A control circuit for an internet of things water purifier

Abstract

The utility model discloses a control circuit for water purifier of internet of things, and control circuit includes control mainboard, and the rectangular shape of control mainboard has front panel and back panel, back panel is provided with singlechip and internet of things chip, and singlechip is connected with internet of things chip electricity, back panel's left side edge still is provided with antenna interface, and the first end, second end and third end of antenna interface are connected with first filter inductance, second filter inductance, third filter inductance access first resistance one end respectively, and the other end of first resistance is connected with the antenna end electricity of internet of things chip, still be equipped with ultraviolet disinfection circuit on control mainboard, and ultraviolet disinfection circuit is used for carrying out ultraviolet disinfection to water purifier of internet of things, in the utility model, control mainboard has the characteristics of small size, multiple functions, high integration.

Description

Technical Field

[0001] This application relates to the field of water purifier technology, and more specifically to a control circuit for an Internet of Things (IoT) water purifier. Background Technology

[0002] An IoT water purifier is a smart water purification solution that combines water purification equipment with Internet of Things (IoT) technology, enabling remote monitoring, data analysis, and intelligent management via the internet. It not only possesses the efficient purification function of traditional water purifiers but also enhances user experience and water resource management efficiency through intelligent design. However, in current technology, the internal control circuitry of IoT water purifiers still requires improvement and optimization. Utility Model Content

[0003] To address the aforementioned technical problems, this application provides a control circuit for an IoT water purifier. The control circuit includes a control motherboard, which is rectangular in shape and has a front panel and a back panel. The back panel houses a microcontroller and an IoT chip, with the microcontroller electrically connected to the IoT chip. An antenna interface is also located on the left edge of the back panel. The first, second, and third ends of the antenna interface are electrically connected to one end of a first filter inductor, a second filter inductor, and a third filter inductor connected to one end of a first resistor, respectively. The other end of the first resistor is electrically connected to the antenna terminal of the IoT chip. The control motherboard also includes an ultraviolet (UV) disinfection circuit, comprising a disinfection interface and a disinfection control field-effect transistor (FET). The disinfection interface is located on the top edge of the front panel and has a positive and a negative terminal, respectively used to electrically connect to the positive and negative terminals of a disinfection lamp. The positive terminal of the disinfection interface is also electrically connected to a first DC power supply. The negative terminal of the disinfection interface is electrically connected to the drain of the disinfection control FET, the source of the disinfection control FET is grounded, and the gate of the disinfection control FET is electrically connected to the disinfection control terminal of the microcontroller.

[0004] In some embodiments, the control circuit further includes an encoding display circuit, which includes a first blue light-emitting diode and a first red light-emitting diode, both disposed on the front panel. The positive terminal of the first blue light-emitting diode is electrically connected to the first encoding control terminal of the microcontroller, and the negative terminal of the first blue light-emitting diode is grounded. The positive terminal of the first red light-emitting diode is electrically connected to the second encoding control terminal of the microcontroller, and the negative terminal of the first red light-emitting diode is grounded.

[0005] In some embodiments, the control circuit further includes a high-level switch interface and a low-level switch interface disposed on the top edge of the front panel. The high-level switch interface and the low-level switch interface are both electrically connected to the microcontroller and are used to connect the high-level switch and the low-level switch, respectively.

[0006] In some embodiments, the control circuit further includes a raw water TDS detection circuit, which includes a raw water TDS interface disposed on the top edge of the front panel. The raw water TDS interface is used to connect to a raw water TDS analyzer. The power supply terminal of the raw water TDS interface is electrically connected to the collector of a raw water detection transistor. The emitter of the raw water detection transistor is electrically connected to a second DC power supply. The base of the raw water detection transistor is electrically connected to a raw water detection resistor and then connected to the raw water detection control terminal of the microcontroller. The sampling terminal of the raw water TDS interface is electrically connected to a first sampling voltage divider resistor and then electrically connected to the raw water detection sampling terminal of the microcontroller. The sampling terminal of the raw water TDS interface is also electrically connected to a second sampling voltage divider resistor and then grounded.

