CN209590122U - Analog-to-digital conversion signal sample circuit in a kind of Wound type motor protector - Google Patents
Analog-to-digital conversion signal sample circuit in a kind of Wound type motor protector Download PDFInfo
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- CN209590122U CN209590122U CN201920237270.2U CN201920237270U CN209590122U CN 209590122 U CN209590122 U CN 209590122U CN 201920237270 U CN201920237270 U CN 201920237270U CN 209590122 U CN209590122 U CN 209590122U
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Abstract
The utility model is suitable for electric motor protecting technical field; provide analog-to-digital conversion signal sample circuit in a kind of Wound type motor protector; circuit is made of current transformer, I/V conversion circuit and A/D converter; the input terminal of current transformer and the current output line of motor connect; the output end of current transformer is connect with the input terminal of I/V conversion circuit; the input of the output end and A/D converter of I/V conversion circuit connects, and the output end of A/D converter and the controller of motor protecter connect.Pass through serial analog-to-digital conversion; the analog signal of sampling is converted into digital signal; signal strong antijamming capability; stablize; it is of good reliability; by repetition test, having well solved the analog signal method of sampling, it samples the defects of interference is big, stability is poor, is fully able to meet the signal sampling requirement in Wound type motor protector.
Description
Technical field
The utility model belongs to electric motor protecting technical field, provides analog-to-digital conversion letter in a kind of Wound type motor protector
Number sample circuit.
Background technique
With the fast development of microelectric technique, various motor protecters are also increasing currently on the market.Due to motor
Cost it is more expensive, maintenance cost is high, and is the important equipment of production, once heavy losses will be caused by breaking down, it is therefore, right
They implement to be effectively protected particularly significant.
The work characteristics of winding motor is usually used in frequent starting occasion, and starting current is big, to power grid and other equipment
Impact is big, and working environment is more severe, so failure rate is relatively high, currently, the motor protecter applied substantially is difficult completely
Protection of the foot to winding motor.The main reason is that the general electric current of protector, the temperature general analogue signal method of sampling its adopt
The defects of sample interference is big, stability is poor limits it in the protection application and development of winding motor.
Utility model content
The utility model embodiment provides analog-to-digital conversion signal sample circuit in a kind of Wound type motor protector, it is intended to solve
Certainly big, stability difference problem is interfered in analog signal sampling.
The utility model provides analog-to-digital conversion signal sample circuit in a kind of Wound type motor protector, and the circuit is by electricity
Current transformer, I/V conversion circuit and A/D converter composition, the input terminal of current transformer and the current output line of motor connect,
The output end of current transformer is connect with the input terminal of I/V conversion circuit, the output end of I/V conversion circuit and A/D converter
Input connection, the output end of A/D converter and the controller of motor protecter connect.
Further, the input terminal of A/D converter is also connect with the output end of temperature sensor.
Further, the I/V conversion circuit is made of resistance and operational amplifier, and resistance R1~R8 is fixed value resistance,
Resistance R9 and R10 be adjustable resistance, wherein an output end of current transformer by two concatenation resistance R2, resistance R4 with
The reverse input end of operational amplifier connects, another output end of current transformer by two series resistor R3, resistance R5 with
The positive input of operational amplifier connects, and the output end of operational amplifier and the input terminal of A/D converter connect, adjustable resistance
A stator pin of R10 is grounded, the output connection of another stator pin and operational amplifier, movable plate pin by resistance R6 with
Resistance R2 is connected with the intermediate node of resistance R4, and a stator pin of adjustable resistance R9 passes through resistance R8 and voltage input port
Vcc connection, another stator pin ground connection, movable plate pin are connect by resistance R7 with the intermediate node of resistance R3 and resistance R5.
By serial analog-to-digital conversion, the analog signal of sampling is converted into digital signal, signal strong antijamming capability is stablized
Good, of good reliability, by repetition test, having well solved the analog signal method of sampling, it samples big, stability difference of interference etc.
Defect is fully able to meet the signal sampling requirement in Wound type motor protector.
Detailed description of the invention
Fig. 1 is the knot of analog-to-digital conversion signal sample circuit in Wound type motor protector provided by the embodiment of the utility model
Structure schematic diagram；
Fig. 2 is the structural schematic diagram of I/V conversion circuit provided by the embodiment of the utility model；
1. current transformer, 2.I/V conversion circuit, 3.A/D converter, 4. controllers, 5. temperature sensors.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Fig. 1 is the knot of analog-to-digital conversion signal sample circuit in Wound type motor protector provided by the embodiment of the utility model
Structure schematic diagram is only illustrated in the relevant part of the utility model embodiment for ease of description.
