CN219479835U - Control circuit for water dispenser - Google Patents

Abstract

The utility model discloses a control circuit for a water dispenser, which comprises a singlechip and a water leakage detection circuit, 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 water leakage detection control end of the singlechip, a signal end of the water leakage detection sensor is electrically connected with a first water leakage detection resistor and then is connected with a water leakage detection sampling end of the singlechip, and a signal end of the water leakage detection sensor is also electrically connected with a second water leakage detection resistor and then is grounded. When the water leakage detection sensor detects that the water dispenser leaks water, the signal end sends a signal to the water leakage detection sampling end of the singlechip, and the water dispenser can effectively detect whether the water dispenser leaks water or not.

Description

Control circuit for water dispenser

Technical Field

The utility model relates to the field of water dispensers, in particular to a control circuit for a water dispenser.

Background

The water dispenser is a device for heating or cooling barreled purified water (or mineral water) and bringing convenience to people for drinking. And the barreled water is placed above the machine and is matched with the barreled water for use. Or a device for filtering tap water into purified water convenient for human body to drink.

In some cases, the water dispenser may leak water, such as overflow caused by broken water bottle of the water bucket; the service life of the water dispenser is longer, and the internal pipeline is corroded, so that overflow can occur, and the water dispenser needs to be detected to remind a user of maintenance and replacement aiming at the water leakage phenomenon of the water dispenser.

Fig. 1 shows a schematic diagram of an internal waterway structure of a water dispenser, and an internet of things control circuit for the water dispenser is provided for the water dispenser to facilitate a user to know whether a book is leaked from the water dispenser and to realize various controls of the water dispenser.

Disclosure of Invention

The utility model provides a control circuit of a water dispenser, which solves the problem of how to detect whether the water dispenser has water leakage or not.

In order to solve the technical problems, the utility model adopts a technical scheme that the control circuit for the water dispenser comprises a singlechip and a water leakage detection circuit, 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 water leakage detection control end of the singlechip, a signal end of the water leakage detection sensor is electrically connected with a first water leakage detection resistor and then is connected with a water leakage detection sampling end of the singlechip, and a signal end of the water leakage detection sensor is also electrically connected with a second water leakage detection resistor and then is grounded.

Preferably, the alarm circuit further comprises an alarm circuit, the positive electrode of the alarm circuit comprises a buzzer, the positive electrode of the buzzer is electrically connected with a first direct current power supply, the negative electrode of the buzzer is electrically connected with the collector electrode of an alarm control triode, the base electrode of the alarm control triode is electrically connected with the first alarm voltage dividing resistor and then is electrically connected with the alarm control end of the singlechip, and the base electrode of the alarm control triode is electrically connected with the second alarm voltage dividing resistor and then is grounded.

Preferably, the filter element life display circuit further comprises a filter element life display diode, wherein the anode of the filter element life display diode is electrically connected with the current limiting resistor and then connected with the filter element life display control end of the singlechip, and the cathode of the filter element life display diode is grounded.

Preferably, the system further comprises a water inlet valve control circuit, wherein the water inlet valve control circuit comprises a water inlet valve control field effect tube, the drain electrode of the water inlet valve control field effect tube is electrically connected with the negative electrode of the water inlet valve, the positive electrode of the water inlet valve is electrically connected with a first direct current power supply, the grid electrode of the water inlet valve control field effect tube is electrically connected with a water inlet valve control resistor and then is electrically connected with the water inlet valve control end of the singlechip, and the source electrode of the water inlet valve control field effect tube is grounded.

Preferably, the water inlet valve control device further comprises a booster pump control circuit, a flushing valve control circuit and a water outlet valve control circuit, wherein the booster pump control circuit, the flushing valve control circuit and the water outlet valve control circuit are identical to the water inlet valve control circuit in circuit composition.

Preferably, the device further comprises a raw water TDS detection circuit and a pure water TDS detection circuit, wherein the raw water TDS detection circuit and the pure water TDS detection circuit have the same composition, the raw water TDS detection circuit comprises a raw water TDS sensor, a power end of the raw water TDS sensor is electrically connected with a collector of the raw water detection triode, an emitter of the raw water detection triode is electrically connected with a second direct current power supply, and a base of the raw water detection triode is electrically connected with a raw water detection resistor and then is connected with a raw water detection control end of the singlechip; the sampling end of the raw water TDS sensor is electrically connected with the first sampling voltage dividing resistor and then is electrically connected with the raw water detection sampling end of the singlechip, and the sampling end of the raw water TDS sensor is also electrically connected with the second sampling voltage dividing resistor and then is grounded.