[0007] In some embodiments, the control circuit further includes a pure water TDS detection circuit, which includes a pure water TDS interface disposed on the top edge of the front panel. The pure water TDS interface is used to connect to a pure water TDS analyzer. The power supply terminal of the pure water TDS interface is electrically connected to the collector of a pure water detection transistor. The emitter of the pure water detection transistor is electrically connected to a second DC power supply. The base of the pure water detection transistor is electrically connected to a pure water detection resistor and then connected to the pure water detection control terminal of the microcontroller. The sampling terminal of the pure water TDS interface is electrically connected to a third sampling voltage divider resistor and then electrically connected to the pure water detection sampling terminal of the microcontroller. The sampling terminal of the pure water TDS interface is also electrically connected to a fourth sampling voltage divider resistor and then grounded.

[0008] In some embodiments, the control circuit further includes a power supply circuit, which includes a power interface and a voltage conversion chip. The power interface is disposed at the top edge of the front panel and is used to introduce the first DC power supply. The voltage conversion chip is disposed on the back panel, with its input terminal electrically connected to the positive terminal of the power interface and its output terminal outputting the second DC power supply.

[0009] In some embodiments, the control circuit further includes an alarm circuit, which includes a buzzer disposed on the front panel. The positive terminal of the buzzer is electrically connected to the first DC power supply, the negative terminal of the buzzer is electrically connected to the collector of the alarm control transistor, the base of the alarm control transistor is electrically connected to the alarm control terminal of the microcontroller after being connected to the first alarm voltage divider resistor, and the base of the alarm control transistor is also electrically connected to the ground after being connected to the second alarm voltage divider resistor.

[0010] In some embodiments, the control circuit further includes a flow detection circuit, which includes a flow detection interface for connecting a flow meter. The flow detection interface is located at the top edge of the front panel. The power supply terminal of the flow detection interface is electrically connected to a second DC power supply. The signal terminal of the flow detection interface is electrically connected to a first flow detection resistor and a second flow detection resistor and then connected to the second DC power supply. The electrical connection between the first flow detection resistor and the second flow detection resistor is electrically connected to the flow sampling terminal of the microcontroller.

[0011] In some embodiments, the control motherboard is further provided with a water pump circuit, which includes a water pump interface and a water pump control field-effect transistor. The water pump interface is located at the top edge of the front panel and has a positive and a negative terminal, which are used to electrically connect to the positive and negative terminals of the water pump, respectively. The positive terminal of the water pump interface is also electrically connected to the first DC power supply, and the negative terminal of the water pump interface is electrically connected to the drain of the water pump control field-effect transistor. The source of the water pump control field-effect transistor is grounded, and the gate of the water pump control field-effect transistor is electrically connected to the water pump control terminal of the microcontroller.

[0012] In some embodiments, the control motherboard is further provided with a water inlet valve circuit, which includes a water inlet valve interface and a water inlet valve control field-effect transistor. The water inlet valve interface is located at the top edge of the front panel and has a positive and a negative terminal, which are used to electrically connect to the positive and negative terminals of the water inlet valve, respectively. The positive terminal of the water inlet valve interface is also electrically connected to the first DC power supply, and the negative terminal of the water inlet valve interface is electrically connected to the drain of the water inlet valve control field-effect transistor. The source of the water inlet valve control field-effect transistor is grounded, and the gate of the water inlet valve control field-effect transistor is electrically connected to the water inlet control terminal of the microcontroller.

[0013] The beneficial effects of this application are as follows: This utility model discloses a control circuit for an IoT water purifier. The control circuit includes a control motherboard, which is rectangular in shape and has a front panel and a back panel. The back panel is equipped with a microcontroller and an IoT chip, and the microcontroller and the IoT chip are electrically connected. An antenna interface is also provided on the left edge of the back panel. The first, second, and third ends of the antenna interface are electrically connected to a first filter inductor, a second filter inductor, and a third filter inductor connected to one end of a first resistor, respectively. The other end of the first resistor is electrically connected to the antenna end of the IoT chip. The control motherboard is also equipped with an ultraviolet disinfection circuit, which is used to disinfect the IoT water purifier with ultraviolet light. In this utility model, the control motherboard has the characteristics of small size, multiple functions, and high integration. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0015] Figure 1 This is a schematic diagram of the internal structure of the IoT water purifier of this utility model;

