Three-stage amplification detection circuit of ultrasonic liquid level sensor

By designing a three-stage amplification detection circuit for ultrasonic liquid level sensors, combining capacitors, resistors, electrodes and amplifiers, three-stage amplification of electrical signals is achieved, solving the problem of low detection accuracy caused by single-stage amplification, and improving the accuracy of liquid level detection.

CN223122306UActive Publication Date: 2025-07-18XIAMEN WOODY ELECTRONIC TECH CO LTD
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Patent Information

Application Number
CN202422421709.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-08
Publication Date
2025-07-18
Estimated Expiration
2034-10-08

AI Technical Summary

Technical Problem

The amplification detection circuit of existing ultrasonic liquid level sensors is usually single-stage amplification, resulting in low accuracy in liquid level detection.

Method used

A three-stage amplification detection circuit is adopted, including a combination of a detection circuit, a first-stage amplification circuit, a second-stage amplification circuit and a three-stage amplification circuit. Through the connection of capacitors, resistors and diodes, combined with amplifiers and transistors, the three-stage amplification of electrical signals is realized.

Benefits of technology

The liquid level detection accuracy of the ultrasonic liquid level sensor is improved and the accurate detection of the liquid level is achieved.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a three-stage amplification detection circuit of an ultrasonic liquid level sensor, which comprises a detection circuit, the detection circuit is electrically connected with a first-stage amplification circuit, the first-stage amplification circuit is electrically connected with a second-stage amplification circuit, and the second-stage amplification circuit is electrically connected with a third-stage amplification circuit; the detection circuit comprises a capacitor C1, one end of the capacitor C1 is electrically connected with one end of a resistor R1, the other end of the resistor R1 is electrically connected with one end of a capacitor C2, a negative electrode of a diode D1 and a positive electrode of a diode D2, the positive electrode of the diode D1 and the negative electrode of the diode D2 are grounded, and the other end of the capacitor C2 is electrically connected with one end of a resistor R2. According to the ultrasonic liquid level sensor, through cooperation of the detection circuit, the first-stage amplification circuit, the second-stage amplification circuit and the third-stage amplification circuit, three-stage amplification of an electric signal can be achieved, and therefore the ultrasonic liquid level sensor can accurately detect the liquid level, and the detection accuracy is improved.
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Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic liquid level sensors, in particular to a three-stage amplification and detection circuit of an ultrasonic liquid level sensor. Background Art

[0002] The ultrasonic liquid level sensor can be directly installed outside a liquid container, such as at the bottom, and there is no need to drill holes or perform other operations at the installation position of the liquid container. Therefore, it is more and more widely used. When the ultrasonic liquid level sensor works, it is necessary to amplify and detect signals. Therefore, a corresponding amplification and detection circuit is required. However, the existing amplification and detection circuit is usually single-stage amplification, resulting in low accuracy when the ultrasonic liquid level sensor detects the liquid level. In order to improve the accuracy of the ultrasonic liquid level sensor during detection, we propose a three-stage amplification and detection circuit of an ultrasonic liquid level sensor. Content of the Utility Model

[0003] The purpose of the utility model is to solve the disadvantages existing in the prior art, and to propose a three-stage amplification and detection circuit of an ultrasonic liquid level sensor.

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A three-stage amplification and detection circuit of an ultrasonic liquid level sensor includes a detection circuit. The detection circuit is electrically connected to a first-stage amplification circuit, the first-stage amplification circuit is electrically connected to a second-stage amplification circuit, and the second-stage amplification circuit is electrically connected to a third-stage amplification circuit;

[0006] The detection circuit includes a capacitor C1. One end of the capacitor C1 is electrically connected to one end of a resistor R1. The other end of the resistor R1 is electrically connected to one end of a capacitor C2, the negative electrode of a diode D1, and the positive electrode of a diode D2. The positive electrode of the diode D1 and the negative electrode of the diode D2 are both grounded. The other end of the capacitor C2 is electrically connected to one end of a resistor R2. The other end of the resistor R2 is electrically connected to one end of a resistor R3. The other end of the resistor R3 is electrically connected to one end of a resistor R4, one end of a resistor R5, and one end of a capacitor C3. The other end of the capacitor C3 is electrically connected to the other end of the resistor R5, and the other end of the resistor R5 is grounded.

