CN112103917A - Electronic equipment and water inlet protection method - Google Patents
Electronic equipment and water inlet protection method Download PDFInfo
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- CN112103917A CN112103917A CN202011052829.8A CN202011052829A CN112103917A CN 112103917 A CN112103917 A CN 112103917A CN 202011052829 A CN202011052829 A CN 202011052829A CN 112103917 A CN112103917 A CN 112103917A
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- 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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Abstract
The invention discloses electronic equipment and a water inlet protection method, which are used for solving the problem that the detection of water inlet of the electronic equipment is inaccurate in the prior art. The electronic equipment provided by the embodiment of the invention comprises a water inlet detection circuit, a control circuit and a power supply, wherein one end of the water inlet detection circuit is connected with at least one water inlet detection point, the output end of the water inlet detection circuit is connected with the input end of the control circuit and used for outputting a level signal for representing water inlet of the electronic equipment if a resistance value exists at the at least one water inlet detection point, and the control end of the control circuit is connected with the power supply and used for controlling the power supply to stop supplying power to the electronic equipment according to the level signal. Because at least one water inlet detection point can be arranged, if the resistance value exists at the at least one water inlet detection point, the water inlet detection circuit outputs a level signal for representing the water inlet of the electronic equipment, so that the accuracy of the water inlet detection of the electronic equipment can be improved.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to electronic equipment and a water inlet protection method.
Background
At present, the waterproof of electronic equipment is mostly physical waterproof, for example, a very thick and heavy three-proof mobile phone made of a shell of the mobile phone; the whole machine of the electronic equipment is sprayed with the nano film, and the hydrophobicity of the nano film is utilized to prevent water.
The circuit of the electronic device does not have a water inlet detection function, and along with the use of the mobile phone, the shell is damaged, the nano film fails, and the electronic device still can enter water, so that the electronic device is short-circuited and corroded to cause damage.
Besides physical waterproof, the electronic equipment can be judged whether water enters or not by detecting voltage partial pressure change at the water inlet based on an Analog-to-digital converter (ADC) of the equipment.
Due to the fact that the number of ADCs of the electronic equipment is limited, water inlet detection points cannot be arranged at multiple positions of the electronic equipment, and therefore water inlet detection of the electronic equipment is inaccurate.
Disclosure of Invention
The invention provides electronic equipment and a water inlet protection method, which are used for solving the problem that the detection of water inlet of the electronic equipment is inaccurate in the prior art.
In a first aspect, an embodiment of the present invention provides an electronic device, including: the water inlet detection circuit, the control circuit and the power supply for supplying power to the electronic equipment;
one end of the water inlet detection circuit is connected with at least one water inlet detection point, and the output end of the water inlet detection circuit is connected with the input end of the control circuit and used for outputting a level signal for representing the water inlet of the electronic equipment if a resistance value exists at the at least one water inlet detection point;
and the control end of the control circuit is connected with the power supply and is used for controlling the power supply to stop powering off the electronic equipment according to the level signal.
In one possible embodiment, the water ingress detection circuit includes: the voltage divider unit, the differential amplifier unit and the switch control unit;
the water inlet detection device comprises a differential amplification unit, a voltage division unit, a water inlet detection point and a water outlet detection point, wherein the voltage division unit is connected with a first power supply, a first output end of the voltage division unit is connected with a first input end of the differential amplification unit, a second output end of the voltage division unit is connected with a second input end of the differential amplification unit, and the voltage division unit is used for dividing an input voltage to obtain a divided first voltage and dividing the input voltage to obtain a divided second voltage according to a resistance value at the water inlet detection point;
the differential amplification unit is connected with a second power supply, the output end of the differential amplification unit is connected with the input end of the switch control unit, and the differential amplification unit is used for outputting a third voltage for controlling the switch control unit to be switched off according to the input first voltage and the input second voltage;
and the switch control unit is used for outputting the level signal according to the third voltage.
