CN113503902A - High-precision sensor reliable access detection indicating circuit - Google Patents
High-precision sensor reliable access detection indicating circuit Download PDFInfo
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- CN113503902A CN113503902A CN202110518928.9A CN202110518928A CN113503902A CN 113503902 A CN113503902 A CN 113503902A CN 202110518928 A CN202110518928 A CN 202110518928A CN 113503902 A CN113503902 A CN 113503902A
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- G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
Abstract
The invention discloses a high-precision sensor reliable access detection indicating circuit, which relates to the field of sensor access detection and aims to realize a high-precision and high-compatibility sensor reliable access detection circuit, and comprises a detection module and an indicating module, wherein the detection module comprises an operational amplifier group, a passive sensor, a negative offset sensor detection module and a constant current source sensor detection module; the operational amplifier group comprises two operational amplifiers; the output ends of the passive sensor and the negative bias sensor detection module are connected to the input end of one operational amplifier, and the output end of the constant current source sensor detection module is connected to the input end of the other operational amplifier, so that the high-precision detection circuit capable of measuring the reliable access of various sensors is realized.
Description
Technical Field
The invention relates to the field of sensor access detection, in particular to a high-precision sensor reliable access detection indicating circuit.
Background
With the development of the technology, the collection demand of sensor data is very much, the application scenes of the sensors are very many, and the guarantee of the reliable access of the sensors is an important premise for realizing the scenes of the internet of things, automation and the like, so that the high-precision detection of the reliable access of the sensors becomes a problem to be solved.
In order to facilitate detection, it is important to design a reliable detection indication circuit with high precision and high detection compatibility for the sensor.
Disclosure of Invention
The invention discloses a high-precision sensor reliable access detection indicating circuit, and aims to realize a high-precision and high-compatibility sensor reliable access detection circuit.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a high accuracy sensor reliably inserts and detects indicating circuit, includes detection module and indicating module, and detection module includes operational amplifier group, passive sensor and negative bias sensor detection module and constant current source sensor detection module.
The operational amplifier group comprises two operational amplifiers; the output ends of the passive sensor and the negative bias sensor detection module are connected to the input end of one operational amplifier, and the output end of the constant current source sensor detection module is connected to the input end of the other operational amplifier.
Preferably, the operational amplifier group adopts a double operational amplifier module with the model number of LM258DR2G, the GND port of the LM258DR2G is grounded, the VCC port is connected with a 5V direct current source, the 1 IN-and 1IN + ports are connected with the output ends of the passive sensor and negative bias sensor detection module, and the 2 IN-and 2IN + ports are connected with the output end of the constant current sensor detection module.
Preferably, the passive sensor and negatively biased sensor detection module comprises 9 resistors.
The first resistor and the second resistor are connected IN series, a detection signal is input from the first resistor, the other end of the second resistor is connected to the 1IN + port of the LM258DR2G, one ends of the third resistor and the fourth resistor are respectively connected to a connecting wire between the first resistor and the second resistor, the other end of the third resistor is connected with a 5V direct current source, and the other end of the fourth resistor is grounded; the fifth resistor and the sixth resistor are connected IN series, the other end of the fifth resistor is connected with a 5V direct current source, and the other end of the sixth resistor is connected with a 1 IN-port of the LM258DR 2G; one end of the seventh resistor is connected to the common end between the fifth resistor and the sixth resistor, and the other end of the seventh resistor is grounded; one end of the eighth resistor is connected with the 1IN + port of the LM258DR2G, the other end of the eighth resistor is connected with one end of the ninth resistor, the one end of the ninth resistor is also connected with the 1OUT port of the LM258DR2G, and the other end of the ninth resistor is the output end of the passive sensor and the negative bias sensor detection module.
Preferably, the constant current source sensor detection module includes 6 resistors.
One end of a tenth resistor and one end of an eleventh resistor are connected to the 2 IN-port of the LM258DR2G IN common, the other end of the tenth resistor is connected with a 5V direct current source, and the other end of the eleventh resistor is grounded; a twelfth resistor and a thirteenth resistor are connected IN series, the common end of the twelfth resistor and the thirteenth resistor is connected to the 2OUT port of the LM258DR2G, the other end of the twelfth resistor is the output end of the constant current source sensor detection module, and the other end of the thirteenth resistor is connected to the 2IN + port of the LM258DR 2G; one end of a fourteenth resistor is connected to the 2IN + port of the LM258DR2G, and the other end of the fourteenth resistor is grounded; one end of the fifteenth resistor is connected to the 2IN + port of the LM258DR2G, and the other end of the fifteenth resistor is an input end of the detection signal.