Preferably, the flow detection circuit further comprises a flow meter, a power end of the flow meter is electrically connected with a second direct current power supply, a signal end of the flow meter is electrically connected with a first flow detection resistor and a second flow detection resistor and then connected with the second direct current power supply, and an electric connection part of the first flow detection resistor and the second flow detection resistor is electrically connected with a flow sampling end of the singlechip.

Preferably, the single chip microcomputer is also electrically connected with the high-voltage switch and the low-voltage switch.

Preferably, the power supply circuit further comprises a power supply circuit, the power supply circuit comprises a chip XL1509-5V, the input end of the chip XL1509-5V is input with a first direct current power supply, and the output end of the chip XL1509-5V is output with a second direct current power supply.

Preferably, the system further comprises an internet of things module electrically connected with the singlechip, wherein the internet of things module comprises a chip EC800N and a SIM card, the chip EC800N is electrically connected with the SIM card, and the singlechip is connected with an asynchronous serial port between the chip EC 800N.

The beneficial effects of the utility model are as follows: the utility model discloses a control circuit for a water dispenser, which comprises a singlechip and a water leakage detection circuit, 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 water leakage detection control end of the singlechip, a signal end of the water leakage detection sensor is electrically connected with a first water leakage detection resistor and then is connected with a water leakage detection sampling end of the singlechip, and a signal end of the water leakage detection sensor is also electrically connected with a second water leakage detection resistor and then is grounded. When the water leakage detection sensor detects that the water dispenser leaks water, the signal end sends a signal to the water leakage detection sampling end of the singlechip, and the water dispenser can effectively detect whether the water dispenser leaks water or not.

Drawings

FIG. 1 is a schematic view of an internal waterway structure of a water dispenser;

FIG. 2 is a schematic diagram of a singlechip in a control circuit of a water dispenser according to the utility model;

FIG. 3 is a water leakage detection circuit in a control circuit of a water dispenser according to the present utility model;

FIG. 4 is an alarm circuit in a control circuit of a water dispenser according to the present utility model;

FIG. 5 is a cartridge life display circuit in a control circuit of a water dispenser according to the present utility model;

FIG. 6 is a water inlet valve control circuit in a control circuit of a water dispenser according to the present utility model;

FIG. 7 is a raw water TDS detection circuit in a control circuit of a water dispenser according to the present utility model;

FIG. 8 is a flow sensing circuit in a control circuit of a water dispenser according to the present utility model;

FIG. 9 is a schematic diagram of the connection of a single-chip microcomputer with a high-voltage switch and a low-voltage switch in a control circuit of a water dispenser according to the utility model;

FIG. 10 is a power circuit in a control circuit of a water dispenser according to the present utility model;

FIG. 11 is a chip EC800N in a control circuit of a water dispenser according to the present utility model;

FIG. 12 is a SIM card stand in a control circuit of a water dispenser according to the utility model;

FIG. 13 is a communication circuit between a singlechip and a chip EC800N in a control circuit of a water dispenser according to the utility model;

FIG. 14 is another communication circuit between a singlechip microcomputer and a chip EC800N in a control circuit of a water dispenser according to the utility model;

fig. 15 is a power-on control circuit between a singlechip and a chip EC800N in a control circuit of a water dispenser according to the present utility model.

Detailed Description

In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. Preferred embodiments of the present utility model are shown in the drawings. This utility model 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.

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 utility model 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. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, a filtering device is arranged in the water dispenser of fig. 1, the filtering device comprises a PAC cotton filter element 1 and a reverse osmosis membrane filter element 5, and the PAC cotton filter element 1 and the reverse osmosis membrane filter element 5 are connected through a water pipe; raw water (input water source can be city tap water) is filtered by the PAC cotton filter element 1 and the reverse osmosis membrane filter element 5 in sequence, and then purified water is output.

A low-pressure switch 2, a raw water TDS sensor 3, a water inlet valve 4 and a booster pump 12 are arranged on a water pipe between the PAC cotton filter element 1 and the reverse osmosis membrane filter element 5. The low-voltage switch 2 is used for detecting the water pressure of the raw water, and when the low-voltage switch 2 detects that the water pressure of the raw water is lower than a set value, the water dispenser is indicated to enter a water shortage state; the raw water TDS sensor 3 is for detecting a TDS value of raw water; after the water inlet valve 4 is opened, the raw water filtered by the PAC cotton filter element 1 can pass through the reverse osmosis membrane filter element 5. The booster pump 12 is used to boost the water pressure.

