CN216387796U

CN216387796U - Control circuit for household water purifier

Info

Publication number: CN216387796U
Application number: CN202122634694.2U
Authority: CN
Inventors: 陈洪生
Original assignee: Zhengzhou Yuelong Electronic Technology Co ltd
Current assignee: Zhengzhou Yuelong Electronic Technology Co ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-04-26
Anticipated expiration: 2031-10-29

Abstract

The utility model discloses a control circuit for a household water purifier, which comprises a single chip microcomputer, a first water outlet control circuit and a water full induction control circuit, wherein the first water outlet control circuit comprises a first field effect tube, the drain electrode of the first field effect tube is electrically connected with the negative electrode of a water outlet valve, the positive electrode of the water outlet valve is electrically connected with a first direct current power supply, the grid electrode of the first field effect tube is electrically connected with a water outlet control resistor and then is electrically connected with the first control end of the single chip microcomputer, and the source electrode of the first field effect tube is grounded; the water full induction control circuit comprises a water full induction switch, a first end of the water full induction switch is connected with a first sampling end of the singlechip after being connected with the water full induction resistor, and a second end of the water full induction switch is grounded. The second water outlet control circuit comprises a high-voltage switch, and the signal end of the high-voltage switch is electrically connected with the second sampling end of the singlechip after being connected with the high-voltage detection resistor. The utility model realizes the effective control of the household water purifier.

Description

Control circuit for household water purifier

Technical Field

The utility model relates to the field of water purification, in particular to a control circuit for a household water purifier.

Background

In daily life, people usually use a household water purifier to filter city tap water, so that the safety of drinking water is further guaranteed. The filtered purified water (pure water) can be used for cleaning vegetables, cooking rice, burning hot water, washing kitchenware and the like. Fig. 1 and 2 illustrate a home water purifier for which a control circuit needs to be provided to ensure stable operation and efficient control thereof.

SUMMERY OF THE UTILITY MODEL

The utility model provides a control circuit for a household water purifier, which solves the problem of how to realize effective control on the household water purifier.

In order to solve the technical problems, the utility model adopts a technical scheme that a control circuit for a household water purifier is provided, and comprises a single chip microcomputer, a first water outlet control circuit and a water full induction control circuit, wherein the first water outlet control circuit comprises a first field effect tube, the drain electrode of the first field effect tube is electrically connected with the negative electrode of a water outlet valve, the positive electrode of the water outlet valve is electrically connected with a first direct current power supply, the grid electrode of the first field effect tube is electrically connected with a water outlet control resistor and then is electrically connected with the first control end of the single chip microcomputer, and the source electrode of the first field effect tube is grounded; the water full induction control circuit comprises a water full induction switch, a first end of the water full induction switch is connected with a water full induction resistor and then is connected to a first sampling end of the single chip microcomputer, and a second end of the water full induction switch is grounded.

Preferably, the water purifier further comprises a second water outlet control circuit, the second water outlet control circuit comprises a high-voltage switch, and a signal end of the high-voltage switch is electrically connected with the high-voltage detection resistor and then is connected with a second sampling end of the single chip microcomputer.

Preferably, the single chip microcomputer is further in communication connection with the internet of things chip.

Preferably, the filter element service life display circuit further comprises a first light emitting diode, the anode of the first light emitting diode is electrically connected with the first current limiting resistor and then connected to the second control end of the single chip microcomputer, and the cathode of the first light emitting diode is grounded.

Preferably, the system also comprises a water inlet valve control circuit and a booster pump control circuit, wherein the water inlet valve control circuit and the booster pump control circuit are the same as the first water outlet control circuit in composition.

Preferably, the water purifier further comprises a pure water flow detection circuit, the pure water flow detection circuit comprises a pure water flowmeter, a second direct-current power supply is electrically connected to a power end of the pure water flowmeter, a signal end of the pure water flowmeter is electrically connected with a first pure water flow detection resistor and a second pure water flow detection resistor and then is connected with the second direct-current power supply, and the electric connection position of the first pure water flow detection resistor and the second pure water flow detection resistor is electrically connected with a third sampling end of the single chip microcomputer.

