CN104990644A - Fault detection device and method of temperature sensor for refrigerator - Google Patents
Fault detection device and method of temperature sensor for refrigerator Download PDFInfo
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- CN104990644A CN104990644A CN201510388469.1A CN201510388469A CN104990644A CN 104990644 A CN104990644 A CN 104990644A CN 201510388469 A CN201510388469 A CN 201510388469A CN 104990644 A CN104990644 A CN 104990644A
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Abstract
The invention discloses a fault detection device of a temperature sensor for a refrigerator and a detection method using the device. The fault detection device includes a detection terminal used for connecting a temperature sensor to be detected, a controller, a display and a power source module; an AD converter is arranged in the controller; an AD meter is pre-stored in the controller; the controller acquires the voltage value of the temperature sensor to be detected through a detection pin and converts the voltage value of the temperature sensor to be detected to an AD value through the AD converter, and acquires the temperature of the temperature sensor to be detected through inquiring the AD meter according to the AD value; the display displays the temperature of the temperature sensor to be detected obtained by the controller so that whether a fault occurs on the temperature sensor to be detected can be judged; and the power source module is connected with the controller and the display respectively so as to supply power for the controller and the display. The fault detection device has the advantages of high detection speed and high detection accuracy.
Description
Technical field
The present invention relates to technical field of refrigeration equipment, particularly a kind of failure detector of the temperature sensor for refrigerator and a kind of fault detection method of the temperature sensor for refrigerator.
Background technology
At present, sensor supplied materials detects and in refrigerator finished product, the detection of sensor quality all uses multimeter, namely inquires about AD conversion table to obtain the temperature of sensor by the resistance of detecting sensor, then judges according to the quality of temperature to sensor of acquisition.
Detect owing to using multimeter and there is the shortcomings such as detection speed is slow, accuracy of detection is low, and need to search the temperature that corresponding AD conversion table could obtain sensor, make troubles to quick supplied materials detection and refrigerator rapid-maintenance.
Summary of the invention
The present invention is intended to solve one of technical matters in correlation technique at least to a certain extent.For this reason, one object of the present invention is to propose that a kind of detection speed is fast, accuracy of detection is high, and the failure detector of the simple and reliable temperature sensor for refrigerator.
Another object of the present invention is the fault detection method proposing a kind of temperature sensor for refrigerator.
For achieving the above object, one aspect of the present invention embodiment proposes a kind of failure detector of the temperature sensor for refrigerator, comprise: detection terminal, the first end of described detection terminal is connected with the power supply of the first predeterminated voltage, and described detection terminal is for connecting temperature sensor to be measured; Controller, the detection pin of described controller is connected with the second end of described detection terminal by the first resistance, in described controller, AD converter is set, and prestore AD table, described controller gathers the magnitude of voltage of described temperature sensor to be measured by described detection pin, and convert the magnitude of voltage of described temperature sensor to be measured to AD value by described AD converter, and show with the temperature obtaining described temperature sensor to be measured by inquiring about described AD according to described AD value; Display, described display is connected with described controller, and the temperature of described display to the temperature sensor described to be measured that described controller obtains shows to judge whether described temperature sensor to be measured breaks down; And power module, described power module be connected with described display with described controller respectively with give described controller and described monitor power supply.
According to the failure detector of the temperature sensor for refrigerator of the embodiment of the present invention, temperature sensor to be measured is connected by detection terminal, in controller, AD converter is set, and prestore AD table, controller gathers the magnitude of voltage of temperature sensor to be measured by detecting pin, and convert the magnitude of voltage of temperature sensor to be measured to AD value by AD converter, and shown with the temperature obtaining temperature sensor to be measured by inquiry AD according to AD value, the temperature of display to the temperature sensor to be measured that controller obtains shows to judge whether temperature sensor to be measured breaks down, there is detection speed fast, accuracy of detection is high, result judges the advantages such as straightforward, effectively avoid being undertaken detecting brought detection speed by multimeter slow, the shortcomings such as accuracy of detection is low.
