CN103234695A - Detection verifying circuit and detection verifying method of pressure transmitter - Google Patents
Detection verifying circuit and detection verifying method of pressure transmitter Download PDFInfo
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- CN103234695A CN103234695A CN2013101447978A CN201310144797A CN103234695A CN 103234695 A CN103234695 A CN 103234695A CN 2013101447978 A CN2013101447978 A CN 2013101447978A CN 201310144797 A CN201310144797 A CN 201310144797A CN 103234695 A CN103234695 A CN 103234695A
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Abstract
The invention belongs to the pressure sensing technology and relates to a detection verifying method of a pressure transmitter. A circuit of the pressure transmitter consists of a constant flow source, a piezoresistive pressure sensing device, a signal conditioning amplifying circuit, an output checking resistance network, a synchronous switching switch and a temperature compensating and regulating resistor. The output checking resistance network is built in the transmitter, and the effect equivalent to the input of different pressure values is realized through switching different verifying resistances. The method is characterized in that the detection verification of the pressure transmitter does not need the pressure source, the detection and the verification of the pressure transmitter can be realized under the condition that the use site of the pressure transmitter does not have the precise pressure source or cannot provide the precise pressure source, and convenience and high speed are realized. The circuit and the method are particularly suitable for domain outfield detection, reviewing and maintenance troubleshooting.
Description
Technical field
The invention belongs to pressure sensing technology, relate to detection checking circuit and the examinaing method of a kind of pressure unit under no pressure source condition.
Background technology
A large amount of pressure units or pressure unit in various equipments, have been used.The verification of pressure unit or pressure unit, detection are maintenance and the safeguard work of a routine, to guarantee that product is working properly, performance is qualified.The verification of pressure unit generally all needs precision pressure source or pressure controller equipment, and these equipment especially pressure controller of gas medium compare costliness usually, and bulky, environment for use requires harsh, complex operation, efficient is lower, and the environmental baseline in outfield is difficult to meet the demands.
Summary of the invention
The objective of the invention is: a kind of detection check circuit and method thereof of pressure unit are provided, are need not to finish verification, testing at any time quickly and easily under the pressure source condition.
Technical scheme of the present invention is: a kind of detection check circuit of pressure unit comprises constant current source (1), pressure resistance type pressure-sensitive component (2), signal condition amplifying circuit (6), temperature compensation and output adjusting resistance R p1 and Rp2, output verification resistor network (4), synchronous change-over switch (3); This steps on the quick electric bridge of four arm strengths to pressure resistance type pressure-sensitive component (2) for favour, has 5 nodes, and wherein node e is positive power source terminal, and node b is negative power end, is connected with flowing into to hold with the outflow end of constant current source (1) respectively; Node a, c are respectively positive and negative output terminal, are connected with the positive and negative input end of signal condition amplifying circuit respectively; Node d serial connection output verification resistor network (4) links to each other with constant current source (1) positive power source terminal; Output verification resistor network (4) comprises zero-bit output voltage adjusting resistance R p3-1 and preset resistance Rp3-n, and Rp3-1 and Rp3-n are selectable by between synchronous change-over switch (3) access node d and constant current source (1) positive power source terminal; Resistance R p2 is connected in parallel between pressure resistance type SOI pressure-sensitive component (2) positive power source terminal and the positive output end; Adjustable resistance Rp1 is connected in parallel between the positive and negative power end of pressure resistance type SOI pressure-sensitive component (2).
Principle of the present invention: the purpose of pressure unit detection check is whether the detection performance is normal, and whether output voltage satisfies error requirements, and whether each ingredient that comes down to the verification pressure unit is working properly.The circuit theory of pressure-sensitive component is equivalent to a Hui Sideng four arm electrical bridge; Wheatstone bridge is worked under the constant current source condition, and when the pressure unit input pressure, the resistance value of electric bridge brachium pontis changes, and the output magnitude of voltage corresponding with force value; The pressure-sensitive component output valve changes and amplifies in signal conditioning circuit and temperature compensation.The present invention namely utilizes the variation of arm resistance and the corresponding relation of pressure, seals in preset resistance by the some brachium pontis at four arm electrical bridge, the simulated pressure input value.The resistance that presets is corresponding one by one with force value, can judge whether the output voltage values of each pressure detection point downforce transmitter satisfies error requirements by switching different resistances.