[0007] Preferably, the first-stage amplification circuit includes an amplifier U1. The pin 2 of the amplifier U1 is electrically connected to the other end of a resistor R2 and one end of a resistor R3. The pin 3 of the amplifier U1 is electrically connected to one end of a resistor R6 and one end of a resistor R7. The other end of the resistor R6 is electrically connected to one end of a capacitor C4, and the other end of the capacitor C4 is grounded. The pin 5 of the amplifier U1 is electrically connected to one end of a resistor R9. The other end of the resistor R7 is electrically connected to the other end of the resistor R9. The pin 4 of the amplifier U1 is grounded. The pin 1 of the amplifier U1 is electrically connected to one end of a capacitor C5, one end of a capacitor C10, and one end of a resistor R8. The other ends of the capacitor C5 and the capacitor C10 are both grounded.

[0008] Preferably, the second-stage amplification circuit includes an amplifier U2. The pin 2 of the amplifier U2 is electrically connected to the other end of the resistor R9. The pin 2 of the amplifier U2 is electrically connected to one end of a resistor R10. The pin 3 of the amplifier U2 is electrically connected to one end of a resistor R11, one end of a resistor R12, and one end of a capacitor C7. The other end of the resistor R11 is electrically connected to one end of a capacitor C6, and the other end of the capacitor C6 is grounded. The pin 5 of the amplifier U2 is electrically connected to one end of the resistor R11, and the other end of the resistor R11 is electrically connected to the other end of the capacitor C7.

[0009] Preferably, the third-stage amplification circuit includes a capacitor C51. One end of the capacitor C51 is electrically connected to the other end of a resistor R12. The other end of the capacitor C51 is electrically connected to one end of a resistor R74, one end of a resistor R73, and the base of a triode Q9. The other ends of the resistor R73 and the emitter of the triode Q9 are both grounded. The collector of the triode Q9 is electrically connected to one end of a capacitor C52 and one end of a resistor R75. The other end of the resistor R74 is electrically connected to the collector of the triode Q9. The other end of the resistor R75 is electrically connected to one end of a capacitor C53, one end of a resistor R76, and one end of a capacitor C54. The other ends of the capacitor C53 and the capacitor C54 are both grounded.

[0010] Preferably, the models of both the amplifier U1 and the amplifier U2 are ADA4581-2.

[0011] Preferably, the models of both the diode D1 and the diode D2 are LL4148.

[0012] Compared with the existing technology, the beneficial effects of the present utility model are as follows:

[0013] Through the cooperation of the detection circuit, the first-stage amplification circuit, the second-stage amplification circuit and the third-stage amplification circuit, the present utility model can achieve three-stage amplification of the electrical signal, so that the ultrasonic liquid level sensor can accurately detect the liquid level and improve the detection accuracy. Description of the Drawings

[0014] Figure 1 The connection block diagram of a three - stage amplification and detection circuit for an ultrasonic liquid level sensor proposed by the present utility model;

[0015] Figure 2 The circuit diagram of the detection circuit, the first - stage amplification circuit, and the second - stage amplification circuit of a three - stage amplification and detection circuit for an ultrasonic liquid level sensor proposed by the present utility model;

[0016] Figure 3 The circuit diagram of the three - stage amplification circuit of a three - stage amplification and detection circuit for an ultrasonic liquid level sensor proposed by the present utility model. Specific embodiments

[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0018] Refer to Figures 1 - 3 , a three - stage amplification and detection circuit for an ultrasonic liquid level sensor, including a detection circuit. The detection circuit is electrically connected to a first - stage amplification circuit. The first - stage amplification circuit is electrically connected to a second - stage amplification circuit. The second - stage amplification circuit is electrically connected to a third - stage amplification circuit;

