Overflow protection circuit, induction faucet and counter basin overflow protection system

Abstract

The utility model discloses an overflow protection circuit, an induction faucet and a counter basin overflow protection system, and relates to the technical field of bathroom accessories, the overflow protection circuit comprises a voltage stabilizing circuit, an ultrasonic ranging circuit, an infrared emitter control circuit, an amplifying circuit, a master controller and an electromagnetic valve driving circuit; the voltage stabilizing circuit is used for carrying out voltage stabilizing processing on the power supply voltage and then supplying power to a post-stage circuit; the ultrasonic ranging circuit is used for transmitting and receiving an ultrasonic signal, and generating and sending an overflow instruction to the main controller according to the ultrasonic signal; the infrared transmitter control circuit is used for transmitting an infrared signal; the amplifying circuit is used for receiving the infrared signal, converting the infrared signal into an analog signal and sending the analog signal to the main controller; the master controller is used for driving the electromagnetic valve driving circuit to control the on-off state of the electromagnetic valve according to the analog signal and the overflow instruction. By the adoption of the device, obstacles can be detected in real time so as to achieve the inductive water switching-on and switching-off function, and the water level can be detected in real time so as to achieve the water switching-off function when water is full.

Description

Technical Field

[0001] The utility model relates to the technical field of sanitary wares, in particular to an overflow protection circuit, an induction faucet and a washbasin overflow protection system. Background Art

[0002] In recent years, the electronic intelligent design has developed rapidly and been applied in the field of sanitary wares. Among them, due to the fact that the induction faucet can avoid cross-infection of bacteria and improve the convenience of use, the induction faucet has been widely applied in public places and families.

[0003] Currently, most of the induction faucets on the market adopt infrared induction. When an induction object is sensed, the induction faucet discharges water, and when no induction object is sensed, the induction faucet shuts off the water. Therefore, when the induction faucet has a mis-induction and continuously discharges water, it will cause waste of resources and property losses.

[0004] At the same time, the existing technology mainly installs a liquid level sensor on the side of the washbasin to identify the water level height of the washbasin for water shut-off control, or relies on the overflow hole on the washbasin to drain the excess water to protect the ground from being soaked by water, which has certain limitations. However, due to the presence of a ceramic body between the liquid level sensor and the measured liquid, the following problems will occur:

[0005] (1) It is difficult to install and fit the liquid level sensor with the ceramic basin. During long-term use, due to environmental influence, there will be a slight gap between the liquid level sensor and the ceramic basin, resulting in insensitive induction or even detection failure.

[0006] (2) The accuracy of the liquid level sensor is relatively low, and the normal measurement accuracy is about ±5m.

[0007] (3) The liquid level sensor cannot detect multiple water levels simultaneously and can only detect a single liquid level change.

[0008] (4) When installing, two groups of liquid level sensors are required to detect the liquid level and the U-shaped pipeline respectively. The structural design is complex, the installation is difficult, the cost is high, and the reliability of the entire design scheme is low. Summary of the Utility Model

[0009] The technical problem to be solved by the utility model is to provide an overflow protection circuit, an induction faucet and a washbasin overflow protection system, which can not only detect obstacles in real time to realize the function of sensing and switching water, but also detect the water level in real time to realize the function of shutting off the water when the water is full.

[0010] To solve the above technical problems, the present utility model provides an overflow protection circuit, which includes a voltage stabilizing circuit, an ultrasonic ranging circuit, an infrared emitter control circuit, an amplifying circuit, a main controller and a solenoid valve driving circuit; the voltage stabilizing circuit is respectively connected to the ultrasonic ranging circuit, the infrared emitter control circuit, the amplifying circuit, the main controller and the solenoid valve driving circuit, and is used for stabilizing the power supply voltage and then supplying power to the ultrasonic ranging circuit, the infrared emitter control circuit, the amplifying circuit, the main controller and the solenoid valve driving circuit; the ultrasonic ranging circuit is connected to the main controller, and is used for transmitting and receiving ultrasonic signals, and then generating and sending an overflow instruction to the main controller according to the ultrasonic signals; the infrared emitter control circuit is connected to the main controller, and is used for emitting infrared signals; the amplifying circuit is connected to the main controller, and is used for receiving infrared signals, and then converting the infrared signals into analog signals and sending them to the main controller; the main controller is connected to the solenoid valve driving circuit, and is used for driving the solenoid valve driving circuit to control the on-off state of the solenoid valve according to the analog signals and the overflow instruction.

