum power emitted by a three-phase standard source single phase, and the design of the invention takes five stations in practical application as an example); secondly, the current signals of five stations can be subjected to large and small range selection through switching of the relay; finally, the characteristics of consistency, high linearity and high precision of the five-station current signals are ensured through the modulation of the current proportion operational amplifier conditioning circuit. The invention improves the working efficiency of the detection device by five times, effectively ensures the efficiency of quality detection of the detected product, reduces the production cost and has practical use value.
Description
Technical Field
The invention relates to a circuit in the technical field of detection, which is applied to detection of an intelligent switching device, in particular to a multi-range and multi-station high-precision current signal source circuit for an intelligent switching device, and is used for detecting whether the protection function of the intelligent switching device can work normally in practical application.
Background
For quality detection of intelligent switch electrical products, such as CW series circuit breakers, CM series trips and the like, the intelligent switch electrical products need to be subjected to factory detection on the functions of switching on and off a power system and the protection control functions of various faults of overload, undervoltage, short circuit, grounding faults and the like of equipment. The detection device needs to provide various analog voltage and current signals to be input into the intelligent switch electrical appliance product so as to check whether the function of the intelligent switch electrical appliance product is normal. However, the traditional inspection mode can only be used in a single-person single-station mode, and has the defects of low detection efficiency, low detection precision and high false detection rate for large-batch intelligent switch electrical products.
Disclosure of Invention
Object of the invention.
The invention aims to solve the problem that the high-efficiency detection of multiple stations of an intelligent switch electrical product cannot be realized in the prior art, so that a multi-range and multi-station high-precision current signal source circuit is provided and designed, and the detection efficiency and precision are improved in practical application.
The technical scheme adopted by the invention is as follows.
The invention provides a multi-range multi-station high-precision current signal source circuit which comprises a current transformer isolation array circuit, a range selection circuit and a current proportion operational amplifier conditioning circuit, wherein the current transformer isolation array circuit is connected with the current transformer isolation array circuit; the external three-phase standard source sends out current to input the current transformer isolation array circuit, the current transformer isolation array circuit outputs A, B, C, N four-phase current signals, each phase is divided into five paths of current signals, the five paths of current signals are respectively connected with the range selection circuit, and the range selection circuit is connected with the current proportion operational amplifier conditioning circuit to be finally output.
In a further specific embodiment, the current transformer isolation array outputs A, B, C, N four-phase current transformer isolation array current signals, the current signals of each phase are divided into five stations, each station adopts a current transformer, the input ends of the five stations are connected in series, the output ends of the five stations are respectively connected with a measuring range selection circuit, and each measuring range selection circuit is respectively connected with a current proportion operational amplifier conditioning circuit.
In a further specific embodiment, the input ends of the A phase, the B phase and the C phase of the current transformer isolation array are respectively connected with the output ends of the A phase, the B phase and the C phase of the three-phase standard source through three relays J1, J3 and J4 (a circuit is shown in fig. 1), and the function of each relay is to ensure that the current emission of the A phase, the B phase and the C phase can be controlled by an upper computer software program to be selectively connected or disconnected according to the requirement. The input end of the N phases of the current transformer isolation array is connected with the output end of the A phase of the three-phase standard source through a relay J2. Here, it is necessary to explain: the A-phase current and N-phase current generating circuit multiplexes the A-phase output port of the three-phase standard source, the A-phase current and N-phase current generating circuit can not work simultaneously, namely J1 and J2 can not be closed simultaneously in the detection process, the normal detection flow is to firstly pass A, B, C three-phase current, then open J1, close J2 and independently pass N-phase current;
in a further specific embodiment, the current proportion operational amplifier conditioning circuit and the range selection circuit comprise resistors R1, R2, R3, R4, R5, R6, R7, R8, R10 and R11, adjustable resistors R9 and R12, a capacitor C, a relay J5, a power amplifier chip U1 and a power supply, wherein the power amplifier chip U1 is of model LM3886, and the range selection circuit is divided into a wide range selection circuit and a small range selection circuit;
the small-range selection circuit is connected in parallel with R10 after being connected in series by R11 and R12, and is communicated with a normally closed contact 2 of the range selection relay through a contact 1; the wide-range selection circuit is connected in parallel by R8 and R9 and then connected in series with R7, and is communicated with a normally open contact 3 of the range selection relay through a contact;
the contact 1 of the range selection relay is connected with the input end of each station, and simultaneously is sequentially connected with a resistor R1 and a resistor R4, and is connected with the 10 pin of the chip U1, the other end of the R4 is connected with the R6 and the output OUT end, and the other end of the R1 is connected with the pin 10;
the other ends of R8, R9, R10 and R12 are respectively connected with the output end of each station, and simultaneously are sequentially connected with a resistor R2 and a resistor R3, and are connected with a3 pin of a power amplifier chip U1, and the other ends of R3 are connected with an R6 and an output OUT end; the other end of R1 is connected with pin 9.
