CN114593842A - Multi-channel thermistor detection system and detection method - Google Patents
Multi-channel thermistor detection system and detection method Download PDFInfo
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Abstract
The application relates to a multi-channel thermistor detection system and a detection method. The system comprises: the device comprises a multi-path resistance value acquisition module, a water boiling experiment module, a mode switching module, an abnormality indication module and a control module; the output end of the multi-path resistance value acquisition module is connected with the input end of the control module, and is provided with a plurality of ports connected with the thermistor to be detected and the standard thermistor and used for acquiring the resistance value of the resistor; the output end of the abnormality indication module is connected with the input end of the control module, so that the control module controls the abnormality indication module to output abnormality prompt information according to the resistance value test result; the output end of the boiling experiment module is connected with the input end of the control module, and the output end of the control module is connected with the input end of the mode switching module, so that the control module controls the mode switching module to execute mode switching actions according to the heating state data of the boiling experiment module. The scheme provided by the application can realize the synchronous acquisition and detection of the multi-channel thermistor to be detected.
Description
Technical Field
The application relates to the technical field of thermistors, in particular to a multi-path thermistor detection system and a multi-path thermistor detection method.
Background
A thermistor is a heat-sensitive element made by utilizing the characteristic that the resistance of a semiconductor significantly changes with temperature. The device has the characteristics of sensitivity to heat, large resistivity, small volume, small thermal inertia and the like, and is an important device for measuring and controlling temperature. Therefore, the method is widely applied to experimental application, industrial application and the like.
In the production process of the manufacturing industry, a thermistor is often required to be arranged inside a manufactured product, so that the raw material quality and incoming material detection of the thermistor becomes an important link in the manufacturing process and is also a key difficult problem of the manufacturing industry. In order to ensure the quality to be qualified, when the quality test is carried out, after the water boiling aging experiment is carried out on the thermistor, the resistance value of the thermistor is detected and compared with the normal index, so that the resistance value is ensured to be within the qualified index.
In the related technology, generally, a boiling device is used for uniformly boiling thermistors to be tested for 1000 hours, then a universal meter is used for respectively testing the resistance value of each boiled thermistor to be tested, the testing time reaches 96 hours, and in the process, a tester is required to monitor resistance value testing data at all times, so that the labor is consumed;
if the resistance value of a plurality of thermistors to be tested needs to be tested simultaneously, in order to ensure that the resistance value test data can be matched with the thermistors one by one, each thermistor to be tested needs to be marked respectively, and the number of the thermistors to be tested, which can be monitored simultaneously by one tester, is limited, so that the thermistors cannot be tested in large batch, and the detection efficiency of the thermistors is low.
Disclosure of Invention
In order to overcome the problems in the related art, the application provides a multi-path thermistor detection system and a detection method, which can realize synchronous acquisition and detection of multi-path thermistors to be detected.
The present application provides in a first aspect a multi-channel thermistor detection system, comprising: the device comprises a multi-path resistance value acquisition module, a water boiling experiment module, a mode switching module, an abnormality indication module and a control module;
the output end of the multi-path resistance value acquisition module is connected with the input end of the control module, is provided with a plurality of ports connected with the thermistor to be tested and the standard thermistor, and is used for acquiring the resistance value of the resistor and transmitting the resistance value to the control module for comparison to obtain a resistance value test result;
the output end of the abnormality indication module is connected with the input end of the control module, so that the control module controls the abnormality indication module to output abnormality prompt information according to the resistance value test result;
the output end of the boiling experiment module is connected with the input end of the control module, and the output end of the control module is connected with the input end of the mode switching module, so that the control module controls the mode switching module to execute mode switching actions according to heating state data output by the boiling experiment module, and the multi-path thermistor to be tested is switched from a boiling state to a resistance value testing state.
In one embodiment, the control module includes: a PIC single chip microcomputer;
the PIC singlechip is provided with N A/D conversion ports, wherein N is an integer greater than 2; the A/D conversion port is connected with the multi-path resistance value acquisition module, so that the A/D conversion port is divided into M paths by the multi-path resistance value acquisition module to carry out M-1 paths of resistance value acquisition of the thermistor to be tested and 1 path of resistance value acquisition of the quasi thermistor, and M is an integer greater than 2;
and the input end and the output end of the PIC singlechip are respectively connected with the water boiling experiment module and the mode switching module.
In one embodiment, the multi-way resistance value acquisition module includes: n multiplexing chips; the multiplexing chip at least has M input ends;
the output end of the multiplexing chip is connected with an A/D conversion port of the PIC singlechip, so that the PIC singlechip can acquire at least M multiplied by N resistance values of the thermistor, wherein N multiplied by (M-1) resistance values are resistance values of the thermistor to be detected, and N resistance values are resistance values of the standard thermistor.
In one embodiment, the mode switching module includes: k IC chips, K × P relays, and 2 × (K × P) test resistances; k is an integer greater than 2, and P is an integer greater than 2;
the IC chip is provided with at least P output ends, wherein the output ends of the IC chip are connected with a relay, so that the IC chip controls the relay to be switched from a normally open state to a normally closed state under the control of the control module;
the relay is connected with the two test resistors and is provided with two normally open pins, two normally closed pins and two common points; one end of the test resistor is connected with a normally closed pin of the relay, and the other end of the test resistor is grounded; a normally open pin of the relay is grounded; one end of the thermistor to be tested is connected with the common point of the relay, and the other end of the thermistor to be tested is connected with the test power supply, so that when the relay is in a normally open state, the normally open pin is conducted with the common point, and the test power supply is directly grounded through the thermistor to be tested; when the relay is in a normally closed state, the normally closed pin is conducted with the common point, the thermistor to be tested and the test resistor divide the test voltage, and the multi-path resistance value acquisition module acquires the divided voltage of the thermistor to be tested.
