CN104198864A - Method and device for testing reliability of PTC (positive temperature coefficient) resistor - Google Patents
Method and device for testing reliability of PTC (positive temperature coefficient) resistor Download PDFInfo
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- CN104198864A CN104198864A CN201410484246.0A CN201410484246A CN104198864A CN 104198864 A CN104198864 A CN 104198864A CN 201410484246 A CN201410484246 A CN 201410484246A CN 104198864 A CN104198864 A CN 104198864A
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Abstract
The invention discloses a method and a device for testing reliability of a PTC (positive temperature coefficient) resistor. The device comprises a test power supply unit, a control unit and a data acquisition unit, wherein the test power supply unit provides a strong-current test voltage for the PTC resistor in a tested device; the control unit is electrically connected with the test power supply unit and controls connection and disconnection between the strong-current test voltage and the PCT resistor; the data acquisition unit is electrically connected with the control unit and used for acquiring on-off times of the strong-current test voltage and test characteristic parameters of the PCT resistor during testing. The method and the device for testing reliability of the PTC resistor have the advantages that the PTC resistor can be tested safely, efficiently and comprehensively, and reliability of the PTC resistor can be evaluated accurately by recording and contrastively analyzing the characteristic parameters including resistance, temperature, current and the like of the PTC resistor at stages before and after the strong-current test voltage is provided and subjecting a tested communication circuit to failure analysis.
Description
Technical field
The present invention relates to PTC resistance detection technical field, relate in particular to a kind of verifying attachment and method of PTC resistance reliability.
Background technology
Very large semiconductor material or the components and parts of PTC (Positive Temperature Coefficient: positive temperature coefficient) general reference positive temperature coefficient (PTC), conventionally the PTC that we mention refers to posistor, is called for short PTC thermistor or PCT resistance.PTC resistance is the semiconductor resistor that a kind of typical case has temperature sensitivity, and while exceeding certain temperature (Curie temperature), its resistance value is along with the rising of temperature is increasing of step evolution, is generally used for protection equipment and is applied in the scene of abnormally high-voltage.For example, burn out communicating circuit in order to solve connection wrong forceful electric power, need to protect at two PTC resistance of connection AB line serial connection.In order to introduce new PTC resistance, need to be to the analysis of testing of PTC resistance reliability.To PTC certificate authenticity method be at present: manually power-off powers on, and forceful electric power is received on PTC resistance.When after PTC energising a period of time, then disconnect resistance, temperature, the damaged condition of forceful electric power to PTC and carry out record.Again the communicating circuit of serial connection is carried out to damaged condition analysis.This mode shortcoming is: manual operation forceful electric power exists certain danger, and efficiency is low and comprehensive not to PTC Performance Detection.
Summary of the invention
In view of this, the problem that the present invention will solve is to provide the verifying attachment of PTC resistance reliability, carries out forceful electric power test PCT resistance collecting test characteristic parameter.
A verifying attachment for PTC resistance reliability, comprising: detect power supply unit, provide forceful electric power test voltage for the PTC resistance to tested device; Control module, is electrically connected with described detection power supply unit, for controlling connection, the disconnection of described forceful electric power test voltage and described PCT resistance; Data acquisition unit, is electrically connected with described control module, for the test feature parameter of described PCT resistance and the break-make number of times of described forceful electric power test voltage of acquisition testing.
According to one embodiment of present invention, further, also comprise: timing unit, is electrically connected with described control module, for sending energising, power-off signal according to the time of default energising, power-off to described control module; Described control module is switched on or switched off according to forceful electric power test voltage described in described energising, power-off signal control.
According to one embodiment of present invention, further, also comprise: analytic unit, is electrically connected with described data acquisition unit, for the reliability of described PTC resistance being analyzed according to the break-make number of times of described characteristic parameter and described forceful electric power test voltage.
According to one embodiment of present invention, further, also comprise: display device, is electrically connected with described data acquisition unit and described analytic unit respectively, for showing the test feature parameter of described PCT resistance and the reliable rows analysis result of described PTC resistance.