[0011] As an improvement of the above solution, the ultrasonic ranging circuit includes two groups of ultrasonic transducers.

[0012] As an improvement of the above solution, the ultrasonic ranging circuit and the main controller are connected through a serial port.

[0013] As an improvement of the above solution, the amplifying circuit includes a first operational amplifier and a second operational amplifier. After the first operational amplifier and the second operational amplifier amplify the received infrared signals, they convert the infrared signals into analog signals and send them to the main controller.

[0014] As an improvement of the above solution, the overflow protection circuit further includes a voltage detection circuit respectively connected to the voltage stabilizing circuit and the main controller. The voltage detection circuit is used for detecting the power supply voltage and sending the detection signal to the main controller.

[0015] Correspondingly, the present utility model also provides an induction faucet, which includes a faucet body and the above overflow protection circuit, and the overflow protection circuit is arranged inside the faucet body.

[0016] As an improvement of the above solution, the ultrasonic ranging circuit includes two groups of ultrasonic transducers, and the ultrasonic transducers are arranged at the water outlet position of the faucet body.

[0017] As an improvement of the above solution, the infrared emitter control circuit includes an infrared emitter, and the amplifying circuit includes an infrared receiver. The infrared emitter and the infrared receiver are arranged at the front end of the faucet body.

[0018] Accordingly, the present utility model further provides a washbasin overflow protection system based on an induction faucet, including a washbasin and the above-mentioned induction faucet, and the induction faucet is arranged above the washbasin.

[0019] As an improvement of the above solution, the ultrasonic ranging circuit includes two groups of ultrasonic transducers, and the ultrasonic signal transmission direction of the ultrasonic transducers is perpendicular to the liquid level of the washbasin.

[0020] The beneficial effects of implementing the present utility model are as follows:

[0021] The overflow protection circuit of the present utility model realizes the function of sensing water on and off by detecting obstacles in real time through the mutual cooperation among a voltage stabilization circuit, an ultrasonic ranging circuit, an infrared emitter control circuit, an amplification circuit, a main controller and a solenoid valve drive circuit, and at the same time introducing infrared detection technology and ultrasonic ranging technology. It can also detect the water level in real time to realize the function of turning off the water when the water is full.

[0022] Furthermore, the ultrasonic transducers in the induction faucet of the present utility model are arranged at the water nozzle position of the faucet body, with a simple structure, convenient installation and low cost. At the same time, the infrared emitter and the infrared receiver are arranged at the front end of the faucet body, which is convenient for detecting obstacles.

[0023] In addition, the ultrasonic signal transmission direction of the ultrasonic transducers in the washbasin overflow protection system based on the induction faucet of the present utility model is perpendicular to the liquid level of the washbasin, which can realize accurate detection of the liquid level height in the washbasin, with high sensitivity and high measurement reliability. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of an embodiment of the overflow protection circuit of the present utility model;

[0025] Figure 2 is a circuit diagram of the voltage stabilization circuit in the overflow protection circuit of the present utility model;

[0026] Figure 3 is a circuit diagram of the overflow protection circuit of the present utility model;

[0027] Figure 4 is a schematic structural diagram of an embodiment of the induction faucet of the present utility model;

[0028] Figure 5 is a schematic structural diagram of an embodiment of the washbasin overflow protection system based on the induction faucet of the present utility model. Detailed Embodiment

[0029] To make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It is hereby declared that the terms of orientation such as up, down, left, right, front, back, inside and outside that appear or will appear in the text of the present utility model are only based on the accompanying drawings of the present utility model, and they do not specifically limit the present utility model.

