CN114236240B - Liquid inlet detection circuit and electronic equipment - Google Patents
Liquid inlet detection circuit and electronic equipment Download PDFInfo
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- CN114236240B CN114236240B CN202210173863.3A CN202210173863A CN114236240B CN 114236240 B CN114236240 B CN 114236240B CN 202210173863 A CN202210173863 A CN 202210173863A CN 114236240 B CN114236240 B CN 114236240B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/028—Circuits therefor
Abstract
The application provides a liquid inlet detection circuit and electronic equipment, wherein the detection circuit comprises: the device comprises an impedance detection module and a processing module, wherein the impedance detection module is used for: detecting a first impedance and a second impedance, wherein the first impedance is the impedance between a first data pin and a GND pin in the Type-C interface, and the second impedance is the impedance between a second data pin and the GND pin in the Type-C interface; the processing module is used for: and when at least one of the first impedance and the second impedance is smaller than a preset reference impedance, judging that the Type-C interface has a liquid inlet problem. The application can reduce the corrosion phenomenon of the pins in the Type-C interface, and prolong the service life and the service performance of the Type-C interface.
Description
Technical Field
The application relates to the technical field of charge and discharge, in particular to a liquid inlet detection circuit and electronic equipment.
Background
Many electronic devices interface with a Type-C interface for charging and/or data transfer. At present, certain pins in the Type-C interface, particularly CC pins, can generate corrosion phenomena after being used for a period of time, so that the service life and the service performance of the Type-C interface are affected.
Disclosure of Invention
The application provides a liquid inlet detection circuit and electronic equipment, which can reduce the corrosion phenomenon of pins in a Type-C interface and prolong the service life and the service performance of the Type-C interface.
In a first aspect, an embodiment of the present application provides a Type-C interface liquid inlet detection circuit, which is applied to an electronic device, where the electronic device includes a Type-C interface, and the detection circuit includes: the impedance detection module and the processing module are used for detecting the impedance of the electronic device, wherein,
the impedance detection module is used for: detecting a first impedance and a second impedance, wherein the first impedance is the impedance between a first data pin and a GND pin in the Type-C interface, and the second impedance is the impedance between a second data pin and the GND pin in the Type-C interface;
the processing module is used for: and when at least one of the first impedance and the second impedance is smaller than a preset reference impedance, judging that the Type-C interface has a liquid inlet problem.
According to the circuit, liquid inlet detection of the Type-C interface is realized through detection of the first impedance and/or the second impedance, so that the detection sensitivity is relatively higher, the condition of a small amount of liquid inlet of the Type-C interface is detected more easily, the corrosion phenomenon of pins in the Type-C interface can be reduced, and the service life and the service performance of the Type-C interface are prolonged.
In one possible implementation, to detect the first impedance and the second impedance, the impedance detection module is specifically configured to: executing the first number of times of detection of the first impedance and the second impedance to obtain a first number of times of detection results;
in order to determine that the Type-C interface has a liquid inlet problem when at least one of the first impedance and the second impedance is smaller than a preset reference impedance, the processing module is specifically configured to: when the detection results of the first number of times have the detection results of the second number of times to meet the preset conditions, judging that the Type-C interface has the liquid inlet problem, wherein the preset conditions comprise: at least one of the first impedance and the second impedance is less than a preset reference impedance.
In one possible implementation, to detect the first impedance and the second impedance, the impedance detection module is specifically configured to: a magnitude relation between the first impedance and a preset reference impedance is detected, and a magnitude relation between the second impedance and the preset reference impedance is detected.
In one possible implementation manner, to detect a magnitude relation between the first impedance and a preset reference impedance, and to detect a magnitude relation between the second impedance and the preset reference impedance, the impedance detection module is specifically configured to: a magnitude relation between the voltage of the first data pin and a preset reference voltage is detected, and a magnitude relation between the voltage of the second data pin and the preset reference voltage is detected.
