Wastewater discharge control circuit for reverse osmosis water purifier

Abstract

The utility model discloses a wastewater discharge control circuit for a reverse osmosis water purifier, and belongs to the technical field of circuit design. The system mainly comprises a power supply power-on feedback module, a power supply processing module, a charging management module, a single-chip microcomputer main control module and an electromagnetic valve output module. The input end of the power supply power-on feedback module is connected with a water purifier original circuit, the output end of the power supply power-on feedback module is in electric signal connection with a power-on detection circuit unit of the single-chip microcomputer main control module, and the single-chip microcomputer main control module controls the wastewater electromagnetic valve through the electromagnetic valve output module according to a feedback signal of the power-on detection circuit unit; and the output end of the power supply power-on feedback module also provides a working power supply for the charging management module through the power supply processing module. According to the utility model, a reliable hardware foundation is laid for the flexible flushing function of the RO membrane of the water purifier, the circuit design is simple and redundancy-free, the circuit performance is stable, the execution response speed of the electromagnetic valve is high, the manufacturing cost is low, the user experience friendliness is high, and the market application prospect is wide.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit design, and more specifically, it relates to a wastewater discharge control circuit for a reverse osmosis water purifier, which can maintain the self-operation of key components even when the whole machine is powered off, has a simple circuit design without redundancy, is economical and reliable, has stable circuit performance, has a fast solenoid valve execution response speed, has a high user-friendliness, and lays a reliable hardware foundation for the water purifier to realize the flexible flushing of the reverse osmosis RO membrane function. Background Art

[0002] Reverse osmosis water purifiers are generally composed of primary filtration devices (such as PP cotton filter elements, activated carbon filter elements, etc.), booster pumps, RO reverse osmosis membrane components, water inlet valves, wastewater valves, high-pressure switches, etc. Reverse osmosis membrane technology is a membrane separation and filtration technology that uses pressure difference as a driving force to separate pure water and wastewater from tap water.

[0003] Reverse osmosis can reduce the total dissolved solids (TDS) of the treated water. Under pressure, water molecules can pass through the RO membrane, while impurities such as inorganic salts, heavy metal ions, organic matter, colloids, bacteria, viruses, etc. in the water cannot pass through the RO membrane, thereby strictly distinguishing between pure water that can pass through and concentrated water that cannot pass through. Reverse osmosis technology is currently a very clean and effective treatment method in the field of water treatment.

[0004] In order to improve the life and filtration efficiency of the reverse osmosis membrane, it is necessary to regularly flush the reverse osmosis membrane to avoid clogging. The flushing method is to adjust the opening of the wastewater proportional valve to the maximum, discharge more water to remove the sediment on the RO membrane.

[0005] The reverse osmosis water purifiers currently on the market are generally divided into three categories:

[0006] 1) Barrel water storage type: The barrel water storage type temporarily stores the purified pure water in the barrel through the filter element. When water is used, the pure water in the barrel is discharged, thereby playing the role of water storage and discharge. Generally, a small flow RO membrane (75G-150G) is used, the water production speed is slow, and pure water cannot be directly discharged. The wastewater solution of this type of machine is generally composed of a combined wastewater valve (the solenoid valve controls the valve to be fully opened or closed according to a preset ratio). Each time the pure water wastewater valve starts to be stored in the barrel, the wastewater valve is opened for flushing for 18S. Therefore, the life of this reverse osmosis membrane will be better. When the water in the water storage barrel is used up, water cannot be used continuously, and the water production is very slow, resulting in inconvenience in use.

[0007] 2) Conventional direct-discharge type without a barrel: The direct-discharge type without a barrel directly discharges the purified pure water through the filter element. Generally, a large-flow RO membrane (400G-800G) is used, which has a fast water production speed and can continuously discharge pure water. The wastewater solution of this type of machine is generally to directly discharge wastewater through a proportional valve without a flushing function. Therefore, the life of this reverse osmosis membrane will decay faster.

