CN2788162Y - Differential pressure measuring circuit used to cleanse operating station - Google Patents
Differential pressure measuring circuit used to cleanse operating station Download PDFInfo
- Publication number
- CN2788162Y CN2788162Y CN 200520040408 CN200520040408U CN2788162Y CN 2788162 Y CN2788162 Y CN 2788162Y CN 200520040408 CN200520040408 CN 200520040408 CN 200520040408 U CN200520040408 U CN 200520040408U CN 2788162 Y CN2788162 Y CN 2788162Y
- Authority
- CN
- China
- Prior art keywords
- resistance
- circuit
- input
- amplifier
- output
- 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 - Lifetime
Links
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
The utility model relates to a differential pressure measuring circuit used for purifying an operating station, which comprises a power supply, a pressure sensor and an amplifying circuit. The utility model is characterized in that the pressure sensor is a silicon pressure sensor, the output of which is a wheatstone bridge circuit, the output of the pressure sensor is connected with the input of a differential input circuit and the output of which is connected with the input of the amplifying circuit. The silicon pressure sensor uses an accurate constant current power supply circuit for supplying the power, a silicon wafer is integrated with a compensating resistor as a gain control resistor to improve the interchange capacity and the circuit also has a zero regulating function and a gain regulating function. The utility model has the advantages of measuring error reduction, high measuring precision and low cost.
Description
Technical field
The utility model relates to a kind of pressure differential metering circuit, particularly a kind of differential pressure measurement circuit that is used for the clean bench high efficiency particulate air.
Background technology
By the differential pressure measurement of clean bench plenum chamber being differentiated the change in resistance situation of high efficiency particulate air, and the device of existing differential pressure measurement, because the design of input circuit, amplifying circuit, power supply is not ideal enough in the selection of sensor itself and the differential pressure measurement circuit, or measuring accuracy is poor or poor repeatability, or interchangeability is poor, or cost is higher or the like, is difficult in actual use promote.
Summary of the invention
The purpose of this utility model has provided a kind of differential pressure measurement circuit that is used for clean bench plenum chamber screen pack, the device that has solved existing differential pressure measurement is owing to the design of input circuit, amplifying circuit, power supply in sensor selection itself and the differential pressure measurement circuit is not ideal enough, that exist or measuring accuracy is poor or poor repeatability, or interchangeability is poor, or higher or the like the problem that has much room for improvement of cost.A kind of differential pressure measurement circuit that is used for clean bench of the utility model design, comprise power supply, pressure transducer, amplifying circuit, it is characterized in that: pressure transducer is a silicon pressure sensor, integrated compensating resistance R0 on its silicon chip, it is output as Wheatstone bridge circuit, Wheatstone bridge circuit is adopted the constant-current power supply circuit power supply, and the output of pressure transducer connects differential input amplifying circuit input, and the output of differential input amplifying circuit connects the input of amplifying circuit.Described constant-current power supply circuit is made up of comparer IC1, resistance R 1, R2, R3, triode Tr1, stabilivolt Z1, wherein, the negative pole of stabilivolt Z1 and resistance R 3 connect power Vcc, the positive input of anodal and connecting resistance R2 and the comparer IC1 of stabilivolt Z1, the other end ground connection of resistance R 2, the other end of resistance R 3 also connects the negative input of comparer IC1 and the emitter of triode Tr1, be connected to resistance R 1 between the output terminal of the base stage of triode Tr1 and comparer IC1, the collector of triode Tr1 connects pressure transducer as the output of constant-current power supply circuit.Described differential amplifier circuit is made up of amplifier IC2, IC3, resistance R 4, R5, R6, R7, resistance R 6, R4, R0, R5, R7 connect successively, two output terminals of pressure transducer connect the positive input of amplifier IC2, IC3 respectively, the negative input connecting resistance R4 of amplifier IC2 and the contact of R0, the contact of output terminal connecting resistance R6 and R4, the negative input connecting resistance R0 of amplifier IC3 and the contact of R5, the contact of output terminal connecting resistance R5 and R7.Described amplifying circuit is made up of amplifier IC4, resistance R 8, R9, R10, R11, adjustable resistance W1, wherein, the negative input of amplifier IC4 and connecting resistance R8 and R6, the output terminal of another termination amplifier IC4 of resistance R 8, the positive input of amplifier IC4 and connecting resistance R9 and R7, the adjustable side of another termination adjustable resistance W1 of resistance R 9, resistance R 10, adjustable resistance W1 and resistance R 11 are serially connected between power Vcc and the ground.The utility model has the advantages that and reduced measuring error, improved measuring accuracy, and cost is lower.
