CN106603760A - Water-in automatic protection circuit and method for achieving same - Google Patents
Water-in automatic protection circuit and method for achieving same Download PDFInfo
- Publication number
- CN106603760A CN106603760A CN201611107586.7A CN201611107586A CN106603760A CN 106603760 A CN106603760 A CN 106603760A CN 201611107586 A CN201611107586 A CN 201611107586A CN 106603760 A CN106603760 A CN 106603760A
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- China
- Prior art keywords
- protection circuit
- circuit
- water inlet
- automatic protection
- master chip
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal fluid pressure, liquid level or liquid displacement, e.g. Buchholz relays
- H02H5/083—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal fluid pressure, liquid level or liquid displacement, e.g. Buchholz relays responsive to the entry or leakage of a liquid into an electrical appliance
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Direct Current Feeding And Distribution (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses a water-in automatic protection circuit and a method for achieving the same. The circuit includes: a humidity detection module for detecting humidity and generating a power-on/off signal based on the result of the detection; a voltage converting circuit for converting the power-on/off signal of the humidity detection module to an electrical level signal which is receivable by a master chip; a power supply switch circuit for determining whether to continuously power the water-in automatic protection circuit when a mobile phone is at a standby state and when the mobile phone is powered on; a master chip for based on the power-on/off signal output by the voltage converting circuit, generating a control signal which the circuit; a protection circuit which is connected to the master chip and is intended for connecting or disconnecting the circuit under the control of the control signal which is generated by the mater chip. According to the invention, the water-in automatic protection circuit can disconnecting the power supply when the mobile phone is in water, and prevents the mobile phone from being damaged due to short circuit inside the mobile phone.
Description
Technical field
The present invention relates to a kind of water inlet automatic protection circuit and its implementation, more particularly to a kind of water inlet of mobile phone is certainly
Dynamic protection circuit and its implementation.
Background technology
In modern society, almost everyone has the mobile phone of oneself, and in all case any place can use mobile phone,
But many times mobile phone can be dropped in water because the carelessness of oneself, or be likely due to the carelessness of user, when placing mobile phone
Do not find that lay down location has water, cause mobile phone to be intake, now mobile phone does not shut down, when water penetrate into interior of mobile phone when, therefore when mobile phone
In also in energization, the conduction of water is added so as to result in burning for components and parts on mainboard, it is final to damage mainboard and other yuan
Device, user such as wants to be continuing with the mobile phone, if it has to the components and parts for burning are changed to helpdesk, and these maintenance services are usual
It is costly, some users then often abandon keeping in repair and buying mobile phone again, cause very big waste.
In order to improve this problem, people also attempt employing various methods, and existing mobile phone is in order to protect because of imprudence handss
Machine water inlet causes the method that mobile phone damages employing plus dust-proof, waterproof and the anti-scratch containment vessel having, some employings plus printed circuit
Plate protects film method, but all still there is the risk for seeping water, and still results in the damage of mobile phone.
The content of the invention
To overcome the shortcomings of that above-mentioned prior art is present, the purpose of the present invention is to provide a kind of water inlet automatic protection circuit
And its implementation, to cut off power supply immediately after intaking in mobile phone, it is to avoid interior of mobile phone is short-circuited and damages mobile phone.
It is that, up to above-mentioned purpose, the present invention proposes a kind of water inlet automatic protection circuit, including：
Humidity detecting module, for detecting humidity information, according to testing result make-and-break signal is produced；
Voltage conversion circuit, for the make-and-break signal of the humidity detecting module to be converted to into the receptible level letter of master chip
Number；
Switching circuit of power supply, for deciding whether to be fed water automatic protection circuit continued power in standby and start；
Master chip, the make-and-break signal for being exported according to voltage conversion circuit produces the control signal of protection circuit；
Protection circuit, is connected to the master chip, for cut-out or conducting under the control signal control that the master chip is produced
Circuit.
Further, the humidity measuring circuit includes k drimeter in parallel, wherein k >=1.