In one embodiment, the poaching experiment module comprises: a water boiling device, a temperature sensor and a timer;
the temperature sensor is arranged on the water boiling device, and the output end of the temperature sensor is connected with the input end of the control module and used for detecting the water boiling temperature of the water boiling device in real time and sending the water boiling temperature to the control module;
the output end of the control module is connected with the input end of the timer, so that the control module controls the timer to be started when the boiling temperature reaches 100 ℃, and controls the mode switching module to execute the mode switching action when the timer times to reach the preset boiling time.
In one embodiment, the anomaly indication module includes: n (M-1) LED indicator lamps;
the N (M-1) LED indicator lamps correspond to the thermistors to be tested on the N (M-1) paths one by one, and the input ends of the LED indicator lamps are connected with the output end of the control module, so that the LED indicator lamps are turned on or off under the control of the control module.
In one embodiment, the anomaly indication module includes: an interactive screen;
the interactive screen is connected with the control module and used for receiving and displaying the resistance values of the multiple paths of thermistors to be tested in real time through the control module and receiving and displaying the abnormal prompt information sent by the control module.
The second aspect of the present application provides a multi-channel thermistor detection method, which is implemented based on any one of the multi-channel thermistor detection systems described above, and includes:
acquiring heating state data of the water boiling heating module; the heating state data includes: heating in boiling water for a long time;
judging whether the heating state data meet a water boiling completion condition or not, wherein the water boiling completion condition comprises the following steps: the boiling water heating time is more than or equal to the preset boiling time;
if so, controlling the mode switching module to execute the mode switching action, acquiring the resistance values of the multi-path thermistor to be tested and the standard thermistor which are acquired by the multi-path resistance value acquisition module, and comparing the resistance values of the multi-path thermistor to be tested with the resistance value of the standard thermistor respectively to obtain abnormal prompt information of each thermistor to be tested;
the method for obtaining the abnormal prompt information of the thermistor to be tested by comparing the resistance value of the thermistor to be tested with the resistance value of the standard thermistor comprises the following steps: comparing the resistance value of the current thermistor to be tested with the resistance value of the standard thermistor to obtain a resistance value test result; generating an abnormal indication instruction corresponding to the current thermistor to be tested based on a resistance value test result of the current thermistor to be tested; and controlling an abnormality indication module to output the abnormality prompt information of the current thermistor to be detected based on the abnormality indication instruction.
In one embodiment, the heating state data further comprises: boiling in water;
the judging whether the heating state data meets the boiling completion condition includes:
and judging whether the boiling temperature reaches 100 ℃, if so, obtaining the boiling water heating time, and then judging whether the boiling water heating time is more than or equal to the preset boiling time.
In one embodiment, among the resistances of the multi-channel thermistor to be tested and the standard thermistor collected by the multi-channel resistance value collecting module,
obtaining the resistance value of a thermistor to be tested, comprising the following steps:
calculating the resistance value of the thermistor to be detected according to the following calculation formula;
(Rmeasuring×1024)/ADX)-RMeasuring＝RX；
Wherein R isMeasuringThe resistance value of the test resistor is expressed and is 20k omega; rXRepresenting the resistance value of the thermistor to be tested; ADXThe sampling value of the thermistor to be detected, which is acquired by the multi-path resistance value acquisition module, is represented; 1024 is the sampling precision of the multi-path resistance value acquisition module;
collecting the resistance value of a standard thermistor, comprising:
calculating the resistance value of the thermistor to be detected according to the following calculation formula;
(Rmeasuring×1024)/ADa)-RMeasuring＝Ra；
Wherein R isMeasuringThe resistance value of the test resistor is expressed and is 20k omega; r isaRepresenting the resistance value of the standard thermistor; ADaRepresenting the acquisition of the standard thermistor acquired by the multi-path resistance acquisition moduleA sample value; 1024 is the sampling precision of the multi-path resistance value acquisition module.
In one embodiment, the comparing the resistance value of the current thermistor to be tested with the resistance value of the standard thermistor to obtain a resistance value test result includes:
calculating the resistance value difference between the current thermistor to be tested and the standard thermistor;
judging whether the resistance value difference is within a preset error range, if so, judging that the resistance value test result is that the resistance value test is qualified; if not, the resistance value test result is that the resistance value test is unqualified.
In one embodiment, the exception indication instruction includes: a light-up instruction or an alarm instruction;
the generating of the abnormal indication instruction corresponding to the current thermistor to be tested based on the resistance value test result of the current thermistor to be tested comprises the following steps:
when the abnormal indication module comprises an LED indicator lamp, generating a lamp-on instruction based on a resistance test result qualified in the resistance test;
and when the abnormal indication module comprises an interactive screen, generating an alarm instruction based on a resistance test result qualified in the resistance test.
