CN204810367U - Cell -phone LCD screen temperature monitoring circuit - Google Patents
Cell -phone LCD screen temperature monitoring circuit Download PDFInfo
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- CN204810367U CN204810367U CN201520551406.9U CN201520551406U CN204810367U CN 204810367 U CN204810367 U CN 204810367U CN 201520551406 U CN201520551406 U CN 201520551406U CN 204810367 U CN204810367 U CN 204810367U
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Abstract
The utility model relates to a cell -phone LCD screen temperature monitoring circuit, including power reference circuit and temperature measurement circuit, power reference circuit and temperature measurement circuit connection, the power reference circuit includes an integrated circuit, first resistance, second resistance, a zener diode and a controlling resistor, an integrated circuit's model is MC1403, an integrated circuit's the external 12V DC voltage power of first end, not an integrated circuit's third termination ground, an integrated circuit's second end is connected with first resistance, a controlling resistor and the 2nd resistors's current circuit, not a controlling resistor's adjustable termination ground, this cell -phone LCD screen temperature monitoring circuit has not only reduced manufacturing cost through adopting the characteristics that the temperature sensor PT1 price is low, the accuracy is high, has still guaranteed measurement accuracy, and the high accurate stabilized voltage characteristic through the power reference circuit, further guaranteed temperature measurement's accuracy nature.
Description
Technical field
The utility model relates to a kind of mobile phone liquid crystal screen temperature observation circuit.
Background technology
Along with the development of science and technology and the progress of society, mobile phone is more and more universal.Along with people to mobile phone application increase, mobile phone in application process produced problem also along with increasing.
In the middle of mobile phone application, often because the high load capacity work of mobile phone, cause mobile phone screen overheated, experience to the mobile phone of user and bring very large impact.And present mobile phone development business is not very well for the temperature protection of mobile phone screen, often there will be the power consumption because mobile phone screen is overheated too fast.
Utility model content
The technical problems to be solved in the utility model is: the deficiency lacking temperature-monitoring function in order to overcome prior art, and not only design cost is low to provide one, and measures accurate mobile phone liquid crystal screen temperature observation circuit.
The utility model solves the technical scheme that its technical problem adopts: a kind of mobile phone liquid crystal screen temperature observation circuit, comprise power reference circuit and temperature measuring circuit, described power reference circuit is connected with temperature measuring circuit, described power reference circuit comprises the first integrated circuit, first resistance, second resistance, first voltage stabilizing didoe and the first adjustable resistance, the model of described first integrated circuit is MC1403, the external 12V DC voltage power supply of first end of described first integrated circuit, 3rd end ground connection of described first integrated circuit, second end of described first integrated circuit and the first resistance, the series circuit that first adjustable resistance forms with the second resistance is connected, the adjustable end ground connection of described first adjustable resistance, the plus earth of described first voltage stabilizing didoe, the negative electrode of described first voltage stabilizing didoe is connected with the first adjustable resistance and the second resistance respectively,
Described temperature measuring circuit comprises the second integrated circuit, 3rd resistance, 4th resistance, 5th resistance, first electric capacity, second electric capacity, 3rd electric capacity, second adjustable resistance, temperature sensor and the second voltage stabilizing didoe, the model of described second integrated circuit is INA118, 4th end of described second integrated circuit is by the second capacity earth, external-15V the DC voltage power supply of 4th end of described second integrated circuit, the first end of described second integrated circuit is connected with the 8th end of the second integrated circuit by the 5th resistance, the five terminal ground connection of described second integrated circuit, 7th end of described second integrated circuit is by the 3rd capacity earth, the external 15V DC voltage power supply of 7th end of described second integrated circuit, 3rd end of described second integrated circuit is connected with the negative electrode of the second voltage stabilizing didoe and passes through the second voltage stabilizing didoe ground connection, 3rd end of described second integrated circuit is by the first capacity earth, 3rd end of described second integrated circuit passes through the series circuit ground connection of the 3rd resistance and the second adjustable resistance composition, 3rd end of described second integrated circuit is by the external 5V DC voltage power supply of temperature sensor, the adjustable end ground connection of described second adjustable resistance, second end of described second integrated circuit is connected with the first adjustable resistance by the second resistance.
As preferably, in order to improve antijamming capability and the stability of circuit, the temperature drift coefficient of described first resistance, the second resistance, the 3rd resistance, the 4th resistance and the 5th resistance is 5%ppm.
As preferably, in order to improve the accuracy of temperature measuring circuit, the model of described temperature sensor is AD590.
