Humidity detection protection circuit and charger

Abstract

The utility model discloses a moisture detection protection circuit and a charger. The circuit comprises a detection control circuit and a humidity detection sensor, the detection control circuit is arranged in a charging connector of the charger, and the humidity detection sensor is arranged in a charging interface of an equipment terminal to be charged. The input end of the detection control circuit is connected with the direct-current power output end of the charger through a power line, and after the charging connector of the charger is connected with the charging interface of the equipment terminal, the output end of the detection control circuit is connected with the charging circuit of the equipment terminal through the power line. The control end of the detection control circuit is connected with the humidity detection sensor through the charging connector and the charging interface. The moisture detection sensor can send a moisture detection signal to the detection control circuit after detecting that moisture exists in the charging interface, and the detection control circuit can disconnect the power supply connection between the detection control circuit and the charging circuit after receiving the moisture detection signal. The circuit can prevent the pin of the charging interface from being corroded.

Description

Technical Field

[0001] The present application relates to the field of charging control technology, and in particular to a moisture detection protection circuit and a charger. Background Art

[0002] With the increasing prevalence of electronic devices, particularly mobile devices like smartphones and tablets, charging safety is a growing concern. These devices are typically charged via interfaces such as USB Type-C and Micro-USB. Since users may use these devices in a variety of environments, including humid ones, moisture protection at the charging interface becomes particularly important. To prevent electrical failures and safety incidents caused by moisture, many terminal devices have integrated moisture detection functions. Once moisture is detected at the charging interface, it automatically shuts down the subsequent charging circuit to prevent further damage.

[0003] Existing moisture detection protection solutions primarily rely on the end device's built-in sensors and control logic. When the device detects signs of moisture in the charging port, such as voltage level changes or signal anomalies caused by moisture, the system immediately stops supplying power to the battery. This solution has been widely adopted in many mobile phone products and is considered a relatively mature solution. Its core concept is to monitor the port status to determine whether it is wet and take protective measures accordingly.

[0004] However, while the existing solutions can shut down the downstream charging circuit within the terminal, they cannot shut down the power output from the charger adapter. This means that even if moisture is detected and charging is stopped, the charging port remains energized. In this case, moisture could cause a short circuit between the pins within the charging port, leading to corrosion or even permanent damage. Furthermore, the continued presence of voltage increases the risk of electric shock, posing a potential safety threat to users. Utility Model Content

[0005] In view of this, the embodiments of the present application provide a moisture detection protection circuit and a charger, the main purpose of which is to solve the technical problems that moisture can easily cause a short circuit between the pins in the charging interface, thereby causing corrosion or even permanent damage to the pins, and that continuous voltage can pose a safety threat to users.

[0006] According to one aspect of the present application, a moisture detection protection circuit is provided, which includes a detection control circuit and a moisture detection sensor. The detection control circuit is arranged inside the charging connector of the charger, and the moisture detection sensor is arranged inside the charging interface of the device terminal to be charged, wherein:

[0007] The input end of the detection control circuit is connected to the DC power output end of the charger via a power line. After the charging connector of the charger is connected to the charging interface of the device terminal, the output end of the detection control circuit is connected to the charging circuit of the device terminal via the power line. The control end of the detection control circuit is connected to the moisture detection sensor via the charging connector and the charging interface.

[0008] Among them, the moisture detection sensor is used to send a moisture detection signal to the detection control circuit after detecting the presence of moisture in the charging interface, and the detection control circuit is used to disconnect the power connection between the detection control circuit and the charging circuit after receiving the moisture detection signal.

[0009] In one embodiment, the detection control circuit includes a control module, a moisture detection module and a switch module, wherein the input end of the control module is connected to the output end of the moisture detection module, the output end of the control module is connected to the control end of the switch module, and the first end of the switch module is connected to the DC power supply output end of the charger; after the charging connector of the charger is connected to the charging interface of the device terminal, the input end of the moisture detection module is connected to the moisture detection sensor, and the second end of the switch module is connected to the charging circuit of the device terminal.

[0010] In one embodiment, the moisture detection module includes a first voltage-dividing resistor and a second voltage-dividing resistor, wherein the first voltage-dividing resistor and the second voltage-dividing resistor are connected in series between the DC power supply output terminal and the ground terminal of the charger, and the connection point between the first voltage-dividing resistor and the second voltage-dividing resistor is connected to the input terminal of the control module; after the charging connector of the charger is connected to the charging interface of the device terminal, the connection point between the first voltage-dividing resistor and the second voltage-dividing resistor is also connected to the moisture detection sensor.