The technical scheme provided by the application can comprise the following beneficial effects:
the system controls the mode switching module to switch a circuit connected with a thermistor to be tested according to heating state data output by the boiling experiment module, so that the thermistor is switched from a boiling state to a resistance test state, automatic switching of a test flow is realized, and a tester does not need to move the thermistor to be tested out of boiling equipment and transfer the thermistor to be tested to a resistance test station; because the multi-path resistance value acquisition module is connected with the control module and is provided with a plurality of ports connected with the thermistors to be detected and the standard thermistors, different thermistors to be detected can be identified according to different ports, the acquired resistance values correspond to the thermistors to be detected one by one, no additional mark is needed, and the synchronous acquisition of the multi-path thermistors to be detected can be realized; the control module sends an instruction to the abnormal indication module connected with the control module based on the resistance test result obtained by comparison, the abnormal indication module outputs abnormal prompt information according to the instruction to remind a tester of the detection result of each thermistor to be detected, the control module monitors the resistance test process in real time and is matched with the abnormal indication module to alarm unqualified thermistors to be detected in time, so that the labor for monitoring the resistance test process is saved, meanwhile, misjudgment caused by visual fatigue is avoided, and the reliability of thermistor detection is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application, as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the application.
FIG. 1 is a schematic diagram of a multi-channel thermistor detection system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of another configuration of a multi-channel thermistor detection system according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a mode switching module according to an embodiment of the present application;
FIG. 4 is a schematic flow chart of a multi-channel thermistor detection method according to an embodiment of the present application;
fig. 5 is another schematic flow chart of a multi-channel thermistor detection method according to an embodiment of the present application.
Detailed Description
Preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Example one
In the traditional thermistor detection process, generally, a boiling device is used for uniformly boiling the thermistor to be detected for 1000 hours, then a universal meter is used for respectively testing the resistance value of each boiled thermistor to be detected, the testing time reaches 96 hours, and in the process, a tester is required to monitor resistance value testing data all the time, so that the labor is consumed;
if the resistance value of a plurality of thermistors to be tested needs to be tested simultaneously, in order to ensure that the resistance value test data can be matched with the thermistors one by one, each thermistor to be tested needs to be marked respectively, and the number of the thermistors to be tested, which can be monitored simultaneously by one tester, is limited, so that the thermistors cannot be tested in large batch, and the detection efficiency of the thermistors is low.
In view of the above problems, embodiments of the present application provide a multi-channel thermistor detection system, which can implement synchronous detection of multiple channels of thermistors to be detected.
The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a multi-channel thermistor detection system according to an embodiment of the present application.
Referring to fig. 1, a multi-channel thermistor sensing system includes:
the device comprises a multi-path resistance value acquisition module, a water boiling experiment module, a mode switching module, an abnormality indication module and a control module.
The output end of the multi-path resistance value acquisition module is connected with the input end of the control module, and the multi-path resistance value acquisition module is provided with a plurality of ports connected with the thermistor to be detected and the standard thermistor and used for acquiring the resistance value of the resistor;
the output end of the abnormity indication module is connected with the input end of the control module, the control module receives the resistance values collected by the multi-path resistance value collection module, compares the resistance values of the thermistor to be detected and the standard thermistor to obtain a resistance value test result, controls the abnormity indication module to output abnormity prompt information according to the resistance value test result, and completes detection of the thermistor to be detected.
The output end of the boiling experiment module is connected with the input end of the control module, the output end of the control module is connected with the input end of the mode switching module, before the resistance values of the multi-path resistance value acquisition module are acquired, the control module controls the mode switching module to execute mode switching actions according to heating state data output by the boiling experiment module, and after the multi-path thermistor to be detected is switched to a resistance value test state from a boiling state, the multi-path resistance value acquisition module is controlled to acquire the resistance values.
In the embodiment of the present application, the mode switching module performs a mode switching operation to switch the mode of the thermistor to be tested from the water boiling mode to the resistance value testing mode, and accordingly, the multi-channel thermistor to be tested is switched from the water boiling state to the resistance value testing state.
Wherein, the water boiling mode is that the thermistor is directly electrified for 5V and is placed in boiling water at 100 ℃; the test mode is also that the thermistor is placed in a boiling water environment at 100 ℃, and the resistance value test can be carried out only after the thermistor is connected in series with a test resistor, wherein the thermistor is not directly powered on for 5V due to different circuits.
The embodiment of the application provides a multi-channel thermistor detection system comprising a multi-channel resistance acquisition module, a boiling experiment module, a mode switching module, an abnormality indication module and a control module, wherein the system controls the mode switching module to switch a circuit accessed by a thermistor to be tested according to heating state data output by the boiling experiment module, so that the thermistor is switched from a boiling state to a resistance test state, automatic switching of a test flow is realized, and a tester does not need to move the thermistor to be tested out of boiling equipment and transfer the thermistor to be tested to a resistance test station; because the multi-path resistance value acquisition module is connected with the control module and is provided with a plurality of ports connected with the thermistors to be detected and the standard thermistors, different thermistors to be detected can be identified according to different ports, the acquired resistance values correspond to the thermistors to be detected one by one, no additional mark is needed, and the synchronous acquisition of the multi-path thermistors to be detected can be realized; the control module sends an instruction to the abnormal indication module connected with the control module based on the resistance test result obtained by comparison, the abnormal indication module outputs abnormal prompt information according to the instruction to remind a tester of the detection result of each thermistor to be detected, the control module monitors the resistance test process in real time and is matched with the abnormal indication module to alarm unqualified thermistors to be detected in time, so that the labor for monitoring the resistance test process is saved, meanwhile, misjudgment caused by visual fatigue is avoided, and the reliability of thermistor detection is improved.