A kind of detection check method of pressure unit may further comprise the steps:
Step 1: finish output adjustment and the temperature compensation of pressure unit by output adjusting resistance R p2 and thermo-compensator Rp1;
Step 2: near zero-bit is regulated resistance, be arranged in parallel verification and adjust resistance, the output voltage of the resistance detected pressures transmitter by regulating resistance, this output voltage is corresponding with the pressure working point of check, detection;
Step 3: resistance is adjusted in the verification of listing be replaced by accurate fixed resistance; Under the condition of pressure unit zero pressure input, check the pressure unit output voltage by synchronous change-over switch;
Step 5:Rp3-1 is connected in the pressure transmitter circuit by change-over switch, and Rp3-2～Rp3-n is not connected in the circuit; The pressure unit operate as normal;
Step 4: as needs pressure unit is carried out detection check, finish being electrically connected of pressure unit;
At first, whether detected pressures transmitter zero-bit output voltage is normal;
Then, by change-over switch, successively with in Rp3-2～Rp3-n cut-in pressure transmitter circuit, and whether the output voltage of detected pressures transmitter meets the demands; Output voltage as pressure unit satisfies table 3 and error requirements, can judge that pressure unit is working properly;
Step 5: after detection check is finished, synchronous change-over switch is switched to Rp3-1, pressure unit recovers normal mode of operation.
Advantage and beneficial effect that the present invention has are: the present invention only needs power supply, voltage table and stube cable, and do not need complexity, expensive pressure control equipment, can realize detection, the verification work of pressure unit, be particularly suitable for the verification of military equipment outfield pressure unit, convenient, fast, practical.
This method checks the output voltage of pressure unit correspondence by switching different verification resistance, can judge whether pressure unit is working properly, and whether output accuracy meets the demands.
Description of drawings
Fig. 1 is circuit diagram of the present invention.
Embodiment
Below in conjunction with Figure of description the present invention is described in further detail.
A kind of detection check circuit of pressure unit comprises constant current source 1, pressure resistance type pressure-sensitive component 2, signal condition amplifying circuit 6, temperature compensation and output adjusting resistance R p1 and Rp2, output verification resistor network 4, synchronous change-over switch 3; This steps on the quick electric bridge of four arm strengths to pressure resistance type pressure-sensitive component 2 for favour, has 5 nodes, and wherein node e is positive power source terminal, and node b is negative power end, is connected with flowing into to hold with the outflow end of constant current source 1 respectively; Node a, c are respectively positive and negative output terminal, are connected with the positive and negative input end of signal condition amplifying circuit respectively; Node d serial connection output verification resistor network 4 links to each other with constant current source 1 positive power source terminal; Output verification resistor network 4 comprises zero-bit output voltage adjusting resistance R p3-1 and preset resistance Rp3-n, and Rp3-1 and Rp3-n are selectable by between synchronous change-over switch 3 access node d and constant current source 1 positive power source terminal; Resistance R p2 is connected in parallel between pressure resistance type SOI pressure-sensitive component 2 positive power source terminals and the positive output end; Adjustable resistance Rp1 is connected in parallel between the pressure resistance type SOI pressure-sensitive component 2 positive and negative power ends.
Resistance R p3-1 is that in the output verification resistor network 4 regulates resistance, as regulating pressure unit zero-bit output voltage, resistance R p3-1 is connected with pressure resistance type SOI pressure-sensitive component 2 node d by synchronous change-over switch 3 one ends, and the other end is connected with the outflow end of constant current source 1; Signal condition amplifying circuit 6 amplifies the output signal of pressure resistance type pressure-sensitive component 2 and exports; Output verification resistor network 4 is regulated the resistance R p3-1 except comprising the zero-bit output voltage, has also comprised several preset resistance Rp3-2, Rp3-3 ... Rp3-n, its resistance quantity detects needs according to verification and determines.
When the pressure unit operate as normal, resistance R p3-1 is connected with pressure resistance type SOI pressure-sensitive component 2 node d by synchronous change-over switch 3 one ends as zero-bit output adjusting resistance in the verification resistor network 4, and the other end is connected with the outflow end of constant current source 1; When needs during in the output of no pressure source condition verification pressure unit, by resistance (Rp3-2, the Rp3-3 in the change-over switch 3 selection check resistor network successively ... Rp3-n), the different different output voltage of verification resistance corresponding pressure transmitter; And output voltage is corresponding with the input pressure value.Therefore, by selecting different verification resistance can simulate different pressure input values.When switching verification resistance (Rp3-1, Rp3-2, Rp3-3 ... Rp3-n), judge whether the output signal of pressure unit is normal, can confirm whether pressure unit exists fault, thereby realize the purpose of pressure unit verification.