[0008] 3) Intelligent type: With the continuous development of science and technology, intelligent machines have been born, whether with barrel or without barrel. There are many types of such machines, the water purification system is complicated, the cost is very high, and the sales price is often 4-7 times that of the above two models.

[0009] For water purifiers with barrel water storage and intelligent water purifiers, the current drive of the wastewater solenoid valve is generally started when the water purifier is powered on, and it will not be flexible according to the actual situation of whether the RO membrane needs to be flushed, resulting in serious waste of water resources, which is not environmentally friendly and energy-saving. For conventional direct-discharge water purifiers without flushing function, the reverse osmosis RO membrane decays quickly, has a short service life, and has high maintenance costs for users. Utility Model Content

[0010] The purpose of the utility model is to address the deficiencies in the prior art and to provide a wastewater discharge control circuit for a reverse osmosis water purifier, which can maintain the self-operation of key components even when the whole machine is powered off, has a simple circuit design without redundancy, is economical and reliable, has stable circuit performance, has a fast solenoid valve execution response speed, has a high user-friendliness, and lays a reliable hardware foundation for the water purifier to realize the flexible flushing of the reverse osmosis RO membrane function.

[0011] The utility model is realized by the following technical solutions:

[0012] A wastewater discharge control circuit for a reverse osmosis water purifier includes a power supply feedback module, a power supply processing module, a charging management module, a single-chip microcomputer main control module based on a single-chip microcomputer chip, and a solenoid valve output module electrically connected to a wastewater solenoid valve of the water purifier;

[0013] The input end of the power supply power-on feedback module is connected to the original circuit of the water purifier, and the output end thereof is connected to the electrical signal of the power-on detection circuit unit of the single-chip main control module. The single-chip main control module controls the wastewater solenoid valve through the solenoid valve output module according to the feedback signal of the power-on detection circuit unit;

[0014] The output end of the power supply feedback module also provides working power to the charging management module through the power supply processing module. During the power-on process of the water purifier, the charging management module provides working power to the running state of the single-chip main control module on the one hand, and charges the lithium battery on the other hand; after the water purifier is powered off, the lithium battery provides working power for the low-power state of the single-chip main control module.

[0015] Preferably, the power supply power-on feedback module filters and steps down the U1 voltage provided by the original circuit of the water purifier into a stable VCC, and VCC, as the input voltage of the power supply processing module, is then processed by the ME3116DC-DC power supply chip into the working voltage of the charging management module; the charging management module includes a lithium battery charging unit based on the TP4056 chip and a main control power supply unit based on the MIC5205 linear voltage regulator chip, the output end of the lithium battery charging unit is used to charge the lithium battery, and the VBAT node of the lithium battery charging unit is electrically connected to the battery voltage detection unit of the single-chip main control module; the VBAT node of the lithium battery charging unit is also electrically connected to the input end of the main control power supply unit based on the MIC5205 linear voltage regulator chip, and the main control power supply unit steps down the VBAT node voltage to provide working power for the single-chip main control module.

[0016] Preferably, the power supply power-on feedback module is provided with a power-on indication unit; the power-on indication unit is powered by VCC and comprises a resistor R4 and a light emitting diode LED4 connected in series;

[0017] The power processing module is provided with a processing indication unit; the processing indication unit is powered by the output end of the ME3116 DC-DC power chip, and comprises a resistor R3 and a light emitting diode LED3 connected in series;

[0018] The main control power supply unit is provided with a voltage reduction indicating unit; the voltage reduction indicating unit is powered by the output voltage DVCC of the MIC5205 linear voltage regulator chip, and comprises a resistor R11 and a light emitting diode LED5 connected in series.

[0019] Preferably, the power-on detection circuit unit includes a diode D9 electrically connected to the output voltage VCC of the power supply power-on feedback module, the diode D9 is connected in series with a resistor R40, the resistor R40 is electrically connected to the digital ground terminal DGND via a resistor R42, wherein the resistor R42 is connected in parallel with the capacitor C35, both ends of the capacitor C35 are connected in parallel with the voltage regulator tube Z6, and the cathode end of the voltage regulator tube Z6 is electrically connected to the first input pin of the single-chip microcomputer chip.