In one possible embodiment, the voltage dividing unit includes a first voltage dividing circuit and a second voltage dividing circuit;
the first voltage division circuit comprises a first resistor and a second resistor, wherein one end of the first resistor is connected with the first power supply, and the other end of the first resistor is connected with one end of the second resistor to serve as the first output end; the other end of the second resistor is grounded;
the second voltage division circuit comprises a third resistor and a fourth resistor, one end of the third resistor is connected with the first power supply, and the other end of the third resistor is respectively connected with one end of the fourth resistor and the at least one water inlet detection point to serve as a second output end; the other end of the fourth resistor is grounded.
In one possible embodiment, the differential amplifying unit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first transistor, and a second transistor;
one end of the fifth resistor is connected with one end of a seventh resistor and the second power supply respectively, and the other end of the fifth resistor is connected with the collector electrode of the first triode;
one end of the sixth resistor is connected with the emitting electrode of the first triode, and the other end of the sixth resistor is grounded;
the other end of the seventh resistor is connected with a collector of the second triode and serves as an output end of the differential amplification unit;
one end of the eighth resistor is connected with the emitting electrode of the second triode, and the other end of the eighth resistor is grounded;
the base electrode of the first triode is used as a first input end of the differential amplification unit;
and the base electrode of the second triode is used as the second input end of the differential amplification unit.
In one possible embodiment, the switch control unit includes a ninth resistor and a third transistor;
one end of the ninth resistor is connected with the first power supply, and the other end of the ninth resistor is connected with a collector of the third triode and used for outputting the level signal;
and the base electrode of the third triode is used for inputting the third voltage, and the emitting electrode of the third triode is grounded.
In one possible embodiment, the first resistor and the third resistor have the same resistance value, and the second resistor and the fourth resistor have the same resistance value.
In one possible embodiment, the fifth resistor and the seventh resistor have the same resistance value, and the sixth resistor and the eighth resistor have the same resistance value.
In one possible embodiment, the first transistor and the second transistor are MOS transistors.
In one possible embodiment, the fifth resistor, the seventh resistor and the ninth resistor have the same resistance.
In a second aspect, an embodiment of the present invention provides a water inlet protection method, including:
if the resistance value exists at least one water inlet detection point, determining that the output end of the water inlet detection circuit outputs a level signal for representing the water inlet of the electronic equipment;
and controlling a power supply to stop supplying power to the electronic equipment according to the level signal.
The embodiment of the invention provides electronic equipment and a water inlet protection method, wherein the electronic equipment comprises: the water inlet detection circuit comprises a water inlet detection circuit, a control circuit and a power supply, wherein one end of the water inlet detection circuit is connected with at least one water inlet detection point, the output end of the water inlet detection circuit is connected with the input end of the control circuit, and the control circuit is used for outputting a level signal for representing water inlet of the electronic equipment if the resistance value exists at the at least one water inlet detection point, and the control end of the control circuit is connected with the power supply and is used for controlling the power supply to stop supplying power to the electronic equipment according to the level signal. Because at least one water inlet detection point can be arranged, if the resistance value exists at the at least one water inlet detection point, the water inlet detection circuit outputs a level signal for representing the water inlet of the electronic equipment, so that the accuracy of the water inlet detection of the electronic equipment can be improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another electronic device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a water inlet detection circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a voltage dividing unit according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a differential amplifying unit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a switch control unit according to an embodiment of the present invention;
fig. 7 is a schematic flow chart of a water inlet protection method according to an embodiment of the present invention;
FIG. 8 is a simulation diagram according to an embodiment of the present invention;
FIG. 9 is a diagram of yet another simulation provided by an embodiment of the present invention;
fig. 10 is a diagram of another simulation provided in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, specific embodiments of an electronic device and a water inlet protection method according to embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are only for illustrating and explaining the present invention and are not to be used for limiting the present invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict. It should be noted that the shapes of the various figures in the drawings are not to scale and are intended to illustrate the invention. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
Fig. 1 shows a schematic structural diagram of an electronic device 100. The following describes an embodiment specifically by taking the electronic device 100 as an example. It should be understood that the electronic device 100 shown in fig. 1 is merely an example, and that the electronic device 100 may have more or fewer components than shown in fig. 1, may combine two or more components, or may have a different configuration of components. The various components shown in fig. 1 may be implemented in hardware, software, or a combination of hardware and software, including one or more signal processing and/or application specific integrated circuits.