According to one embodiment of present invention, further, also comprise: current sensor, for detection of passing through the current value of described PTC resistance; Temperature sensor, for detection of described PTC resistive surface temperature; Resistor detecting device, for detection of the resistance value of described PTC resistance after power-off; Described data acquisition unit is electrically connected with described current sensor, described temperature sensor and described resistor detecting device respectively.
According to one embodiment of present invention, further, rise and reach while stablizing when described control module judges the surface temperature of described PTC resistance, controlling described measuring current disconnects, and when described control module judge described PTC surface temperature temperature decline and reach stable after, control described test voltage and again connect.
According to one embodiment of present invention, further, described tested device comprises communication interface, the described PTC resistance of connecting respectively on the A of described communication interface line and B line.
According to one embodiment of present invention, further, also comprise: second communication module, be electrically connected with described control module, for returning to after normal temperature in the temperature of described forceful electric power test voltage disconnection and described PTC resistance, send test massage to described communication interface, and receive the signal that described communication interface is returned; The signal that described control module returns according to described communication interface judges whether described tested device breaks down.
According to one embodiment of present invention, further, first communication module, is electrically connected with described data acquisition unit, in real time the test feature parameter of described PCT resistance being sent to outside data storage device.
According to one embodiment of present invention, further, the test feature parameter of described PCT resistance comprises: by the resistance value of described PTC resistance after the current value of described PTC resistance, described PTC resistive surface temperature, power-off.
The problem that the present invention will solve is to provide the method for inspection of PTC resistance reliability, carries out forceful electric power test PCT resistance collecting test characteristic parameter.
A method of inspection for PTC resistance reliability, comprising: provide forceful electric power test voltage to the PTC resistance in tested device; Control connection, the disconnection of described forceful electric power test voltage and described PCT resistance; The test feature parameter of the described PCT resistance in acquisition testing and the break-make number of times of described forceful electric power test voltage.
According to one embodiment of present invention, further, according to the break-make number of times of described characteristic parameter and described forceful electric power test voltage, the reliability of described PTC resistance is analyzed; Show the test feature parameter of described PCT resistance and the reliable rows analysis result of described PTC resistance.
According to one embodiment of present invention, further, when judge after the connection of test voltage repeatedly, disconnection, the variation of described PTC resistance resistance value at normal temperatures in default change threshold time, judges that described PCT resistance is reliable.
According to one embodiment of present invention, further, when judging that the surface temperature of described PTC resistance rises and reaches while stablizing, controls described forceful electric power test voltage and disconnects, and when judge described PTC surface temperature temperature decline and reach stable after, control described test voltage and again connect; Or, control described forceful electric power test voltage according to the time of default energising, power-off and be switched on or switched off.
According to one embodiment of present invention, further, described tested device comprises communication interface, the described PTC resistance of connecting respectively on the A of described communication interface line and B line.
According to one embodiment of present invention, further, return to after normal temperature in the temperature of described forceful electric power test voltage disconnection and described PTC resistance, send test massage to described communication interface, and receive the signal that described communication interface is returned; The signal returning according to described communication interface judges whether described tested device breaks down.
According to one embodiment of present invention, further, the test feature parameter of described PCT resistance is sent to outside data storage device in real time.
According to one embodiment of present invention, further, the test feature parameter of described PCT resistance comprises: by the resistance value of described PTC resistance after the current value of described PTC resistance, described PTC resistive surface temperature, power-off.
The verifying attachment of PTC resistance reliability of the present invention and method, can carry out forceful electric power detect PCT resistance and in real time to the characteristic parameters such as the PTC resistance in logical forward and backward each stage of forceful electric power, temperature, electric current record, comparative analysis, tested communicating circuit is carried out to Failure analysis simultaneously, exactly the reliable rows of PTC resistance is assessed.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the present invention's design to be suitable for the various embodiment with various amendments of special-purpose.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is according to the schematic diagram of the verifying attachment of PTC resistance reliability of the present invention embodiment;
Fig. 2 is according to the process flow diagram of the method for inspection of PTC resistance reliability of the present invention embodiment.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention is wherein described.Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, the invention provides a kind of verifying attachment of PTC resistance reliability, comprising: detect power supply unit 11, control module 12 and data acquisition unit 16.Control module 12 is electrically connected with detection power supply unit 11, data acquisition unit 13 respectively.