[0020] Preferably, the battery voltage detection unit includes a resistor R38 having one end electrically connected to the VBAT node, the resistor R38 is electrically connected to the digital ground terminal DGND via a resistor R41, a capacitor C33 is connected in parallel to both ends of the resistor R41, and an electrical node AD-BAT located between the resistor R38 and the resistor R41 is electrically connected to the second input pin of the single-chip microcomputer chip.

[0021] Preferably, the solenoid valve output module is based on the WSD4050DN chip, and the three source S terminals of the WSD4050DN chip are short-circuited and electrically connected to the ground terminal GND, and the source S terminal and the gate G terminal are connected to resistor R22 at both ends, one end of the resistor R22 is electrically connected to the anode end of the voltage regulator Z4, and the cathode end of the voltage regulator Z4 is connected to the other end of the resistor R22. The cathode end of the voltage regulator Z4 is electrically connected to the first output pin of the single-chip chip via resistor R26; the four drain D terminals of the WSD4050DN chip are short-circuited and electrically connected to one wiring terminal of the wastewater solenoid valve, and the other wiring terminal of the wastewater solenoid valve is electrically connected to the output voltage VCC of the power supply feedback module via a fuse F3, an anti-interference capacitor C18 is connected in series between VCC and GND, and a protection diode D6 is also connected between VCC and the drain D.

[0022] Preferably, the solenoid valve output module is also provided with a wastewater valve working indication unit;

[0023] The wastewater valve operation indication unit comprises a resistor R27 and a light emitting diode LED8, one end of the resistor R27 is electrically connected to VCC, and the other end of the resistor R27 is electrically connected to the drain D of the WSD4050DN chip via the light emitting diode LED8.

[0024] Preferably, the output pin of the single-chip microcomputer chip is electrically connected to the light-emitting diode LED6 via the resistor R12, and the light-emitting diode LED6 emits light when the internal timer of the single-chip microcomputer chip executes an interrupt.

[0025] Preferably, the control circuit further comprises a display module which is communicatively connected to the single-chip microcomputer chip and is used to display the working status of the circuit, and a sound reminder module for alarm prompts.

[0026] Compared with the prior art, the beneficial effects of the utility model are:

[0027] The utility model lays a reliable hardware foundation for the flexible flushing function of the reverse osmosis RO membrane of the water purifier. Even when the whole machine is powered off, the key components can be kept running automatically. The circuit design is simple and non-redundant, the circuit performance is stable, the solenoid valve has a fast execution response speed, the manufacturing cost is low, the user experience is highly friendly, and the market application prospects are broad;

[0028] The utility model designs a plurality of circuit operation indicating units, has reasonable circuit design, is convenient for debugging and troubleshooting, and effectively simplifies the fault detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is the principle system block diagram of the utility model;

[0030] Figure 2This is the circuit schematic diagram of the power-on feedback module and the power processing module of the utility model;

[0031] Figure 3 This is the circuit schematic diagram of the charging management module of the utility model;

[0032] Figure 4 This is the circuit schematic diagram of the single-chip microcomputer main control module of the utility model;

[0033] Figure 5 This is the circuit schematic diagram of the solenoid valve output module of the utility model;

[0034] Figure 6 The utility model is a circuit schematic diagram of a display module and a sound reminder module.

[0035] In the figure: 2, wastewater solenoid valve; 31, power supply feedback module; 32, power supply processing module; 33, charging management module; 331, main control power supply unit; 332, lithium battery charging unit; 34, single-chip main control module; 341, power-on detection circuit unit; 342, battery voltage detection unit; 343, single-chip chip; 35, display module; 36, sound reminder module; 37, lithium battery; 38, solenoid valve output module. DETAILED DESCRIPTION

[0036] In order to enable readers to better understand the design purpose of the utility model, the technical solution described in the utility model is further described in combination with the embodiments below. It should be noted that the directional nouns that may be involved in the following paragraphs, including but not limited to "up, down, left, right, front, back", etc., are based on the visual directions shown in the corresponding drawings of the specification, and they should not be and should not be regarded as limiting the protection scope or technical solution of the utility model. The purpose is only to facilitate technicians in this field to better understand the technical solution created by the utility model.