According to one embodiment of present invention, the power supply of described first predeterminated voltage is provided by described power module.
According to one embodiment of present invention, the second end of described detection terminal is also by the second resistance eutral grounding.
According to one embodiment of present invention, described power module specifically comprises: the first electric capacity, and one end of described first electric capacity is connected with the power supply of the second predeterminated voltage, the other end ground connection of described first electric capacity, wherein, described second predeterminated voltage is greater than described first predeterminated voltage; Second electric capacity, described second electric capacity and described first Capacitance parallel connection; First electrochemical capacitor, described first electrochemical capacitor and described second Capacitance parallel connection, the positive terminal of described first electrochemical capacitor is connected with the power supply of described second predeterminated voltage, the negative pole end ground connection of described first electrochemical capacitor; Voltage stabilizing chip, the input end of described voltage stabilizing chip is connected with the positive terminal of described first electrochemical capacitor, the ground end ground connection of described voltage stabilizing chip, and the default power supply of output terminal output of described voltage stabilizing chip is to give described controller and described monitor power supply respectively; Also be parallel with the second electrochemical capacitor, the 3rd electric capacity and the 4th electric capacity between the output terminal of described voltage stabilizing chip and ground, wherein, the positive terminal of described second electrochemical capacitor is connected with the output terminal of described voltage stabilizing chip, the negative pole end ground connection of described second electrochemical capacitor.
According to one embodiment of present invention, described display comprises LED display, the circuit of described LED display is made up of 21 light emitting diodes, the cells arranged in matrix that described 21 light emitting diodes arrange with 3 row 7, wherein, the negative electrode of 7 light emitting diodes in the first row respectively with SEG6 pin, SEG7 pin, SEG8 pin, SEG9 pin, SEG10 pin, the SEG11 pin of described LED display, SEG12 pin is corresponding is connected, the anode of 7 light emitting diodes in described the first row is all connected to the COM1 pin of described LED display; The negative electrode of 7 light emitting diodes in the second row respectively with SEG6 pin, SEG7 pin, SEG8 pin, SEG9 pin, SEG10 pin, the SEG11 pin of described LED display, SEG12 pin is corresponding is connected, the anode of 7 light emitting diodes in described second row is all connected to the COM2 pin of described LED display; The negative electrode of 7 light emitting diodes in the third line respectively with SEG6 pin, SEG7 pin, SEG8 pin, SEG9 pin, SEG10 pin, the SEG11 pin of described LED display, SEG12 pin is corresponding is connected, the anode of 7 light emitting diodes in described the third line is all connected to the COM3 pin of described LED display.
According to one embodiment of present invention, described display also comprises: Darlington integrated circuit, first to the 7th pin of described Darlington integrated circuit respectively with the SEG12 pin of described display, SEG11 pin, SEG10 pin, SEG9 pin, SEG8 pin, SEG7 pin, SEG6 pin correspondence is connected, 8th pin ground connection of described Darlington integrated circuit, 9th pin of described Darlington integrated circuit is connected with default power supply, ten to the ten six pin of described Darlington integrated circuit is connected to the SEG6 pin of described LED display respectively by a resistance correspondence, SEG7 pin, SEG8 pin, SEG9 pin, SEG10 pin, SEG11 pin, SEG12 pin, 5th electric capacity, described 5th electric capacity is connected between the 8th pin of described Darlington integrated circuit and the 9th pin.
