Ultrasonic spill-proof sensor

Abstract

The utility model relates to the technical field of sensors, in particular to an ultrasonic spill-proof sensor, which comprises a transmitting transducer, a receiving transducer, a driving circuit, an amplifying and filtering circuit, a detection circuit, a power supply module and an MCU (Microprogrammed Control Unit) processor. By means of the structure, the MCU processor excites the transmitting transducer to transmit strong ultrasonic waves, the ultrasonic waves are reflected after being transmitted in the air and encountering all the faces of the cup, and the receiving transducer enables part of the reflected waves to obtain electric signals due to the inverse piezoelectric effect. Due to the fact that the height difference exists between the cup edge and the cup bottom, the incidence path and the reflection path of the cup edge and the cup bottom are inconsistent in the process from transmitting to receiving of ultrasonic waves, and finally the fact that an obvious phase difference exists between two echo signals is shown, the function of recognizing whether a cup exists or not is achieved, and whether the cup exists or not is recognized through the sensor. Therefore, manual control signals output to the water storage system can be replaced, and the water storage system is enabled to discharge water or be closed.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and more specifically, to an ultrasonic spill prevention sensor. Background Technology

[0002] In the current technology, when water needs to be dispensed, it is generally necessary to manually operate the switch. That is, a human needs to output an operation signal to the water storage system to allow water to flow or to turn it off. It is impossible to identify the water cup and then control the water flow or shut-off. This is quite inconvenient and inefficient in actual use. Utility Model Content

[0003] The purpose of this invention is to provide an ultrasonic overflow prevention sensor to solve the problem in the prior art that requires manual output of control signals to the water storage system.

[0004] This utility model is achieved through the following technical solution:

[0005] An ultrasonic spill prevention sensor includes a transmitting transducer, a receiving transducer, a driving circuit, an amplification and filtering circuit, a detection circuit, a power supply module, and an MCU processor. One end of the driving circuit is connected to the transmitting transducer, and the other end is connected to the MCU processor. The receiving transducer is connected to the amplification and filtering circuit. The amplification and filtering circuit is connected to both the detection circuit and the MCU processor. The other end of the detection circuit is connected to the MCU processor. The power supply module is connected to the driving circuit.

[0006] Preferably, the MCU processor includes an ADC module and a data processing module, and the ADC module is connected to the data processing module.

[0007] Preferably, the amplification and filtering circuit includes a first-stage operational amplifier module and a second-stage operational amplifier module. The input terminal of the first-stage operational amplifier module is connected to the receiving transducer, and its output terminal is connected to the input terminal of the second-stage operational amplifier module. The output terminal of the second-stage operational amplifier module is connected to the detection circuit and the ADC module, respectively.

[0008] Preferably, it also includes a main control board and a power management module. The main control board and the power management module are used to control the power supply of the power module. The main control board is connected to the data processing module through a communication interface.

[0009] Preferably, the transmitting transducer includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first acquisition module, and a second acquisition module;

[0010] The first resistor is connected to the third resistor and the MOSFET respectively, the second resistor is connected to the fourth resistor and the MOSFET respectively, and the other ends of the third resistor and the fourth resistor are connected to the MOSFET at the same time;

[0011] The first acquisition module and the second acquisition module are respectively connected to the MOS transistor.

[0012] Preferably, the first acquisition module includes a fifth resistor, a sixth resistor, a seventh resistor, a first crystal, a first diode, a second diode, and a first transformer;

[0013] The fifth resistor is connected to the first transformer, and the two ends of the parallel connection between the first crystal and the sixth resistor are connected to the first transformer.

[0014] One end of the first diode and the second diode connected in parallel is connected to the seventh resistor, and the other end is connected to the sixth resistor. The other end of the seventh resistor is connected to the other end of the sixth resistor.

[0015] Preferably, the second acquisition module includes an eighth resistor, a ninth resistor, a tenth resistor, a second crystal, a third diode, a fourth diode, and a second transformer;

[0016] The eighth resistor is connected to the second transformer, and the two ends of the parallel connection between the second crystal and the ninth resistor are connected to the second transformer.

[0017] One end of the third and fourth diodes connected in parallel is connected to the tenth resistor, and the other end is connected to the ninth resistor. The other end of the seventh resistor is connected to the other end of the sixth resistor.

