Water temperature detection circuit

Abstract

The utility model provides a water temperature detection circuit. A detection end of a water temperature detection module is connected with a water body to be detected; the power supply input module is connected with the input end of the anti-interference voltage reduction module; the power input module is used for outputting an initial power supply to the anti-interference voltage reduction module. The output end of the anti-interference voltage reduction module is connected with the power input end of the water temperature detection module, the power input end of the detection signal amplification module and the power input end of the water temperature data display module. The output end of the water temperature detection module is connected with the water temperature data display module, and the water temperature data display module is used for displaying water temperature data according to a first water temperature detection signal output by the water temperature detection module; the output end of the water temperature data display module is connected with the input end of the detection signal amplification module, and the detection signal amplification module is used for amplifying a second water temperature detection signal output by the water temperature data display module and outputting the second water temperature detection signal outwards.

Description

Technical Field

[0001] The utility model relates to the technical field of water temperature detection, and particularly relates to a water temperature detection circuit. Background Art

[0002] Instruments for detecting water temperature are closely related to people's lives and are an indispensable technology in people's lives. The impact of water temperature on society: In shopping malls, for the cooling towers of central air-conditioning systems, the water temperature in the cooling towers is measured to ensure the cooling effect and guarantee the normal operation of the central air-conditioning. For example, too high water temperature may lead to a decrease in the refrigeration efficiency of the air-conditioning, affecting the comfort level inside the shopping mall. In hospitals, in the disinfection supply room, the water temperature in high-pressure steam sterilization equipment is monitored to ensure that the temperature and pressure conditions required for sterilization are met. For example, the sterilization treatment of surgical instruments requires precise water temperature control. In the hemodialysis room, the water temperature of the dialysis fluid in the dialysis machine is measured to ensure the comfort and safety of patients during the treatment process. In the ward bathroom, it is ensured that the hot water temperature used by patients is appropriate to prevent scalding, etc. Among the instruments for detecting water temperature, one type belongs to the principle of using PT100 to detect temperature. By utilizing the characteristic that the resistance value of a platinum resistor changes with temperature and combining appropriate circuit design and measurement methods, the measurement of temperature is achieved. However, the power supply of existing water temperature detection devices is easily interfered with and is extremely unstable, which easily leads to poor stability of the water temperature detection results. Moreover, existing water temperature detection devices cannot simultaneously have multiple functions such as outputting a water temperature detection signal and displaying water temperature data. Therefore, existing water temperature detection devices have technical defects such as poor stability of water temperature detection results and single functions. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the defects and deficiencies in the prior art, and provide a water temperature detection circuit that can stably detect water temperature, and can also output a water temperature detection signal and display water temperature data simultaneously, increasing the functionality of the circuit.

[0004] An embodiment of the utility model provides a water temperature detection circuit, including: a power input module, an anti-interference step-down module, a water temperature detection module, a water temperature data display module, and a detection signal amplification module; the detection end of the water temperature detection module is connected to the water body to be detected;

[0005] The power input module is connected to the input end of the anti-interference step-down module; the power input module is used to output an initial power supply to the anti-interference step-down module;

[0006] The output terminals of the anti-interference step-down module are respectively connected to the power input terminal of the water temperature detection module, the power input terminal of the detection signal amplification module, and the power input terminal of the water temperature data display module; the anti-interference step-down module is used to step down and filter the initial voltage of the power input module to supply power to the water temperature detection module, the detection signal amplification module, and the water temperature data display module;

[0007] The output terminal of the water temperature detection module is connected to the water temperature data display module, and the water temperature data display module is used to display water temperature data according to the first water temperature detection signal output by the water temperature detection module; the output terminal of the water temperature data display module is connected to the input terminal of the detection signal amplification module, and the detection signal amplification module is used to amplify the second water temperature detection signal output by the water temperature data display module and output it externally.

[0008] Further, the anti-interference step-down module includes a first step-down chip and a first filtering unit;

[0009] The input terminal of the first step-down chip is connected to the power input module, and the output terminal of the first step-down chip is connected to the power input terminal of the water temperature detection module via the first filtering unit.