A hardware configuration block diagram of an electronic device 100 according to exemplary embodiment 1 is exemplarily shown in fig. 1. As shown in fig. 1, the electronic device 100 includes: radio Frequency (RF) circuit 110, memory 120, display 130, camera 140, sensor 150, audio circuit 160, audio playing component 170, Wireless Fidelity (Wi-Fi) module 180, processor 190, bluetooth module 1100, power supply 1200, control circuit 1201, and water ingress detection circuit 1202.
The RF circuit 110 may be used for receiving and transmitting signals during information transmission and reception or during a call, and may receive downlink data from the server and then send the data to the processor 190 for processing; upstream data may be sent to the server. In general, RF circuit 110 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.
The memory 120 may be used to store software programs and data. The processor 190 performs various functions of the electronic device 100 and data processing by executing software programs or data stored in the memory 120. The memory 120 may include high speed random access memory and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. The memory 120 stores an operating system that enables the electronic device 100 to operate. The memory 120 may store an operating system and various application programs, and may also store codes for performing the methods described in the embodiments of the present application.
The display 130 may be used to receive input numeric or character information and generate signal inputs related to user settings and function control of the terminal 100, and particularly, the display 130 may include a touch screen 1301 disposed on the front surface of the electronic device 100 and capable of collecting touch operations of a user thereon or nearby, such as clicking a button, dragging a scroll box, and the like.
The touch screen 1301 may cover the display screen 1302, or the touch screen 1301 and the display screen 1302 may be integrated to implement the input and output functions of the electronic device 100, and after the integration, the touch screen may be referred to as a touch display screen for short. In the present application, the display 130 may display the application programs and the corresponding operation steps.
The camera 140 may be used to capture still images or video. The object generates an optical image through the lens and projects the optical image to the photosensitive element. The photosensitive element may be a Charge Coupled Device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor. The light sensing elements convert the light signals into electrical signals which are then passed to processor 190 for conversion into digital image signals.
The electronic device 100 may further comprise at least one sensor 150, such as an acceleration sensor 151, a distance sensor 152, a fingerprint sensor 153, a temperature sensor 154. The electronic device 100 may also be configured with other sensors such as gyroscopes, barometers, hygrometers, thermometers, infrared sensors, light sensors, motion sensors, and the like.
The audio circuitry 160 and the audio playback component 170 may provide an audio interface between a user and the electronic device 100. The audio circuit 160 may transmit the electrical signal converted from the received audio data to the speaker 171, and convert the electrical signal into a sound signal by the speaker 171 for output. The electronic device 100 may also be configured with a volume button for adjusting the volume of the sound signal. On the other hand, the microphone 172 converts the collected sound signals into electrical signals, converts the electrical signals into audio data after being received by the audio circuit 160, and outputs the audio data to the RF circuit 110 to be transmitted to, for example, another terminal or outputs the audio data to the memory 120 for further processing. In the present application, the microphone 172 may capture the voice of the user.
Wi-Fi belongs to short-range wireless transmission technology, and the electronic device 100 can help a user send and receive e-mails, browse webpages, access streaming media and the like through the Wi-Fi module 180, and provides wireless broadband Internet access for the user.