Preferably, still including forming same raw water TDS detection circuitry and pure water TDS detection circuitry, wherein, raw water TDS detection circuitry includes raw water TDS sensor, the collecting electrode of raw water control triode is connected to raw water TDS sensor's power end electricity, second DC power supply is connected to the projecting pole electricity of raw water control triode, the electricity is connected behind the raw water control resistor to the base electricity of raw water control triode the third control end of singlechip, behind the first sampling divider resistance of the sampling end electricity connection of raw water TDS sensor with the fourth sampling end electricity of singlechip is connected, ground connection behind the second sampling divider resistance of the sampling end electricity connection of raw water TDS sensor still.

Preferably, the water leakage detection circuit comprises a water leakage detection sensor, a power end of the water leakage detection sensor is electrically connected with a fourth control end of the single chip microcomputer, a signal end of the water leakage detection sensor is electrically connected with the first water leakage detection resistor and then is connected to a fifth sampling end of the single chip microcomputer, and the signal end of the water leakage detection sensor is also electrically connected with the second water leakage detection resistor and then is grounded.

Preferably, still include alarm circuit, alarm circuit includes bee calling organ, first DC power supply of positive electricity connection of bee calling organ, the collecting electrode of alarm control triode is even connected to the negative pole electricity of bee calling organ, behind the base electricity connection first warning divider resistance of alarm control triode with the fifth control end electricity of singlechip is connected, ground connection behind the base electricity connection second warning divider resistance of alarm control triode still.

Preferably, the power supply circuit further comprises a chip XL1509-5V, wherein a first direct current power supply is input to an input end of the chip XL1509-5V, and a second direct current power supply is output from an output end of the chip XL 1509-5V.

The utility model has the beneficial effects that: the utility model discloses a control circuit for a household water purifier, which comprises a single chip microcomputer, a first water outlet control circuit and a water full induction control circuit, wherein the first water outlet control circuit comprises a first field effect tube, the drain electrode of the first field effect tube is electrically connected with the negative electrode of a water outlet valve, the positive electrode of the water outlet valve is electrically connected with a first direct current power supply, the grid electrode of the first field effect tube is electrically connected with a water outlet control resistor and then is electrically connected with the first control end of the single chip microcomputer, and the source electrode of the first field effect tube is grounded; the water full induction control circuit comprises a water full induction switch, a first end of the water full induction switch is connected with a first sampling end of the singlechip after being connected with the water full induction resistor, and a second end of the water full induction switch is grounded. The second water outlet control circuit comprises a high-voltage switch, and the signal end of the high-voltage switch is electrically connected with the second sampling end of the singlechip after being connected with the high-voltage detection resistor. The utility model realizes the effective control of the household water purifier.

Drawings

FIG. 1 is a schematic view of a main body of a water purifier in a household water purifier;

FIG. 2 is a schematic view showing a configuration of a waterway of the home water purifier;

FIG. 3 is a schematic configuration diagram of a control circuit for a home water purifier according to the present invention;

fig. 4 is a power supply circuit in a control circuit for a home water purifier according to the present invention;

fig. 5 is a one-chip microcomputer in a control circuit for a home water purifier according to the present invention;

fig. 6 is a chip of the internet of things in a control circuit for a household water purifier according to the present invention;

fig. 7 is a communication circuit of a chip machine and an internet of things in a control circuit for a household water purifier according to the present invention;

fig. 8 is a power-on control circuit of an internet of things chip in a control circuit for a household water purifier according to the present invention;

FIG. 9 is a first water discharge control circuit in the control circuit for a household water purifier according to the present invention;

fig. 10 is a water full sensing control circuit in a control circuit for a home water purifier according to the present invention;

FIG. 11 is a second effluent control circuit for use in the control circuit of a household water purifier in accordance with the present invention;

fig. 12 is a filter life display circuit in a control circuit for a household water purifier according to the present invention;

FIG. 13 is a pure water flow rate detecting circuit in a control circuit for a household water purifier according to the present invention;

FIG. 14 is a raw water TDS detection circuit in a control circuit for a home water purifier according to the present invention;

fig. 15 is a water leakage detecting circuit in a control circuit for a home water purifier according to the present invention;

fig. 16 is an alarm circuit in a control circuit for a home water purifier according to the present invention.

Detailed Description

In order to facilitate an understanding of the utility model, the utility model is described in more detail below with reference to the accompanying drawings and specific examples. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It is to be noted that, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In order to facilitate understanding of a control circuit for a home water purifier according to the present invention, a home water purifier to which the present invention is directed will be further described with reference to fig. 1 and 2.