The export of reverse osmosis membrane filter core 5 includes waste water export and water purification export, and the waste water export of reverse osmosis membrane filter core 5 passes through drain pipe and connects flushometer 6, when needs are washed reverse osmosis membrane filter core 6, and water intaking valve 4 is opened, booster pump 12 is opened, flushometer 6 is opened, washes reverse osmosis membrane filter core 5.

The clean water outlet of the reverse osmosis membrane filter element 5 is connected with a clean water TDS sensor 7 through a water pipe, and the clean water TDS sensor 7 is used for detecting the TDS value of clean water. The purified water TDS sensor 7 is also connected with a flowmeter 8 through a water pipe, and the flowmeter 8 is used for measuring the flow of purified water.

The flowmeter 8 is also connected with the water outlet valve 9 through a water pipe, the water outlet valve 9 is also connected with the high-pressure switch 10 and the water tap 11 through a water pipe, the high-pressure switch 10 is automatically opened after the water tap 11 is opened (the water pressure is reduced), and is automatically closed after the water tap 11 is closed (the water pressure is increased). When the water dispenser of the utility model discharges purified water, the water faucet 11 and the high-voltage switch 10 are required to be opened automatically, and the water outlet valve 9 is controlled to be opened.

In the present utility model, the control circuit for the water dispenser is capable of detecting the opening or closing of the low pressure switch 2 in fig. 1, detecting the TDS value of raw water, controlling the opening and closing of the water inlet valve 4, controlling the opening and closing of the rinse valve 6, detecting the TDS value of purified water, counting the flow rate of the water purifier, controlling the opening and closing of the water outlet valve 9, and detecting the opening or closing of the low pressure switch 2.

Meanwhile, the intelligent control system for detecting whether the water dispenser leaks or not and the grafted cloud end intelligent control system are provided, so that a user can check the complete machine state, the water quality condition, the service life of the filter element and the like of the water dispenser in real time through mobile equipment.

Specifically, as shown in fig. 2 and 3, a control circuit for the water dispenser comprises a singlechip and a water leakage detection circuit, and fig. 2 is a schematic diagram of the singlechip; in fig. 3, the water leakage detection circuit is electrically connected to the water leakage detection sensor through an interface J7. The water leakage detection circuit comprises a water leakage detection sensor, a power end (a second end of an interface J7) of the water leakage detection sensor is electrically connected with a water leakage detection control end P21 of the singlechip in the figure 2, the water leakage detection control end P21 of the singlechip supplies power to the water leakage detection sensor, and a resistor R30 is connected in series between the water leakage detection control end P21 of the singlechip and the power end (the second end of the interface J7) of the water leakage detection sensor;

the signal end (the first end of the interface J7) of the water leakage detection sensor is electrically connected with the first water leakage detection resistor R33 and then connected with the water leakage detection sampling end P22 of the singlechip in FIG. 2, and the signal end (the first end of the interface J7) of the water leakage detection sensor is also electrically connected with the second water leakage detection resistor R40 and then grounded.

When the water leakage detection sensor detects that the water dispenser leaks water, a signal is sent to a water leakage detection sampling end P22 of the singlechip through a signal end (a first end of an interface J7).

Further, as shown in fig. 5, the control circuit for the water dispenser further comprises an alarm circuit, the alarm circuit comprises a buzzer B1, the positive electrode of the buzzer B1 is electrically connected with a first direct current power supply +24v, and a resistor R27 is further connected in series between the positive electrode of the buzzer B1 and the first direct current power supply +24v; the negative electrode of the buzzer B1 is electrically connected with the collector electrode of the alarm control triode Q6, the base electrode of the alarm control triode Q6 is electrically connected with the first alarm voltage dividing resistor R34 and then is electrically connected with the alarm control end P02 of the singlechip in FIG. 2, and the base electrode of the alarm control triode Q6 is also electrically connected with the second alarm voltage dividing resistor R41 and then is grounded. When the water dispenser is abnormal (such as water leakage), the singlechip controls the alarm control triode Q6 to be conducted, and the buzzer B1 starts alarm prompt.

Preferably, an alarm protection diode D7 is also connected between the positive pole and the negative pole of the buzzer B1.