[0018] Preferably, the receiving transducer includes a first electronic switch, a second electronic switch, a first capacitor, and a second capacitor. The first acquisition module is connected to the first capacitor, and the other end of the first capacitor is connected to the first electronic switch. The second acquisition module is connected to the second capacitor, and the other end of the second capacitor is connected to the second electronic switch. One end of the first electronic switch and the second electronic switch is simultaneously connected to the first-stage operational amplifier module.

[0019] Preferably, the first-stage operational amplifier module includes an eleventh resistor R30, a twelfth resistor R31, a thirteenth resistor, a third capacitor, a fourth capacitor, and a first operational amplifier unit;

[0020] The eleventh resistor is connected to the third capacitor and the fourth capacitor. The other end of the third capacitor is connected to the thirteenth resistor and the first operational amplifier unit, respectively. The other end of the fourth capacitor is connected to the thirteenth resistor and the second operational amplifier module, respectively. The twelfth resistor is connected to the first operational amplifier unit.

[0021] Preferably, the secondary operational amplifier module includes a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a fifth capacitor, a sixth capacitor, and a second operational amplifier unit;

[0022] One end of the fourteenth resistor and the fifteenth resistor are connected to one end of the fifth capacitor and the sixth capacitor, respectively, and the other end of the fourteenth resistor is connected to the thirteenth resistor, the first operational amplifier unit and the fourth capacitor.

[0023] The other end of the fifth capacitor is connected to the sixteenth resistor and the second operational amplifier unit, respectively, and the other end of the sixteenth resistor is connected to the second operational amplifier unit and the sixth capacitor.

[0024] The technical solution of this utility model has at least the following advantages and beneficial effects:

[0025] The structure of this invention mainly includes a transmitting transducer, a receiving transducer, a driving circuit, an amplification and filtering circuit, a detection circuit, a power supply module, and an MCU processor. One end of the driving circuit is connected to the transmitting transducer, and the other end is connected to the MCU processor. The receiving transducer is connected to the amplification and filtering circuit, which is connected to both the detection circuit and the MCU processor. The other end of the detection circuit is connected to the MCU processor, and the power supply module is connected to the driving circuit. Through this structure, the MCU processor excites the transmitting transducer to emit strong ultrasonic waves. These ultrasonic waves propagate through the air and are reflected after encountering various surfaces of the cup. The receiving transducer, due to the inverse piezoelectric effect, receives a partial electrical signal from the reflected waves. Because of the height difference between the rim and bottom of the cup, the incident and reflected paths of the ultrasonic waves are inconsistent during transmission and reception, resulting in a significant phase difference between the two echo signals. This enables the sensor to identify the presence or absence of a cup. By using this sensor to identify the presence or absence of a cup, it can replace manual control signals to the water storage system, thereby causing the system to dispense or shut down. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the transmitting transducer of this utility model;

[0029] Figure 3 This is a schematic diagram of the receiving transducer, the first-stage operational amplifier module, and the second-stage operational amplifier module of this utility model.

[0030] Icons: R20 - First resistor, R21 - Second resistor, R50 - Third resistor, R51 - Fourth resistor, R22 - Fifth resistor, R27 - Sixth resistor, R29 - Seventh resistor, R23 - Eighth resistor, R26 - Ninth resistor, R28 - Tenth resistor, R30 - Eleventh resistor, R31 - Twelfth resistor, R32 - Thirteenth resistor, R34 - Fourteenth resistor, R35 - Fifteenth resistor, R36 - Sixteenth resistor, Q1 - MOSFET, K1 K1-First crystal, K2-Second crystal, D1-First diode, D2-Second diode, D3-Third diode, D4-Fourth diode, L1-First transformer, L2-Second transformer, U6-First electronic switch, U5-Second electronic switch, U12-First operational amplifier unit, U13-Second operational amplifier unit, C25-First capacitor, C24-Second capacitor, C26-Third capacitor, C27-Fourth capacitor, C28-Fifth capacitor, C29-Sixth capacitor. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Reference Figures 1-3 The present invention provides an ultrasonic spill prevention sensor, comprising a transmitting transducer, a receiving transducer, a driving circuit, an amplification and filtering circuit, a detection circuit, a power supply module, and an MCU processor. One end of the driving circuit is connected to the transmitting transducer, and the other end is connected to the MCU processor. The receiving transducer is connected to the amplification and filtering circuit. The amplification and filtering circuit is connected to both the detection circuit and the MCU processor. The other end of the detection circuit is connected to the MCU processor. The power supply module is connected to the driving circuit.

