CN219372412U

CN219372412U - Ultrasonic wave proximity switch based on PMUT

Info

Publication number: CN219372412U
Application number: CN202320555948.8U
Authority: CN
Inventors: 谢贵旺; 伍秀丽
Original assignee: Guangzhou Hummingbird Sensor Technology Co ltd
Current assignee: Guangzhou Hummingbird Sensor Technology Co ltd
Priority date: 2023-03-20
Filing date: 2023-03-20
Publication date: 2023-07-18
Anticipated expiration: 2033-03-20

Abstract

The utility model provides an ultrasonic proximity switch based on PMUT, which comprises: a control unit; the high-voltage driving module is electrically connected with the control unit; the ultrasonic sensor is electrically connected with the high-voltage driving module and is used for transmitting and receiving ultrasonic signals; the detection module is electrically connected with the control unit and the ultrasonic sensor; wherein the field of view of the ultrasonic sensor is 170-180 degrees. The utility model provides an ultrasonic proximity switch based on PMUT, which can realize the effect of the existing three ultrasonic sensor architectures by a single ultrasonic sensor, reduces the cost and simplifies the installation complexity.

Description

Ultrasonic wave proximity switch based on PMUT

Technical Field

The utility model relates to the technical field of proximity switches, in particular to an ultrasonic proximity switch based on PMUT.

Background

The ultrasonic proximity switch is a sensor for detecting objects at a distance and then performing corresponding actions, can detect objects with a certain volume within a set range, has small error and high precision, and is widely applied to various automatic products. The field of view scope of the ultrasonic sensor of the current ultrasonic proximity switch is small, the size is large, and a large-scale field of view can be realized only by a plurality of ultrasonic sensors, so that the cost is high, the installation is complex, and the system volume is large.

Disclosure of Invention

The utility model aims to overcome the problems in the prior art and provide the ultrasonic proximity switch based on the PMUT, which realizes a wide field of view by a single ultrasonic sensor, and has the advantages of low cost, simple installation and small system volume.

In order to achieve the technical purpose and the technical effect, the utility model is realized by the following technical scheme:

the utility model provides an ultrasonic proximity switch based on PMUT, which comprises:

a control unit;

the high-voltage driving module is electrically connected with the control unit;

the ultrasonic sensor is electrically connected with the high-voltage driving module and is used for transmitting and receiving ultrasonic signals; and

the detection module is electrically connected with the control unit and the ultrasonic sensor;

wherein the field of view of the ultrasonic sensor is 170-180 degrees.

In one embodiment of the utility model, the detection module comprises:

the first-stage amplifying module is electrically connected with the ultrasonic sensor;

the filtering module is electrically connected with the first-stage amplifying module; and

the second-stage amplifying module is electrically connected with the filtering module.

In an embodiment of the utility model, the detection module further includes a detection module, and the detection module is electrically connected to the second-stage amplification module and the control unit.

In one embodiment of the present utility model, the ultrasonic proximity switch further includes a connector module electrically connected to the high voltage driving module and the first stage amplifying module for connecting the ultrasonic sensor.

In one embodiment of the present utility model, the ultrasonic sensor is a transceiver-integrated PMUT.

In summary, the utility model provides the ultrasonic proximity switch based on the PMUT, which adopts the ultrasonic sensor with the field of view of 170-180 degrees, so that the effect of the existing three ultrasonic sensor architectures can be realized by a single ultrasonic sensor, the cost is reduced, the installation complexity is simplified, and the system volume is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:

FIG. 1 is a block diagram of the overall structure of an ultrasonic proximity switch of the present utility model;

FIG. 2 is a circuit diagram of a connector module of the present utility model;

FIG. 3 is a circuit diagram of a first stage amplification module of the present utility model;

FIG. 4 is a circuit diagram of a filter module of the present utility model;

FIG. 5 is a circuit diagram of a second stage amplification module of the present utility model;

FIG. 6 is a circuit diagram of a detection module of the present utility model;

fig. 7 is a circuit diagram of a control unit of the present utility model.

Detailed Description

The utility model will be described in detail below with reference to the drawings in combination with embodiments.

