Adjustable pressure sensor device, electronic scale and pressure alarm device

Abstract

The utility model discloses an adjustable pressure sensor device, an electronic scale and a pressure alarm device. The adjustable pressure sensor device comprises a control chip, a pressure sensor, a first adjustable resistor, a second adjustable resistor and a resistor. The control chip internally comprises a differential amplification circuit; one end of a circuit formed by connecting the pressure sensor and the first adjustable resistor in parallel is connected with one end of the resistor, and the other end of the circuit is connected with one end of the second adjustable resistor; and the other end of the resistor and the other end of the second adjustable resistor are respectively connected with the input end of a differential amplification circuit in the control chip. The circuit provided by the utility model is simple in structure, and can be suitable for various application scenes.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors and electronic measurement, and particularly to an adjustable pressure sensor device, an electronic scale, and a pressure alarm device, and particularly to an adjustable pressure sensor device. Background Art

[0002] MEMS (Micro Electromechanical System) is increasingly used, and one of the leading products in the market is MEMS pressure sensor.

[0003] Existing pressure sensors come in a variety of forms, including capacitive, piezoelectric, magnetoelectric, and fiber optic. Silicon piezoresistive and silicon capacitive pressure sensors are the most suitable for miniaturized MEMS applications. However, these sensors, manufactured using semiconductor technology, lack adjustable measurement ranges, limiting their application.

[0004] In order to make MEMS pressure sensor products suitable for more occasions, it is necessary to propose an application circuit design with simple structure and low cost. Utility Model Content

[0005] In order to solve the above problems, the utility model provides an adjustable pressure sensor device, an electronic scale and a pressure alarm device, and designs an application circuit of a MEMS pressure sensor so that the application circuit can be flexibly applied to various application occasions.

[0006] In a first aspect, an embodiment of the present invention provides an adjustable pressure sensor device, comprising:

[0007] Control chip, pressure sensor, first adjustable resistor, second adjustable resistor, resistor;

[0008] The control chip includes a differential amplifier circuit;

[0009] A circuit in which the pressure sensor and the first adjustable resistor are connected in parallel has one end connected to one end of the resistor and the other end connected to one end of the second adjustable resistor;

[0010] The other end of the resistor and the other end of the second adjustable resistor are respectively connected to the input end of the differential amplifier circuit inside the control chip.

[0011] As a priority measure,

[0012] The first adjustable resistor, the second adjustable resistor, and the resistor form a voltage divider circuit.

[0013] As a priority measure,

[0014] The maximum value of the second adjustable resistor is smaller than the maximum value of the first adjustable resistor.

[0015] As a priority measure,

[0016] The adjustable pressure sensor device further includes a capacitor; the capacitor is connected in parallel with the resistor to form a filter circuit.

[0017] As a priority measure,

[0018] The pressure sensor is a silicon capacitive pressure sensor.

[0019] As a priority measure,

[0020] The control chip also includes an operating circuit and a storage medium, which can be written with a program to calculate the pressure value applied to the pressure sensor based on the signal input generated by the pressure sensor and the first adjustable resistor, the second adjustable resistor, and the resistor.

[0021] On the other hand, an embodiment of the present invention provides an electronic scale, comprising any one of the above-mentioned adjustable pressure sensor devices:

[0022] The control chip is connected to the display via a display interface;

[0023] Adjusting the first adjustable resistor and the second adjustable resistor respectively according to the measurement range and measurement accuracy of the electronic scale;

[0024] The control chip converts the calculated pressure value into a weight value, and transmits it to the display through the display interface for display.

[0025] On the other hand, an embodiment of the present invention provides a pressure alarm device, comprising any one of the above-mentioned adjustable pressure sensor devices:

[0026] The control chip is connected to the alarm via a drive interface;

[0027] adjusting the first adjustable resistor and the second adjustable resistor respectively according to the measurement range and measurement accuracy of the pressure alarm device;

[0028] The control chip compares the calculated pressure value with a set threshold value. When the pressure value exceeds the threshold value, the control chip triggers the alarm through the drive interface to sound an alarm.

[0029] The beneficial effects of the above technical solution provided by the embodiment of the present utility model include at least:

[0030] 1. Through circuit design, the measurement range and measurement accuracy of the pressure alarm device (pressure sensor) can be adjusted to meet the needs of different application scenarios.

[0031] 2. The circuit structure is simple, easy to implement and low cost.

[0032] 3. It is conducive to the production of MEMS.

[0033] Other features and advantages of the present invention will be described in the following description or understood through implementation of the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the structures specifically pointed out in the written description, claims, and drawings.

[0034] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 This is a circuit diagram of an adjustable pressure sensor device in an embodiment of the present utility model;

[0037] Figure 2 This is a circuit diagram of Application Example 1 of the present utility model;

[0038] Figure 3 This is the circuit principle diagram of the second application example of the present utility model. DETAILED DESCRIPTION

[0039] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0040] The present invention provides an adjustable pressure sensor device. Figure 1 As shown, it includes: a control chip U1, a pressure sensor PZ, a first adjustable resistor RP1, a second adjustable resistor RP2, a resistor R and a capacitor C.

[0041] The control chip U1 includes a differential amplifier circuit.

[0042] The circuit formed by connecting the pressure sensor PZ and the first adjustable resistor RP1 in parallel has one end connected to one end of the resistor R and the other end connected to one end of the second adjustable resistor RP2.