[0037] In the description of this specification, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0038] Example 1

[0039] As shown in the attached figure of the instruction manual Figure 1As shown, a wastewater discharge control circuit for a reverse osmosis water purifier includes a power supply feedback module 31, a power supply processing module 32, a charging management module 33, a single-chip microcomputer main control module 34 based on a single-chip microcomputer chip 343, and a solenoid valve output module 38 electrically connected to the wastewater solenoid valve of the water purifier;

[0040] The input end of the power supply feedback module 31 is connected to the original circuit of the water purifier, and the output end thereof is connected to the power-on detection circuit unit 341 of the single-chip main control module 34 by electrical signals. The single-chip main control module 34 controls the wastewater solenoid valve through the solenoid valve output module 38 according to the feedback signal of the power-on detection circuit unit 341;

[0041] The output end of the power supply feedback module 31 also provides working power to the charging management module 33 through the power supply processing module 32. During the power-on process of the water purifier, the charging management module 33 provides working power to the running state of the single-chip main control module 34 on the one hand, and charges the lithium battery on the other hand; after the water purifier is powered off, the lithium battery provides working power for the low-power state of the single-chip main control module 34.

[0042] The working principle of this embodiment is as follows: the output end of the power supply power-on feedback module 31 is electrically connected to the original circuit of the water purifier, for example, it is electrically connected to the booster pump motor of the original circuit. After the water purifier is powered on, the power supply power-on feedback module 31, on the one hand, feeds back the power-on signal to the power-on detection circuit unit 341, and on the other hand, converts the input voltage from the water purifier into the working voltage of the charging management module 33 through the power supply processing module 32. During the power-on process of the water purifier, the charging management module 33 provides working power to the single-chip main control module 34 for the running state, and on the other hand, charges the lithium battery. The so-called running state is a series of actions of the single-chip main control module 34 driving the wastewater solenoid valve through the solenoid valve output module 38 after the power-on detection circuit unit 341 detects that the power is on; for example, whether the wastewater solenoid valve is started and how long the single start is based on the length of the idle time (the interval between two water productions); for example, whether the wastewater solenoid valve is started and how long the single start is based on the water production time of the water purifier. The single-chip main control module 34 can determine whether the reverse osmosis RO membrane of the water purifier needs to be flushed according to the idle time and the water production time, which has strong flexibility and saves a lot of water resources.

[0043] After the single-chip microcomputer main control module 34 detects that the water purifier is powered off, the lithium battery will provide working power for the low-power state of the single-chip microcomputer main control module 34; that is, at this time, the solenoid valve output module 38 has no power input, the single-chip microcomputer chip 343 records the idle time, and waits for the next water production to start.

[0044] This embodiment lays a reliable hardware foundation for the flexible flushing function of the reverse osmosis RO membrane of the water purifier. Even when the whole machine is powered off, the key components can maintain self-operation. The circuit design is simple and has no redundancy, the circuit performance is stable, the solenoid valve has a fast execution response speed, the manufacturing cost is low, the user experience is highly friendly, and the market application prospects are broad.

[0045] Example 2

[0046] On the basis of the above-mentioned embodiments, this embodiment continues to describe in detail the technical features involved therein and the functions and roles played by the technical features in the present utility model, so as to help technicians in this field to fully understand the technical solution of the present utility model and reproduce it.

[0047] like Figure 1-Figure 4 As shown, a wastewater discharge control circuit for a reverse osmosis water purifier includes a power supply feedback module 31, a power supply processing module 32, a charging management module 33, a single-chip microcomputer main control module 34 based on a single-chip microcomputer chip 343, and a solenoid valve output module 38 electrically connected to the wastewater solenoid valve of the water purifier.