Detect power supply unit 11 and provide forceful electric power test voltage to the PTC resistance in tested device, control module 12 is controlled connection, the disconnection of forceful electric power test voltage and PCT resistance, the test feature parameter of the PCT resistance in data acquisition unit 16 acquisition testing.Can carry out forceful electric power test PCT resistance and in real time the characteristic parameters such as the PTC resistance in logical forward and backward each stage of forceful electric power, temperature, electric current be carried out to record.
Forceful electric power is for light current, and forceful electric power and light current are with voltage boundary, and operating voltage is forceful electric power more than alternating current 220V, is below light current.Forceful electric power generally also refers to that DC voltage is more than 24V.As electric light, socket etc. in family, voltage is at 110～220V, and the electrical appliances such as lighting, refrigerator, televisor, stereo set (input end) are heavy current installation.Light current refers generally to DC circuit or audio frequency, video line, network line, telephone line, and DC voltage is generally in 24V.
In one embodiment, analytic unit 13 carries out analysis and assessment, assessment according to characteristic parameter to the reliability of PTC resistance.Display device 14 is electrically connected with data acquisition unit 16 and assessment unit 13 respectively, can show in real time the test feature parameter of PCT resistance and the reliable rows analysis result of PTC resistance.The test feature parameter of PCT resistance comprises: resistance value, the break-make number of times of forceful electric power test voltage etc. of PTC resistance after current value by PTC resistance, PTC resistive surface temperature, power-off.
In one embodiment, current sensor detects by the current value of PTC resistance, and temperature sensor detects PTC resistive surface temperature, the resistance value of PTC resistance after resistor detecting device detection power-off.Data acquisition unit 16 is electrically connected with current sensor, temperature sensor and resistor detecting device (not shown in FIG.) respectively.
In one embodiment, the verifying attachment of PTC resistance reliability can have two kinds of detecting patterns: temperature model and timing mode.Temperature model: control module 12 can obtain detection information from data acquisition unit 16, rise and reach while stablizing when control module 12 judges the surface temperature of PTC resistance, control measuring current disconnects, and when control module judge PTC surface temperature temperature decline and reach stable after, control test voltage and again connect.For example, when after forceful electric power on PTC resistance, just disconnect forceful electric power if monitored in 1min after the temperature rise of PTC resistive surface is stablized, disconnect after forceful electric power, in 1min, monitor the logical above forceful electric power of the stable rear continuation of temperature decline.
Timing mode: timing unit 15 is set, and timing unit 15 is electrically connected with control module 12, sends energising, power-off signal to control module 12 according to the time of default energising, power-off.Control module 12 is switched on or switched off according to energising, power-off signal control forceful electric power test voltage.By different patterns is set, can simulate severe situation according to concrete test request, PTC resistance is comprehensively assessed.
Control module 12 can select different control models control forceful electric power test voltage conducting and trip time interval, can detect in real time, efficiently PTC surface temperature, by the electric current of PTC, disconnect the resistance that can detect in real time PTC after forceful electric power.Analytic unit 13 is analyzed the reliability of PTC resistance by parameter.
In one embodiment, first communication module is electrically connected with data acquisition unit 16, in real time the test feature parameter of PCT resistance is sent to outside data storage device, according to concrete design, first communication module can be selected obstructed communication module, for example wifi module, UART serial port module etc., communicate by letter with outside data storage device, for example, first communication module is serial port module UART1, the PTC device surface temperature in real time data acquisition unit 16 being gathered by UART1, by PTC electric current, the resistance value of PTC after power-off, the parameters such as energising power-off number of times send to PC, these parameters are passed through to database mode real-time storage on PC.Parameter in test can be sent to outside memory device stores, to preserve for a long time detecting information and can further analyze data.
