Water-sensitive switch detection circuit

Abstract

The water-sensitive switch detection circuit provided by the utility model comprises a water-sensitive switch detection circuit and a protection plate switch controller. The protection plate comprises a front-end IC U1, a built-in LDO (Low Dropout Regulator) for outputting 3.3 V voltage to an MCU (Microprogrammed Control Unit) U2, C-and S1 are water tank water-sensitive input detection ports, M + and M-are motor output ports, and S2 is a motor output control port, when the water tank of the water machine is in a water-free state, a water tank water-sensitive terminal feeds back a water-sensitive switch detection signal, the brushless motor is not started, and the brushless motor is started; when the water tank of the water machine is full of water or has water, a detection signal is fed back to the water-sensitive switch through the water-sensitive terminal of the water tank, and the brushless motor is normally started to work.

Description

Technical Field

[0001] The present application belongs to the field of battery protection technology, and in particular relates to a water-sensitive switch detection circuit. Background Art

[0002] In the circuit design of the lithium battery industry, the detection scheme involving whether there is water in the water tank is generally detected through contact and non-contact liquid level sensors. When there is no water in the water tank, no water flows through the sensor. The sensor gives a signal reminder after detecting that there is no water. The sensor detection signal is fed back to the protection board and the control board. The protection board and the control board collect the signals. When there is water in the water tank or it is full of water, the sensor gives a signal reminder after detecting that there is water. The sensor detection signal is fed back to the protection board and the control board. The sensor module is used to detect the full water tank, the waterless state and the protection board switch control.

[0003] Traditional water level detection systems typically require multiple discrete components for water level monitoring and control, resulting in complex circuit design, high costs, and potential signal transmission delays and accuracy issues. In some applications, such as pumping or cooling systems, the operating status of the brushless motor must be linked to the water level in the tank. If the water level is too low or too high, the motor may need to be automatically stopped or adjusted. However, traditional control systems may struggle to respond quickly to water level changes, or their complex processing logic makes precise control difficult. Utility Model Content

[0004] In response to the above-mentioned defects of the prior art, the present application provides a water-sensitive switch detection circuit, which realizes the water tank full water, water-free state and protection board switch control through the water-sensitive switch detection circuit.

[0005] To achieve the above objectives, the present application provides a water-sensitive switch detection circuit, the circuit comprising:

[0006] Front-end IC U1 and main control unit MCU U2, water tank water sensitive input detection circuit and motor control circuit;

[0007] The front-end IC U1 supplies power to the main control unit MCU U2 and the water tank water sensitive input detection circuit;

[0008] One end of the water tank water sensitive input detection circuit is connected to the water tank, and the other end is connected to the main control unit MCU U2;

[0009] One end of the motor control circuit is connected to the main control unit MCU U2, and the other end is connected to the brushless motor.

[0010] Preferably, the front-end IC U1 includes:

[0011] The front-end IC U1 has a built-in low dropout voltage regulator LDO;

[0012] The front-end IC U1 converts the battery voltage or external power voltage into a stable 3.3V voltage.

[0013] Preferably, the water tank water sensitive input detection circuit includes: a resistor R1, a resistor R2 and a capacitor C1;

[0014] The resistor R1, the resistor R2 and the capacitor C1 are connected in parallel, and one end of each is connected to the node S1;

[0015] The other end of the resistor R1 is connected to the front-end IC U1 and the main control unit MCU U2 respectively;

[0016] The other end of the resistor R2 is connected to the S1_EN pin of the main control unit MCU U2.

[0017] Wherein, the water tank water sensitive input detection circuit also includes:

[0018] The other end of the capacitor C1 is connected to the water tank water sensitive input detection port C-.

[0019] Furthermore, the water tank water sensitive input detection circuit further includes: a resistor R3, a resistor R4;

[0020] One end of the resistor R3 is connected to the resistor R1 , and the other end is connected to the ground through the resistor R4 .

[0021] Furthermore, the water tank water-sensitive input detection circuit further includes: a capacitor C2;

[0022] The capacitor C2 is connected in parallel with the resistor R4; one end of the capacitor C2 and the resistor R4 is connected to the S1_ON pin of the main control unit MCU U2.

[0023] Preferably, the motor control circuit includes: a diode D1, a transistor Q1;

[0024] The anode of the diode D1 is connected to the S2_ON pin of the main control unit MCU U2;

[0025] The cathode of the diode D1 is connected to the b-pole of the transistor Q1;

[0026] The C-pole of the transistor Q1 is connected to the S2 end of the brushless motor;

[0027] The e-pole of the transistor Q1 is connected to the motor output port M-.

[0028] Wherein, the motor control circuit further includes: a resistor R5;

[0029] One end of the resistor R5 is connected to the C-pole of the transistor Q1 , and the other end is connected to the brushless motor S2 .

