CN203811566U - Humidity detection circuit and mobile terminal - Google Patents
Humidity detection circuit and mobile terminal Download PDFInfo
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- CN203811566U CN203811566U CN201420074056.7U CN201420074056U CN203811566U CN 203811566 U CN203811566 U CN 203811566U CN 201420074056 U CN201420074056 U CN 201420074056U CN 203811566 U CN203811566 U CN 203811566U
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Abstract
The utility model relates to the technical field of electronics, in particular to a humidity detection circuit and a mobile terminal. The humidity detection circuit comprises a bias voltage power supply circuit, a signal processing circuit and an MEMS (Micro Electromechanical System) capacitance sensor, wherein the bias voltage power supply circuit is used for providing bias voltage; the signal processing circuit is provided with an input end and is used for processing an input signal; the MEMS capacitance sensor is used for sensing humidity information and comprises two electrodes, wherein one electrode is connected with the bias voltage power supply circuit, and the other electrode is grounded through a partial pressure branch; a partial pressure node is formed at the connecting point of the MEMS capacitance sensor and the partial pressure branch and leads out a signal as the input signal processed by the signal processing circuit. The humidity detection circuit can be used for detecting humidity in air on one hand and can also be used for detecting whether water enters portable electronic equipment for a long time or not on the other hand; information is provided for maintenance.
Description
Technical field
The utility model relates to electronic technology field, is specifically related to a kind of humidity measuring circuit and mobile terminal.
Background technology
Along with extensively popularizing of mobile terminal, various most common failures also frequently occur, water inlet has fatal harm to mobile terminal, may cause the mobile terminal cannot normal boot-strap, screen is fuzzy, camera is unintelligible etc., severe patient more may cause main board failure or damage, needs special treatment step; Concerning mobile terminal maintenance personal, the thing of worst is whether mobile terminal is intake and known nothing, and adopts wrong maintenance step and method, thereby causes fixing a breakdown in time, causes larger economic loss.
Utility model content
The purpose of this utility model is, a kind of humidity measuring circuit is provided, and solves above technical matters;
The purpose of this utility model is also, a kind of mobile terminal is provided, and solves above technical matters;
The technical matters that the utility model solves can realize by the following technical solutions:
A kind of humidity measuring circuit, wherein, comprises
One bias voltage feed circuit, for providing bias voltage;
One signal processing circuit, for input signal is processed, described signal processing circuit is provided with input end;
One MEMS capacitive transducer, for sensing humidity information, described MEMS capacitive transducer comprises two electrodes, an electrode connects described bias voltage; Another electrode is by a dividing potential drop grounding, and the point that described MEMS capacitive transducer is connected with described dividing potential drop branch road is as dividing potential drop node; The signal that described dividing potential drop node is drawn is connected to the input end of described signal processing circuit, as the input signal of described signal processing circuit.
Preferably, described signal processing circuit comprises amplifying circuit, for described input signal is amplified.
Preferably, described signal processing circuit also comprises an analog to digital converter, and the signal output part of described amplifying circuit connects described analog to digital converter.
Preferably, described signal processing circuit is included in an integrated circuit (IC) chip.
Preferably, described dividing potential drop branch road comprises a resistance.
Preferably, the resistance of described resistance is 50G ohm.
Preferably, described MEMS capacitive transducer adopts MEMS acoustics chip.
The utility model also provides a kind of mobile terminal, wherein, comprises a humidity measuring circuit, and described humidity measuring circuit comprises:
One bias voltage feed circuit, for providing bias voltage;
One signal processing circuit, for input signal is processed, described signal processing circuit is provided with input end;
One MEMS capacitive transducer, for sensing humidity information, described MEMS capacitive transducer comprises two electrodes, an electrode connects described bias voltage; Another electrode is by a dividing potential drop grounding, and the point that described MEMS capacitive transducer is connected with described dividing potential drop branch road is as dividing potential drop node; The signal that described dividing potential drop node is drawn is connected to the input end of described signal processing circuit, as the input signal of described signal processing circuit.
Preferably, described MEMS capacitive transducer adopts MEMS acoustics chip, also for voice signal is converted to ac signal.
Preferably, described dividing potential drop branch road comprises a resistance, and the resistance of described resistance is 50G ohm.