[0019] The detection circuit includes a capacitor C1. One end of the capacitor C1 is electrically connected to one end of a resistor R1. The other end of the resistor R1 is electrically connected to one end of a capacitor C2, the negative electrode of a diode D1, and the positive electrode of a diode D2. The positive electrode of the diode D1 and the negative electrode of the diode D2 are both grounded. The other end of the capacitor C2 is electrically connected to one end of a resistor R2. The other end of the resistor R2 is electrically connected to one end of a resistor R3. The other end of the resistor R3 is electrically connected to one end of a resistor R4, one end of a resistor R5, and one end of a capacitor C3. The other end of the capacitor C3 is electrically connected to the other end of the resistor R5. The other end of the resistor R5 is grounded. The models of the diodes D1 and D2 are both LL4148;

[0020] The first - stage amplification circuit includes an amplifier U1. The pin 2 of the amplifier U1 is electrically connected to the other end of the resistor R2 and one end of the resistor R3. The pin 3 of the amplifier U1 is electrically connected to one end of a resistor R6 and one end of a resistor R7. The other end of the resistor R6 is electrically connected to one end of a capacitor C4. The other end of the capacitor C4 is grounded. The pin 5 of the amplifier U1 is electrically connected to one end of a resistor R9. The other end of the resistor R7 is electrically connected to the other end of the resistor R9. The pin 4 of the amplifier U1 is grounded. The pin 1 of the amplifier U1 is electrically connected to one end of a capacitor C5, one end of a capacitor C10, and one end of a resistor R8. The other ends of the capacitor C5 and the capacitor C10 are both grounded;

[0021] The second-stage amplifier circuit includes an amplifier U2. The pin 2 of the amplifier U2 is electrically connected to the other end of a resistor R9. One end of a resistor R10 is electrically connected to the pin 2 of the amplifier U2. One end of a resistor R11, one end of a resistor R12, and one end of a capacitor C7 are electrically connected to the pin 3 of the amplifier U2. One end of a capacitor C6 is electrically connected to the other end of the resistor R11. The other end of the capacitor C6 is grounded. One end of the resistor R11 is electrically connected to the pin 5 of the amplifier U2. The other end of the resistor R11 is electrically connected to the other end of the capacitor C7. The models of both the amplifier U1 and the amplifier U2 are ADA4581-2;

[0022] The third-stage amplifier circuit includes a capacitor C51. One end of the capacitor C51 is electrically connected to the other end of the resistor R12. The other end of the capacitor C51 is electrically connected to one end of a resistor R74, one end of a resistor R73, and the base of a triode Q9. The other end of the resistor R73 and the emitter of the triode Q9 are both grounded. The collector of the triode Q9 is electrically connected to one end of a capacitor C52 and one end of a resistor R75. The other end of the resistor R74 is electrically connected to the collector of the triode Q9. The other end of the resistor R75 is electrically connected to one end of a capacitor C53, one end of a resistor R76, and one end of a capacitor C54. The other ends of the capacitor C53 and the capacitor C54 are both grounded; Through the cooperation of the detection circuit, the first-stage amplifier circuit, the second-stage amplifier circuit, and the third-stage amplifier circuit, the present invention can achieve three-stage amplification of the electrical signal, so that the ultrasonic liquid level sensor can accurately detect the liquid level and improve the detection accuracy.

[0023] Working principle: When in use, the input electrical signal is rectified by the detection circuit to convert its AC signal into a DC signal. The rectified signal sequentially passes through the amplifier U1 of the first-stage amplifier circuit, the amplifier U2 of the second-stage amplifier circuit, and the triode Q9 of the third-stage amplifier circuit. The DC signal is sequentially amplified by the amplifier U1, the amplifier U2, and the triode Q9 to achieve three-stage amplification of the electrical signal. By means of three-stage amplified electrical signals, the ultrasonic liquid level sensor can accurately receive the electrical signal, so as to accurately detect the liquid level and improve the monitoring accuracy.

