A magnetic sensor device, measurement method

Abstract

The application provides a magnetic sensor device and a measuring method. The magnetic sensor device is composed of a magnetic field collecting device and a signal processing device. The magnetic field collecting device contains at least one set of magnetic field collecting units for collecting the magnetic field intensity in one direction. The signal processing device is used for processing the voltage signal output by the magnetic field collecting device and outputting the magnetic field intensity after processing. The magnetic sensor has simple structure, low cost and high sensitivity.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic detection, specifically to a magnetic sensor and circuit. Background Technology

[0002] Currently, in the field of magnetic field strength measurement sensors, dedicated processing chip kits are typically required to achieve high-precision measurements. While this approach meets the requirements, its drawbacks include high chip costs and uncontrollable chip failures, which increase the system failure rate. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing high-precision magnetic field technology solutions and, while achieving the same reading accuracy, to provide a magnetic field strength measurement circuit and method that uses general-purpose components and has a simple and maintainable circuit structure.

[0004] To achieve the above objectives, the present invention provides a magnetic sensor device comprising a magnetic field acquisition device, a signal processing device, and a control and calculation module. The magnetic field acquisition device includes at least one set of magnetic field acquisition units, each set consisting of a first magnetic inductor, a first resistor, a second resistor, a first AND gate controller, a second AND gate controller, a first analog selector, and a second analog selector. The input terminal of the first magnetic inductor is connected to the first terminal of the first resistor and the input terminal of the first analog selector; the output terminal of the first magnetic inductor is connected to the first terminal of the second resistor and the input terminal of the second analog selector; the second terminal of the first resistor is connected to the output terminal of the first AND gate controller; the second terminal of the second resistor is connected to the output terminal of the second AND gate controller; the direction from the input terminal to the output terminal of the first magnetic inductor is the direction of the measured magnetic field. The signal processing device comprises an operational amplifier, resistors R103, R104, and R105; the negative input terminal of the operational amplifier is connected to the output of the first analog selector. The control calculation module includes a first output control terminal, a second output control terminal, and an input terminal IN1. The output terminal of the operational amplifier is connected to the first input terminal of the first AND gate controller and the first input terminal of the second AND gate controller. The first terminal of resistor R104 is grounded, and the second terminal of resistor R104 is connected to the positive input terminal of the operational amplifier. The first terminal of resistor R103 is connected to the positive terminal of the power supply, and the second terminal of resistor R103 is connected to the positive input terminal of the operational amplifier and the second terminal of resistor R104. The first terminal of resistor R105 is connected to the output terminal of the operational amplifier, and the second terminal of resistor R105 is connected to the second terminal of resistor R104. The control calculation module includes a first output control terminal, a second output control terminal, and an input terminal IN1. The first output control terminal of the control calculation module is connected to the second input terminal of the first AND gate controller and the control terminal of the second analog gate controller. The second output control terminal of the control calculation module is connected to the second input terminal of the second AND gate controller and the control terminal of the first analog gate controller. The input terminal IN1 of the control calculation module is connected to the output terminal of the operational amplifier.

[0005] Optionally, the first resistor and the second resistor of the magnetic field acquisition unit have the same resistance value.

[0006] Optionally, the resistance values ​​of the first and second resistors of the magnetic field acquisition unit are between 100 and 150 ohms.

[0007] Optionally, the first magnetic inductor has a length of 6~7mm, a width of 2~2.5mm, and a height of 2~2.5mm.

[0008] Optionally, the inductance value of the first magnetic inductor is between 500 and 600 uH.

[0009] Optionally, the output waveform of the operational amplifier is a square wave.

[0010] On the other hand, the present invention also provides a circuit comprising a magnetic sensor device including any of the above.

[0011] On the other hand, the present invention also provides a magnetic field strength measurement method, which is applied to any of the above circuits, wherein when the output control terminal of the control calculation module is only turned on the first output control terminal, the time for sampling M square waves at the input terminal IN1 is t1, where M is the number of square waves pre-configured.

[0012] When only the second output control terminal of the control calculation module is enabled, the time for sampling N square waves at the input terminal IN1 is t2, where N is the pre-configured number of square waves.

[0013] Current magnetic field strength = (t1 / M) t2 / N) / 2.