[0048] The input end of the power supply feedback module 31 is connected to the original circuit of the water purifier, and the output end thereof is connected to the power-on detection circuit unit 341 of the single-chip main control module 34 by electrical signals. The single-chip main control module 34 controls the wastewater solenoid valve through the solenoid valve output module 38 according to the feedback signal of the power-on detection circuit unit 341;

[0049] The output end of the power supply feedback module 31 also provides working power to the charging management module 33 through the power supply processing module 32. During the power-on process of the water purifier, the charging management module 33 provides working power to the running state of the single-chip main control module 34 on the one hand, and charges the lithium battery on the other hand; after the water purifier is powered off, the lithium battery provides working power for the low-power state of the single-chip main control module 34.

[0050] In this embodiment, the power supply power-on feedback module 31 filters and steps down the U1 voltage provided by the original circuit of the water purifier into a stable VCC. VCC is used as the input voltage of the power supply processing module 32 and then processed by the ME3116 DC-DC power supply chip into the working voltage of the charging management module 33; the charging management module 33 includes a lithium battery charging unit 332 based on the TP4056 chip and a main control power supply unit 331 based on the MIC5205 linear voltage regulator chip. The output end of the lithium battery charging unit 332 charges the lithium battery 37, and the VBAT node of the lithium battery charging unit 332 is electrically connected to the battery voltage detection unit 342 of the single-chip main control module 34; the VBAT node of the lithium battery charging unit 332 is also electrically connected to the input end of the main control power supply unit 331 based on the MIC5205 linear voltage regulator chip. The main control power supply unit 331 steps down the VBAT node voltage and provides working power to the single-chip main control module 34.

[0051] Specifically, Figure 2 As shown, the power supply feedback module 31 is composed of components such as a diode D1, a fuse F1, a capacitor C4, a voltage regulator Z1, an electrolytic capacitor CP1, an electrolytic capacitor C5, and a resistor R7. The original circuit voltage of the water purifier is generally 24V, and the power supply feedback module 31 filters and steps it down to VCC for use by the power supply processing module 32. In this embodiment, the power supply feedback module 31 is provided with a power-on indication unit; the power-on indication unit is powered by VCC, and includes a resistor R4 and a light-emitting diode LED4 connected in series. The power supply processing module 32 steps down VCC to 5V for use by the charging management module 33 through the ME3116DC-DC power supply chip and the peripheral circuit of the ME3116DC-DC power supply chip. The power supply processing module 32 is provided with a processing indication unit; the processing indication unit is powered by the output end of the ME3116DC-DC power supply chip, and includes a resistor R3 and a light-emitting diode LED3 connected in series. There is no redundant design, and the circuit design is simple and reliable.

[0052] like Figure 3 As shown, after obtaining the input voltage of 5V, the charging management module 33 charges the lithium battery plugged into the J2 port through the TP4056 chip and the peripheral circuit of the TP4056 chip, and at the same time provides the working voltage for the main control power supply unit 331 at the VBAT node. When the water purifier of this embodiment is working, the charging management module 33 charges the lithium battery 37. After charging for five minutes, it can be used for two to three days in a low-power state for the single-chip main control module 34. The main control power supply unit 331 is provided with a step-down indication unit; the step-down indication unit is powered by the output voltage DVCC of the MIC5205 linear voltage regulator chip, which includes a resistor R11 and a light-emitting diode LED5 connected in series. This embodiment can be used without additional power supply, which is very convenient.