[0016] Figure 2A This is a schematic diagram of the front panel of the control motherboard in the control circuit of an Internet of Things water purifier according to this utility model;

[0017] Figure 2B This is a schematic diagram of the back panel of the control motherboard in the control circuit of an Internet of Things water purifier according to this utility model;

[0018] Figure 3 This is a schematic diagram of a microcontroller in the control circuit of an Internet of Things (IoT) water purifier according to this utility model;

[0019] Figure 4 This is a schematic diagram of an IoT chip in the control circuit of an IoT water purifier according to this utility model;

[0020] Figure 5 This is a schematic diagram of the electrical connection between a microcontroller and an IoT chip in the control circuit of an IoT water purifier according to this utility model.

[0021] Figure 6 This is a schematic diagram of an antenna interface in the control circuit of an IoT water purifier according to this utility model;

[0022] Figure 7 This is a schematic diagram of an encoding display circuit in the control circuit of an Internet of Things water purifier according to this utility model;

[0023] Figure 8 This is a schematic diagram of the inlet valve control circuit in the control circuit of an Internet of Things water purifier according to the present invention;

[0024] Figure 9 This is a schematic diagram of an ultraviolet sterilization circuit in the control circuit of an Internet of Things water purifier according to this utility model;

[0025] Figure 10 This is a schematic diagram of a water pump control circuit in the control circuit of an Internet of Things water purifier according to this utility model;

[0026] Figure 11 This is a schematic diagram of a high liquid level switch interface in the control circuit of an IoT water purifier according to this utility model;

[0027] Figure 12 This is a schematic diagram of a low liquid level switch interface in the control circuit of an IoT water purifier according to this utility model;

[0028] Figure 13 This is a schematic diagram of a flow detection circuit in the control circuit of an Internet of Things water purifier according to the present invention;

[0029] Figure 14 This is a schematic diagram of the raw water TDS detection circuit in the control circuit of an IoT water purifier according to this utility model;

[0030] Figure 15 This is a schematic diagram of a pure water TDS detection circuit in the control circuit of an IoT water purifier according to this utility model;

[0031] Figure 16 This is a schematic diagram of an alarm circuit in the control circuit of an IoT water purifier according to this utility model;

[0032] Figure 17 This is a schematic diagram of the power supply circuit in the control circuit of an IoT water purifier according to this utility model. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other alternative implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] like Figure 1 As shown, Figure 1 This is a schematic diagram of the internal structure of an IoT water purifier. When the inlet valve 10 is opened, raw water (e.g., household water) enters the IoT water purifier, and the TDS value of the raw water is measured by the raw water TDS meter 20. The raw water is filtered through the filter module 30 (e.g., a reverse osmosis membrane) to form pure water, and the TDS value of the pure water is measured by the pure water TDS meter 40. The pure water is stored in the water storage container 50, and the water pump 60 can draw pure water from the water storage container 50 for the IoT water purifier to discharge. When the outlet valve 80 is opened, the pure water flows out. In addition, the IoT water purifier also uses a flow meter 70 to statistically analyze and bill the discharged pure water.

[0035] Furthermore, this utility model provides a control circuit for an IoT water purifier, which can be applied to... Figure 1 The IoT water purifier shown enables control of various electronic components inside the IoT water purifier.

[0036] Furthermore, such as Figure 2A and Figure 2B As shown, the control circuit includes a control motherboard 100, which is rectangular in shape, with a length ranging from 100 to 150 mm and a width ranging from 30 to 40 mm. In one specific embodiment, the control motherboard 100 has a length of 150 mm and a width of 35 mm, and is characterized by its small size. The control motherboard 100 has a front panel 101 and a back panel 102; Figure 2A This is a schematic diagram of the front panel 101. Figure 2B This is a schematic diagram of the back panel 102.

[0037] Furthermore, the control motherboard 10 is equipped with a microcontroller and an IoT chip, both of which are located on the back panel 102. Figure 3 The U3 chip in the diagram is a schematic of a microcontroller. Figure 4 This is a schematic diagram of an IoT chip.