According to one embodiment of present invention, described display also comprises: the 3rd resistance, and described one end of 3rd resistance is connected with the COM1 pin of described display; First triode, the base stage of described first triode is connected with the other end of described 3rd resistance, and the collector of described first triode is connected with the COM1 pin of described LED display, and the emitter of described first triode is connected with default power supply; 4th resistance, between the base stage that described 4th resistance is connected to described first triode and emitter; 5th resistance, described one end of 5th resistance is connected with the COM2 pin of described display; Second triode, the base stage of described second triode is connected with the other end of described 5th resistance, and the collector of described second triode is connected with the COM2 pin of described LED display, and the emitter of described second triode is connected with default power supply; 6th resistance, between the base stage that described 6th resistance is connected to described second triode and emitter; 7th resistance, described one end of 7th resistance is connected with the COM3 pin of described display; 3rd triode, the base stage of described 3rd triode is connected with the other end of described 7th resistance, and the described collector of the 3rd triode is connected with the COM3 pin of described LED display, and the emitter of described 3rd triode is connected with default power supply; 8th resistance, between the base stage that described 8th resistance is connected to described 3rd triode and emitter.
For achieving the above object, the present invention on the other hand embodiment proposes a kind of fault detection method of the temperature sensor for refrigerator, comprises the following steps: treat testing temperature sensor by detection terminal and detect; Gather the magnitude of voltage of described temperature sensor to be measured, and convert the magnitude of voltage of described temperature sensor to be measured to AD value; Show with the temperature obtaining described temperature sensor to be measured by inquiring about the AD prestored according to described AD value; And show to judge whether described temperature sensor to be measured breaks down to the temperature of described temperature sensor to be measured.
According to the fault detection method of the temperature sensor for refrigerator of the embodiment of the present invention, treat testing temperature sensor by detection terminal to detect, gather the magnitude of voltage of temperature sensor to be measured, and convert the magnitude of voltage of temperature sensor to be measured to AD value, show with the temperature obtaining temperature sensor to be measured by inquiring about the AD prestored according to AD value, and the temperature treating testing temperature sensor carries out showing to judge whether temperature sensor to be measured breaks down.Therefore, the fault detection method of the temperature sensor for refrigerator of the embodiment of the present invention has that detection speed is fast, accuracy of detection is high, result judges the advantages such as straightforward, effectively avoids being undertaken detecting the shortcomings such as brought detection speed is slow, accuracy of detection is low by multimeter.
In description of the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this instructions, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this instructions or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Accompanying drawing explanation
Fig. 1 is according to an embodiment of the invention for the block diagram of the failure detector of the temperature sensor of refrigerator.
Fig. 2 is the circuit diagram of power module according to an embodiment of the invention.
Fig. 3 is the circuit diagram of display according to an embodiment of the invention.
Fig. 4 is the circuit diagram of LED display according to an embodiment of the invention.
Fig. 5 is the peripheral circuit diagram of controller according to an embodiment of the invention.
Fig. 6 is the workflow diagram of controller according to an embodiment of the invention.
Fig. 7 is the process flow diagram of the fault detection method of the temperature sensor for refrigerator according to the embodiment of the present invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.
The fault detection method of the failure detector of the temperature sensor for refrigerator and the temperature sensor for refrigerator proposed according to the embodiment of the present invention is described with reference to the accompanying drawings.
Fig. 1 is according to an embodiment of the invention for the block diagram of the failure detector of the temperature sensor of refrigerator.As shown in Figure 1, this failure detector being used for the temperature sensor of refrigerator comprises: detection terminal 10, controller 20, display 30 and power module 40.
Wherein, the first end of detection terminal 10 is connected with the power supply of the first predeterminated voltage, detection terminal 10 is for connecting temperature sensor to be measured, the detection pin of controller 20 is connected with the second end of detection terminal 10 by the first resistance R1, in controller 20, AD converter is set, and prestore AD table, controller 20 gathers the magnitude of voltage of temperature sensor to be measured by detecting pin, and convert the magnitude of voltage of temperature sensor to be measured to AD value by AD converter, and shown with the temperature obtaining temperature sensor to be measured by inquiry AD according to AD value, display 30 is connected with controller 20, the temperature of the temperature sensor to be measured that display 30 pairs of controllers 20 obtain shows to judge whether temperature sensor to be measured breaks down, power module 40 is connected to power to controller 20 and display 30 respectively with display 30 with controller 20.Wherein, the first predeterminated voltage can be 5V.
