USB protection circuit and protection device capable of preventing liquid short circuit

Abstract

The utility model provides a USB protection circuit and device for preventing liquid short circuit, and relates to the technical field of electronic circuit protection, and the circuit comprises a current detection module which is connected with a USB data channel line, and is used for detecting the current of the USB data channel line; the comparator module is connected with the current detection module and generates an INT signal according to the returned current; the feedback prompt module is connected with the USB data channel line; the logic control module is used for receiving the INT signal output by the comparator module; the first output end of the logic control module is connected with the feedback prompt module and outputs an INT signal to the feedback prompt module; and the power management module is connected with the second output end of the logic control module and is used for stopping power supply to the Type-c connector. The technical problems that in the prior art, a USB interface is prone to short circuit, unstable in data transmission and even damaged under the condition of liquid invasion are solved, and the technical effect of improving the safety of the USB interface and the stability of the equipment is achieved.

Description

Technical Field

[0001] This application belongs to the field of electronic circuit protection technology, specifically relating to a USB protection circuit and protection device for preventing liquid short circuits. Background Technology

[0002] In the field of electronic devices, USB interfaces are widely used in various devices such as mobile phones, tablets, chargers, and laptops. However, the stability and reliability of USB interfaces have become pressing technical challenges to be addressed in humid environments, rain, and when users have sweaty hands. These environmental conditions often cause the metal contact points of the USB interface to be corroded by liquids, leading to short circuits, affecting power supply and data transmission, and even causing the USB interface to fail directly.

[0003] In existing technologies, most USB interfaces lack effective liquid protection measures. Liquid can easily seep into the internal circuitry through the interface, causing short circuits between the positive and negative data lines or between the power supply and ground. This not only poses risks of poor contact and short circuits but may also cause the device to malfunction or suffer permanent damage. Therefore, there is an urgent need for a USB protection circuit that can prevent liquid intrusion and promptly cut off power upon detecting liquid, ensuring the USB interface maintains good stability and reliability even in harsh environments. Utility Model Content

[0004] This application provides a USB protection circuit and device to prevent liquid short circuits, which solves the technical problem in the prior art that USB interfaces are prone to short circuits, unstable data transmission, or even device damage when liquid enters. By automatically detecting liquid in the USB interface and cutting off the power in time, short circuits are avoided, thereby improving the safety of the USB interface and the stability of the device.

[0005] To address the aforementioned issues, this application provides a USB protection circuit against liquid short circuits, comprising: a current detection module connected to the USB data channel line of the Type-C connector, used to detect the current of the USB data channel line; a comparator module connected to the current detection module, used to generate an INT signal based on the USB data channel line current returned by the current detection module; a feedback prompt module connected to the USB data channel line of the Type-C connector; a logic control module, the input terminal of which is connected to the comparator module, used to receive the INT signal output by the comparator module and output an EN signal when the INT signal is low; a first output terminal of which is connected to the feedback prompt module, used to output the INT signal to the feedback prompt module when the INT signal is low; and a power management module connected to the second output terminal of the logic control module, used to receive and stop power supply to the Type-C connector based on the EN signal.

[0006] Preferably, the current detection module includes a first resistor and a second resistor, the first resistor being connected to the positive data line of the USB data channel line, and the second resistor being connected to the negative data line of the USB data channel line.

[0007] Preferably, the comparator module includes a first ADC current detection comparator and a second ADC current detection comparator, the first resistor is connected to the first ADC current detection comparator, and the second resistor is connected to the second ADC current detection comparator.

[0008] Preferably, the logic control module includes an OR gate switch, the first ADC current detection comparator is connected to the first input terminal of the OR gate switch, and the second ADC current detection comparator is connected to the second input terminal of the OR gate switch.

[0009] Preferably, the power management module includes a load switch, the output of which is connected to the EN pin of the load switch, and the load switch is used to control the power supply to the Type-C connector.

[0010] Preferably, the load switch supplies 5V to the Type-C connector.

[0011] Preferably, the feedback module is connected to a remote system and is used to indicate an interface abnormality of the Type-C connector through the remote system.

[0012] This application also provides a USB protection device against liquid short circuits, including a USB connector and a USB protection circuit. The USB protection circuit includes: a current detection module connected to the USB data channel line of the Type-C connector for detecting the current of the USB data channel line; a comparator module connected to the current detection module for generating an INT signal based on the USB data channel line current returned by the current detection module; a feedback prompt module connected to the USB data channel line of the Type-C connector; a logic control module whose input terminal is connected to the comparator module for receiving the INT signal output by the comparator module and outputting an EN signal when the INT signal is low; a first output terminal of the logic control module connected to the feedback prompt module for outputting the INT signal to the feedback prompt module when the INT signal is low; and a power management module connected to the second output terminal of the logic control module for receiving and stopping power supply to the Type-C connector based on the EN signal.