In a further specific embodiment, pin 1 of the power amplification chip U1 is connected with +24V of an external direct current power supply, pin 2 of the U1 is empty, pin 3 of the U1 is connected with resistors R6 and R3, pin 4 of the U1 is connected with +24V of the external direct current power supply, pin 5 of the U1 is connected with +24V of the external direct current power supply, pin 6 of the U1 is empty, pin 7 of the U1 is connected with a capacitor C and grounded, the other end of the capacitor C is connected with pin 8 and resistor R5 of the chip U1, the other end of the resistor R5 is connected with-24V of the external direct current power supply, pin 8 of the U1 is connected with the capacitor C and resistor R5, pin 9 of the U1 is connected with resistors R2 and R3, pin 10 of the U1 is connected with resistors R1 and R4, and pin 11 of the U1 is empty.
In still further embodiments, the resistors R1, R2, R3, R4, R5, R6, R7, R8, R10, R11 are manganese-copper wire resistors.
In a further specific embodiment, the output end of the multi-range multi-station high-precision current signal source circuit is directly connected with the tested product with five stations.
The invention has the technical effects.
(1) The invention can realize multi-station and multi-range detection by isolating the array circuit through the current transformer.
(2) The invention can ensure the consistency of current signals and further expand the multi-range measurement mode through the arrangement of the large and small range circuits of the current transformer isolation array circuit and the range selection circuit.
(3) The current transformer isolation array circuit and the measuring range circuit can adaptively adjust the current output by the current proportional operational amplifier conditioning circuit, and the application range is wider.
(4) The multi-station is respectively connected with the measuring range selection circuit, so that the current output signals are completely and independently isolated, and the multi-station mutual isolation is realized, and the multi-station temperature compensation electromagnetic interference resistance device has the characteristics of temperature compensation, electromagnetic interference resistance and the like.
(5) The five in-phase current transformers in the current transformer isolation array circuit are connected in series, so that the in-phase branching effect (divided into five stations) of the three-phase standard source single-phase current can be realized, the consistency and linearity of the in-phase five-way generated current can be realized through the effect of the current proportion operational amplifier conditioning circuit in the subsequent five ways, and the detection consistency of the input test current of the five-station product is ensured. According to the detection precision requirement of the product (the error cannot exceed five thousandths), the method is realized and can meet the design requirement in practical application.
In conclusion, the invention is used in the field of multi-station product testing, and can further improve the reliability and testing precision of the inspection system, improve the production efficiency and reduce the production cost.
Drawings
FIG. 1 is a circuit diagram of a current transformer isolation array of the present invention;
fig. 2 is a diagram of a range selection circuit and current proportional op amp conditioning circuit of the present invention.
Fig. 3 is a logical block diagram of the present invention.
Detailed Description
1. As shown in FIG. 3, the multi-range multi-station high-precision current signal source circuit provided by the invention comprises a current transformer isolation array circuit, a range selection circuit and a current proportion operational amplifier conditioning circuit; the external three-phase standard source sends out current to input the current transformer isolation array circuit, the current transformer isolation array circuit outputs A, B, C, N four-phase current signals, each phase is divided into five paths of current signals, the five paths of current signals are respectively connected with the range selection circuit, and the range selection circuit is connected with the current proportion operational amplifier conditioning circuit to be finally output. Through the arrangement of a plurality of stations and a plurality of measuring ranges, the detection efficiency and the detection precision of products are improved.
2. The specific implementation of the key component module: the current transformer isolates the array.
The current transformer isolation array circuit is composed of A, B, C, N four-phase current source circuits. Wherein:
(1) The positive terminal of the A-phase current source is generated by a three-phase standard source current +ia terminal, the A-phase current source is connected with five current transformers A1, A2, A3, A4 and A5 in series through a relay J1, and the negative terminal of the A-phase current source is connected with the three-phase standard source current-ia terminal.