[0010] Further, the water temperature data display module includes: a step-down driving module and a water temperature data display module;

[0011] The output terminal of the first step-down chip is connected to the input terminal of the step-down driving module via the first filtering unit, and the output terminal of the step-down driving module is connected to the power input terminal of the water temperature data display module; the output terminal of the water temperature detection module is connected to the signal input terminal of the water temperature data display module, and the water temperature data display module is used to display water temperature data according to the first water temperature detection signal output by the water temperature detection module.

[0012] Further, the step-down driving module includes a second step-down chip and a second filtering unit;

[0013] The output terminal of the first step-down chip is connected to the input terminal of the second step-down chip via the first filtering unit, and the output terminal of the second step-down chip is connected to the power input terminal of the water temperature data display module via the second filtering unit.

[0014] Further, the water temperature data display module includes a single-chip microcomputer and a display device; the single-chip microcomputer includes a power input terminal, a signal input terminal, a first output terminal, a second output terminal, and a third output terminal, and the display device includes a device interface;

[0015] The output end of the second step-down chip is respectively connected to the power input end of the single-chip microcomputer and the power input end of the device interface via the second filtering unit; the output end of the water temperature detection module is connected to the signal input end of the single-chip microcomputer;

[0016] The first output end, the second output end and the third output end of the single-chip microcomputer are respectively connected to the device interface of the display device.

[0017] Further, the single-chip microcomputer further includes a fourth output end; the detection signal amplification module includes a boost driving module and a detection signal amplification module;

[0018] The output end of the first step-down chip is connected to the input end of the boost driving module via the first filtering unit, the output end of the boost driving module is connected to the power input end of the detection signal amplification module, the fourth output end of the single-chip microcomputer is connected to the signal input end of the detection signal amplification module, and the detection signal amplification module is used to amplify the second water temperature detection signal output from the fourth output end of the single-chip microcomputer and output it externally.

[0019] Further, the boost driving module includes a boost chip, the output end of the first step-down chip is connected to the input end of the boost chip via the first filtering unit, and the output end of the boost chip is connected to the power input end of the detection signal amplification module.

[0020] Further, the detection signal amplification module includes an operational amplifier chip, a water temperature current output end and a water temperature voltage output end; the operational amplifier chip includes a power input end, a first input end, a first output end and a second output end;

[0021] The output end of the boost driving module is connected to the power input end of the operational amplifier chip, the fourth output end of the single-chip microcomputer is connected to the first input end of the operational amplifier chip, the first output end of the operational amplifier chip is connected to the water temperature current output end, and the second output end of the operational amplifier chip is connected to the water temperature voltage output end.

[0022] Further, the water temperature detection module includes a step-down resistor, a water temperature detection unit, an amplification unit and a signal conversion chip;

[0023] The output end of the anti-interference step-down module is connected to the input end of the water temperature detection unit through the step-down resistor, the output end of the water temperature detection unit is connected to the input end of the amplification unit, the output end of the amplification unit is connected to the input end of the signal conversion chip, and the output end of the signal conversion chip is used to output the first water temperature detection signal.

[0024] Further, the first filtering unit includes a plurality of capacitors.

[0025] Further, the second filtering unit includes a plurality of capacitors.

[0026] Compared with the prior art, the utility model can achieve stable voltage reduction and stably output the working power supply after voltage reduction to the water temperature detection module, the detection signal amplification module, and the water temperature data display module through the anti-interference voltage reduction module, so that the water temperature detection module stably detects the ambient water temperature. Among them, the water temperature detection module includes a voltage reduction resistor, a water temperature detection unit, an amplification unit, and a signal conversion chip. Through the amplification unit and the signal conversion chip, the electrical signal output by the water temperature detection unit can be converted into a first water temperature detection signal to display the corresponding water temperature data through the water temperature data display module; and the water temperature data display module includes a voltage reduction driving module and a water temperature data display module, and the voltage reduction driving module can continue to provide stable power supply after voltage reduction for the water temperature data display module; the detection signal amplification module includes a boost driving module and a detection signal amplification module, and the boost driving module can provide stable power supply after boosting for the detection signal amplification module.