[0038] Specifically, such as Figure 5 As shown, there is an asynchronous serial port connection between the microcontroller and the IoT chip. Figure 3 The first serial port read terminal P3.0 of the microcontroller is electrically connected to resistor R14 and then connected to... Figure 5 The collector and base of the first control transistor Q1 are electrically connected to the first current-limiting resistor R18 and then to a third DC power supply of +1.8V. This third DC power supply of +1.8V is drawn from... Figure 4 The power output terminal VDD_EXT of the IoT chip is output; the emitter of the first control transistor Q3 is electrically connected. Figure 4 The serial port write terminal MAIN_TXD of the IoT chip.

[0039] In this embodiment, the first serial port readout terminal P3.0 of the microcontroller can receive data from the IoT chip. When the first serial port readout terminal P3.0 of the microcontroller outputs a low level, the first control transistor Q1 is turned off, and the first serial port readout terminal P3.0 of the microcontroller stops receiving data.

[0040] Furthermore, Figure 3 The first serial port write terminal P3.1 of the microcontroller is electrically connected. Figure 5 The cathode of diode D5 is connected to the cathode, and the anode of diode D5 is connected to the cathode. Figure 4 The serial port readout terminal MAIN_RXD of the IoT chip is connected to a third DC power supply +1.8V via a pull-up resistor R7. The serial port readout terminal MAIN_RXD of the IoT chip can receive data from the microcontroller.

[0041] Furthermore, such as Figure 2B and Figure 6 As shown, in Figure 2BIn the middle, an antenna interface P1 is also provided on the left edge of the back panel 102. The antenna interface P1 is used to connect an external antenna. The first, second, and third ends of the antenna interface P1 are electrically connected to the first filter inductor L2, the second filter inductor L3, and the third filter inductor L4, respectively, which are connected to one end of the first resistor R5. The other end of the first resistor R5 is connected to... Figure 4 The antenna terminal of the IoT chip is electrically connected to GSM_ANT.

[0042] In this embodiment, the IoT water purifier can realize functions such as remote monitoring, intelligent reminders, fault warnings and cloud management through IoT technology, which significantly improves the intelligence level of the equipment and the user experience.

[0043] Furthermore, such as Figure 7 As shown, the control circuit also includes an encoding display circuit, which includes a first blue light-emitting diode VL2 and a first red light-emitting diode VL1, both disposed on the front panel 101. The positive electrode of the first blue light-emitting diode VL2 is connected to a resistor R8 and then connected to... Figure 3 The first encoding control terminal P2.1 of the microcontroller is connected to ground via the negative terminal of the first blue LED VL2; the positive terminal of the first red LED VL1 is connected to resistor R9 and then connected to... Figure 3 The second encoding control terminal P2.2 of the microcontroller is connected to ground, and the negative terminal of the first red LED VL1 is grounded. In this embodiment, when the microcontroller controls the first blue LED VL2 to emit blue light, it indicates that the IoT water purifier has been encoded; when the microcontroller controls the first red LED VL1 to emit red light, it indicates that the IoT water purifier has not been encoded.

[0044] Furthermore, such as Figure 8 As shown, the control motherboard also includes a water inlet valve circuit, which comprises a water inlet valve interface J9 and a water inlet valve control MOSFET Q6. The water inlet valve interface J9 is located at the top edge of the front panel 101 and has positive and negative terminals for electrical connection to the aforementioned components. Figure 1 The positive and negative terminals of the inlet valve 10 are connected; the positive terminal of the inlet valve interface J9 (the second pin of the inlet valve interface J9) is also electrically connected to the first DC power supply +24V. A protection diode D8 is also connected between the positive and negative terminals of the inlet valve interface J9. The negative terminal of the inlet valve interface J9 (the first pin of the inlet valve interface J9) is electrically connected to the drain of the inlet valve control field-effect transistor Q6. The source of the inlet valve control field-effect transistor Q6 is grounded, and the gate of the inlet valve control field-effect transistor Q6 is connected to the resistor R37 and then connected to the ground. Figure 3 The microcontroller's water inlet control terminal P5.1 is also electrically connected to resistors R41 and R42 and then grounded.

