Water inlet detection circuit and energy storage power supply

Abstract

The utility model belongs to the technical field of power electronics, and particularly relates to a water inflow detection circuit and an energy storage power supply. The water inlet detection circuit comprises a first switch module, a moisture detection module, a comparison module and a second switch module. The first switch module is used for conducting when the auxiliary power supply is powered on; the moisture detection module is used for outputting a first voltage based on the humidity in the environment when the first power supply is powered on and the first switch module is switched on; wherein the voltage value of the first voltage is in negative correlation with the humidity in the environment; the comparison module is used for outputting a first control signal when the first voltage is smaller than or equal to a preset threshold value; the second switch module is used for being switched on when receiving the first control signal and outputting a water inlet signal to external equipment. According to the invention, efficient early warning of the water inflow condition is realized, the safety of equipment is guaranteed, and the safety and stability of the equipment are improved.

Description

Technical Field

[0001] The present application belongs to the field of power electronics technology, and specifically relates to a water ingress detection circuit and an energy storage power supply. Background Art

[0002] When the energy storage power supply is used outdoors, if water enters the machine, it may cause machine malfunction.

[0003] Moisture entering a storage power supply can cause irreversible damage to its internal electronic components and circuits, potentially rendering the outdoor power supply irreparable and requiring replacement, increasing user costs. Furthermore, short circuits and overheating caused by water ingress can lead to fires or explosions. When used outdoors, users may not be able to detect these issues in time, increasing safety risks. Utility Model Content

[0004] The embodiments of the present application provide a water ingress detection circuit and an energy storage power supply, which achieve efficient early warning of water ingress, ensure equipment safety, and improve the safety and stability of the equipment.

[0005] In the first aspect, an embodiment of the present application provides a water inlet detection circuit, which includes a first switch module, a moisture detection module, a comparison module, and a second switch module; the control end of the first switch module is connected to an auxiliary power supply, and the first switch module is also connected to the moisture detection module, and the moisture detection module is also connected to the comparison module and the first power supply respectively, and the comparison module is also connected to the control end of the second switch module, and the second switch module is also connected to an external device; the first switch module is used to turn on when the auxiliary power supply is powered on; the moisture detection module is used to output a first voltage based on the humidity in the environment when the first power supply is powered on and the first switch module is turned on; wherein the voltage value of the first voltage is negatively correlated with the humidity in the environment; the comparison module is used to output a first control signal when the first voltage is less than or equal to a preset threshold; the second switch module is used to turn on when receiving the first control signal, and output a water inlet signal to the external device.

[0006] In some embodiments, the moisture detection module includes a moisture detection unit and a sampling unit; the moisture detection unit is respectively connected to the sampling unit, the first switch module, and the first power supply, and the sampling unit is also connected to the comparison module; the moisture detection unit is used to adjust its own resistance based on the humidity in the environment when the first power supply is powered on and the first switch module is turned on; wherein the resistance of the moisture detection unit is negatively correlated with the humidity in the environment; the sampling unit is used to collect the voltage across the moisture detection unit and output the first voltage based on the voltage across the moisture detection unit.

[0007] In some embodiments, the moisture detection unit includes a resistor Ri; the first switch module is connected to the first power supply through the resistor Ri, and the sampling unit is connected to both ends of the resistor Ri.

[0008] In some embodiments, the sampling unit includes a resistor R3, a resistor R5, a resistor R6, a resistor R7, and an amplifier U1B; the non-inverting input terminal of the amplifier U1B is connected to the first end of the moisture detection unit through the resistor R5, the non-inverting input terminal of the amplifier U1B is also grounded through the resistor R3, the inverting input terminal of the amplifier U1B is connected to the second end of the moisture detection unit through the resistor R6, the output terminal of the amplifier U1B is connected to the inverting input terminal of the amplifier U1B through the resistor R7, and the output terminal of the amplifier U1B is also connected to the comparison module.

[0009] In some embodiments, the first switch module includes a resistor R8, a resistor R9, and a switch tube Q1; the control end of the switch tube Q1 is connected to the auxiliary power supply through the resistor R8, the second end of the switch tube Q1 is grounded through the resistor R9, and the third end of the switch tube Q1 is connected to the moisture detection module.

[0010] In some embodiments, the first switch module further includes a voltage stabilizing diode DZ1 ; a cathode of the voltage stabilizing diode DZ1 is connected to the control terminal of the switch tube Q1 , and an anode of the voltage stabilizing diode DZ1 is grounded.