In fig. 1 and 2, the household water purifier includes a water purifier body 1, the water purifier body 1 having a water inlet 2 and a water outlet 3, and a filtering device provided inside the water purifier body 1. The water inlet 2 is used for inputting a water source, which may be city tap water. The filtering device is used for filtering an input water source and outputting pure water through the water outlet 3.

As shown in figure 2, the filter device comprises a plurality of stages of filter elements, namely a PP cotton filter element 14, a granular activated carbon filter element 13, a compressed activated carbon filter element 12, a reverse osmosis membrane filter element 11 and a rear activated carbon filter element 9, wherein the multistage filter elements are connected through a water pipe.

In the utility model, raw water (input water source) is filtered by a PP cotton filter element 14, a granular activated carbon filter element 13, a compressed activated carbon filter element 12, a reverse osmosis membrane filter element 11 and a rear activated carbon filter element 9 in sequence and then pure water is output.

Referring to fig. 2, a low-pressure switch 18 is arranged on a water pipe between the PP cotton filter element 14 and the granular activated carbon filter element 13; the low-pressure switch 18 is used for detecting the water pressure of the raw water, and when the low-pressure switch 18 detects that the water pressure of the raw water is lower than a set value for one minute, the domestic water purifier is indicated to be in a water shortage state, namely no water source is input into the domestic water purifier.

Be provided with raw water TDS sensor 17 on the water pipe between granule activated carbon filter 13 and the compression activated carbon filter 12, raw water TDS sensor 17 is used for detecting the TDS value of raw water.

A water inlet valve 15 and a booster pump 16 are arranged on a water pipe between the compressed activated carbon filter element 12 and the reverse osmosis membrane filter element 11.

The export of reverse osmosis membrane filter core 11 includes waste water outlet and pure water outlet, and the waste water outlet intercommunication drain line 191 of reverse osmosis membrane filter core 11, the pure water outlet of reverse osmosis membrane filter core 11 and the input port connection of rearmounted active carbon filter core 9.

The drain line 191 is provided with a flush valve 19, when the reverse osmosis membrane filter element 11 needs to be flushed, the water inlet valve 15 is opened, the booster pump 16 works, the flush valve 19 is opened to flush the reverse osmosis membrane filter element 11, and the output end of the drain line 191 serves as a wastewater interface 101 of the water purifier main body 1 in fig. 1.

Preferably, a pure water flow meter 10 is arranged on a water pipe between the pure water outlet of the reverse osmosis membrane filter element 11 and the rear activated carbon filter element 9, and the pure water flow meter 10 is used for measuring the flow rate of pure water.

Preferably, the output end of the rear activated carbon filter element 9 is connected to the input end of the pure water output pipeline 91, the output end of the pure water output pipeline 91 is connected to the input end of the three-way connector 21, the first output end of the three-way connector 21 is connected to the first water outlet pipeline 51, and the output end of the first water outlet pipeline 51 is used as the first water outlet 31. The second output end of the three-way connector 21 is connected to a second water outlet pipeline 52, and the output end of the second water outlet pipeline 52 is used as the second water outlet 32.

Preferably, a pure water TDS sensor 8 is provided on the pure water output pipeline 91, and the pure water TDS sensor 8 is used for detecting a TDS value of pure water.

Preferably, the first water outlet pipe 51 is provided with a water outlet valve 5, and the water outlet valve 5 can open or close the outflow of pure water from the first water outlet pipe 51.

Preferably, the second outlet line 52 is provided with a high pressure switch 7, and the high pressure switch 7 is capable of detecting the water pressure in the second outlet line 52.

Further, the water outlet 3 includes a first water outlet 31 and a second water outlet 32, and the first water outlet 31 is connected to the water storage device 4 through a water injection pipe 51. The second water outlet 32 is connected with a water outlet switch 6 through a water pipe, when the water outlet switch 6 is opened, the high-pressure switch 7 is closed, and pure water can flow out from the second water outlet pipeline 52; when the water outlet switch 6 is closed, the high-pressure switch 7 is turned off, and pure water cannot flow out from the second water outlet pipeline 52.