[0045] In this embodiment, when the microcontroller's water inlet control terminal P5.1 drives the water inlet valve control field-effect transistor Q6 to conduct, the negative terminal of the water inlet valve (the first core of the water inlet valve interface J9) is grounded, and the water inlet valve starts to work.

[0046] Furthermore, such as Figure 9 As shown, the control motherboard also includes an ultraviolet (UV) disinfection circuit for disinfecting the water storage container 50. The UV disinfection circuit includes a disinfection interface J8 and a disinfection control field-effect transistor Q5. The disinfection interface J8 is located at the top edge of the front panel 101 and has a positive and a negative terminal, which are used to electrically connect to the positive and negative terminals of the disinfection lamp, respectively. The positive terminal of the disinfection interface J8 is also electrically connected to the first DC power supply +24V. A protection diode D7 is connected between the positive and negative terminals of the disinfection interface J8. The negative terminal of the disinfection interface J8 (the first core of the disinfection interface J8) is electrically connected to the drain of the disinfection control field-effect transistor Q5. The source of the disinfection control field-effect transistor Q5 is grounded, and the gate of the disinfection control field-effect transistor Q5 is connected to a resistor R36 and then connected to... Figure 3 The disinfection control terminal P3.5 of the microcontroller is also electrically connected to resistors R45 and R46 and then grounded.

[0047] In this embodiment, when the microcontroller's disinfection control terminal P3.5 drives the disinfection control field-effect transistor Q5 to conduct, the negative terminal of the disinfection lamp (the first core of the disinfection interface J8) is grounded, and the disinfection lamp starts to work.

[0048] Furthermore, such as Figure 10 As shown, the control motherboard also includes a water pump circuit, which comprises a water pump interface J7 and a water pump control MOSFET Q8. The water pump interface J7 is located at the top edge of the front panel 101 and has positive and negative terminals for electrical connection. Figure 1 The positive and negative terminals of the medium-sized pump 60 are connected; the positive terminal of pump interface J7 (the second pin of pump interface J7) is electrically connected to the first DC power supply +24V. A protection diode D6 is also connected between the positive and negative terminals of pump interface J7. The negative terminal of pump interface J7 (the first pin of pump interface J7) is electrically connected to the drain of pump control MOSFET Q8. The source of pump control MOSFET Q8 is grounded. The gate of pump control MOSFET Q8 is connected to resistor R35 and then connected to... Figure 3 The water pump control terminal P2.7 of the microcontroller is also electrically connected to resistors R43 and R44 and then grounded.

[0049] In this embodiment, when the microcontroller's pump control terminal P2.7 drives the pump control MOSFET Q8 to conduct, the negative terminal of the pump (the first core of the pump interface J7) is grounded, and the pump starts to work.

[0050] Furthermore, such as Figure 11 and Figure 12 As shown, the control circuit also includes a high level switch interface J6 and a low level switch interface J10 located on the top edge of the front panel 101. Both the high level switch interface J6 and the low level switch interface J10 are electrically connected to the microcontroller and are used to connect the high level switch and the low level switch, respectively. The high level switch and the low level switch are located at the top and bottom of the water storage container 50, respectively, and are used to detect the high level and low level of the water storage container 50.

[0051] exist Figure 11 In the middle, the power supply terminal (the second pin of the high liquid level switch interface J6) is electrically connected to resistor R22 and then connected to... Figure 3 The power output terminal P2.0 of the microcontroller supplies power to the high liquid level switch. The signal terminal (the first pin of the high liquid level switch interface J6) is electrically connected to the high liquid level signal terminal P4.4 of the microcontroller after being connected to resistor R26. When the high liquid level switch is triggered, the signal terminal of the high liquid level switch interface J6 sends a signal to the high liquid level signal terminal P4.4 of the microcontroller.