[0011] In one embodiment, the switch module includes an N-channel field-effect transistor, the gate of the N-channel field-effect transistor is connected to the output end of the control module, and the source of the N-channel field-effect transistor is connected to the DC power supply output end of the charger; after the charging connector of the charger is connected to the charging interface of the device terminal, the drain of the N-channel field-effect transistor is connected to the charging circuit of the device terminal.

[0012] In one embodiment, the moisture detection sensor is a resistive humidity sensor or a humidity sensitive resistor.

[0013] In one embodiment, after detecting the presence of moisture in the charging interface, the moisture detection sensor sends the moisture detection signal to the detection control circuit in the charging connector through a signal line provided in the charging interface.

[0014] In one embodiment, after detecting the presence of moisture in the charging interface, the moisture detection sensor sends the moisture detection signal to the detection control circuit in the charging connector through a detection line independently provided in the charging interface.

[0015] In one embodiment, the moisture detection signal is a pulse signal or a level signal.

[0016] In one embodiment, the circuit also includes an audible and visual alarm circuit, wherein the audible and visual alarm circuit is connected to the detection control circuit, and the detection control circuit is further configured to output an alarm control signal to the audible and visual alarm circuit after receiving the moisture detection signal, so that the audible and visual alarm circuit issues an alarm prompt.

[0017] According to another aspect of the present application, a charger is provided, wherein the moisture detection protection circuit described in any one of the above embodiments is provided inside a charging connector of the charger.

[0018] By means of the above technical solution, the embodiment of the present application provides a moisture detection protection circuit and a charger. By setting a detection control circuit and a moisture detection sensor in the moisture detection protection circuit, and setting the detection control circuit inside the charging connector of the charger, and setting the moisture detection sensor inside the charging interface of the device terminal to be charged, the moisture detection sensor can promptly detect whether there is moisture in the charging interface, and when moisture is detected, promptly send a moisture detection signal to the detection control circuit so that the detection control circuit can promptly cut off the power connection between the detection control circuit and the charging circuit to ensure the safety of the subsequent circuit. The above moisture detection protection circuit can prevent the pins in the charging connector and the charging interface from corroding due to short circuit by cutting off the voltage output in the charging interface of the charger, thereby protecting the safety of the charging interface. This pre-protection design not only improves the moisture detection capability of the charging interface, but also effectively prevents the occurrence of potential problems such as pin short circuit and corrosion.

[0019] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0021] Figure 1 The following is a schematic diagram showing the structure of a moisture detection protection circuit provided by the prior art;

[0022] Figure 2 The following is a schematic diagram showing the structure of a moisture detection protection circuit provided by the prior art;

[0023] Figure 3 A schematic structural diagram of a moisture detection protection circuit provided in an embodiment of the present application is shown;

[0024] Figure 4 A schematic structural diagram of a moisture detection protection circuit provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0025] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0026] like Figure 1 As shown in FIG, in the existing moisture detection protection circuit, a common circuit design method is: integrating the moisture detection function inside the device terminal. When the device terminal detects that its charging interface (such as the type-C interface, micro-USB interface, etc.) is wet, it triggers the protection mechanism to shut down the subsequent charging circuit, such as Figure 1 However, in the above solution, although the charging circuit inside the device terminal can be turned off, the power transmitted from the power adapter to the charging interface cannot be effectively cut off. Therefore, under the influence of moisture, the pins of the charging interface may short-circuit and become charged, which may lead to corrosion of the pins and eventually cause circuit failure. Further, refer to Figure 2 Here's a brief explanation of the working principle of a conventional moisture detection protection circuit: A moisture detection sensor is installed inside the device's terminal interface. When the sensor detects water inside the charging port, its resistance changes. This causes the charger's power output terminal, VBUS, and ground pins to connect due to the moisture, resulting in a short circuit. In this short-circuit state, the combined effects of current and moisture cause electrolytic corrosion of these pins, damaging the device.