[0013] The above-described one or more technical solutions in this application have at least one or more of the following technical effects:

[0014] This application provides a USB protection circuit against liquid short circuits, comprising: a current detection module connected to the USB data channel line of a Type-C connector, used to detect the current of the USB data channel line; a comparator module connected to the current detection module, used to generate an INT signal based on the USB data channel line current returned by the current detection module; a feedback prompt module connected to the USB data channel line of the Type-C connector; a logic control module, the input terminal of which is connected to the comparator module, used to receive the INT signal output by the comparator module and output an EN signal when the INT signal is a low-level signal; a first output terminal of which is connected to the feedback prompt module, used to output the INT signal to the feedback prompt module when the INT signal is a low-level signal; and a power management module connected to the second output terminal of the logic control module, used to receive and stop power supply to the Type-C connector based on the EN signal. This invention solves the technical problem in existing technologies where USB interfaces are prone to short circuits, unstable data transmission, and even device damage when liquid enters the interface. By automatically detecting liquid in the USB interface and cutting off the power in time, it avoids short circuits and improves the safety of the USB interface and the stability of the device. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a USB protection circuit for preventing liquid short circuits provided in an embodiment of this application.

[0017] Reference numerals: 1. Feedback prompt module; 2. Type-C connector; 3. First ADC current detection comparator; 4. Second ADC current detection comparator; 5. Load switch; 6. OR gate switch. Detailed Implementation

[0018] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0019] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0020] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in the description of embodiments in this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0021] In Example 1, this application provides a USB protection circuit to prevent liquid short circuits, which solves the technical problem in the prior art that USB interfaces are prone to short circuits, unstable data transmission, or even device damage when liquid enters.

[0022] The overall structure of the technical solution in this application is as follows: a current detection module connected to the USB data channel line of the Type-C connector, used to detect the current of the USB data channel line; a comparator module connected to the current detection module, used to generate an INT signal based on the USB data channel line current returned by the current detection module; a feedback prompt module connected to the USB data channel line of the Type-C connector; a logic control module, the input terminal of which is connected to the comparator module, used to receive the INT signal output by the comparator module, and output an EN signal when the INT signal is a low-level signal; a first output terminal of the logic control module connected to the feedback prompt module, used to output the INT signal to the feedback prompt module when the INT signal is a low-level signal; and a power management module connected to the second output terminal of the logic control module, used to receive and stop power supply to the Type-C connector based on the EN signal.

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] like Figure 1 As shown, this application provides a USB protection circuit against liquid short circuits, comprising: a current detection module connected to the USB data channel line of the Type-C connector 2, used to detect the current of the USB data channel line; a comparator module connected to the current detection module, used to generate an INT signal based on the USB data channel line current returned by the current detection module; a feedback prompt module 1 connected to the USB data channel line of the Type-C connector 2; a logic control module, the input terminal of which is connected to the comparator module, used to receive the INT signal output by the comparator module, and output an EN signal when the INT signal is a low-level signal; a first output terminal of which is connected to the feedback prompt module 1, used to output the INT signal to the feedback prompt module 1 when the INT signal is a low-level signal; and a power management module connected to the second output terminal of the logic control module, used to receive and stop power supply to the Type-C connector 2 according to the EN signal.

[0025] Specifically, such as Figure 1As shown, the current sensing module is first connected to the USB data channel lines of Type-C connector 2, including the positive data line (DP) and the negative data line (DN). This module detects current changes on the data channel lines through first and second resistors. Under normal circumstances, the current in the data channel lines will not exceed a preset threshold, and the system maintains normal operation. Next, the current sensing module transmits the acquired current signal to the comparator module. The comparator module compares the current information returned by the current sensing module and generates an INT signal. When the current value is within the normal range, the INT signal is high; once the current value exceeds the threshold (usually due to a short circuit caused by liquid), the INT signal goes low.