In one embodiment, the verifying attachment of PTC resistance reliability can detect the PTC resistance in plurality of devices.For example, equipment under test is mainboard, comprises RS-485 communication interface, the PTC resistance of connecting respectively on the A of RS-485 communication interface line and B line, and PTC1 and PTC2, directly receive the other two ends of PTC on zero live wire of forceful electric power test voltage.Control module 12 can be with tested mainboard communication in the situation that disconnecting forceful electric power test voltage, and receive the signal that RS-485 communication interface is returned, inspection communicating circuit carries out damaged condition, by checking the damaged condition of 485 damaged condition and PTC itself to assess the reliability of PTC.
Two UART communication modules are set; one is for following PC communication, and another is for tested device communication, returns to after normal temperature value when disconnecting forceful electric power PTC resistance; device is just with tested mainboard communication, if there is communication failure to judge that PTC resistance cannot be to the effect of late-class circuit unprotect.
In one embodiment, detect power supply unit 11 and comprise double-gate relay, double-gate relay can be by forceful electric power test voltage and second communication unit, and separately, without manual operation, security is improved the low-voltage of the signal of communication that UART0 sends.
Assessment PTC resistance reliably has multiple criterion, for example, through hundreds of break-make forceful electric power or connect for a long time after forceful electric power, available normal temperature resistance value assessment, if repeatedly break-make is brought up the rear, normal temperature resistance value does not have much variations, illustrates that resistance is reliable, if had a greater change, prove that resistance can not bear this severe situation.When energising, PTC both end voltage stabilization time and downslope time are also judgment criterion simultaneously: if voltage settling time and downslope time are long, all can damage late-class circuit, prove that PTC resistance can not satisfy the demands.Or, disconnect the tested mainboard communication of heel at every turn, if the communicating circuit of tested mainboard is damaged, prove that PTC can not satisfy the demands.
The verifying attachment of the PTC resistance reliability in above-described embodiment, can to PTC resistance carry out safe, efficiently, comprehensively inspection, by real-time PTC is led to, the characteristic parameters such as the forceful electric power resistance in each stage of front and back, temperature, electric current record, comparative analysis, tested communicating circuit is carried out to Failure analysis simultaneously, exactly the reliable rows of PTC resistance is assessed.
Fig. 2 is according to the process flow diagram of the method for inspection of PTC resistance reliability of the present invention embodiment, as shown in Figure 2:
Step 201, provides forceful electric power test voltage to the PTC resistance in tested device.
Step 202, controls connection, the disconnection of forceful electric power test voltage and PCT resistance.
Step 203, the test feature parameter of PCT resistance and the break-make number of times of forceful electric power test voltage in acquisition testing.
The characteristic parameter such as resistance, temperature, electric current that can be in real time the logical forceful electric power of PTC be detected to forward and backward each stage of voltage gathers, record.
In one embodiment, according to the break-make number of times of characteristic parameter and forceful electric power test voltage, the reliability of PTC resistance is analyzed, and show the test feature parameter of PCT resistance and the reliable rows assessment result of PTC resistance, can show in real time the test feature parameter of PCT resistance and the reliable rows analysis result of PTC resistance.The test feature parameter of PCT resistance comprises: resistance value, the break-make number of times of forceful electric power test voltage etc. of PTC resistance after current value by PTC resistance, PTC resistive surface temperature, power-off.
In one embodiment, when judging that the surface temperature of PTC resistance rises and reaches while stablizing, control measuring current and disconnect, and after judge that PTC surface temperature temperature declines and reaches and stablize, control test voltage is connected again; Or, control forceful electric power test voltage according to the time of default energising, power-off and be switched on or switched off.By obstructed pattern is set, can simulate severe situation according to concrete test request, PTC resistance is comprehensively assessed.
In one embodiment, the test feature parameter of PCT resistance is sent to outside data storage device in real time.Tested device comprises RS-485 communication interface, the PTC resistance of connecting respectively on the A of RS-485 communication interface line and B line.