In one possible implementation, the impedance detection module includes: a first resistor, a second resistor, a first comparator, a second comparator, a first switch, an OR gate, and a reference voltage supply circuit; wherein, the liquid crystal display device comprises a liquid crystal display device,
the first end of the impedance detection module is used for connecting with a CC1 pin, and the second end is used for connecting with a CC2 pin;
the first end of the impedance detection module is connected with the first end of the first switch through a first resistor and is also connected with the first end of the first comparator;
the second end of the impedance detection module is connected with the first end of the first switch through a second resistor and is also connected with the first end of the second comparator;
the second end of the first comparator and the second end of the second comparator are respectively connected with the output end of the reference voltage providing circuit, and the reference voltage providing circuit is used for outputting reference voltage;
the output end of the first comparator is correspondingly connected with the first end and the second end of the OR gate respectively;
the output end of the OR gate is connected with the control end of the first switch;
the second end of the first switch is connected with the first voltage end, the third end of the first switch is connected with the second voltage end, and the voltage of the first voltage end is different from the voltage of the second voltage end;
the control terminal of the first switch is used for controlling the first switch to gate the passage between the first terminal and the third terminal.
In one possible implementation, the reference voltage supply circuit includes: a third resistor and a fourth resistor, wherein,
the first end of the reference voltage supply circuit is connected with the first end of the first switch;
the first end of the reference voltage supply circuit is grounded through a third resistor and a fourth resistor which are connected in series.
In one possible implementation manner, the third resistor, the first resistor, and the second resistor have the same resistance, and the resistance of the fourth resistor is equal to the preset reference resistance.
In one possible implementation, the first end of the impedance detection module is connected to the first end of the first switch through a first resistor, including: the first end of the impedance detection module is connected with the first end of the first switch through a first resistor and a second switch which are connected in series, and the control end of the second switch is connected with the processing module;
the second end of impedance detection module passes through the first end of second resistance connection first switch, includes: the second end of the impedance detection module is connected with the first end of the first switch through a second resistor and a third switch which are connected in series, and the control end of the third switch is connected with the processing module;
the processing module is also used for: and when the detection of the advancing liquid is determined, the second switch and the third switch are controlled to be turned on.
In one possible implementation, the first data pin and the second data pin are CC pins.
In a second aspect, an embodiment of the present application provides an electronic device, including: type-C interface and the feed liquor detection circuit of any one of the first aspect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a CC pin being corroded in a Type-C interface;
FIG. 2 is a schematic diagram of a Type-C interface;
FIG. 3 is a schematic diagram of an embodiment of a liquid inlet detection circuit according to the present application;
fig. 4 is a schematic structural diagram of another embodiment of the liquid inlet detection circuit of the present application.
Detailed Description
The terminology used in the description of the embodiments of the application herein is for the purpose of describing particular embodiments of the application only and is not intended to be limiting of the application.
Many electronic devices interface with a Type-C interface for charging and/or data transfer. At present, some pins in the Type-C interface, particularly the CC pins, may have corrosion phenomena after a period of use, see the CC pins shown in fig. 1, and due to the corrosion, the service life, the service performance, etc. of the Type-C interface, particularly the CC pins, may be affected, so that the user experience is further affected.
Through researches, one reason for the corrosion phenomenon of the CC pins is that liquid inlet condition occurs in the Type-C interface, namely that liquid enters the Type-C interface. Fig. 2 shows a schematic diagram of the pin structure of the Type-C interface. When the Type-C interface is used as a charging interface of an electronic device (for example, a mobile phone), under the uncharged condition, if the Type-C interface has a liquid inlet, the CC pin of the Type-C interface still has voltage under the uncharged condition, so that the corrosion phenomenon of the CC pin can be caused or aggravated.