[0053] like Figure 4As shown, the single-chip microcomputer chip 343 of the single-chip microcomputer main control module 34 of this embodiment adopts the STM8S103FP / STM8S003FP single-chip microcomputer, which has sufficient performance and low cost. The power-on detection circuit unit 341 of the single-chip microcomputer main control module 34 includes a diode D9 electrically connected to the output voltage VCC of the power supply power-on feedback module 31, the diode D9 is connected in series with a resistor R40, and the resistor R40 is electrically connected to the digital ground terminal DGND via a resistor R42, wherein the resistor R42 is connected in parallel with the capacitor C35, and both ends of the capacitor C35 are connected in parallel with the voltage regulator tube Z6, and the cathode end of the voltage regulator tube Z6 is electrically connected to the first input pin of the single-chip microcomputer chip 343. After the water purifier is powered on, the power supply feedback module 31 outputs the VCC voltage, and the POW-UP node of the power-on detection circuit unit 341 is at a high potential. After the single-chip microcomputer chip 343 detects that the POW-UP node is at a high potential, it knows that the water purifier has been powered on and working. At this time, the single-chip microcomputer chip 343 will drive the wastewater solenoid valve 2 to start according to the idle time that has been recorded in the low-power state. Generally speaking, the longer the idle time, the longer the opening time of the wastewater solenoid valve 2; of course, in the process of water production, the single-chip microcomputer chip 343 will also calculate the duration of water production. After reaching the set threshold, the single-chip microcomputer chip 343 will control the wastewater solenoid valve 2 to start flushing. When the water purifier is powered off, the POW-UP node is at a low potential, and the single-chip microcomputer chip 343 knows that the water purifier has been powered off. After power failure, the single-chip microcomputer chip 343 enters a low-power state.

[0054] The battery voltage detection unit 342 of the single-chip main control module 34 includes a resistor R38 electrically connected to the VBAT node at one end, the resistor R38 is electrically connected to the digital ground terminal DGND via the resistor R41, the two ends of the resistor R41 are connected in parallel with the capacitor C33, and the electrical node AD-BAT located between the resistor R38 and the resistor R41 is electrically connected to the second input pin of the single-chip chip 343. After the water purifier is powered on, the TP4056 chip is powered on and works. The TP4056 chip charges the lithium battery 37 during operation, and at the same time provides a stable working voltage to the main control power supply unit 331 at the VBAT node; after the water purifier is powered off, the TP4056 chip does not work, and at this time the lithium battery 37 delivers a stable voltage to the VBAT node, thereby providing a stable voltage to the main control power supply unit 331. The input end of the battery voltage detection unit 342 is the VBAT node. When the voltage input by the lithium battery is lower than the set threshold, the single-chip chip 343 will control the display module 35 to display and / or the sound reminder module 36 to sound a reminder. The circuit design is ingenious and reliable, the display reminder is intuitive, and it is highly user-friendly.

[0055] like Figure 5As shown, the solenoid valve output module 38 of this embodiment is based on the WSD4050DN chip, and the three source S terminals of the WSD4050DN chip are short-circuited and electrically connected to the ground terminal GND, and the source S terminal and the gate G terminal are connected to resistor R22 at both ends, one end of the resistor R22 is electrically connected to the anode end of the voltage regulator tube Z4, and the cathode end of the voltage regulator tube Z4 is connected to the other end of the resistor R22. The resistor R23 is connected, and the cathode end of the voltage regulator tube Z4 is electrically connected to the first output pin of the single-chip microcomputer chip 343 via the resistor R26; the four drain D terminals of the WSD4050DN chip are short-circuited and electrically connected to one wiring terminal of the wastewater solenoid valve 2, and the other wiring terminal of the wastewater solenoid valve 2 is electrically connected to the output voltage VCC of the power supply feedback module 31 through the fuse F3, an anti-interference capacitor C18 is connected in series between VCC and GND, and a protection diode D6 is also connected between VCC and the drain D. The peripheral circuit design of the WSD4050DN chip in this embodiment is ingenious. The three source S terminals are short-circuited and the four drain D terminals are short-circuited, which can effectively reduce the on-resistance and power consumption. The wastewater solenoid valve drive response speed is fast, and the situation that the entire circuit fails due to poor contact of a certain pin is effectively avoided. This embodiment is also provided with a wastewater valve working indication unit, which includes a resistor R27 and a light-emitting diode LED8. One end of the resistor R27 is electrically connected to VCC, and the other end of the resistor R27 is electrically connected to the drain D of the WSD4050DN chip through the light-emitting diode LED8. The circuit design is simple and ingenious, and economical and reasonable.