In the utility model, the water purifier body 1 can inject pure water into the water storage device 4, so that a part of pure water is reserved in the water storage device 4, and the water purifier is convenient for people to use or reserve directly. The water outlet switch 6 may be a water tap, such as a gooseneck water tap. After the gooseneck faucet is opened, pure water flowing out of the gooseneck faucet can be used for a user to clean vegetables or kitchen ware and the like. The user can use the pure water by turning on the water outlet switch 6, or can directly use the pure water in the water storage device 4. Normally, the pure water in the water storage device 4 can be directly poured into a pot in the user's home, and the user does not need to place the pot under the water outlet switch 6 to receive water. This mode convenience of customers gets water, and the pure water in the water storage device 4 and the pure water that goes out water switch 6 outflow can use simultaneously or exclusive use, have also improved the efficiency of user's water intaking.

When the water purifier body 1 injects water into the water storage device 4, the liquid level of the water storage device 4 gradually rises along with the increase of the water injection amount, and as a water full induction switch (such as a float switch) is arranged in the water storage device 4, when the water storage device 4 is full of water, the water storage device 4 transmits a switching signal generated by the water full induction switch to the water purifier body 1, which indicates that the water storage kettle 42 is full of pure water, and the water purifier body 1 stops injecting water into the water storage device 4; after the user has used up the pure water in the water storage 4, the water purifier body 1 can be refilled into the water storage 4.

As shown in fig. 3, the control circuit for the household water purifier includes a single chip 201, a first effluent control circuit 202, and a water full sensing control circuit 203.

The first outlet control circuit 202 is used to control the opening and closing of the outlet valve 5 in fig. 2.

The water level sensing control circuit 203 detects whether the water storage device 4 of fig. 2 is full.

The second water outlet control circuit 204 is electrically connected with the high-voltage switch 7 in fig. 2.

The cartridge life display circuit 205 is used to display the life of the cartridge of fig. 2.

The inlet valve control circuit 206 is used to control the opening and closing of the inlet valve 15 in fig. 2.

The booster pump control circuit 207 controls opening and closing of the booster pump 16 in fig. 2.

The pure water flow rate detection circuit 208 is electrically connected to the pure water flow meter 10 in fig. 2.

The raw water TDS detection circuit 209 and the pure water TDS detection circuit 210 are electrically connected to the raw water TDS sensor 17 and the pure water TDS sensor 8 in fig. 2, respectively.

The water leakage detection circuit 211 is used for detecting whether the water leakage phenomenon exists in the household water purifier.

The single chip microcomputer 201 is also electrically connected with the Internet of things chip 212, network connection of the household water purifier is achieved, a cloud intelligent control system is grafted, and a user is supported to check the whole machine state, the water quality condition and the service life of a filter element of the household water purifier in real time through WeChat; equipment defaulting and filter element life expiration can be provided to the user with little confidence.

The power supply circuit also comprises a power supply circuit, as shown IN FIG. 4, the power supply circuit comprises a chip XL1509-5V, the input end IN of the chip XL1509-5V inputs a first direct current power supply +24V, and the output end OUT outputs a second direct current power supply + 5V.

Specifically, an input end IN of a chip XL1509-5V is electrically connected with a thermistor RT1 and then is connected to the cathode of a power input protection diode D1, and the anode of the power input protection diode D1 is electrically connected with a first direct-current power supply + 24V; the input end IN of the chip XL1509-5V is also electrically connected with a polarity capacitor C1 and a capacitor C2 and then grounded.

An output end OUT of the chip XL1509-5V is electrically connected with an inductor L1 and then connected with one end of a protection resistor F1, the other end of the protection resistor F1 outputs a second direct current power supply +5V, and the second direct current power supply +5V is also electrically connected with a capacitor C5 and a capacitor C6 respectively and then grounded.

Preferably, the inductor L1 is further electrically connected to the first diode D2 and the second diode D4 to output the wireless communication power supply VCC _ GPRS. It can be seen that, the two independent power supply branches used herein respectively supply power to the single chip microcomputer and the internet of things chip, and the function is to avoid mutual power supply interference, because the power supply of the internet of things chip has the phenomenon of instantaneous large current, that is, when the internet of things chip sends a wireless signal to the outside, the phenomenon of obvious instantaneous large current can be generated, which causes instability of power supply voltage, but because of the reverse blocking effect of the second diode D4, the influence on the first dc power supply +5V output by the single chip microcomputer is not caused.