The circuit includes:
Current transformer 1, I/V conversion circuit 2 and A/D converter 3, wherein the input terminal of current transformer 1 and motor
Current output line connection, the output end of current transformer 1 connect with the input terminal of I/V conversion circuit 2, I/V conversion circuit 2 it is defeated
Outlet is connect with the input of A/D converter 3, and the output end of A/D converter 3 and the controller 4 of motor protecter connect, controller
4 use single chip computer AT 89S53, the model of A/D converter are as follows: TLC2543；The high current that current transformer 1 exports motor is believed
Number it is converted into 4~20mA low current signal, 0~5V electricity is being converted for 4~20mA low current signal by I/V conversion circuit 2
Signal is pressed, voltage signal at this time is analog signal, then is converted into digital signal through A/D converter 3, inputs motor protecter
Controller 4 carries out overcurrent identification.
In the present invention, the input terminal of A/D converter 3 is also connect with the output end of temperature sensor 5, temperature sensing
Device 5 is used to acquire the temperature of motor, and what temperature sensor 5 exported is analog voltage signal, is converted to number through A/D converter 3
Signal, the controller 4 for inputting motor protecter carry out excess temperature identification.
Fig. 2 is that the structural schematic diagram of I/V conversion circuit provided by the embodiment of the utility model only shows for ease of description
Part relevant to the utility model embodiment.
The I/V conversion circuit is made of resistance (R1~R10) and UA741 operational amplifier, and R1~R8 is fixed value resistance, R9
It is adjustable resistance with R10, wherein an output end of current transformer passes through two series resistor R2 (100K), R4 (2K) and fortune
The reverse input end connection of amplifier is calculated, another output end of current transformer passes through two series resistor R3 (100k), R5
(2k) is connect with the positive input of operational amplifier, and the output end of operational amplifier and the input terminal of A/D converter connect, electricity
The stator pin ground connection of R10 (10k), the output connection of another stator pin and operational amplifier are hindered, movable plate pin leads to
It crosses resistance R6 (200k) to connect with the intermediate node of resistance R2 and resistance R4, a stator pin of resistance R9 (10k) passes through electricity
Resistance R8 (100k) is connect with voltage input port Vcc (- 15V), another stator pin ground connection, movable plate pin passes through resistance R7
(200k) is connect with the intermediate node of resistance R3 and resistance R5, and electric current Ii flows through resistance R1~R5, and the two of resistance R4 and resistance R5
End generates voltage U, and operational amplifier voltage U carries out differential amplification, and adjustable resistance R9 is used for returning to zero, to eliminate the zero of circuit
Point tolerance, adjustable resistance R10 are for adjusting amplification factor.
By serial analog-to-digital conversion, the analog signal of sampling is converted into digital signal, signal strong antijamming capability is stablized
Good, of good reliability, by repetition test, having well solved the analog signal method of sampling, it samples big, stability difference of interference etc.
Defect is fully able to meet the signal sampling requirement in Wound type motor protector.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (3)
1. analog-to-digital conversion signal sample circuit in a kind of Wound type motor protector, which is characterized in that the electricity routing current is mutual
Sensor, I/V conversion circuit and A/D converter composition, the input terminal of current transformer and the current output line of motor connect, electric current
The output end of mutual inductor is connect with the input terminal of I/V conversion circuit, the input of the output end and A/D converter of I/V conversion circuit
Connection, the output end of A/D converter and the controller of motor protecter connect.
2. analog-to-digital conversion signal sample circuit in Wound type motor protector as described in claim 1, which is characterized in that A/D turns
The input terminal of parallel operation is also connect with the output end of temperature sensor.
3. analog-to-digital conversion signal sample circuit in Wound type motor protector as described in claim 1, which is characterized in that the I/
V conversion circuit is made of resistance and operational amplifier, and resistance R1~R8 is fixed value resistance, and resistance R9 and R10 are adjustable resistance,
In, the reverse input end of resistance R2, resistance R4 and operational amplifier that an output end of current transformer is concatenated by two connect
It connects, another output end of current transformer is connected by the positive input of two series resistor R3, resistance R5 and operational amplifier
It connects, the output end of operational amplifier and the input terminal of A/D converter connect, the stator pin ground connection of adjustable resistance R10, separately
The output of one stator pin and operational amplifier connects, and movable plate pin passes through the intermediate node of resistance R6 and resistance R2 and resistance R4
One stator pin of connection, adjustable resistance R9 is connect by resistance R8 with voltage input port Vcc, another stator pin connects
Ground, movable plate pin are connect by resistance R7 with the intermediate node of resistance R3 and resistance R5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920237270.2U CN209590122U (en) | 2019-02-25 | 2019-02-25 | Analog-to-digital conversion signal sample circuit in a kind of Wound type motor protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920237270.2U CN209590122U (en) | 2019-02-25 | 2019-02-25 | Analog-to-digital conversion signal sample circuit in a kind of Wound type motor protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209590122U true CN209590122U (en) | 2019-11-05 |
Family
ID=68356311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920237270.2U Expired - Fee Related CN209590122U (en) | 2019-02-25 | 2019-02-25 | Analog-to-digital conversion signal sample circuit in a kind of Wound type motor protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209590122U (en) |
-
2019
- 2019-02-25 CN CN201920237270.2U patent/CN209590122U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191105 Termination date: 20210225 |
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| CF01 | Termination of patent right due to non-payment of annual fee |