The beneficial effects of the utility model are, this mobile phone liquid crystal screen temperature observation circuit, by adopting the feature that temperature sensor PT1 price is low, accuracy is high, not only reduces production cost, also assures that certainty of measurement; And pass through the accurate stabilized voltage characteristic of height of power reference circuit, further ensure thermometric accuracy.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is the circuit theory diagrams of the temperature measuring circuit of mobile phone liquid crystal screen temperature observation circuit of the present utility model;
Fig. 2 is the circuit theory diagrams of the power reference circuit of mobile phone liquid crystal screen temperature observation circuit of the present utility model;
In figure: U1. first integrated circuit, U2. second integrated circuit, R1. first resistance, R2. the second resistance, R3. the 3rd resistance, R4. the 4th resistance, R5. the 5th resistance, Rp1. first adjustable resistance, Rp2. second adjustable resistance, D1. the first voltage stabilizing didoe, D2. the second voltage stabilizing didoe, C1. first electric capacity, C2. second electric capacity, C3. the 3rd electric capacity, PT1. temperature sensor.
Embodiment
By reference to the accompanying drawings the utility model is described in further detail now.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present utility model are described in a schematic way, and therefore it only shows the formation relevant with the utility model.
As depicted in figs. 1 and 2, a kind of mobile phone liquid crystal screen temperature observation circuit, comprise power reference circuit and temperature measuring circuit, described power reference circuit is connected with temperature measuring circuit, described power reference circuit comprises the first integrated circuit U1, first resistance R1, second resistance R2, first voltage stabilizing didoe D1 and the first adjustable resistance Rp1, the model of described first integrated circuit U1 is MC1403, the external 12V DC voltage power supply of first end of described first integrated circuit U1, the 3rd end ground connection of described first integrated circuit U1, second end of described first integrated circuit U1 and the first resistance R1, the series circuit that first adjustable resistance Rp1 forms with the second resistance R2 is connected, the adjustable end ground connection of described first adjustable resistance Rp1, the plus earth of described first voltage stabilizing didoe D1, the negative electrode of described first voltage stabilizing didoe D1 is connected with the first adjustable resistance Rp1 and the second resistance R2 respectively,
Described temperature measuring circuit comprises the second integrated circuit U2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, first electric capacity C1, second electric capacity C2, 3rd electric capacity C3, second adjustable resistance Rp2, temperature sensor PT1 and the second voltage stabilizing didoe D2, the model of described second integrated circuit U2 is INA118, 4th end of described second integrated circuit U2 is by the second electric capacity C2 ground connection, external-15V the DC voltage power supply of 4th end of described second integrated circuit U2, the first end of described second integrated circuit U2 is connected with the 8th end of the second integrated circuit U2 by the 5th resistance R5, the five terminal ground connection of described second integrated circuit U2, 7th end of described second integrated circuit U2 is by the 3rd electric capacity C3 ground connection, the external 15V DC voltage power supply of 7th end of described second integrated circuit U2, 3rd end of described second integrated circuit U2 is connected with the negative electrode of the second voltage stabilizing didoe D2 and passes through the second voltage stabilizing didoe D2 ground connection, 3rd end of described second integrated circuit U2 is by the first electric capacity C1 ground connection, 3rd end of described second integrated circuit U2 passes through the series circuit ground connection of the 3rd resistance R3 and the second adjustable resistance Rp2 composition, 3rd end of described second integrated circuit U2 is by the external 5V DC voltage power supply of temperature sensor PT1, the adjustable end ground connection of described second adjustable resistance Rp2, second end of described second integrated circuit U2 is connected with the first adjustable resistance Rp1 by the second resistance R2.
As preferably, in order to improve antijamming capability and the stability of circuit, the temperature drift coefficient of described first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4 and the 5th resistance R5 is 5%ppm.
As preferably, in order to improve the accuracy of temperature measuring circuit, the model of described temperature sensor PT1 is AD590.
In temperature measuring circuit, the model of the second integrated circuit U2 is INA118, the model of temperature sensor PT1 is AD590, the electric current that temperature sensor PT1 exports 0 DEG C time is I=273uA, when outer meeting resistance is 1k, temperature often increases by 1 DEG C, and electric current I increases 1uA, and output voltage variation with temperature is 1mV/K.
In power reference circuit, the model of the first integrated circuit U1 is MC1403, and regulate the resistance of the first adjustable resistance Rp1 be connected with reference voltage source MC1403, make it export the voltage of 273mV, the 273mV voltage coating-forming voltage exported with AD590 is poor.