[0026] Subsequently, the INT signal is output to the logic control module, which then judges the signal. When the INT signal is low (indicating liquid intrusion into the USB interface), the logic control module outputs an EN signal to control subsequent steps. This EN signal acts as a control signal, determining whether to stop power supply to the Type-C interface. Upon receiving a low-level INT signal, the logic control module also triggers feedback module 1. Feedback module 1 is connected to the USB data channel line of Type-C connector 2 and to the remote system. At this time, feedback module 1 sends a notification via the remote system regarding the detected abnormality (such as liquid intrusion), reminding the user to remove the liquid to restore the normal function of the USB interface. Feedback module 1, acting as the CPU main controller, undertakes the overall management and monitoring functions of the USB device and is the source end of the USB device. Specifically, feedback module 1, in cooperation with the power management module, logic control module, and other modules, monitors and controls the working status of these modules in real time to ensure timely and effective protection of the USB interface in abnormal situations, such as liquid intrusion. Furthermore, after the abnormality is resolved, feedback module 1 reconfigures the system to restore the normal operation of the USB device.

[0027] When the INT signal is low, the EN signal from the logic control module is transmitted to the power management module. Upon receiving this signal, the load switch 5 in the power management module will stop supplying power to the Type-C connector 2. By turning off the power, further damage to the USB interface or connected devices caused by liquid-induced short circuits is prevented.

[0028] Through this series of steps, short circuits caused by liquid intrusion are effectively detected, and corresponding protective measures are taken to prevent damage to the USB interface.

[0029] Preferably, the current detection module includes a first resistor and a second resistor, the first resistor being connected to the positive data line of the USB data channel line, and the second resistor being connected to the negative data line of the USB data channel line.

[0030] Specifically, such as Figure 1 As shown, the current sensing module includes a first resistor R1 and a second resistor R2. The first resistor is connected to the positive data line of the USB data channel line, and the second resistor is connected to the negative data line of the USB data channel line. Specifically, the first resistor in the current sensing module is connected to the positive data line of the USB data channel line. The positive data line is a critical signal transmission line in the USB interface, responsible for sending data. By connecting the first resistor in series on this line, the current change in the positive data line is measured. Normally, this current value should be kept within a safe range. The second resistor is connected to the negative data line (DN) of the USB data channel line. The negative data line is another signal line used to pair with the positive data line to transmit differential signals. The current in the negative data line is also measured through the second resistor, providing a complete detection of the overall current state of the USB data channel line.

[0031] The core function of the current detection module is to detect the current on the positive and negative data lines using these two resistors. When the USB interface is working normally, the current on the positive and negative data lines should be within the preset normal range. The first and second resistors then transmit the corresponding data to the subsequent comparator module for analysis.

[0032] If liquid enters the positive or negative data lines of the USB interface, it can cause short circuits between the data lines or between a data line and the ground terminal, leading to an abnormal increase in current. In this case, the data current detected by the first and second resistors will significantly exceed a preset threshold, and the current detection module will then send an abnormal current signal back to the comparator module for further processing.

[0033] This current detection module accurately monitors the current changes of the positive and negative data lines on the USB data channel line. Especially when liquid enters, it can promptly detect abnormal current and activate the protection mechanism, thereby preventing the USB interface from being damaged due to short circuit.

[0034] Preferably, the comparator module includes a first ADC current detection comparator 3 and a second ADC current detection comparator 4, the first resistor is connected to the first ADC current detection comparator 3, and the second resistor is connected to the second ADC current detection comparator 4.

[0035] Specifically, such as Figure 1As shown, the comparator module includes a first ADC current detection comparator 3 and a second ADC current detection comparator 4. In the circuit, a first resistor is connected to the positive data line (DP) of the USB data channel, transmitting the current signal from the positive data line to the first ADC current detection comparator 3. The ADC converts the current signal into a digital signal, enabling more accurate current detection and analysis. The first ADC comparator determines whether there is an abnormal current by monitoring the current changes on the positive data line in real time. Similarly, a second resistor is connected to the negative data line (DN) of the USB data channel, used to monitor the current on the negative data line. The second resistor transmits the current signal from the negative data line to the second ADC current detection comparator 4, which converts these current signals into digital signals for precise comparison and analysis.

[0036] When the first ADC current detection comparator 3 and the second ADC current detection comparator 4 receive current signals from the positive and negative data lines, respectively, they compare these signals with preset current thresholds. If the detected current exceeds the safe range, the comparator module will output an abnormal signal (INT signal). This abnormality is usually caused by liquid entering the USB interface, causing a short circuit in the positive or negative data line, thus triggering an abnormal increase in current.

