Load end Type-C interface water vapor detection circuit and detection method

Abstract

The invention discloses a load-end Type-C interface water vapor detection circuit and detection method. The circuit comprises the steps that a pull-up module drives a detection module to sample a configuration channel of an interface; a pull-up resistor in the pull-up module is connected with the configuration channel through a switch S1, and a pull-down resistor is connected with the configuration channel through a switch S2; the detection module compares the upper threshold voltage Vth with the input voltage Vin and compares the lower threshold voltage Vtl with the input voltage Vin, the delayer Y1 compares the change condition of the input voltage Vin, and the counter outputs the counting result of the number of clocks. Therefore, only one pull-up voltage is introduced, other circuit designs are integrated in the power management chip, the Type-C interface does not need to be subjected to design change, water vapor intrusion can be quantitatively detected by analyzing detection modes such as rise time, a rise and fall curve and partial voltage value change of the input voltage, the upgrading and refitting cost is low, the use of the existing interface is not influenced, and the application range is wide. The application scene is wide.

Description

Technical Field

[0001] This invention relates to the field of circuit design technology, and in particular to a moisture detection circuit and detection method for a Type-C interface on the load side. Background Technology

[0002] Currently, the Type-C interface is widely used in various types of devices for power supply and data transmission. The increasing number of application scenarios has also made the usage environment of the Type-C interface more and more complex. It may be splashed with water in environments such as kitchens and bathrooms, or it may get contaminated with sweat or raindrops when used by hand. Such moisture intrusion may cause problems such as short circuits, contact corrosion, and signal interference. Therefore, moisture detection for the Type-C interface is a necessary requirement for all types of devices.

[0003] To address this, existing solutions involve adding probes to the Type-C interface to measure changes in voltage and current characteristics under dry and humid conditions, thereby determining whether moisture intrusion has occurred. However, the power consumption of this method exceeds the power consumption generated by moisture intrusion, and high-precision sampling places high demands on the power management chip. Furthermore, it requires additional data storage capacity, resulting in additional hardware costs.

[0004] In addition, there is a solution that embeds a metal plate inside the plastic-encapsulated tongue of the Type-C interface female connector, thereby forming a capacitor with the ground wire. When moisture intrusion causes changes in the medium, the capacitance value can be measured by an integrator to detect moisture intrusion. However, this solution requires redesigning and manufacturing the Type-C interface, which means that the massive number of devices produced in the past cannot adopt this solution. Even newly manufactured Type-C interfaces will increase additional hardware costs, and the additional capacitor setting will also interfere with high-speed signals, thus limiting the application scenarios. Summary of the Invention

[0005] Embodiment 1 of the present invention discloses a water vapor detection circuit for a Type-C interface on the load side, specifically including:

[0006] A pull-up module and a detection module are connected to the Type-C interface. The pull-up module is used to drive the detection module to sample and detect the configuration channel of the Type-C interface. The pull-up module includes a pull-up resistor R1 connected to the pull-up voltage Vp and a pull-down resistor Rd grounded; The pull-up resistor R1 is connected to the configuration channel via switch S1, and the pull-down resistor Rd is connected to the configuration channel via switch S2; The detection module includes a comparator T1 that compares the upper threshold voltage Vth with the input voltage Vin, a comparator T2 that compares the lower threshold voltage Vtl with the input voltage Vin, and a comparator T3 that uses a delay unit Y1 to compare the changes in the input voltage Vin. The outputs of the comparators T1 and T2 are connected to a counter J1 via an AND gate and a selector X1. The output of the comparator T3 is connected to the counter J1 via the selector X1. The counter J1 outputs the count result of the number of clock cycles.

[0007] As an optional implementation, closing the switches S1 and S2 sets the selector X1 to position 0; The counter J1 acquires the AND gate signal and records the first clock cycle number of times the input voltage Vin rises from the lower threshold voltage Vtl to the upper threshold voltage Vth. Based on the first clock count, analyze whether the Type-C interface has an equivalent capacitance Cpar.