Further, as shown in fig. 5, the control circuit for the water dispenser further includes a filter element life display circuit, the filter element life display circuit includes a filter element life display diode VL4, an anode of the filter element life display diode is electrically connected to the current limiting resistor R8 and then connected to the filter element life display control end P12 of the singlechip in fig. 2, and a cathode of the filter element life display diode VL4 is grounded. The filter element service life display control end P12 of the singlechip can drive the filter element service life display diode VL4 to display light, and when the filter element service life is 0, the filter element service life display diode VL4 does not display light any more.

Preferably, the filter life display circuit shown in fig. 5 is used for displaying the life of the reverse osmosis membrane filter 5, and the filter life display circuit composed of the same circuit can be used for displaying the life of the PAC cotton filter 1.

Further, as shown in fig. 6, the control circuit for the water dispenser further comprises a water inlet valve control circuit, and the water inlet valve control circuit is electrically connected with the water inlet valve through an interface J5; the water inlet valve control circuit comprises a water inlet valve control field effect tube Q7, the drain electrode of the water inlet valve control field effect tube Q7 is electrically connected with the negative electrode (the first end of an interface J5) of the water inlet valve, the positive electrode (the second end of the interface J5) of the water inlet valve is electrically connected with a first direct current power supply +24V, the grid electrode of the water inlet valve control field effect tube Q7 is electrically connected with a water outlet control resistor R29 and then is electrically connected with the water inlet valve control end P14 of the singlechip in FIG. 2, and the source electrode of the water inlet valve control field effect tube Q7 is grounded.

When the inlet valve control end P14 of the singlechip drives the inlet valve control field effect transistor Q7 to be conducted, the negative electrode (the first end of the interface J5) of the inlet valve is grounded, and the inlet valve is opened.

In fig. 2, the control end P26 of the water inlet valve of the singlechip is also respectively and electrically connected with a resistor R31 and a resistor R32 and then grounded; the drain electrode of the water inlet valve control field effect transistor Q7 is electrically connected with the positive electrode of the protection diode D4, and the negative electrode of the protection diode D4 is connected with the first direct current power supply +24V. A filter capacitor C15 is also connected in series between the anode and the cathode of the protection diode D4.

Further, the control circuit for the water dispenser further comprises a booster pump control circuit, a flushing valve control circuit and a water outlet valve control circuit, wherein the booster pump control circuit, the flushing valve control circuit and the water outlet valve control circuit have the same circuit composition as the water inlet valve control circuit shown in the above figure 6, and the description is omitted herein.

Further, as shown in fig. 7, the control circuit for the water dispenser further includes a raw water TDS detection circuit, where the raw water TDS detection circuit includes a raw water TDS sensor, the raw water TDS detection circuit is electrically connected to the raw water TDS sensor through an interface J4, a power supply end of the raw water TDS sensor is electrically connected to a collector of the raw water detection triode, a sampling end of the raw water TDS sensor is electrically connected to a first sampling voltage dividing resistor and then is electrically connected to a raw water detection sampling end of the single chip microcomputer, and a sampling end of the raw water TDS sensor is further electrically connected to a second sampling voltage dividing resistor and then is grounded.

The raw water TDS detection circuit comprises a raw water TDS sensor, the raw water TDS sensor is electrically connected through an interface J4, a power end (a first end of the interface J4) of the raw water TDS sensor is electrically connected with a collector of a raw water detection triode Q3, the collector of the raw water detection triode Q4 is further electrically connected with a resistor R21 and then grounded, an emitter of the raw water detection triode Q3 is electrically connected with a second direct current power supply +5v, a base of the raw water detection triode Q4 is electrically connected with a raw water detection resistor R19 and then electrically connected with a raw water detection control end P20 of the singlechip in fig. 2, a sampling end (a second end of the interface J4) of the raw water TDS sensor is electrically connected with a raw water detection sampling end P10 of the singlechip in fig. 2 after being electrically connected with a first sampling voltage division resistor R23, and the sampling end of the raw water TDS sensor is further electrically connected with a second sampling voltage division resistor R25 and then grounded.

When the singlechip controls the raw water control triode Q3 to be conducted, the raw water TDS sensor starts to sample the TDS value of the raw water, and a sampled signal is transmitted to the singlechip through a sampling end of the raw water TDS sensor.

Preferably, the control circuit for the water dispenser further comprises a pure water TDS detection circuit, and the raw water TDS detection circuit and the pure water TDS detection circuit have the same composition and are not described herein again.