Preferably, the output terminal OUT of the chip XL1509-5V is electrically connected with the power output protection diode D5 and then grounded, the electrical connection part of the inductor L1 and the protection resistor F1 is electrically connected with the feedback terminal FB of the chip XL1509-5V, and the electrical connection part of the inductor L1 and the protection resistor F1 is electrically connected with the polarity capacitor C7, the polarity capacitor C8 and the capacitor C3 and then grounded.

FIG. 5 is a schematic diagram of a single chip microcomputer, wherein the single chip microcomputer is powered by +5V through a second direct current power supply. Fig. 6 is a schematic diagram of an internet of things chip, and the internet of things chip is further electrically connected with a SIM card.

Preferably, as shown in fig. 7. The communication interconnection between the single chip microcomputer and the chip of the Internet of things is asynchronous serial port communication connection. In fig. 6, the power supply output terminal VDD _ EXT of the internet of things chip outputs +1.8V of the third dc power supply.

A first serial port reading end P3.0 of the chip microcomputer in fig. 5 is electrically connected to a collector of the first control triode Q1, a base of the first control triode Q1 is electrically connected to the second current-limiting resistor R17 and then connected to the third dc power supply of +1.8V, and an emitter of the first control triode Q1 is electrically connected to a serial port writing end MAIN _ TXD of the chip of the internet of things in fig. 6.

Preferably, the first serial port reading end P3.0 of the single chip microcomputer is electrically connected with the first pull-up resistor R13 and then connected with the second direct current power supply + 5V.

The first serial port reading end P3.0 of the single chip microcomputer can receive data from the internet of things chip, but when the first serial port reading end P3.0 of the single chip microcomputer outputs a low level, the first control triode Q1 is turned off, and the first serial port reading end P3.0 of the single chip microcomputer stops receiving data in fig. 5.

Preferably, a first serial port write terminal P3.1 of the chip microcomputer in fig. 5 is electrically connected to an emitter of the second control triode Q4, a base of the second control triode Q4 is electrically connected to the third current limiting resistor, then R12 is connected to the third dc power supply +1.8V, and a collector of the second control triode Q4 is electrically connected to a serial port read-out terminal MAIN _ RXD of the internet of things chip in fig. 6.

Preferably, the serial port readout end MAIN _ RXD of the internet of things chip is further electrically connected with the second pull-up resistor R14 and then connected with the third direct current power supply by + 1.8V.

The serial port reading end MAIN _ RXD of the Internet of things chip can receive data from the single chip microcomputer, when the serial port reading end MAIN _ RXD of the Internet of things chip outputs a low level, the second control triode Q4 is cut off, and the serial port reading end MAIN _ RXD of the Internet of things chip stops receiving the data.

Preferably, as shown in fig. 8. The wireless communication power supply VCC _ GPRS is not directly electrically connected with the power supply end VBAT of the chip of the internet of things, but the wireless communication power supply VCC _ GPRS is electrically connected with the source electrode of an MOS tube Q5 for power supply control, the grid electrode of the MOS tube Q5 is electrically connected with one end of a reset control current-limiting resistor R39, the other end of the reset control current-limiting resistor R39 is used as a power supply reset control end and is electrically connected with an input/output pin P1.5 of the single chip microcomputer in the figure 5, a pull-up resistor R37 and a pull-up resistor R38 are connected between the power supply reset control end and the wireless communication power supply VCC _ GPRS in parallel, and the drain electrode of the MOS tube Q5 is used as a controlled end of the wireless communication power supply VCC _ GPRS and is connected with the power supply end VBAT of the chip of the internet of things in the figure 6.

When normal work, single chip microcomputer control MOS pipe Q5 switches on, wireless communication power supply VCC _ GPRS can supply power for the thing networking chip like this, and after single chip microcomputer control MOS pipe Q5 cut off, the power supply is then cut off to the thing networking chip, then switch on by single chip microcomputer control MOS pipe Q5 once more, realize the power supply to the thing networking chip, just so can realize power-on control again to the thing networking chip, realized the restart operation to the thing networking chip, ensured the reliability that the thing networking chip used.