[0027] In order to understand the utility model more clearly, the following will describe the specific implementation manners of the present invention in conjunction with the accompanying drawings. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the water temperature detection circuit according to an embodiment of the utility model.

[0029] Figure 2 It is a circuit diagram of the anti-interference voltage reduction module of the water temperature detection circuit according to an embodiment of the utility model.

[0030] Figure 3 It is a circuit diagram of the water temperature detection module of the water temperature detection circuit according to an embodiment of the utility model.

[0031] Figure 4 It is a schematic diagram of the module connection of the water temperature detection circuit according to an embodiment of the utility model.

[0032] Figure 5 It is a circuit diagram of the voltage reduction driving module of the water temperature detection circuit according to an embodiment of the utility model.

[0033] Figure 6 It is a circuit diagram of the water temperature data display module of the water temperature detection circuit according to an embodiment of the utility model.

[0034] Figure 7 It is a circuit diagram of the boost driving module of the water temperature detection circuit according to an embodiment of the utility model.

[0035] Figure 8The circuit diagram of the detection signal amplification module of the water temperature detection circuit according to an embodiment of the present invention.

[0036] 1. Water temperature detection circuit; 11. Power input module; 13. Anti-interference step-down module; 15. Water temperature detection module; 17. Water temperature data display module; 171. Step-down drive module, 173. Water temperature data display module; 19. Detection signal amplification module; 191. Boost drive module; 193. Detection signal amplification module. Specific embodiments

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] Please refer to Figure 1 , which is a schematic diagram of the water temperature detection circuit 1 according to an embodiment of the present invention, including: a power input module 11, an anti-interference step-down module 13, a water temperature detection module 15, a water temperature data display module 17, and a detection signal amplification module 19; the detection end of the water temperature detection module 15 is connected to the water body to be detected;

[0039] The power input module 11 is connected to the input end of the anti-interference step-down module; the power input module 11 is used to output an initial power supply to the anti-interference step-down module 13;

[0040] The output end of the anti-interference step-down module 13 is respectively connected to the power input end of the water temperature detection module 15, the power input end of the detection signal amplification module 19, and the power input end of the water temperature data display module 17; the anti-interference step-down module 13 is used to step down and filter the initial voltage of the power input module 11 to supply power to the water temperature detection module 15, the detection signal amplification module 19, and the water temperature data display module 17;

[0041] The output end of the water temperature detection module 15 is connected to the water temperature data display module 17, and the water temperature data display module 17 is used to display water temperature data according to the first water temperature detection signal output by the water temperature detection module 15; the output end of the water temperature data display module 17 is connected to the input end of the detection signal amplification module 19, and the detection signal amplification module 19 is used to amplify the second water temperature detection signal output by the water temperature data display module 17 and output it externally.

[0042] Please refer toFigure 2 , in a feasible embodiment, the anti-interference step-down module 13 includes a first step-down chip and a first filtering unit;

[0043] The input end of the first step-down chip is connected to the power input module 11, and the output end of the first step-down chip is connected to the power input end of the water temperature detection module 15 via the first filtering unit.

[0044] Among them, the first filtering unit includes a plurality of capacitors.

[0045] Specifically, the second pin of the input end of the first step-down chip U5 is connected to the power input module 11. The second pin of the input end of the first step-down chip U5 also passes through the transient voltage suppression diode D2, the capacitor EC1, the capacitor C31 and the capacitor C2 respectively. The fourth pin of the input end of the first step-down chip U5 is grounded via the resistor R27. The first pin of the input end of the first step-down chip U5 is connected to the output end (SYS_5V) of the anti-interference step-down module 13 via the capacitor C29, the inductor L1 and the resistor R32. Among them, one end of the inductor L1 is grounded via the diode D3, one end of the inductor L1 is grounded via the resistors R26 and R28, one end of the resistor R32 is grounded via the capacitor C28, and the other end of the resistor R32 is grounded via the capacitors C30, EC2 and EC3 respectively; the eighth pin of the first step-down chip U5 is connected to the output end SYS_5V of the anti-interference step-down module 13 via the inductor L1 and the resistor R32; the seventh pin of the first step-down chip U5 is grounded, the sixth pin of the first step-down chip U5 is grounded via the resistor R4 and the capacitor C32, and the sixth pin of the first step-down chip U5 is also grounded via the capacitor C33; the fifth pin of the first step-down chip U5 is grounded due to a resistor R28.