(2) The positive terminal of the B-phase current source is generated by a three-phase standard source current +ib terminal, the B-phase current source is connected with five current transformers B1, B2, B3, B4 and B5 in series through a relay J3, and the negative terminal of the B-phase current source is connected with the three-phase standard source current-ib terminal.
(3) The positive terminal of the C-phase current source is generated by a three-phase standard source current +ic terminal, the three-phase standard source current +ic terminal is connected with five current transformers C1, C2, C3, C4 and C5 in series through a relay J4, and the negative terminal is connected with the three-phase standard source current-ic terminal.
(4) The positive terminal of the N-phase current source is generated by a three-phase standard source current +ia terminal, the positive terminal of the N-phase current source is connected with five current transformers N1, N2, N3, N4 and N5 in series through a relay J2, and the negative terminal of the N-phase current source is connected with the three-phase standard source current-ia terminal.
As shown in fig. 1, the current transformer isolation array of the invention is composed of 20 current transformers in total of A, B, C, N four phases and five stations, the input ends of the current transformers in each column are connected in series, and the output ends of the current transformers are connected with a measuring range selection circuit and a current proportion operational amplifier conditioning circuit.
The input ends of the A phase, the B phase and the C phase of the current transformer isolation array are respectively connected with the output ends of the A phase, the B phase and the C phase of the three-phase standard source through three relays J1, J3 and J4, and the function of each relay is to ensure that the current emission of the A phase, the B phase and the C phase can be controlled by an upper computer software program, and the connection or the disconnection is selected according to the needs. The input end of the N phases of the current transformer isolation array is connected with the output end of the A phase of the three-phase standard source through a relay J2.
Here, it is necessary to explain: the A-phase current and N-phase current generating circuit multiplexes the A-phase output port of the three-phase standard source, the A-phase current and N-phase current generating circuit can not work simultaneously, namely J1 and J2 can not be closed simultaneously in the detection process, the normal detection flow is to firstly pass A, B, C three-phase current, then open J1, close J2 and independently pass N-phase current;
the current transformer isolation array outputs A, B, C, N four-phase current transformer isolation array current signals, the current signals of each phase are divided into five stations, each station adopts a current transformer, the input ends of the five stations are connected in series, the output ends of the five stations are respectively connected with a measuring range selection circuit, and each measuring range selection circuit is respectively connected with a current proportion operational amplifier conditioning circuit. The output end of the multi-range multi-station high-precision current signal source circuit is directly connected with the tested product of five stations. When the 20 current transformers act, every 5 current transformers are connected in series, and certain unidirectional current of the three-phase standard source is divided into five paths of in-phase current; a total of A, B, C, N four-phase generation circuits are required, so 20 current transformers are required to form a current isolation array.
What needs to be explained here is: the current transformer isolation array is a key component module, and the current source devices of the current multichannel (high-precision current sources with more than 5 channels) on the market are few, the cost is high, and the number of channels is not easy to expand. The design of the invention utilizes a specially-customized high-precision current transformer (the conversion ratio is 1A:20mA, the precision is five parts per million), and the three-phase standard source single-phase current (the precision is two parts per million) is successfully divided into five paths of current channels, and the key technology relates to the wiring mode, temperature compensation and the like of the circuit. For consistency of five paths of output currents, because the parameters of the 20 current transformers cannot be completely consistent, certain errors are caused on the parameters of five paths of currents on one station, and according to design requirements, the input current precision of a product cannot exceed five thousandths, and a current proportional operational amplifier circuit is required to be configured for a subsequent circuit. 3. Implementation of key conditioning circuitry: the current proportion operational amplifier conditioning circuit and the measuring range selection circuit.
(1) Action
(1) The current proportion operational amplifier conditioning circuit has the functions that: the five currents input by the current transformer isolation array are subjected to consistency adjustment, so that the five currents on one station are almost consistent, and the error is no more than five thousandths. And the output current can be amplified by adjusting and changing the input resistance Ri of the current proportion operational amplifier conditioning circuit, so that the requirement of the testing range of the product is met, and the input current range of the product is between 2mA and 800 mA.