Example two
In practical application, a PIC single chip microcomputer can be used as a main control chip to control the multiplexing chip to collect the resistance values of the multiple paths of thermistors to be tested, and a multiple-path thermistor detection system is built by combining the water boiling experiment module, the mode switching module and the abnormality indication module to realize the synchronous collection of the multiple paths of thermistors to be tested, monitor the resistance value test process in real time and timely alarm unqualified thermistors to be tested by matching the abnormality indication module.
The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Fig. 2 is another schematic structural diagram of a multi-thermistor detection system according to an embodiment of the present application.
Referring to fig. 2, a multi-channel thermistor sensing system includes:
the device comprises a multi-path resistance value acquisition module, a water boiling experiment module, a mode switching module, an abnormality indication module and a control module; the output end of the multi-path resistance value acquisition module is connected with the input end of the control module and is provided with a plurality of ports connected with the thermistor to be detected and the standard thermistor; the output end of the abnormality indication module is connected with the input end of the control module; the output end of the water boiling experiment module is connected with the input end of the control module, and the output end of the control module is connected with the input end of the mode switching module, so that the control module controls the mode switching module to execute the mode switching action.
Wherein, the control module includes: a PIC single chip microcomputer; the PIC singlechip is provided with N A/D conversion ports, and N is an integer greater than 2; the A/D conversion port is connected with a multi-path resistance value acquisition module, so that the A/D conversion port is divided into M paths by the multi-path resistance value acquisition module to carry out M-1 paths of thermistor resistance value acquisition to be tested and 1 path of quasi-thermistor resistance value acquisition, and M is an integer greater than 2; the input end and the output end of the PIC singlechip are respectively connected with the boiling experiment module and the mode switching module.
In the practical application process, the PIC singlechip can adopt a PIC18F6720 chip, and correspondingly, a multi-channel thermistor detection system built by the PIC18F6720 chip controls 8 channels of A/D conversion ports by utilizing the chip.
It should be noted that, in the practical application process, a multi-channel thermistor detection system can be built by adopting PIC single-chip microcomputers of other models.
Further, multichannel resistance collection module includes: n multiplexing chips; the multiplexing chip has at least M input terminals.
The output end of the multiplexing chip is connected with an A/D conversion port of the PIC singlechip, so that the PIC singlechip can acquire at least M multiplied by N resistance values of the resistors, wherein N multiplied (M-1) is the resistance value of the thermistor to be detected, and N is the resistance value of the standard thermistor.
In the embodiment of the application, the MC14051 chip is used as a multiplexing chip, and the output end of the MC14051 chip is connected with the A/D conversion port of the PIC singlechip, so that the A/D conversion interface can be divided into 8 paths for carrying out resistance value acquisition of 7 paths of thermistors to be tested and resistance value acquisition of 1 path of quasi-thermistors.
If the PIC singlechip is a PIC18F6720 chip, 8A/D conversion ports of the PIC18F6720 chip are used for connecting the MC14051 chip, so that 1A/D conversion interface is divided into 8 paths for resistance value acquisition, specifically, 7 paths of thermistors to be detected and 1 path of thermistors to be detected, thereby realizing the resistance value acquisition of 8 paths of thermistors to be detected and 56 paths of thermistors to be detected, simultaneously detecting 64 paths of thermistors in total, and realizing the mass detection of the resistance values of the thermistors.
In the embodiment of the present invention, the type of the multiplexing chip is not strictly limited, and in the practical application, a 74HC4066D chip may be used as the multiplexing chip, and the number of input lines of the multiplexing chip is not limited here.
Further, the abnormality indication module is configured to output abnormality prompt information according to a resistance value test result of the thermistor to be tested, and in an actual application process, an implementation form of the abnormality indication module outputting the abnormality prompt information is not unique, which is exemplary:
the anomaly indication module comprises: n (M-1) LED indicator lamps;
the N (M-1) LED indicating lamps correspond to the thermistors to be tested on the N (M-1) paths one by one, and the input end of each LED indicating lamp is connected with the output end of the control module, so that the LED indicating lamps are turned on or off under the control of the control module.
In the embodiment of the application, each path of thermistor to be tested is connected with one LED indicator lamp, and when the control module judges that the resistance value test of the thermistor to be tested is unqualified, the LED indicator lamp of the path of thermistor to be tested is controlled to be turned on to prompt a tester that the thermistor to be tested is abnormal, so that the unqualified product of the thermistor is detected.
Further, the LED indicator lamp can be arranged to display light with different colors to convey an abnormity prompting message, for example, the LED indicator lamp displays red light to indicate that the thermistor to be tested is abnormal.
And/or
The anomaly indication module comprises: an interactive screen;
the interactive screen is connected with the control module and used for receiving and displaying the resistance values of the multiple paths of thermistors to be tested in real time through the control module and receiving and displaying the abnormal prompt information sent by the control module.
In practical application, an interactive screen integrated with a voice broadcast function can be adopted, and the output of the abnormal prompt information can be carried out in the form of text information and voice information.
It should be noted that, the above-mentioned implementation form of the abnormality prompting message may alternatively or simultaneously be applied to the present application, that is, the abnormality indicating module of the present application may include one or more of an LED indicator and an interactive screen.