[0046] Please refer to Figure 3 , in a feasible embodiment, the water temperature detection module 15 includes a step-down resistor, a water temperature detection unit, an amplification unit and a signal conversion chip;

[0047] The output end of the anti-interference step-down module 13 is connected to the input end of the water temperature detection unit through the step-down resistor. The output end of the water temperature detection unit is connected to the input end of the amplification unit. The output end of the amplification unit is connected to the input end of the signal conversion chip. The output end of the signal conversion chip is used to output the first water temperature detection signal.

[0048] The output terminal of the anti-interference step-down module 13 is connected to the first pin of the water temperature detection unit through resistors R2 and R66, and the first pin of the water temperature detection unit is connected to the non-inverting input terminal (the third pin) of the amplification unit U21.1 through resistor R70; the output terminal of the anti-interference step-down module 13 is connected to the second pin of the water temperature detection unit through resistors R2, R67 and R68, and the output terminal of the anti-interference step-down module 13 is connected to the inverting input terminal (the second pin) of the amplification unit U21.1 through resistors R2, R67 and R71. The third pin of the water temperature detection unit is grounded, and the fourth pin of the water temperature detection unit is connected to the water body to be detected; the inverting input terminal (the second pin) of the amplification unit U21.1 is connected to the output terminal (the first pin) of the amplification unit U21.1, and the output terminal (the first pin) of the amplification unit U21.1 is also connected to the third pin of the signal conversion chip U19 through resistor R73. Among them, the third pin of the signal conversion chip U19 is also grounded through diode D5 and capacitor C21 respectively; the first pin of the signal conversion chip U19 is connected to the eighth pin of the signal conversion chip U19 through resistor R69, the fourth and fifth pins of the signal conversion chip U19 are grounded, the seventh pin of the signal conversion chip U19 is connected to the output terminal SYS_5V of the anti-interference step-down module 13, and the seventh pin of the signal conversion chip U19 is grounded through capacitor U20; the sixth pin of the signal conversion chip U19 is used to output the first water temperature detection signal.

[0049] Please refer to Figure 4 , in a feasible embodiment, the water temperature data display module 17 includes: a step-down driving module 171 and a water temperature data display module 173;

[0050] The output terminal of the first step-down chip is connected to the input terminal of the step-down driving module 171 through the first filtering unit, and the output terminal of the step-down driving module 171 is connected to the power input terminal of the water temperature data display module 173; the output terminal of the water temperature detection module 15 is connected to the signal input terminal of the water temperature data display module 173, and the water temperature data display module 173 is used to display the water temperature data according to the first water temperature detection signal output by the water temperature detection module 15.

[0051] Please refer to Figure 5 , in a feasible embodiment, the step-down driving module 171 includes a second step-down chip and a second filtering unit;

[0052] The output terminal of the first step-down chip is connected to the input terminal of the second step-down chip through the first filtering unit, and the output terminal of the second step-down chip is connected to the power input terminal of the water temperature data display module 173 through the second filtering unit.

[0053] Specifically, the output terminal of the first step-down chip is connected to the input terminal of the second step-down chip U6 via the first filtering unit, as shown in Figure 5 the connection between the first pin of the second step-down chip U6 and the output terminal SYS_5V of the anti-interference step-down module 13 in Figure 5 . The first pin of the second step-down chip U6 is grounded via a capacitor C6; the second pin of the second step-down chip U6 is grounded, the third pin of the second step-down chip U6 is connected to the output terminal SYS_5V of the anti-interference step-down module 13 via a resistor R8, and the fifth pin of the second step-down chip U6 is grounded via two parallel capacitors C7 and C8 of the second filtering unit to serve as the output terminal SYS_3V3 of the step-down driving module 171.

