Control circuit for intelligent water purifier

Abstract

The control circuit comprises a single-chip microcomputer, a Bluetooth module, a first display module and a second display module, the Bluetooth module is connected with a serial port of the single-chip microcomputer, the first display module is electrically connected with the single-chip microcomputer, the first display module is powered by a second direct-current power source, and the second display module is electrically connected with the single-chip microcomputer. The first display module is used for displaying customized pictures; the receiving and transmitting end of the second display module is electrically connected with the first display control end of the single-chip microcomputer, the clock end of the second display module is electrically connected with the clock control end of the single-chip microcomputer, and the data end of the second display module is electrically connected with the data control end of the single-chip microcomputer. The power supply end of the second display module is connected with the third direct-current power supply, and the second display module is used for displaying parameter information of the intelligent water purifier. A user can connect the Bluetooth module through an electronic device, and a customized picture set by the user is displayed through the first display module; the second display module can display parameter information of the intelligent water purifier, such as the whole machine state, the water quality condition and the service life of the filter element.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of water purifiers, in particular to a control circuit for an intelligent water purifier. BACKGROUND

[0002] A water purifier is a small water treatment device used to improve water quality. Its main function is to remove harmful substances such as impurities, bacteria, viruses, and heavy metals from tap water through a multi-stage filtration system, thereby providing safer and healthier drinking water. There are various types of water purifiers, including reverse osmosis (RO) water purifiers, nanofiltration water purifiers, and ultrafiltration water purifiers.

[0003] In addition, placing advertising content on a water purifier can help users learn about water drinking knowledge, such as healthy water drinking knowledge and water quality improvement effects, thereby providing valuable information and enhancing user experience without interfering with normal use. On the other hand, more and more users want to display more customized content through water purifiers, such as more personalized and thoughtful patterns and text. Therefore, the control circuit inside the existing intelligent water purifier still needs to be improved and optimized. INNOVATION CONTENT

[0004] To solve the above technical problems, the present application provides a control circuit for an intelligent water purifier, which includes a single-chip microcomputer, a Bluetooth module, a first display module, and a second display module. The Bluetooth module includes a chip ECB02S2, the serial port receiving end of which is electrically connected to the first serial port transmitting end of the single-chip microcomputer; the serial port transmitting end of the chip ECB02S2 is electrically connected to the first serial port receiving end of the single-chip microcomputer, and the power supply end of the chip ECB02S2 is electrically connected to a first direct current power supply; the first display module is electrically connected to the single-chip microcomputer, and is powered by a second direct current power supply, and the first display module displays a customized picture; the transceiving end of the second display module is electrically connected to the first display control end of the single-chip microcomputer, the clock end of the second display module is electrically connected to the clock control end of the single-chip microcomputer, and the data end of the second display module is electrically connected to the data control end of the single-chip microcomputer; the power supply end of the second display module is connected to a third direct current power supply, and the second display module is used to display parameter information of the intelligent water purifier.

[0005] In some embodiments of the present application, the control circuit for the intelligent water purifier further includes a first power conversion circuit, which includes a chip LM78M05, the input end of which is electrically connected to the second direct current power supply, and the output end of which outputs the third direct current power supply.

[0006] In some embodiments of the present application, the control circuit for the intelligent water purifier further comprises a second power conversion circuit, the second power conversion circuit comprises a chip HT7333, an input end of the chip HT7333 is electrically connected to the third DC power supply, and an output end of the chip HT7333 outputs the first DC power supply.

[0007] In some embodiments of the present application, the control circuit for the intelligent water purifier comprises an NFC module electrically connected to the single-chip microcomputer.