[0052] exist Figure 12 In the circuit, the power supply terminal (the second pin of the low liquid level switch interface J10) is electrically connected to resistor R39 and then connected to the low liquid level signal terminal P2.5 of the microcontroller. The low liquid level signal terminal P2.5 of the microcontroller is also electrically connected to resistor R48 and then connected to the second DC power supply +5V. The ground terminal (the first pin of the low liquid level switch interface J10) is grounded. When the low liquid level switch is triggered, the electrical connection between resistors R39 and R48 sends a signal to the low liquid level signal terminal P2.5 of the microcontroller.

[0053] Furthermore, such as Figure 13 As shown, the control circuit also includes a flow detection circuit, which includes components for connecting... Figure 1 The flow detection interface J5 of the flow meter 70 is located at the top edge of the front panel 101. The power terminal (first pin) of the flow detection interface J5 is electrically connected to the second DC power supply +5V. The ground terminal (third pin) of the flow detection interface J5 is grounded. The signal terminal (second pin) of the flow detection interface J5 is electrically connected to the first flow detection resistor R23 and the second flow detection resistor R19, and then connected to the second DC power supply +5V. The electrical connection between the first flow detection resistor R23 and the second flow detection resistor R19 is electrically connected to... Figure 3 The flow sampling terminal P3.4 of the microcontroller.

[0054] When the IoT water purifier dispenses pure water, the flow meter can input a signal to the microcontroller through the second terminal of the flow detection interface J5 to measure the amount of water dispensed.

[0055] Furthermore, such as Figure 14 As shown, the control circuit also includes a raw water TDS detection circuit, which includes a raw water TDS interface J4 located at the top edge of the front panel 101. The raw water TDS interface J4 is used to connect... Figure 1 The raw water TDS analyzer 20 has its power supply terminal (the first pin of the raw water TDS interface J4) electrically connected to the collector of the raw water detection transistor Q2. The emitter of the raw water detection transistor Q2 is electrically connected to the second DC power supply +5V. The base of the raw water detection transistor Q2 is electrically connected to the raw water detection resistor R20 and then connected to... Figure 3 The raw water detection and control terminal P1.6 of the microcontroller; the sampling terminal of the raw water TDS interface (the second pin of the raw water TDS interface J4) is electrically connected to the first sampling voltage divider resistor R27 and then... Figure 3 The raw water detection sampling terminal P1.2 of the microcontroller is electrically connected, and the sampling terminal of the raw water TDS interface is also electrically connected to the second sampling voltage divider resistor R29 and then grounded.

[0056] When the raw water detection control terminal P1.6 of the microcontroller controls the raw water detection transistor Q2 to conduct, the raw water TDS detector starts to sample the TDS value of the raw water and transmits the sampling signal to the raw water detection sampling terminal P1.2 of the microcontroller through the sampling terminal of the raw water TDS detector (the second pin of the raw water TDS interface J4).

[0057] Furthermore, such as Figure 15 As shown, the control circuit also includes a pure water TDS detection circuit, which includes a pure water TDS interface J3 located at the top edge of the front panel 101. The pure water TDS interface J3 is used to connect... Figure 1 The pure water TDS analyzer 40 has its power supply terminal (the second pin of the pure water TDS interface J3) electrically connected to the collector of the pure water detection transistor Q3. The emitter of the pure water detection transistor Q3 is electrically connected to the second DC power supply +5V. The base of the pure water detection transistor Q3 is electrically connected to the pure water detection resistor R21 and then connected to... Figure 3 The pure water detection control terminal P4.6 of the microcontroller; the sampling terminal of the pure water TDS interface (the first pin of pure water TDS interface J3) is electrically connected to the third sampling voltage divider resistor R28 and then... Figure 3 The pure water detection sampling terminal P1.1 of the microcontroller is electrically connected, and the sampling terminal of the pure water TDS interface is also electrically connected to the fourth sampling voltage divider resistor R30 and then grounded.

[0058] When the pure water detection control terminal P4.6 of the microcontroller controls the pure water detection transistor Q3 to conduct, the pure water TDS detector starts to sample the TDS value of the pure water and transmits the sampling signal to the pure water detection sampling terminal P1.1 of the microcontroller through the sampling terminal of the pure water TDS detector (the first pin of the pure water TDS interface J3).