(2) The measuring range selection circuit is arranged for matching with the current proportion operational amplifier conditioning circuit, the real change of the large measuring range and the small measuring range is that the input resistance Ri is changed, the current operational amplifier multiple of the large measuring range is 7.5 times, the small measuring range is 1.5 times, the input current range of the product is divided into two interval sections, namely a2 mA-150 mA (small measuring range) range section and a 100 mA-800 mA (large measuring range) range section, and the two range sections have intersection, so that the current of the input product has good consistency, linearity and sensitivity in the respective interval sections.
(2) As shown in fig. 2, a phase a current of a station is taken as an example to describe a connection mode and an operation mode of the current proportion operational amplifier conditioning circuit and the range selection circuit.
(1) Connection mode and working mode of core power amplifier chip U1: the resistor R1 is connected with the resistor R4 and the 10 pin of the power amplifier chip U1 (LM 3886), and the other end of the resistor R4 is connected with the R6 and the output OUT end. The other end of R6 is connected with 3 pins of U1 and a resistor R3, the other end of the resistor R3 is connected with 9 pins of R2 and U1, and the other end of R2 is connected with-ia 1. The U1 pin is connected with +24V of an external direct current power supply, the U1 pin 2 is empty, the U1 pin 3 is connected with resistors R6 and R3, the U1 pin 4 is connected with-24V of the external direct current power supply, the U1 pin 5 is connected with +24V of the external direct current power supply, the U1 pin 6 is empty, the U1 pin 7 is connected with a capacitor C and grounded, the other end of the capacitor C is connected with the U1 pin 8 and a resistor R5, the other end of the resistor R5 is connected with-24V of the external direct current power supply, the U1 pin 8 is connected with the capacitor C and the resistor R5, the U1 pin 9 is connected with the resistors R2 and R3, the U1 pin 10 is connected with the resistors R1 and R4, and the U1 pin 11 is empty. The partial circuit is a current proportion operational amplifier conditioning circuit, and U1 is of model LM 3886. The resistors R1, R2, R3, R4, R5, R6, R7, R8, R10 and R11 are manganese copper wire resistors.
The power amplifier chip U1 has the advantages of high output power (68W continuous output power), small distortion degree (total distortion plus noise is less than 0.03%), complete protection functions (including overvoltage protection, overheat protection, current limitation, temperature limitation, loudspeaker impact protection and noise reduction functions during switching power supply), few peripheral elements, easy manufacture and debugging and stable and reliable work. In the circuit design of the invention, the circuit is a key device for amplifying current. After the peripheral balance resistor r1=r2 and r3=r4 are selected, the power amplifier chip U1 amplifies the multiple ai=ri/Ro of the current, wherein Ri is the resistance value of the large and small measuring ranges of the input end, and Ro is the resistance value of the output end R6.
(2) Connection mode and working mode of small-range selection circuit: +ia1 is connected with resistor R1 and 1 contact of relay J5, normally closed contact 2 of relay J5 is connected with one end of resistor R10, R11, adjustable resistor R12 is connected with the other end of resistor R11, namely R11 is connected in series with R12 and then connected with R10 in parallel, the other end of resistor R10 and adjustable resistor R12 is connected with-ia 1, and the partial circuit is a small-range selection circuit.
According to the serial-parallel connection relation of the small-range circuit and the input-output relation of the amplification current multiple of the power amplification chip U1, the current proportion adjustment multiple of the small range can be obtained as follows:
(3) connection mode and working mode of wide range selection circuit: the normally open contact 3 of the relay J5 is connected with a resistor R7, the other end of the resistor R7 is simultaneously connected with a resistor R8 and an adjustable resistor R9, the other ends of the resistor R8 and the adjustable resistor R9 are connected with-ia 1, and the part of the circuit is a wide-range selection circuit.
According to the serial-parallel connection relation of the wide-range circuit and the input-output relation of the amplification current multiple of the power amplification chip U1, the current proportion adjustment multiple of the wide-range circuit can be obtained as follows:
through adjusting the resistance values of the corresponding adjustable resistors R12 and R9, the size range of the output current can be adjusted, and the consistency, the linearity and the sensitivity of the five-station output current can be ensured.
4. The output end of the multi-range multi-station high-precision current signal source circuit is directly connected with a tested product with five stations.
5. The multi-station (multi-channel) technology disclosed by the invention is not a simple current shunt principle, and the key technology relates to isolation, temperature compensation and electromagnetic interference resistance, and has the advantages of high precision, low cost and expandable station (channel) quantity.