In order to reduce corrosion of CC pin and other problems that the feed liquor probably causes in the Type-C interface, can advance liquid detection to the Type-C interface, detect whether there is liquid in the Type-C interface promptly. In one example, the Type-C interface liquid inlet detection scheme includes: providing voltage for the CC pin to detect impedance between the CC pin and the GND pin, providing voltage for the SBU pin to detect impedance between the SBU pin and the GND pin if the impedance is between 10KΩ and 1MΩ, judging that the Type-C interface is in the range of 50KΩ if the impedance between the SBU pin and the GND pin is in the range of 50KΩ, stopping providing voltage for the CC pin and the SBU pin, and providing voltage for the CC pin and the SBU pin all the time if the impedance between the SBU pin and the GND pin is not in the range of 50KΩ, and detecting impedance between the SBU pin and the GND pin.
However, in this scheme, the impedance between the CC pin and the GND pin and the impedance between the SBU pin and the GND pin all meet the conditions, so that the Type-C interface liquid inlet can be determined, that is, the liquid inlet needs to exist between the CC pin and the GND pin and between the SBU pin and the GND pin, so that the Type-C interface liquid inlet can be determined. However, in combination with the structure of the Type-C interface shown in fig. 2, a certain distance exists between the CC pins (CC 1 and CC 2) and the SBU pins (SBU 1 and SBU 2), so that the above detection scheme has relatively severe requirements on the condition of determining the liquid inlet, and can only be detected when a relatively large amount of liquid inlet exists in the Type-C interface. If the Type-C interface enters a small amount of liquid, for example, the liquid is only at a certain CC pin and GND pin, but no liquid exists between the SBU pin and GND pin, the above-mentioned liquid inlet detection scheme cannot detect the Type-C interface liquid inlet, and then the CC pin is still detected by the liquid inlet running by applying voltage, which further aggravates the corrosion of the CC pin.
Therefore, the liquid inlet detection circuit and the electronic device of the Type-C interface can reduce the corrosion phenomenon of the CC pins in the Type-C interface and improve user experience.
FIG. 3 is a schematic diagram of an embodiment of the liquid inlet detection circuit according to the present application, as shown in FIG. 3, including: an impedance detection module 310 and a processing module 320; wherein, the liquid crystal display device comprises a liquid crystal display device,
the first terminal X1 of the impedance detection module 310 is connected to the CC1 pin, the second terminal X2 is connected to the CC2 pin, and the third terminal X3 is connected to the input terminal Y1 of the processing module 320.
The impedance detection module 310 may be configured to: the impedance between the CC1 pin and the GND pin, and/or the impedance between the CC2 pin and the GND pin is detected, and the detection result is transmitted to the processing module 320. For convenience of description, the impedance between the CC1 pin and the GND pin is hereinafter referred to as a first impedance, and the impedance between the CC2 pin and the GND pin is referred to as a second impedance.
The processing module 320 may be configured to: when the first impedance is smaller than the preset reference impedance and/or the second impedance is smaller than the preset reference impedance, determining that the Type-C interface generates liquid inlet; otherwise, determining that no liquid inlet occurs in the Type-C interface.
It should be noted that, in order to improve the sensitivity and the detection rate of the liquid inlet detection circuit, the impedance detection module 310 may detect both the first impedance and the second impedance, so that the liquid inlet detection circuit of the present application can detect the liquid inlet at both sides of the Type-C interface.
In the circuit shown in fig. 3, the liquid inlet detection of the Type-C interface is realized by detecting the first impedance and/or the second impedance, so that the detection sensitivity is relatively higher, and the condition of a small amount of liquid inlet of the Type-C interface is easier to detect.
In another embodiment provided by the present application, the impedance detection module 310 in the circuit shown in fig. 3 may be specifically configured to: detecting a magnitude relation between the first impedance and the reference impedance, and/or detecting a magnitude relation between the second impedance and the reference impedance; accordingly, the detection result sent by the impedance detection module 310 to the processing module 320 is: a magnitude relation between the first impedance and the reference impedance, and/or a magnitude relation between the second impedance and the reference impedance.
Alternatively, the above-mentioned detection of the magnitude relation between the two impedances may further be achieved by detecting the magnitude relation between the two voltages. At this time, the impedance detection module 310 may specifically be configured to: detecting a magnitude relation between the CC1 pin and a reference voltage, and/or detecting a magnitude relation between the CC2 pin and the reference voltage; accordingly, and accordingly, the detection result sent by the impedance detection module 310 to the processing module 320 is: a magnitude relationship between the CC1 pin and a reference voltage, and/or a magnitude relationship between the CC2 pin and a reference voltage.