[0027] In order to solve the problem that the moisture detection protection circuit in the prior art easily causes corrosion of the charging interface pins, in one embodiment, Figure 3 As shown, a moisture detection protection circuit is provided, and the moisture detection protection circuit includes a detection control circuit 10 and a moisture detection sensor 20, wherein the detection control circuit 10 is arranged inside the charging connector of the charger, and the moisture detection sensor 20 is arranged inside the charging interface of the device terminal to be charged. In this embodiment, the input end of the detection control circuit 10 is connected to the DC power output end VBUS of the charger through a power line. After the charging connector of the charger is connected to the charging interface of the device terminal, the output end of the detection control circuit 10 is connected to the charging circuit of the device terminal through the power line, and the control end of the detection control circuit 10 is connected to the moisture detection sensor 20 through the charging connector and the charging interface. In this embodiment, the moisture detection sensor 20 can be used to send a moisture detection signal to the detection control circuit 10 after detecting the presence of moisture in the charging interface. The detection control circuit 10 can be used to disconnect the power connection between the detection control circuit 10 and the charging circuit after receiving the moisture detection signal. Figure 3 As shown in the cross-marked part. It can be understood that Figure 3 The moisture detection protection circuit shown is the circuit connection mode when the charging connector of the charger is connected to the charging interface of the device terminal. For ease of understanding, Figure 3 The charging connector and the charging interface are drawn separately, but in actual application scenarios, when the charging connector and the charging interface are in a connected state, the pin portion of the charging connector is set in the charging interface.

[0028] Specifically, in this embodiment, the input end of the detection control circuit 10 is connected to the DC power output end VBUS of the charger through a power line. After the charging connector of the charger is successfully connected to the charging interface of the device terminal, the output end of the detection control circuit 10 can be connected to the charging circuit of the device terminal through the power line, thereby charging the device terminal through the charging circuit. At the same time, the control end of the detection control circuit 10 can be connected to the moisture detection sensor 20 through the connection between the charging connector and the charging interface. During the charging process, the moisture detection sensor 20 set in the charging interface can perform moisture detection in real time. When the moisture detection sensor 20 detects the presence of moisture inside the charging interface, it can send a moisture detection signal to the detection control circuit 10 through the connection between the charging interface and the charging connector. After receiving this signal, the detection control circuit 10 can disconnect the power connection between the detection control circuit 10 and the charging circuit inside the terminal device, thereby avoiding the occurrence of pin corrosion problems caused by moisture in the charging interface.

[0029] It should be noted that the circuit connection method and device selection of each circuit module in the moisture detection protection circuit can be determined according to actual conditions and are not specifically limited in this embodiment. The circuit function of the moisture detection protection circuit provided in this embodiment is mainly realized through the circuit connection relationship between each circuit module, and does not rely on the implementation of the program module in a certain circuit module. In addition, each circuit module can be implemented by an analog circuit or a digital circuit, and for circuit modules that can be implanted with a program module, the implementation of its module function can be achieved by a program module provided by the prior art. For example, in this embodiment, the method for the detection control circuit to identify the moisture detection signal and control the disconnection of the moisture detection circuit from the charging circuit can both be implemented by a program module in the prior art and will not be repeated here.

[0030] The above embodiment sets a detection control circuit and a moisture detection sensor in the moisture detection protection circuit, sets the detection control circuit inside the charging connector of the charger, and sets the moisture detection sensor inside the charging interface of the device terminal to be charged. The moisture detection sensor can detect whether there is moisture in the charging interface, and when moisture is detected, it promptly sends a moisture detection signal to the detection control circuit so that the detection control circuit can promptly cut off the power connection between the detection control circuit and the charging circuit to ensure the safety of the subsequent circuit. The above moisture detection protection circuit can prevent the pins in the charging connector and the charging interface from corroding due to short circuits by cutting off the voltage output in the charging interface of the charger, thereby protecting the safety of the charging interface. This pre-protection design not only improves the moisture detection capability of the charging interface, but also effectively prevents the occurrence of potential problems such as pin short circuits and corrosion.

[0031] In one embodiment, Figure 4 As shown, the detection control circuit includes a control module 11, a moisture detection module 12 and a switch module 13, wherein the input end of the control module 11 is connected to the output end of the moisture detection module 12, the output end of the control module 11 is connected to the control end of the switch module 13, and the first end of the switch module 13 is connected to the DC power supply output end VBUS_IN of the charger; after the charging connector of the charger is connected to the charging interface of the device terminal, the input end of the moisture detection module 12 is connected to the moisture detection sensor 20, and the second end of the switch module 13 is connected to the charging circuit of the device terminal.