In the embodiment of the application, the interactive screen is connected to the PIC18F6720 chip through an RS485 serial port to an RS232 serial port, and performs information communication according to a set communication protocol, so that the interactive screen displays the resistance values of all thermistors to be tested and system operation information in the current test in real time, wherein the system operation information includes but is not limited to the mode of the thermistor to be tested.
The multichannel thermistor detecting system that this application embodiment shows utilizes a plurality of AD conversion ports of PIC singlechip to control multichannel thermistor's that await measuring resistance collection, and combine a plurality of multiplexing chips, divide an AD conversion port into the multichannel and carry out resistance collection, because each input of multiplexing chip is independent separately, and with the multichannel thermistor one-to-one that awaits measuring, consequently, can discern different thermistor that await measuring according to different ports, then with the resistance value of gathering and the thermistor one-to-one that awaits measuring, need not extra mark, can realize multichannel thermistor's that await measuring synchronous acquisition.
EXAMPLE III
For the mode switching module in the first embodiment, the embodiment of the present application is designed to complete the switching of the modes of the multiple thermistors to be tested.
Fig. 3 is a schematic structural diagram of a mode switching module according to an embodiment of the present application.
Referring to fig. 3, the mode switching module includes: k IC chips, K × P relays, and 2 × (K × P) test resistances;
wherein K is an integer greater than 2 and P is an integer greater than 2.
In the embodiment of the application, the IC chip is provided with at least P output ends, wherein the output ends are connected with the relay, so that the relay is controlled to be switched from a normally open state to a normally closed state by the IC chip under the control of the control module;
the relay K1 is connected with two test resistors RMeasuringAnd the relay K1 has two normally open pins 3, two normally closed pins 5 and two common points 4; wherein the resistance R is testedMeasuringOne end of the relay is connected with a normally closed pin 5 of the relay K1, and the other end of the relay is grounded; normally-open pin 3 of relay K1 is grounded; thermistor R to be testedXOne end of the test power supply is connected with the common point 4 of the relay K1, the other end of the test power supply is connected with the test power supply, the voltage of the test power supply is +5V, when the relay K1 is in a normally open state, the normally open pin 3 is conducted with the common point 4, and the test power supply is directly grounded through the thermistor to be tested; when the relay K1 is in a normally closed state, the normally closed pin 5 is conducted with the common point 4, the thermistor to be tested and the test resistor divide the test voltage, and the multi-path resistance value acquisition module acquires the divided voltage of the thermistor to be tested.
Further, the boiling experiment module comprises: a water boiling device, a temperature sensor and a timer;
the temperature sensor is arranged on the water boiling device, and the output end of the temperature sensor is connected with the input end of the control module and used for detecting the water boiling temperature of the water boiling device in real time and sending the water boiling temperature to the control module;
the output end of the control module is connected with the input end of the timer, so that the control module controls the timer to be started when the boiling temperature reaches 100 ℃, and controls the mode switching module to execute the mode switching action when the timer times to reach the preset boiling time.
In the embodiment of the application, the temperature sensor detects the boiling temperature of the boiling device in real time, and when the boiling temperature reaches 100 ℃, the control module controls the timer to be started and detects the heating time of boiling water in a timing mode; when the boiling water heating duration reaches the preset water boiling duration, the control module controls the mode switching module to execute the mode switching action.
In the embodiment of the present application, taking an IC2003 chip as an example, the IC2003 chip has at least 7 output terminals, and the mode switching module includes 4 IC chips:
if the adopted PIC singlechip is a PIC18F6720 chip, the control of 4 IC2003 chips is finished through the PIC6720 main control chip, each IC2003 chip controls 7 relays, the control of 28 relays can be finished, each relay controls two paths of thermistors to be detected, and then the control of the mode of 56 paths of thermistors to be detected is finished.
In the thermistor detection, the mode of the thermistor to be detected includes a water boiling mode and a resistance value test mode, and in the embodiment of the present application, the process of the module control mode switching module to execute the mode switching action specifically includes: when the timer detects that the boiling water heating duration reaches the preset boiling time duration, the control module sends a corresponding instruction to the IC2003 chip, then the IC2003 chip controls the common point of the 7 relays connected with the IC2003 chip to be disconnected with the normally-open pin and to be switched to be connected with the normally-closed pin, so that the thermistor to be tested is changed into a resistance value test state connected with the test resistor in series from the boiling state in which one end is grounded and the other end is directly connected with the test power supply.
The multi-channel thermistor detection system provided by the embodiment of the application can control the mode switching module to switch the circuit connected with the thermistor to be detected according to the heating state data output by the boiling experiment module, including the boiling water heating duration, so that the thermistor to be detected is switched from the boiling state to the resistance value test state, the automatic switching of the test process is realized, a tester does not need to move the thermistor to be detected out of the boiling equipment and transfer the thermistor to the resistance value test station, the switching among the processes is smooth and quick in the thermistor detection process, and a large amount of labor can be saved; meanwhile, the time of boiling of the thermistor is controlled by combining the timer with the control module, the resistance value test mode is automatically entered, the time is not required to be monitored manually, and the detection efficiency is improved.
Example four
Corresponding to the multi-channel thermistor detection system, the application also provides a multi-channel thermistor detection method and a corresponding embodiment.
Fig. 4 is a schematic flowchart of a multi-channel thermistor detection method according to an embodiment of the present application.