[0014] Optionally, N and M are both integers greater than 3. Attached Figure Description

[0015] The accompanying drawings provide a further understanding of the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the drawings:

[0016] Figure 1 A circuit diagram of a magnetic sensor device provided in an embodiment of this disclosure is shown;

[0017] Figure 2 This disclosure illustrates a measurement method for a magnetic sensor device provided in an embodiment of the present disclosure;

[0018] Figure 3 A circuit diagram of another magnetic sensor device provided in an embodiment of this disclosure is shown. Detailed Implementation

[0019] To make the objectives and technical solutions of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this invention.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be used interchangeably where appropriate for the embodiments of the invention described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] To address the problems encountered in the background art, this disclosure provides a magnetic field sensor circuit and method. Specifically, it provides a circuit and method for measuring magnetic field strength.

[0022] The circuit and method for measuring magnetic field strength provided in this disclosure will be described below with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 A structural diagram of a magnetic sensor device provided in an embodiment of this disclosure is shown, such as... Figure 1 As shown, the magnetic sensor circuit includes a first AND gate controller U100, a second AND gate controller U101, a first resistor R100, a second resistor R101, a first magnetic inductor L100, a first analog selector U102, a second analog selector U103, resistors R103, R104, R105, an operational amplifier U105, and a first control calculation module U106.

[0024] In the magnetic field acquisition device 201, the output terminal of the first AND gate controller U100 is connected to the second terminal of the first resistor R100, the output terminal of the second AND gate controller U101 is connected to the second terminal of the second resistor R101, the first terminal of the first resistor R100 is connected to the input terminal of the first magnetic inductor L100 and the input terminal of the first analog selector U102, and the first terminal of the second resistor R101 is connected to the output terminal of the first magnetic inductor L100 and the input terminal of the second analog selector U103.

[0025] In the signal processing device 202, the first end of resistor R103 is connected to the 3.3V power supply, the second end of resistor R103 is connected to the positive input terminal of operational amplifier U105, the first end of resistor R104 is connected to ground, the second end of resistor R104 is connected to the first end of resistor R105, the positive input terminal of operational amplifier U105, and the second end of resistor R103, the negative input terminal of operational amplifier is connected to the output terminal of first analog selector U102 and the output terminal of second analog selector U103, and the output terminal of operational amplifier is connected to the first end of resistor R105, the first input terminal of first AND gate controller U100, and the first input terminal of second AND gate controller U101.

[0026] In the control calculation module 203, the output control terminal OUT1 is connected to the second input terminal of the first AND gate controller U100 and the control terminal of the second analog selector U103, and the output control terminal OUT2 is connected to the second input terminal of the second AND gate controller U101 and the control terminal of the first analog selector U102.

[0027] Figure 2 A flowchart of a magnetic sensor measurement method provided in this disclosure is shown. The magnetic field strength measurement method can be applied to... Figure 1 In the circuit shown, the execution entity is the first control calculation module U106, which includes the following steps: S410, the output control terminals OUT1 and OUT2 output low-level signals. S420, the output control terminal OUT1 outputs a high-level signal, and the input terminal IN1 receives a square wave, triggering the start of timing on the rising edge. S430, after receiving M rising edge trigger signals, the input terminal IN1 ends timing on the next rising edge, recording time t1. S440, the output control terminal OUT1 outputs a low-level signal, the output control terminal OUT2 outputs a high-level signal, and the input terminal IN1 continues to receive square waves, starting timing on the rising edge. S450, after receiving N rising edge trigger signals, the input terminal IN1 ends timing on the next rising edge, recording time t2. S450, according to the formula (t1 / M... t2 / N) / 2 gives the current magnetic field strength value of L100.

[0028] The above steps complete one sampling of a magnetoresistive sensor. Repeating these steps allows for repeated sampling of the controlled magnetoresistive sensor to obtain the latest magnetic field strength value. It is understandable that... Figure 2 The steps of the measurement method shown are as follows: Figure 1 The modules of the magnetic field acquisition device shown correspond to each other and can achieve their respective technical effects.

[0029] Figure 3A structural diagram of another magnetic sensor device provided in this disclosure embodiment is shown. The magnetic sensor device of the present invention may include one or more sets of magnetic field acquisition devices to acquire magnetic field values ​​in the direction of the magnetic inductance of the multiple magnetic field acquisition devices. The figure shows a circuit diagram of two sets of magnetic field acquisition devices.