[0024] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A three-stage amplification and detection circuit for an ultrasonic liquid level sensor, including a detection circuit, characterized in that, The detection circuit is electrically connected to a first-stage amplifier circuit, the first-stage amplifier circuit is electrically connected to a second-stage amplifier circuit, and the second-stage amplifier circuit is electrically connected to a third-stage amplifier circuit; The detection circuit includes a capacitor C1. One end of the capacitor C1 is electrically connected to one end of a resistor R1. The other end of the resistor R1 is electrically connected to one end of a capacitor C2, the negative electrode of a diode D1, and the positive electrode of a diode D2. The positive electrode of the diode D1 and the negative electrode of the diode D2 are both grounded. The other end of the capacitor C2 is electrically connected to one end of a resistor R2. The other end of the resistor R2 is electrically connected to one end of a resistor R3. The other end of the resistor R3 is electrically connected to one end of a resistor R4, one end of a resistor R5, and one end of a capacitor C3. The other end of the capacitor C3 is electrically connected to the other end of the resistor R5, and the other end of the resistor R5 is grounded.

2. The three-stage amplification and detection circuit of an ultrasonic liquid level sensor according to claim 1, characterized in that, The first-stage amplifier circuit includes an amplifier U1. The pin 2 of the amplifier U1 is electrically connected to the other end of the resistor R2 and one end of the resistor R3. The pin 3 of the amplifier U1 is electrically connected to one end of a resistor R6 and one end of a resistor R7. The other end of the resistor R6 is electrically connected to one end of a capacitor C4, and the other end of the capacitor C4 is grounded. The pin 5 of the amplifier U1 is electrically connected to one end of a resistor R9. The other end of the resistor R7 is electrically connected to the other end of the resistor R9. The pin 4 of the amplifier U1 is grounded. The pin 1 of the amplifier U1 is electrically connected to one end of a capacitor C5, one end of a capacitor C10, and one end of a resistor R8. The other ends of the capacitor C5 and the capacitor C10 are both grounded.

3. The three-stage amplification and detection circuit of an ultrasonic liquid level sensor according to claim 2, characterized in that, The second-stage amplifier circuit includes an amplifier U2. The pin 2 of the amplifier U2 is electrically connected to the other end of the resistor R9. The pin 2 of the amplifier U2 is electrically connected to one end of a resistor R10. The pin 3 of the amplifier U2 is electrically connected to one end of a resistor R11, one end of a resistor R12, and one end of a capacitor C7. The other end of the resistor R11 is electrically connected to one end of a capacitor C6, and the other end of the capacitor C6 is grounded. The pin 5 of the amplifier U2 is electrically connected to one end of the resistor R11, and the other end of the resistor R11 is electrically connected to the other end of the capacitor C7.

4. The three-stage amplification and detection circuit of an ultrasonic liquid level sensor according to claim 3, characterized in that, The third-stage amplifier circuit includes a capacitor C51. One end of the capacitor C51 is electrically connected to the other end of the resistor R12. The other end of the capacitor C51 is electrically connected to one end of a resistor R74, one end of a resistor R73, and the base of a triode Q9. The other end of the resistor R73 and the emitter of the triode Q9 are both grounded. The collector of the triode Q9 is electrically connected to one end of a capacitor C52 and one end of a resistor R75. The other end of the resistor R74 is electrically connected to the collector of the triode Q9. The other end of the resistor R75 is electrically connected to one end of a capacitor C53, one end of a resistor R76, and one end of a capacitor C54. The other ends of the capacitor C53 and the capacitor C54 are both grounded.

5. The three-stage amplification and detection circuit of an ultrasonic liquid level sensor according to claim 3, characterized in that, The models of the amplifiers U1 and U2 are both ADA4581-2.

6. The three-stage amplification and detection circuit of an ultrasonic liquid level sensor according to claim 1, characterized in that, The models of the diodes D1 and D2 are both LL4148.