[0011] In some embodiments, the comparison module includes a resistor R1, a resistor R2, a resistor R4, and a comparator U2B; the inverting input terminal of the comparator U2B is connected to the moisture detection module, the non-inverting input terminal of the comparator U2B is connected to the first end of the resistor R1 and the second end of the resistor R2, the second end of the resistor R1 is grounded, the first end of the resistor R2 is connected to the first power supply, the output terminal of the comparator U2B is connected to the second end of the resistor R4, the first end of the resistor R4 is connected to the first power supply, and the output terminal of the comparator U2B is also connected to the control end of the second switch module.

[0012] In some embodiments, the comparison module further includes a diode D1; an anode of the diode D1 is connected to the output terminal of the comparator U2B, and a cathode of the diode D1 is connected to the control terminal of the second switch module.

[0013] In some embodiments, the second switching module includes a resistor R10 and a switch tube Q2; the control end of the switch tube Q2 is connected to the comparison module, the second end of the switch tube Q2 is grounded, the third end of the switch tube Q2 is connected to the first power supply through the resistor R10, and the third end of the switch tube Q2 is also connected to the external device.

[0014] In a second aspect, an embodiment of the present application provides an energy storage power supply, which includes the water inlet detection circuit as described above.

[0015] Different from related technical solutions, the present embodiment provides a water ingress detection circuit and energy storage power supply. The water ingress detection circuit includes a first switch module, a moisture detection module, a comparison module, and a second switch module. The control terminal of the first switch module is connected to an auxiliary power supply. The first switch module is also connected to the moisture detection module. The moisture detection module is also connected to the comparison module and the first power supply, respectively. The comparison module is also connected to the control terminal of the second switch module. The second switch module is also connected to an external device. The first switch module is configured to turn on when the auxiliary power supply is powered on. The moisture detection module is configured to output a first voltage based on the humidity in the environment when the first power supply is powered on and the first switch module is turned on. The voltage value of the first voltage is negatively correlated with the humidity in the environment. The comparison module is configured to output a first control signal when the first voltage is less than or equal to a preset threshold. The second switch module is configured to turn on upon receiving the first control signal and output a water ingress signal to the external device. In the present embodiment, the connection between the first switch module and the auxiliary power supply ensures that the entire detection process is initiated at the appropriate time, improving the orderliness and stability of circuit operation. Based on the ambient humidity, the moisture detection module outputs a first voltage that is negatively correlated with humidity. This allows for sensitive sensing of environmental changes, providing an accurate basis for water ingress detection. The comparison module determines the first voltage based on a preset threshold and outputs a first control signal when the humidity reaches a level indicating possible water ingress. This effectively distinguishes normal conditions from potential water ingress and reduces false alarms. Upon receiving the control signal, the second switch module outputs a water ingress signal to an external device, enabling it to promptly issue an alarm or take protective measures. Overall, this circuit provides efficient early warning of water ingress, ensuring device safety and improving both security and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0017] Figure 1This is a structural block diagram of a water inlet detection circuit provided in one embodiment of the present application;

[0018] Figure 2 This is a structural block diagram of a moisture detection module provided in one embodiment of the present application;

[0019] Figure 3 Schematic diagram of the circuit structure of a water inlet detection circuit provided in one embodiment of the present application. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0021] The technical features involved in the various embodiments of the present application described below do not conflict with each other and can be combined with each other.

[0022] When an element is referred to as being “connected to” another element, it can be directly connected to the other element, or one or more intervening elements may be present therebetween.

[0023] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "first," "second," and the like generally distinguish objects of a class and do not limit the number of objects. For example, the first object may be one or more.

[0024] See also Figure 1 , Figure 1 1 is a structural block diagram of a water inlet detection circuit 100 provided in one embodiment of the present application.

[0025] The water inlet detection circuit 100 provided in the embodiment of the present application includes a first switch module 10 , a moisture detection module 20 , a comparison module 30 , and a second switch module 40 .

[0026] Among them, the control end of the first switch module 10 is connected to the auxiliary power supply 200, the first switch module 10 is also connected to the moisture detection module 20, the moisture detection module 20 is also connected to the comparison module 30 and the first power supply 300 respectively, the comparison module 30 is also connected to the control end of the second switch module 40, and the second switch module 40 is also connected to the external device 400.

