Magnetic flux acquisition circuit and magnetic flux engineering measuring instrument

Abstract

The utility model provides a magnetic flux acquisition circuit and a magnetic flux engineering measuring instrument, the magnetic flux acquisition circuit comprises an excitation circuit, an induction coil and a conversion circuit, the excitation circuit comprises an energy storage capacitor, a switching circuit and an excitation coil, and the energy storage capacitor is connected with the excitation coil through the switching circuit. The induction coil is used for inducting excitation output by the excitation coil and outputting induction signals, the conversion circuit comprises an integrating circuit, an ADC conversion circuit, a microprocessor and an EEPROM which are electrically connected in sequence, the integrating circuit is used for processing the induction signals generated by the induction coil, the ADC conversion circuit is used for quantitatively collecting the induction signals subjected to integration processing, and the microprocessor is used for outputting the induction signals. And a capacitance value difference coefficient is written into the EEPROM memory, and the EEPROM memory is used for correcting the induction signal acquired by the ADC conversion circuit so as to improve the consistency of the quantized acquisition signal. The magnetic flux acquisition circuit provided by the utility model is high in signal acquisition consistency and good in universality.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering measurement, in particular to a magnetic flux collection circuit and a magnetic flux collection system. Background Art

[0002] Cables are commonly used in bridge load-bearing structures or towing devices. The change of load on the cable is crucial to the safety of the cable. Conventional cable load measurement is mainly carried out through magnetic flux acquisition systems.

[0003] The magnetic flux collection system is based on the principle of magnetoelastic effect of ferromagnetic materials, that is, when the external mechanical load on the ferromagnetic material changes, its internal magnetic permeability changes. By measuring the change in magnetic permeability of the component made of ferromagnetic material, the internal force of the component is determined. When the magnetic flux sensor is working, the excitation coil generates an excitation magnetic field. At this time, through the coupling of the ferromagnetic material, the induction coil winding generates an induced voltage, which is a pulse voltage.

[0004] However, the pulse voltage has a short duration and high amplitude, and the acquisition of this signal has certain requirements for the design of the acquisition circuit and the selection of components. Due to the differences in component parameters, the consistency of the acquisition equipment is a problem, which affects the use and versatility of the acquisition system. Utility Model Content

[0005] Based on this, the purpose of the utility model is to provide a magnetic flux collection circuit to solve the problems existing in the prior art.

[0006] The utility model provides a magnetic flux acquisition circuit, comprising an excitation circuit, an induction coil, and a conversion circuit. The excitation circuit comprises an energy storage capacitor, a switch circuit, and an excitation coil. The energy storage capacitor is connected to the excitation coil through the switch circuit. The induction coil is used to sense the excitation output by the excitation coil and output an induction signal. The conversion circuit comprises an integration circuit, an ADC conversion circuit, a microprocessor, and an EEPROM memory which are electrically connected in sequence. The integration circuit is electrically connected to the induction coil and is used to process the induction signal generated by the induction coil. The ADC conversion circuit is used to perform quantitative acquisition on the processed induction signal. The EEPROM memory is written with a capacitance difference coefficient and is used to correct the quantitatively acquired induction signal to improve the consistency of the quantitatively acquired signal.

[0007] The beneficial effects of the utility model are as follows: the magnetic flux acquisition circuit provided by the application comprises an excitation circuit, an induction coil, and a conversion circuit, the excitation circuit comprises an energy storage capacitor, a switch circuit, and an excitation coil, the energy storage capacitor is connected to the excitation coil through the switch circuit, the induction coil is used to sense the excitation output by the excitation coil and output an induction signal, the conversion circuit comprises an integration circuit, an ADC conversion circuit, a microprocessor, and an EEPROM memory electrically connected in sequence, the EEPROM memory is written with a capacitance difference coefficient; in the magnetic flux acquisition circuit provided by the application, the excitation circuit realizes the excitation of the signal and enables the induction coil to generate an induction signal, the integration circuit is connected to the ADC conversion circuit for quantitative acquisition after conversion, the EEPROM memory is written with a capacitance difference coefficient, the acquisition value of the ADC conversion circuit can be corrected, and the consistency of the acquisition result is ensured; the magnetic flux acquisition circuit provided by the application simultaneously has the functions of sensor excitation, induction signal acquisition, and capacitance difference correction, so as to ensure the consistency of the acquisition result and improve the versatility of the acquisition system.