Be input in the second integrated circuit U2 by the voltage difference of the reference voltage source in power reference circuit and temperature sensor PT1, then amplify ten times of outputs after voltage difference being carried out processing.
Compared with prior art, this mobile phone liquid crystal screen temperature observation circuit, by adopting the feature that temperature sensor PT1 price is low, accuracy is high, not only reduces production cost, also assures that certainty of measurement; And pass through the accurate stabilized voltage characteristic of height of power reference circuit, further ensure thermometric accuracy.
With above-mentioned according to desirable embodiment of the present utility model for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this utility model technological thought, can carry out various change and amendment completely.The technical scope of this utility model is not limited to the content on specification, must determine its technical scope according to right.
Claims (3)
1. a mobile phone liquid crystal screen temperature observation circuit, it is characterized in that, comprise power reference circuit and temperature measuring circuit, described power reference circuit is connected with temperature measuring circuit, described power reference circuit comprises the first integrated circuit (U1), first resistance (R1), second resistance (R2), first voltage stabilizing didoe (D1) and the first adjustable resistance (Rp1), the model of described first integrated circuit (U1) is MC1403, the external 12V DC voltage power supply of first end of described first integrated circuit (U1), 3rd end ground connection of described first integrated circuit (U1), second end of described first integrated circuit (U1) and the first resistance (R1), the series circuit that first adjustable resistance (Rp1) forms with the second resistance (R2) is connected, the adjustable end ground connection of described first adjustable resistance (Rp1), the plus earth of described first voltage stabilizing didoe (D1), the negative electrode of described first voltage stabilizing didoe (D1) is connected with the first adjustable resistance (Rp1) and the second resistance (R2) respectively,
Described temperature measuring circuit comprises the second integrated circuit (U2), 3rd resistance (R3), 4th resistance (R4), 5th resistance (R5), first electric capacity (C1), second electric capacity (C2), 3rd electric capacity (C3), second adjustable resistance (Rp2), temperature sensor (PT1) and the second voltage stabilizing didoe (D2), the model of described second integrated circuit (U2) is INA118, 4th end of described second integrated circuit (U2) is by the second electric capacity (C2) ground connection, external-15V the DC voltage power supply of 4th end of described second integrated circuit (U2), the first end of described second integrated circuit (U2) is connected with the 8th end of the second integrated circuit (U2) by the 5th resistance (R5), the five terminal ground connection of described second integrated circuit (U2), 7th end of described second integrated circuit (U2) is by the 3rd electric capacity (C3) ground connection, the external 15V DC voltage power supply of 7th end of described second integrated circuit (U2), 3rd end of described second integrated circuit (U2) is connected with the negative electrode of the second voltage stabilizing didoe (D2) and passes through the second voltage stabilizing didoe (D2) ground connection, 3rd end of described second integrated circuit (U2) is by the first electric capacity (C1) ground connection, the series circuit ground connection that 3rd end of described second integrated circuit (U2) consists of the 3rd resistance (R3) and the second adjustable resistance (Rp2), 3rd end of described second integrated circuit (U2) is by the external 5V DC voltage power supply of temperature sensor (PT1), the adjustable end ground connection of described second adjustable resistance (Rp2), second end of described second integrated circuit (U2) is connected with the first adjustable resistance (Rp1) by the second resistance (R2).
2. mobile phone liquid crystal screen temperature observation circuit as claimed in claim 1, it is characterized in that, the temperature drift coefficient of described first resistance (R1), the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4) and the 5th resistance (R5) is 5%ppm.
3. mobile phone liquid crystal screen temperature observation circuit as claimed in claim 1, it is characterized in that, the model of described temperature sensor (PT1) is AD590.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520551406.9U CN204810367U (en) | 2015-07-27 | 2015-07-27 | Cell -phone LCD screen temperature monitoring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520551406.9U CN204810367U (en) | 2015-07-27 | 2015-07-27 | Cell -phone LCD screen temperature monitoring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204810367U true CN204810367U (en) | 2015-11-25 |
Family
ID=54595112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520551406.9U Expired - Fee Related CN204810367U (en) | 2015-07-27 | 2015-07-27 | Cell -phone LCD screen temperature monitoring circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204810367U (en) |
-
2015
- 2015-07-27 CN CN201520551406.9U patent/CN204810367U/en not_active Expired - Fee Related
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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 |
Granted publication date: 20151125 |
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| CF01 | Termination of patent right due to non-payment of annual fee |