[0032] Specifically, the detection control circuit provided in this embodiment includes a control module 11, a moisture detection module 12, and a switch module 13. The input of the control module 11 is connected to the output of the moisture detection module 12, ensuring that the moisture detection signal is accurately transmitted to the control module 11. Furthermore, the output of the control module 11 is connected to the control terminal of the switch module 13, ensuring that upon receiving the moisture detection signal, the power connection between the detection control circuit and the charging circuit within the device terminal is promptly disconnected. Furthermore, after the charger's charging connector is successfully connected to the device terminal's charging interface, the input of the moisture detection module 12 can be connected to the moisture detection sensor 20 and begin performing moisture detection tasks. At this point, the first terminal of the switch module 13 is connected to the charger's DC power output terminal VBUS_IN, and the second terminal of the switch module 13 is connected to the device terminal's charging circuit. Based on this circuit connection, upon receiving the moisture detection signal, the detection control circuit can promptly control the switch module 13 to disconnect, thereby cutting off the power supply to the device terminal and protecting the electrical safety of subsequent circuits.

[0033] This embodiment, by incorporating a control module, a moisture detection module, and a switch module into the detection and control circuit, can accurately detect and quickly respond to moisture vapor in the charging port. Upon detecting moisture vapor, the detection and control circuit can quickly cut off the power supply, thereby preventing problems such as corrosion of the charging port pins. Furthermore, once the moisture vapor is eliminated, the detection and control circuit can automatically restore normal charging functionality, ensuring normal use of the device and enhancing the user experience.

[0034] In one embodiment, Figure 4 As shown, the moisture detection module 12 includes a first voltage-dividing resistor R1 and a second voltage-dividing resistor R2. The first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 are connected in series between the charger's DC power supply output terminal VBUS_IN and the ground terminal GND1. The connection point between the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 is connected to the input terminal of the control module 11. After the charger's charging connector is connected to the charging interface of the device terminal, the connection point between the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 is also connected to the moisture detection sensor 20.

[0035] Specifically, the moisture detection module 12 provided in this embodiment includes a first voltage-dividing resistor R1 and a second voltage-dividing resistor R2. The first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 are connected in series between the DC power output terminal VBUS_IN and the ground terminal GND1 of the charger to form a voltage-dividing circuit. Through this voltage-dividing circuit, the control module 11 can collect the voltage at the connection point between the two resistors in real time, and thereby obtain the voltage change output by the moisture detection sensor. Furthermore, after the charging connector of the charger is successfully connected to the charging interface of the device terminal, the connection point between the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 is connected to the moisture detection sensor 20. When moisture appears inside the charging interface, the sensitivity of the moisture detection sensor 20 will be affected, causing the voltage signal detected by the moisture detection module to change. This change will be transmitted to the control module 11, which will be further processed and judged by the control module 11.

[0036] The above embodiment achieves accurate detection and rapid response to moisture in the charging port by providing a voltage divider circuit consisting of two voltage divider resistors within the moisture detection module and connecting the connection point between the two voltage divider resistors to the moisture detection sensor and the control module. This circuit not only improves moisture detection accuracy but also makes the entire detection circuit more concise and efficient, while reducing circuit costs.

[0037] In one embodiment, Figure 4 As shown, the switch module includes an N-channel field effect transistor Q1. The gate of the N-channel field effect transistor Q1 is connected to the output terminal of the control module 11, and the source of the N-channel field effect transistor Q1 is connected to the DC power output terminal VBUS_IN of the charger. After the charging connector of the charger is connected to the charging interface of the device terminal, the drain of the N-channel field effect transistor Q1 is connected to the charging circuit of the device terminal.

[0038] Specifically, the switch module provided in this embodiment includes an N-channel field-effect transistor (FET) Q1. The gate of the N-channel FET Q1 is connected to the output of the control module 11, ensuring that the control module can accurately control the on / off switching of the FET. Furthermore, the source of the N-channel FET Q1 is connected to the charger's DC power output terminal, VBUS_IN, providing a stable power input for the entire circuit. After the charger's charging connector is successfully connected to the device's charging interface, the drain of the N-channel FET Q1 is connected to the device's charging circuit, forming a complete power supply path. When the control module 11 detects moisture in the charging interface, it can send a control signal to the FET via the gate of the N-channel FET Q1, thereby cutting off the power supply to the device.

[0039] This embodiment, by incorporating a field-effect transistor into the detection and control circuit, enables accurate detection and rapid response to moisture in the charging port. Upon detecting moisture, the detection and control circuit rapidly cuts off the power supply, effectively preventing problems such as corrosion of the charging port pins caused by moisture. This design also makes the entire circuit more concise and efficient, reducing circuit design costs.