[0054] Please refer to Figure 6 , in a feasible embodiment, the water temperature data display module 173 includes a single-chip microcomputer and a display device; the single-chip microcomputer includes a power input terminal, a signal input terminal, a first output terminal, a second output terminal, and a third output terminal, and the display device includes a device interface;

[0055] The output terminal of the second step-down chip is respectively connected to the power input terminal of the single-chip microcomputer and the power input terminal of the device interface via the second filtering unit; the output terminal of the water temperature detection module 15 is connected to the signal input terminal of the single-chip microcomputer;

[0056] The first output terminal, the second output terminal, and the third output terminal of the single-chip microcomputer are respectively connected to the device interface of the display device

[0057] Specifically, the second filtering unit includes a capacitor C22, a capacitor C23, a resistor R14, and a capacitor C24. Among them, the resistor R14 and the capacitor C24 form an RC series filtering unit. The output terminal SYS_3V3 of the second step-down chip is grounded via the RC series filtering unit, and the capacitor C22 and the capacitor C23 are respectively connected in parallel with the RC series filtering unit. On this basis, the output terminal SYS_3V3 of the second step-down chip is connected to the fourth pin (i.e., the power input terminal) of the single-chip microcomputer U22, the fifth pin of the single-chip microcomputer U22 is grounded, the sixth pin of the single-chip microcomputer U22 is grounded via a capacitor C24, the output terminal (the sixth pin of the signal conversion chip U19) of the water temperature detection module 15 is connected to the nineteenth pin of the single-chip microcomputer U22, and the first pin, the second pin, and the third pin of the single-chip microcomputer U22 are respectively connected to the third pin, the fourth pin, and the fifth pin of the device interface FPC1 of the display device. The sixth pin of the device interface FPC1 of the display device is connected to SYS_3V3. Optionally, the display device is a liquid crystal display device, and the device interface is a liquid crystal interface.

[0058] In a feasible embodiment, the single-chip microcomputer further includes a fourth output terminal; the detection signal amplification module 19 includes a boost driving module 191 and a detection signal amplification module 193;

[0059] The output terminal of the first step-down chip is connected to the input terminal of the boost driving module 191 via the first filtering unit. The output terminal of the boost driving module 191 is connected to the power input terminal of the detection signal amplification module 193. The fourth output terminal of the single-chip microcomputer is connected to the signal input terminal of the detection signal amplification module 193. The detection signal amplification module 193 is used to amplify the second water temperature detection signal output from the fourth output terminal of the single-chip microcomputer and output it externally.

[0060] Please refer to Figure 7 , in a feasible embodiment, the boost driving module 191 includes a boost chip. The output terminal of the first step-down chip is connected to the input terminal of the boost chip via the first filtering unit. The output terminal of the boost chip is connected to the power input terminal of the detection signal amplification module 193.

[0061] Specifically, the output terminal SYS_5V of the anti-interference step-down module 13 (i.e., the output terminal of the first step-down chip) is grounded via a capacitor C10. On this basis, the output terminal SYS_5V of the anti-interference step-down module 13 is respectively connected to the 5th pin and the 4th pin of the boost chip U7; the output terminal SYS_5V of the anti-interference step-down module 13 is also connected to the 1st pin of the boost chip U7 via an inductor L2. The 1st pin of the boost chip U7 outputs a boosted voltage via a diode D4 to serve as the output terminal of the boost driving module 191. Among them, the positive pole of the diode D4 is connected to the 1st pin of the boost chip U7, the negative pole of the diode D4 is grounded via a capacitor C27, the negative pole of the diode D4 is grounded via a resistor R33 and a resistor R34, a capacitor C9 is connected in parallel with the resistor R33, the 3rd pin of the boost chip U7 is grounded via a resistor R31 and a resistor R34, and the 2nd pin of the boost chip U7 is grounded.

[0062] Please refer to Figure 8 , in a feasible embodiment, the detection signal amplification module 193 includes an operational amplifier chip, a water temperature current output terminal, and a water temperature voltage output terminal; the operational amplifier chip includes a power input terminal, a first input terminal, a first output terminal, and a second output terminal;

[0063] The output terminal of the boost driving module 191 is connected to the power input terminal of the operational amplifier chip. The fourth output terminal of the single-chip microcomputer is connected to the first input terminal of the operational amplifier chip. The first output terminal of the operational amplifier chip is connected to the water temperature current output terminal. The second output terminal of the operational amplifier chip is connected to the water temperature voltage output terminal.