The processor 190 is a control center of the electronic device 100, connects various parts of the entire terminal using various interfaces and lines, and performs various functions of the electronic device 100 and processes data by running or executing software programs stored in the memory 120 and calling data stored in the memory 120. In some embodiments, processor 190 may include one or more processing units; processor 190 may also integrate an application processor, which primarily handles operating systems, user interfaces, and applications, etc., with a baseband processor, which primarily handles wireless communications. It will be appreciated that the baseband processor described above may not be integrated into processor 190. In the present application, the processor 190 may run an operating system, an application program, a user interface display, and a touch response, and the processing method described in the embodiments of the present application. Additionally, processor 190 is coupled to display 130.
The bluetooth module 1100 is used for performing information interaction with other bluetooth devices having the bluetooth module through a bluetooth protocol. For example, the electronic device 100 may establish a bluetooth connection with a wearable electronic device (e.g., a smart watch) that is also equipped with a bluetooth module via the bluetooth module 1100, so as to perform data interaction.
The electronic device 100 also includes a power supply 1200 (such as a battery) that powers the various components. The power supply may be logically coupled to processor 190 through a power management system to manage charging, discharging, and power consumption functions through the power management system. The electronic device 100 may further be configured with a power button for powering on and off the terminal, and locking the screen.
The electronic device 100 further includes a control circuit 1201, and the control circuit 1201 receives the level signal sent by the water inlet detection circuit 1202, so as to control the power supply 1200 to stop supplying power to the electronic device 100.
The water inlet detection circuit 1202 determines whether a resistance exists at the water inlet detection point, and if so, outputs a level signal for representing water inlet of the electronic device.
The control circuit 1201 in the electronic device 100 shown in fig. 1 may be the processor 190 or may be a single control circuit. If the control circuit 1201 is the processor 190, the water inlet detection circuit 1202 is connected to the processor 190, the output level signal is sent to the processor 190, and the processor 190 receives the level signal for representing the water inlet of the electronic device and then controls the power supply 1200 to stop supplying power to the electronic device.
The following provides a detailed description of embodiments of the invention.
An embodiment of the present invention provides an electronic device, as shown in fig. 2, which may include: the water inlet detection circuit 10, the control circuit 20 and the power supply 30 for supplying power to the electronic equipment;
one end of the water inlet detection circuit 10 is connected with at least one water inlet detection point, and the output end of the water inlet detection circuit is connected with the input end of the control circuit, and is used for outputting a level signal for representing water inlet of the electronic equipment if a resistance value exists at the at least one water inlet detection point;
the control terminal of the control circuit 20 is connected to the power supply 30, and is configured to control the power supply 30 to stop supplying power to the electronic device according to the level signal.
The electronic device provided by the embodiment of the invention comprises a water inlet detection circuit 10, a control circuit 20 and a power supply 30, wherein one end of the water inlet detection circuit 10 is connected with at least one water inlet detection point, the output end of the water inlet detection circuit is connected with the input end of the control circuit 20, the control circuit is used for outputting a level signal for representing water inlet of the electronic device if a resistance value exists at the at least one water inlet detection point, and the control end of the control circuit 20 is connected with the power supply 30 and is used for controlling the power supply 30 to stop supplying power to the electronic device according to the level signal. Because at least one water inlet detection point can be arranged, if the resistance value exists at the at least one water inlet detection point, the water inlet detection circuit outputs a level signal for representing the water inlet of the electronic equipment, so that the accuracy of the water inlet detection of the electronic equipment can be improved.
According to the embodiment of the invention, the resistance of water measured at the water inlet detection point is between 400K omega and 1M omega according to different water qualities, namely the resistance to the ground when water exists at the water inlet detection point. And judging whether the electronic equipment enters water or not through the resistance value change at the water inlet detection point.
In the implementation, there may be a plurality of water inlet detection points, as shown in fig. 2, there are N water inlet detection points. The plurality of water inlet detection points can be arranged at different positions of the electronic equipment, such as a charging interface, an earphone port, a shell gap, a display screen edge and the like.
The water inlet detection points are arranged at different positions of the electronic equipment, so that the accuracy of water inlet detection can be improved.
