CN207741885U - A kind of high accuracy pressure transmitter with the reversed protection of power supply - Google Patents
A kind of high accuracy pressure transmitter with the reversed protection of power supply Download PDFInfo
- Publication number
- CN207741885U CN207741885U CN201721836245.3U CN201721836245U CN207741885U CN 207741885 U CN207741885 U CN 207741885U CN 201721836245 U CN201721836245 U CN 201721836245U CN 207741885 U CN207741885 U CN 207741885U
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- CN
- China
- Prior art keywords
- resistance
- diode
- connect
- amplifier
- pressure transmitter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model provides a kind of high accuracy pressure transmitter with the reversed protection of power supply; it include the power circuit being connect with the power interface of pressure transmitter circuit; power circuit includes the rectifier circuit being connect with DC power supply; the rectifier circuit includes the first diode, the second diode, third diode, the 4th diode; first diode is connected with the cathode of third diode; connect the anode of pressure transmitter circuit power interface; after the anode connection of second diode and the 4th diode, the cathode of pressure transmitter circuit power interface is connected；One end that the both ends of input power are separately connected positive one end being connect with the cathode of the 4th diode of the first diode, the anode of the second diode is connect with the cathode of third diode.Utility model can still be worked normally in the case where power supply is reversed, and at low cost, debugging is conveniently.
Description
Technical field
The utility model is related to a kind of pressure transmitters more particularly to a kind of high-precision power to become regardless of the pressure of positive and negative anodes
Send device.
Background technology
Pressure transmitter is by load cell（Such as pressure sensor）, measuring circuit, process connector composition, can
The physical pressure of gas, liquid that load cell is experienced is converted into electric signal, measures, indicate, adjust
Operation.
Pressure transmitter in power supply process, will produce due to voltage it is reversed caused by short circuit or can not working condition.
Utility model content
The utility model provide a kind of power supply it is reversed in the case of the pressure transmitter that can still work normally, it is existing to solve
The problem of with the presence of technology.
The utility model uses following technical scheme：
A kind of high accuracy pressure transmitter with the reversed protection of power supply, includes the power interface with pressure transmitter circuit
The power circuit of connection, the power circuit include the rectifier circuit being connect with DC power supply, and the rectifier circuit includes
First diode VD1, the second diode VD2, third diode VD3, the 4th diode VD4, the first diode VD1 and
The cathode of three diode VD3 is connected, and connects the anode of pressure transmitter circuit power interface, the second diode VD2 and the four or two
After the anode connection of pole pipe VD4, the cathode of pressure transmitter circuit power interface is connected；The both ends of input power are separately connected
The anode and the three or two of one end, the second diode VD2 that the anode of one diode VD1 is connect with the cathode of the 4th diode VD4
One end of the cathode connection of pole pipe CD3.
The pressure transmitter circuit includes the measuring signal input terminal IN of receiving sensor signal, in pressure transmitter electricity
When the measuring signal input terminal IN on road is connect with capacitance type sensor, the positive pole connection power supply electricity of measuring signal input terminal IN
Road, when the measuring signal input terminal IN of pressure transmitter circuit is connect with resistance sensor, measuring signal input terminal IN's
Positive pole connects the anode of constant-current source circuit, and the measuring signal input terminal IN has grounding pin.
The electrode input end and negative input for the sensor signal that the measuring signal input terminal obtains are separately connected the
One end of one capacitance C1 and the other end, wherein one end of the first capacitance C1 connects the in-phase input end of the first amplifier U1A, the
The other end of one capacitance C1 connects the in-phase input end of the second amplifier U1B, and the inverting input of the second amplifier U1B leads to successively
The inverting input that second resistance R2, first resistor R1, the first variable resistance RP1 stator pins connect the first amplifier U1A is crossed,
The output end of first amplifier U1A is by the movable plate pin of 3rd resistor R3 connection variable resistances RP, and first puts
Two power pins, one connection power circuit of big device U1A, another ground connection, while the output end of the first amplifier U1A is logical
The in-phase input end of one end and third amplifier U1C of the 7th resistance R7 of the 4th resistance R4 connections is crossed, first resistor R7's is another
End is connect with one end of one end of the 9th resistance R9, the tenth resistance R10, the other end ground connection of the 9th resistance R9, the tenth resistance R10
The other end pass through the second adjustable resistance RP2 connection power circuits；
The inverting input of third amplifier U1C passes through the 6th resistance R6, the 4th resistance R4 the second amplifiers of connection U1B
The output end of inverting input, the second amplifier U1B is connected between the 6th resistance R6, the 4th resistance R4；Third amplifier U1C
The output end inverting input that passes through the 9th resistance R9 connection third amplifiers U1C；The output end of third amplifier U1C is simultaneously
Pass through one end of the in-phase input end of the 4th amplifier U1D of eleventh resistor R11 connections, twelfth resistor R12, twelfth resistor
The base stage of the output end connecting triode Q4 of the other end connection negative output terminal POW-, the 4th amplifier U1D of R12, triode Q4
Collector connect positive output end POW+, the emitter of triode Q4 passes through thirteenth resistor R13, the 14th resistance R14 connections
Negative output terminal POW-, the inverting input of the 4th amplifier U1D are connected between thirteenth resistor R13 and the 14th resistance R14.