[0030] See Figure 1 , Figure 1 which shows the specific structure of the water overflow protection circuit of the present utility model, and it includes a voltage stabilization circuit 1, an ultrasonic ranging circuit 2, an infrared emitter control circuit 3, an amplification circuit 4, a main controller 5 and a solenoid valve drive circuit 6, wherein:

[0031] The voltage stabilization circuit 1 is respectively connected to the ultrasonic ranging circuit 2, the infrared emitter control circuit 3, the amplification circuit 4, the main controller 5 and the solenoid valve drive circuit 6, and is used for stabilizing the power supply voltage and then supplying power to the ultrasonic ranging circuit 2, the infrared emitter control circuit 3, the amplification circuit 4, the main controller 5 and the solenoid valve drive circuit 6;

[0032] The ultrasonic ranging circuit 2 is connected to the main controller 5, and is used for emitting ultrasonic signals outward and receiving the reflected ultrasonic signals, and then generating an overflow instruction according to the reflected ultrasonic signals and sending the overflow instruction to the main controller 5;

[0033] The infrared emitter control circuit 3 is connected to the main controller 5, and is used for emitting infrared signals outward;

[0034] The amplification circuit 4 is connected to the main controller 5, and is used for receiving the reflected infrared signals, then converting the reflected infrared signals into analog signals and sending the analog signals to the main controller 5;

[0035] The main controller 5 is connected to the solenoid valve drive circuit 6, and is used for driving the solenoid valve drive circuit 6 to control the on-off state of the solenoid valve according to the analog signals and the overflow instruction.

[0036] Different from the prior art, the water overflow protection circuit of the present utility model simultaneously introduces infrared detection technology and ultrasonic ranging technology. It can not only detect obstacles in real time through infrared detection technology, so as to control the on-off state of the solenoid valve to realize the function of sensing the opening and closing of water, but also detect the water level in real time through ultrasonic ranging technology, so as to close the solenoid valve to realize the function of closing water when the water is full.

[0037] After the overflow protection circuit is powered on, the main controller 5 drives the infrared emitter control circuit 3 to work. The infrared emitter control circuit 3 emits infrared signals outward. When the infrared signals in the infrared emitter control circuit 3 encounter an obstacle, they are reflected. The amplifier circuit 4 receives the reflected infrared signals, amplifies the infrared signals and outputs an analog signal. The main controller 5 starts the water opening and closing actions according to the received analog signal. At the same time, after the overflow protection circuit is powered on, the main controller 5 drives the ultrasonic ranging circuit 2 to work. The ultrasonic ranging circuit 2 sends ultrasonic signals outward and starts timing. After the ultrasonic signals are reflected by the water surface or the washbasin, the ultrasonic ranging circuit 2 receives them and immediately stops timing, so as to calculate the current liquid level distance and judge whether the current washbasin is overflowing. Then, the ultrasonic ranging circuit 2 can send back an overflow instruction to the main controller 5, and the main controller 5 closes the solenoid valve to achieve overflow protection.

[0038] Furthermore, the overflow protection circuit further includes a voltage detection circuit 7 respectively connected to the voltage regulation circuit 1 and the main controller 5. The voltage detection circuit 7 is used to detect the power supply voltage and send the detection signal to the main controller 5, so that the main controller 5 can implement power-off detection according to the detection signal; for example, when the voltage detection circuit 7 detects that the power supply voltage is abnormal, it drives the solenoid valve drive circuit 6 to close the solenoid valve to achieve power-off protection.

[0039] Preferably, the overflow protection circuit further includes an indication circuit 8 connected to the main controller 5. The working state of the main controller 5 can be displayed in real time through the indication circuit 8; for example, when the main controller 5 works normally, the indication circuit 8 lights up; when the main controller 5 is abnormal, the indication circuit 8 goes out.