Because the resistance of temperature sensor can change along with the change of temperature, when the resistance of temperature sensor changes, the magnitude of voltage also respective change of the detection pin reading of controller 20.If the resistance R of temperature sensor
nTCrepresent, then the magnitude of voltage of the detection pin reading of controller 20 is as shown in following formula (1):
V
jc＝5V*R
10/(R
NTC+R
10) (1)
Wherein, V
jcfor the magnitude of voltage that the detection pin of controller 20 reads, R
10it is the resistance of the first resistance R1.
By being out of shape above-mentioned formula (1), following formula (2) and formula (3) can be obtained:
Sampled voltage/reference voltage=R
10/ (R
nTC+ R
10) (2)
Wherein, the V in the corresponding above-mentioned formula (1) of sampled voltage
jc, the 5V in the corresponding above-mentioned formula (1) of reference voltage.
AD value/benchmark AD value=R
10/ (R
nTC+ R
10) (3)
Because magnitude of voltage and temperature value have certain relation, therefore controller 20 collect temperature sensor to be measured magnitude of voltage and after being converted to AD value, the temperature of temperature sensor to be measured can be obtained by inquiry AD table, then the temperature of the temperature sensor to be measured obtained is shown by display 30 by controller 20, so that testing staff is by judging the temperature data quality that judge temperature sensor whether consistent with actual temperature shown, effectively avoid the shortcomings such as the detection speed that brought by manual detection is slow, accuracy of detection is low.
According to one embodiment of present invention, the power supply of the first predeterminated voltage is provided by power module 40.
According to one embodiment of present invention, as shown in Figure 1, the second end of detection terminal 10 is also by the second resistance R2 ground connection GND.In addition, as shown in Figure 1, the failure detector of the above-mentioned temperature sensor for refrigerator can also comprise filter capacitor C6, and the magnitude of voltage of the temperature sensor to be measured that the detection pin of filter capacitor C6 to controller gathers carries out filtering process, to improve accuracy of detection.
According to one embodiment of present invention, as shown in Figure 2, power module 40 specifically comprises: the first electric capacity C1, second electric capacity C2, first electrochemical capacitor EC1, voltage stabilizing chip IC 1, second electrochemical capacitor EC2, 3rd electric capacity C3 and the 4th electric capacity C4, wherein, one end of first electric capacity C1 is connected with the power supply of the second predeterminated voltage, the other end ground connection GND of the first electric capacity C1, wherein, second predeterminated voltage is greater than the first predeterminated voltage, second electric capacity C2 is in parallel with the first electric capacity C1, first electrochemical capacitor EC1 is in parallel with the second electric capacity C2, the positive terminal of the first electrochemical capacitor EC1 is connected with the power supply of the second predeterminated voltage, the negative pole end ground connection GND of the first electrochemical capacitor EC1, the input end of voltage stabilizing chip IC 1 is connected with the positive terminal of the first electrochemical capacitor EC1, the ground end ground connection GND of voltage stabilizing chip IC 1, the output terminal of voltage stabilizing chip IC 1 exports presets power supply VCC to power to controller 20 and display 30 respectively, second electrochemical capacitor EC2, 3rd electric capacity C3 and the 4th electric capacity C4 is connected in parallel between the output terminal of voltage stabilizing chip IC 1 and ground GND, wherein, the positive terminal of the second electrochemical capacitor EC2 is connected with the output terminal of voltage stabilizing chip IC 1, the negative pole end ground connection GND of the second electrochemical capacitor EC2.Wherein, the second predeterminated voltage can be 12V.