[0008] As an optional implementation, moisture intrusion at the Type-C interface induces the equivalent capacitance Cpar. When the equivalent capacitance Cpar is absent, the pull-up voltage Vp is divided by the pull-up resistor R1 and the pull-down resistor Rd, at which point the limiting voltage is... ; in, This is the power supply voltage.

[0009] As an optional implementation, when the equivalent capacitance Cpar is present, the equivalent capacitance Cpar divides the pull-up voltage Vp, and the time it takes for the input voltage Vin to rise to the limit voltage Vrd is greater than the time it takes for the input voltage Vin to rise to the limit voltage Vrd when the equivalent capacitance Cpar is not present. The lower threshold voltage Vtl and the upper threshold voltage Vth are set between 0 and the limit voltage Vrd to measure the number of clock cycles required for the input voltage Vin to rise from the lower threshold voltage Vtl to the upper threshold voltage Vth.

[0010] As an optional implementation, the input voltage Vin rises to the limit voltage. Then, disconnect the switch S1; The counter J1 records the input voltage Vin rising from 0 to the limit voltage. The number of rising clock cycles, and the recording of the input voltage Vin from the limit voltage. The number of down-clock cycles that drop to 0; If the number of rising clocks is equal to the number of falling clocks, then the equivalent capacitance Cpar is considered to exist.

[0011] As an optional implementation, the switch S1 is closed and the switch S2 is opened, and the selector X1 is set to position 1; The delay unit Y1 records the initial value of the input voltage Vin and inputs it into the comparator T3, thereby reducing the resistance value of the pull-up resistor R1 and inputting the adjustment value of the input voltage Vin into the comparator T3. The comparator T3 compares the initial value and the adjusted value of the input voltage Vin to analyze whether the Type-C interface has an equivalent micro short-circuit resistance Rshort.

[0012] As an optional implementation, moisture intrusion at the Type-C interface induces the equivalent micro short-circuit resistance Rshort. When the equivalent micro short-circuit resistor Rshort is not present, one end of the pull-up resistor R1 is connected to the pull-up voltage Vp, and the other end is floating. The initial value and the adjustment value of the input voltage Vin are always equal to the pull-up voltage Vp. When the equivalent micro short-circuit resistance Rshort is present, the initial value of the input voltage Vin is not equal to the adjusted value.

[0013] As an optional implementation, the switch S1 is closed first, and then the switches S1 and S2 are opened to set the selector X1 to position 0. When the equivalent capacitance Cpar and the equivalent micro short-circuit resistance Rshort are present simultaneously, the counter J1 measures the second number of clock cycles in which the input voltage Vin drops from the upper threshold voltage Vth to the lower threshold voltage Vtl. When the equivalent capacitance Cpar or the equivalent micro short-circuit resistance Rshort is absent, the input voltage Vin is a floating voltage, and the counter J1 does not generate a signal output.

[0014] Embodiment 2 of the present invention discloses a method for detecting water vapor at a Type-C interface on a load side, characterized in that it includes: The configuration channel of the Type-C interface is controlled by the pull-up voltage Vp and pull-up resistor R1 controlled by the access switch S1, and the pull-down resistor Rd controlled by the access switch S2. Close the switches S1 and S2, record the number of clock cycles for the input voltage Vin to rise from the lower threshold voltage Vtl to the upper threshold voltage Vth, and analyze whether the Type-C interface has an equivalent capacitance Cpar. Close the switch S1, open the switch S2, and reduce the resistance value of the pull-up resistor R1. Record the change in the input voltage Vin and analyze whether there is an equivalent micro short-circuit resistance Rshort in the Type-C interface. First, close the switch S1, then open the switch S1 and the switch S2, record the number of clock cycles that the input voltage Vin drops from the upper threshold voltage Vth to the lower threshold voltage Vtl, and analyze whether the Type-C interface simultaneously has the equivalent capacitance Cpar and the equivalent micro short-circuit resistance Rshort.