In one embodiment, return to after normal temperature in the temperature of the disconnection of forceful electric power test voltage and PTC resistance, send test massage to RS-485 communication interface, and receive the signal that RS-485 communication interface is returned; The signal returning according to RS-485 communication interface judges whether tested device breaks down.Can be by checking the damaged condition of 485 damaged condition and PTC itself to assess the reliability of PTC.
In one embodiment, when judging after the connection of test voltage repeatedly, disconnecting, the variation of PTC resistance resistance value at normal temperatures in default change threshold time, judges that PCT resistance is reliable.
By verifying attachment and the method for PTC resistance reliability provided by the invention, can to PTC resistance carry out safe, efficiently, comprehensively inspection, by real-time, the characteristic parameters such as the PTC resistance in logical forward and backward each stage of forceful electric power test voltage, temperature, electric current are carried out to Record Comparison analysis, to tested communicating circuit Failure analysis, accurately the reliable rows of PTC resistance is assessed simultaneously.
May realize in many ways method and system of the present invention.For example, can realize method and system of the present invention by any combination of software, hardware, firmware or software, hardware, firmware.The said sequence that is used for the step of method is only in order to describe, and the step of method of the present invention is not limited to above specifically described order, unless otherwise specified.In addition, in certain embodiments, can be also the program being recorded in recording medium by the invention process, these programs comprise the machine readable instructions for realizing the method according to this invention.Thereby the present invention also covers the recording medium of storing the program for carrying out the method according to this invention.
Claims (18)
1. a verifying attachment for PTC resistance reliability, is characterized in that, comprising:
Detect power supply unit, provide forceful electric power test voltage for the PTC resistance to tested device;
Control module, is electrically connected with described detection power supply unit, for controlling connection, the disconnection of described forceful electric power test voltage and described PCT resistance;
Data acquisition unit, is electrically connected with described control module, for the break-make number of times of test feature parameter and the described forceful electric power test voltage of the resistance of PCT described in acquisition testing.
2. verifying attachment as claimed in claim 1, is characterized in that, also comprises:
Timing unit, is electrically connected with described control module, for sending energising, power-off signal according to the time of default energising, power-off to described control module;
Described control module is switched on or switched off according to forceful electric power test voltage described in described energising, power-off signal control.
3. verifying attachment as claimed in claim 1 or 2, is characterized in that, also comprises:
Analytic unit, is electrically connected with described data acquisition unit, for the reliability of described PTC resistance being analyzed according to the break-make number of times of described characteristic parameter and described forceful electric power test voltage.
4. verifying attachment as claimed in claim 1 or 2, is characterized in that, also comprises:
Display device, is electrically connected with described data acquisition unit and described analytic unit respectively, for showing the test feature parameter of described PCT resistance and the reliable rows analysis result of described PTC resistance.
5. verifying attachment as claimed in claim 1, is characterized in that, also comprises:
Current sensor, for detection of passing through the current value of described PTC resistance;
Temperature sensor, for detection of described PTC resistive surface temperature;
Resistor detecting device, for detection of the resistance value of described PTC resistance after power-off;
Described data acquisition unit is electrically connected with described current sensor, described temperature sensor and described resistor detecting device respectively.
6. verifying attachment as claimed in claim 1, is characterized in that:
Rise and reach while stablizing when described control module judges the surface temperature of described PTC resistance, controlling described measuring current disconnects, and when described control module judge described PTC surface temperature temperature decline and reach stable after, control described test voltage and again connect.
7. verifying attachment as claimed in claim 1, is characterized in that:
Described tested device comprises communication interface, the described PTC resistance of connecting respectively on the A of described communication interface line and B line.
8. verifying attachment as claimed in claim 7, is characterized in that, also comprises:
Second communication module, is electrically connected with described control module, for returning to after normal temperature in the temperature of described forceful electric power test voltage disconnection and described PTC resistance, sends test massage, and receive the signal that described communication interface is returned to described communication interface;
The signal that described control module returns according to described communication interface judges whether described tested device breaks down.
9. verifying attachment as claimed in claim 1, is characterized in that, also comprises:
First communication module, is electrically connected with described data acquisition unit, in real time the test feature parameter of described PCT resistance being sent to outside data storage device.