The passive sensor, the negative bias sensor detection module and the constant current source sensor detection module are arranged, so that high compatibility is realized, and the access reliability of different types of sensors can be tested; the structure is simple, the access test is convenient, and the application to various different test scenes is convenient; the resistors in the detection module are set and judged according to the output level, so that high-precision detection is realized, and the measurement reliability is greatly improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view in example 1;
the resistor comprises R1, R2, a second resistor, R3, a third resistor, R4, a fourth resistor, R5, a fifth resistor, R6, a sixth resistor, R7, a seventh resistor, R8, an eighth resistor, R9, a ninth resistor, R10, a tenth resistor, R11, an eleventh resistor, R12, a twelfth resistor, R13, a thirteenth resistor, R14, a fourteenth resistor and R15, the fifteenth resistor.
Detailed Description
The invention discloses a high-precision sensor reliable access detection indicating circuit, which comprises a detection module and an indicating module, wherein the detection module comprises an operational amplifier group, a passive sensor, a negative bias sensor detection module and a constant current source sensor detection module, as shown in figure 1. The operational amplifier group comprises two operational amplifiers; the output ends of the passive sensor and the negative bias sensor detection module are connected to the input end of one operational amplifier, and the output end of the constant current source sensor detection module is connected to the input end of the other operational amplifier.
The passive sensor and negative bias sensor detection module is used for detecting the access reliability of the passive sensor and the negative bias sensor, the constant current source sensor detection module is used for detecting the access reliability of the constant current source sensor, and the operational amplifier group is used for processing detected result signals.
The main principle of the passive sensor and negative bias sensor detection module is that sensor detection is realized by changing access impedance, the constant current source sensor detection module realizes detection through a resistance voltage division comparator, and finally, a detection result is displayed and indicated through an indication module.
Example 1
The embodiment is based on the basic structure that the high-precision sensor is reliably connected into the detection indicating circuit.
IN this embodiment, the operational amplifier group uses a dual operational amplifier module with model number LM258DR2G, the GND port of LM258DR2G is grounded, the VCC port is connected to a 5V dc source, the 1 IN-and 1IN + ports are connected to the output terminals of the passive sensor and negative offset sensor detection module, and the 2 IN-and 2IN + ports are connected to the output terminal of the constant current source sensor detection module.
Referring to fig. 2, the passive sensor and negatively biased sensor detection module includes 9 resistors. The detection circuit comprises a first resistor R1, a second resistor R2, a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4, wherein the first resistor R1 and the second resistor R2 are connected IN series, a detection signal is input from the first resistor R1, the other end of the second resistor R2 is connected to a 1IN + port of the LM258DR2G, one ends of the third resistor R3 and the fourth resistor R4 are respectively connected to a connecting line between the first resistor R1 and the second resistor, the other end of the third resistor R3 is connected with a 5V direct current source, and the other end of the fourth resistor R4 is grounded; the fifth resistor R5 and the sixth resistor R6 are connected IN series, the other end of the fifth resistor R5 is connected with a 5V direct current source, and the other end of the sixth resistor R6 is connected with the 1 IN-port of the LM258DR 2G; one end of the seventh resistor R7 is connected to the common end between the fifth resistor R5 and the sixth resistor R6, and the other end of the seventh resistor R7 is grounded; one end of the eighth resistor R8 is connected to the 1IN + port of the LM258DR2G, the other end of the eighth resistor R8 is connected to one end of the ninth resistor R9, the one end of the ninth resistor R9 is also connected to the 1OUT port of the LM258DR2G, and the other end of the ninth resistor R9 is the output end of the passive sensor and the negative bias sensor detection module.
Preferably, the resistance values of the first resistor R1 and the ninth resistor R9 are 1 kiloohm; the resistance values of the second resistor R2 and the sixth resistor R6 are 10 kilo-ohms; the fourth resistor R4 and the seventh resistor R7 have the resistance value of 1.2 megaohms; the resistance of the third resistor R3 is 100 kilo-ohms; the fifth resistor R5 is 200 kilo-ohms; the eighth resistor R8 is a zero ohm resistor.
According to the basic principle of the circuit, IN the normal case, the input voltage of the 1IN + port is:
1.2MΩ/(100K+1.2MΩ)*5V＝4.615V；
while the voltage at the 1 IN-port is:
1.2MΩ/(200K+1.2MΩ)*5V＝4.285V；
at this time, the operational amplifier acts as a comparator, so that the 1OUT output of LM258DR2G is 5V, i.e., when the passive sensor and the negatively biased sensor detection block are in the sensor non-connected state, the 1OUT output of LM258DR2G is 5V.