According to one embodiment of present invention, as shown in Figure 3, display 30 comprises LED display 31, as shown in Figure 4, the circuit of LED display 31 is made up of 21 light emitting diodes, the cells arranged in matrix that 21 light emitting diodes arrange with 3 row 7, wherein, the negative electrode of 7 light emitting diodes (A1-G1) in the first row respectively with the SEG6 pin of LED display 31, SEG7 pin, SEG8 pin, SEG9 pin, SEG10 pin, SEG11 pin, SEG12 pin correspondence is connected, the anode of 7 light emitting diodes (A1-G1) in the first row is all connected to the COM1 pin of LED display 31, the negative electrode of 7 light emitting diodes (A2-G2) in the second row respectively with the SEG6 pin of LED display 31, SEG7 pin, SEG8 pin, SEG9 pin, SEG10 pin, SEG11 pin, SEG12 pin correspondence is connected, the anode of 7 light emitting diodes (A2-G2) in the second row is all connected to the COM2 pin of LED display 31, the negative electrode of 7 light emitting diodes (A3-G3) in the third line respectively with the SEG6 pin of LED display 31, SEG7 pin, SEG8 pin, SEG9 pin, SEG10 pin, SEG11 pin, SEG12 pin correspondence is connected, and the anode of 7 light emitting diodes (A3-G3) in the third line is all connected to the COM3 pin of LED display 31.
According to one embodiment of present invention, as shown in Figure 3, display 30 also comprises: Darlington integrated circuit (IC) 2 and the 5th electric capacity C5, wherein, first to the 7th pin of Darlington integrated circuit (IC) 2 respectively with the SEG12 pin of display 30, SEG11 pin, SEG10 pin, SEG9 pin, SEG8 pin, SEG7 pin, SEG6 pin correspondence is connected, 8th pin ground connection GND of Darlington integrated circuit (IC) 2, 9th pin of Darlington integrated circuit (IC) 2 is connected with default power supply VCC, ten to the ten six pin of Darlington integrated circuit (IC) 2 is connected to the SEG6 pin of LED display 31 respectively by a resistance correspondence, SEG7 pin, SEG8 pin, SEG9 pin, SEG10 pin, SEG11 pin, SEG12 pin, 5th electric capacity C5 is connected between the 8th pin of Darlington integrated circuit (IC) 2 and the 9th pin.
According to one embodiment of present invention, as shown in Figure 3, display 30 also comprises: the 3rd resistance R3, first triode Q1, 4th resistance R4, 5th resistance R5, second triode Q2, 6th resistance R6, 7th resistance R7, 3rd triode Q3 and the 8th resistance R8, one end of 3rd resistance R3 is connected with the COM1 pin of display 30, the base stage of the first triode Q1 is connected with the other end of the 3rd resistance R3, the collector of the first triode Q1 is connected with the COM1 pin of LED display 31, the emitter of the first triode Q1 is connected with default power supply VCC, between the base stage that 4th resistance R4 is connected to the first triode Q1 and emitter, one end of 5th resistance R5 is connected with the COM2 pin of display 30, the base stage of the second triode Q2 is connected with the other end of the 5th resistance R5, the collector of the second triode Q2 is connected with the COM2 pin of LED display 31, the emitter of the second triode Q2 is connected with default power supply VCC, between the base stage that 6th resistance R6 is connected to the second triode Q2 and emitter, one end of 7th resistance R7 is connected with the COM3 pin of display 30, the base stage of the 3rd triode Q3 is connected with the other end of the 7th resistance R7, the collector of the 3rd triode Q3 is connected with the COM3 pin of LED display 31, the emitter of the 3rd triode Q3 is connected with default power supply VCC, between the base stage that 8th resistance R8 is connected to the 3rd triode Q3 and emitter.