[0008] In some embodiments of the present application, the control circuit for the intelligent water purifier further comprises a raw water TDS detection circuit, the raw water TDS detection circuit is used for detecting a TDS value of raw water input into the intelligent water purifier; wherein the raw water TDS detection circuit comprises a raw water TDS sensor and a raw water detection triode, a power supply end of the raw water TDS sensor is electrically connected to a collector of the raw water detection triode, an emitter of the raw water detection triode is electrically connected to the third DC power supply, a base of the raw water detection triode is electrically connected to a raw water detection resistor and then connected to a raw water detection control end of the single-chip microcomputer; a signal end of the raw water TDS sensor is electrically connected to a first sampling voltage dividing resistor and then electrically connected to a raw water detection sampling end of the single-chip microcomputer, and the signal end of the raw water TDS sensor is also electrically connected to a second sampling voltage dividing resistor and then grounded.

[0009] In some embodiments of the present application, the control circuit for the intelligent water purifier further comprises a purified water TDS detection circuit, the purified water TDS detection circuit is used for detecting a TDS value of purified water formed after the raw water is filtered by the intelligent water purifier; wherein the purified water TDS detection circuit comprises a purified water TDS sensor, a power supply end of the purified water TDS sensor is electrically connected to the collector of the raw water detection triode, a signal end of the purified water TDS sensor is electrically connected to a third sampling voltage dividing resistor and then electrically connected to a purified water detection sampling end of the single-chip microcomputer, and the signal end of the purified water TDS sensor is also electrically connected to a fourth sampling voltage dividing resistor and then grounded.

[0010] In some embodiments of the present application, the control circuit for the intelligent water purifier further comprises a water inlet valve control circuit, the water inlet valve control circuit comprises a water inlet valve and a water inlet control field effect transistor, a positive electrode of the water inlet valve is electrically connected to the second DC power supply, a negative electrode of the water inlet valve is electrically connected to a drain of the water inlet control field effect transistor, a source of the water inlet control field effect transistor is grounded, a gate of the water inlet control field effect transistor is electrically connected to a first water inlet control resistor and then connected to a water inlet control end of the single-chip microcomputer, and the water inlet control end of the single-chip microcomputer is also electrically connected to a second water inlet control resistor and then grounded.

[0011] In some embodiments of the present application, the control circuit for the intelligent water purifier further comprises a plurality of state display circuits, each of which comprises a state display diode, the positive electrode of the state display diode being electrically connected to the third DC power supply, and the negative electrode of the state display diode being electrically connected to a state control terminal of the single-chip microcomputer.

[0012] In some embodiments of the present application, the control circuit for the intelligent water purifier comprises an Internet of Things module electrically connected to the single-chip microcomputer.

[0013] In some embodiments of the present application, the control circuit for the intelligent water purifier further comprises a water leakage detection circuit, which comprises a water leakage detection sensor, the power supply end of the water leakage detection sensor being electrically connected to a fourth DC power supply, the signal end of the water leakage detection sensor being electrically connected to a first water leakage detection resistor and then to a water leakage detection sampling terminal of the single-chip microcomputer, and the signal end of the water leakage detection sensor being electrically connected to a second water leakage detection resistor and then grounded.

[0014] The present application has the beneficial effects that the utility model discloses a control circuit for intelligent water purifier, including single-chip microcomputer, bluetooth module and first display module and second display module, bluetooth module and single-chip microcomputer serial port connection, first display module and single-chip microcomputer electricity is connected, and first display module is powered by second DC power supply, and first display module uses display custom picture, the transceiving end of second display module is electrically connected the first display control terminal of single-chip microcomputer, the clock end of second display module is electrically connected the clock control terminal of single-chip microcomputer, and the data end of second display module is electrically connected the data control terminal of single-chip microcomputer, the power supply end of second display module is connected third DC power supply, and second display module is used to display the parameter information of intelligent water purifier, user can connect bluetooth module through electronic equipment, and the custom picture set by user is shown through first display module, and second display module can display the parameter information of intelligent water purifier, for example, whole machine state, water quality condition, filter core life duration etc. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative effort based on these drawings.