In a specific implementation, as shown in fig. 3, the water inlet detection circuit 10 may include a voltage dividing unit 101, a differential amplifying unit 102, and a switch control unit 103;
the voltage dividing unit 101 may be connected to the first power supply, a first output terminal of the voltage dividing unit 101 is connected to a first input terminal of the differential amplifying unit 102, and a second output terminal of the voltage dividing unit 101 is connected to a second input terminal of the differential amplifying unit 102, so as to divide the input voltage to obtain a divided first voltage, and divide the input voltage to obtain a divided second voltage according to a resistance value of at least one water inlet detection point.
The differential amplification unit 102 is connected with the second power supply, and an output end of the differential amplification unit 102 is connected with an input end of the switch control unit 103, and is used for outputting a third voltage for controlling the switch control unit to be turned off according to the input first voltage and the input second voltage;
and the switch control unit 103 is used for outputting a level signal for representing water inflow of the electronic equipment according to the third voltage.
In this embodiment of the present invention, the differential amplifying unit 102 may output a third voltage according to a voltage difference between the first voltage and the second voltage.
The differential amplifying unit 102 may generate the third voltage, which is turned off by the switching control unit, even though the voltage difference between the first voltage and the second voltage is small, through amplification, so that the accuracy of the water inlet detection may be improved.
In one possible implementation, as shown in fig. 4, the voltage dividing unit 101 may include a first voltage dividing circuit 1010 and a second voltage dividing circuit 1012;
the first voltage dividing circuit 1010 may include a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the first power supply, the other end of the first resistor R3526 is connected to one end of the second resistor R2, and the other end of the first resistor R1 serves as a first output terminal of the voltage dividing unit 101; the other end of the second resistor R2 is grounded;
the second voltage dividing circuit may include a third resistor R3 and a fourth resistor R4, one end of the third resistor R3 is connected to the first power supply, and the other end is connected to one end of the fourth resistor and the at least one water inlet detection point, respectively, and the other end of the third resistor R3 is used as a second output terminal of the voltage dividing unit 101; the other end of the fourth resistor R4 is grounded.
In practice, the first resistor R1 and the third resistor R3 may have the same resistance, and the second resistor R2 and the fourth resistor R4 may have the same resistance.
The first resistor R1 and the third resistor R3 may be 400K Ω (ohm), and the second resistor R2 and the fourth resistor R4 may be 500K Ω.
The first power supply in embodiments of the present invention may be 1.8V.
In one possible implementation, as shown in fig. 5, the differential amplifying unit 102 may include a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first transistor Q1, and a second transistor Q2;
one end of the fifth resistor R5 is connected to one end of the seventh resistor R7 and the second power supply, respectively, and the other end is connected to the collector of the first triode Q1;
one end of the sixth resistor R6 is connected with the emitter of the first triode Q1, and the other end is grounded;
the other end of the seventh resistor R7 is connected to the collector of the second transistor Q2, and serves as the output end of the differential amplification unit 102;
one end of the eighth resistor R8 is connected with the emitter of the second triode Q2, and the other end of the eighth resistor R8 is grounded;
the base of the first triode Q1 is used as the first input terminal of the differential amplification unit 102;
the base of the second transistor Q2 serves as the second input terminal of the differential amplification unit 102.
In practice, the fifth resistor R5 and the seventh resistor R7 may have the same resistance value, which may be 10K Ω, and the sixth resistor R6 and the eighth resistor R8 may have the same resistance value, which may be 1K Ω.
In the embodiment of the present invention, the second power supply may be 3.3V, and the first transistor Q1 and the second transistor Q2 may be MOS transistors.
As can be seen from fig. 5, the differential amplifying unit in the embodiment of the present invention is a differential amplifying circuit, and outputs the third voltage according to the effect of the differential amplifying circuit on common mode voltage suppression and differential mode voltage amplification. That is, if the first voltage and the second voltage are the same, the output third voltage is 0, and if the first voltage and the second voltage are different, the output third voltage amplifies the first voltage and the second voltage and outputs the third voltage.