[0059] Furthermore, such as Figure 16 As shown, the control circuit also includes an alarm circuit, which includes a buzzer B1 located on the front panel 101. The positive terminal of buzzer B1 is connected to a resistor R32 and then to a first DC power supply of +24V. An alarm protection diode D9 is also connected between the positive and negative terminals of buzzer B1. The negative terminal of buzzer B1 is connected to the collector of alarm control transistor Q7, and the base of alarm control transistor Q7 is connected to the first alarm voltage divider resistor R42 and then to... Figure 3 The alarm control terminal P1.7 of the microcontroller is electrically connected, and the base of the alarm control transistor Q7 is also electrically connected to the second alarm voltage divider resistor R49 and then grounded.

[0060] In this embodiment, when the IoT water purifier malfunctions, the microcontroller controls the alarm circuit to issue an alarm.

[0061] Furthermore, in combination Figure 2A and Figure 17 In this embodiment, the control circuit also includes a power supply circuit, which includes a power interface J1 and a voltage conversion chip XL1509. The power interface J1 is located at the top edge of the front panel 101 and is used to introduce a first DC power supply of +24V. The voltage conversion chip XL1509 is located on the back panel 102. The input terminal IN of the voltage conversion chip XL1509 is electrically connected to the protection resistor RT1 and the protection diode D1 and then connected to the positive terminal of the power interface J1. The output terminal OUT of the voltage conversion chip XL1509 outputs a second DC power supply of +5V.

[0062] Finally, it should be noted that if any directional indication (such as up, down, left, right, front, back, etc.) is involved in the embodiments of this application, the directional indication is only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0063] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0064] The above are merely embodiments of this application and do not limit the scope of this patent application. Any equivalent structural or procedural changes made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of this application.

Claims

1. A control circuit for an Internet of Things water purifier, characterized in that, The control circuit includes a control motherboard, which is rectangular in shape and has a front panel and a back panel. The back panel is provided with a microcontroller and an IoT chip, and the microcontroller is electrically connected to the IoT chip; the left edge of the back panel is also provided with an antenna interface, the first end, the second end and the third end of the antenna interface are electrically connected to a first filter inductor, a second filter inductor, and a third filter inductor connected to one end of a first resistor, and the other end of the first resistor is electrically connected to the antenna end of the IoT chip; The control motherboard is also equipped with an ultraviolet disinfection circuit, which includes a disinfection interface and a disinfection control field-effect transistor. The disinfection interface is located at the top edge of the front panel and has a positive and a negative terminal, which are used to electrically connect to the positive and negative terminals of the disinfection lamp, respectively. The positive terminal of the disinfection interface is also electrically connected to a first DC power supply, and the negative terminal of the disinfection interface is electrically connected to the drain of the disinfection control field-effect transistor. The source of the disinfection control field-effect transistor is grounded, and the gate of the disinfection control field-effect transistor is electrically connected to the disinfection control terminal of the microcontroller.

2. The control circuit for the Internet of Things water purifier according to claim 1, characterized in that, The control circuit also includes an encoding display circuit, which includes a first blue light-emitting diode and a first red light-emitting diode, both disposed on the front panel. The positive terminal of the first blue light-emitting diode is electrically connected to the first encoding control terminal of the microcontroller, and the negative terminal of the first blue light-emitting diode is grounded. The positive terminal of the first red light-emitting diode is electrically connected to the second encoding control terminal of the microcontroller, and the negative terminal of the first red light-emitting diode is grounded.

3. The control circuit for the Internet of Things water purifier according to claim 2, characterized in that, The control circuit also includes a high-level switch interface and a low-level switch interface disposed on the top edge of the front panel. Both the high-level switch interface and the low-level switch interface are electrically connected to the microcontroller and are used to connect the high-level switch and the low-level switch, respectively.

4. The control circuit for the Internet of Things water purifier according to claim 3, characterized in that, The control circuit also includes a raw water TDS detection circuit, which includes a raw water TDS interface located at the top edge of the front panel. The raw water TDS interface is used to connect to a raw water TDS analyzer. The power supply terminal of the raw water TDS interface is electrically connected to the collector of a raw water detection transistor. The emitter of the raw water detection transistor is electrically connected to a second DC power supply. The base of the raw water detection transistor is electrically connected to a raw water detection resistor and then connected to the raw water detection control terminal of the microcontroller. The sampling terminal of the raw water TDS interface is electrically connected to a first sampling voltage divider resistor and then electrically connected to the raw water detection sampling terminal of the microcontroller. The sampling terminal of the raw water TDS interface is also electrically connected to a second sampling voltage divider resistor and then grounded.

