Novel eddy current analog quantity sensor circuit

Abstract

The utility model provides a novel eddy current analog quantity sensor circuit, which relates to the technical field of automatic equipment sensor displacement detection and comprises a power supply circuit, an LC oscillating circuit, a multi-stage operational amplification processing circuit and an analog quantity signal output control circuit. Wherein the power supply circuit P1 is a DC 24V circuit power supply end and supplies power to the subsequent signal oscillating circuit, the filtering and amplifying circuit and the operational amplifier control circuit after voltage division processing, the LC oscillating circuit is used for generating an eddy current effect to sense motion of different metal cutting magnetic induction lines, and high-precision analog quantity signals are processed and output through a multi-stage operational amplifier. The device has extremely high reliability and accurate and rapid response capability, shortens the operation time, improves the working efficiency, and realizes a non-contact, high-stability and long-life electrical circuit of the sensor in the operation process of automatic equipment.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor displacement detection of automation equipment, and particularly to a novel eddy current analog sensor circuit. Background Art

[0002] When a block of metal is in a changing magnetic field or moving in a magnetic field, an induced electromotive force will be generated in the metal body, thereby generating a current in the metal body. This current is called eddy current. When the magnetic field is generated by a current, the eddy current generated at this time is called an eddy current.

[0003] Existing eddy current analog sensors have problems such as insufficient detection accuracy, standard analog linear offset, being greatly affected by environmental temperature and humidity, and short service life. Summary of the Utility Model

[0004] In order to overcome the existing problems, the embodiments of the present application provide a novel eddy current analog sensor circuit. The LC oscillation circuit is used to generate the eddy current effect to sense the movement of different metals cutting the magnetic induction line. The output high-precision analog signal is processed by a multi-stage operational amplifier, which has extremely high reliability and accurate and fast response ability, shortens the operation time, improves work efficiency, and realizes a non-contact, highly stable, and long-life electrical circuit for the sensor during the operation of automation equipment.

[0005] The technical solution adopted by the embodiments of the present application to solve its technical problems is:

[0006] A novel eddy current analog sensor circuit includes a power supply circuit, an LC oscillation circuit, a multi-stage operational amplifier processing circuit, and an analog signal output control circuit;

[0007] Among them, the power supply circuit P1 is the power supply terminal of the DC 24V circuit, and after voltage division processing, it supplies power to the subsequent signal oscillation circuit, filter amplification circuit, and operational amplifier control circuit.

[0008] Preferably, the power supply circuit includes a linear voltage regulator chip U0, which is used to output 5V voltage for the supplied DC 24V through the linear voltage regulator chip U0.

[0009] Preferably, the LC oscillation circuit includes an inductor coil and a magnetic ring L1 and an oscillation signal processing chip. The inductor coil and the magnetic ring L1 generate an eddy current effect through the LC oscillation circuit. The metal detection body moves by cutting the magnetic induction line externally, and the generated analog signal is processed by the composite triodes U1-U4. The LC oscillation circuit generates a sine wave signal of 295KHz with a peak value of ±3.84V.

[0010] Preferably, the multi-stage operational amplification processing circuit includes an operational amplifier chip U5, which is used to perform normalization processing on the output signal of the LC oscillation circuit. The analog signal output control circuit performs linearization processing on the signal amplified by the operational amplifier chip U5, and the output signal is normalized to a 4-20 mA / 0-5 V / 0-10 V signal.

[0011] Preferably, the eddy current analog sensor circuit further includes triodes Q1-Q11. The oscillation signal is detected and stabilized by composite triodes U1-U4, and is used to perform filtering and amplification processing on the oscillation signal of triodes Q1-Q11.

[0012] The advantages of the embodiments of this application are:

[0013] This utility model uses an LC oscillation circuit to generate an eddy current effect to sense the movement of different metals cutting magnetic induction lines. Through the processing of a multi-stage operational amplifier, a high-precision analog signal is output. It has extremely high reliability and a precise and rapid response ability, shortens the operation time, improves work efficiency, and realizes a non-contact, highly stable, and long-life electrical circuit for the sensor during the operation of automated equipment. Description of the Drawings

[0014] The following further describes this utility model with reference to the drawings and embodiments.

[0015] Figure 1 It is the general design principle diagram of the power supply circuit of this utility model;

[0016] Figure 2 It is the LC oscillation circuit of this utility model;

[0017] Figure 3 It is the multi-stage operational amplification processing circuit of this utility model;

[0018] Figure 4 It is the analog signal output control circuit of this utility model;

[0019] Figure 5 It is the circuit design structure diagram of this utility model.

[0020] Main reference numeral descriptions:

[0021] U0, linear voltage regulator chip; U1-U4, composite triodes; U5, operational amplifier chip; Q1-Q11, triodes; L1, inductance coil and magnetic ring. Specific Embodiments

[0022] The embodiments of this application provide a new type of eddy current analog sensor circuit to solve the problems in the prior art. An LC oscillation circuit is used to generate the eddy current effect to sense the movement of different metals cutting magnetic field lines. The output high-precision analog signal is processed by a multi-stage operational amplifier, which has extremely high reliability and accurate and fast response ability, shortens the operation time, improves the work efficiency, and realizes a non-contact, highly stable, and long-life electrical circuit for the sensor during the operation of automated equipment.

[0023] The technical solutions in the embodiments of this application to solve the above problems have the following general idea:

[0024] Embodiment

[0025] This embodiment provides a new type of eddy current analog sensor circuit, as Figures 1-5 shown, including a power supply circuit, an LC oscillation circuit, a multi-stage operational amplifier processing circuit, and an analog signal output control circuit;

[0026] Among them, the power supply circuit P1 is the power supply terminal of the DC 24V circuit, and after voltage division processing, it supplies power to the subsequent signal oscillation circuit, filter amplification circuit, and operational amplifier control circuit.