[0016] Figure 1 is the waterway structure schematic view of the intelligent water purifier of the utility model;

[0017] Figure 2 is the schematic view of the single-chip microcomputer in the control circuit for the intelligent water purifier of the utility model;

[0018] Figure 3 is a schematic view of a Bluetooth module in a control circuit of the intelligent water purifier according to the present application;

[0019] Figure 4 is an electrical connection schematic view of a second display module and a single-chip microcomputer in a control circuit of the intelligent water purifier according to the present application;

[0020] Figure 5 is a schematic view of a raw water TDS detection circuit in a control circuit of the intelligent water purifier according to the present application;

[0021] Figure 6 is a schematic view of a purified water TDS detection circuit in a control circuit of the intelligent water purifier according to the present application;

[0022] Figure 7 is a schematic view of a water inlet valve control circuit in a control circuit of the intelligent water purifier according to the present application;

[0023] Figure 8 is a schematic view of a water leakage detection circuit in a control circuit of the intelligent water purifier according to the present application;

[0024] Figure 9 is a schematic view of a state display circuit in a control circuit of the intelligent water purifier according to the present application;

[0025] Figure 10 is a schematic view of a first power conversion circuit in a control circuit of the intelligent water purifier according to the present application;

[0026] Figure 11 is a schematic view of a second power conversion circuit in a control circuit of the intelligent water purifier according to the present application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other alternative embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0028] The present application provides an intelligent water purifier, Figure 1 is a schematic view of a water path structure inside the intelligent water purifier. As can be seen, the intelligent water purifier is internally provided with a PAC composite filter element 2 and a reverse osmosis membrane filter element 7. After the ball valve 1 is opened, raw water (input water source, which can be city tap water) is filtered by the PAC composite filter element 2 and the reverse osmosis membrane filter element 7 and then output purified water.

[0029] Furthermore, a low-pressure switch 3, a raw water TDS sensor 4, an inlet valve 5, and a booster pump 6 are installed on the water pipe between the PAC composite filter element 2 and the reverse osmosis membrane filter element 7. The low-pressure switch 3 is used to detect the raw water pressure. When the low-pressure switch 3 detects that the raw water pressure is lower than the set value, it indicates that the smart water purifier has entered a water shortage state. The raw water TDS sensor 4 is used to detect the TDS value of the raw water. After the inlet valve 5 is opened, the raw water filtered by the PAC composite filter element 2 can pass through the reverse osmosis membrane filter element 7. The booster pump 6 is used to increase the water pressure.

[0030] Furthermore, the outlet of the reverse osmosis membrane filter element 7 includes a wastewater outlet and a clean water outlet. The wastewater outlet of the reverse osmosis membrane filter element 7 is connected to the flushing valve 8 through a drain pipe. When the reverse osmosis membrane filter element 7 needs to be flushed, the inlet valve 5, the booster pump 6, and the flushing valve 8 are all opened to flush the reverse osmosis membrane filter element 7.

[0031] The purified water outlet of the reverse osmosis membrane filter element 7 is connected in sequence to the purified water TDS sensor 9, the high-pressure switch 10, and the gooseneck faucet 11 via a water pipe. The purified water TDS sensor 9 detects the TDS value of the purified water. When the gooseneck faucet 11 is turned on, the high-pressure switch 10 is turned on, and purified water can flow out of the gooseneck faucet 11.

[0032] This utility model also provides a control circuit for the aforementioned smart water purifier to control the electronic components inside the smart water purifier. In this application, the control circuit includes a microcontroller and an Internet of Things (IoT) module, a Bluetooth module, a first display module, and a second display module electrically connected to the microcontroller. This allows the smart water purifier to be used by users to purchase water via the IoT, such as by scanning a QR code. Users can connect to the Bluetooth module via an electronic device (e.g., a mobile phone) and display customized screens, such as images and text, on the first display module. Furthermore, the first display module can also display various functions or advertising information of the smart water purifier. The second display module displays parameter information of the smart water purifier, such as overall machine status, water quality, and filter life.