In one possible implementation, as shown in fig. 6, the switch control unit 103 may include a ninth resistor R9 and a third transistor Q3;
one end of the ninth resistor R9 is connected with the first power supply, and the other end is connected with the collector of the third triode Q3 and used for outputting a level signal;
the base of the third transistor Q3 is used for inputting the third voltage, and the emitter is grounded.
In the embodiment of the invention, if no water exists at the water inlet detection point, the first voltage and the second voltage output by the voltage dividing unit are the same, the differential amplification circuit inputs the first voltage and the second voltage, according to the suppression effect on the common-mode voltage, the third voltage input by the base of the Q3 is smaller than the switching voltage of the Q3, the Q3 is in a closed state, the output level signal is at a high level, the control unit determines that no water enters the electronic equipment after receiving the high level, and the control unit can control the power supply to supply power to the electronic equipment or does not do any action.
If water exists at the water inlet detection point, the first voltage and the second voltage output by the voltage division unit are different, the first voltage and the second voltage are input by the differential amplification circuit, the third voltage input by the base of the Q3 is greater than the switching voltage of the Q3 according to the amplification effect on the differential mode voltage, the Q3 is in a closed state, the output level signal is at a low level, the control unit determines that the electronic equipment is filled with water after receiving the low level, and the control unit controls the power supply to stop supplying power to the electronic equipment.
In a preferred embodiment, the resistances of the fifth resistor R5, the seventh resistor R7, and the ninth resistor R9 may be the same, 10K Ω.
In a specific implementation, the control circuit may be a main chip of the electronic device, and the level signal may be connected to a GPIO terminal of the main chip. The Q3 can be suitable for GPIOs of different power domains according to different pull-up power sources, so that the water inlet detection circuit is more universal.
In specific implementation, the electronic device may be: a mobile terminal. Such as a cell phone, tablet computer. Of course, the electronic device may also be any product or component having a function of storing and/or transmitting data, such as a mobile storage device, a digital camera, a video camera, a printer, and the like. Other essential components of the electronic device are understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present invention.
Based on the same inventive concept, an embodiment of the present invention further provides a water inlet protection method implemented by the present invention, as shown in fig. 7, which may include the following steps:
s701, if a resistance value exists at least one water inlet detection point, determining that the output end of the water inlet detection circuit outputs a level signal for representing water inlet of the electronic equipment;
and S702, controlling a power supply to stop supplying power to the electronic equipment according to the level signal.
According to the embodiment of the invention, when the resistance value at least one water inlet detection point is detected, the output end of the water inlet detection circuit is determined to output the level signal for representing the water inlet of the electronic equipment, and then the power supply is controlled to stop supplying power to the electronic equipment according to the level signal.
For ease of understanding, the present invention is described below in terms of specific examples.
Example 1:
using the simulation image, when the resistance value at the water inlet detection point is 0, that is, there is no water at the water inlet detection point, the water inlet detection circuit outputs a high level, as shown in fig. 8.
Example 2:
using the simulation image, when the resistance value at the water inlet detection point is 400K Ω, that is, there is water at the simulation water inlet detection point, the water inlet detection circuit outputs a low level, as shown in fig. 9.
Example 3:
using the simulation image, when the resistance value at the water inlet detection point is 1M Ω, that is, there is water at the simulation water inlet detection point, the water inlet detection circuit outputs a low level, as shown in fig. 10.
The present application is described above with reference to block diagrams and/or flowchart illustrations of methods, apparatus (systems) and/or computer program products according to embodiments of the application. It will be understood that one block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, and/or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, create means for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.
Accordingly, the subject application may also be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.). Furthermore, the present application may take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of this application, a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. An electronic device, comprising a water inlet detection circuit, a control circuit and a power supply for supplying power to the electronic device;
one end of the water inlet detection circuit is connected with at least one water inlet detection point, and the output end of the water inlet detection circuit is connected with the input end of the control circuit and used for outputting a level signal for representing the water inlet of the electronic equipment if a resistance value exists at the at least one water inlet detection point;
and the control end of the control circuit is connected with the power supply and is used for controlling the power supply to stop powering off the electronic equipment according to the level signal.