[0027] In some embodiments, the power supply circuit includes a linear voltage regulator chip U0, which is used to output 5V voltage for the supplied DC 24V through the linear voltage regulator chip U0.

[0028] In some embodiments, the LC oscillation circuit includes an inductance coil and magnetic ring L1 and an oscillation signal processing chip. The inductance coil and magnetic ring L1 generate the eddy current effect through the LC oscillation circuit. The metal detector moves by cutting the magnetic field lines externally, and the generated analog signal is processed by the composite triodes U1-U4. The LC oscillation circuit generates a sine wave signal of 295KHz with a peak value of ±3.84V.

[0029] In some embodiments, the multi-stage operational amplifier processing circuit includes an operational amplifier chip U5, which is used to perform standardization processing on the output signal of the LC oscillation circuit. The analog signal output control circuit performs linearization processing on the signal amplified by the operational amplifier chip U5, and the output signal is standardized to 4-20mA / 0-5V / 0-10V signal.

[0030] In some embodiments, the eddy current analog sensor circuit further includes triodes Q1-Q11, which are used to detect and stabilize the oscillation signal through the composite triodes U1-U4 and perform filter amplification processing on the oscillation signal of the triodes Q1-Q11.

[0031] By adopting the above technical solutions:

[0032] The LC oscillation circuit is used to generate the eddy current effect to sense the movement of different metals cutting the magnetic induction lines. Through the processing of multiple operational amplifiers, high-precision analog signals are output. It has extremely high reliability and accurate and rapid response capabilities, shortening the operation time, improving work efficiency, and realizing a non-contact, highly stable, and long-life electrical circuit for sensors during the operation of automated equipment.

[0033] The specific implementation is as follows: Use a linear voltage regulator chip U0, an oscillation signal processing chip, an LC oscillation circuit to generate the eddy current effect, and a triode saturation amplification circuit to design a power supply circuit, an oscillation induction circuit, and an analog output circuit.

[0034] The LC oscillation circuit is used to generate the eddy current effect to sense the movement of different metals cutting the magnetic induction lines. Through the processing of multiple operational amplifiers, high-precision analog signals are output. It has extremely high reliability and accurate and rapid response capabilities, shortening the operation time, improving work efficiency, and realizing a non-contact, highly stable, and long-life electrical circuit for sensors during the operation of automated equipment.

[0035] As Figure 1 shown, the power supply circuit includes a linear voltage regulator chip U0, which is used to output a 5V voltage for the power supply DC 24V through the linear voltage regulator chip U0.

[0036] As Figure 2 shown, the LC oscillation circuit includes an inductor coil and a magnetic ring L1 and an oscillation signal processing chip. The inductor coil and the magnetic ring L1 generate the eddy current effect through the LC oscillation circuit. The metal detector generates an analog signal through the external movement of cutting the magnetic induction lines, and the analog signal is processed by the composite triodes U1-U4. The LC oscillation circuit generates a sine wave signal of 295KHz with a peak value of ±3.84V.

[0037] As Figure 3 shown, the multiple operational amplifier processing circuit includes an operational amplifier chip U5, which is used to standardize the output signal of the LC oscillation circuit. The analog signal output control circuit linearly processes the signal amplified by the operational amplifier chip U5, and the output signal is standardized to 4-20mA / 0-5V / 0-10V signals.

[0038] As Figure 4 shown, the eddy current analog sensor circuit also includes triodes Q1-Q11. The composite triodes U1-U4 are used to detect and stabilize the oscillation signal, and are used to filter and amplify the oscillation signal of the triodes Q1-Q11.

[0039] As Figure 5As shown, the LC oscillation circuit detection circuit generates an oscillation signal. The oscillation signal is subjected to detection and stabilization processing, and the oscillation signal is subjected to filtering, arithmetic, and amplification processing of the signal. The output analog signal is linearly processed, and the standard analog signal 4 - 20 mA / 0 - 5 V / 0 - 10 V is output.

[0040] Finally, it should be noted that: Obviously, the above embodiments are only examples given to clearly illustrate the present invention, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A novel eddy current analog sensor circuit, characterized in that: It includes a power supply circuit, an LC oscillation circuit, a multi-stage operational amplifier processing circuit and an analog signal output control circuit; The power supply circuit P1 is a DC 24V circuit power supply terminal, which supplies power to the subsequent oscillator circuit, filter amplifier circuit and operational amplifier control circuit after voltage division processing.

2. A novel eddy current analog sensor circuit as claimed in claim 1, characterized in that: The power supply circuit includes a linear voltage regulator chip (U0) for supplying DC 24V outputs 5V voltage through the linear voltage regulator chip (U0).

3. A novel eddy current analog sensor circuit as claimed in claim 1, characterized in that: The LC oscillation circuit comprises an inductor coil and a magnetic ring (L1) and an oscillation signal processing chip. The inductor coil and the magnetic ring (L1) generate an eddy current effect through the LC oscillation circuit. The metal detection body moves by cutting the magnetic flux lines externally, and generates an analog signal which is processed by a composite triode (U1-U4).

4. A novel eddy current analog sensor circuit as claimed in claim 1, characterized in that: The multi-stage operational amplifier processing circuit comprises an operational amplifier chip (U5) for performing standardization processing on the output signal of the LC oscillation circuit.

5. A novel eddy current analog sensor circuit as claimed in claim 3, characterized in that: The eddy current analog sensor circuit also includes a transistor (Q1-Q11), which detects and stabilizes the oscillation signal through a composite transistor (U1-U4) and is used to filter and amplify the oscillation signal of the transistor (Q1-Q11).

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