[0033] like Figure 2 As shown, Figure 2 This is a schematic diagram of the microcontroller in the control circuit, such as... Figure 3 As shown, Figure 3 This is a schematic diagram of a Bluetooth module, which includes a chip ECB02S2. The serial port receiver RXD of the ECB02S2 chip is electrically connected to diode D2 and then connected to... Figure 2 The first serial port transmitter P3.1 of the microcontroller; the serial port transmitter TXD of the ECB02S2 chip is electrically connected to resistor R19 and then connected to... Figure 2 The first serial port receiver P3.0 of the microcontroller and the data terminal STA of the ECB02S2 chip are electrically connected to resistor R16 and then connected to... Figure 2The Bluetooth data control end P3.2 of the single-chip microcomputer is electrically connected with the antenna end ANT of the chip ECB02S2; the power supply end of the chip ECB02S2 is electrically connected with the first direct current power supply +3.3V; and the antenna end ANT of the chip ECB02S2 is connected with the antenna through the antenna interface J4.

[0034] In the embodiment, the user can communicate with the Bluetooth module in the intelligent water purifier through the electronic device, and display the customized picture of the user, such as text, pattern and the like, through the single-chip microcomputer controlling the first display module. In the embodiment, the first display module is a display screen, and the first display module is powered by the second direct current power supply +24V.

[0035] Further, as shown in Figure 4 , in order to display the parameter information of the intelligent water purifier, such as the TDS values of raw water and purified water, the filter core life and the like, the control circuit further comprises a second display module electrically connected with the single-chip microcomputer. In the embodiment, the second display module is electrically connected with the interface J6, and the receiving and transmitting end (the second core of the interface J6) of the second display module is connected with the resistor R23 and then connected with Figure 4 the first display control end P3.5 of the single-chip microcomputer; the clock end (the third core of the interface J6) of the second display module is connected with the resistor R24 and then connected with Figure 2 the clock control end P3.5 of the single-chip microcomputer; the data end (the fourth core of the interface J6) of the second display module is connected with the resistor R25 and then connected with Figure 2 the data control end P3.7 of the single-chip microcomputer; and the power supply end (the sixth core of the interface J6) of the second display module is connected with the third direct current power supply +5V. Figure 2 Figure 2 Further, in order to facilitate the user to purchase water through the NFC module by using the electronic device, the control circuit for the intelligent water purifier comprises an NFC module electrically connected with the single-chip microcomputer. At the same time, the NFC module also facilitates the user to read the filter core information of the intelligent water purifier and set the water outlet parameter.

[0036] Further, as shown in , the control circuit detects the TDS value of the raw water input into the intelligent water purifier through the raw water TDS detection circuit; wherein the raw water TDS detection circuit comprises a raw water TDS sensor and a raw water detection triode Q1, and in the embodiment, the raw water TDS detection circuit is electrically connected with the raw water TDS sensor through the interface J2, the power supply end (the first core of the interface J2) of the raw water TDS sensor is electrically connected with the collector of the raw water detection triode Q1, the emitter of the raw water detection triode Q1 is electrically connected with the third direct current power supply +5V, and the base of the raw water detection triode Q1 is connected with the raw water detection resistor R10 and then connected with

[0037] the single-chip microcomputer. Figure 5 Figure 5 Figure 2 ​​The raw water detection control end P0.2 of the single-chip microcomputer is electrically connected with the signal end (the second core of the interface J2) of the raw water TDS sensor after the first sampling voltage division resistor Figure 2 The raw water detection sampling end P0.0 of the single-chip microcomputer is electrically connected with the signal end (the second core of the interface J2) of the raw water TDS sensor after the second sampling voltage division resistor R13 is electrically connected with the ground.

[0038] In the embodiment, when the single-chip microcomputer drives the raw water detection triode Q1 to be turned on, the collector of the raw water detection triode Q1 supplies power to the raw water TDS sensor, the signal end of the raw water TDS sensor transmits the sampled signal to the raw water detection sampling end P0.0 of the single-chip microcomputer, and the single-chip microcomputer displays the TDS value of the raw water through the second display module.

