CN204679559U - A kind of negative tempperature coefficient thermistor circuit - Google Patents
A kind of negative tempperature coefficient thermistor circuit Download PDFInfo
- Publication number
- CN204679559U CN204679559U CN201520258774.4U CN201520258774U CN204679559U CN 204679559 U CN204679559 U CN 204679559U CN 201520258774 U CN201520258774 U CN 201520258774U CN 204679559 U CN204679559 U CN 204679559U
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- Prior art keywords
- division module
- coefficient thermistor
- tempperature coefficient
- negative tempperature
- mobile phone
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Abstract
The utility model relates to electronic technology field, discloses a kind of negative tempperature coefficient thermistor circuit, and this negative tempperature coefficient thermistor circuit comprises: power supply, mobile phone battery connector; Described power supply is connected with the battery detecting end of mobile phone battery connector; Described negative tempperature coefficient thermistor circuit, also comprises: division module, and described division module is connected with the battery detecting end of described power supply and mobile phone battery connector respectively.The utility model embodiment in terms of existing technologies, division module is added in negative tempperature coefficient thermistor circuit, the voltage of the battery detecting end of mobile phone battery connector is reduced because of the division module increased, the temperature value obtained by the voltage transitions of battery detecting end also reduces thereupon, thus the normal boot-strap remaining on (being namely no more than threshold value) and mobile phone in rational scope for this temperature value provides guarantee.
Description
Technical field
The utility model relates to electronic technology field, particularly a kind of negative tempperature coefficient thermistor circuit.
Background technology
Detect the presence or absence of battery, be the important step in cell phone mainboard test, in prior art, generally carried out the presence or absence of detection of handset battery by the BAT_ON pin of mobile phone battery connector.As shown in Figure 1, in testing process, if the voltage of BAT_ON pin is greater than 2.5V, the temperature of negative temperature coefficient (NegativeTemperature Coefficient, be called for short " NTC ") thermistor will exceed threshold value, causes mobile phone cannot normal boot-strap, this not only can have influence on the testing process of mobile phone, research staff also can be disturbed the judgement of problem, this problem uncertain is by the problem of software itself, or other problem causes.Now, research staff can only analyze by capturing effective log information.Obviously, by the too high situation about cannot start shooting caused of negative tempperature coefficient thermistor temperature, had influence on the efficiency of cell phone mainboard test.
Utility model content
The purpose of this utility model is to provide a kind of negative tempperature coefficient thermistor circuit, avoids the situation that mobile phone causes starting shooting because NTC thermistor temperature is too high, improves the efficiency of cell phone mainboard test.
For solving the problems of the technologies described above, embodiment of the present utility model provides a kind of negative tempperature coefficient thermistor circuit, comprises: power supply, mobile phone battery connector; Described power supply is connected with the battery detecting end of mobile phone battery connector; Described negative tempperature coefficient thermistor circuit, also comprises: division module, and described division module is connected with the battery detecting end of described power supply and mobile phone battery connector respectively.
The utility model embodiment in terms of existing technologies, division module is added in negative tempperature coefficient thermistor circuit, according to voltage divider principle, the voltage of the battery detecting end of mobile phone battery connector reduces, also reduced by the temperature value of the voltage transitions of battery detecting end, thus the normal boot-strap remaining on (being namely no more than threshold value) and mobile phone in rational scope for this temperature value provides guarantee thereupon.
Further, described negative tempperature coefficient thermistor circuit also comprises a resistance;
The first end of described resistance is connected with described power supply, the second end of described resistance respectively with being connected of the battery detecting end of described mobile phone battery connector and the first end of division module;
Second end ground connection of described division module.This resistance is conducive to the magnitude of voltage of the battery detecting end reducing mobile phone battery connector further.
Further, described negative tempperature coefficient thermistor circuit also comprises diode;
Second end of described division module is by described diode ground connection; Wherein, the negative electrode of described diode is connected with the second end of described division module, the plus earth of described diode.This diode is conducive to filtering clutter.
Further, described negative tempperature coefficient thermistor circuit also comprises diode;
Described diode and described division module are in parallel; Wherein, the negative electrode of described diode is connected with the first end of described division module, and the anode of described diode is connected with the second end of described division module.
Further, described diode is transient voltage suppressor.Transient voltage suppressor can make its impedance suddenly reduce with high speed, simultaneously stability big current is numerically predetermined at one by the voltage clamp between its two ends, is conducive to guaranteeing that circuit component below damages from the high-octane impact of transient state.