[0030] The magnetic field acquisition device 204 is the second set of magnetic sensor devices. The device type and connection method are the same as 201, and will not be described again.

[0031] Based on this, the output terminals of analog gates U202 and U203 are connected to the negative input terminal of operational amplifier U105, and the first input terminals of AND gate controllers U200 and U201 are connected to the output terminal of operational amplifier U105. In control calculation module 203, output control terminals OUT3 and OUT4 are added. Output control terminal OUT3 is connected to the second input terminal of AND gate controller U200 and the control terminal of analog gate U203, and output control terminal OUT4 is connected to the second input terminal of AND gate controller U201 and the control terminal of analog gate U202.

[0032] For the measurement method of multiple magnetic sensor devices, each magnetic sensor device is measured sequentially. Figure 2 During the measurement process, it is important to note that when measuring a particular magnetic sensor device, the output terminals of the control calculation module 203 connected to other magnetic sensor devices should always be in a low-level state. For the sake of brevity, this will not be elaborated further here.

[0033] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., within the principles of this application should be included within the scope of the claims of this application.

Claims

1. A magnetic sensor device, characterized by The magnetic field acquisition device, the signal processing device and the control calculation module are composed; the magnetic field acquisition device contains at least one set of magnetic field acquisition unit, each set of magnetic field acquisition unit is composed of a first magnetic sensitive inductor, a first resistor, a second resistor, a first AND gate controller, a second AND gate controller, a first analog gate, a second analog gate; the input end of the first magnetic sensitive inductor is connected with the first end of the first resistor and the input end of the first analog gate, the output end of the first magnetic sensitive inductor is connected with the first end of the second resistor and the input end of the second analog gate, the second end of the first resistor is connected with the output end of the first AND gate controller, the second end of the second resistor is connected with the output end of the second AND gate controller, the direction from the input end to the output end of the first magnetic sensitive inductor is the direction of the measured magnetic field; the signal processing device is composed of an operational amplifier, a resistor R103, a resistor R104 and a resistor R105; the negative input end of the operational amplifier is connected with the output end of the first analog gate and the output end of the second analog gate; the output end of the operational amplifier is connected with the first input end of the first AND gate controller and the first input end of the second AND gate controller; the first end of the resistor R104 is grounded, the second end of the resistor R104 is connected with the positive input end of the operational amplifier; the first end of the resistor R103 is connected with the positive electrode of the power supply, the second end of the resistor R103 is connected with the positive input end of the operational amplifier and the second end of the resistor R104; the first end of the resistor R105 is connected with the output end of the operational amplifier, the second end of the resistor R105 is connected with the second end of the resistor R104; the control calculation module contains a first output control end, a second output control end and an input end IN1; the first output control end of the control calculation module is connected with the second input end of the first AND gate controller and the control end of the second analog gate; the second output control end of the control calculation module is connected with the second input end of the second AND gate controller and the control end of the first analog gate; the input end IN1 of the control calculation module is connected with the output end of the operational amplifier.

2. The magnetic sensor device according to claim 1, characterized in that The resistance values of the first resistor and the second resistor of the magnetic field acquisition unit are equal.

3. The magnetic sensor device according to claim 2, characterized in that The resistance values of the first resistor and the second resistor of the magnetic field acquisition unit are between 100 and 150 ohms.

4. The magnetic sensor device of claim 1, wherein The first magnetic sensitive inductor has a length of 6-7 mm, a width of 2-2.5 mm and a height of 2-2.5 mm.

5. The magnetic sensor device according to claim 4, characterized in that The inductance value of the first magnetic sensitive inductor is between 500 and 600 uH.

6. The magnetic sensor device of claim 1, wherein, The output waveform of the output end of the operational amplifier is a square wave.

7. A circuit, characterized by The magnetic sensor device of any one of claims 1-6 is included.

8. A method of measuring magnetic field strength applied to the circuit of claim 7, characterized by When the output control end of the control calculation module only opens the first output control end, the input end IN1 samples M square wave times as t1, and M is a preconfigured square wave number; when the output control end of the control calculation module only opens the second output control end, the input end IN1 samples N square wave times as t2, and N is a preconfigured square wave number; and the current magnetic field intensity = (t1 / M t2 / N) / 2.

9. The magnetic field strength measuring method according to claim 8, characterized in that, N and M are integers greater than 3.

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