Embodiment:
Be described in further detail below in conjunction with the present invention of embodiment, a kind of detection check method of pressure unit may further comprise the steps:
Step 1: finish output adjustment and the temperature compensation of pressure unit by normal temperature output adjusting resistor network and thermo-compensator network.
It is the pressure-sensitive component of (0～35) MPa that this example is selected pressure measurement range for use; The corresponding output voltage values of the pressure unit that debugging is finished is (100～5000) mV, and output characteristics is linear.The pressure detection point is respectively (0,7,14,21,28,35) MPa, and preset resistance is 5, is respectively Rp3-2～Rp3-5; Its corresponding output voltage and normal temperature error see Table 1.
The pressure detection point of table 1 pressure unit and output voltage corresponding tables
By the pressure unit debugging, can determine Rp3-1=10 Ω.
Step 2: near zero-bit is regulated resistance, be arranged in parallel verification and adjust resistance, the output voltage of the resistance detected pressures transmitter by regulating resistance, this output voltage is corresponding with the pressure working point of check, detection.
The verification adjustment resistance of pressure unit and the corresponding relation of output voltage are as shown in table 2.
Resistance and output voltage corresponding tables are adjusted in the verification of table 2 pressure unit
Step 3: the verification adjustment resistance that table 2 is listed is replaced by accurate fixed resistance; Under the condition of pressure unit zero pressure input, check the pressure unit output voltage by synchronous change-over switch.
Resistance and output voltage corresponding tables are adjusted in the verification of table 3 pressure unit
Step 4: in use, Rp3-1 is connected in the pressure transmitter circuit by change-over switch, and Rp3-2～Rp3-6 is not connected in the circuit; The pressure unit operate as normal.
Step 5: as needs pressure unit is carried out detection check, finish being electrically connected of pressure unit.At first, whether detected pressures transmitter zero-bit output voltage is normal; Then, by change-over switch, successively with in Rp3-2～Rp3-6 cut-in pressure transmitter circuit, and whether the output voltage of detected pressures transmitter meets the demands; Output voltage as pressure unit satisfies table 3 and error requirements, can judge that pressure unit is working properly.
Step 6: after detection check is finished, synchronous change-over switch is switched to Rp3-1, pressure unit recovers normal mode of operation.
Claims (2)
1. the detection check circuit of a pressure unit is characterized in that: comprise constant current source (1), pressure resistance type pressure-sensitive component (2), signal condition amplifying circuit (6), temperature compensation and output adjusting resistance R p1 and Rp2, output verification resistor network (4), synchronous change-over switch (3); This steps on the quick electric bridge of four arm strengths to pressure resistance type pressure-sensitive component (2) for favour, has 5 nodes, and wherein node e is positive power source terminal, and node b is negative power end, is connected with flowing into to hold with the outflow end of constant current source (1) respectively; Node a, c are respectively positive and negative output terminal, are connected with the positive and negative input end of signal condition amplifying circuit respectively; Node d serial connection output verification resistor network (4) links to each other with constant current source (1) positive power source terminal; Output verification resistor network (4) comprises zero-bit output voltage adjusting resistance R p3-1 and preset resistance Rp3-n, and Rp3-1 and Rp3-n are selectable by between synchronous change-over switch (3) access node d and constant current source (1) positive power source terminal; Resistance R p2 is connected in parallel between pressure resistance type SOI pressure-sensitive component (2) positive power source terminal and the positive output end; Adjustable resistance Rp1 is connected in parallel between the positive and negative power end of pressure resistance type SOI pressure-sensitive component (2).