According to a concrete example of the present invention, as shown in Figure 5, the COM1 pin of controller 20, the COM1 pin of COM2 pin and COM2 pin and display 30, COM2 pin is connected with COM2 pin correspondence, the SEG6 pin of controller 20, SEG7 pin, SEG8 pin, SEG9 pin, SEG10 pin, SEG11 pin, the SEG6 pin of SEG12 pin and display 30, SEG7 pin, SEG8 pin, SEG9 pin, SEG10 pin, SEG11 pin, SEG12 pin correspondence is connected, controller 20 is after the temperature successfully obtaining temperature sensor to be measured, export corresponding signal to show to display 30 with the temperature making display 30 and treat testing temperature sensor.In addition, the peripheral circuit of the controller 20 shown in Fig. 5 mainly ensures that controller 20 can normal table work, is just not described in detail here.
Further, as shown in Figure 6, the course of work of controller 20 comprises the following steps:
S101, temperature detection starts.
S102, gathers the magnitude of voltage (repeatedly) of temperature sensor to be measured.The object of multi collect is to ensure the reliability detected.
S103, judges whether collection completes.If so, step S104 is performed; If not, this acquisition process process is terminated.
S104, data processing.
Briefly, controller 20 often gathers the magnitude of voltage of temperature sensor to be measured at regular intervals, and be converted to AD value to by the magnitude of voltage of temperature sensor to be measured, when the number of times gathered reaches preset times, controller 20 stops gathering and processing multiple AD value, to export the temperature of temperature sensor to be measured.
To sum up, failure detector for the temperature sensor of refrigerator is simple, reliable, can continuously uninterrupted all supplied materials temperature sensors are detected and the displays temperature that follows up to judge that whether temperature sensor normal, also whether precisely can be used to the pre-buried temperature sensor of on-line checkingi refrigerator, thus reach detection fast and judge that whether the temperature sensor of refrigerator is normal.
According to the failure detector of the temperature sensor for refrigerator of the embodiment of the present invention, temperature sensor to be measured is connected by detection terminal, in controller, AD converter is set, and prestore AD table, controller gathers the magnitude of voltage of temperature sensor to be measured by detecting pin, and convert the magnitude of voltage of temperature sensor to be measured to AD value by AD converter, and shown with the temperature obtaining temperature sensor to be measured by inquiry AD according to AD value, the temperature of display to the temperature sensor to be measured that controller obtains shows to judge whether temperature sensor to be measured breaks down, there is detection speed fast, accuracy of detection is high, result judges the advantages such as straightforward, effectively avoid being undertaken detecting brought detection speed by multimeter slow, the shortcomings such as accuracy of detection is low.
Fig. 7 is the process flow diagram of the fault detection method of the temperature sensor for refrigerator according to the embodiment of the present invention.As shown in Figure 7, this fault detection method being used for the temperature sensor of refrigerator comprises the following steps:
S1, treats testing temperature sensor by detection terminal and detects.
S2, gathers the magnitude of voltage of temperature sensor to be measured, and converts the magnitude of voltage of temperature sensor to be measured to AD value.
S3, shows with the temperature obtaining temperature sensor to be measured by inquiring about the AD prestored according to AD value.
S4, the temperature treating testing temperature sensor carries out showing to judge whether temperature sensor to be measured breaks down.
Particularly, because the resistance of temperature sensor can change along with the change of temperature, when the resistance of temperature sensor changes, the magnitude of voltage also respective change of temperature sensor to be measured.Because magnitude of voltage and temperature value have certain relation, therefore the magnitude of voltage of temperature sensor to be measured is being collected and after carrying out AD conversion, the temperature of temperature sensor to be measured can be obtained by inquiry AD table, then the temperature of the temperature sensor to be measured obtained is shown by display, so that testing staff is by judging the temperature data quality that judge temperature sensor whether consistent with actual temperature shown, effectively avoid the shortcomings such as the detection speed that brought by manual detection is slow, accuracy of detection is low.