Referring to fig. 4, a multi-channel thermistor detection method includes:
401. acquiring heating state data of the water boiling heating module;
the heating state data comprises but is not limited to the heating time of boiling water, in the traditional thermistor detection, the thermistor needs to be placed in the boiling water for boiling for 1000 hours, and the thermistor is monitored and timed manually, so that manpower is consumed, and therefore, the heating time of the boiling water is automatically monitored through the boiling heating module.
402. Judging whether the heating state data meet the boiling completion condition or not;
if yes, go to step 403;
if not, returning to the step 401;
in the embodiment of the present application, the poaching completion conditions include: the boiling water heating time is longer than or equal to the preset boiling time.
403. Controlling a mode switching module to execute a mode switching action;
in the embodiment of the present application, a specific implementation manner of the mode switching module executing the mode switching action has been described in the third embodiment, and is not described herein again.
404. Acquiring the resistance values of the multi-path thermistor to be detected and the standard thermistor which are acquired by the multi-path resistance value acquisition module;
taking the resistance value of a thermistor to be tested as an example, the thermistor to be tested obtains the resistance value of the thermistor to be tested according to the following calculation formula:
(Rmeasuring×1024)/ADX)-RMeasuring＝RX；
Wherein R isMeasuringThe resistance value of the test resistor is expressed and is 20k omega; rXRepresenting the resistance value of the thermistor to be tested; ADXThe sampling value of the thermistor to be detected, which is acquired by the multi-path resistance value acquisition module, is represented; 1024 is the sampling precision of the multi-path resistance value acquisition module.
And calculating the resistance value of the standard thermistor according to the following calculation formula to obtain the resistance value of the thermistor to be measured:
(Rmeasuring×1024)/ADa)-RMeasuring＝Ra；
Wherein R isMeasuringThe resistance value of the test resistor is expressed and is 20k omega; raRepresenting the resistance value of the standard thermistor; ADaThe sampling value of the standard thermistor collected by the multi-path resistance value collection module is represented; 1024 is the sampling precision of the multi-path resistance value acquisition module.
In the embodiment of the application, the standard thermistor and the test resistor are connected in series in a circuit with 5V supply voltage.
405. Comparing the resistance values of the multiple paths of thermistors to be tested with the resistance value of the standard thermistor respectively to obtain abnormal prompt information of each thermistor to be tested;
in this embodiment of the present application, comparing the resistance value of a thermistor to be tested with the resistance value of a standard thermistor to obtain the abnormal prompt information of the thermistor to be tested, includes:
comparing the resistance value of the current thermistor to be tested with the resistance value of the standard thermistor to obtain a resistance value test result; generating an abnormal indication instruction corresponding to the current thermistor to be tested based on a resistance value test result of the current thermistor to be tested; and controlling an abnormality indication module to output the abnormality prompt information of the current thermistor to be detected based on the abnormality indication instruction.
In the embodiment of the present application, a specific implementation manner of the abnormality indication module outputting the abnormality prompt information of the current thermistor to be tested has been described in the second embodiment, and details are not described here.
The embodiment of the application provides a multichannel thermistor detection method, with any kind of multichannel thermistor detecting system looks adaptation in above-mentioned embodiment, heating state data through boiling heating module, automatic start mode switches the mode that the thermistor that awaits measuring is located of module switching, then when this thermistor that awaits measuring is in resistance test mode, compare it with standard thermistor, whether unusual with the thermistor that judges this thermistor that awaits measuring, thereby detect and screen out the defective work, this detection process automation degree is high, and can carry out multichannel detection thermistor's that awaits measuring detection in step, detection efficiency has been promoted by a wide margin.
EXAMPLE five
Corresponding to the multi-channel thermistor detection system, the application also provides another multi-channel thermistor detection method and a corresponding embodiment.
Fig. 5 is another schematic flow chart of a multi-channel thermistor detection method according to an embodiment of the present application.
Referring to fig. 5, a multi-channel thermistor detection method includes:
501. acquiring the water boiling temperature of the water boiling heating module;
in the embodiment of the application, the boiling temperature is detected by the temperature sensor in real time.
502. Judging whether the water boiling temperature reaches 100 ℃;
if yes, go to step 503;
if not, returning to the step 501;
in the thermistor detection, the thermistor needs to be placed in boiling water for boiling for 1000 hours before the resistance value of the thermistor to be detected is tested, so that the boiling water heating time of the thermistor to be detected needs to be calculated after the boiling temperature reaches 100 ℃.
503. Acquiring the boiling water heating duration of the water boiling heating module;
in this embodiment of the application, the content of step 503 is the same as that of step 401 in the fourth embodiment, and is not described herein again.
504. Judging whether the boiling water heating time is longer than or equal to the preset boiling time;
if yes, go to step 505;
if not, returning to step 503;
in the embodiment of the present application, the content of step 504 is the same as that of step 402 in the fourth embodiment, and details are not described here.
505. Controlling a mode switching module to execute a mode switching action;
in the embodiment of the present application, the content of step 505 is the same as that of step 403 in the fourth embodiment, and details are not described here.
506. Acquiring the resistance values of the multi-path thermistor to be detected and the standard thermistor which are acquired by the multi-path resistance value acquisition module;
in the embodiment of the present application, the content of step 506 is the same as that of step 404 in the fourth embodiment, and is not described herein again.
507. Comparing the resistance value of each thermistor to be tested with the resistance value of the standard thermistor to obtain a resistance value test result;
the following are exemplary:
calculating the resistance value difference between the current thermistor to be tested and the standard thermistor;
judging whether the resistance value difference is within a preset error range, if so, judging that the resistance value test result is that the resistance value test is qualified; if not, the resistance value test result is that the resistance value test is unqualified.