As shown in fig. 9, the first effluent control circuit includes a first field-effect transistor Q10, a drain of the first field-effect transistor Q10 is electrically connected to a negative electrode (a first end of a junction J5) of the effluent valve, a positive electrode (a second end of the junction J5) of the effluent valve is electrically connected to a first dc power supply +24V, a gate of the first field-effect transistor Q10 is electrically connected to an effluent control resistor R44 and then electrically connected to a first control end P0.7 of the chip microcomputer in fig. 5, and a source of the first field-effect transistor Q10 is grounded; when the first control end P0.7 of the single chip drives the first field effect transistor Q10 to be conducted, the negative electrode of the water outlet valve (the first end of the interface J5) is grounded, and the water outlet valve is opened.

The first control terminal P0.7 of the singlechip in FIG. 5 is also electrically connected with the resistor R47 and the resistor R48 respectively and then grounded; the drain of the first field effect transistor Q10 is electrically connected to the anode of the protection diode D13, and the cathode of the protection diode D13 is connected to the first dc power supply + 24V. A capacitor C20 is also connected in series between the anode and the cathode of the protection diode D13.

Preferably, the water inlet valve control circuit and the booster pump control circuit are the same as the first water outlet control circuit in composition, and are not described in detail herein.

As shown in fig. 10, the water full sensing switch is electrically connected through a J6 interface, the water full sensing control circuit includes the water full sensing switch, a first end (a second end of the J6 interface) of the water full sensing switch is connected to a water full sensing resistor R24 and then connected to a first sampling end P2.4 of the single chip microcomputer in fig. 5, the first sampling end P2.4 of the single chip microcomputer is also connected to a capacitor C17 and then grounded, and a second end (a first end of the J6 interface) of the water full sensing switch is grounded.

When the water fullness sensing switch is switched from the closed state to the open state or from the open state to the closed state, the switching of the states can be recognized by the singlechip, whether the water storage device 4 in fig. 2 is full or not can be recognized through the switching of the states, and if the water storage device 4 is full, the water injection into the water storage device 4 is stopped.

As shown in fig. 11, the high-voltage switch is electrically connected through the interface J1, the second effluent control circuit includes the high-voltage switch, and a signal terminal (a second terminal of the interface J1) of the high-voltage switch is electrically connected to the high-voltage detection resistor R34 and then connected to the second sampling terminal P0.4 of the chip microcomputer in fig. 5. The second sampling end P0.4 of the single chip microcomputer is also connected with the capacitor C14 and then grounded, and the grounding end (the first end of the interface J1) of the high-voltage switch is grounded.

As shown in fig. 12, the filter element life display circuit includes a first light emitting diode VL4, a positive electrode of the first light emitting diode VL4 is electrically connected to a first current limiting resistor R9 and then connected to a second control terminal P1.6 of the chip microcomputer in fig. 5, and a negative electrode of the first light emitting diode VL4 is grounded. The first light-emitting diode VL4 can be controlled to emit light for display through the second control end P1.6 of the single chip microcomputer. In the water purifier, the filter element has a certain service life and needs to be replaced regularly, when the first light-emitting diode VL4 emits light, the service life of the filter element is not exhausted, when the first light-emitting diode VL4 does not emit light, the service life of the filter element is exhausted and needs to be replaced, and at the moment, the household water purifier can send information to a user to remind the user to replace the filter element in time.

Preferably, the filter element life display circuit may include a first filter element life display circuit to a fifth filter element life display circuit with the same circuit composition, which respectively correspond to the life of the PP cotton filter element 14, the granular activated carbon filter element 13, the compressed activated carbon filter element 12, the reverse osmosis membrane filter element 11, and the rear activated carbon filter element 9 in fig. 2.

As shown in fig. 13, the pure water flow meter is electrically connected through a connector J4, the pure water flow detection circuit includes the pure water flow meter, a power supply terminal (a first terminal of a connector J4) of the pure water flow meter is electrically connected with +5V of the second direct current power supply, a ground terminal (a first terminal of a connector J4) is connected with ground, a signal terminal (a second terminal of a connector J4) is electrically connected with the first pure water flow detection resistor R22 and the second pure water flow detection resistor R20 and then connected with +5V of the second direct current power supply, and an electrical connection part of the first pure water flow detection resistor R22 and the second pure water flow detection resistor R20 is electrically connected with a third sampling terminal P3.3 of the single chip microcomputer in fig. 5. The electric connection part of the first pure water flow detection resistor R22 and the second pure water flow detection resistor R20 is also electrically connected with the capacitor C13 and then grounded.