Referring to fig. 1, the utility model provides an ultrasonic proximity switch based on PMUT, which adopts an ultrasonic sensor with a field of view of 170-180 degrees, and can realize the effect of the existing three ultrasonic sensor architectures with a single ultrasonic sensor, thereby reducing the cost and simplifying the installation complexity. Specifically, the ultrasonic proximity switch comprises a control unit, a high-voltage driving module and an ultrasonic sensor. The high-voltage driving module is electrically connected to the control unit. The ultrasonic sensor is electrically connected to the high-voltage driving module and is used for transmitting and receiving ultrasonic signals. The field of view of the ultrasonic sensor is a receiving and transmitting integrated PMUT, so that spontaneous and self-receiving can be realized, and the frequency of the PMUT is 100K. The field of view of the ultrasonic sensor is 170-180 °, for example, 173 °, 175 °, or 178 °, but is not limited thereto. The field of view of the ultrasonic sensor is close to 180 degrees, and the radiation range of three ultrasonic sensors can be realized by a single ultrasonic sensor.

Referring to fig. 1, in an embodiment of the utility model, the ultrasonic proximity switch further includes a detection module electrically connected to the control unit and the ultrasonic sensor. Specifically, the detection module comprises a first-stage amplification module, a filtering module and a second-stage amplification module. The first-stage amplifying module is electrically connected to the ultrasonic sensor. As shown in fig. 3 and 4, the first stage amplification module is connected with the ultrasonic sensor through pin No. 3 of the operational amplifier U1. The filtering module is electrically connected to the first stage amplifying module. As shown in fig. 2 and 4, the filtering module is connected to pin 1 of the operational amplifier U1 of the first amplifying module through a resistor R8. The second-stage amplifying module is electrically connected to the filtering module. As shown in fig. 4 and 5, the second stage amplifying module is connected to the capacitor C7 through pin No. 5 of the operational amplifier U2. In an embodiment of the utility model, the detection module further includes a detection module, and the detection module is electrically connected to the second-stage amplification module and the control unit. As shown in fig. 5, 6 and 7, the detection module is connected to pin 7 of the operational amplifier U2 of the second-stage amplification module through a diode D1, and the detection module is connected to pin 7 of the control unit through a resistor R14. And the echo received by the ultrasonic sensor is processed by the first-stage amplifying module, the filtering module, the second-stage amplifying module and the detection module to obtain the pulse width of the echo and the amplitude of the echo.

Referring to fig. 1, in an embodiment of the utility model, the ultrasonic proximity switch further includes a connector module electrically connected to the high-voltage driving module and the first-stage amplifying module for connecting to the ultrasonic sensor. As shown in fig. 2 and 4, the connector module is connected to pin 3 of the operational amplifier U1 of the first amplifying module through a resistor R2, and the connector module is connected to the ultrasonic sensor through a connector H1.

In summary, the utility model provides an ultrasonic proximity switch based on PMUT, the ultrasonic proximity switch drives an ultrasonic sensor to transmit an ultrasonic signal through a high-voltage driving module, an echo after the ultrasonic signal encounters an object and is processed by a detection module to obtain a pulse width of the echo and an amplitude of the echo, whether the object exists or not is judged according to the pulse width of the echo and the amplitude of the echo, if the object exists, the ultrasonic proximity switch is opened, otherwise, the ultrasonic proximity switch is closed, specifically, if the pulse width of the echo is in a range of 100-2000us, and the amplitude of the echo is greater than two thirds of the background noise, the object exists, the ultrasonic proximity switch is opened, the judgment is accurate, wherein the background noise value is fixed for a designed circuit, and an ultrasonic sensor with a field of view of 170-180 degrees is adopted, and the effect of the existing three ultrasonic sensor structures can be realized by a single ultrasonic sensor, so that the cost is reduced, the installation complexity is simplified, and the system volume is reduced.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims.

Claims

1. An ultrasonic proximity switch based on PMUT, wherein the ultrasonic proximity switch comprises:

a control unit;

wherein the field of view of the ultrasonic sensor is 170-180 degrees.

2. The ultrasonic proximity switch of claim 1, wherein the detection module comprises:

3. The ultrasonic proximity switch according to claim 2, wherein the detection module further comprises a detection module electrically connected to the second stage amplification module and the control unit.

4. The ultrasonic proximity switch of claim 2, further comprising a connector module electrically connected to the high voltage drive module and the first stage amplification module for connecting the ultrasonic sensor.

5. The ultrasonic proximity switch of claim 1, wherein the ultrasonic sensor is a transceiver-integrated PMUT.