[0030] Furthermore, the motor control circuit further includes: a resistor R6;

[0031] One end of the resistor R6 is connected to the diode D1 , and the other end is connected to the b-terminal of the transistor Q1 .

[0032] Furthermore, the motor control circuit further includes: a resistor R7 and a capacitor C3;

[0033] One end of the resistor R7 is connected to the resistor R6, and the other end is connected to the b end of the transistor Q1;

[0034] One end of the capacitor C3 is connected to the resistor R5 , and the other end is connected to the ground.

[0035] A water-sensitive switch detection circuit proposed in this application first uses the metal terminals of the water-sensitive switch to be in water at the same time to form conduction, so that the detection circuit transmits a signal to the main control unit MCU U2 to determine whether there is water in the water tank; after the water tank water-sensitive detection signal is detected by the above-mentioned main control unit MCU U2, there is another NPN transistor, which uses the conduction condition of the transistor Vbe to realize motor control, thereby avoiding damage to the motor caused by lack of water or no water in the water tank.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] 1. Simplified hardware design and saved space.

[0038] 2. Simplified circuit design and reduced the complexity of production and maintenance.

[0039] 3. Enhanced system reliability and durability, and strong adaptability, capable of water level detection in different environments.

[0040] 4. The start and stop of the motor are strictly controlled by the water level, which enhances the intelligence and safety of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of the water machine working in one embodiment of the present application.

[0042] Figure 2 This is a water-sensitive switch detection circuit diagram in one embodiment of the present application. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] Currently, the lithium battery industry's circuits for detecting whether a water tank has water in it mostly rely on contact and non-contact liquid level sensor modules, which both take up space, impact the overall product footprint, and affect material costs. This application integrates the liquid level sensor detection module with a water-sensitive switch detection circuit to implement water tank fullness and water-free status detection and protection board switch control. This allows for both full and dry tank detection and protection board switch control functions, achieving both space optimization and cost savings.

[0045] The circuit for water-sensitive switch detection, when there is no water in the water tank of the water machine, the water-sensitive switch detection signal is fed back through the water tank water-sensitive terminal, and the brushless motor does not start. When the water tank of the water machine is full of water or has water, the water-sensitive switch detection signal is fed back through the water tank water-sensitive terminal, and the brushless motor starts and works normally.

[0046] As attached Figure 1-2 As shown, in order to solve the above technical problems, the present application provides a water-sensitive switch detection circuit.

[0047] The water-sensitive switch detection circuit described in this application specifically includes:

[0048] Front-end IC U1 and main control unit MCU U2, water tank water sensitive input detection circuit and motor control circuit;

[0049] The front-end IC U1 supplies power to the main control unit MCU U2 and the water tank water sensitive input detection circuit;

[0050] One end of the water tank water sensitive input detection circuit is connected to the water tank, and the other end is connected to the main control unit MCU U2;

[0051] One end of the motor control circuit is connected to the main control unit MCU U2, and the other end is connected to the brushless motor.

[0052] Preferably, the front-end IC U1 includes:

[0053] The front-end IC U1 has a built-in low dropout voltage regulator LDO;

[0054] The front-end IC U1 converts the battery voltage or external power voltage into a stable 3.3V voltage.

[0055] Preferably, the water tank water sensitive input detection circuit includes: a resistor R1, a resistor R2 and a capacitor C1;

[0056] The resistor R1, the resistor R2 and the capacitor C1 are connected in parallel, and one end of each is connected to the node S1;

[0057] The other end of the resistor R1 is connected to the front-end IC U1 and the main control unit MCU U2 respectively;

[0058] The other end of the resistor R2 is connected to the S1_EN pin of the main control unit MCU U2.

[0059] Wherein, the water tank water sensitive input detection circuit also includes:

[0060] The other end of the capacitor C1 is connected to the water tank water sensitive input detection port C-.

[0061] Furthermore, the water tank water sensitive input detection circuit further includes: a resistor R3, a resistor R4;

[0062] One end of the resistor R3 is connected to the resistor R1 , and the other end is connected to the ground through the resistor R4 .

[0063] Furthermore, the water tank water-sensitive input detection circuit further includes: a capacitor C2;

[0064] The capacitor C2 is connected in parallel with the resistor R4; one end of the capacitor C2 and the resistor R4 is connected to the S1_ON pin of the main control unit MCU U2.

[0065] Preferably, the motor control circuit includes: a diode D1, a transistor Q1;

[0066] The anode of the diode D1 is connected to the S2_ON pin of the main control unit MCU U2;

[0067] The cathode of the diode D1 is connected to the b-pole of the transistor Q1;

[0068] The C-pole of the transistor Q1 is connected to the S2 end of the brushless motor;

[0069] The e-pole of the transistor Q1 is connected to the motor output port M-.

[0070] Wherein, the motor control circuit further includes: a resistor R5;

[0071] One end of the resistor R5 is connected to the C-pole of the transistor Q1 , and the other end is connected to the brushless motor S2 .