10. verifying attachment as claimed in claim 1, is characterized in that:
The test feature parameter of described PCT resistance comprises: by the resistance value of described PTC resistance after the current value of described PTC resistance, described PTC resistive surface temperature, power-off.
The method of inspection of 11. 1 kinds of PTC resistance reliability, is characterized in that, comprising:
Provide forceful electric power test voltage to the PTC resistance in tested device;
Control connection, the disconnection of described forceful electric power test voltage and described PCT resistance;
The test feature parameter of the resistance of PCT described in acquisition testing and the break-make number of times of described forceful electric power test voltage.
12. methods of inspection as claimed in claim 11, is characterized in that:
According to the break-make number of times of described characteristic parameter and described forceful electric power test voltage, the reliability of described PTC resistance is analyzed;
Show the test feature parameter of described PCT resistance and the reliable rows analysis result of described PTC resistance.
13. methods of inspection as claimed in claim 12, is characterized in that:
Fail-safe analysis criterion comprises: when judging after the connection of test voltage repeatedly, disconnecting, the variation of described PTC resistance resistance value at normal temperatures in default change threshold time, judges that described PCT resistance is reliable.
14. methods of inspection as claimed in claim 11, is characterized in that:
When judging that the surface temperature of described PTC resistance rises and reaches while stablizing, control described forceful electric power test voltage and disconnect, and after judging that described PTC surface temperature temperature declines and reaches and stablize, control described test voltage and again connect; Or,
Controlling described forceful electric power test voltage according to the time of default energising, power-off is switched on or switched off.
15. methods of inspection as claimed in claim 11, is characterized in that:
Described tested device comprises communication interface, the described PTC resistance of connecting respectively on the A of described communication interface line and B line.
16. methods of inspection as claimed in claim 15, is characterized in that:
Temperature at described forceful electric power test voltage disconnection and described PTC resistance returns to after normal temperature, sends test massage, and receive the signal that described communication interface is returned to described communication interface;
The signal returning according to described communication interface judges whether described tested device breaks down.
17. methods of inspection as claimed in claim 11, is characterized in that:
The test feature parameter of described PCT resistance is sent to outside data storage device in real time.
18. methods of inspection as claimed in claim 11, is characterized in that:
The test feature parameter of described PCT resistance comprises: by the resistance value of described PTC resistance after the current value of described PTC resistance, described PTC resistive surface temperature, power-off.
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| CN201410484246.0A CN104198864B (en) | 2014-09-19 | 2014-09-19 | The verifying attachment and method of a kind of PTC resistance reliabilities |
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| CN201410484246.0A CN104198864B (en) | 2014-09-19 | 2014-09-19 | The verifying attachment and method of a kind of PTC resistance reliabilities |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031707A (en) * | 2019-05-05 | 2019-07-19 | 宁波美康盛德生物科技有限公司 | The RTA reliability test assembly and test method of NTC thermistor |
| CN111537777A (en) * | 2020-04-13 | 2020-08-14 | 深圳欣旺达智能科技有限公司 | Automatic testing method and device for thermistor failure current |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2622938Y (en) * | 2003-06-05 | 2004-06-30 | 邬益飞 | High voltage preventive protector for communication line |
| CN202870185U (en) * | 2012-05-22 | 2013-04-10 | 长沙亿旭机电科技有限公司 | PTC thermistor comprehensive parameter testing device |
| CN204203374U (en) * | 2014-09-19 | 2015-03-11 | 珠海格力电器股份有限公司 | A kind of verifying attachment of PTC resistance reliability |
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2014
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110031707A (en) * | 2019-05-05 | 2019-07-19 | 宁波美康盛德生物科技有限公司 | The RTA reliability test assembly and test method of NTC thermistor |
| CN110031707B (en) * | 2019-05-05 | 2022-03-08 | 宁波美康盛德生物科技有限公司 | Reliability testing device and method for NTC thermistor |
| CN111537777A (en) * | 2020-04-13 | 2020-08-14 | 深圳欣旺达智能科技有限公司 | Automatic testing method and device for thermistor failure current |
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