[0039] Further, as shown in Figure 6 , the control circuit detects the TDS value of the purified water formed after the raw water is filtered by the intelligent water purifier through a purified water TDS detection circuit; wherein the purified water TDS detection circuit includes a purified water TDS sensor, in Figure 6 , the purified water TDS detection circuit is electrically connected with the purified water TDS sensor through the interface J1, the power supply end (the first core of the interface J1) of the purified water TDS sensor is electrically connected with the collector of the raw water detection triode Q1, the signal end (the second core of the interface J1) of the purified water TDS sensor is electrically connected with the third sampling voltage division resistor R11 and then electrically connected with the purified water detection sampling end of the single-chip microcomputer, and the signal end of the purified water TDS sensor is also electrically connected with the fourth sampling voltage division resistor R14 and then grounded.

[0040] When the single-chip microcomputer drives the raw water detection triode Q1 to be turned on, the collector of the raw water detection triode Q1 also supplies power to the purified water TDS sensor, the signal end of the purified water TDS sensor transmits the sampled signal to the raw water detection sampling end P0.1 of the single-chip microcomputer, and the single-chip microcomputer displays the TDS value of the purified water through the second display module. It can be seen that the control circuit can measure the TDS values of the raw water and the purified water at the same time, and simplifies the circuit structure composition of the purified water TDS detection circuit, thereby saving costs.

[0041] Further, as shown in Figure 7 , the control circuit for the intelligent water purifier further includes a water inlet valve control circuit, the water inlet valve control circuit includes a water inlet valve and a water inlet control field effect transistor Q3, in Figure 7 , the water inlet valve control circuit is electrically connected with the water inlet valve through the interface J8, the positive electrode (the second core of the interface J8) of the water inlet valve is electrically connected with the second direct current power supply +24V, the negative electrode (the first core of the interface J8) of the water inlet valve is electrically connected with the drain electrode of the water inlet control field effect transistor Q3, the source electrode of the water inlet control field effect transistor Q3 is grounded, and the gate electrode of the water inlet control field effect transistor Q3 is electrically connected with the first water inlet control resistor R27 and then connected with Figure 2The water inlet control end P0.6 of the single-chip microcomputer is electrically connected to the second water inlet control resistor R35 and then grounded.

[0042] In the embodiment, when the water inlet control end P0.6 of the single-chip microcomputer controls the water inlet control field effect transistor Q3 to be turned on, the negative electrode of the water inlet valve is grounded, and the water inlet valve is opened. Figure 7 In the embodiment, the negative electrode of the water inlet valve (the first core of the interface J8) is also electrically connected to the protection diode D3 and then connected to the second DC power supply +24V. The positive electrode and the negative electrode of the protection diode D3 are also provided with the capacitor C11.

[0043] Further, in the embodiment, the control circuit for the intelligent water purifier further includes a flushing valve control circuit and a booster pump control circuit for controlling the opening or closing of the flushing valve and the booster pump, respectively. Figure 7 The flushing valve control circuit and the booster pump control circuit have the same circuit composition as the water inlet valve control circuit shown in the embodiment, and thus will not be described herein.