[0027] Specifically, the first switch module 10 is configured to turn on when the auxiliary power supply 200 is powered on. The moisture detection module 20 is configured to output a first voltage based on the ambient humidity when the first power supply 300 is powered on and the first switch module 10 is powered on; the first voltage is negatively correlated with the ambient humidity. The comparison module 30 is configured to output a first control signal when the first voltage is less than or equal to a preset threshold. The second switch module 40 is configured to turn on upon receiving the first control signal and output a water ingress signal to the external device 400.

[0028] The first voltage is a voltage signal output by the moisture detection module 20. The value of the first voltage is negatively correlated with the humidity in the environment, that is, the higher the humidity, the lower the value of the first voltage; and the lower the humidity, the higher the value of the first voltage.

[0029] The moisture detection module 20 usually works based on some humidity-sensitive materials. When the ambient humidity changes, the electrical properties (such as resistance, capacitance, etc.) of these materials will change.

[0030] The preset threshold is a benchmark used to distinguish between the voltage corresponding to normal ambient humidity and the voltage corresponding to humidity that indicates water intrusion. The preset threshold is related to the connections between the components in the circuit. By changing the connections between the components in the circuit, the preset threshold can be adjusted.

[0031] The first control signal is a signal output by the comparison module 30. When the first voltage is less than or equal to a preset threshold, the comparison module 30 outputs the first control signal for controlling the conduction of the second switch module 40.

[0032] The water inflow signal is a signal output by the second switch module 40 to the external device 400 after receiving the first control signal and being turned on, and is used to notify the external device 400 of water inflow. The water inflow signal can be a digital pulse signal, a high level signal or other forms of signals.

[0033] The external device 400 may be a microcontroller, and the water ingress signal may serve as an interrupt signal to cause the microcontroller to execute a corresponding water ingress protection program, such as cutting off the power supply of certain key circuits.

[0034] In actual application, first, the first power supply 300 is powered on, the auxiliary power supply 200 is powered on, and the control end of the first switch module 10 obtains power, thereby turning on the first switch module 10. At the same time, when the first switch module 10 is turned on, the moisture detection module 20 starts working.

[0035] Then, the moisture detection module 20 senses the humidity in the environment. Due to its characteristics, it outputs a first voltage based on the ambient humidity. For example, the moisture detection module 20 may operate using a humidity-sensitive resistor. In a dry environment, the resistance of the humidity-sensitive resistor is large. According to the voltage-dividing principle of a series circuit, the voltage across it (i.e., the first voltage) is high. When the ambient humidity increases, the resistance of the humidity-sensitive resistor decreases, and the voltage across it (i.e., the first voltage) also decreases. This is the principle that the first voltage is negatively correlated with the ambient humidity.

[0036] Next, the comparison module 30 receives the first voltage output by the moisture detection module 20 and compares it with a preset threshold. If the first voltage is less than or equal to the preset threshold, this indicates that the ambient humidity may have reached or exceeded a set level for water ingress. At this point, the comparison module 30 outputs a first control signal. For example, the comparison module 30 may be a voltage comparator. When the input first voltage is lower than the preset threshold, the voltage level at its output changes, thereby outputting the first control signal.

[0037] Finally, after receiving the first control signal output by the comparison module 30, the control terminal of the second switch module 40 is turned on according to this signal. After the second switch module 40 is turned on, it outputs a water inflow signal to the external device 400. The external device 400 can be an alarm device or a control system. Upon receiving the water inflow signal, it will take appropriate protective measures, such as shutting off the power supply to related equipment, to prevent further damage.

[0038] In the embodiment of the present application, the connection between the first switch module and the auxiliary power supply ensures that the entire detection process is started at the appropriate time, thereby improving the orderliness and stability of the circuit operation. The moisture detection module outputs a first voltage that is negatively correlated with the humidity based on the ambient humidity, and can sensitively sense environmental changes, providing an accurate basis for water ingress detection. The comparison module judges the first voltage based on a preset threshold value, and outputs a first control signal when the humidity reaches a level where water ingress may occur, effectively distinguishing between a normal environment and potential water ingress, and reducing false alarms. After receiving the control signal, the second switch module outputs a water ingress signal to the external device, so that the external device can promptly alarm or take protective measures. Overall, the circuit realizes efficient early warning of water ingress, ensures equipment safety, and improves the safety and stability of the equipment.

[0039] See also Figure 2 , Figure 2 This is a structural block diagram of the moisture detection module 20 provided in one embodiment of the present application.

[0040] In some embodiments, the moisture detection module 20 includes a moisture detection unit 21 and a sampling unit 22 .