[0040] The following describes the voltage regulation circuit 1, the voltage detection circuit 7, the ultrasonic ranging circuit 2, the infrared emitter control circuit 3, the amplifier circuit 4, the main controller 5, the solenoid valve drive circuit 6 and the indication circuit 8 in detail with reference to specific circuit diagrams:

[0041] I. Voltage regulation circuit 1

[0042] As Figure 2As shown in the figure, the voltage stabilizing circuit 1 includes a voltage stabilizing chip U2, a first diode D1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first polarized capacitor E1, a second polarized capacitor E2, and a third polarized capacitor E3; the power input terminal Vin of the voltage stabilizing chip U3 is connected to an external power supply through the first diode D1, and the ground terminal GND is grounded; one ends of the second capacitor C2, the third capacitor C3, and the first polarized capacitor E1 are respectively connected to the power input terminal Vin of the voltage stabilizing chip U3, and the other ends are respectively grounded; one ends of the first capacitor C1, the second polarized capacitor E2, and the third polarized capacitor E3 are respectively connected to the power output terminal Vout of the voltage stabilizing chip U3, and the other ends are respectively grounded. Among them, the voltage stabilizing chip U3 is preferably an MD7333 chip, but not limited thereto, and can be selected according to actual situations.

[0043] It should be noted that through the voltage stabilizing chip U3, the external power supply can be converted into a low-voltage power supply of +3.3V to supply power to the subsequent circuits (ultrasonic ranging circuit 2, infrared emitter control circuit 3, amplifier circuit 4, main controller 5, and solenoid valve drive circuit 6).

[0044] II. Voltage detection circuit 7

[0045] As Figure 3 shown, the voltage detection circuit 7 includes a fourth capacitor C4, a third resistor R3, and a fourth resistor R4; among them, one ends of the fourth capacitor C4 and the fourth resistor R4 are respectively connected to the main controller 5, and the other ends are respectively grounded; one end of the third resistor R3 is connected to the main controller 5, and the other end is connected to the voltage stabilizing circuit 1 to detect the power supply voltage at the input end of the voltage stabilizing circuit 1.

[0046] During detection, after the power supply voltage is divided by the third resistor R3 and the fourth resistor R4, the corresponding detection signal can be sent to the main controller 5 to determine whether a power failure occurs.

[0047] III. Ultrasonic ranging circuit 2

[0048] As Figure 3 shown, the ultrasonic ranging circuit 2 includes two groups of ultrasonic transducers and a single-chip microcomputer U1. Through the single-chip microcomputer U1, serial communication can be achieved between the ultrasonic ranging circuit 2 and the main controller 5.

[0049] To ensure an identification accuracy of 1mm, the ultrasonic ranging circuit 2 needs to ensure a time identification error greater than 2.94us. Therefore, the single-chip microcomputer U1 with a main frequency of 72M is selected in this utility model, so that the timing accuracy is 0.01us, which fully meets the ranging requirements. Among them, the single-chip microcomputer U1 is preferably a PY32F040, but not limited thereto, and can be selected according to actual situations.

[0050] It should be noted that the ultrasonic ranging algorithm is a prior art. In the present utility model, the single-chip microcomputer U1 can internally embed the existing ultrasonic ranging algorithm to achieve accurate measurement of the water overflow situation.

[0051] In addition, in the present utility model, the ultrasonic ranging circuit 2 can be used as a slave device, and the main controller 5 can be used as a master device. Information interaction between the master device and the slave device can be achieved through serial communication.

[0052] Correspondingly, when the receiving end of the ultrasonic transducer receives an ultrasonic signal, it has a sine wave waveform.

[0053] IV. Infrared emitter control circuit 3

[0054] As Figure 3 shown, the infrared emitter control circuit 3 includes an infrared emitter D3, a ninth resistor R9, and an eighth capacitor C8. The negative electrode of the infrared emitting diode D3 is connected to the main controller 5, the positive electrode is grounded through the eighth capacitor C8 and connected to the voltage stabilizing circuit 1 through the ninth resistor R9.

[0055] During operation, the infrared emitter control circuit 3 emits infrared signals outward in real time through the infrared emitter D3 to detect obstacles.