[0015] As an optional implementation, moisture intrusion at the Type-C interface can induce the equivalent capacitance Cpar or the equivalent micro short-circuit resistance Rshort. The higher the electrolyte concentration in the droplets formed by water vapor intrusion, the larger the equivalent capacitance Cpar, and the lower the rate of rise of the input voltage Vin. The greater the number of liquid droplets formed by water vapor intrusion, the smaller the equivalent micro short-circuit resistance Rshort.

[0016] Compared with the prior art, this embodiment has the following beneficial effects: In this embodiment, only one pull-up voltage is introduced, and the rest of the circuit design is integrated into the power management chip. No design changes to the Type-C interface are required, and quantitative detection of moisture intrusion can be achieved through the following multiple schemes: 1. The equivalent capacitance Cpar induced by moisture intrusion will slow down the rise rate of the input voltage Vin. By measuring the rise time of the input voltage Vin in the threshold range, it can be determined whether moisture intrusion exists.

[0017] 2. The equivalent capacitance Cpar reduces the rate of increase of the input voltage Vin on the one hand, and also reduces the rate of decrease of the input voltage Vin after the switch is opened on the other hand. Measure the curve of the input voltage Vin before and after the switch is opened. If the two are symmetrical, it is determined that the equivalent capacitance Cpar exists.

[0018] 3. Moisture intrusion may also generate an equivalent micro short-circuit resistance Rshort, which will divide the input voltage Vin. By significantly adjusting the pull-up resistor, it is possible to measure whether the input voltage Vin changes and determine whether moisture intrusion exists.

[0019] Based on the above solutions, upgrades and modifications can be made without affecting the use of existing Type-C interfaces. This approach is cost-effective and has a wide range of applications. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this embodiment, the accompanying drawings used in the embodiment will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the circuit principle of a load-side Type-C interface water vapor detection circuit disclosed in this embodiment; Figure 2 This is a schematic diagram of the current parameters when measuring the equivalent capacitance Cpar using a water vapor detection circuit at the load-side Type-C interface disclosed in this embodiment. Figure 3 This is a schematic diagram of the current parameters when measuring the equivalent micro short-circuit resistance Rshort using a water vapor detection circuit at the load-side Type-C interface disclosed in this embodiment. Figure 4 This is a schematic diagram of the current parameters of a load-side Type-C interface water vapor detection circuit disclosed in this embodiment when simultaneously measuring the equivalent capacitance Cpar and the equivalent micro short-circuit resistance Rshort. Figure 5 This is a schematic diagram of the workflow of a load-side Type-C interface detection method disclosed in this embodiment. Detailed Implementation

[0022] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Example 1 Please see Figures 1-4 This embodiment discloses a water vapor detection circuit for a load-side Type-C interface, comprising: The pull-up module and the detection module are connected to the Type-C interface. The pull-up module is used to drive the detection module to sample and detect the configuration channel of the Type-C interface. The pull-up module includes a pull-up resistor R1 connected to the pull-up voltage Vp and a pull-down resistor Rd grounded; Pull-up resistor R1 is connected to the configuration channel via switch S1, and pull-down resistor Rd is connected to the configuration channel via switch S2; The detection module includes a comparator T1 that compares the upper threshold voltage Vth with the input voltage Vin, a comparator T2 that compares the lower threshold voltage Vtl with the input voltage Vin, and a comparator T3 that uses a delay unit Y1 to compare the changes in the input voltage Vin. The outputs of comparators T1 and T2 are connected to a counter J1 via an AND gate and a selector X1. The output of comparator T3 is connected to the counter J1 via a selector X1. The counter J1 outputs the count result of the number of clock cycles.

[0024] In this embodiment, only one pull-up voltage Vp needs to be introduced. The circuit design of the other pull-up modules and detection modules is integrated into the power management chip, and no design changes are required for the Type-C interface.

[0025] By controlling the on / off states and timing of switches S1 and S2, multiple detection modes can be switched to quantitatively detect water vapor intrusion.

[0026] Its upgrade and modification costs are low. It can be upgraded on the Type-C interface of old equipment, or the driver can be upgraded based on the old circuit design. At the same time, it does not affect the use of the existing Type-C interface, and its application scenarios are wide.