[0041] The moisture detection unit 21 is connected to the sampling unit 22 , the first switch module 10 , and the first power supply 300 , respectively. The sampling unit 22 is also connected to the comparison module 30 .

[0042] Specifically, the moisture detection unit 21 is configured to adjust its resistance based on the ambient humidity when the first power supply 300 is powered on and the first switch module 10 is turned on. The resistance of the moisture detection unit 21 is negatively correlated with the ambient humidity. The sampling unit 22 is configured to collect the voltage across the moisture detection unit 21 and output a first voltage based on the voltage across the moisture detection unit 21.

[0043] The resistance of the moisture detection unit 21 is negatively correlated with the humidity in the environment, that is, the higher the humidity in the environment, the lower the resistance of the moisture detection unit 21; and the lower the humidity in the environment, the higher the resistance of the moisture detection unit 21.

[0044] The first voltage is a voltage signal output by the moisture detection module 20. The magnitude of the first voltage is positively correlated with the resistance of the moisture detection unit 21, that is, the magnitude of the first voltage is negatively correlated with the humidity in the environment. That is, the higher the humidity in the environment, the lower the resistance of the moisture detection unit 21, and the lower the magnitude of the first voltage; and the lower the humidity in the environment, the higher the resistance of the moisture detection unit 21, and the higher the magnitude of the first voltage.

[0045] See also Figure 3 , Figure 3 1 is a circuit structure diagram of a water inlet detection circuit 100 provided in an embodiment of the present application.

[0046] In some embodiments, the moisture detection unit 21 includes a resistor Ri.

[0047] The first switch module 10 is connected to the first power source 300 via the resistor Ri, and the sampling unit 22 is connected to both ends of the resistor Ri.

[0048] Resistor Ri is a humidity-sensitive resistor, also known as a moisture detection resistor. In a relatively dry environment, its resistance is large. According to Ohm's law (assuming a constant current), the voltage across it is high. When the humidity increases, the resistance decreases, and the voltage across it also decreases. This voltage change is the first voltage.

[0049] In some embodiments, the sampling unit 22 includes a resistor R3 , a resistor R5 , a resistor R6 , a resistor R7 , and an amplifier U1B.

[0050] Among them, the non-inverting input terminal of the amplifier U1B is connected to the first end of the moisture detection unit 21 through the resistor R5, the non-inverting input terminal of the amplifier U1B is also grounded through the resistor R3, the inverting input terminal of the amplifier U1B is connected to the second end of the moisture detection unit 21 through the resistor R6, the output terminal of the amplifier U1B is connected to the inverting input terminal of the amplifier U1B through the resistor R7, and the output terminal of the amplifier U1B is also connected to the comparison module 30.

[0051] In some embodiments, the first switch module 10 includes a resistor R8 , a resistor R9 , and a switch tube Q1 .

[0052] The control end of the switch tube Q1 is connected to the auxiliary power supply 200 through the resistor R8 , the second end of the switch tube Q1 is grounded through the resistor R9 , and the third end of the switch tube Q1 is connected to the moisture detection module 20 .

[0053] In this embodiment, the switch tube Q1 is an NPN transistor, for example, wherein the base of the NPN transistor is the control terminal of the switch tube Q1, the emitter of the NPN transistor is the second terminal of the switch tube Q1, and the collector of the NPN transistor is the third terminal of the switch tube Q1.

[0054] In addition, the switch tube Q1 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate-commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon-controlled rectifier (SCR) device, a junction-gate field-effect transistor (JFET) device, a MOS-controlled thyristor (MCT) device, etc.

[0055] In some embodiments, the first switch module 10 further includes a Zener diode DZ1 .

[0056] The cathode of the voltage stabilizing diode DZ1 is connected to the control end of the switch tube Q1 , and the anode of the voltage stabilizing diode DZ1 is grounded.

[0057] In some embodiments, the comparison module 30 includes a resistor R1 , a resistor R2 , a resistor R4 , and a comparator U2B.

[0058] Among them, the inverting input end of the comparator U2B is connected to the moisture detection module 20, the non-inverting input end of the comparator U2B is connected to the first end of the resistor R1 and the second end of the resistor R2, the second end of the resistor R1 is grounded, the first end of the resistor R2 is connected to the first power supply 300, the output end of the comparator U2B is connected to the second end of the resistor R4, the first end of the resistor R4 is connected to the first power supply 300, and the output end of the comparator U2B is also connected to the control end of the second switch module 40.

[0059] In some embodiments, the comparison module 30 further includes a diode D1 .