[0044] Further, in order to detect whether the intelligent water purifier has a water leakage phenomenon, as shown in Figure 8 , the control circuit for the intelligent water purifier further includes a water leakage detection circuit, which includes a water leakage detection sensor. Figure 8 In the embodiment, the water leakage detection circuit is electrically connected to the water leakage detection sensor through the interface J3. The power supply end (the second core of the interface J3) of the water leakage detection sensor is electrically connected to the resistor R8 and then connected to the fourth DC power supply lsjc_vcc (i.e. powered by the pin P4.2 of the single-chip microcomputer in the embodiment). Figure 2 The signal end (the first core of the interface J3) of the water leakage detection sensor is electrically connected to the first water leakage detection resistor R12 and then connected to the water leakage detection sampling end P4.1 of the single-chip microcomputer in the embodiment. Figure 2 The signal end (the first core of the interface J3) of the water leakage detection sensor is also electrically connected to the second water leakage detection resistor R15 and then grounded. In the embodiment, when the water leakage detection sensor contacts water, it indicates that the intelligent water purifier has a water leakage phenomenon. The signal end of the water leakage detection sensor sends a sampling signal to the water leakage detection sampling end P4.1 of the single-chip microcomputer, and the single-chip microcomputer can display the water leakage of the intelligent water purifier through the first display module or the second display module.

[0045] Further, as shown in Figure 9As shown, the control circuit for the intelligent water purifier further comprises a plurality of state display circuits, each of which comprises a state display diode (VL1-VL5), wherein VL1 represents a networking state signal lamp, VL2 represents a water full state signal lamp, VL3 represents a water making state signal lamp, VL4 represents a maintenance state signal lamp, and VL5 represents a flushing state signal lamp; specifically, taking the VL1 networking state signal lamp VL1 as an example, the positive electrode of the networking state signal lamp VL1 is electrically connected to the third DC power supply +5V, and the negative electrode of the networking state signal lamp VL1 is electrically connected to a resistor R1 Figure 2 The state control end P0.7 of the single-chip microcomputer controls the networking state signal lamp VL1 to emit light and display when the Internet of Things module is networked.

[0046] Further, as shown in Figure 10 and Figure 11 As shown, the control circuit for the intelligent water purifier further comprises a first power conversion circuit and a second power conversion circuit, wherein the first power conversion circuit comprises a chip LM78M05, the input end vin of the chip LM78M05 is electrically connected to the second DC power supply +24V, and the output end out of the chip LM78M05 outputs the third DC power supply +5V. The second power conversion circuit comprises a chip HT7333, the input end vin of the chip HT7333 is electrically connected to the third DC power supply +5V, and the output end of the chip HT7333 outputs the first DC power supply +3.3V. As can be seen, the first power conversion circuit can convert the second DC power supply +24V into the third DC power supply +5V, and the second power conversion circuit can convert the third DC power supply +5V into the first DC power supply +3.3V, thereby supplying power to each part of the control circuit.

[0047] Finally, it needs to be explained that if the application embodiments involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0048] In addition, if the application embodiments involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears to be contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope claimed by the present application.

[0049] The above merely provides the implementation of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation made by using the content of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A control circuit for a smart water purifier, characterized in that, The control circuit for the intelligent water purifier comprises a single-chip microcomputer, a Bluetooth module, a first display module and a second display module. The Bluetooth module comprises a chip ECB02S2, a first serial port sending end of the chip ECB02S2 is electrically connected to a first serial port receiving end of the single-chip microcomputer, a serial port receiving end of the chip ECB02S2 is electrically connected to a first serial port sending end of the single-chip microcomputer, and a power supply end of the chip ECB02S2 is electrically connected to a first direct-current power supply. The first display module is electrically connected to the single-chip microcomputer, is powered by a second direct-current power supply, and displays a customized picture. A receiving end of the second display module is electrically connected to a first display control end of the single-chip microcomputer, a clock end of the second display module is electrically connected to a clock control end of the single-chip microcomputer, a data end of the second display module is electrically connected to a data control end of the single-chip microcomputer, a power supply end of the second display module is connected to a third direct-current power supply, and the second display module is used for displaying parameter information of the intelligent water purifier.

2. The control circuit for the intelligent water purifier according to claim 1, wherein, The control circuit for the intelligent water purifier further comprises a first power conversion circuit, the first power conversion circuit comprises a chip LM78M05, an input end of the chip LM78M05 is electrically connected to the second direct-current power supply, and an output end of the chip LM78M05 outputs the third direct-current power supply.