5. The control circuit for an Internet of Things water purifier of claim 4, wherein, The control circuit also includes a pure water TDS detection circuit, which includes a pure water TDS interface located at the top edge of the front panel. The pure water TDS interface is used to connect to a pure water TDS analyzer. The power supply terminal of the pure water TDS interface is electrically connected to the collector of a pure water detection transistor. The emitter of the pure water detection transistor is electrically connected to a second DC power supply. The base of the pure water detection transistor is electrically connected to a pure water detection resistor and then connected to the pure water detection control terminal of the microcontroller. The sampling terminal of the pure water TDS interface is electrically connected to a third sampling voltage divider resistor and then electrically connected to the pure water detection sampling terminal of the microcontroller. The sampling terminal of the pure water TDS interface is also electrically connected to a fourth sampling voltage divider resistor and then grounded.

6. The control circuit for an Internet of Things water purifier of claim 5, wherein, The control circuit further includes a power supply circuit, which includes a power interface and a voltage conversion chip. The power interface is located at the top edge of the front panel and is used to introduce the first DC power supply. The voltage conversion chip is located on the back panel, with its input terminal electrically connected to the positive terminal of the power interface and its output terminal outputting the second DC power supply.

7. The control circuit for the Internet of Things water purifier according to any one of claims 1 to 6, characterized in that, The control circuit also includes an alarm circuit, which includes a buzzer installed on the front panel. The positive terminal of the buzzer is electrically connected to the first DC power supply, and the negative terminal of the buzzer is electrically connected to the collector of the alarm control transistor. The base of the alarm control transistor is electrically connected to the alarm control terminal of the microcontroller after being connected to the first alarm voltage divider resistor. The base of the alarm control transistor is also electrically connected to the ground after being connected to the second alarm voltage divider resistor.

8. The control circuit for an Internet of Things water purifier of claim 7, wherein, The control circuit also includes a flow detection circuit, which includes a flow detection interface for connecting a flow meter. The flow detection interface is located at the top edge of the front panel. The power supply terminal of the flow detection interface is electrically connected to a second DC power supply. The signal terminal of the flow detection interface is electrically connected to a first flow detection resistor and a second flow detection resistor and then connected to the second DC power supply. The electrical connection between the first flow detection resistor and the second flow detection resistor is electrically connected to the flow sampling terminal of the microcontroller.

9. The control circuit for an Internet of Things water purifier of claim 7, wherein, The control motherboard also includes a water pump circuit, which comprises a water pump interface and a water pump control field-effect transistor. The water pump interface is located at the top edge of the front panel and has a positive and a negative terminal, which are used to electrically connect to the positive and negative terminals of the water pump, respectively. The positive terminal of the water pump interface is also electrically connected to the first DC power supply, and the negative terminal of the water pump interface is electrically connected to the drain of the water pump control field-effect transistor. The source of the water pump control field-effect transistor is grounded, and the gate of the water pump control field-effect transistor is electrically connected to the water pump control terminal of the microcontroller.

10. The control circuit for an Internet of Things water purifier of claim 9, wherein, The control motherboard also includes a water inlet valve circuit, which comprises a water inlet valve interface and a water inlet valve control field-effect transistor. The water inlet valve interface is located at the top edge of the front panel and has a positive and a negative terminal, which are used to electrically connect to the positive and negative terminals of the water inlet valve, respectively. The positive terminal of the water inlet valve interface is also electrically connected to the first DC power supply, and the negative terminal of the water inlet valve interface is electrically connected to the drain of the water inlet valve control field-effect transistor. The source of the water inlet valve control field-effect transistor is grounded, and the gate of the water inlet valve control field-effect transistor is electrically connected to the water inlet control terminal of the microcontroller.

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