When the passive sensor is connected, since the impedance of the passive sensor is approximately 700 ohms, the input voltage of the 1IN + port at this time is:
1.7K/(100K+1.7K)*5V＝0.0167V；
the voltage at the 1 IN-port is:
1.2MΩ/(200K+1.2MΩ)*5V＝4.285V；
at this time, the operational amplifier is connected into a comparator, so that the 1OUT output of the current operational amplifier is 0V, and the current operational amplifier is in a sensor access state. Namely, when the passive sensor is reliably connected, the output voltage of 1OUT is 0V.
When the negative bias sensor is switched on, since the voltage of the negative bias sensor is about-10 to-12V, the input voltage of the 1IN + port should be negative at this time, but due to the characteristics of the operational amplifier, and the current limit of the second resistor R2, the input signal of the 1IN + port is actually 0, and the voltage of the 1 IN-port is:
1.2MΩ/(200K+1.2MΩ)*5V＝4.285V；
at this time, the operational amplifier acts as a comparator, and thus the 1OUT output is 0V. I.e., reliable connection to the negative bias sensor, the output voltage of 1OUT is 0V.
In summary, whether the passive sensor or the negative bias sensor is reliably accessed can be judged according to the output voltage value of the 1OUT port.
Example 3
The present embodiment explains the constant current source sensor detection module based on the embodiment in which the constant current source sensor detection module includes 6 resistors.
Referring to fig. 2, one end of the tenth resistor R10 and one end of the eleventh resistor R11 are commonly connected to the 2 IN-port of the LM258DR2G, the other end of the tenth resistor R10 is connected to the 5V dc source, and the other end of the eleventh resistor R11 is grounded; the twelfth resistor R12 and the thirteenth resistor R13 are connected IN series, the common end of the twelfth resistor R12 and the thirteenth resistor R13 is connected to the 2OUT port of the LM258DR2G, the other end of the twelfth resistor R12 is the output end of the constant current source sensor detection module, and the other end of the thirteenth resistor R13 is connected to the 2IN + port of the LM258DR 2G; one end of a fourteenth resistor R14 is connected to the 2IN + port of LM258DR2G, and the other end of the fourteenth resistor R14 is grounded; one end of the fifteenth resistor R15 is connected to the 2IN + port of the LM258DR2G, and the other end of the fifteenth resistor R15 is an input end of the detection signal.
Preferably, the resistance values of the tenth resistor R10 and the eleventh resistor R11 are 10 kilo-ohms; the resistance of the twelfth resistor R12 is 1 kiloohm; the thirteenth resistor R13 adopts a zero ohm resistor; the resistance of the fourteenth resistor R14 is 200 kilo-ohms; the fifteenth resistor R15 has a resistance of 1 mega ohm.
IN the normally disengaged case, the input voltage of 1IN + is:
200K/(1MΩ+200K)*24V＝4V
the voltage at the 1 IN-port is:
10KΩ/(20K)*5V＝2.5V
the operational amplifier is equivalent to a comparator, so that the 2OUT output voltage is 5V. That is, in the sensor-unaccessed state, the output voltage of 2OUT is 5V.
When the constant current source sensor is reliably connected, the input voltage of 1IN + is:
200KΩ/(1MΩ+200KΩ)*12V＝2V
the voltage at the 1 IN-port is:
10KΩ/(20K)*5V＝2.5V；
the operational amplifier corresponds to a comparator, and thus the 2OUT output is 0V. Namely, when the constant current source sensor detection module is connected with the constant current source sensor, the output voltage of the 2OUT port is 0V.
In summary, whether the constant current source sensor is reliably connected can be judged according to the output voltage value of the 2OUT port.
Specifically, the circuit can detect any sensor access with positive bias by adjusting the ratio of the resistors.
Claims (4)
1. The utility model provides a high accuracy sensor reliably inserts and detects indicating circuit, includes detection module and indicating module, its characterized in that: the detection module comprises an operational amplifier group, a passive sensor, a negative bias sensor detection module and a constant current source sensor detection module;
the operational amplifier group comprises two operational amplifiers; the output ends of the passive sensor and the negative bias sensor detection module are connected to the input end of one operational amplifier, and the output end of the constant current source sensor detection module is connected to the input end of the other operational amplifier.
2. The high precision sensor reliable access detection indicating circuit of claim 1, wherein: the operational amplifier group adopts a double operational amplifier module with the model number of LM258DR2G, the GND port of the LM258DR2G is grounded, the VCC port is connected with a 5V direct current source, the 1 IN-and 1IN + ports are connected with the output ends of the passive sensor and the negative bias sensor detection module, and the 2 IN-and 2IN + ports are connected with the output end of the constant current sensor detection module.