Further, as shown in fig. 8, the control circuit for the water dispenser further comprises a flow detection circuit, the flow detection circuit comprises a flowmeter, a power end of the flowmeter is electrically connected with a second direct current power supply, a signal end of the flowmeter is electrically connected with a first flow detection resistor and a second flow detection resistor and then is connected with the second direct current power supply, and an electrical connection part of the first flow detection resistor and the second flow detection resistor is electrically connected with a flow sampling end of the singlechip.

Further, as shown in fig. 8, the control circuit for the water dispenser further includes a flow detection circuit, and the flow detection circuit is electrically connected to the flow meter through the interface J2. The flow detection circuit comprises a flowmeter, a power end (a first core of an interface J2) of the flowmeter is electrically connected with a second direct-current power supply +5V, a grounding end (a third core of the interface J2) is grounded, a signal end (a second end of the interface J2) of the flowmeter is electrically connected with a first flow detection resistor R17 and a second flow detection resistor R15 and then is connected with the second direct-current power supply +5V, and an electric connection part of the first flow detection resistor R17 and the second flow detection resistor R15 is electrically connected with a flow sampling end P35 of the singlechip of FIG. 2.

The electric connection part of the first flow detection resistor R17 and the second flow detection resistor R15 is also electrically connected with the filter capacitor C14 and then grounded. When the water dispenser flows out pure water, the flowmeter can input signals to the singlechip through the signal end (the second end of the interface J2) to meter the water yield.

Further, as shown in fig. 9, the single-chip microcomputer is electrically connected with the high-voltage switch and the low-voltage switch, and it can be seen that the single-chip microcomputer is connected with the high-voltage switch and the low-voltage switch through the interface J6. The signal end (the fourth core of the interface J6) of the high-voltage switch is electrically connected with the resistor R35 and then is connected with the high-voltage signal acquisition end P45 of the singlechip in FIG. 2, and the grounding end (the third core of the interface J6) of the high-voltage switch is grounded.

The signal end (the second core of the interface J6) of the low-voltage switch is electrically connected with the resistor R37 and then is connected with the low-voltage signal acquisition end P44 of the singlechip in FIG. 2, and the grounding end (the first core of the interface J6) of the low-voltage switch is grounded.

Further, as shown in fig. 10, the control circuit for the water dispenser further comprises a power circuit, wherein the power circuit comprises a chip XL1509-5V, the input end of the chip XL1509-5V is input with a first direct current power supply +24V, and the output end of the chip XL1509-5V is output with a second direct current power supply +5V.

Specifically, an input end IN of the chip XL1509-5V is electrically connected with the thermistor RT1 and then connected with the negative electrode of a power input protection diode D1, and the positive electrode of the power input protection diode D1 is electrically connected with first direct current +24V; the input IN of the chip XL1509-5V is also electrically connected to the polarity filter capacitor C1 and the filter capacitor C3 and then grounded.

The output end OUT of the chip XL1509-5V is electrically connected with the inductor L1 and then connected with one end of the protection resistor F1, the other end of the protection resistor F2 outputs a second direct current power supply +5V, and the second direct current power supply +5V is also respectively electrically connected with the filter capacitor C6 and the filter capacitor C7 and then grounded.

The output end OUT of the chip XL1509-5V is further electrically connected with the first power output diode D2 and the second power output diode D3 and then outputs a third direct current power supply VCV_GPRS, and the third direct current power supply VCV_GPRS is used for supplying power to the Internet of things module.

Preferably, the output end OUT of the chip XL1509-5V is further electrically connected with the power supply output protection diode D4 and then grounded, the electric connection part of the inductor L1 and the protection resistor F1 is further electrically connected with the feedback end FB of the chip XL1509-5V, and the electric connection part of the inductor L1 and the protection resistor F2 is further respectively electrically connected with the filter capacitor C8 and the filter capacitor C5 and then grounded.

Further, as shown in fig. 11 to 14, the control circuit for the water dispenser further comprises an internet of things module electrically connected with the singlechip, and is connected with the remote control terminal through the internet of things module. The remote control terminal can be electronic mobile equipment (smart phone, tablet personal computer and the like), and can be connected with the intelligent water dispenser through the Internet of things module, so that a user can conveniently sweep codes to take water, remotely monitor the water dispenser and control the water dispenser.