[0033] Secondly, the MCU processor includes an ADC module and a data processing module, with the ADC module connected to the data processing module.

[0034] Specifically, the amplification and filtering circuit includes a first-stage operational amplifier module and a second-stage operational amplifier module. The input terminal of the first-stage operational amplifier module is connected to the receiving transducer, and its output terminal is connected to the input terminal of the second-stage operational amplifier module. The output terminal of the second-stage operational amplifier module is connected to the detection circuit and the ADC module, respectively.

[0035] The power supply section provides 5V power to the drive circuit and 3.3V power to the MCU; the drive circuit boosts the excitation signal and applies it to the transmitting transducer, and reduces the aftershock of the transmitting transducer; the first-stage amplifier circuit is used to amplify the voltage signal generated by the inverse piezoelectric effect and filter out the DC signal.

[0036] The secondary amplifier and filter circuit is an infinite gain multi-feedback bandpass filter, which can achieve high gain at the center frequency while attenuating interference signals at other frequencies.

[0037] Based on the detection principle, phase information is required. Therefore, the envelope of the echo signal is obtained through the detection circuit, thereby reducing the frequency of the sampling signal and reducing the complexity of data processing.

[0038] ADC module: Converts analog signals into digital signals for easier data processing; Communication section: Transmits information about the cup, various commands, and performs program upgrades; MCU data processing and logic control section: Generates excitation signals, processes sampled data, configures the ADC, and communicates with external systems.

[0039] This sensor works by exciting a transmitting transducer to operate at its resonant frequency, emitting strong ultrasonic waves. These waves propagate through the air and are reflected by various surfaces of the cup. The receiving transducer, due to the inverse piezoelectric effect, receives a portion of the reflected waves as an electrical signal. Because of the height difference between the cup's rim and bottom (or the liquid surface), the incident and reflected paths of the ultrasonic waves are inconsistent during transmission, resulting in a significant phase difference between the two echo signals. Ideally, only echoes from the rim and bottom (or liquid surface) are received, indicating only a phase difference, which is considered the presence of a cup. When no cup is present, only an echo from the tabletop is received, indicating the absence of a cup, thus achieving the function of "identifying the presence or absence of a cup." When a cup is present, if the phase difference is less than a set value, water begins to flow, achieving the function of "automatic water dispensing." As the liquid level rises, the phase difference gradually decreases, and at a certain point, when the phase difference equals the set value, water dispensing stops, achieving the function of "automatic water shut-off." If the cup is removed during water dispensing, the flow will change from two echoes to one. This will be recognized as a change from a cup-present state to a cup-free state, and the water will immediately stop, thus achieving the "cup removal stops" function. The system can be divided into three parts: power supply, analog signal, and digital signal. The power supply section provides the power supply voltage to the drive circuit and MCU. The analog section consists of the drive circuit and two-stage operational amplifiers. The digital section includes the generation of excitation signals, ADC sampling, processing of sampled data, various control signals, and communication protocols.

[0040] An exemplary embodiment of this utility model further includes a main control board and a power management module. The main control board and the power management module are used to control the power supply of the power module. The main control board is connected to the data processing module through a communication interface.

[0041] The transmitting transducer includes a first resistor R20, a second resistor R21, a third resistor R50, a fourth resistor R51, a first acquisition module, and a second acquisition module;

[0042] The first resistor R20 is connected to the third resistor R50 and the MOSFET Q1 respectively. The second resistor R21 is connected to the fourth resistor R51 and the MOSFET Q1 respectively. The other ends of the third resistor R50 and the fourth resistor R51 are also connected to the MOSFET Q1.

[0043] The first acquisition module and the second acquisition module are respectively connected to MOSFET Q1.