[0064] Specifically, the output terminal SYS_12V of the boost drive module 191 is connected to the 8th pin of the operational amplifier chip U4 via the resistor R24. The output terminal SYS_12V of the boost drive module 191 is also connected to the collector of the triode Q3. The base of the triode Q3 is connected to the 7th pin of the operational amplifier chip U4 via the resistor R39. The emitter of the triode Q3 is connected to the 6th pin of the operational amplifier chip U4 via the resistor R37. The 6th pin of the operational amplifier chip U4 is also grounded via the resistor R36. The emitter of the triode Q3 is connected to the 5th pin of the operational amplifier chip U4 via the resistors R41 and R38. Among them, the 5th pin of the operational amplifier chip U4 is also connected to T_A_INPUT via the resistor R35. The 5th pin of the operational amplifier chip U4 is connected to the water temperature current output terminal (T_OUT_A) via the resistor R38 and the fuse F4. And between the resistor R38 and the fuse F4, they are respectively grounded via the capacitor C35 and the Schottky diode D7. The 3rd terminal of the Schottky diode D7 is also connected to the output terminal SYS_12V of the boost drive module 191. The 15th pin (i.e., the fourth output terminal) of the single-chip microcomputer U22 is connected to the 3rd pin (i.e., the first input terminal) of the operational amplifier chip U4. The 4th pin of the operational amplifier chip U4 is grounded. The 2nd pin of the operational amplifier chip U4 is grounded via the resistors R23 and R42. The 1st pin of the operational amplifier chip U4 is connected to the 2nd pin of the operational amplifier chip U4 via the capacitor C25 and the resistor R22 respectively. The 1st pin of the operational amplifier chip U4 is also connected to the water temperature voltage output terminal (T_OUT_U) via the resistor R21 and the fuse F2. Between the resistor R21 and the fuse F2, they are respectively grounded via the capacitors C24, C23 and the Schottky diode D5. Among them, the 3rd terminal of the Schottky diode D5 is also connected to the output terminal SYS_12V of the boost drive module 191.

[0065] Compared with the prior art, the utility model can achieve stable voltage reduction and stably output the working power supply after voltage reduction to the water temperature detection module 15, the detection signal amplification module 19 and the water temperature data display module 17 through the anti-interference voltage reduction module 13, so that the water temperature detection module 15 stably detects the ambient water temperature. Among them, the water temperature detection module 15 includes a voltage reduction resistor, a water temperature detection unit, an amplification unit and a signal conversion chip. Through the amplification unit and the signal conversion chip, the electrical signal output by the water temperature detection unit can be converted into a first water temperature detection signal to display the corresponding water temperature data through the water temperature data display module 17; and the water temperature data display module 17 includes a voltage reduction driving module 171 and a water temperature data display module 173. Through the voltage reduction driving module 171, stable power supply after voltage reduction can be continuously provided for the water temperature data display module 173; the detection signal amplification module 19 includes a boost driving module 191 and a detection signal amplification module 193. Through the boost driving module 191, stable power supply after voltage boost can be provided for the detection signal amplification module 193.

[0066] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A water temperature detection circuit, characterized in that, Including: A power input module, an anti-interference step-down module, a water temperature detection module, a water temperature data display module, and a detection signal amplification module; the detection end of the water temperature detection module is connected to the water body to be detected; The power input module is connected to the input end of the anti-interference step-down module; the power input module is used to output an initial power supply to the anti-interference step-down module; The output end of the anti-interference step-down module is respectively connected to the power input end of the water temperature detection module, the power input end of the detection signal amplification module, and the power input end of the water temperature data display module; the anti-interference step-down module is used to step down and filter the initial voltage of the power input module to supply power to the water temperature detection module, the detection signal amplification module, and the water temperature data display module; The output end of the water temperature detection module is connected to the water temperature data display module, and the water temperature data display module is used to display water temperature data according to the first water temperature detection signal output by the water temperature detection module; the output end of the water temperature data display module is connected to the input end of the detection signal amplification module, and the detection signal amplification module is used to amplify the second water temperature detection signal output by the water temperature data display module and output it externally.