Description of drawings
Accompanying drawing is an electrical block diagram of the present utility model,
Below in conjunction with drawings and Examples the utility model is elaborated,
Embodiment
Comprise power supply, pressure transducer 1, amplifying circuit, it is characterized in that: pressure transducer is a silicon pressure sensor, integrated compensating resistance R0 on its silicon chip, it is output as Wheatstone bridge circuit, Wheatstone bridge circuit is adopted accurate constant-current power supply circuit power supply, the output of pressure transducer connects differential input amplifying circuit input, and the output of differential input amplifying circuit connects the input of amplifying circuit.Described constant-current power supply circuit is made up of comparer IC1, resistance R 1, R2, R3, triode Tr1, stabilivolt Z1, wherein, the negative pole of stabilivolt Z1 and resistance R 3 connect power Vcc, the positive input of anodal and connecting resistance R2 and the comparer IC1 of stabilivolt Z1, the other end ground connection of resistance R 2, the other end of resistance R 3 also connects the negative input of comparer IC1 and the emitter of triode Tr1, be connected to resistance R 1 between the output terminal of the base stage of triode Tr1 and comparer IC1, the collector of triode Tr1 connects pressure transducer as the output of constant-current power supply circuit.Described differential input amplifying circuit is made up of amplifier IC2, IC3, resistance R 4, R5, R6, R7, resistance R 6, R4, R0, R5, R7 connect successively, two output terminals 2,3 of pressure transducer 1 connect the positive input of amplifier IC2, IC3 respectively, the negative input connecting resistance R4 of amplifier IC2 and the contact of R0, the contact of output terminal connecting resistance R6 and R4, the negative input connecting resistance R0 of amplifier IC3 and the contact of R5, the contact of output terminal connecting resistance R5 and R7.Described amplifying circuit is made up of amplifier IC4, resistance R 8, R9, R10, R11, adjustable resistance W1, wherein, the negative input of amplifier IC4 and connecting resistance R8 and R6, the output terminal of another termination comparer IC4 of resistance R 8, the positive input of amplifier IC4 and connecting resistance R9 and R7, the adjustable side of another termination adjustable resistance W1 of resistance R 9, resistance R 10, adjustable resistance W1 and resistance R 11 are serially connected between power Vcc and the ground.The compensating resistance R0 of silicon pressure sensor as gain control resistance to improve interchangeability.Circuit also has the function that adjust zero point and gain is adjusted.
Claims (5)
1, a kind of differential pressure measurement circuit that is used for clean bench, comprise power supply, pressure transducer, amplifying circuit, it is characterized in that: pressure transducer adopts the constant-current power supply circuit power supply, the output of pressure transducer connects differential input amplifying circuit input, and the output of differential input amplifying circuit connects the input of amplifying circuit.
2, a kind of differential pressure measurement circuit that is used for clean bench according to claim 1, it is characterized in that: described pressure transducer is a silicon pressure sensor, and it is output as Wheatstone bridge circuit.
3, a kind of differential pressure measurement circuit that is used for clean bench according to claim 1 and 2, it is characterized in that: described constant-current power supply circuit is by comparer IC1, resistance R 1, R2, R3, triode Tr1, stabilivolt Z1 forms, wherein, the negative pole of stabilivolt Z1 and resistance R 3 connect power Vcc, the anodal connecting resistance R2 of stabilivolt Z1 and the positive input of comparer IC1, the other end ground connection of resistance R 2, the negative input of another termination comparer IC1 of resistance R 3 and the emitter of triode Tr1, be connected to resistance R 1 between the output terminal of the base stage of triode Tr1 and comparer IC1, the collector of triode Tr1 connects pressure transducer as the output of constant-current power supply circuit.