3. A high accuracy sensor reliable access detection indication circuit as in claim 2, wherein: the passive sensor and negative bias sensor detection module comprises 9 resistors;
the first resistor R1 and the second resistor R2 are connected IN series, a detection signal is input from the first resistor R1, the other end of the second resistor R2 is connected to the 1IN + port of the LM258DR2G, one ends of the third resistor R3 and the fourth resistor R4 are respectively connected to a connecting line between the first resistor R1 and the second resistor, the other end of the third resistor R3 is connected with a 5V direct current source, and the other end of the fourth resistor R4 is grounded; the fifth resistor R5 and the sixth resistor R6 are connected IN series, the other end of the fifth resistor R5 is connected with a 5V direct current source, and the other end of the sixth resistor R6 is connected with the 1 IN-port of the LM258DR 2G; one end of the seventh resistor R7 is connected to the common end between the fifth resistor R5 and the sixth resistor R6, and the other end of the seventh resistor R7 is grounded; one end of an eighth resistor R8 is connected to the 1IN + port of the LM258DR2G, the other end of the eighth resistor R8 is connected to one end of a ninth resistor R9, the one end of the ninth resistor R9 is also connected to the 1OUT port of the LM258DR2G, and the other end of the ninth resistor R9 is the output end of the passive sensor and the negative bias sensor detection module.
4. A high accuracy sensor reliable access detection indication circuit as in claim 2, wherein: the constant current source sensor detection module comprises 6 resistors;
one end of a tenth resistor R10 and one end of an eleventh resistor R11 are commonly connected to the 2 IN-port of the LM258DR2G, the other end of the tenth resistor R10 is connected with a 5V direct current source, and the other end of the eleventh resistor R11 is grounded; a twelfth resistor R12 and a thirteenth resistor R13 are connected IN series, the common end of the twelfth resistor R12 and the thirteenth resistor R13 is connected to the 2OUT port of the LM258DR2G, the other end of the twelfth resistor R12 is the output end of the constant current source sensor detection module, and the other end of the thirteenth resistor R13 is connected to the 2IN + port of the LM258DR 2G; one end of a fourteenth resistor R14 is connected to the 2IN + port of the LM258DR2G, and the other end of the fourteenth resistor R14 is grounded; one end of a fifteenth resistor R15 is connected to the 2IN + port of the LM258DR2G, and the other end of the fifteenth resistor R15 is an input end of the detection signal.
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| CN202110518928.9A CN113503902A (en) | 2021-05-12 | 2021-05-12 | High-precision sensor reliable access detection indicating circuit |
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| KR20000031731A (en) * | 1998-11-07 | 2000-06-05 | 윤종용 | Circuit for controlling built in earphone-microphoneconnection in mobile communication terminal |
| US20050283330A1 (en) * | 2004-06-16 | 2005-12-22 | Laraia Jose M | Reactive sensor modules using pade' approximant based compensation and providing module-sourced excitation |
| KR20130123671A (en) * | 2012-05-03 | 2013-11-13 | 삼성전자주식회사 | Apparatus and method for preventing error recognition in earjack |
| CN207623443U (en) * | 2018-01-03 | 2018-07-17 | 杭州腾振科技有限公司 | A kind of ICP sensor states detection circuit |
| CN111323652A (en) * | 2020-03-12 | 2020-06-23 | 深圳芯启航科技有限公司 | Self-mutual capacitance detection circuit, method, chip and equipment |
| CN211790841U (en) * | 2020-03-21 | 2020-10-27 | 守恒新能源(重庆)有限公司 | Distributor circuit, distributor and series battery pack |
-
2021
- 2021-05-12 CN CN202110518928.9A patent/CN113503902A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR840001619Y1 (en) * | 1983-02-10 | 1984-08-30 | 삼성전자공업주식회사 | Temperature probe jack sensing circuit of electronic range |
| KR20000031731A (en) * | 1998-11-07 | 2000-06-05 | 윤종용 | Circuit for controlling built in earphone-microphoneconnection in mobile communication terminal |
| US20050283330A1 (en) * | 2004-06-16 | 2005-12-22 | Laraia Jose M | Reactive sensor modules using pade' approximant based compensation and providing module-sourced excitation |
| KR20130123671A (en) * | 2012-05-03 | 2013-11-13 | 삼성전자주식회사 | Apparatus and method for preventing error recognition in earjack |
| CN207623443U (en) * | 2018-01-03 | 2018-07-17 | 杭州腾振科技有限公司 | A kind of ICP sensor states detection circuit |
| CN111323652A (en) * | 2020-03-12 | 2020-06-23 | 深圳芯启航科技有限公司 | Self-mutual capacitance detection circuit, method, chip and equipment |
| CN211790841U (en) * | 2020-03-21 | 2020-10-27 | 守恒新能源(重庆)有限公司 | Distributor circuit, distributor and series battery pack |
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