[0060] The anode of the diode D1 is connected to the output terminal of the comparator U2B, and the cathode of the diode D1 is connected to the control terminal of the second switch module 40 .

[0061] In some embodiments, the second switch module 40 includes a resistor R10 and a switch tube Q2.

[0062] The control end of the switch tube Q2 is connected to the comparison module 30 , the second end of the switch tube Q2 is grounded, the third end of the switch tube Q2 is connected to the first power supply 300 through the resistor R10 , and the third end of the switch tube Q2 is also connected to the external device 400 .

[0063] In this embodiment, the switch tube Q2 is an NPN transistor, for example, wherein the base of the NPN transistor is the control terminal of the switch tube Q2, the emitter of the NPN transistor is the second terminal of the switch tube Q2, and the collector of the NPN transistor is the third terminal of the switch tube Q2.

[0064] In addition, the switch tube Q2 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate-commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon-controlled rectifier (SCR) device, a junction-gate field-effect transistor (JFET) device, a MOS-controlled thyristor (MCT) device, etc.

[0065] The following combination Figure 3 The working principle of the water inlet detection circuit 100 is briefly described.

[0066] like Figure 3 As shown, Power_on is the auxiliary power signal. After the auxiliary power is turned on, Power_on is high (that is, the auxiliary power is powered on), and passes through resistor R8 to point V1. Since point V1 is high, the switch tube Q1 is turned on, and the diode ZD1 is a voltage regulator tube (for example, a 3V voltage regulator tube). At this time, the voltage across the resistor R9 is equal to Figure 3 The voltage at point V1 is subtracted by 0.7, and the voltage across resistor R9 is constant. The current I1 flowing through resistor R9 is equal to (V1-0.7) / R9, that is, the current flowing through R9 is constant. That is, from the first power supply ( Figure 3 Taking 3.3V as an example), resistor Ri, switch tube Q1, resistor R9 to ground GND, the current in this path is constant, that is, the current flowing through resistor Ri is constant.

[0067] When no moisture enters the machine (i.e., the humidity in the environment is low), the operational amplifier U1B detects that the voltage across the resistor Ri is V2 (i.e., the first voltage). Normally, the voltage at point V2 is greater than the voltage at point V3 (i.e., the preset threshold), and pin 7 (output) of the comparator U2B outputs a low level. Figure 3When point V4 is low, the switch Q2 is off, and point V5 is high. Point V5 is connected to an external device (for example, a CPU IO port). At this point, the external device knows the machine is operating normally and believes no moisture has entered the machine.

[0068] When moisture enters the machine (i.e., the humidity in the environment is high), the moisture affects resistor Ri, causing its resistance to decrease, and the voltage at point V2 (i.e., the first voltage) to decrease accordingly. When the voltage at point V2 is less than or equal to the preset threshold (i.e., the voltage at point V3), comparator U2B does not flip, and pin 7 (its output) of comparator U2B outputs a high level. Through diode D1, point V4 also reaches a high level (i.e., the first control signal), turning on switch Q2, thereby pulling point V5 down. An external device (e.g., a CPU) detects that point V5 is low, confirming that moisture has entered the machine, and issues a timely alarm to prevent damage.

[0069] The embodiment of the present application provides a water inlet detection circuit 100, which ensures that the entire detection process is started at the right time through the connection of the first switch module and the auxiliary power supply, thereby improving the orderliness and stability of the circuit operation. The moisture detection module outputs a first voltage that is negatively correlated with the humidity based on the ambient humidity, and can sensitively sense environmental changes, providing an accurate basis for water inlet detection. The comparison module judges the first voltage based on a preset threshold value, and outputs a first control signal when the humidity reaches a level where water ingress may occur, effectively distinguishing between a normal environment and potential water ingress, and reducing false alarms. After receiving the control signal, the second switch module outputs a water inlet signal to the external device, so that the external device can promptly alarm or take protective measures. Overall, the circuit realizes efficient early warning of water ingress, ensures equipment safety, and improves the safety and stability of the equipment.

[0070] In a second aspect, an embodiment of the present application provides an energy storage power supply, which includes the water inlet detection circuit 100 as described above.

[0071] Specifically, a water ingress detection circuit 100 can be installed at the fan inlet of the energy storage power supply, and another water ingress detection circuit 100 can be installed at the fan outlet. When rainwater enters the machine, the machine will alarm and notify the user when it is turned on. If there is no water ingress, no alarm will be issued, thereby preventing damage to the machine.