In the embodiment of the application, the standard thermistor is a thermistor which is selected in advance, has the same parameters as the thermistor to be tested and is qualified, so that the standard thermistor is used as a comparison group, the resistance difference between the current thermistor to be tested and the standard thermistor is compared under the same environment, and if the resistance difference is not within a preset error range, the performance of the thermistor is seriously reduced, and the thermistor is abnormal and is an unqualified product.
In practical applications, the preset error range may be set according to practical situations, and is not limited herein.
508. Generating an abnormal indication instruction corresponding to the current thermistor to be tested based on a resistance value test result of the current thermistor to be tested;
in an embodiment of the present application, the exception indicating instruction includes: a light-up instruction or an alarm instruction;
when the abnormal indication module comprises an LED indicator lamp, generating a lamp-on instruction based on a resistance test result qualified in the resistance test;
and when the abnormal indication module comprises an interactive screen, generating an alarm instruction based on a resistance test result qualified in the resistance test.
509. And controlling an abnormality indication module to output the abnormality prompt information of the current thermistor to be detected based on the abnormality indication instruction.
When the abnormality indicating module comprises an LED indicating lamp, the LED indicating lamp is turned on according to the lamp turning-on instruction to indicate that the corresponding thermistor to be detected is abnormal;
and when the abnormality indication module comprises an interactive screen, the interactive screen generates text information representing the abnormality of the corresponding thermistor to be detected according to the alarm instruction and displays the text information on the screen.
The execution operation module corresponding to each step in the above embodiments has been described in detail in the embodiments related to the system, and will not be elaborated here.
The aspects of the present application have been described in detail hereinabove with reference to the accompanying drawings. In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments. Those skilled in the art should also appreciate that the acts and modules referred to in the specification are not necessarily required in the present application. In addition, it can be understood that the steps in the method of the embodiment of the present application may be sequentially adjusted, combined, and deleted according to actual needs, and the modules in the device of the embodiment of the present application may be combined, divided, and deleted according to actual needs.
Furthermore, the method according to the present application may also be implemented as a computer program or computer program product comprising computer program code instructions for performing some or all of the steps of the above-described method of the present application.
Alternatively, the present application may also be embodied as a non-transitory machine-readable storage medium (or computer-readable storage medium, or machine-readable storage medium) having stored thereon executable code (or a computer program, or computer instruction code) which, when executed by a processor of an electronic device (or electronic device, server, etc.), causes the processor to perform part or all of the various steps of the above-described method according to the present application.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the applications disclosed herein may be implemented as electronic hardware, computer software, or combinations of both.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems and methods according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or improvements to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (12)
1. A multi-channel thermistor sensing system, comprising: the device comprises a multi-path resistance value acquisition module, a water boiling experiment module, a mode switching module, an abnormality indication module and a control module;
the output end of the multi-path resistance value acquisition module is connected with the input end of the control module, is provided with a plurality of ports connected with the thermistor to be tested and the standard thermistor, and is used for acquiring the resistance value of the resistor and transmitting the resistance value to the control module for comparison to obtain a resistance value test result;
the output end of the abnormal indication module is connected with the input end of the control module, so that the control module controls the abnormal indication module to output abnormal prompt information according to the resistance value test result;
the output end of the boiling experiment module is connected with the input end of the control module, and the output end of the control module is connected with the input end of the mode switching module, so that the control module controls the mode switching module to execute mode switching actions according to heating state data output by the boiling experiment module, and the multi-path thermistor to be tested is switched from a boiling state to a resistance value testing state.
2. The multi-channel thermistor detection system according to claim 1,
the control module includes: a PIC single chip microcomputer;
the PIC singlechip is provided with N A/D conversion ports, wherein N is an integer greater than 2; the A/D conversion port is connected with the multi-path resistance value acquisition module, so that the A/D conversion port is divided into M paths by the multi-path resistance value acquisition module to carry out M-1 paths of resistance value acquisition of the thermistor to be tested and 1 path of resistance value acquisition of the quasi thermistor, and M is an integer greater than 2;
and the input end and the output end of the PIC singlechip are respectively connected with the water boiling experiment module and the mode switching module.
3. The multi-channel thermistor detection system according to claim 2,
the multichannel resistance collection module includes: n multiplexing chips; the multiplexing chip at least has M input ends;
the output end of the multiplexing chip is connected with an A/D conversion port of the PIC singlechip, so that the PIC singlechip can acquire at least MXN paths of resistance values, wherein the NXX (M-1) paths are the resistance values of the thermistor to be detected, and the N paths are the resistance values of the standard thermistor.
4. The multi-channel thermistor detection system according to claim 1,
the mode switching module comprises: k IC chips, K × P relays, and 2 × (K × P) test resistances; k is an integer greater than 2, and P is an integer greater than 2;
the IC chip is provided with at least P output ends, wherein the output ends of the IC chip are connected with a relay, so that the IC chip controls the relay to be switched from a normally open state to a normally closed state under the control of the control module;
the relay is connected with the two test resistors and is provided with two normally open pins, two normally closed pins and two common points; one end of the test resistor is connected with a normally closed pin of the relay, and the other end of the test resistor is grounded; a normally open pin of the relay is grounded; one end of the thermistor to be tested is connected with the common point of the relay, and the other end of the thermistor to be tested is connected with the test power supply, so that when the relay is in a normally open state, the normally open pin is conducted with the common point, and the test power supply is directly grounded through the thermistor to be tested; when the relay is in a normally closed state, the normally closed pin is conducted with the common point, the thermistor to be tested and the test resistor divide the test voltage, and the multi-path resistance value acquisition module acquires the divided voltage of the thermistor to be tested.