When the pure water flows, the pure water flow meter can input signals to the single chip microcomputer through the signal end (the second end of the interface J4) to measure the water quantity of the pure water.

The raw water TDS detection circuit and the pure water TDS detection circuit have the same composition, wherein as shown in fig. 14, the raw water TDS sensor is electrically connected through an interface J3; the raw water TDS detection circuit comprises a raw water TDS sensor, wherein a power supply end (a first end of an interface J3) of the raw water TDS sensor is electrically connected with a collector electrode of a raw water control triode Q2, an emitter electrode of the raw water control triode Q2 is electrically connected with a +5V second direct-current power supply, a base electrode of the raw water control triode Q2 is electrically connected with a third control end P2.2 of a singlechip in fig. 5 after being electrically connected with a raw water control resistor R18, a sampling end (a second end of an interface J3) of the raw water TDS sensor is electrically connected with a first sampling voltage-dividing resistor R25 and then is electrically connected with a fourth sampling end P0.1 of the singlechip in fig. 5, and the sampling end (a second end of the interface J3) of the raw water TDS sensor is also electrically connected with a second sampling voltage-dividing resistor R29 and then is grounded.

When the single chip microcomputer controls the raw water control triode Q2 to be conducted, the raw water TDS sensor starts to sample the TDS value of raw water, and a sampling end of the raw water TDS sensor transmits a sampled signal to the single chip microcomputer.

As shown in fig. 15, the water leakage detection sensor is electrically connected through a connector J7, the water leakage detection circuit includes the water leakage detection sensor, a power end (a second end of the connector J7) of the water leakage detection sensor is electrically connected to a fourth control end P2.1 of the single chip microcomputer in fig. 5, and a water leakage detection control resistor R14 is further connected between the power end of the water leakage detection sensor and the fourth control end P2.1 of the single chip microcomputer; the fourth control end P2.1 of the singlechip supplies power to the water leakage detection sensor;

the signal terminal (the second terminal of the interface J7) of the water leakage detection sensor is electrically connected to the first water leakage detection resistor R21 and then connected to the fifth sampling terminal P2.0 of the chip microcomputer in fig. 5, and the signal terminal (the second terminal of the interface J7) of the water leakage detection sensor is also electrically connected to the second water leakage detection resistor R27 and then grounded. When the water leakage detection sensor detects that the household water purifier has water leakage, a signal is sent to the singlechip through a signal end (a second end of the interface J7).

As shown in fig. 16, the alarm circuit includes a buzzer B1, the positive electrode of the buzzer B1 is electrically connected to the first dc power supply +24V, and a resistor R36 is also connected in series between the positive electrode of the buzzer B1 and the first dc power supply + 24V; the negative electrode of the buzzer B1 is electrically connected with the collector of the alarm control triode Q6, the base of the alarm control triode Q6 is electrically connected with the first alarm divider resistor R42 and then electrically connected with the fifth control end P5.4 of the singlechip in figure 5, and the base of the alarm control triode Q6 is also electrically connected with the second alarm divider resistor R49 and then grounded. When the household water purifier is abnormal, the singlechip controls the alarm control triode Q6 to be conducted, and the buzzer B1 starts alarm prompt.

Preferably, an alarm protection diode D14 is further connected between the positive electrode and the negative electrode of the buzzer B1.

Therefore, the utility model discloses a control circuit for a household water purifier, which comprises a single chip microcomputer, a first water outlet control circuit and a water full induction control circuit, wherein the first water outlet control circuit comprises a first field effect tube, the drain electrode of the first field effect tube is electrically connected with the negative electrode of a water outlet valve, the positive electrode of the water outlet valve is electrically connected with a first direct current power supply, the grid electrode of the first field effect tube is electrically connected with a water outlet control resistor and then is electrically connected with the first control end of the single chip microcomputer, and the source electrode of the first field effect tube is grounded; the water full induction control circuit comprises a water full induction switch, a first end of the water full induction switch is connected with a first sampling end of the singlechip after being connected with the water full induction resistor, and a second end of the water full induction switch is grounded. The second water outlet control circuit comprises a high-voltage switch, and the signal end of the high-voltage switch is electrically connected with the second sampling end of the singlechip after being connected with the high-voltage detection resistor. The utility model realizes the effective control of the household water purifier.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.