Further, each drimeter of the humidity detecting module is placed at mobile phone easily water inlet.
Further, the switching circuit of power supply includes mechanically or electrically switching, and its input connects the battery supply, output
End connects the voltage conversion circuit and humidity detecting module.
Further, the voltage conversion circuit is exported low level when the humidity detecting module detects humidity information
Make-and-break signal is to the master chip.
Further, the voltage conversion circuit includes first resistor, second resistance and an audion, the power switch electricity
The outfan on road is connected to one end of first resistor, and the other end of first resistor is connected to the colelctor electrode of the audion, and this second
One end of resistance connects the humidity detecting module, and the other end is connected to the base stage of the audion, the grounded emitter of the audion.
Further, the audion is NPN triode.
Further, the protection circuit includes a metal-oxide-semiconductor, and the metal-oxide-semiconductor grid connects the control signal of the master chip, and source electrode connects
Cell voltage, substrate and drain electrode welding system supply voltage, the indirect diode of the source and drain of the metal-oxide-semiconductor.
Further, the protection circuit turns off metal-oxide-semiconductor under the control of the control signal of high level.
To reach above-mentioned purpose, the present invention also provides a kind of implementation method of water inlet automatic protection circuit, including following step
Suddenly：
Step one, using humidity detecting module humidity information is detected, and produces make-and-break signal to main core according to testing result
Piece；
Step 2, the master chip produces the control signal of control protection electric circuit according to the make-and-break signal for receiving；
Step 3, protection circuit is cut off or turning circuit under the control of the control signal.
Compared with prior art, a kind of water inlet automatic protection circuit of the present invention and its implementation are by cell phone mainboard
Increase humidity module, voltage conversion circuit, switching circuit of power supply and protection circuit, you can realize being cut immediately after mobile phone water inlet
Power-off source, it is to avoid interior of mobile phone is short-circuited and damages mobile phone, humidity detecting module of the present invention is extremely simple, and cost is relatively low.
Description of the drawings
Fig. 1 is a kind of circuit diagram of water inlet automatic protection circuit of the present invention；
Fig. 2 is the thin portion circuit diagram of protection circuit 50 in the specific embodiment of the invention；
The step of Fig. 3 is a kind of implementation method of water inlet automatic protection circuit of present invention flow chart.
Specific embodiment
Below by way of specific instantiation and embodiments of the present invention are described with reference to the drawings, those skilled in the art can
The further advantage and effect of the present invention are understood easily by content disclosed in the present specification.The present invention also can be different by other
Instantiation implemented or applied, the every details in this specification also can based on different viewpoints with application, without departing substantially from
Various modifications and change are carried out under the spirit of the present invention.
Fig. 1 is a kind of circuit diagram of water inlet automatic protection circuit of the present invention.As shown in figure 1, a kind of water inlet of the present invention
Automatic protection circuit, including：Humidity detecting module 10, voltage conversion circuit 20, switching circuit of power supply 30, master chip 40 and guarantor
Protection circuit 50.
Wherein humidity detecting module 10, for detecting humidity information, produces make-and-break signal, in the present invention according to testing result
In specific embodiment, humidity detecting module 10 includes the individual drimeters in parallel of k (k >=1), and it is placed in where mobile phone easily water inlet,
Such as USB interface is in, loudspeaker and receiver, MIC holes side, so as to mobile phone water inlet after, the drimeter at corresponding easily water inlet is detectd at first
Measure, circuitry cuts, so as to protect the purpose for protecting plank and part is reached so as to before mainboard water inlet；Voltage conversion circuit
20 is an on-off circuit, is made up of resistance R1, R2 and NPN triode, for the make-and-break signal of humidity detecting module 10 to be changed
For the receptible level signal of master chip (Host CPU) 40；Switching circuit of power supply 30 can be mechanically or electrically to switch, for certainly
It is fixed whether to be fed water automatic protection circuit continued power in standby and start；Protection circuit 50 is connected to master chip (Host
CPU), for cut-out or turning circuit under the control signal CONTROL control that master chip 40 is produced.