[0043] The other end of the resistor R and the other end of the second adjustable resistor RP2 are respectively connected to the input end of the differential amplifier circuit inside the control chip U1.

[0044] In this embodiment, a first adjustable resistor RP1, a second adjustable resistor RP2, and a resistor R form a voltage divider circuit. The first adjustable resistor RP1 and the second adjustable resistor RP2 are used to control the output range of the chip U1. As a preferred implementation, the maximum value of the second adjustable resistor RP2 is less than the maximum value of the first adjustable resistor RP1. For example, the maximum value of the second adjustable resistor RP2 is lower than the maximum value of the first adjustable resistor RP1 by at least an order of magnitude of 10, thereby controlling the output accuracy of the chip U1.

[0045] Capacitor C and resistor R are connected in parallel to form an RC filter circuit, which is used to buffer the spike pulse generated when the pressure sensor PZ is actuated.

[0046] In this embodiment, the pressure sensor PZ is preferably a silicon capacitive pressure sensor ( Figure 1 ), which is beneficial for the adjustable pressure sensor device of this embodiment to be made into MEMS.

[0047] In this embodiment, the control chip U1 also has an internal computing circuit and storage medium, which can be written with a program to calculate the pressure value based on the signal input generated by the pressure sensor PZ and the first adjustable resistor RP1, the second adjustable resistor RP2, the resistor R, and the capacitor C. The control chip U1 is preferably a single-chip microcomputer such as the 8051 series, or other chips with differential, computing, and memory.

[0048] The utility model provides an adjustable pressure sensor device, which can adjust the first adjustable resistor RP1 and the second adjustable resistor RP2 according to different requirements to adapt to different application scenarios.

[0049] Example 1

[0050] Used in electronic scales. Adjust the first and second adjustable resistors RP1 and RP2 based on the measurement range and accuracy. The control chip U1 converts the calculated pressure value into a weight value and transmits it to an external monitor via a display interface for display.

[0051] Example 2

[0052] Used in pressure alarm devices, such as fences. Adjust the first and second adjustable resistors RP1 and RP2 based on the measurement range and accuracy. Control chip U1 compares the calculated pressure value with a set threshold. If the pressure exceeds the threshold, it triggers an external alarm through the driver interface.

[0053] For example, the adjustable pressure sensor device of the present invention is configured to have a set pressure detection range. A trigger threshold is set via a program written into a control chip. The adjustable pressure sensor device is then installed or positioned at the base of a fence post. If a person or animal exceeding a certain weight (threshold pressure) climbs over the fence, the control chip triggers an alarm, such as an audible or visual warning signal.

[0054] In the present invention, the aforementioned pressure value calculation, weight value conversion, threshold comparison, etc. are all common technical knowledge in this field and can be achieved by writing an execution program into the EPROM, so they will not be described in detail here.

[0055] Any modifications, supplements and equivalent replacements made within the scope of the principles of this utility model shall still fall within the scope of the patent coverage of this utility model.

[0056] Unless otherwise stated, the term "connected" refers to a logical relationship for current transmission and does not necessarily indicate a direct electrical connection. Furthermore, the terms "first," "second," etc. do not indicate a sequential order but are merely used to identify related units, devices, etc.

Claims

1. An adjustable pressure sensor device, characterized in that include: Control chip, pressure sensor, first adjustable resistor, second adjustable resistor, resistor; The control chip includes a differential amplifier circuit; A circuit in which the pressure sensor and the first adjustable resistor are connected in parallel has one end connected to one end of the resistor and the other end connected to one end of the second adjustable resistor; The other end of the resistor and the other end of the second adjustable resistor are respectively connected to the input end of the differential amplifier circuit inside the control chip.

2. The adjustable pressure sensor device according to claim 1, wherein The first adjustable resistor, the second adjustable resistor, and the resistor form a voltage divider circuit.

3. The adjustable pressure sensor device according to claim 1, wherein The maximum value of the second adjustable resistor is smaller than the maximum value of the first adjustable resistor.

4. The adjustable pressure sensor device according to claim 1, wherein The adjustable pressure sensor device further includes a capacitor; The capacitor and the resistor are connected in parallel to form a filter circuit.

5. The adjustable pressure sensor device according to claim 1, wherein The pressure sensor is a silicon capacitive pressure sensor.

6. The adjustable pressure sensor device according to any one of claims 1 to 5, characterized in that: The control chip also includes an operating circuit and a storage medium capable of writing programs; The control chip calculates the pressure value applied to the pressure sensor according to the signal input generated by the pressure sensor and the first adjustable resistor, the second adjustable resistor, and the resistor.

7. An electronic scale comprising the adjustable pressure sensor device according to claim 6, characterized in that: The control chip is connected to the display via a display interface; Adjusting the first adjustable resistor and the second adjustable resistor respectively according to the measurement range and measurement accuracy of the electronic scale; The control chip converts the calculated pressure value into a weight value, and transmits it to the display through the display interface for display.

8. A pressure alarm device, comprising the adjustable pressure sensor device according to claim 6, characterized in that: The control chip is connected to the alarm via a drive interface; adjusting the first adjustable resistor and the second adjustable resistor respectively according to the measurement range and measurement accuracy of the pressure alarm device; The control chip compares the calculated pressure value with a set threshold value. When the pressure value exceeds the threshold value, the control chip triggers the alarm through the drive interface to sound an alarm.

Images