[0027] In this embodiment, closing switches S1 and S2 sets selector X1 to position 0. Counter J1 acquires the AND gate signal and records the number of clock cycles in which the input voltage Vin rises from the lower threshold voltage Vtl to the upper threshold voltage Vth. Based on the first clock cycle count, analyze whether the Type-C interface has an equivalent capacitance Cpar.

[0028] As an optional implementation, moisture intrusion at the Type-C interface generates an equivalent capacitance Cpar; When there is no equivalent capacitance Cpar, the pull-up voltage Vp is divided by the pull-up resistor R1 and the pull-down resistor Rd. At this point, the limiting voltage... ; in, This is the power supply voltage.

[0029] As an optional implementation, when the equivalent capacitance Cpar exists, the equivalent capacitance Cpar divides the pull-up voltage Vp, and the time it takes for the input voltage Vin to rise to the limit voltage Vrd is greater than the time it takes for the input voltage Vin to rise to the limit voltage Vrd when the equivalent capacitance Cpar does not exist. Set a lower threshold voltage Vtl and an upper threshold voltage Vth between 0 and the limit voltage Vrd to measure the number of clock cycles required for the input voltage Vin to rise from the lower threshold voltage Vtl to the upper threshold voltage Vth.

[0030] Specifically, the equivalent capacitance Cpar induced by water vapor intrusion will slow down the rise rate of the input voltage Vin, making the rise time of the input voltage Vin between the lower threshold voltage Vtl and the upper threshold voltage Vth longer. As a result, the counter J1 records more clock cycles, which can be used to determine whether the equivalent capacitance Cpar exists.

[0031] As another alternative implementation, the input voltage Vin rises to a limit voltage. Then, disconnect switch S1; Counter J1 records the input voltage Vin rising from 0 to the limit voltage. The number of rising clock cycles, and the recording of the input voltage Vin from the limit voltage. The number of down-clock cycles that drop to 0; If the number of rising clock cycles equals the number of falling clock cycles, then an equivalent capacitance Cpar is considered to exist.

[0032] It should be understood that the higher the electrolyte concentration in the droplets produced by water vapor intrusion, the stronger its corrosiveness to the interface, and the larger the capacitance value of the equivalent capacitance Cpar. The capacitance value of the equivalent capacitance Cpar can be expressed as the rise time of the input voltage Vin.

[0033] Therefore, in addition to determining whether moisture intrusion exists based on the rise time of the equivalent capacitance Cpar, the capacitance value of the equivalent capacitance Cpar can also be quantitatively calculated based on the specific value of the rise time and the system circuit parameters, thereby quantifying the degree of moisture intrusion.

[0034] Here, in addition to measuring the rise time of the equivalent capacitance Cpar, the rise time and fall time of the input voltage Vin can also be compared. If the rise time is equal to the fall time and the two curves are symmetrical, then the existence of the equivalent capacitance Cpar can be determined.

[0035] In this embodiment, closing switch S1 and opening switch S2 sets selector X1 to position 1. The delay unit Y1 records the initial value of the input voltage Vin and inputs it into the comparator T3, which then lowers the value of the pull-up resistor R1. The adjusted value of the input voltage Vin is then input into the comparator T3. Comparator T3 compares the initial value and the adjusted value of the input voltage Vin to analyze whether the Type-C interface has an equivalent micro short-circuit resistance Rshort.

[0036] As an optional implementation, moisture intrusion at the Type-C interface induces the equivalent micro short-circuit resistance Rshort. When there is no equivalent micro short-circuit resistor Rshort, one end of the pull-up resistor R1 is connected to the pull-up voltage Vp, and the other end is floating. The initial value and the adjustment value of the input voltage Vin are always equal to the pull-up voltage Vp. When an equivalent micro short-circuit resistance Rshort exists, the initial value of the input voltage Vin is not equal to the adjusted value.

[0037] Specifically, when switch S1 is closed and switch S2 is open, selector X1 is set to position 1, and pull-up resistor R1 is adjusted to a smaller value, such as reducing it to one percent of the initial resistance.