2. The electronic device of claim 1, wherein the water ingress detection circuit comprises: the voltage divider unit, the differential amplifier unit and the switch control unit;
the voltage dividing unit is connected with a first power supply, a first output end of the voltage dividing unit is connected with a first input end of the differential amplifying unit, a second output end of the voltage dividing unit is connected with a second input end of the differential amplifying unit, and the voltage dividing unit is used for dividing an input voltage to obtain a divided first voltage and dividing the input voltage to obtain a divided second voltage according to a resistance value of the at least one water inlet detection point;
the differential amplification unit is connected with a second power supply, the output end of the differential amplification unit is connected with the input end of the switch control unit, and the differential amplification unit is used for outputting a third voltage for controlling the switch control unit to be switched off according to the input first voltage and the input second voltage;
and the switch control unit is used for outputting the level signal according to the third voltage.
3. The electronic device according to claim 2, wherein the voltage dividing unit includes a first voltage dividing circuit and a second voltage dividing circuit;
the first voltage division circuit comprises a first resistor and a second resistor, wherein one end of the first resistor is connected with the first power supply, and the other end of the first resistor is connected with one end of the second resistor to serve as the first output end; the other end of the second resistor is grounded;
the second voltage division circuit comprises a third resistor and a fourth resistor, one end of the third resistor is connected with the first power supply, and the other end of the third resistor is respectively connected with one end of the fourth resistor and the at least one water inlet detection point to serve as a second output end; the other end of the fourth resistor is grounded.
4. The electronic device according to claim 2, wherein the differential amplification unit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first transistor, and a second transistor;
one end of the fifth resistor is connected with one end of a seventh resistor and the second power supply respectively, and the other end of the fifth resistor is connected with the collector electrode of the first triode;
one end of the sixth resistor is connected with the emitting electrode of the first triode, and the other end of the sixth resistor is grounded;
the other end of the seventh resistor is connected with a collector of the second triode and serves as an output end of the differential amplification unit;
one end of the eighth resistor is connected with the emitting electrode of the second triode, and the other end of the eighth resistor is grounded;
the base electrode of the first triode is used as a first input end of the differential amplification unit;
and the base electrode of the second triode is used as the second input end of the differential amplification unit.
5. The electronic device of claim 4, wherein the switch control unit includes a ninth resistor and a third transistor;
one end of the ninth resistor is connected with the first power supply, and the other end of the ninth resistor is connected with a collector of the third triode and used for outputting the level signal;
and the base electrode of the third triode is used for inputting the third voltage, and the emitting electrode of the third triode is grounded.
6. The electronic device of claim 3, wherein the first resistor and the third resistor are the same resistance value, and the second resistor and the fourth resistor are the same resistance value.
7. The electronic device according to claim 4, wherein the fifth resistor and the seventh resistor have the same resistance value, and the sixth resistor and the eighth resistor have the same resistance value.
8. The electronic device of claim 4, wherein the first transistor and the second transistor are MOS transistors.
9. The electronic device according to claim 5, wherein the fifth resistor, the seventh resistor, and the ninth resistor have the same resistance value.
10. A method of water ingress protection, comprising:
if the resistance value exists at least one water inlet detection point, determining that the output end of the water inlet detection circuit outputs a level signal for representing the water inlet of the electronic equipment;
and controlling a power supply to stop supplying power to the electronic equipment according to the level signal.
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| CN202011052829.8A CN112103917A (en) | 2020-09-29 | 2020-09-29 | Electronic equipment and water inlet protection method |
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| CN202011052829.8A CN112103917A (en) | 2020-09-29 | 2020-09-29 | Electronic equipment and water inlet protection method |
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