Further, described division module is adjustable potentiometer.The resistance in the place in circuit of this adjustable potentiometer can be regulated according to actual needs, be conducive to increasing the scope of application of the present utility model.
Further, described division module is resistance.
Further, the resistance of described division module is less than or equal to 100k ohm.
Accompanying drawing explanation
Fig. 1 is the structural representation of the negative tempperature coefficient thermistor circuit according to prior art;
Fig. 2 is the structural representation of a kind of negative tempperature coefficient thermistor circuit according to the utility model first embodiment;
Fig. 3 is the structural representation of a kind of negative tempperature coefficient thermistor circuit according to the utility model second embodiment;
Fig. 4 is the structural representation of a kind of negative tempperature coefficient thermistor circuit according to the utility model the 3rd embodiment.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly, below in conjunction with accompanying drawing, each embodiment of the present utility model is explained in detail.But, persons of ordinary skill in the art may appreciate that in each embodiment of the utility model, proposing many ins and outs to make reader understand the application better.But, even without these ins and outs with based on the many variations of following embodiment and amendment, each claim of the application technical scheme required for protection also can be realized.
First embodiment of the present utility model relates to a kind of negative tempperature coefficient thermistor circuit, as shown in Figure 2, this negative tempperature coefficient thermistor circuit, comprises power supply V, mobile phone battery connector, resistance R1, R2, R3, R4, transient voltage suppressor TVS1, TVS2, electric capacity C1, C2 and division module.
Specifically, the output terminal of power supply V is connected with the battery detecting end of mobile phone battery connector and the first end of division module respectively by resistance R4, and the second end of division module is by TVS1 ground connection; Wherein, the negative electrode of TVS1 is connected with the second end of division module, the plus earth of TVS1.
TVS2 and electric capacity C1 and C2 is in parallel, form parallel circuit, the positive pole VBAT of the battery that one end of this parallel circuit is connected with mobile phone battery connector and mobile phone battery connector is respectively connected, the other end of this parallel circuit is connected with test point P (CS_P namely in Fig. 2) by resistance R1, be connected with test point N (CS_N namely in Fig. 2) by resistance R2, R3, wherein, test point P flows through the electric current of resistance R1 for detecting, test point N flows through the electric current of resistance R2 for detecting.
In the present embodiment, mobile phone battery connector is for connecting the battery of mobile phone, and the battery detecting end of mobile phone battery connector is served as by the pin BAT_ON of mobile phone battery connector, and whether this battery detecting end is used for battery exists.Power supply V is the power supply provided by the power management module (not shown) of cell phone mainboard, and its size is 2.8V.TVS1, TVS2 in circuit are used for electrostatic prevention and surge, and electric capacity C1, C2 are used for filtering clutter.
In general, if battery exists, battery has an internal resistance (present embodiment for this internal resistance for 47k ohm is described), the voltage that now the battery detecting end (i.e. pin BAT_ON) of mobile phone battery connector is got from power supply V is less than the threshold voltage of this point (in the present embodiment, this threshold voltage is 2.5V), now, in the reasonable scope, the temperature value that the voltage transitions of battery detecting end obtains in the reasonable scope for the temperature value obtained by the voltage transitions of battery detecting end
If battery does not exist, namely the internal resistance of battery does not exist, but due to the existence of division module, according to electric resistance partial pressure principle, the resistance of suitable selection division module, the voltage of battery detecting end still can be made to be less than the threshold voltage of this point, thus the temperature value making the voltage transitions of battery detecting end obtain is in the non-existent situation of battery, still keep in the reasonable scope, after connecting direct supply (this direct supply is positioned at the both positive and negative polarity junction of primary element on cell phone mainboard), mobile phone normal boot-strap can be made.
It should be noted that, present embodiment for this division module for adjustable potentiometer is described, with adjustable potentiometer as division module, make researchist can according to the size of the internal resistance of cell, regulate the resistance in the place in circuit of this potentiometer, simultaneously in order to increase the scope of application of the present utility model, the maximum value of the adjustable potentiometer that present embodiment is selected is 100k ohm.
Be not difficult to find, present embodiment, by increasing division module in negative tempperature coefficient thermistor circuit, make when battery of mobile phone does not exist, the voltage of the battery detecting end of mobile phone battery connector is reduced by this division module, thus the temperature value that reduction is obtained by the voltage transitions of battery detecting end, make this temperature value remain in rational scope, and then ensure that mobile phone is not when having battery, mobile phone normal boot-strap can be made by connecting direct supply.