[0072] The structure and working principle of the water inlet detection circuit 100 can be referred to the above description and will not be repeated here.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the idea of ​​the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the present invention as described above. For the sake of simplicity, they are not provided in detail. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A water inlet detection circuit, characterized in that: The water inlet detection circuit includes a first switch module, a moisture detection module, a comparison module, and a second switch module; The control end of the first switch module is connected to the auxiliary power supply, the first switch module is also connected to the moisture detection module, the moisture detection module is also connected to the comparison module and the first power supply respectively, the comparison module is also connected to the control end of the second switch module, and the second switch module is also connected to an external device; The first switch module is configured to be turned on when the auxiliary power supply is powered on; The moisture detection module is configured to output a first voltage based on the humidity in the environment when the first power supply is powered on and the first switch module is turned on; wherein the voltage value of the first voltage is negatively correlated with the humidity in the environment; The comparison module is configured to output a first control signal when the first voltage is less than or equal to a preset threshold; The second switch module is configured to be turned on upon receiving the first control signal and output a water inlet signal to the external device.

2. The water inlet detection circuit according to claim 1, characterized in that: The moisture detection module includes a moisture detection unit and a sampling unit; The moisture detection unit is connected to the sampling unit, the first switch module, and the first power supply respectively, and the sampling unit is also connected to the comparison module; The moisture detection unit is configured to adjust its own resistance based on the humidity in the environment when the first power supply is powered on and the first switch module is turned on; wherein the resistance of the moisture detection unit is negatively correlated with the humidity in the environment; The sampling unit is used to collect the voltage across the moisture detection unit and output the first voltage based on the voltage across the moisture detection unit.

3. The water inlet detection circuit according to claim 2, characterized in that: The moisture detection unit includes a resistor Ri; The first switch module is connected to the first power supply through the resistor Ri, and the sampling unit is connected to both ends of the resistor Ri.

4. The water inlet detection circuit according to claim 2, characterized in that: The sampling unit includes a resistor R3, a resistor R5, a resistor R6, a resistor R7, and an amplifier U1B; The non-inverting input terminal of the amplifier U1B is connected to the first end of the moisture detection unit through the resistor R5, and the non-inverting input terminal of the amplifier U1B is also grounded through the resistor R3. The inverting input terminal of the amplifier U1B is connected to the second end of the moisture detection unit through the resistor R6. The output terminal of the amplifier U1B is connected to the inverting input terminal of the amplifier U1B through the resistor R7. The output terminal of the amplifier U1B is also connected to the comparison module.

5. The water inlet detection circuit according to claim 1, characterized in that: The first switch module includes a resistor R8, a resistor R9, and a switch tube Q1; The control end of the switch tube Q1 is connected to the auxiliary power supply through the resistor R8, the second end of the switch tube Q1 is grounded through the resistor R9, and the third end of the switch tube Q1 is connected to the moisture detection module.

6. The water inlet detection circuit according to claim 5, characterized in that: The first switch module further includes a voltage stabilizing diode DZ1; The cathode of the voltage stabilizing diode DZ1 is connected to the control end of the switch tube Q1 , and the anode of the voltage stabilizing diode DZ1 is grounded.

7. The water inlet detection circuit according to claim 1, characterized in that: The comparison module includes a resistor R1, a resistor R2, a resistor R4, and a comparator U2B; The inverting input terminal of the comparator U2B is connected to the moisture detection module, the non-inverting input terminal of the comparator U2B is connected to the first end of the resistor R1 and the second end of the resistor R2, the second end of the resistor R1 is grounded, the first end of the resistor R2 is connected to the first power supply, the output terminal of the comparator U2B is connected to the second end of the resistor R4, the first end of the resistor R4 is connected to the first power supply, and the output terminal of the comparator U2B is also connected to the control terminal of the second switch module.

8. The water inlet detection circuit according to claim 7, characterized in that: The comparison module further includes a diode D1; The anode of the diode D1 is connected to the output end of the comparator U2B, and the cathode of the diode D1 is connected to the control end of the second switch module.

9. The water inlet detection circuit according to claim 1, characterized in that: The second switch module includes a resistor R10 and a switch tube Q2; The control end of the switch tube Q2 is connected to the comparison module, the second end of the switch tube Q2 is grounded, the third end of the switch tube Q2 is connected to the first power supply through the resistor R10, and the third end of the switch tube Q2 is also connected to the external device.

10. An energy storage power supply, characterized in that: The energy storage power supply includes the water inlet detection circuit according to any one of claims 1 to 9.

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