Specifically, battery supply Power is connected to the input of switching circuit of power supply 30, switching circuit of power supply 30 it is defeated
Go out end node A one end for being connected to resistance R1 and k hygroscopic one end being connected in parallel, the other end of resistance R1 is connected to
The colelctor electrode of NPN triode Q1, the k being connected in parallel a hygroscopic other end is connected to one end of resistance R2, and resistance R2 is another
One end is connected to the base stage of NPN triode Q1, and the transmitter of NPN triode Q1 is grounded, and wherein R1 is used as pull-up resistor, one side
Metering function is played after audion Q1 is opened, still further aspect plays pull-up effect for output signal, and R2 is current-limiting resistance.
Voltage conversion circuit 20 can connect power supply using corresponding PNP circuits, i.e. transistor emitter, and colelctor electrode is by electricity
Resistance R2 ground connection, the k being connected in parallel hygroscopic one end ground connection；Also this function can be realized using other structures circuit such as, CMOS
Circuit, the present invention is not limited.
Fig. 2 be the specific embodiment of the invention in protection circuit 50 thin portion circuit diagram, wherein VBAT be cell voltage, VSYS
For the voltage that whole system is powered, CONTROL is that master chip is believed according to the control that the make-and-break signal of humidity detecting module 10 is produced
Number, Q2 is metal-oxide-semiconductor, wherein, metal-oxide-semiconductor Q2 grids connect control signal CONTROL, and source electrode meets Vbat, and substrate and drain electrode meet VSYS, and two
Pole pipe D1 is connected between the source and drain of metal-oxide-semiconductor Q2.When control signal CONTROL is low, VBAT and VSYS is turned on, and works as control
When signal CONTROL is high, Q2 shut-offs, VSYS is not exported, and whole system is not powered.
Below in conjunction with the operation principle of Fig. 1 and Fig. 2 explanation present invention：
When mobile phone is normally used, when water inlet, because two electrodes of drimeter are to disconnect, audion Q1 (NPN
Pipe) base stage do not have voltage, and NPN triode Q1 is closed, and the signal of output to master chip (host CPU) is high level, due to output
As the make-and-break signal of the humidity detecting module of interrupting input it is Low level effective to master chip (host CPU), therefore now handss
Machine does not do any action.
After mobile phone is intake, hygroscopic two electric pole short circuits of humidity detecting module, the base voltage of NPN triode Q1
For height, NPN triode Q1 is now opened, the voltage of B points is pulled low, the make-and-break signal exported to master chip (host CPU) is changed into
Low level.Master chip (host CPU) thinks that interruption comes, and now master chip (host CPU) can produce the control letter of high level
Number CONTROL, control signal CONTROL cut-out metal-oxide-semiconductor Q2, so as to the output of the VSYS that cuts off the electricity supply is not intended for whole mobile phone
Electricity.This process time is extremely short, can complete the action of protection into before mainboard in water completely.
After mobile phone water inlet user dries up the water of the inside including hygroscopic water, hygroscopic two electrodes become disconnected again
The state opened, then again can be with protection circuit.
The step of Fig. 3 is a kind of implementation method of water inlet automatic protection circuit of present invention flow chart.As shown in figure 3, this
A kind of implementation method of bright water inlet automatic protection circuit, comprises the steps：
Step 301, using humidity detecting module humidity information is detected, and produces make-and-break signal to main core according to testing result
Piece.In the specific embodiment of the invention, humidity detecting module includes the individual drimeters in parallel of k (k >=1), and it is placed in mobile phone and easily enters
Where water, such as USB interface is in, loudspeaker and receiver, MIC holes side, so as to mobile phone water inlet after, the humidity at corresponding easily water inlet
Meter is detected at first, circuitry cuts, the purpose for protecting plank and part is reached so as to protect, at this so as to before mainboard water inlet
In invention specific embodiment, when humidity detecting module detects mobile phone intakes, hygroscopic two electric pole short circuits, so as to pass through
The low level make-and-break signal that voltage transformation module is produced is to master chip.