[0008] Preferably, the switch circuit is also electrically connected to the microprocessor to control the operation of the microprocessor and further control the operation of the ADC conversion circuit.

[0009] Preferably, the integration circuit comprises an integration control circuit and a signal adjustment circuit which are electrically connected, the SENOR_IN input terminal of the integration control circuit is electrically connected to the induction coil, and the F1 output terminal of the signal adjustment circuit is electrically connected to the ADC conversion circuit.

[0010] Preferably, an integral resistor is connected between the integral control circuit and the induction coil, an integral capacitor is connected in parallel between the input and output ends of the integral control circuit, a protection resistor is connected in parallel to the integral capacitor, a first feedback resistor is connected between the integral control circuit and the signal adjustment circuit, and a second feedback resistor is connected in parallel between the input and output ends of the signal adjustment circuit.

[0011] Preferably, the ADC conversion circuit is provided with an AINP interface and an AININ interface, and the ADC conversion circuit is electrically connected to the integration circuit via the AINP interface and the AININ interface.

[0012] Preferably, the circuit of the EEPROM memory includes an I2C2_SDA interface and an I2C2_SCL interface, and the EEPROM memory is electrically connected to the microprocessor via the I2C2_SDA interface and the I2C2_SCL interface.

[0013] The utility model also provides a magnetic flux engineering measuring instrument, which comprises the magnetic flux collection circuit.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the magnetic flux collection circuit structure provided by the utility model;

[0016] Figure 2 for Figure 1 Schematic diagram of the integrator circuit structure;

[0017] Figure 3 for Figure 1 Schematic diagram of ADC conversion circuit structure;

[0018] Figure 4 for Figure 1 Schematic diagram of the circuit structure of the EEPROM memory.

[0019] Description of main component symbols:

[0020] 10. Excitation circuit; 11. Energy storage capacitor; 12. Switching circuit; 13. Excitation coil; 20. Induction coil; 30. Conversion circuit; 31. Integration circuit; 32. ADC conversion circuit; 33. Microprocessor; 34. EEPROM memory, R1, first integration resistor; R2, second integration resistor; R3, feedback resistor; R4, feedback resistor.

[0021] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0023] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] Example 1

[0026] Specifically, Figure 1 As shown, a magnetic flux collection circuit of an embodiment of the utility model includes an excitation circuit 10, an induction coil 20, and a conversion circuit 30. The excitation circuit 10 includes an energy storage capacitor 11, a switch circuit 12, and an excitation coil 13. The energy storage capacitor 11 is connected to the excitation coil 13 through the switch circuit 12. The induction coil 20 is used to sense the excitation output by the excitation coil 13 and output an induction signal. The conversion circuit 30 includes an integration circuit 31, an ADC conversion circuit 32, a microprocessor 33, and an EEPROM memory 34 (Electrically Erasable Programmable read only memory) that are electrically connected in sequence. The integration circuit 31 is electrically connected to the induction coil 20 for processing the induction signal generated by the induction coil 20. The ADC conversion circuit 32 is electrically connected to the integration circuit 31 for quantizing and collecting the induction signal after the integration processing. The EEPROM memory 34 is written with a capacitance difference coefficient. The EEPROM memory 34 is electrically connected to the ADC conversion circuit 32 through the microprocessor 33 for correcting the collected induction signal to improve the consistency of the quantized collection signal.

[0027] Optionally, in the present embodiment, the withstand voltage of the energy storage capacitor 11 is 400V, and the capacitance is 6800uF. The energy storage capacitor 11 can be charged by an external boost device. When the charging voltage is reached, the excitation coil 13 is connected to both ends of the energy storage capacitor 11 through the switching circuit 12. At this time, the electric energy stored in the energy storage capacitor 11 is released to the excitation coil 13 to realize excitation. The induction coil 20 senses the excitation of the excitation coil 13 and outputs an induction signal. Optionally, in the present embodiment, the induction signal generated by the winding of the induction coil 20 is an induced voltage, which is a pulse voltage with a duration of about 10ms and an amplitude of more than 30V.