[0038] If there is no moisture intrusion or other abnormality, one end of the pull-up resistor R1 should be connected to the pull-up voltage Vp, and the other end should be floating. Then, no matter how the value of the pull-up resistor R1 is changed, the input voltage Vin will always be equal to the pull-up voltage Vp.

[0039] Conversely, if moisture intrusion occurs, the input voltage Vin will increase due to the voltage division of the equivalent micro short-circuit resistance Rshort. At this time, the initial value of the input voltage Vin is recorded by the delay unit Y1, and the comparator T3 compares the initial value with the adjusted value. If there is a difference between the two values, it indicates that there is an equivalent micro short-circuit resistance Rshort.

[0040] As another alternative implementation, the input voltage Vin can be reduced by increasing the value of the pull-up resistor R1, such as increasing it to one hundred times the initial value. Based on this, it can be determined whether the increase and decrease of the input voltage Vin are symmetrical, and thus determine whether there is an equivalent micro short-circuit resistor Rshort.

[0041] In this embodiment, switch S1 is closed first, and then switches S1 and S2 are opened to set selector X1 to position 0. When both the equivalent capacitance Cpar and the equivalent micro short-circuit resistance Rshort exist simultaneously, the counter J1 measures the second number of clock cycles in which the input voltage Vin drops from the upper threshold voltage Vth to the lower threshold voltage Vtl. When there is no equivalent capacitance Cpar or equivalent micro short-circuit resistance Rshort, the input voltage Vin is a floating voltage, and the counter J1 does not generate a signal output.

[0042] Specifically, if there is water vapor intrusion and both the equivalent capacitance Cpar and the equivalent micro short-circuit resistance Rshort exist, the input voltage Vin should be gradually reduced to 0 by the voltage divider of the equivalent micro short-circuit resistance Rshort. That is, the input voltage Vin will stay between Vth and Vtl for a period of time, thereby realizing the simultaneous determination of the equivalent capacitance Cpar and the equivalent micro short-circuit resistance Rshort.

[0043] It is understandable that the more severe the moisture intrusion, the easier it is for micro-short circuits to occur, and the smaller the resulting equivalent micro-short resistance Rshort will be. Specifically, this is reflected in the change in the input voltage Vin as the pull-down resistor Rp decreases. By combining the system circuit parameters, the resistance value of the equivalent micro-short resistance Rshort can be quantitatively calculated, thereby quantifying the degree of moisture intrusion.

[0044] Furthermore, by adjusting the resistance values ​​of the pull-up resistor R1 and the pull-down resistor Rd, the detection sensitivity of the equivalent capacitance Cpar and the equivalent micro short-circuit resistance Rshort can be adjusted.

[0045] It is understandable that all situations caused by water vapor intrusion can be categorized and converted into detection of the equivalent capacitance Cpar or the equivalent micro short-circuit resistance Rshort. Therefore, the relevant detection modules for the equivalent capacitance Cpar or the equivalent micro short-circuit resistance Rshort proposed in this embodiment are reusable, which significantly reduces the complexity of circuit development and design.

[0046] Furthermore, in addition to detecting the equivalent capacitance Cpar or the equivalent micro short-circuit resistance Rshort, it can also detect electrical anomalies in the Type-C interface based on the above-mentioned detection modules and detection logic, thereby achieving a wider range of applications and adapting to more application scenarios.

[0047] Compared with the prior art, this embodiment has the following beneficial effects: In this embodiment, only one pull-up voltage is introduced, and the rest of the circuit design is integrated into the power management chip. No design changes are required for the Type-C interface. Quantitative detection of water vapor intrusion can be achieved through multiple detection modes. Its upgrade and modification costs are low, it does not affect the use of the existing Type-C interface, and it has a wide range of applications.

[0048] Example 2 Please see Figure 5 This embodiment discloses a method for detecting moisture at a load-side Type-C interface, including: 01. Configure the Type-C interface with the pull-up voltage Vp and pull-up resistor R1 controlled by the access switch S1, and the pull-down resistor Rd controlled by the access switch S2.