Whether for a long time beneficial effect: owing to adopting above technical scheme, the utility model on the one hand, can be realized normal voice capturing function, realizes normal talking, can detect on the other hand humidity in air, also can be used for detecting portable electric appts water inlet; For maintenance provides information.
Brief description of the drawings
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, belongs to the scope that the utility model is protected.
It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the utility model can combine mutually.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but not as restriction of the present utility model.
With reference to Fig. 1, a kind of humidity measuring circuit, wherein, comprises
One bias voltage feed circuit, for providing bias voltage (Vbias);
One signal processing circuit, signal processing circuit is provided with input end, for input signal is processed, obtains humidity parameter;
One MEMS capacitive transducer 3, MEMS capacitive transducer 3 is for sensing humidity information, and it comprises two electrodes, and an electrode connects bias voltage (Vbias); Another electrode is by a bleeder circuit ground connection (GND), and the point that MEMS capacitive transducer 3 is connected with bleeder circuit is as dividing potential drop node; The signal that dividing potential drop node is drawn is connected to the input end of signal processing circuit, as the input signal of signal processing circuit.
Bleeder circuit has fixed resistance value, the equiva lent impedance that resistance R 2 in figure in dotted line frame 4 is air, conventionally more than 100G ohm, air humidity can affect the numerical value of resistance R 2, when air humidity becomes large, the numerical value of resistance R 2 can decline, the existing DC characteristic of MEMS capacitive transducer 3 has again AC characteristic, the present invention utilizes the DC characteristic composition humidity measuring circuit of MEMS capacitive transducer 3 structures, in the time that air humidity becomes large, due to the characteristic of semiconductor of MEMS capacitive transducer 3, impedance stabilization, and the equiva lent impedance of air reduces, bleeder circuit both end voltage rises, signal processing circuit is obtained the signal that dividing potential drop node is drawn, to voltage signal processing, realize the detection of ambient humidity.
As a kind of preferred embodiment of the present utility model, signal processing circuit comprises amplifying circuit 5, for input signal is amplified.
As a kind of preferred embodiment of the present utility model, amplifying circuit 5 comprises an amplifier (AMP, Amplifier).
As a kind of preferred embodiment of the present utility model, signal processing circuit comprises analog to digital converter (ADC) 6, and the signal output part of amplifying circuit connects an analog to digital converter 6.
As a kind of preferred embodiment of the present utility model, signal processing circuit is included in a dedicated IC chip (ASIC, Application Specific Integrated Circuit).
As a kind of preferred embodiment of the present utility model, bleeder circuit comprises a resistance R 1, and preferably, the resistance of resistance R 1 is 50G ohm, wherein 1G=10
9.
As a kind of preferred embodiment of the present utility model, MEMS capacitive transducer 3 adopts MEMS acoustics chip.MEMS acoustics chip in the time of the transducing for voice signal, acquisition be AC signal, utilization be the AC characteristic of MEMS acoustics chip, the utility model utilizes the DC characteristic of MEMS acoustics chip.
The utility model also provides a kind of mobile terminal, wherein, comprises a humidity measuring circuit, and humidity measuring circuit comprises:
One bias voltage feed circuit, for providing bias voltage (Vbias);
One signal processing circuit, signal processing circuit is provided with input end, for input signal is processed, obtains humidity parameter;
One MEMS capacitive transducer 3, MEMS capacitive transducer 3 is for sensing humidity information, and it comprises two electrodes, and an electrode connects bias voltage (Vbias); Another electrode is by a bleeder circuit ground connection (GND), and the point that MEMS capacitive transducer 3 is connected with bleeder circuit is as dividing potential drop node; The signal that dividing potential drop node is drawn is connected to the input end of signal processing circuit, as the input signal of signal processing circuit.
As a kind of preferred embodiment of the present utility model, MEMS capacitive transducer 3 is also for being converted to ac signal by voice signal.
As a kind of preferred embodiment of the present utility model, bleeder circuit comprises a resistance R 1, and preferably, the resistance of resistance R 1 is 50G ohm, wherein 1G=10
9.
As a kind of preferred embodiment of the present utility model, be applied to mobile phone or panel computer.
Due in the sensor of the mobile terminal such as mobile phone or panel computer, only having microphone is open system, contact with the external world, the utility model can utilize the MEMS microphone of mobile phone or panel computer self, on the one hand, can realize normal voice capturing function, realize normal talking, can detect on the other hand humidity in air, also can be used for detecting whether for a long time water inlet of portable electric appts; For maintenance provides information.