5. The multi-channel thermistor detection system according to claim 1,
the poaching experiment module comprises: a water boiling device, a temperature sensor and a timer;
the temperature sensor is arranged on the water boiling device, and the output end of the temperature sensor is connected with the input end of the control module and used for detecting the water boiling temperature of the water boiling device in real time and sending the water boiling temperature to the control module;
the output end of the control module is connected with the input end of the timer, so that the control module controls the timer to be started when the boiling temperature reaches 100 ℃, and controls the mode switching module to execute the mode switching action when the timer times to reach the preset boiling time.
6. The multi-channel thermistor detection system according to claim 3,
the anomaly indication module comprises: n (M-1) LED indicator lamps;
the N (M-1) LED indicator lamps correspond to the thermistors to be tested on the N (M-1) paths one by one, and the input ends of the LED indicator lamps are connected with the output end of the control module, so that the LED indicator lamps are turned on or off under the control of the control module.
7. The multi-channel thermistor detection system according to claim 1,
the abnormality indicating module includes: an interactive screen;
the interactive screen is connected with the control module and used for receiving and displaying the resistance values of the multiple paths of thermistors to be tested in real time through the control module and receiving and displaying the abnormal prompt information sent by the control module.
8. A multi-channel thermistor detecting method, realized based on the multi-channel thermistor detecting system according to any one of claims 1 to 7, comprising:
acquiring heating state data of the water boiling heating module; the heating state data includes: heating in boiling water for a long time;
judging whether the heating state data meet a water boiling completion condition or not, wherein the water boiling completion condition comprises the following steps: the boiling water heating time is more than or equal to the preset boiling time;
if so, controlling the mode switching module to execute the mode switching action, acquiring the resistance values of the multi-path thermistor to be tested and the standard thermistor which are acquired by the multi-path resistance value acquisition module, and comparing the resistance values of the multi-path thermistor to be tested with the resistance value of the standard thermistor respectively to obtain abnormal prompt information of each thermistor to be tested;
the method for obtaining the abnormal prompt information of the thermistor to be tested by comparing the resistance value of the thermistor to be tested with the resistance value of the standard thermistor comprises the following steps: comparing the resistance value of the current thermistor to be tested with the resistance value of the standard thermistor to obtain a resistance value test result; generating an abnormal indication instruction corresponding to the current thermistor to be tested based on a resistance value test result of the current thermistor to be tested; and controlling an abnormality indication module to output the abnormality prompt information of the current thermistor to be detected based on the abnormality indication instruction.
9. The multi-channel thermistor detecting method according to claim 8,
the heating state data further includes: boiling in water;
the judging whether the heating state data meets the boiling completion condition includes:
and judging whether the boiling temperature reaches 100 ℃, if so, obtaining the boiling water heating time, and then judging whether the boiling water heating time is more than or equal to the preset boiling time.
10. The multi-channel thermistor detecting method according to claim 8, wherein the obtaining multi-channel resistance value collecting module collects resistance values of the multi-channel thermistor to be detected and the standard thermistor,
obtaining the resistance value of a thermistor to be tested, comprising the following steps:
calculating the resistance value of the thermistor to be detected according to the following calculation formula;
(Rmeasuring×1024)/ADX)-RMeasuring＝RX；
Wherein R isMeasuringThe resistance value of the test resistor is expressed and is 20k omega; rXRepresenting the resistance value of the thermistor to be tested; ADXThe sampling value of the thermistor to be detected, which is acquired by the multi-path resistance value acquisition module, is represented; 1024 is the sampling precision of the multi-path resistance value acquisition module;
collecting the resistance value of a standard thermistor, comprising:
calculating the resistance value of the thermistor to be detected according to the following calculation formula;
(Rmeasuring×1024)/ADa)-RMeasuring＝Ra；
Wherein R isMeasuringThe resistance value of the test resistor is expressed and is 20k omega; raRepresenting the resistance value of the standard thermistor; ADaThe sampling value of the standard thermistor collected by the multi-path resistance value collection module is represented; 1024 is the sampling precision of the multi-path resistance value acquisition module.
11. The multi-channel thermistor detecting method according to claim 8, wherein the comparing the current resistance value of the thermistor to be detected with the resistance value of the standard thermistor to obtain a resistance value test result comprises:
calculating the resistance value difference between the current thermistor to be tested and the standard thermistor;
judging whether the resistance value difference is within a preset error range, if so, judging that the resistance value test result is that the resistance value test is qualified; if not, the resistance value test result is that the resistance value test is unqualified.
12. The multi-channel thermistor detecting method according to claim 11,
the exception indication instruction includes: a light-up instruction or an alarm instruction;
the generating of the abnormal indication instruction corresponding to the current thermistor to be tested based on the resistance value test result of the current thermistor to be tested comprises the following steps:
when the abnormal indication module comprises an LED indicator lamp, generating a lamp-on instruction based on a resistance test result qualified in the resistance test;
and when the abnormal indication module comprises an interactive screen, generating an alarm instruction based on a resistance test result qualified in the resistance test.
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