Water leakage detection circuit
By designing a leak detection circuit with a multi-stage comparison structure, and utilizing an adjustable reference voltage and a multi-stage comparator, the problems of universality and practicality caused by the fixed reference voltage in existing leak detection circuits are solved, achieving sensitive response and accurate leak detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI YUBANG SEMICON TECH CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-04-17
AI Technical Summary
The reference voltage in existing water leakage detection circuits is a fixed value, which cannot be flexibly adjusted according to different usage scenarios or sensor characteristics, thus limiting the versatility and practicality of the circuit.
A water leakage detection circuit was designed, which adopts a multi-stage comparison structure, including a water leakage sensor, a detection module, an amplification module, and a comparison output module. Through components such as dual comparators, field-effect transistors, operational amplifiers, and variable resistors, the reference voltage can be adjusted, thus forming a multi-stage comparison structure to improve sensitivity and accuracy.
It achieves sensitive response and accuracy in water leakage detection, and can adjust the sensitivity of the circuit according to the actual application scenario, thereby improving the applicability of the circuit in different environments and avoiding false judgments.
Smart Images
Figure CN224136813U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of water leakage detection technology, and specifically relates to a water leakage detection circuit. Background Technology
[0002] Currently, leak detection systems are widely used in residential, commercial buildings, and industrial equipment to monitor leaks in a timely manner and prevent water damage, equipment malfunctions, and safety hazards. Common leak detection devices typically include a leak sensor and signal processing circuitry, which can output alarm or control signals when a leak is detected.
[0003] However, the reference voltage used by the comparators in existing leak detection circuits is mostly a fixed value, which cannot be flexibly adjusted according to different usage scenarios or sensor characteristics, thus limiting the versatility and practicality of the circuit in various environments. Utility Model Content
[0004] In view of the above-mentioned problems in the prior art, the purpose of this utility model is to provide a water leakage detection circuit with an adjustable reference voltage and a multi-level comparison structure, which is reasonable in structure, sensitive in response, and highly adjustable.
[0005] A water leakage detection circuit includes a water leakage sensor, a detection module, an amplification module, and a comparison output module. The water leakage sensor is used to monitor in real time whether there is a water leakage in the detection area. The detection module is connected to the water leakage sensor and includes a dual-channel comparator U3 and a field-effect transistor Q1. The input terminals of the dual-channel comparator U3 are respectively connected to the water leakage signal from the water leakage sensor and a reference voltage. The output terminal of the dual-channel comparator U3 is connected to the field-effect transistor Q1. The field-effect transistor Q1 is connected to both the amplification module and the comparison output module. When the field-effect transistor Q1 is turned on, the amplification module and the comparison output module are connected. The input terminal of the amplification module is connected to the water leakage signal from the water leakage sensor. After amplification, the water leakage signal is input to the comparison output module through the turned-on field-effect transistor Q1 for voltage comparison. If the voltage exceeds the reference voltage, a DIO signal is driven to output, and a relay K1 is driven to switch the output status signal. At the same time, an LED D4 is driven to perform a light alarm. The reference voltage is adjustable.
[0006] Preferably, the gate of the field-effect transistor Q1 is connected to the output of the dual comparator U3, the drain of the field-effect transistor Q1 is connected to the input of the comparator output module, and the source of the field-effect transistor Q1 is connected to the output of the amplifier module.
[0007] Preferably, a diode D6 is also connected between the input and output terminals of the dual comparator U3.
[0008] Preferably, the amplification module includes an operational amplifier U1, the input of which is connected to the leakage signal of the leakage sensor, and the output is connected to the input of the comparison output module through a field-effect transistor Q1.
[0009] Preferably, the comparison output module includes a comparator U2, the inverting input of which is connected to the amplified leakage signal from the leakage sensor, and the non-inverting input is connected to a variable resistor R4. The reference voltage of the comparator U2 is adjusted by adjusting the resistance value of the variable resistor R4.
[0010] Preferably, the comparator output module includes a transistor Q3. The output terminal of the comparator U2 is connected to the transistor Q3 through a resistor R9. The collector of the transistor Q3 is grounded, and the emitter serves as the signal output terminal to output the DIO signal.