4, a kind of differential pressure measurement circuit that is used for clean bench according to claim 1 and 2, it is characterized in that: described pressure transducer has compensating resistance R0, differential input amplifying circuit is by amplifier IC2, IC3, resistance R 4, R5, R6, R7 forms, resistance R 6, R4, R0, R5, R7 connects successively, two output terminals of pressure transducer meet amplifier IC2 respectively, the positive input of IC3, the negative input connecting resistance R4 of amplifier IC2 and the contact of R0, the contact of output terminal connecting resistance R6 and R4, the negative input connecting resistance R0 of amplifier IC3 and the contact of R5, the contact of output terminal connecting resistance R5 and R7.The compensating resistance R0 of silicon pressure sensor as gain control resistance to improve interchangeability.
5, a kind of differential pressure measurement circuit that is used for clean bench according to claim 1 and 2, it is characterized in that: described amplifying circuit is made up of amplifier IC4, resistance R 8, R9, R10, R11, adjustable resistance W1, wherein, the negative input of amplifier IC4 and connecting resistance R8 and R6, the output terminal of another termination amplifier IC4 of resistance R 8, the positive input of amplifier IC4 and connecting resistance R9 and R7, the adjustable side of another termination adjustable resistance W1 of resistance R 9, resistance R 10, adjustable resistance W1 and resistance R 11 are serially connected between power Vcc and the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520040408 CN2788162Y (en) | 2005-03-25 | 2005-03-25 | Differential pressure measuring circuit used to cleanse operating station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520040408 CN2788162Y (en) | 2005-03-25 | 2005-03-25 | Differential pressure measuring circuit used to cleanse operating station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2788162Y true CN2788162Y (en) | 2006-06-14 |
Family
ID=36786457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520040408 Expired - Lifetime CN2788162Y (en) | 2005-03-25 | 2005-03-25 | Differential pressure measuring circuit used to cleanse operating station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2788162Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103234689A (en) * | 2013-04-24 | 2013-08-07 | 武汉航空仪表有限责任公司 | Circuit of high-accuracy pressure transmitter |
-
2005
- 2005-03-25 CN CN 200520040408 patent/CN2788162Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103234689A (en) * | 2013-04-24 | 2013-08-07 | 武汉航空仪表有限责任公司 | Circuit of high-accuracy pressure transmitter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN2788162Y (en) | Differential pressure measuring circuit used to cleanse operating station | |
| CN200965642Y (en) | DC temperature control circuit | |
| CN104568207A (en) | Temperature signal acquiring device for vehicle radiator | |
| CN201983788U (en) | High-precision portable digital gradienter | |
| CN105043665B (en) | A kind of pressure detection system and its calibration method with automatic calibration function | |
| CN205038006U (en) | Pressure collecting circuit of constant current source driving pressure sensor | |
| CN209927672U (en) | Outdoor PM2.5 measuring device | |
| CN214273911U (en) | Medical vacuum negative pressure machine driving system | |
| CN204557241U (en) | A kind of digital pressure switch | |
| CN113790837A (en) | Novel pressure detection circuit of digital potentiometer | |
| CN201682460U (en) | Sensor signal amplification and conditioning circuit | |
| CN2788195Y (en) | Wind speed measuring and controlling circuit for purification of operating bench | |
| CN2458610Y (en) | Portable medical intelligent vacuum-meter check meter | |
| CN210833582U (en) | Step counting insole | |
| CN202748398U (en) | Voltage/current integrated transducer | |
| CN206573967U (en) | A kind of positive and negative adjustable D.C. regulated power supply | |
| CN202794317U (en) | Zero cross detection circuit structure | |
| CN208937636U (en) | A kind of current detection circuit of no amplifier | |
| CN205265930U (en) | High sensitivity electron temperature control system | |
| CN102314187A (en) | Direct-current voltage proportion output circuit and control method thereof | |
| CN201297934Y (en) | Intelligent transducer based on SPI protocol | |
| CN216621600U (en) | High-precision pressure sensor calibration circuit | |
| CN210323908U (en) | Low-impedance closed-loop temperature control circuit | |
| CN202350901U (en) | Signal transmitter for weighing sensor | |
| CN210323186U (en) | Current detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20150325 Granted publication date: 20060614 |