To further increase accuracy of the liquid inlet detection, in one embodiment, the impedance detection module 310 may detect the first impedance and the second impedance n1 times, so as to obtain n1 detection results; in a corresponding manner,
the processing module 320 may determine that the Type-C interface is subjected to liquid feeding when n2 detection results out of the n1 detection results satisfy the condition that the first impedance is smaller than the preset reference impedance and/or the second impedance is smaller than the preset reference impedance. n1 is a natural number greater than 1, and n2 is a natural number.
In the embodiment, whether liquid inlet occurs in the Type-C interface is determined in a mode of filtering the multiple detection results, so that the accuracy of liquid inlet detection is improved.
Fig. 4 is a schematic diagram of an embodiment of an impedance detection circuit 310 in the liquid inlet detection circuit according to the present application, and fig. 4 further provides a possible implementation structure of the impedance detection circuit based on the circuit shown in fig. 3. As shown in fig. 4, the impedance detection circuit 310 may include:
the first input terminal IN1 of the first switch S1 is connected to the first voltage terminal V1, and the second input terminal IN2 is connected to the second voltage terminal V2, wherein the voltage of the first voltage terminal V1 is different from the voltage of the second voltage terminal V2. For example, the voltage of the first voltage terminal V1 may be 1.8V, and the voltage of the second voltage terminal V2 may be a system voltage, for example, 5V.
The output end OUT of the first switch S1 is grounded through a third resistor R3 and a fourth resistor R4 which are connected in series, and is also connected with the first end X1 of the impedance detection circuit 310 through the first resistor R1 and the second switch S2 which are connected in series, and is also connected with the second end X2 of the impedance detection circuit 310 through the second resistor R2 and the third switch S3 which are connected in series;
the first terminal X1 of the impedance detection circuit 310 (i.e. the terminal connected to the CC1 pin of the Type-C interface) is connected to the inverting input terminal of the first comparator A1;
the second terminal X2 of the impedance detection circuit 310 (i.e. the terminal connected to the CC2 pin of the Type-C interface) is connected to the inverting input terminal of the second comparator A2;
the non-inverting input end of the first comparator A1 and the non-inverting input end of the second comparator A2 are connected with one end of the fourth resistor R4 which is not grounded;
the output end of the first comparator A1 and the output end of the second comparator A2 are correspondingly connected with 2 input ends of the OR gate respectively;
the output end of the or gate is connected to the switch control end of the first switch S1 through a buffer, and is also connected to the third end X3 of the impedance detection module 310.
Alternatively, the enabling terminal of the first switch S1 may be connected to the processing module 320 (not shown in fig. 4), and the enabling control is performed by the processing module 320. When the impedance detection module 310 is required to operate, the processing module 320 controls the first switch S1 to operate, and when the impedance detection module 310 is not required to operate, the first switch S1 is controlled to not operate.
Alternatively, the control end of the second switch S2 and the control end of the third switch S3 may be respectively connected to the processing module 320 (not shown in fig. 4), and the processing module 320 performs on-off control, so that when the processing module 320 needs the impedance detection module to operate, the second switch S2 and the third switch S3 are controlled to be turned on, and when the processing module 320 does not need the impedance detection module to operate, the second switch S2 and the third switch S3 are controlled to be turned off. The second switch S2 and the third switch S3 may be implemented by switching transistors, respectively.
Alternatively, the resistances of the first resistor R1, the second resistor R2, and the third resistor R3 may be the same, and the resistance of the fourth resistor R4 may be equal to the reference resistance.
The implementation principle of the impedance detection module in fig. 4 is explained below.