Claims

1. A control circuit for a household water purifier, characterized by: the water-saving control device comprises a single chip microcomputer, a first water outlet control circuit and a water full induction control circuit, wherein the first water outlet control circuit comprises a first field effect tube, the drain electrode of the first field effect tube is electrically connected with the negative electrode of a water outlet valve, the positive electrode of the water outlet valve is electrically connected with a first direct current power supply, the grid electrode of the first field effect tube is electrically connected with a water outlet control resistor and then is electrically connected with the first control end of the single chip microcomputer, and the source electrode of the first field effect tube is grounded; the water full induction control circuit comprises a water full induction switch, a first end of the water full induction switch is connected with a water full induction resistor and then is connected to a first sampling end of the single chip microcomputer, and a second end of the water full induction switch is grounded.

2. The control circuit for a home water purifier as claimed in claim 1, wherein: the water outlet control circuit comprises a high-voltage switch, and a signal end of the high-voltage switch is electrically connected with the high-voltage detection resistor and then connected with a second sampling end of the single chip microcomputer.

3. The control circuit for a home water purifier according to claim 2, wherein: the single chip microcomputer is also in communication connection with the Internet of things chip.

4. The control circuit for a home water purifier according to claim 3, wherein: the filter element service life display circuit comprises a first light-emitting diode, the positive electrode of the first light-emitting diode is electrically connected with the first current-limiting resistor and then connected to the second control end of the single chip microcomputer, and the negative electrode of the first light-emitting diode is grounded.

5. The control circuit for a home water purifier according to claim 4, wherein: the water inlet valve control circuit and the booster pump control circuit are the same as the first water outlet control circuit in composition.

6. The control circuit for a home water purifier as claimed in claim 5, wherein: still include pure water flow detection circuitry, pure water flow detection circuitry includes the pure water flowmeter, second DC power supply is connected to the power end electricity of pure water flowmeter, inserts second DC power supply behind first pure water flow detection resistance of signal end electric connection and the second pure water flow detection resistance, the electric junction electricity of first pure water flow detection resistance and second pure water flow detection resistance is connected the third sample terminal of singlechip.

7. The control circuit for a home water purifier as claimed in claim 6, wherein: still including forming same raw water TDS detection circuitry and pure water TDS detection circuitry, wherein, raw water TDS detection circuitry includes the raw water TDS sensor, the collecting electrode of raw water control triode is connected to the power end electricity of raw water TDS sensor, second DC power supply is connected to the projecting pole electricity of raw water control triode, the electricity is connected behind the raw water control resistor to the base electricity of raw water control triode the third control end of singlechip, behind the first sampling divider resistance of sampling end electricity connection of raw water TDS sensor with the fourth sampling end electricity of singlechip is connected, ground connection behind the second sampling divider resistance is connected to the sampling end electricity of raw water TDS sensor still.

8. The control circuit for a household water purifier according to any one of claims 1 to 7, wherein: the water leakage detection circuit comprises a water leakage detection sensor, a power end of the water leakage detection sensor is electrically connected with a fourth control end of the single chip microcomputer, a signal end of the water leakage detection sensor is electrically connected with a first water leakage detection resistor and then is connected into a fifth sampling end of the single chip microcomputer, and a signal end of the water leakage detection sensor is electrically connected with a second water leakage detection resistor and then is grounded.

9. The control circuit for a home water purifier as claimed in claim 8, wherein: still include alarm circuit, alarm circuit includes bee calling organ, first DC power supply is connected to bee calling organ's anodal electricity, bee calling organ's negative pole electricity connect the collecting electrode of alarm control triode, behind the base electricity of alarm control triode connect first warning bleeder resistor with the fifth control end electricity of singlechip is connected, ground connection behind the base of alarm control triode still electricity connection second warning bleeder resistor.

10. The control circuit for a home water purifier as claimed in claim 9, wherein: still include power supply circuit, power supply circuit includes chip XL1509-5V, first DC power supply is input to chip XL 1509-5V's input, and output second DC power supply.