Step 302, master chip produces control signal CONTROL of control protection electric circuit according to the make-and-break signal for receiving,
In the specific embodiment of the invention, when master chip receives low level make-and-break signal, then it is assumed that be interrupt signal, high electricity is produced
Flat control signal CONTROL.
Step 303, protection circuit is cut off or turning circuit under the control of control signal CONTROL.Of the invention concrete
In embodiment, when control signal CONTROL is low, protection circuit causes VBAT and VSYS conductings, works as control signal
When CONTROL is high, circuit is cut off so that VSYS is not exported, and whole system is not powered, wherein, VBAT is battery
Voltage, the voltage that VSYS powers for whole system.
In sum, a kind of water inlet automatic protection circuit of the present invention and its implementation are wet by increasing on cell phone mainboard
Degree module, voltage conversion circuit, switching circuit of power supply and protection circuit, you can realize cutting off electricity immediately after mobile phone water inlet
Source, it is to avoid interior of mobile phone is short-circuited and damages mobile phone, humidity detecting module of the present invention is extremely simple, and cost is relatively low.
Any those skilled in the art can repair under the spirit and the scope without prejudice to the present invention to above-described embodiment
Decorations and change.Therefore, the scope of the present invention, should be as listed by claims.
Claims (10)
1. a kind of water inlet automatic protection circuit, including：
Humidity detecting module, for detecting humidity information, according to testing result make-and-break signal is produced；
Voltage conversion circuit, for the make-and-break signal of the humidity detecting module to be converted to into the receptible level signal of master chip；
Switching circuit of power supply, for deciding whether to be fed water automatic protection circuit continued power in standby and start；
Master chip, the make-and-break signal for being exported according to voltage conversion circuit produces the control signal of protection circuit；
Protection circuit, is connected to the master chip, for cut-out or turning circuit under the control signal control that the master chip is produced.
2. water inlet automatic protection circuit as claimed in claim 1 a kind of, it is characterised in that：The humidity measuring circuit includes k
Drimeter in parallel, wherein k >=1.
3. water inlet automatic protection circuit as claimed in claim 2 a kind of, it is characterised in that：The humidity detecting module it is each wet
Degree meter is placed at mobile phone easily water inlet.
4. water inlet automatic protection circuit as claimed in claim 2 a kind of, it is characterised in that：The switching circuit of power supply includes machinery
Or electrical switch, its input connects the battery supply, and outfan connects the voltage conversion circuit and humidity detecting module.
5. water inlet automatic protection circuit as claimed in claim 2 a kind of, it is characterised in that：The voltage conversion circuit is in the humidity
When detection module detects humidity information, low level make-and-break signal is exported to the master chip.
6. water inlet automatic protection circuit as claimed in claim 5 a kind of, it is characterised in that：The voltage conversion circuit includes first
Resistance, second resistance and an audion, the outfan of the switching circuit of power supply is connected to one end of first resistor, first resistor
The other end be connected to the colelctor electrode of the audion, one end of the second resistance connects the humidity detecting module, other end connection
To the base stage of the audion, the grounded emitter of the audion.
7. water inlet automatic protection circuit as claimed in claim 6 a kind of, it is characterised in that：The audion is NPN triode.
8. water inlet automatic protection circuit as claimed in claim 2 a kind of, it is characterised in that：The protection circuit includes a metal-oxide-semiconductor,
The metal-oxide-semiconductor grid connects the control signal of the master chip, and source electrode meets cell voltage, substrate and drain electrode welding system supply voltage, the MOS
The indirect diode of the source and drain of pipe.
9. water inlet automatic protection circuit as claimed in claim 8 a kind of, it is characterised in that：Control of the protection circuit in high level
Under the control of signal processed, metal-oxide-semiconductor is turned off.