[0072] Furthermore, the motor control circuit further includes: a resistor R6;

[0073] One end of the resistor R6 is connected to the diode D1 , and the other end is connected to the b-terminal of the transistor Q1 .

[0074] Furthermore, the motor control circuit further includes: a resistor R7 and a capacitor C3;

[0075] One end of the resistor R7 is connected to the resistor R6, and the other end is connected to the b end of the transistor Q1;

[0076] One end of the capacitor C3 is connected to the resistor R5 , and the other end is connected to the ground.

[0077] This application mainly improves the existing water level detection circuit of the water tank of the water machine. First, the metal terminals of the water-sensitive switch are placed in the water to form conduction, so that the detection circuit transmits a signal to the main control unit MCU U2 to determine whether there is water in the water tank. After the water-sensitive detection signal of the water tank is detected by the above-mentioned main control unit MCU U2, there is an NPN transistor, which uses the conduction condition of the transistor Vbe to realize the motor control and avoid the motor damage caused by lack of water or no water in the water tank. This application can ensure that the battery that has been turned off can be activated by selecting the appropriate capacitance value of C1. At the same time, it has the characteristics of being able to turn off when the charger is connected and there is no long-term uncontrollable charging current.

[0078] The specific embodiments described above further illustrate the objectives, technical solutions, and beneficial effects of this application. It should be understood that the above descriptions are merely specific embodiments of this application and are not intended to limit the scope of protection of this application. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application by those skilled in the art should be included within the scope of protection of this application.

Claims

1. A circuit for detecting a water-sensitive switch, characterized in that: The circuit for detecting the water-sensitive switch includes: Front-end IC U1 and main control unit MCU U2, water tank water sensitive input detection circuit and motor control circuit; The front-end IC U1 supplies power to the main control unit MCU U2 and the water tank water sensitive input detection circuit; One end of the water tank water sensitive input detection circuit is connected to the water tank, and the other end is connected to the main control unit MCU U2; One end of the motor control circuit is connected to the main control unit MCU U2, and the other end is connected to the brushless motor.

2. A water-sensitive switch detection circuit according to claim 1, characterized in that: The front-end IC U1 further includes: The front-end IC U1 has a built-in low dropout voltage regulator LDO; The front-end IC U1 converts the battery voltage or external power voltage into a stable 3.3V voltage.

3. A water-sensitive switch detection circuit according to claim 1, characterized in that: The water tank water sensitive input detection circuit includes: a resistor R1, a resistor R2 and a capacitor C1; The resistor R1, the resistor R2 and the capacitor C1 are connected in parallel, and one end of each is connected to the node S1; The other end of the resistor R1 is connected to the front-end IC U1 and the main control unit MCU U2 respectively; The other end of the resistor R2 is connected to the S1_EN pin of the main control unit MCU U2.

4. A water-sensitive switch detection circuit according to claim 3, characterized in that: The water tank water-sensitive input detection circuit further includes: The other end of the capacitor C1 is connected to the water tank water sensitive input detection port C-.

5. A water-sensitive switch detection circuit according to claim 4, characterized in that: The water tank water sensitive input detection circuit further includes: a resistor R3 and a resistor R4; One end of the resistor R3 is connected to the resistor R1 , and the other end is connected to the ground through the resistor R4 .

6. A water-sensitive switch detection circuit according to claim 5, characterized in that: The water tank water sensitive input detection circuit further includes: a capacitor C2; The capacitor C2 is connected in parallel with the resistor R4; one end of the capacitor C2 and the resistor R4 is connected to the S1_ON pin of the main control unit MCU U2.

7. A water-sensitive switch detection circuit according to claim 1, characterized in that: The motor control circuit includes: a diode D1, a transistor Q1; The anode of the diode D1 is connected to the S2_ON pin of the main control unit MCU U2; The cathode of the diode D1 is connected to the b-pole of the transistor Q1; The C-pole of the transistor Q1 is connected to the S2 end of the brushless motor; The e-pole of the transistor Q1 is connected to the motor output port M-.

8. A water-sensitive switch detection circuit according to claim 7, characterized in that: The motor control circuit further includes: a resistor R5; One end of the resistor R5 is connected to the C-pole of the transistor Q1 , and the other end is connected to the brushless motor S2 .

9. A water-sensitive switch detection circuit according to claim 8, characterized in that: The motor control circuit further includes: a resistor R6; One end of the resistor R6 is connected to the diode D1 , and the other end is connected to the b-terminal of the transistor Q1 .

10. A water-sensitive switch detection circuit according to claim 9, characterized in that: The motor control circuit further includes: a resistor R7 and a capacitor C3; One end of the resistor R7 is connected to the resistor R6, and the other end is connected to the b end of the transistor Q1; One end of the capacitor C3 is connected to the resistor R5 , and the other end is connected to the ground.

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