Further, the magnitude of voltage of temperature sensor to be measured can be obtained by voltage detecting circuit shown in Fig. 1 or Fig. 5, if the resistance R of temperature sensor
nTCrepresent, then the magnitude of voltage of the detection pin reading of controller is as shown in above-mentioned formula (1).The magnitude of voltage of reading is converted to AD value by the AD converter in controller, and is shown with the temperature obtaining temperature sensor to be measured by inquiry AD according to AD value, is then undertaken showing to judge whether temperature sensor to be measured breaks down by the display shown in Fig. 3.In addition, as shown in Figure 6, can repeated detection temperature sensor to be measured magnitude of voltage with ensure detect reliability.
According to the fault detection method of the temperature sensor for refrigerator of the embodiment of the present invention, treat testing temperature sensor by detection terminal to detect, gather the magnitude of voltage of temperature sensor to be measured, and convert the magnitude of voltage of temperature sensor to be measured to AD value, show with the temperature obtaining temperature sensor to be measured by inquiring about the AD prestored according to AD value, and the temperature treating testing temperature sensor carries out showing to judge whether temperature sensor to be measured breaks down.Therefore, the fault detection method of the temperature sensor for refrigerator of the embodiment of the present invention has that detection speed is fast, accuracy of detection is high, result judges the advantages such as straightforward, effectively avoids being undertaken detecting the shortcomings such as brought detection speed is slow, accuracy of detection is low by multimeter.
Claims (8)
1. for a failure detector for the temperature sensor of refrigerator, it is characterized in that, comprising:
Detection terminal, the first end of described detection terminal is connected with the power supply of the first predeterminated voltage, and described detection terminal is for connecting temperature sensor to be measured;
Controller, the detection pin of described controller is connected with the second end of described detection terminal by the first resistance, in described controller, AD converter is set, and prestore AD table, described controller gathers the magnitude of voltage of described temperature sensor to be measured by described detection pin, and convert the magnitude of voltage of described temperature sensor to be measured to AD value by described AD converter, and show with the temperature obtaining described temperature sensor to be measured by inquiring about described AD according to described AD value;
Display, described display is connected with described controller, and the temperature of described display to the temperature sensor described to be measured that described controller obtains shows to judge whether described temperature sensor to be measured breaks down; And
Power module, described power module be connected with described display with described controller respectively with give described controller and described monitor power supply.
2., as claimed in claim 1 for the failure detector of the temperature sensor of refrigerator, it is characterized in that, the power supply of described first predeterminated voltage is provided by described power module.
3. as claimed in claim 1 for the failure detector of the temperature sensor of refrigerator, it is characterized in that, the second end of described detection terminal is also by the second resistance eutral grounding.
4., as claimed in claim 1 for the failure detector of the temperature sensor of refrigerator, it is characterized in that, described power module specifically comprises:
First electric capacity, one end of described first electric capacity is connected with the power supply of the second predeterminated voltage, the other end ground connection of described first electric capacity, and wherein, described second predeterminated voltage is greater than described first predeterminated voltage;
Second electric capacity, described second electric capacity and described first Capacitance parallel connection;
First electrochemical capacitor, described first electrochemical capacitor and described second Capacitance parallel connection, the positive terminal of described first electrochemical capacitor is connected with the power supply of described second predeterminated voltage, the negative pole end ground connection of described first electrochemical capacitor;
Voltage stabilizing chip, the input end of described voltage stabilizing chip is connected with the positive terminal of described first electrochemical capacitor, the ground end ground connection of described voltage stabilizing chip, and the default power supply of output terminal output of described voltage stabilizing chip is to give described controller and described monitor power supply respectively;
Also be parallel with the second electrochemical capacitor, the 3rd electric capacity and the 4th electric capacity between the output terminal of described voltage stabilizing chip and ground, wherein, the positive terminal of described second electrochemical capacitor is connected with the output terminal of described voltage stabilizing chip, the negative pole end ground connection of described second electrochemical capacitor.