[0044] Specifically, the first acquisition module includes a fifth resistor R22, a sixth resistor R27, a seventh resistor R29, a first crystal K1, a first diode D1, a second diode D2, and a first transformer L1;

[0045] The fifth resistor R22 is connected to the first transformer L1, and the two ends of the first crystal K1 and the sixth resistor R27 connected in parallel are connected to the first transformer L1.

[0046] One end of the first diode D1 and the second diode D2 connected in parallel is connected to the seventh resistor R29, and the other end is connected to the sixth resistor R27. The other end of the seventh resistor R29 is connected to the other end of the sixth resistor R27.

[0047] In one exemplary embodiment of this utility model, the second acquisition module includes an eighth resistor R23, a ninth resistor R26, a tenth resistor R28, a second crystal K2, a third diode D3, a fourth diode D4, and a second transformer L2.

[0048] The eighth resistor R23 is connected to the second transformer L2, and the two ends of the parallel connection between the second crystal K2 and the ninth resistor R26 are connected to the second transformer L2.

[0049] One end of the parallel connection of the third diode D3 and the fourth diode D4 is connected to the tenth resistor R28, and the other end is connected to the ninth resistor R26. The other end of the seventh resistor R29 is connected to the other end of the sixth resistor R27.

[0050] Specifically, the first resistor R20 is connected to the G1 interface of MOSFET Q1, the second resistor R21 is connected to the G2 interface of MOSFET Q1, the first transformer L1 is connected to the D1 interface of MOSFET Q1, and the second transformer L2 is connected to the D2 interface of MOSFET Q1.

[0051] In one exemplary embodiment of this utility model, the receiving transducer includes a first electronic switch U6, a second electronic switch U5, a first capacitor C25, and a second capacitor C24. A first acquisition module is connected to the first capacitor C25, and the other end of the first capacitor C25 is connected to the first electronic switch U6. A second acquisition module is connected to the second capacitor C24, and the other end of the second capacitor C24 is connected to the second electronic switch U5. One end of the first electronic switch U6 and the second electronic switch U5 is simultaneously connected to a first-stage operational amplifier module.

[0052] In one exemplary embodiment of this utility model, the first-stage operational amplifier module includes an eleventh resistor R30, a twelfth resistor R31, a thirteenth resistor R32, a third capacitor C26, a fourth capacitor C27, and a first operational amplifier unit U12.

[0053] The eleventh resistor R30 is connected to the third capacitor C26 and the fourth capacitor C27. The other end of the third capacitor C26 is connected to the thirteenth resistor R32 and the first operational amplifier unit U12, respectively. The other end of the fourth capacitor C27 is connected to the thirteenth resistor R32 and the second operational amplifier module, respectively. The twelfth resistor R31 is connected to the first operational amplifier unit U12.

[0054] In one exemplary embodiment of this utility model, the two-stage operational amplifier module includes a fourteenth resistor R34, a fifteenth resistor R35, a sixteenth resistor R36, a fifth capacitor C28, a sixth capacitor C29, and a second operational amplifier unit U13.

[0055] One end of the fourteenth resistor R34 and the fifteenth resistor R35 are connected to one end of the fifth capacitor C28 and the sixth capacitor C29, respectively. The other end of the fourteenth resistor R34 is connected to the thirteenth resistor R32, the first operational amplifier unit U12 and the fourth capacitor C27, respectively.

[0056] The other end of the fifth capacitor C28 is connected to the sixteenth resistor R36 and the second operational amplifier unit U13, respectively. The other end of the sixteenth resistor R36 is connected to the second operational amplifier unit U13 and the sixth capacitor C29.

[0057] The MOSFET Q1 is model QS6K1TR, the first electronic switch U6 and the second electronic switch U5 are model SN74LVC1G66DBVR, the first operational amplifier unit U12 is model GS8721, and the second operational amplifier unit U13 is model RS8751.

[0058] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An ultrasonic spill prevention sensor, characterized in that, The device includes a transmitting transducer, a receiving transducer, a driving circuit, an amplification and filtering circuit, a detection circuit, a power supply module, and an MCU processor. One end of the driving circuit is connected to the transmitting transducer, and the other end is connected to the MCU processor. The receiving transducer is connected to the amplification and filtering circuit. The amplification and filtering circuit is connected to both the detection circuit and the MCU processor. The other end of the detection circuit is connected to the MCU processor. The power supply module is connected to the driving circuit.