[0037] By using two ADC current sensing comparators to simultaneously monitor current changes on both the positive and negative data lines, a more comprehensive understanding of the USB interface's operating status is achieved. This dual-channel detection design improves the system's response speed and detection accuracy, enabling it to more quickly identify short circuits caused by liquid intrusion and promptly trigger subsequent protection mechanisms. When either ADC current sensing comparator detects an abnormal current, the comparator module outputs a low-level INT signal to the logic control module, initiating subsequent protection actions. This signal not only triggers a feedback alert but also controls the power management module to stop supplying power to the USB interface, ensuring the safety of the entire system.

[0038] Preferably, the logic control module includes an OR gate switch 6, the first ADC current detection comparator 3 is connected to the first input terminal of the OR gate switch 6, and the second ADC current detection comparator 4 is connected to the second input terminal of the OR gate switch 6.

[0039] Specifically, such as Figure 1As shown, the logic control module includes an OR gate switch 6, which integrates signals from two ADC current detection comparators to achieve intelligent control. During circuit operation, the first ADC current detection comparator 3 monitors the current state of the USB data channel's positive data line (DP) and transmits the signal to the first input of the OR gate switch 6 in the logic control module. This comparator detects whether the current on the positive data line exceeds a preset threshold. If it does, it outputs a low-level signal as an anomaly indication, reflecting potential liquid intrusion into the USB interface. Simultaneously, the second ADC current detection comparator 4 monitors the current state of the USB data channel's negative data line (DN) and transmits the detection signal to the second input of the OR gate switch 6. Similarly, when an anomaly occurs on the negative data line, such as a short circuit caused by liquid, the second ADC current detection comparator 4 also outputs a low-level signal.

[0040] The operating logic of OR gate switch 6 is that if either of its two input terminals receives a low-level signal, the output terminal of OR gate switch 6 will output a low-level signal. Therefore, OR gate switch 6 can synthesize current abnormal signals from both the positive and negative data lines. That is, regardless of whether a problem occurs on the positive data line (DP) or the negative data line (DN), OR gate switch 6 will respond immediately and feed back the abnormal situation to the subsequent control flow.

[0041] Preferably, the power management module includes a load switch 5, and the output terminal of the OR gate switch 6 is connected to the EN pin of the load switch 5. The load switch 5 is used to control the power supply to the Type-C connector 2.

[0042] Specifically, such as Figure 1 As shown, the power management module controls the power supply to the Type-C connector 2 through the Load Switch 5. Combined with the signal output of the OR gate switch 6, it ensures rapid power cut-off in the event of liquid intrusion into the USB interface, protecting the device. Specifically, when an abnormal current occurs on the positive data line (DP) or negative data line (DN) of the USB data channel, the first or second ADC current detection comparator 4 outputs a low-level signal. The OR gate switch 6, based on its logic, will output a low-level signal if any input is low, indicating an abnormal current. This low-level signal is transmitted from the output of the OR gate switch 6 to the EN pin (enable pin) of the Load Switch 5. The EN pin is the control port of the load switch, used to determine whether to supply power to the Type-C connector 2. When the EN pin receives a low-level signal, the Load Switch 5 automatically turns off, thus cutting off the power supply.

[0043] Load Switch 5 is an electronic switch responsible for controlling the flow of current. Under normal circumstances, the EN pin remains high, and the load switch remains closed, providing a stable 5V power supply to the Type-C connector 2. However, when the EN pin receives a low-level signal from OR gate switch 6, the load switch quickly actuates, disconnecting the power supply to ensure that the USB interface does not continue to supply power in the event of liquid intrusion or a short circuit, thus preventing further damage.

[0044] Preferably, the load switch 5 supplies 5V to the Type-C connector 2.

[0045] Specifically, such as Figure 1 As shown, Load Switch 5 controls the power supply to Type-C connector 2 and ensures a stable 5V supply voltage, which is the standard power supply voltage for USB interfaces. By outputting 5V to Type-C connector 2, a stable power supply is provided to USB devices, ensuring their normal operation.

[0046] Preferably, the feedback module 1 is connected to a remote system and is used to indicate an interface abnormality of the Type-C connector 2 through the remote system.

[0047] Specifically, such as Figure 1 As shown, the feedback module 1, through its connection with the remote system, provides real-time alerts for any abnormalities in the Type-C connector 2 interface, ensuring users can address potential problems promptly. Specifically, when the USB interface's current detection module detects abnormalities such as liquid intrusion or a short circuit, the current signal is processed by the comparator module. If the comparator outputs a low-level INT signal, it indicates an abnormal current in the USB interface, and this signal is then transmitted to the logic control module. Upon receiving the abnormal signal, the logic control module transmits this low-level signal to the feedback module 1. The feedback module 1 is responsible for relaying this abnormality to the remote system to alert the user.