10. a kind of implementation method of water inlet automatic protection circuit, comprises the steps：
Step one, using humidity detecting module humidity information is detected, and produces make-and-break signal to master chip according to testing result；
Step 2, the master chip produces the control signal of control protection electric circuit according to the make-and-break signal for receiving；
Step 3, protection circuit is cut off or turning circuit under the control of the control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611107586.7A CN106603760A (en) | 2016-12-06 | 2016-12-06 | Water-in automatic protection circuit and method for achieving same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611107586.7A CN106603760A (en) | 2016-12-06 | 2016-12-06 | Water-in automatic protection circuit and method for achieving same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106603760A true CN106603760A (en) | 2017-04-26 |
Family
ID=58595060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611107586.7A Pending CN106603760A (en) | 2016-12-06 | 2016-12-06 | Water-in automatic protection circuit and method for achieving same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106603760A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109462210A (en) * | 2018-11-26 | 2019-03-12 | 东莞市大忠电子有限公司 | A kind of built-in water purifier waterproof power supply adaptor with humidity defencive function |
| CN110829385A (en) * | 2019-10-29 | 2020-02-21 | 深圳市吉影科技有限公司 | Battery leakage protection circuit and method and electronic product |
| WO2020073253A1 (en) * | 2018-10-10 | 2020-04-16 | 华为技术有限公司 | Method, circuit and electronic device for detecting water immersion |
| CN111109780A (en) * | 2019-12-31 | 2020-05-08 | 歌尔科技有限公司 | Wristband equipment and immersion liquid detection method thereof |
| CN111198575A (en) * | 2020-02-27 | 2020-05-26 | 西北工业大学 | Unmanned aerial vehicle flight controller |
| CN111309130A (en) * | 2020-02-20 | 2020-06-19 | 华为技术有限公司 | Mobile terminal and method for realizing water inlet protection |
| CN111638015A (en) * | 2020-06-29 | 2020-09-08 | 歌尔科技有限公司 | Water inlet detection device and method for interface equipment |
| CN111901961A (en) * | 2020-08-07 | 2020-11-06 | 张世卓 | Intelligent circuit board capable of working in water and manufacturing method thereof |
| CN112103917A (en) * | 2020-09-29 | 2020-12-18 | 青岛海信移动通信技术股份有限公司 | Electronic equipment and water inlet protection method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020073253A1 (en) * | 2018-10-10 | 2020-04-16 | 华为技术有限公司 | Method, circuit and electronic device for detecting water immersion |
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| CN109462210A (en) * | 2018-11-26 | 2019-03-12 | 东莞市大忠电子有限公司 | A kind of built-in water purifier waterproof power supply adaptor with humidity defencive function |
| CN110829385A (en) * | 2019-10-29 | 2020-02-21 | 深圳市吉影科技有限公司 | Battery leakage protection circuit and method and electronic product |
| CN111109780A (en) * | 2019-12-31 | 2020-05-08 | 歌尔科技有限公司 | Wristband equipment and immersion liquid detection method thereof |
| CN111309130A (en) * | 2020-02-20 | 2020-06-19 | 华为技术有限公司 | Mobile terminal and method for realizing water inlet protection |
| CN111309130B (en) * | 2020-02-20 | 2023-09-22 | 华为技术有限公司 | Mobile terminal and method for realizing water inflow protection |
| CN111198575A (en) * | 2020-02-27 | 2020-05-26 | 西北工业大学 | Unmanned aerial vehicle flight controller |
| CN111638015A (en) * | 2020-06-29 | 2020-09-08 | 歌尔科技有限公司 | Water inlet detection device and method for interface equipment |
| CN111901961A (en) * | 2020-08-07 | 2020-11-06 | 张世卓 | Intelligent circuit board capable of working in water and manufacturing method thereof |
| CN111901961B (en) * | 2020-08-07 | 2021-09-28 | 张世卓 | Intelligent circuit board capable of working in water and manufacturing method thereof |
| CN112103917A (en) * | 2020-09-29 | 2020-12-18 | 青岛海信移动通信技术股份有限公司 | Electronic equipment and water inlet protection method |
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Application publication date: 20170426 |