2. The ultrasonic spill prevention sensor according to claim 1, characterized in that, The MCU processor includes an ADC module and a data processing module, and the ADC module is connected to the data processing module.

3. An ultrasonic spill prevention sensor according to claim 2, characterized in that, The amplification and filtering circuit includes a first-stage operational amplifier module and a second-stage operational amplifier module. The input terminal of the first-stage operational amplifier module is connected to the receiving transducer, and its output terminal is connected to the input terminal of the second-stage operational amplifier module. The output terminal of the second-stage operational amplifier module is connected to the detection circuit and the ADC module, respectively.

4. An ultrasonic spill prevention sensor according to claim 3, characterized in that, It also includes a main control board and a power management module. The main control board and the power management module are used to control the power supply of the power module. The main control board is connected to the data processing module through a communication interface.

5. An ultrasonic spill prevention sensor according to claim 4, characterized in that, The transmitting transducer includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first acquisition module, and a second acquisition module; The first resistor is connected to the third resistor and the MOSFET respectively, the second resistor is connected to the fourth resistor and the MOSFET respectively, and the other ends of the third resistor and the fourth resistor are connected to the MOSFET at the same time; The first acquisition module and the second acquisition module are respectively connected to the MOS transistor.

6. An ultrasonic spill prevention sensor according to claim 5, characterized in that, The first acquisition module includes a fifth resistor, a sixth resistor, a seventh resistor, a first crystal, a first diode, a second diode, and a first transformer; The fifth resistor is connected to the first transformer, and the two ends of the parallel connection between the first crystal and the sixth resistor are connected to the first transformer. One end of the first diode and the second diode connected in parallel is connected to the seventh resistor, and the other end is connected to the sixth resistor. The other end of the seventh resistor is connected to the other end of the sixth resistor.

7. An ultrasonic spill prevention sensor according to claim 6, characterized in that, The second acquisition module includes an eighth resistor, a ninth resistor, a tenth resistor, a second crystal, a third diode, a fourth diode, and a second transformer; The eighth resistor is connected to the second transformer, and the two ends of the parallel connection between the second crystal and the ninth resistor are connected to the second transformer. One end of the third and fourth diodes connected in parallel is connected to the tenth resistor, and the other end is connected to the ninth resistor. The other end of the seventh resistor is connected to the other end of the sixth resistor.

8. An ultrasonic spill prevention sensor according to claim 7, characterized in that, The receiving transducer includes a first electronic switch, a second electronic switch, a first capacitor, and a second capacitor. The first acquisition module is connected to the first capacitor, and the other end of the first capacitor is connected to the first electronic switch. The second acquisition module is connected to the second capacitor, and the other end of the second capacitor is connected to the second electronic switch. One end of the first electronic switch and the second electronic switch is simultaneously connected to the first-stage operational amplifier module.

9. An ultrasonic spill prevention sensor according to claim 8, characterized in that, The first-stage operational amplifier module includes an eleventh resistor, a twelfth resistor, a thirteenth resistor, a third capacitor, a fourth capacitor, and a first operational amplifier unit; The eleventh resistor is connected to the third capacitor and the fourth capacitor. The other end of the third capacitor is connected to the thirteenth resistor and the first operational amplifier unit, respectively. The other end of the fourth capacitor is connected to the thirteenth resistor and the second operational amplifier module, respectively. The twelfth resistor is connected to the first operational amplifier unit.

10. An ultrasonic spill prevention sensor according to claim 9, characterized in that, The secondary operational amplifier module includes a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a fifth capacitor, a sixth capacitor, and a second operational amplifier unit; One end of the fourteenth resistor and the fifteenth resistor are connected to one end of the fifth capacitor and the sixth capacitor, respectively, and the other end of the fourteenth resistor is connected to the thirteenth resistor, the first operational amplifier unit and the fourth capacitor. The other end of the fifth capacitor is connected to the sixteenth resistor and the second operational amplifier unit, respectively, and the other end of the sixteenth resistor is connected to the second operational amplifier unit and the sixth capacitor.

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