3. The control circuit for the intelligent water purifier according to claim 2, wherein, The control circuit for the intelligent water purifier further comprises a second power conversion circuit, the second power conversion circuit comprises a chip HT7333, an input end of the chip HT7333 is electrically connected to the third direct-current power supply, and an output end of the chip HT7333 outputs the first direct-current power supply.

4. The control circuit for the intelligent water purifier according to any one of claims 1 to 3, characterized in that, The control circuit for the intelligent water purifier comprises an NFC module electrically connected to the single-chip microcomputer.

5. The control circuit for the intelligent water purifier according to claim 4, wherein, The control circuit for the intelligent water purifier further comprises a raw water TDS detection circuit, which is used for detecting a TDS value of raw water input into the intelligent water purifier. The raw water TDS detection circuit comprises a raw water TDS sensor and a raw water detection triode, a power supply end of the raw water TDS sensor is electrically connected to a collector of the raw water detection triode, an emitter of the raw water detection triode is electrically connected to the third direct-current power supply, a base of the raw water detection triode is electrically connected to a raw water detection resistor and then connected to a raw water detection control end of the single-chip microcomputer, a signal end of the raw water TDS sensor is electrically connected to a first sampling voltage dividing resistor and then electrically connected to a raw water detection sampling end of the single-chip microcomputer, and the signal end of the raw water TDS sensor is also electrically connected to a second sampling voltage dividing resistor and then grounded.

6. The control circuit for the intelligent water purifier according to claim 5, wherein, The control circuit for the intelligent water purifier further comprises a purified water TDS detection circuit, which is used for detecting a TDS value of purified water formed after the raw water is filtered by the intelligent water purifier. The water purification TDS detection circuit comprises a water purification TDS sensor, a power supply end of the water purification TDS sensor is electrically connected to the collector of the raw water detection triode, a signal end of the water purification TDS sensor is electrically connected to a third sampling voltage dividing resistor and then to a water purification detection sampling end of the single-chip microcomputer, and the signal end of the water purification TDS sensor is also electrically connected to a fourth sampling voltage dividing resistor and then grounded.

7. The control circuit for the intelligent water purifier according to claim 6, wherein, The control circuit for the intelligent water purifier further comprises a water inlet valve control circuit, the water inlet valve control circuit comprises a water inlet valve and a water inlet control field effect tube, a positive electrode of the water inlet valve is electrically connected to the second direct current power supply, a negative electrode of the water inlet valve is electrically connected to a drain electrode of the water inlet control field effect tube, a source electrode of the water inlet control field effect tube is grounded, a gate electrode of the water inlet control field effect tube is electrically connected to a first water inlet control resistor and then connected to a water inlet control end of the single-chip microcomputer, and the water inlet control end of the single-chip microcomputer is also electrically connected to a second water inlet control resistor and then grounded.

8. The control circuit for the intelligent water purifier according to claim 7, wherein, The control circuit for the intelligent water purifier further comprises a plurality of state display circuits, each state display circuit comprises a state display diode, a positive electrode of the state display diode is electrically connected to the third direct current power supply, and a negative electrode of the state display diode is electrically connected to a state control end of the single-chip microcomputer.

9. The control circuit for the intelligent water purifier according to claim 8, wherein, The control circuit for the intelligent water purifier comprises an Internet of Things module electrically connected to the single-chip microcomputer.

10. The control circuit for the intelligent water purifier according to claim 9, wherein, The control circuit for the intelligent water purifier further comprises a water leakage detection circuit, the water leakage detection circuit comprises a water leakage detection sensor, a power supply end of the water leakage detection sensor is electrically connected to a fourth direct current power supply, a signal end of the water leakage detection sensor is electrically connected to a first water leakage detection resistor and then connected to a water leakage detection sampling end of the single-chip microcomputer, and the signal end of the water leakage detection sensor is electrically connected to a second water leakage detection resistor and then grounded.

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