2. The water temperature detection circuit according to claim 1, wherein: The anti-interference step-down module includes a first step-down chip and a first filtering unit; The input end of the first step-down chip is connected to the power input module, and the output end of the first step-down chip is connected to the power input end of the water temperature detection module via the first filtering unit.

3. The water temperature detection circuit according to claim 2, wherein: The water temperature data display module includes: a step-down driving module and a water temperature data display module; The output end of the first step-down chip is connected to the input end of the step-down driving module via the first filtering unit, and the output end of the step-down driving module is connected to the power input end of the water temperature data display module; the output end of the water temperature detection module is connected to the signal input end of the water temperature data display module, and the water temperature data display module is used to display water temperature data according to the first water temperature detection signal output by the water temperature detection module.

4. The water temperature detection circuit according to claim 3, characterized in that: The step-down driving module includes a second step-down chip and a second filtering unit; The output end of the first step-down chip is connected to the input end of the second step-down chip via the first filtering unit, and the output end of the second step-down chip is connected to the power input end of the water temperature data display module via the second filtering unit.

5. The water temperature detection circuit according to claim 4, characterized in that: The water temperature data display module includes a single-chip microcomputer and a display device; the single-chip microcomputer includes a power input end, a signal input end, a first output end, a second output end, and a third output end, and the display device includes a device interface; The output end of the second step-down chip is respectively connected to the power input end of the single-chip microcomputer and the power input end of the device interface via the second filtering unit; the output end of the water temperature detection module is connected to the signal input end of the single-chip microcomputer; The first output end, the second output end, and the third output end of the single-chip microcomputer are respectively connected to the device interface of the display device.

6. The water temperature detection circuit according to claim 5, characterized in that: The single-chip microcomputer further includes a fourth output terminal; the detection signal amplification module includes a boost driving module and a detection signal amplification module; The output terminal of the first step-down chip is connected to the input terminal of the boost driving module via the first filtering unit, the output terminal of the boost driving module is connected to the power input terminal of the detection signal amplification module, the fourth output terminal of the single-chip microcomputer is connected to the signal input terminal of the detection signal amplification module, and the detection signal amplification module is used to amplify the second water temperature detection signal output from the fourth output terminal of the single-chip microcomputer and output it externally.

7. The water temperature detection circuit according to claim 6, wherein: The boost driving module includes a boost chip, the output terminal of the first step-down chip is connected to the input terminal of the boost chip via the first filtering unit, and the output terminal of the boost chip is connected to the power input terminal of the detection signal amplification module.

8. The water temperature detection circuit according to claim 6, wherein: The detection signal amplification module includes an operational amplifier chip, a water temperature current output terminal, and a water temperature voltage output terminal; the operational amplifier chip includes a power input terminal, a first input terminal, a first output terminal, and a second output terminal; The output terminal of the boost driving module is connected to the power input terminal of the operational amplifier chip, the fourth output terminal of the single-chip microcomputer is connected to the first input terminal of the operational amplifier chip, the first output terminal of the operational amplifier chip is connected to the water temperature current output terminal, and the second output terminal of the operational amplifier chip is connected to the water temperature voltage output terminal.

9. The water temperature detection circuit according to claim 1, wherein: The water temperature detection module includes a step-down resistor, a water temperature detection unit, an amplification unit, and a signal conversion chip; The output terminal of the anti-interference step-down module is connected to the input terminal of the water temperature detection unit through the step-down resistor, the output terminal of the water temperature detection unit is connected to the input terminal of the amplification unit, the output terminal of the amplification unit is connected to the input terminal of the signal conversion chip, and the output terminal of the signal conversion chip is used to output the first water temperature detection signal.

10. The water temperature detection circuit according to claim 2, characterized in that: The first filtering unit includes a plurality of capacitors.

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