In actual applications, also can by the mode of amendment software, the temperature value that the voltage transitions of battery detecting end is obtained, in the non-existent situation of battery, still keeps in the reasonable scope.Such as, when can't detect battery, after the magnitude of voltage of battery detecting end (i.e. pin BAT_ON) is converted to temperature value, can forces to allow temperature value return the normal temperature of one 25 degree, thus ensure the normal boot-strap of mobile phone.
The utility model second embodiment relates to a kind of negative tempperature coefficient thermistor circuit.Second embodiment is roughly the same with the first embodiment, and key distinction part is: in the first embodiment, and this division module is adjustable potentiometer.And in the utility model second embodiment, this division module also can be the resistance (as shown in Figure 3, wherein R5 is the division module of present embodiment) that one or more resistance is fixed.
Generally speaking, for the mobile phone of same type, the internal resistance of its battery is fixing, therefore, present embodiment can determine the resistance of division module according to the internal resistance of battery, again according to the resistance that the resistance after determining selects one or more resistance (when selecting multiple resistance, by the mode of resistant series or parallel connection, the resistance of the division module after ensureing the resistance of the all-in resistance obtained and determining is identical) to fix.
3rd embodiment of the present utility model relates to a kind of NTC circuit.3rd embodiment is roughly the same with the first embodiment, and key distinction part is: in the first embodiment, and division module and TVS1 are in series.And in the utility model the 3rd embodiment, division module and TVS1 are in parallel, as shown in Figure 4.Take division module as adjustable potentiometer for example is described, wherein, the negative electrode of this TVS1 is connected with the first end of adjustable potentiometer; The anode of TVS1 is connected with the second end of adjustable potentiometer.
Persons of ordinary skill in the art may appreciate that the respective embodiments described above realize specific embodiment of the utility model, and in actual applications, various change can be done to it in the form and details, and do not depart from spirit and scope of the present utility model.
Claims (8)
1. a negative tempperature coefficient thermistor circuit, comprises power supply, mobile phone battery connector; Described power supply is connected with the battery detecting end of mobile phone battery connector; It is characterized in that, also comprise division module, described division module is connected with the battery detecting end of described power supply and mobile phone battery connector respectively.
2. negative tempperature coefficient thermistor circuit according to claim 1, is characterized in that, described negative tempperature coefficient thermistor circuit also comprises a resistance;
The first end of described resistance is connected with described power supply, the second end of described resistance respectively with being connected of the battery detecting end of described mobile phone battery connector and the first end of division module;
Second end ground connection of described division module.
3. negative tempperature coefficient thermistor circuit according to claim 2, is characterized in that, described negative tempperature coefficient thermistor circuit also comprises diode;
Second end of described division module is by described diode ground connection; Wherein, the negative electrode of described diode is connected with the second end of described division module, the plus earth of described diode.
4. negative tempperature coefficient thermistor circuit according to claim 2, is characterized in that, described negative tempperature coefficient thermistor circuit also comprises diode;
Described diode and described division module are in parallel; Wherein, the negative electrode of described diode is connected with the first end of described division module, and the anode of described diode is connected with the second end of described division module.
5. the negative tempperature coefficient thermistor circuit according to claim 3 or 4, is characterized in that, described diode is transient voltage suppressor.
6. negative tempperature coefficient thermistor circuit according to claim 1, is characterized in that, described division module is adjustable potentiometer.
7. negative tempperature coefficient thermistor circuit according to claim 1, is characterized in that, described division module is resistance.
8. negative tempperature coefficient thermistor circuit according to claim 1, is characterized in that, the resistance of described division module is less than or equal to 100k ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520258774.4U CN204679559U (en) | 2015-04-24 | 2015-04-24 | A kind of negative tempperature coefficient thermistor circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520258774.4U CN204679559U (en) | 2015-04-24 | 2015-04-24 | A kind of negative tempperature coefficient thermistor circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204679559U true CN204679559U (en) | 2015-09-30 |
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| CN201520258774.4U Expired - Fee Related CN204679559U (en) | 2015-04-24 | 2015-04-24 | A kind of negative tempperature coefficient thermistor circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111432069A (en) * | 2020-03-12 | 2020-07-17 | Oppo广东移动通信有限公司 | Starting control method and device of terminal equipment and related equipment |
-
2015
- 2015-04-24 CN CN201520258774.4U patent/CN204679559U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111432069A (en) * | 2020-03-12 | 2020-07-17 | Oppo广东移动通信有限公司 | Starting control method and device of terminal equipment and related equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150930 Termination date: 20200424 |