[0048] Feedback module 1 maintains a connection with the remote system. When an interface anomaly is detected, feedback module 1 issues a warning or notification through the remote system. This notification may take various forms, such as a pop-up warning on the device's display screen, or alerting the user via sound, vibration, or other means that the USB interface is at risk of liquid intrusion or short circuit. After receiving the feedback notification through the remote system, the user can take appropriate measures based on the prompt. For example, when the system indicates that the USB interface has been infiltrated by liquid, the user can immediately disconnect the connection and remove the liquid to prevent further damage.

[0049] The technical method provided in this application has at least the following technical effects or advantages:

[0050] This application provides a USB protection circuit against liquid short circuits, comprising: a current detection module connected to the USB data channel line of a Type-C connector, used to detect the current of the USB data channel line; a comparator module connected to the current detection module, used to generate an INT signal based on the USB data channel line current returned by the current detection module; a feedback prompt module connected to the USB data channel line of the Type-C connector; a logic control module, the input terminal of which is connected to the comparator module, used to receive the INT signal output by the comparator module and output an EN signal when the INT signal is a low-level signal; a first output terminal of which is connected to the feedback prompt module, used to output the INT signal to the feedback prompt module when the INT signal is a low-level signal; and a power management module connected to the second output terminal of the logic control module, used to receive and stop power supply to the Type-C connector based on the EN signal. This invention solves the technical problem in existing technologies where USB interfaces are prone to short circuits, unstable data transmission, and even device damage when liquid enters the interface. By automatically detecting liquid in the USB interface and cutting off the power in time, it avoids short circuits and improves the safety of the USB interface and the stability of the device.

[0051] Example 2: This application also provides a USB protection device to prevent liquid short circuits, which includes a USB connector and the USB protection circuit described above.

[0052] Exemplary examples show that the protective device may also include other components, which are not limited in this application embodiment. The protective device may be a mobile phone, tablet computer, Bluetooth headset, game console, data cable, charger, or power bank, etc.

[0053] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0054] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of the embodiments of this application. Therefore, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application also intends to include these modifications and variations.

Claims

1. A USB protection circuit to prevent liquid short circuits, characterized in that, The circuit includes: A current detection module is connected to the USB data channel line of the Type-C connector and is used to detect the current of the USB data channel line. A comparator module, which is connected to a current detection module, is used to generate an INT signal based on the USB data channel line current returned by the current detection module. A feedback prompt module is connected to the USB data channel cable of the Type-C connector; A logic control module, the input of which is connected to the comparator module, is used to receive the INT signal output by the comparator module and output the EN signal when the INT signal is a low level signal; The first output terminal of the logic control module is connected to the feedback prompt module, and is used to output the INT signal to the feedback prompt module when the INT signal is a low level signal; A power management module, which is connected to the second output terminal of the logic control module, is used to receive and stop supplying power to the Type-C connector according to the EN signal.

2. The USB protection circuit against liquid short circuits as described in claim 1, characterized in that, Also includes: The current detection module includes a first resistor and a second resistor. The first resistor is connected to the positive data line of the USB data channel line, and the second resistor is connected to the negative data line of the USB data channel line.

3. The USB protection circuit against liquid short circuits as described in claim 2, characterized in that, Also includes: The comparator module includes a first ADC current detection comparator and a second ADC current detection comparator. The first resistor is connected to the first ADC current detection comparator, and the second resistor is connected to the second ADC current detection comparator.

4. The USB protection circuit against liquid short circuits as described in claim 3, characterized in that, Also includes: The logic control module includes an OR gate switch, the first ADC current detection comparator is connected to the first input terminal of the OR gate switch, and the second ADC current detection comparator is connected to the second input terminal of the OR gate switch.

5. A USB protection circuit for preventing liquid short circuits as described in claim 4, characterized in that, Also includes: The power management module includes a load switch, the output of which is connected to the EN pin of the load switch. The load switch is used to control the power supply to the Type-C connector.

6. The USB protection circuit against liquid short circuits as described in claim 5, characterized in that, The load switch supplies 5V to the Type-C connector.

7. A USB protection circuit for preventing liquid short circuits as described in claim 1, characterized in that, The feedback module is connected to a remote system and is used to indicate an interface abnormality of the Type-C connector through the remote system.

8. A USB protection device for preventing liquid short circuits, characterized in that, Includes a USB connector and a USB protection circuit as described in any one of claims 1-7.

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