[0011] Preferably, the comparison output module includes a transistor Q2 and a relay K1. The output terminal of the comparator U2 is connected to the transistor Q2 through a diode D3 and a resistor R10 connected in series. The emitter of the transistor Q2 is grounded, and the collector is connected to the relay K1 and the light-emitting diode D4 respectively.
[0012] The beneficial effects of this invention are as follows: This leak detection circuit monitors the detection area in real time using a leak sensor and outputs a corresponding leak signal. First, a detection module makes a preliminary judgment on the leak signal. Then, an amplification module proportionally amplifies the signal to improve the ability to identify weak signals. Finally, a comparison output module compares the voltage of the amplified signal. When the amplified leak signal exceeds a reference voltage, multiple leak protection measures are activated. This detection circuit constitutes a multi-level comparison structure, making the detection results more accurate and effectively avoiding false judgments. Furthermore, its reference voltage is adjustable, allowing users to adjust the circuit sensitivity according to actual application scenarios, improving its overall applicability. Attached Figure Description
[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:
[0014] Figure 1 This is the circuit block diagram of this utility model;
[0015] Figure 2 This is the circuit diagram of this utility model. Detailed Implementation
[0016] Example 1
[0017] like Figure 1As shown, a water leakage detection circuit includes a water leakage sensor, a detection module, an amplification module, and a comparison output module. The water leakage sensor monitors the detection area in real time for any water leakage. The detection module checks if the signal output by the water leakage sensor exceeds a reference voltage. If it exceeds a threshold, the amplification module amplifies the signal transmitted by the water leakage sensor. The comparison output module then compares the amplified signal with the voltage. If the voltage exceeds the reference voltage, the circuit outputs a status signal of the water leakage sensor to the higher-level system and illuminates an indicator light to trigger a visual alarm.
[0018] like Figure 2 As shown, the detection module includes a dual-channel comparator U3 and a field-effect transistor Q1. The input terminals of the dual-channel comparator U3 are respectively connected to the leakage signal from the leakage sensor and the reference voltage. The output terminal is connected to the gate of the field-effect transistor Q1. The drain of the field-effect transistor Q1 is connected to the input terminal of the comparator output module, and the source of the field-effect transistor Q1 is connected to the output terminal of the amplifier module. The field-effect transistor Q1 is an SST113 NMOS transistor. When the leakage signal from the leakage sensor exceeds the reference voltage, the output terminal of the dual-channel comparator U3 outputs a high level, turning on the field-effect transistor Q1, thus connecting the output signal of the amplifier module to the input terminal of the comparator output module.
[0019] Specifically, a diode D6 is connected between the input and output terminals of the dual comparator U3 to prevent signal backflow. The reference voltage of the dual comparator U3 is provided by a voltage divider network connected to the power supply. The magnitude of the reference voltage is adjusted by setting the resistance value in the voltage divider network. The leakage signal from the leakage sensor is compared with the reference voltage to determine whether the leakage sensor has detected a leak, thereby driving subsequent modules to achieve leakage protection operation.
[0020] like Figure 2 As shown, the amplification module includes an operational amplifier U1. The input terminal of the operational amplifier U1 is connected to the leakage signal of the leakage sensor, and the output terminal is connected to the input terminal of the comparison output module through the field-effect transistor Q1. The operational amplifier U1 is used to amplify the leakage signal of the connected leakage sensor and transmit the amplified signal to the comparison output module.
[0021] Furthermore, the comparison output module includes comparator U2, transistor Q3, transistor Q2 and relay K1. The inverting input of comparator U2 is connected to the amplified leakage signal from the leakage sensor, and the non-inverting input is connected to a variable resistor R4. Adjusting the resistance value of the variable resistor R4 can adjust the reference voltage of comparator U2.
[0022] The output of comparator U2 is connected to transistor Q3 via resistor R9. The collector of transistor Q3 is grounded, and its emitter serves as the signal output terminal, outputting the DIO signal. When the amplified leakage signal from the leakage sensor exceeds the reference voltage, it drives transistor Q3 to conduct and output the DIO signal.