2. the detection check method of a pressure unit is characterized in that, may further comprise the steps:
Step 1: finish output adjustment and the temperature compensation of pressure unit by output adjusting resistance R p2 and thermo-compensator Rp1;
Step 2: near zero-bit is regulated resistance, be arranged in parallel verification and adjust resistance, the output voltage of the resistance detected pressures transmitter by regulating resistance, this output voltage is corresponding with the pressure working point of check, detection;
Step 3: resistance is adjusted in the verification of listing be replaced by accurate fixed resistance; Under the condition of pressure unit zero pressure input, check the pressure unit output voltage by synchronous change-over switch;
Step 5:Rp3-1 is connected in the pressure transmitter circuit by change-over switch, and Rp3-2～Rp3-n is not connected in the circuit; The pressure unit operate as normal;
Step 4: as needs pressure unit is carried out detection check, finish being electrically connected of pressure unit;
At first, whether detected pressures transmitter zero-bit output voltage is normal;
Then, by change-over switch, successively with in Rp3-2～Rp3-n cut-in pressure transmitter circuit, and whether the output voltage of detected pressures transmitter meets the demands; Output voltage as pressure unit satisfies table 3 and error requirements, can judge that pressure unit is working properly;
Step 5: after detection check is finished, synchronous change-over switch is switched to Rp3-1, pressure unit recovers normal mode of operation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310144797.8A CN103234695B (en) | 2013-04-24 | 2013-04-24 | A kind of detection check circuit of pressure unit and method thereof |
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| CN201310144797.8A CN103234695B (en) | 2013-04-24 | 2013-04-24 | A kind of detection check circuit of pressure unit and method thereof |
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| CN103234695B CN103234695B (en) | 2015-09-02 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716952A (en) * | 2013-12-16 | 2015-06-17 | 中核兰州铀浓缩有限公司 | External equivalent device used after electric bridge of countercurrent sensor breaks and equivalent regeneration method |
| CN107702837A (en) * | 2016-08-08 | 2018-02-16 | 霍尼韦尔国际公司 | Pressure sensor offset temperature coefficient adjusts |
| CN107907269A (en) * | 2017-09-28 | 2018-04-13 | 芯海科技（深圳）股份有限公司 | A kind of resistance bridge sensor diagnostics circuit |
| CN108254279A (en) * | 2017-12-04 | 2018-07-06 | 中国飞机强度研究所 | The adjustable shunting calibration equipment of one kind |
| CN108956005A (en) * | 2018-08-08 | 2018-12-07 | 陈德连 | pressure sensor |
| CN112284613A (en) * | 2020-10-27 | 2021-01-29 | 深圳市鑫精诚科技有限公司 | Calibration method of force sensor |
| CN113865757A (en) * | 2021-09-16 | 2021-12-31 | 歌尔微电子股份有限公司 | Detection circuit and detection method of piezoresistive pressure sensor and electronic equipment |
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| US4213348A (en) * | 1979-08-01 | 1980-07-22 | Medasonics, Inc. | Self-calibrating automatic zeroing strain gauge circuit |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104716952A (en) * | 2013-12-16 | 2015-06-17 | 中核兰州铀浓缩有限公司 | External equivalent device used after electric bridge of countercurrent sensor breaks and equivalent regeneration method |
| CN104716952B (en) * | 2013-12-16 | 2018-07-06 | 中核兰州铀浓缩有限公司 | External equivalent device and equivalent regeneration method after the fracture of backflow sensor electric bridge |
| CN107702837A (en) * | 2016-08-08 | 2018-02-16 | 霍尼韦尔国际公司 | Pressure sensor offset temperature coefficient adjusts |
| CN107702837B (en) * | 2016-08-08 | 2022-01-04 | 霍尼韦尔国际公司 | Offset temperature coefficient adjustment for pressure sensor |
| CN107907269A (en) * | 2017-09-28 | 2018-04-13 | 芯海科技（深圳）股份有限公司 | A kind of resistance bridge sensor diagnostics circuit |
| CN108254279A (en) * | 2017-12-04 | 2018-07-06 | 中国飞机强度研究所 | The adjustable shunting calibration equipment of one kind |
| CN108956005A (en) * | 2018-08-08 | 2018-12-07 | 陈德连 | pressure sensor |
| CN108956005B (en) * | 2018-08-08 | 2024-03-22 | 陈德连 | Pressure sensor |
| CN112284613A (en) * | 2020-10-27 | 2021-01-29 | 深圳市鑫精诚科技有限公司 | Calibration method of force sensor |
| CN113865757A (en) * | 2021-09-16 | 2021-12-31 | 歌尔微电子股份有限公司 | Detection circuit and detection method of piezoresistive pressure sensor and electronic equipment |
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| CN103234695B (en) | 2015-09-02 |
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