[0049] 02. Close switches S1 and S2, record the number of clock cycles it takes for the input voltage Vin to rise from the lower threshold voltage Vtl to the upper threshold voltage Vth, and analyze whether the Type-C interface has an equivalent capacitance Cpar.

[0050] 03. Close switch S1, open switch S2, and reduce the resistance value of pull-up resistor R1. Record the change in the input voltage Vin and analyze whether there is an equivalent micro short-circuit resistance Rshort in the Type-C interface.

[0051] 04. First close switch S1, then open switch S1 and switch S2. Record the number of clock cycles in which the input voltage Vin drops from the upper threshold voltage Vth to the lower threshold voltage Vtl. Analyze whether the Type-C interface has both the equivalent capacitance Cpar and the equivalent micro short-circuit resistance Rshort.

[0052] In this embodiment, multiple detection modes can be switched by controlling the on / off states and timing of switches S1 and S2, enabling quantitative detection of water vapor intrusion.

[0053] Only one pull-up voltage Vp needs to be introduced; the circuit design of the rest of the pull-up modules and detection modules is integrated into the power management chip, without the need to change the design of the Type-C interface.

[0054] As an optional implementation, the moisture intrusion phenomenon at the Type-C interface generates an equivalent capacitance Cpar or an equivalent micro short-circuit resistance Rshort. The higher the electrolyte concentration in the droplets formed by water vapor intrusion, the larger the equivalent capacitance Cpar, and the lower the rate of rise of the input voltage Vin. The more liquid droplets formed by water vapor intrusion, the smaller the equivalent micro short-circuit resistance Rshort.

[0055] Based on the detection modes mentioned above, there are also various current parameter changes in water vapor intrusion. This allows for accurate detection of different water vapor intrusion scenarios (such as a single liquid droplet short-circuiting adjacent pins, a single liquid droplet short-circuiting multiple pins, and multiple liquid droplets short-circuiting at multiple points), thereby reducing the false alarm rate.

Claims

1. A moisture detection circuit with a Type-C interface at the load end, characterized in that, include: A pull-up module and a detection module are connected to the Type-C interface. The pull-up module is used to drive the detection module to sample and detect the configuration channel of the Type-C interface. The pull-up module includes a pull-up resistor R1 connected to the pull-up voltage Vp and a pull-down resistor Rd grounded; The pull-up resistor R1 is connected to the configuration channel via switch S1, and the pull-down resistor Rd is connected to the configuration channel via switch S2; The detection module includes a comparator T1 that compares the upper threshold voltage Vth with the input voltage Vin, a comparator T2 that compares the lower threshold voltage Vtl with the input voltage Vin, and a comparator T3 that uses a delay unit Y1 to compare the changes in the input voltage Vin. The outputs of the comparators T1 and T2 are connected to a counter J1 via an AND gate and a selector X1. The output of the comparator T3 is connected to the counter J1 via the selector X1. The counter J1 outputs the count result of the number of clock cycles.

2. The water vapor detection circuit for a Type-C interface at the load end according to claim 1, characterized in that, include: Close the switches S1 and S2 to set the selector X1 to position 0. The counter J1 acquires the AND gate signal and records the first clock cycle number of times the input voltage Vin rises from the lower threshold voltage Vtl to the upper threshold voltage Vth. Based on the first clock count, analyze whether the Type-C interface has an equivalent capacitance Cpar.

3. A water vapor detection circuit for a load-side Type-C interface according to claim 2, characterized in that, include: Moisture intrusion at the Type-C interface triggers the generation of the equivalent capacitance Cpar. When the equivalent capacitance Cpar is absent, the pull-up voltage Vp is divided by the pull-up resistor R1 and the pull-down resistor Rd, at which point the limiting voltage is... ; in, This is the power supply voltage.

4. A water vapor detection circuit for a load-side Type-C interface according to claim 3, characterized in that, include: When the equivalent capacitance Cpar exists, the equivalent capacitance Cpar divides the pull-up voltage Vp, and the time it takes for the input voltage Vin to rise to the limit voltage Vrd is greater than the time it takes for the input voltage Vin to rise to the limit voltage Vrd when the equivalent capacitance Cpar does not exist. The lower threshold voltage Vtl and the upper threshold voltage Vth are set between 0 and the limit voltage Vrd to measure the number of clock cycles required for the input voltage Vin to rise from the lower threshold voltage Vtl to the upper threshold voltage Vth.