The internet of things module comprises a chip EC800N and a SIM card, the chip EC800N is electrically connected with the SIM card, and the singlechip is connected with an asynchronous serial port of the chip EC 800N.

Further, as shown in fig. 12, the SIM card is fixed in the SIM card holder and electrically connected to the chip EC 800N. The power supply terminal sim_vdd of the SIM card holder in fig. 12 is connected to the usim_vdd pin of the chip EC800N in fig. 11, and is further electrically connected to the capacitor C2 and then grounded; after the reset terminal SIM_RST is connected with the resistor R1, the terminal SIM_RST is connected with the USIM_RST pin of the chip EC800N in FIG. 11; after the clock terminal SIM_CLK is connected with the resistor R2, the clock terminal SIM_CLK is connected to the USIM_CLK pin of the chip EC800N in FIG. 11; the I/0 terminal sim_io is connected to the usim_data pin of the chip EC800N in fig. 11 through the electrical connection resistor R3, and is also connected to the pull-up resistor R4 and then connected to the power supply terminal sim_vdd.

With reference to fig. 13 and 14, communication interconnection between the singlechip and the chip EC800N is an asynchronous serial port communication connection. The first serial port readout end P05 of the singlechip in fig. 2 is electrically connected to the collector of the first control triode Q2 in fig. 14, the base of the first control triode Q2 is electrically connected to the first current limiting resistor R18 and then connected to the fourth direct current power supply +1.8v, the fourth direct current power supply +1.8v is output by the power output end vdd_ext of the chip EC800N, and the emitter of the first control triode Q2 is electrically connected to the serial port write end main_txd of the chip EC800N in fig. 11.

Preferably, the first serial port reading end P05 of the singlechip is electrically connected with the first pull-up resistor R12 and then connected with the second direct current power supply +5V.

The first serial port reading end P05 of the singlechip can receive data from the chip EC800N, and when the first serial port reading end P05 of the singlechip outputs a low level, the first control triode Q2 is cut off, and the first serial port reading end P05 of the singlechip stops receiving the data.

In fig. 2, a first serial writing end P04 of the singlechip is electrically connected to an emitter of a second control triode Q1 in fig. 13, a base of the second control triode Q1 is electrically connected to a second current limiting resistor R11 and then connected to a fourth dc power supply +1.8v, and a collector of the second control triode Q1 is electrically connected to a serial reading end main_rxd of a chip EC 800N.

Preferably, the serial port read end main_rxd of the chip EC800N is further electrically connected to the second pull-up resistor R13 and then connected to the fourth dc power supply +1.8v.

The serial port read-out end main_rxd of the chip EC800N can receive data from the single chip microcomputer, and when the serial port read-out end main_rxd of the chip EC800N outputs a low level, the second control triode Q1 is turned off, and the serial port read-out end main_rxd of the chip EC800N stops receiving data.

Further, as shown in fig. 15, the control circuit for the water dispenser further includes a power-on control circuit for powering up the chip EC800N, the power-on control circuit includes a power-on control MOS transistor Q5, a source electrode of the Q5 of the power-on control MOS transistor is electrically connected to the third dc power supply vcv_gprs, a gate electrode is electrically connected to the power-on control terminal P41 of the singlechip in fig. 2, and a drain electrode is electrically connected to the power supply terminal VBAT of the chip EC 800N.

Preferably, in fig. 2, the power-on control terminal P41 of the singlechip is electrically connected with the first power-on voltage dividing resistor R28 and the second power-on voltage dividing resistor R29, and then connected to the Q5 source of the power-on control MOS transistor; the power supply end VBAT of the chip EC800N is further electrically connected to the filter capacitor C20 and the filter capacitor C19, and then grounded.

During normal operation, the singlechip controls the conduction of the power-on control MOS transistor Q5, so that the third direct-current power supply VCV_GPRS supplies power to the chip EC800N; when the singlechip controls the power-on control MOS tube Q5 to be cut off, the chip EC800N cuts off power supply, and then the singlechip controls the power-on control MOS tube Q5 to be turned on again, so that the power supply of the chip EC800N is realized, the power-on control of the chip EC800N is realized again, the restarting operation of the chip EC800N is realized, and the use reliability of the chip EC800N is ensured.