The power supply circuit includes the voltage-stablizer U2 being connect with power circuit, and the 8th pin Vin connections of voltage-stablizer U2 are negative
The parallel connection that input terminal POW- and measuring signal output end OUT, negative output terminal POW- pass through the first diode D1 and third capacitance C3
After circuit, on the one hand it connect with measuring signal output end OUT, is on the other hand connect with rectifier bridge D2, the output end of rectifier bridge D2
It is connect with measuring signal output end OUT.
The beneficial effects of the utility model：The utility model can still be worked normally in the case where power supply is reversed, and
At low cost, debugging is conveniently.
Description of the drawings
Fig. 1 is the arbitrary connection circuit figure of power supply.
Fig. 2 is measuring circuit figure.
Fig. 3 is power supply circuit.
Fig. 4 is precision constant current source circuit diagram.
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
The utility model provides a kind of pressure transmitter, includes the power circuit being connect with pressure transmitter circuit, power supply
Circuit includes the rectifier circuit being connect with DC power supply, rectifier circuit include the first diode VD1, the second diode VD2,
Third diode VD3, the 4th diode VD4, the first diode VD1 are connected with the cathode of third diode VD3, and connection pressure becomes
The anode of device circuit is sent to connect pressure transmitter circuit after the anode connection of the second diode VD2 and the 4th diode VD4
Cathode；The both ends of input power are separately connected positive one connect with the cathode of the 4th diode VD4 of the first diode VD1
It holds, one end that the anode of the second diode VD2 is connect with the cathode of third diode CD3.
Pressure transmitter circuit includes measuring signal input terminal IN, in the measuring signal input terminal IN of pressure transmitter circuit
When being connect with capacitance type sensor, the first foot of measuring signal input terminal IN connects power supply as the anode of pressure transmitter circuit
Circuit, when the measuring signal input terminal IN of pressure transmitter circuit is connect with resistance sensor, measuring signal input terminal IN
The first foot as pressure transmitter circuit anode connection constant-current source circuit anode, the third pin of measuring signal input terminal
Ground connection.Third foot, the 4th foot of measuring signal input terminal connect the output signal of sensor.
The positive input terminal and negative input end for the sensor signal that measuring signal input terminal IN is obtained are separately connected the first capacitance
One end of C1 and the other end, wherein one end of the first capacitance C1 connects the in-phase input end of the first amplifier U1A, the first capacitance
The other end of C1 connects the in-phase input end of the second amplifier U1B, and the inverting input of the second amplifier U1B passes sequentially through second
Resistance R2, first resistor R1, the first variable resistance RP1 stator pins connect the inverting input of the first amplifier U1A.
The output end of first amplifier U1A is by the movable plate pin of 3rd resistor R3 connection variable resistances RP, and first puts
Two power pins, one connection power circuit of big device U1A, another ground connection, while the output end of the first amplifier U1A is logical
The in-phase input end of one end and third amplifier U1C of the 7th resistance R7 of the 4th resistance R4 connections is crossed, first resistor R7's is another
End is connect with one end of one end of the 9th resistance R9, the tenth resistance R10, the other end ground connection of the 9th resistance R9, the tenth resistance R10
The other end pass through the second adjustable resistance RP2 connection power circuits.
The inverting input Room of third amplifier U1C passes through the 6th resistance R6, the 4th resistance R4 the second amplifiers of connection U1B
Inverting input, the output end of the second amplifier U1B is connected between the 6th resistance R6, the 4th resistance R4；Third amplifier
The inverting input that the output end of U1C passes through the 9th resistance R9 connection third amplifiers U1C；The output end of third amplifier U1C
Simultaneously by one end of the in-phase input end of the 4th amplifier U1D of eleventh resistor R11 connections, twelfth resistor R12, the 12nd
The base stage of the output end connecting triode Q4 of the other end connection negative output terminal POW-, the 4th amplifier U1D of resistance R12, three poles
The collector of pipe Q4 connects positive output end POW+, and the emitter of triode Q4 passes through thirteenth resistor R13, the 14th resistance R14
Negative output terminal POW- is connected, the inverting input of the 4th amplifier U1D is connected to thirteenth resistor R13 and the 14th resistance R14
Between.
Power supply circuit is precision constant current source U3 power supplies, while being supplied for the successive load being connect with measuring signal output end OUT
Electricity, power supply circuit include the voltage-stablizer U2 being connect with power circuit, the 8th pin Vin connection negative output terminals POW- of voltage-stablizer U2
With measuring signal output end OUT, negative output terminal POW- is by after the parallel circuit of the first diode D1 and third capacitance C3, a side
Face is connect with measuring signal output end OUT, is connect with rectifier bridge D2, output end and the measuring signal output end OUT of rectifier bridge D2
Connection.
When the measuring signal input terminal IN of pressure transmitter circuit is connect with capacitance type sensor, measuring signal input terminal
The first foot of IN passes through connector J1 connection power circuits as the anode of pressure transmitter circuit.