5. A water vapor detection circuit for a load-side Type-C interface according to claim 4, characterized in that, include: The input voltage Vin rises to the limit voltage. Then, disconnect the switch S1; The counter J1 records the input voltage Vin rising from 0 to the limit voltage. The number of rising clock cycles, and the recording of the input voltage Vin from the limit voltage. The number of down-clock cycles that drop to 0; If the number of rising clocks is equal to the number of falling clocks, then the equivalent capacitance Cpar is considered to exist.

6. A water vapor detection circuit for a load-side Type-C interface according to claim 1, characterized in that, include: Close the switch S1, open the switch S2, and set the selector X1 to position 1; The delay unit Y1 records the initial value of the input voltage Vin and inputs it into the comparator T3, thereby reducing the resistance value of the pull-up resistor R1 and inputting the adjustment value of the input voltage Vin into the comparator T3. The comparator T3 compares the initial value and the adjusted value of the input voltage Vin to analyze whether the Type-C interface has an equivalent micro short-circuit resistance Rshort.

7. A water vapor detection circuit for a load-side Type-C interface according to claim 6, characterized in that, include: Moisture intrusion at the Type-C interface triggers the generation of the equivalent micro short-circuit resistance Rshort. When the equivalent micro short-circuit resistor Rshort is not present, one end of the pull-up resistor R1 is connected to the pull-up voltage Vp, and the other end is floating. The initial value and the adjustment value of the input voltage Vin are always equal to the pull-up voltage Vp. When the equivalent micro short-circuit resistance Rshort is present, the initial value of the input voltage Vin is not equal to the adjusted value.

8. A moisture detection circuit for a Type-C interface at the load end according to any one of claims 2 or 6, characterized in that, include: First close the switch S1, then open the switch S1 and the switch S2, and set the selector X1 to position 0; When the equivalent capacitance Cpar and the equivalent micro short-circuit resistance Rshort are present simultaneously, the counter J1 measures the second number of clock cycles in which the input voltage Vin drops from the upper threshold voltage Vth to the lower threshold voltage Vtl. When the equivalent capacitance Cpar or the equivalent micro short-circuit resistance Rshort is absent, the input voltage Vin is a floating voltage, and the counter J1 does not generate a signal output.

9. A method for detecting a Type-C interface on a load side, characterized in that, include: The configuration channel of the Type-C interface is controlled by the pull-up voltage Vp and pull-up resistor R1 controlled by the access switch S1, and the pull-down resistor Rd controlled by the access switch S2. Close the switches S1 and S2, record the number of clock cycles for the input voltage Vin to rise from the lower threshold voltage Vtl to the upper threshold voltage Vth, and analyze whether the Type-C interface has an equivalent capacitance Cpar. Close the switch S1, open the switch S2, and reduce the resistance value of the pull-up resistor R1. Record the change in the input voltage Vin and analyze whether there is an equivalent micro short-circuit resistance Rshort in the Type-C interface. First, close the switch S1, then open the switch S1 and the switch S2, record the number of clock cycles that the input voltage Vin drops from the upper threshold voltage Vth to the lower threshold voltage Vtl, and analyze whether the Type-C interface simultaneously has the equivalent capacitance Cpar and the equivalent micro short-circuit resistance Rshort.

10. The method for detecting a Type-C interface on a load side according to claim 9, characterized in that, include: Moisture intrusion at the Type-C interface triggers the generation of the equivalent capacitance Cpar or the equivalent micro short-circuit resistance Rshort. The higher the electrolyte concentration in the droplets formed by water vapor intrusion, the larger the equivalent capacitance Cpar, and the lower the rate of rise of the input voltage Vin. The greater the number of liquid droplets formed by water vapor intrusion, the smaller the equivalent micro short-circuit resistance Rshort.

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