[0056] V. Amplification circuit 4

[0057] As Figure 3 shown, the amplification circuit 4 includes a first operational amplifier U4, a second operational amplifier U5, an infrared receiver D2, a fifth capacitor C5, a first resistor R1, a second resistor R2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8; the positive input terminal of the first operational amplifier U4 is sequentially connected to the voltage stabilizing circuit 1 through the fifth capacitor C5 and the infrared receiver D2, the negative input terminal of the first operational amplifier U4 is grounded through the sixth resistor R6 and connected to the output terminal of the first operational amplifier U4 through the first resistor R1, and the output terminal of the first operational amplifier U4 is connected to the positive input terminal of the second operational amplifier U5; the negative input terminal of the second operational amplifier U5 is grounded through the fifth resistor R5 and connected to the output terminal of the second operational amplifier U5 through the second resistor R2, and the output terminal of the second operational amplifier U5 is connected to the main controller 5; one end of the seventh resistor R7 is connected to the positive input terminal of the first operational amplifier U4, and the other end is grounded; one end of the eighth resistor R8 is connected to the positive electrode of the infrared receiver D2, and the other end is grounded.

[0058] Therefore, the amplifier circuit 4 can construct a two-stage operational amplifier module through the first operational amplifier U4 and the second operational amplifier U5. Through the two-stage operational amplifier module, the infrared signal received by the infrared receiver D2 can be amplified twice, then the infrared signal is converted into an analog signal and sent to the main controller 5, and then the main controller 5 converts the analog signal into a digital signal to read the corresponding received voltage to control the solenoid valve drive circuit 6.

[0059] VI. Main Controller 5

[0060] As Figure 3 shown, in this embodiment, the main controller 5 includes a main control chip U3. The main control chip U3 can select the BS45F3340 chip, but it is not limited thereto, as long as it can implement simple logic processing functions.

[0061] VII. Solenoid Valve Drive Circuit 6

[0062] As Figure 3 shown, the solenoid valve drive circuit 6 includes a drive chip U6. Two output ports OUT1 and OUT2 of the drive chip U6 are respectively connected to the solenoid valve to control the on / off state of the solenoid valve in real time. Among them, the drive chip U6 is preferably TMI8230, but it is not limited thereto and can be selected according to actual situations.

[0063] VIII. Indicator Circuit 8

[0064] As Figure 3 shown, the indicator circuit 8 includes a light-emitting diode LED1 and a tenth resistor R10. The positive pole of the light-emitting diode LED1 is connected to the main controller 5, and the negative pole is grounded through the tenth resistor R10. Through the indicator circuit 8, the working state of the main controller 5 can be displayed in real time; for example, when the main controller 5 is working normally, the light-emitting diode LED1 is lit; when the main controller 5 is abnormal, the light-emitting diode LED1 is extinguished.

[0065] In summary, through the mutual cooperation among the voltage stabilization circuit 1, the voltage detection circuit 7, the ultrasonic ranging circuit 2, the infrared emitter control circuit 3, the amplifier circuit 4, the main controller 5, the solenoid valve drive circuit 6 and the indicator circuit 8, the present utility model can not only detect obstacles in real time to realize the function of inductive switch water, but also detect the water level in real time to realize the function of turning off the water when the water is full.

[0066] See Figure 4 , Figure 4 shows the specific structure of the inductive faucet 100 of the present utility model, which includes a faucet body and an overflow protection circuit. The overflow protection circuit is arranged inside the faucet body.

[0067] Different from the prior art, the induction faucet 100 of the present utility model is provided with both an infrared detection function and an ultrasonic detection function. It can not only detect obstacles in real time through the infrared detection function to control the on-off state of the solenoid valve, so as to realize the function of sensing the opening and closing of water, but also detect the water level in real time through the ultrasonic detection function to close the solenoid valve, so as to realize the function of turning off the water when the water is full.

[0068] Further, the ultrasonic ranging circuit 2 includes two groups of ultrasonic transducers 21. The ultrasonic transducers 21 are arranged at the water outlet 22 of the faucet body, with simple structure, convenient installation and low cost.

[0069] At the same time, the infrared emitter control circuit 3 includes an infrared emitter D3, and the amplifier circuit 4 includes an infrared receiver D2. The infrared emitter D3 and the infrared receiver D2 are arranged at the front end of the faucet body, which is convenient for detecting obstacles.