When the measuring signal input terminal IN of pressure transmitter circuit and resistance-type sensing connect, measuring signal input terminal IN
The first foot as pressure transmitter circuit anode connection constant-current source circuit anode；At this point, anode input POW+ connection essences
Close constant-current source U3, the positive output end for passing through connector J2 connection precision constant current sources U3 of pressure transmitter circuit.
It is also associated with connector J3 at the both ends of second resistance R2, when transducer range is 1:When 1, J3 is not attached to together,
When span shift is 1/2, short circuit connector J3.
Above-described is only preferred embodiments of the present invention, it is noted that for those skilled in the art
For, under the premise of not departing from the utility model general idea, several changes and improvements can also be made, these should also be considered as
The scope of protection of the utility model.
Claims (2)
1. a kind of high accuracy pressure transmitter with the reversed protection of power supply, it is characterised in that：Including with pressure transmitter circuit
Power interface connection power circuit, the power circuit includes the rectifier circuit being connect with DC power supply, the rectification
Bridge circuit includes the first diode（VD1）, the second diode（VD2）, third diode（VD3）, the 4th diode（VD4）, institute
State the first diode（VD1）With third diode（VD3）Cathode be connected, connection pressure transmitter circuit power interface is just
Pole, the second diode（VD2）With the 4th diode（VD4）Anode connection after, connection pressure transmitter circuit power interface
Cathode；The both ends of input power are separately connected the first diode（VD1）Anode with the 4th diode（VD4）Cathode connection
One end, the second diode（VD2）Anode with third diode（CD3）Cathode connection one end；
The pressure transmitter circuit includes the measuring signal input terminal of receiving sensor signal（IN）, in pressure transmitter circuit
Measuring signal input terminal（IN）When being connect with capacitance type sensor, measuring signal input terminal（IN）Positive pole connect power supply
Circuit, when the measuring signal input terminal of pressure transmitter circuit（IN）When being connect with resistance sensor, measuring signal input terminal
（IN）Positive pole connection constant-current source circuit anode, the measuring signal input terminal（IN）With grounding pin.
2. a kind of high accuracy pressure transmitter with the reversed protection of power supply according to claim 1, it is characterised in that：Institute
The electrode input end and negative input for stating the sensor signal of measuring signal input terminal acquisition are separately connected the first capacitance（C1）
One end and the other end, wherein the first capacitance（C1）One end connect the first amplifier（U1A）In-phase input end, first electricity
Hold（C1）The other end connect the second amplifier（U1B）In-phase input end, the second amplifier（U1B）Inverting input successively
Pass through second resistance（R2）, first resistor（R1）, the first variable resistance（RP1）Stator pin connects the first amplifier（U1A）'s
Inverting input,
First amplifier（U1A）Output end pass through 3rd resistor（R3）Connect variable resistance（RP）Movable plate pin, and first
Amplifier（U1A）Two power pins, one connection power circuit, another ground connection, while the first amplifier（U1A）It is defeated
Outlet passes through the 4th resistance（R4）Connect the 7th resistance（R7）One end and third amplifier（U1C）In-phase input end, first
Resistance（R7）The other end and the 9th resistance（R9）One end, the tenth resistance（R10）One end connection, the 9th resistance（R9）It is another
One end is grounded, the tenth resistance（R10）The other end pass through the second adjustable resistance（RP2）Connect power circuit；
Third amplifier（U1C）Inverting input pass through the 6th resistance（R6）, the 4th resistance（R4）Connect the second amplifier
（U1B）Inverting input, the second amplifier（U1B）Output end be connected to the 6th resistance（R6）, the 4th resistance（R4）Between；
Third amplifier（U1C）Output end pass through the 9th resistance（R9）Connect third amplifier（U1C）Inverting input；Third is put
Big device（U1C）Output end simultaneously pass through eleventh resistor（R11）Connect the 4th amplifier（U1D）In-phase input end, the tenth
Two resistance（R12）One end, twelfth resistor（R12）The other end connect negative output terminal（POW-）, the 4th amplifier（U1D）'s
Output end connecting triode（Q4）Base stage, triode（Q4）Collector connect positive output end（POW+）, triode（Q4）'s
Emitter passes through thirteenth resistor（R13）, the 14th resistance（R14）Connect negative output terminal（POW-）, the 4th amplifier（U1D）'s
Inverting input is connected to thirteenth resistor（R13）With the 14th resistance（R14）Between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721836245.3U CN207741885U (en) | 2017-12-25 | 2017-12-25 | A kind of high accuracy pressure transmitter with the reversed protection of power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721836245.3U CN207741885U (en) | 2017-12-25 | 2017-12-25 | A kind of high accuracy pressure transmitter with the reversed protection of power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207741885U true CN207741885U (en) | 2018-08-17 |
Family
ID=63119508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721836245.3U Expired - Fee Related CN207741885U (en) | 2017-12-25 | 2017-12-25 | A kind of high accuracy pressure transmitter with the reversed protection of power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207741885U (en) |
-
2017
- 2017-12-25 CN CN201721836245.3U patent/CN207741885U/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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180817 Termination date: 20181225 |