6. The multi-range technology is not a simple series-parallel circuit principle, but is used for separating output current intervals from actual application in order to ensure consistency, linearity and sensitivity of input current of a test product. The resistance value of the adjustable resistor is 10 ohms, and in the circuit design, the adjustable resistor is connected with a resistor with the resistance value of R8=1 ohms (small measuring range) in parallel, and the resistance value of R10=1 ohms (large measuring range) so that the adjustable range is between 0 and 1 ohms, and the adjustable resistor is suitable for fine adjustment of current, thereby ensuring the consistency of the current.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (5)
1. A multi-range multi-station high-precision current signal source circuit comprises a current transformer isolation array circuit, a range selection circuit and a current proportion operational amplifier conditioning circuit; the external three-phase standard source sends out current to input the current transformer isolation array circuit is characterized in that: the current transformer isolation array circuit outputs A, B, C, N four-phase current signals, each phase is divided into five paths of current signals, the five paths of current signals are respectively connected with the range selection circuit, and the range selection circuit is connected with the current proportion operational amplifier conditioning circuit to be finally output;
the input ends of the A phase, the B phase and the C phase of the current transformer isolation array are respectively connected with the output ends of the A phase, the B phase and the C phase of the three-phase standard source through a relay, and the input end of the N phase of the current transformer isolation array is connected with the output end of the A phase of the three-phase standard source through a relay;
the current proportion operational amplifier conditioning circuit and the range selection circuit comprise resistors R1, R2, R3, R4, R5, R6, R7, R8, R10 and R11, adjustable resistors R9 and R12, a capacitor C, a relay J5, a power amplifier chip U1 and a power supply, wherein the power amplifier chip U1 is of LM3886 type specification, and the range selection circuit is divided into a wide range selection circuit and a small range selection circuit;
the small-range selection circuit is connected in parallel with R10 after being connected in series by R11 and R12, and is communicated with the normally closed contact 2 of the small-range selection circuit through the range selection relay contact 1; the wide-range selection circuit is connected in parallel by R8 and R9 and then connected in series with R7, and is communicated with the normally open contact 3 through the range selection relay contact 1;
the contact 1 of the range selection relay is connected with the input end of each station, and is sequentially connected with a resistor R1 and a resistor R4, and is connected with the 10 pin of the power amplifier chip U1, the other end of the R4 is connected with the R6 and the output OUT end, and the other end of the R1 is connected with the pin 10;
the other ends of R8, R9, R10 and R12 are respectively connected with the output end of each station, and simultaneously are sequentially connected with a resistor R2 and a resistor R3, and are connected with a3 pin of a power amplifier chip U1, and the other ends of R3 are connected with an R6 and an output OUT end; the other end of R1 is connected with pin 9.
2. The multi-range multi-station high precision current signal source circuit according to claim 1, wherein: the current transformer isolation array outputs A, B, C, N four-phase current transformer isolation array current signals, the current signals of each phase are divided into five stations, each station adopts a current transformer, the input ends of the five stations are connected in series, the output ends of the five stations are respectively connected with a measuring range selection circuit, and each measuring range selection circuit is respectively connected with a current proportion operational amplifier conditioning circuit.
3. The multi-range multi-station high precision current signal source circuit according to claim 1, wherein: the power amplifier chip U1 is connected with +24V of an external direct current power supply through the 1 pin, the 2 pin of U1 is empty, the 3 pin of U1 is connected with resistors R6 and R3, the 4 pin of U1 is connected with +24V of the external direct current power supply, the 5 pin of U1 is connected with +24V of the external direct current power supply, the 6 pin of U1 is empty, the 7 pin of U1 is connected with a capacitor C and grounded, the other end of the capacitor C is connected with the 8 pin of U1 and a resistor R5, the other end of the resistor R5 is connected with-24V of the external direct current power supply, the 8 pin of U1 is connected with the capacitor C and the resistor R5, the 9 pin of U1 is connected with resistors R2 and R3, the 10 pin of U1 is connected with the resistors R1 and R4, and the 11 pin of U1 is empty.
4. The multi-range multi-station high-precision current signal source circuit according to claim 1, wherein the resistors R1, R2, R3, R4, R5, R6, R7, R8, R10 and R11 are manganese-copper wire resistors.
5. The multi-range multi-station high precision current signal source circuit according to claim 1, wherein: the output end of the multi-range multi-station high-precision current signal source circuit is directly connected with the tested product of five stations.
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| 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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