The first switch S1 gates a path between the first input terminal IN1 and the output terminal OUT IN an initial state, and the first voltage terminal V1 provides power;
the first comparator A1 compares the voltage of the CC1 pin with the reference voltage, if the voltage of the CC1 pin is lower than the reference voltage, the first comparator A1 outputs a high level when indicating that liquid exists between the CC1 pin and the GND pin, otherwise, the first comparator A1 outputs a low level when indicating that no liquid exists between the CC1 pin and the GND pin;
the second comparator A2 compares the voltage of the CC2 pin with the reference voltage, if the voltage of the CC2 pin is lower than the reference voltage, the second comparator A2 outputs a high level, otherwise, the second comparator A2 outputs a low level, if no liquid exists between the CC2 pin and the GND pin;
when at least 1 comparator of the first comparator A1 and the second comparator A2 outputs a high level, the OR gate outputs a high level;
the high level output by the OR gate is processed by the buffer and then output to the switch control end SW of the first switch S1, the first switch S1 cuts off the passage between the first input end IN1 and the output end OUT, the passage between the second input end IN2 and the output end OUT is gated, and the second voltage end V2 provides electric energy;
because the voltages of the first voltage terminal V1 and the second voltage terminal V2 are different, when the first voltage terminal V1 provides electric energy and the second voltage terminal V2 provides electric energy, the input terminal Y1 of the processing module 320 receives the high-level signal, but the voltage values of the received high-level signal are different, and the processing module 320 can determine whether the voltage of the CC1 pin and the voltage of the CC2 pin are lower than the reference voltage according to the specific voltage values of the received voltage signals, that is, determine whether at least 1 impedance of the first impedance and the second impedance is lower than the reference impedance, so as to determine whether the liquid intake occurs.
Alternatively, the processing module 320 may be a processor of an electronic device (e.g., a cell phone).
Alternatively, the processing module 320 may disconnect the voltage provided to the CC pin when it determines that an ingress has occurred, thereby preventing corrosion of the CC pin from being exacerbated by the presence of the voltage on the CC pin.
It should be noted that, in the above embodiment, the CC pin may be replaced by another data pin, for example, an SBU pin, that is, the impedance between the SBU pin and the GND pin is detected to detect the running liquid, which is not limited by the embodiment of the present application.
The application further provides electronic equipment comprising the Type-C interface and the liquid inlet detection circuit provided by any one of the embodiments.
In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relation of association objects, and indicates that there may be three kinds of relations, for example, a and/or B, and may indicate that a alone exists, a and B together, and B alone exists. Wherein A, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of the following" and the like means any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c may represent: a, b, c, a and b, a and c, b and c or a and b and c, wherein a, b and c can be single or multiple.
The foregoing is merely exemplary embodiments of the present application, and any person skilled in the art may easily conceive of changes or substitutions within the technical scope of the present application, which should be covered by the present application. The protection scope of the present application shall be subject to the protection scope of the claims.
Claims (6)
1. The utility model provides a feed liquor detection circuitry, is applied to electronic equipment, electronic equipment includes Type-C interface, its characterized in that, detection circuitry includes: the impedance detection module and the processing module are used for detecting the impedance of the electronic device, wherein,
the impedance detection module is used for: detecting a magnitude relation between a first impedance and a preset reference impedance and detecting a magnitude relation between a second impedance and a preset reference impedance when the electronic device is not charged through the Type-C interface and provides voltages for a first CC pin in the Type-C interface and a second CC pin in the Type-C interface, wherein the first impedance is an impedance between the first CC pin in the Type-C interface and a GND pin in the Type-C interface, and the second impedance is an impedance between the second CC pin in the Type-C interface and a GND pin in the Type-C interface;
the processing module is used for: when at least one of the first impedance and the second impedance is smaller than a preset reference impedance, judging that the Type-C interface has a liquid inlet problem, and disconnecting the voltages provided for the first CC pin and the second CC pin;
the impedance detection module is specifically configured to detect a magnitude relation between a first impedance and a preset reference impedance, and detect a magnitude relation between a second impedance and the preset reference impedance:
executing the first number of times to detect the magnitude relation between the first impedance and the preset reference impedance and the magnitude relation between the second impedance and the preset reference impedance to obtain a first number of times of detection results;
in order to determine that the Type-C interface has a liquid inlet problem when at least one of the first impedance and the second impedance is smaller than a preset reference impedance, the processing module is specifically configured to:
when the detection results of the first number of times have the detection results of the second number of times to meet the preset condition, judging that the Type-C interface has the liquid inlet problem, wherein the preset condition comprises the following steps: at least one of the first impedance and the second impedance is smaller than a preset reference impedance;
in order to detect a magnitude relation between the first impedance and a preset reference impedance and a magnitude relation between the second impedance and the preset reference impedance, the impedance detection module is specifically configured to:
detecting the magnitude relation between the voltage of a first CC pin and a preset reference voltage, detecting the magnitude relation between the voltage of a second CC pin and the preset reference voltage, determining that the first impedance is smaller than the preset reference impedance when the voltage of the first CC pin is smaller than the preset reference voltage, and determining that the second impedance is smaller than the preset reference impedance when the voltage of the second CC pin is smaller than the preset reference voltage.