[0040] In one embodiment, the moisture detection sensor is a resistive humidity sensor or a humidity sensitive resistor.

[0041] Specifically, this embodiment can use a resistive humidity sensor or a humidity-sensitive resistor as a moisture detection sensor. In this embodiment, the moisture detection sensor can be placed between the charging connector of the charger and the charging interface of the device terminal, or at a location closely connected to the charging interface, to ensure that the humidity changes of the charging interface and its surrounding environment can be accurately detected. Among them, the working principle of the resistive humidity sensor or humidity-sensitive resistor is based on the characteristic that its resistance value changes with humidity. In a dry environment, the resistance value of the sensor is relatively high; when the ambient humidity increases, the resistance value of the sensor will decrease accordingly. This change in resistance value can be converted into an electrical signal and transmitted to the control module through the circuit for processing, so that the control module can timely monitor the humidity changes near the charging interface and take corresponding measures.

[0042] This embodiment uses a resistive humidity sensor or humidity-sensitive resistor as a moisture detection sensor, combined with the real-time monitoring function of the control module, to accurately detect and quickly respond to moisture in the charging port. This design not only improves the safety and reliability of the charging port, but also provides users with a more convenient and secure charging experience.

[0043] In one embodiment, Figure 3 As shown, after the moisture detection sensor detects the presence of moisture in the charging interface, it can send a moisture detection signal to the detection control circuit in the charging connector through the signal line set in the charging interface.

[0044] Specifically, when the moisture detection sensor arranged inside the charging interface detects the presence of moisture in the charging interface, it can send a moisture detection signal to the detection control circuit located in the charging connector through preset signal lines in the charging interface, such as CC signal line, USB signal line, sub signal line, ID signal line and other signal lines, so that the detection control circuit can respond quickly, such as quickly cutting off the power output of the charging cable, etc., thereby preventing the pins of the charging interface from short-circuiting due to moisture.

[0045] This embodiment transmits the moisture detection signal via a preset signal line in the charging interface, thereby enabling accurate monitoring and rapid response to the moisture condition of the charging interface and reducing the cost of circuit design.

[0046] In one embodiment, Figure 3 As shown, after the moisture detection sensor detects the presence of moisture in the charging interface, it can send a moisture detection signal to the detection control circuit in the charging connector through a detection line independently set in the charging interface.

[0047] Specifically, when the moisture detection sensor inside the charging port detects moisture, it can send a moisture detection signal via a separate detection line reserved within the charging port to the detection control circuit located within the charging connector. This allows the detection control circuit to quickly respond, such as by quickly cutting off the power output from the charging cable, thereby preventing the charging port pins from shorting due to moisture. This design can prevent interference from other signals during signal transmission.

[0048] In this embodiment, a separate detection line is provided in the charging interface to transmit a moisture detection signal, thereby achieving accurate monitoring and rapid response to the moisture condition of the charging interface and reducing interference between signals.

[0049] In one embodiment, the moisture detection signal may be a pulse signal or a level signal.

[0050] Specifically, the moisture detection signal transmitted by the moisture detection sensor can take various forms, such as a pulse signal or a level signal. It is understood that the specific form of the moisture detection signal depends on the specific design of the moisture detection protection circuit. Pulse signals and level signals are both easy to detect, have stable transmission, and are highly resistant to interference, making them particularly suitable for moisture detection environments.

[0051] This embodiment uses a pulse signal or a level signal as a moisture detection signal, thereby enabling accurate monitoring and rapid response to moisture conditions at the charging interface.

[0052] In one embodiment, the above-mentioned moisture detection protection circuit also includes an audible and visual alarm circuit, wherein the audible and visual alarm circuit is connected to the detection control circuit, and the detection control circuit can also be used to output an alarm control signal to the audible and visual alarm circuit after receiving a moisture detection signal, so that the audible and visual alarm circuit will issue an alarm prompt.

[0053] Specifically, after receiving the moisture detection signal, the detection control circuit can also generate an alarm control signal, which can then be transmitted to the sound and light alarm circuit. After receiving the alarm control signal, the sound and light alarm circuit can activate the alarm function. The alarm function can include various methods such as emitting light signals and alarm sound signals to prompt the user's attention and remind the user that there is moisture in the charging interface. It should be noted that the method of the detection control circuit outputting the alarm control signal based on the moisture detection signal can be implemented by the program module provided by the existing technology, and this embodiment is not specifically limited here.