[0070] See Figure 5 , Figure 5 shows the specific structure of the washbasin overflow protection system based on the induction faucet of the present utility model, which includes a washbasin 101 and an induction faucet 100. The induction faucet 100 is arranged above the washbasin 101.

[0071] Among them, the ultrasonic ranging circuit 2 includes two groups of ultrasonic transducers 21 (see Figure 4 ), and the ultrasonic signal transmission direction of the ultrasonic transducer 21 is perpendicular to the liquid level of the washbasin 101.

[0072] It should be noted that by arranging the ultrasonic transducer 21 at the water outlet 22 of the faucet body and making the ultrasonic signal transmission direction of the ultrasonic transducer 21 perpendicular to the liquid level of the washbasin 101, the accurate detection of the liquid level height in the washbasin 101 can be realized, with high sensitivity and high measurement reliability.

[0073] The above is the preferred implementation mode of the present utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and retouches can still be made, and these improvements and retouches are also regarded as the protection scope of the present utility model.

Claims

1. An overflow protection circuit, characterized in that, It includes a voltage stabilizing circuit, an ultrasonic ranging circuit, an infrared emitter control circuit, an amplifying circuit, a main controller, and a solenoid valve driving circuit; The voltage stabilizing circuit is respectively connected to the ultrasonic ranging circuit, the infrared emitter control circuit, the amplifying circuit, the main controller, and the solenoid valve driving circuit, and is used for stabilizing the power supply voltage and then supplying power to the ultrasonic ranging circuit, the infrared emitter control circuit, the amplifying circuit, the main controller, and the solenoid valve driving circuit; The ultrasonic ranging circuit is connected to the main controller, and is used for transmitting and receiving ultrasonic signals, and then generating and sending an overflow instruction to the main controller according to the ultrasonic signals; The infrared emitter control circuit is connected to the main controller and is used for emitting infrared signals; The amplifying circuit is connected to the main controller, and is used for receiving infrared signals, and then converting the infrared signals into analog signals and sending them to the main controller; The main controller is connected to the solenoid valve driving circuit, and is used for driving the solenoid valve driving circuit to control the on-off state of the solenoid valve according to the analog signal and the overflow instruction.

2. The overflow protection circuit according to claim 1, wherein The ultrasonic ranging circuit includes two groups of ultrasonic transducers.

3. The overflow protection circuit according to claim 1, wherein The ultrasonic ranging circuit and the main controller are connected through a serial port.

4. The overflow protection circuit according to claim 1, characterized in that The amplifying circuit includes a first operational amplifier and a second operational amplifier. After the first operational amplifier and the second operational amplifier amplify the received infrared signals, they convert the infrared signals into analog signals and send them to the main controller.

5. The overflow protection circuit according to claim 1, wherein It also includes a voltage detection circuit respectively connected to the voltage stabilizing circuit and the main controller. The voltage detection circuit is used for detecting the power supply voltage and sending the detection signal to the main controller.

6. An induction faucet, characterized in that, It includes a faucet body and the overflow protection circuit according to any one of claims 1 to 5, and the overflow protection circuit is arranged inside the faucet body.

7. The induction faucet according to claim 6, wherein, The ultrasonic ranging circuit includes two groups of ultrasonic transducers, and the ultrasonic transducers are arranged at the water outlet of the faucet body.

8. The induction faucet according to claim 6, wherein, The infrared emitter control circuit includes an infrared emitter, and the amplifying circuit includes an infrared receiver. The infrared emitter and the infrared receiver are arranged at the front end of the faucet body.

9. A washbasin overflow protection system based on a sensor faucet, characterized in that, It includes a washbasin and the induction faucet according to any one of claims 6 to 8, and the induction faucet is arranged above the washbasin.

10. The basin overflow protection system based on an induction faucet as described in claim 9, characterized in that, The ultrasonic ranging circuit includes two groups of ultrasonic transducers, and the transmission direction of the ultrasonic signals of the ultrasonic transducers is perpendicular to the liquid level of the washbasin.

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