[0023] The output of comparator U2 is also connected to transistor Q2 via a series diode D3 and resistor R10. The emitter of transistor Q2 is grounded, and its collector is connected to relay K1 and LED D4. When the amplified leakage signal from the leakage sensor exceeds the reference voltage, it drives transistor Q2 to conduct, thereby driving LED D4 to light up. At the same time, it triggers relay K1 to switch, thus outputting the corresponding status signal to the upper-level system.
[0024] Working principle: When in use, the leak detection circuit uses a leak sensor to monitor the detection area for leaks in real time. The dual comparator U3 of the detection module compares the leak signal output by the leak sensor with the reference voltage to monitor the leak situation in real time.
[0025] When a leak occurs, the leak signal output by the leak sensor changes accordingly. At this point, when the leak signal output by the leak sensor exceeds the reference voltage of the dual-channel comparator U3, the drive MOSFET Q1 is turned on, causing comparator U3 in the comparison output module to receive the amplified signal output by operational amplifier U1 in the amplification module. Operational amplifier U1 is used to proportionally amplify the leak signal output by the leak sensor, facilitating voltage comparison by the comparison output module.
[0026] When the leakage signal output by the amplified leakage sensor is greater than the reference voltage of comparator U3, it drives transistor Q3 to conduct and outputs the DIO signal, and drives transistor Q2 to conduct, causing LED D4 to light up. At the same time, it causes relay K1 to jump and output the corresponding status signal to the upper-level system.
[0027] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A water leak detection circuit, characterized by, It includes a water leakage sensor, a detection module, an amplification module, and a comparison output module; the water leakage sensor is used to monitor in real time whether there is a water leakage in the detection area. The detection module is connected to the water leakage sensor. The detection module includes a dual comparator U3 and a field-effect transistor Q1. The input terminals of the dual comparator U3 are respectively connected to the water leakage signal of the water leakage sensor and the reference voltage. The output terminal of the dual comparator U3 is connected to the field-effect transistor Q1. The field-effect transistor Q1 is connected to the amplification module and the comparison output module respectively. When the field-effect transistor Q1 is turned on, the amplification module and the comparison output module are connected. The input terminal of the amplification module is connected to the leakage signal of the leakage sensor. After the leakage signal is amplified, it is input to the comparison output module through the conducting field-effect transistor Q1 for voltage comparison. If the voltage exceeds the reference voltage, the DIO signal is driven to output, and the relay K1 is driven to switch the output status signal. At the same time, the LED D4 is driven to perform a light alarm. The reference voltage is adjustable.
2. The water leak detection circuit of claim 1, wherein, The gate of the field-effect transistor Q1 is connected to the output of the dual comparator U3, the drain of the field-effect transistor Q1 is connected to the input of the comparator output module, and the source of the field-effect transistor Q1 is connected to the output of the amplifier module.
3. The water leak detection circuit of claim 1, wherein, A diode D6 is also connected between the input and output terminals of the dual comparator U3.
4. The water leak detection circuit of claim 1, wherein, The amplification module includes an operational amplifier U1, the input of which is connected to the leakage signal of the leakage sensor, and the output is connected to the input of the comparison output module through a field-effect transistor Q1.
5. The water leak detection circuit of claim 1, wherein, The comparison output module includes a comparator U2. The inverting input of the comparator U2 is connected to the amplified leakage signal from the leakage sensor, and the non-inverting input is connected to a variable resistor R4. The reference voltage of the comparator U2 is adjusted by adjusting the resistance value of the variable resistor R4.
6. The water leak detection circuit of claim 5, wherein, The comparison output module includes a transistor Q3. The output terminal of the comparator U2 is connected to the transistor Q3 through a resistor R9. The collector of the transistor Q3 is grounded, and the emitter serves as the signal output terminal to output the DIO signal.
7. The water leak detection circuit of claim 5, wherein, The comparison output module includes a transistor Q2 and a relay K1. The output terminal of the comparator U2 is connected to the transistor Q2 through a diode D3 and a resistor R10 connected in series. The emitter of the transistor Q2 is grounded, and the collector is connected to the relay K1 and the light-emitting diode D4 respectively.