2. The circuit of claim 1, wherein the impedance detection module comprises: a first resistor, a second resistor, a first comparator, a second comparator, a first switch, an OR gate, and a reference voltage supply circuit; wherein, the liquid crystal display device comprises a liquid crystal display device,
the first end of the impedance detection module is used for being connected with the first CC pin, and the second end of the impedance detection module is used for being connected with the second CC pin;
the first end of the impedance detection module is connected with the first end of the first switch through a first resistor and is also connected with the first end of the first comparator;
the second end of the impedance detection module is connected with the first end of the first switch through a second resistor and is also connected with the first end of the second comparator;
the second end of the first comparator and the second end of the second comparator are respectively connected with the output end of the reference voltage providing circuit, and the reference voltage providing circuit is used for outputting reference voltage;
the output end of the first comparator is correspondingly connected with the first end and the second end of the OR gate respectively;
the output end of the OR gate is connected with the control end of the first switch;
the second end of the first switch is connected with a first voltage end, the third end of the first switch is connected with a second voltage end, and the voltage of the first voltage end is different from the voltage of the second voltage end;
the control end of the first switch is used for controlling the first switch to gate a passage between the first end and the third end.
3. The circuit of claim 2, wherein the reference voltage supply circuit comprises: a third resistor and a fourth resistor, wherein,
a first end of the reference voltage supply circuit is connected with a first end of the first switch;
the first end of the reference voltage supply circuit is grounded through the third resistor and the fourth resistor which are connected in series.
4. A circuit according to claim 3, wherein the third resistor, the first resistor and the second resistor have the same resistance, and the fourth resistor has an impedance equal to the predetermined reference impedance.
5. The circuit of claim 2, wherein the first terminal of the impedance detection module is connected to the first terminal of the first switch through a first resistor, comprising: the first end of the impedance detection module is connected with the first end of the first switch through a first resistor and a second switch which are connected in series, and the control end of the second switch is connected with the processing module;
the second end of the impedance detection module is connected with the first end of the first switch through a second resistor, and the impedance detection module comprises: the second end of the impedance detection module is connected with the first end of the first switch through a second resistor and a third switch which are connected in series, and the control end of the third switch is connected with the processing module;
the processing module is further configured to: and when the detection of the advancing liquid is determined, the second switch and the third switch are controlled to be conducted.
6. An electronic device, comprising: type-C interface, and a liquid inlet detection circuit as claimed in any one of claims 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210173863.3A CN114236240B (en) | 2022-02-25 | 2022-02-25 | Liquid inlet detection circuit and electronic equipment |
| CN202211129270.3A CN115575452B (en) | 2022-02-25 | 2022-02-25 | Liquid inlet detection circuit and electronic equipment |
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| CN202210173863.3A CN114236240B (en) | 2022-02-25 | 2022-02-25 | Liquid inlet detection circuit and electronic equipment |
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| CN115575452B (en) | 2024-03-26 |
| CN114236240A (en) | 2022-03-25 |
| CN115575452A (en) | 2023-01-06 |
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