[0054] This embodiment incorporates an audible and visual alarm circuit within the moisture detection protection circuit to accurately monitor and promptly alert the user of moisture in the charging port. This circuit effectively improves the safety and reliability of the charging port and provides a more intuitive and convenient alarm prompt for the user.

[0055] In one embodiment, a charger is further provided, wherein a moisture detection protection circuit as described in any of the above embodiments is provided within a charging connector of the charger. For the specific implementation of the charger, reference may be made to the moisture detection protection circuit as described in any of the above embodiments, and no further details will be given here.

[0056] In the above embodiment, the moisture detection protection circuit can be built into the charger's charging cable plug. This design allows the charger to monitor the moisture level of the charging port and its surroundings in real time while providing power, effectively preventing circuit shorts, device damage, or safety hazards caused by moisture.

[0057] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A moisture detection protection circuit, characterized in that: The moisture detection protection circuit includes a detection control circuit and a moisture detection sensor. The detection control circuit is arranged inside the charging connector of the charger, and the moisture detection sensor is arranged inside the charging interface of the device terminal to be charged. The input end of the detection control circuit is connected to the DC power output end of the charger via a power line. After the charging connector of the charger is connected to the charging interface of the device terminal, the output end of the detection control circuit is connected to the charging circuit of the device terminal via the power line. The control end of the detection control circuit is connected to the moisture detection sensor via the charging connector and the charging interface. Among them, the moisture detection sensor is used to send a moisture detection signal to the detection control circuit after detecting the presence of moisture in the charging interface, and the detection control circuit is used to disconnect the power connection between the detection control circuit and the charging circuit after receiving the moisture detection signal.

2. The moisture detection protection circuit according to claim 1, characterized in that: The detection control circuit includes a control module, a moisture detection module and a switch module, wherein: The input end of the control module is connected to the output end of the moisture detection module, the output end of the control module is connected to the control end of the switch module, and the first end of the switch module is connected to the DC power supply output end of the charger; after the charging connector of the charger is connected to the charging interface of the device terminal, the input end of the moisture detection module is connected to the moisture detection sensor, and the second end of the switch module is connected to the charging circuit of the device terminal.

3. The moisture detection protection circuit according to claim 2, characterized in that: The moisture detection module includes a first voltage-dividing resistor and a second voltage-dividing resistor, wherein: The first voltage-dividing resistor and the second voltage-dividing resistor are connected in series between the DC power supply output terminal and the ground terminal of the charger, and the connection point between the first voltage-dividing resistor and the second voltage-dividing resistor is connected to the input terminal of the control module; after the charging connector of the charger is connected to the charging interface of the device terminal, the connection point between the first voltage-dividing resistor and the second voltage-dividing resistor is also connected to the moisture detection sensor.

4. The moisture detection protection circuit according to claim 2, characterized in that: The switch module includes an N-channel field effect transistor, wherein: The gate of the N-channel field effect transistor is connected to the output end of the control module, and the source of the N-channel field effect transistor is connected to the DC power supply output end of the charger; after the charging connector of the charger is connected to the charging interface of the device terminal, the drain of the N-channel field effect transistor is connected to the charging circuit of the device terminal.

5. The moisture detection protection circuit according to any one of claims 1 to 4, characterized in that: The humidity detection sensor is a resistive humidity sensor or a humidity sensitive resistor.

6. The moisture detection protection circuit according to claim 1, characterized in that: After detecting the presence of moisture in the charging interface, the moisture detection sensor sends the moisture detection signal to the detection control circuit in the charging connector through a signal line provided in the charging interface.

7. The moisture detection protection circuit according to claim 1, characterized in that: After detecting the presence of moisture in the charging interface, the moisture detection sensor sends the moisture detection signal to the detection control circuit in the charging connector through a detection line independently provided in the charging interface.

8. The moisture detection protection circuit according to claim 1, characterized in that: The moisture detection signal is a pulse signal or a level signal.

9. The moisture detection protection circuit according to claim 1, characterized in that: The circuit also includes an audible and visual alarm circuit, wherein the audible and visual alarm circuit is connected to the detection control circuit, and the detection control circuit is further configured to output an alarm control signal to the audible and visual alarm circuit after receiving the moisture detection signal, so that the audible and visual alarm circuit issues an alarm prompt.

10. A charger, characterized in that: The moisture detection protection circuit according to any one of claims 1 to 9 is provided inside the charging connector of the charger.

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