Therefore, the utility model discloses a control circuit for a water dispenser, which comprises a singlechip and a water leakage detection circuit, 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 water leakage detection control end of the singlechip, a signal end of the water leakage detection sensor is electrically connected with a first water leakage detection resistor and then is connected with a water leakage detection sampling end of the singlechip, and a signal end of the water leakage detection sensor is also electrically connected with a second water leakage detection resistor and then is grounded. When the water leakage detection sensor detects that the water dispenser leaks water, the signal end sends a signal to the water leakage detection sampling end of the singlechip, and the water dispenser can effectively detect whether the water dispenser leaks water or not.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the present utility model and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present utility model.

Claims (10)

1. A control circuit for a water dispenser, characterized by: 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 water leakage detection 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 with a water leakage detection sampling end of the single chip microcomputer, and a signal end of the water leakage detection sensor is also electrically connected with a second water leakage detection resistor and then is grounded.

2. The control circuit for a water dispenser of claim 1, wherein: the alarm circuit comprises a buzzer, the positive electrode of the buzzer is electrically connected with a first direct current power supply, the negative electrode of the buzzer is electrically connected with the collector electrode of an alarm control triode, the base electrode of the alarm control triode is electrically connected with the first alarm voltage dividing resistor and then is electrically connected with the alarm control end of the singlechip, and the base electrode of the alarm control triode is electrically connected with the second alarm voltage dividing resistor and then is grounded.

3. The control circuit for a water dispenser of claim 2, wherein: the filter element life display circuit comprises a filter element life display diode, wherein the anode of the filter element life display diode is electrically connected with a current limiting resistor and then connected with a filter element life display control end of the singlechip, and the cathode of the filter element life display diode is grounded.

4. A control circuit for a water dispenser as claimed in claim 3, wherein: the water inlet valve control circuit comprises a water inlet valve control field effect tube, the drain electrode of the water inlet valve control field effect tube is electrically connected with the negative electrode of the water inlet valve, the positive electrode of the water inlet valve is electrically connected with a first direct current power supply, the grid electrode of the water inlet valve control field effect tube is electrically connected with the water inlet valve control resistor and then is electrically connected with the water inlet valve control end of the singlechip, and the source electrode of the water inlet valve control field effect tube is grounded.

5. The control circuit for a water dispenser of claim 4, wherein: the water inlet valve control circuit is characterized by further comprising a booster pump control circuit, a flushing valve control circuit and a water outlet valve control circuit, wherein the booster pump control circuit, the flushing valve control circuit and the water outlet valve control circuit are identical to the water inlet valve control circuit in circuit composition.

6. The control circuit for a water dispenser of claim 5, wherein: the system comprises a singlechip, a raw water detection triode, a raw water detection resistor, a raw water detection triode and a pure water detection circuit, wherein the raw water detection circuit and the pure water detection circuit have the same composition, the raw water detection circuit comprises a raw water TDS sensor, the power end of the raw water TDS sensor is electrically connected with the collector of the raw water detection triode, the emitter of the raw water detection triode is electrically connected with a second direct current power supply, and the base of the raw water detection triode is electrically connected with the raw water detection resistor and then is connected with the raw water detection control end of the raw water detection triode; the sampling end of the raw water TDS sensor is electrically connected with the first sampling voltage dividing resistor and then is electrically connected with the raw water detection sampling end of the singlechip, and the sampling end of the raw water TDS sensor is also electrically connected with the second sampling voltage dividing resistor and then is grounded.

7. The control circuit for a water dispenser of claim 6, wherein: the flow detection circuit comprises a flow meter, a power end of the flow meter is electrically connected with a second direct current power supply, a signal end of the flow meter is electrically connected with a first flow detection resistor and a second flow detection resistor and then connected with the second direct current power supply, and an electrical connection part of the first flow detection resistor and the second flow detection resistor is electrically connected with a flow sampling end of the singlechip.

8. The control circuit for a water dispenser of claim 7, wherein: the singlechip is also electrically connected with the high-voltage switch and the low-voltage switch.

9. The control circuit for a water dispenser of claim 8, wherein: the power supply circuit comprises a chip XL1509-5V, wherein the input end of the chip XL1509-5V is input with a first direct current power supply, and the output end of the chip XL1509-5V is output with a second direct current power supply.

10. The control circuit for a water dispenser according to any one of claims 1 to 9, wherein: the intelligent electronic device further comprises an internet of things module connected with the singlechip, wherein the internet of things module comprises a chip EC800N and a SIM card, the chip EC800N is electrically connected with the SIM card, and the singlechip is connected with an asynchronous serial port between the chip EC 800N.