[0056] like Figure 6 As shown, the control circuit of this embodiment also includes a display module 35 for displaying the working state of the circuit, which is connected to the single-chip microcomputer chip 343 for communication, and a sound reminder module 36 for alarm prompts. The display module 35 and the sound reminder module 36 are conventional circuit designs, and are not described here to avoid cumbersome text.

[0057] like Figure 4 As shown, the output pin of the single-chip microcomputer chip 343 is electrically connected to the light-emitting diode LED6 via the resistor R12, and the light-emitting diode LED6 emits light when the internal timer of the single-chip microcomputer chip 343 executes an interrupt. This design is considered to improve the user experience, and can easily prompt the user whether the control circuit is in a normal working state. When the single-chip microcomputer chip 343 is in a low power consumption state, the display module 35 is in a closed state, and this design can realize the prompt function with relatively low energy consumption.

[0058] This embodiment lays a reliable hardware foundation for the flexible flushing function of the reverse osmosis RO membrane of the water purifier. Even when the whole machine is powered off, the key components can be kept running automatically. The circuit design is simple and non-redundant, the circuit performance is stable, the solenoid valve has a fast execution response speed, the manufacturing cost is low, the user experience is highly friendly, and the market application prospects are broad.

[0059] This embodiment designs a plurality of circuit operation indication units, the circuit design is reasonable, debugging and troubleshooting are convenient, and the fault detection process is effectively simplified.

[0060] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. All equivalent changes and modifications in shape, structure, features and spirit within the scope of the claims of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A wastewater discharge control circuit for a reverse osmosis water purifier, characterized in that: It comprises a power supply power-on feedback module (31), a power supply processing module (32), a charging management module (33), a single-chip microcomputer main control module (34) based on a single-chip microcomputer chip (343), and a solenoid valve output module (38) electrically connected to the wastewater solenoid valve of the water purifier; The input end of the power supply power-on feedback module (31) is connected to the original circuit of the water purifier, and the output end thereof is connected to the electrical signal of the power-on detection circuit unit (341) of the single-chip computer main control module (34); the single-chip computer main control module (34) controls the wastewater solenoid valve via the solenoid valve output module (38) according to the feedback signal of the power-on detection circuit unit (341); The output end of the power supply feedback module (31) also provides working power to the charging management module (33) via the power supply processing module (32). During the power-on process of the water purifier, the charging management module (33) provides working power to the single-chip computer main control module (34) in an operating state and charges the lithium battery on the other hand. After the water purifier is powered off, the lithium battery provides working power to the single-chip computer main control module (34) in a low power consumption state.

2. The wastewater discharge control circuit for a reverse osmosis water purifier according to claim 1, characterized in that: The power supply power-on feedback module (31) filters and steps down the voltage of U1 provided by the original circuit of the water purifier into a stable VCC, and the VCC is used as the input voltage of the power supply processing module (32) and then processed by the ME3116 DC-DC power supply chip into the working voltage of the charging management module (33); the charging management module (33) comprises a lithium battery charging unit (332) based on a TP4056 chip and a main control power supply unit (331) based on a MIC5205 linear voltage regulator chip, the output end of the lithium battery charging unit (332) charges the lithium battery (37), and the VBAT node of the lithium battery charging unit (332) is electrically connected to the battery voltage detection unit (342) of the single-chip microcomputer main control module (34); the VBAT node of the lithium battery charging unit (332) is also electrically connected to the input end of the main control power supply unit (331) based on the MIC5205 linear voltage regulator chip, and the main control power supply unit (331) steps down the voltage of the VBAT node and provides the working power supply for the single-chip microcomputer main control module (34).