A kind of implementation method, when mobile phone communication, does not detect humidity, and voice signal is converted to ac signal by MEMS capacitive transducer 3, realizes conventional application; When closing after call, need to detect humidity time, in the signal that MEMS capacitive transducer 3 can be obtained, the target signal filter of 20Hz-20KHz falls, retain direct current signal, the 20Hz-20KHz bandwidth that to be MEMS capacitive transducer 3 set when picking up voice signal, this is the frequency range matching with human auditory's physiological function.
The foregoing is only the utility model preferred embodiment; not thereby limit embodiment of the present utility model and protection domain; to those skilled in the art; the scheme that being equal to of should recognizing that all utilization the utility model instructionss and diagramatic content done replaces and apparent variation obtains, all should be included in protection domain of the present utility model.
Claims (10)
1. a humidity measuring circuit, is characterized in that, comprises
One bias voltage feed circuit, for providing bias voltage;
One signal processing circuit, for input signal is processed, described signal processing circuit is provided with input end;
One MEMS capacitive transducer, for sensing humidity information, described MEMS capacitive transducer comprises two electrodes, an electrode connects described bias voltage; Another electrode is by a dividing potential drop grounding, and the point that described MEMS capacitive transducer is connected with described dividing potential drop branch road is as dividing potential drop node; The signal that described dividing potential drop node is drawn is connected to the input end of described signal processing circuit, as the input signal of described signal processing circuit.
2. a kind of humidity measuring circuit according to claim 1, is characterized in that, described signal processing circuit comprises amplifying circuit, for described input signal is amplified.
3. a kind of humidity measuring circuit according to claim 2, is characterized in that, described signal processing circuit also comprises an analog to digital converter, and the signal output part of described amplifying circuit connects described analog to digital converter.
4. a kind of humidity measuring circuit according to claim 1, is characterized in that, described signal processing circuit is included in an integrated circuit (IC) chip.
5. a kind of humidity measuring circuit according to claim 1, is characterized in that, described dividing potential drop branch road comprises a resistance.
6. a kind of humidity measuring circuit according to claim 5, is characterized in that, the resistance of described resistance is 50G ohm.
7. a kind of humidity measuring circuit according to claim 1, is characterized in that, described MEMS capacitive transducer adopts MEMS acoustics chip.
8. a mobile terminal, is characterized in that, comprises a humidity measuring circuit, and described humidity measuring circuit comprises:
One bias voltage feed circuit, for providing bias voltage;
One signal processing circuit, for input signal is processed, described signal processing circuit is provided with input end;
One MEMS capacitive transducer, for sensing humidity information, described MEMS capacitive transducer comprises two electrodes, an electrode connects described bias voltage; Another electrode is by a dividing potential drop grounding, and the point that described MEMS capacitive transducer is connected with described dividing potential drop branch road is as dividing potential drop node; The signal that described dividing potential drop node is drawn is connected to the input end of described signal processing circuit, as the input signal of described signal processing circuit.
9. mobile terminal according to claim 8, is characterized in that, described MEMS capacitive transducer adopts MEMS acoustics chip, also for voice signal is converted to ac signal.
10. mobile terminal according to claim 8, is characterized in that, described dividing potential drop branch road comprises a resistance, and the resistance of described resistance is 50G ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420074056.7U CN203811566U (en) | 2014-02-20 | 2014-02-20 | Humidity detection circuit and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420074056.7U CN203811566U (en) | 2014-02-20 | 2014-02-20 | Humidity detection circuit and mobile terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203811566U true CN203811566U (en) | 2014-09-03 |
Family
ID=51450300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420074056.7U Expired - Lifetime CN203811566U (en) | 2014-02-20 | 2014-02-20 | Humidity detection circuit and mobile terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203811566U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865297A (en) * | 2014-02-20 | 2015-08-26 | 钰太芯微电子科技（上海）有限公司 | Humidity detecting circuit and mobile terminal |
-
2014
- 2014-02-20 CN CN201420074056.7U patent/CN203811566U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865297A (en) * | 2014-02-20 | 2015-08-26 | 钰太芯微电子科技（上海）有限公司 | Humidity detecting circuit and mobile terminal |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140903 |