5., as claimed in claim 1 for the failure detector of the temperature sensor of refrigerator, it is characterized in that, described display comprises LED display, the circuit of described LED display is made up of 21 light emitting diodes, the cells arranged in matrix that described 21 light emitting diodes arrange with 3 row 7, wherein
The negative electrode of 7 light emitting diodes in the first row respectively with SEG6 pin, SEG7 pin, SEG8 pin, SEG9 pin, SEG10 pin, the SEG11 pin of described LED display, SEG12 pin is corresponding is connected, the anode of 7 light emitting diodes in described the first row is all connected to the COM1 pin of described LED display;
The negative electrode of 7 light emitting diodes in the second row respectively with SEG6 pin, SEG7 pin, SEG8 pin, SEG9 pin, SEG10 pin, the SEG11 pin of described LED display, SEG12 pin is corresponding is connected, the anode of 7 light emitting diodes in described second row is all connected to the COM2 pin of described LED display;
The negative electrode of 7 light emitting diodes in the third line respectively with SEG6 pin, SEG7 pin, SEG8 pin, SEG9 pin, SEG10 pin, the SEG11 pin of described LED display, SEG12 pin is corresponding is connected, the anode of 7 light emitting diodes in described the third line is all connected to the COM3 pin of described LED display.
6., as claimed in claim 5 for the failure detector of the temperature sensor of refrigerator, it is characterized in that, described display also comprises:
Darlington integrated circuit, first to the 7th pin of described Darlington integrated circuit respectively with the SEG12 pin of described display, SEG11 pin, SEG10 pin, SEG9 pin, SEG8 pin, SEG7 pin, SEG6 pin correspondence is connected, 8th pin ground connection of described Darlington integrated circuit, 9th pin of described Darlington integrated circuit is connected with default power supply, ten to the ten six pin of described Darlington integrated circuit is connected to the SEG6 pin of described LED display respectively by a resistance correspondence, SEG7 pin, SEG8 pin, SEG9 pin, SEG10 pin, SEG11 pin, SEG12 pin,
5th electric capacity, described 5th electric capacity is connected between the 8th pin of described Darlington integrated circuit and the 9th pin.
7., as claimed in claim 5 for the failure detector of the temperature sensor of refrigerator, it is characterized in that, described display also comprises:
3rd resistance, described one end of 3rd resistance is connected with the COM1 pin of described display;
First triode, the base stage of described first triode is connected with the other end of described 3rd resistance, and the collector of described first triode is connected with the COM1 pin of described LED display, and the emitter of described first triode is connected with default power supply;
4th resistance, between the base stage that described 4th resistance is connected to described first triode and emitter;
5th resistance, described one end of 5th resistance is connected with the COM2 pin of described display;
Second triode, the base stage of described second triode is connected with the other end of described 5th resistance, and the collector of described second triode is connected with the COM2 pin of described LED display, and the emitter of described second triode is connected with default power supply;
6th resistance, between the base stage that described 6th resistance is connected to described second triode and emitter;
7th resistance, described one end of 7th resistance is connected with the COM3 pin of described display;
3rd triode, the base stage of described 3rd triode is connected with the other end of described 7th resistance, and the described collector of the 3rd triode is connected with the COM3 pin of described LED display, and the emitter of described 3rd triode is connected with default power supply;
8th resistance, between the base stage that described 8th resistance is connected to described 3rd triode and emitter.
8. for a fault detection method for the temperature sensor of refrigerator, it is characterized in that, comprise the following steps:
Treat testing temperature sensor by detection terminal to detect;
Gather the magnitude of voltage of described temperature sensor to be measured, and convert the magnitude of voltage of described temperature sensor to be measured to AD value;
Show with the temperature obtaining described temperature sensor to be measured by inquiring about the AD prestored according to described AD value; And
Show to judge whether described temperature sensor to be measured breaks down to the temperature of described temperature sensor to be measured.
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| CN117030066A (en) * | 2023-09-28 | 2023-11-10 | 孚创动力控制技术（启东）有限公司 | Constant temperature detection device for temperature sensor |
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Application publication date: 20151021 |