3. A wastewater discharge control circuit for a reverse osmosis water purifier according to claim 2, characterized in that: The power supply power-on feedback module (31) is provided with a power-on indication unit; the power-on indication unit is powered by VCC and comprises a resistor R4 and a light-emitting diode LED4 connected in series; The power processing module (32) is provided with a processing indication unit; the processing indication unit is powered by the output end of the ME3116 DC-DC power supply chip, and comprises a resistor R3 and a light emitting diode LED3 connected in series; The main control power supply unit (331) is provided with a voltage reduction indication unit; the voltage reduction indication unit is powered by the output voltage DVCC of the MIC5205 linear voltage regulator chip, and comprises a resistor R11 and a light emitting diode LED5 connected in series.

4. A wastewater discharge control circuit for a reverse osmosis water purifier according to claim 1 or 2, characterized in that: The power-on detection circuit unit (341) comprises a diode D9 electrically connected to the output voltage VCC of the power supply power-on feedback module (31), the diode D9 being connected in series with a resistor R40, the resistor R40 being electrically connected to the digital ground terminal DGND via a resistor R42, wherein the resistor R42 is connected in parallel with a capacitor C35, both ends of the capacitor C35 are connected in parallel with a voltage regulator tube Z6, and the cathode end of the voltage regulator tube Z6 is electrically connected to the first input pin of the single-chip microcomputer chip (343).

5. The wastewater discharge control circuit for a reverse osmosis water purifier according to claim 2, characterized in that: The battery voltage detection unit (342) comprises a resistor R38 having one end electrically connected to the VBAT node, the resistor R38 being electrically connected to the digital ground terminal DGND via a resistor R41, the two ends of the resistor R41 being connected in parallel to a capacitor C33, and an electrical node AD-BAT located between the resistor R38 and the resistor R41 being electrically connected to a second input pin of the single-chip microcomputer chip (343).

6. The wastewater discharge control circuit for a reverse osmosis water purifier according to claim 1, characterized in that: The solenoid valve output module (38) is based on a WSD4050DN chip. The three source S terminals of the WSD4050DN chip are short-circuited and electrically connected to the ground terminal GND, and the source S terminal and the gate G terminal are connected to resistor R22 at both ends. One end of the resistor R22 is electrically connected to the anode end of the voltage regulator tube Z4, and a resistor R23 is connected between the cathode end of the voltage regulator tube Z4 and the other end of the resistor R22. The cathode end of the voltage regulator tube Z4 is electrically connected to the first output pin of the single-chip microcomputer chip (343) via a resistor R26. The four drain D terminals of the WSD4050DN chip are short-circuited and electrically connected to one wiring terminal of the wastewater solenoid valve (2). The other wiring terminal of the wastewater solenoid valve (2) is electrically connected to the output voltage VCC of the power supply feedback module (31) via a fuse F3. An anti-interference capacitor C18 is connected in series between VCC and GND. A protection diode D6 is also connected between VCC and the drain D.

7. A wastewater discharge control circuit for a reverse osmosis water purifier according to claim 6, characterized in that: The solenoid valve output module (38) is also provided with a wastewater valve operation indication unit; The wastewater valve operation indication unit comprises a resistor R27 and a light emitting diode LED8, one end of the resistor R27 is electrically connected to VCC, and the other end of the resistor R27 is electrically connected to the drain D of the WSD4050DN chip via the light emitting diode LED8.

8. The wastewater discharge control circuit for a reverse osmosis water purifier according to claim 1, characterized in that: The output pin of the single-chip microcomputer chip (343) is electrically connected to a light-emitting diode LED6 via a resistor R12, and the light-emitting diode LED6 emits light when an internal timer of the single-chip microcomputer chip (343) executes an interrupt.

9. The wastewater discharge control circuit for a reverse osmosis water purifier according to claim 1, characterized in that: The control circuit also includes a display module (35) communicatively connected to the single-chip microcomputer chip (343) and used to display the circuit working state, and a sound reminder module (36) for alarm prompts.

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