[0028] The integration circuit 31 is connected to the induction coil 20, and is used to convert the induction signal generated by the induction coil. After the conversion, the integration circuit 31 is connected to the ADC conversion circuit 32 for quantitative acquisition. Optionally, the switch circuit is also electrically connected to the microprocessor 33 to control the operation of the microprocessor 33, and then control the operation of the ADC conversion circuit 32. The ADC conversion circuit 32 is controlled and acquired by the microprocessor 33; further, the magnetic flux acquisition circuit is also designed with an EEPROM memory 34, and the EEPROM memory is written with a capacitor capacitance difference coefficient, which can effectively correct the influence of possible differences in components such as capacitors in different integration circuits 31, and correct the acquisition value of the ADC conversion circuit 32 to ensure the consistency of the acquisition results; the magnetic flux acquisition circuit provided in the present application simultaneously has the functions of sensor excitation, induction signal acquisition, and capacitance difference correction, thereby ensuring the consistency of the acquisition results and improving the versatility of the acquisition system.

[0029] Optionally, in this embodiment, if Figure 2 As shown, the integration circuit 31 includes an integration control circuit and a signal adjustment circuit that are electrically connected. The SENOR_IN input terminal of the integration control circuit is electrically connected to the induction coil 20, and the F1 output terminal of the signal adjustment circuit is electrically connected to the ADC conversion circuit 32. An integration resistor R1 is connected between the integration control circuit and the induction coil; an integration capacitor is connected in parallel between the input terminal and the output terminal of the integration control circuit, and a protection resistor R3 is connected in parallel to the integration capacitor to suppress excessive zero drift gain. Preferably, the resistance value of the integration resistor R1 is 200K, and the resistance value of the protection resistor R3 is 2MK. A first feedback resistor R2 is connected between the integration control circuit and the signal adjustment circuit, and a second feedback resistor R4 is connected in parallel between the input terminal and the output terminal of the signal adjustment circuit. The ratio of the gain of the signal adjustment circuit can be adjusted by adjusting the ratio of the first feedback resistor R2 and the second feedback resistor R4.

[0030] Optionally, in this embodiment, if Figure 3 As shown, the ADC conversion circuit 32 is provided with an AINP interface and an AININ interface. The ADC conversion circuit is electrically connected to the integration circuit 31 through the AINP interface and the AININ interface, and is electrically connected to the microcontroller through the MODE interface, the FORMAT interface, the SYNC interface, and the DIN interface.

[0031] Optionally, in this embodiment, if Figure 4 As shown, the circuit of the EEPROM memory 34 includes an I2C2_SDA interface and an I2C2_SCL interface, and the EEPROM memory 34 is electrically connected to the microprocessor 33 via the I2C2_SDA interface and the I2C2_SCL interface.

[0032] In summary, the magnetic flux acquisition circuit provided by the present application includes an excitation circuit 10, an induction coil 20, and a conversion circuit 30. The excitation circuit 10 includes an energy storage capacitor 11, a switching circuit 12, and an excitation coil 13. The energy storage capacitor 11 is connected to the excitation coil 13 through the switching circuit 12. The induction coil 20 is used to sense the excitation output by the excitation coil 13 and output an induction signal. The conversion circuit 30 includes an integration circuit 31, an ADC conversion circuit 32, a microprocessor 33, and an EEPROM memory 34 that are electrically connected in sequence. The EEPROM memory 34 is written with a capacitance difference coefficient; in the magnetic flux acquisition circuit provided by the present application, the excitation circuit 10 realizes the excitation of the signal and enables the induction coil 20 to generate an induction signal. After conversion, the integration circuit 31 is connected to the ADC conversion circuit 32 for quantitative acquisition. The EEPROM memory is written with a capacitance difference coefficient, and the acquisition value of the ADC conversion circuit 32 can be corrected to ensure the consistency of the acquisition result; the magnetic flux acquisition circuit provided by the present application simultaneously has the functions of sensor excitation, induction signal acquisition, and capacitance difference correction, thereby ensuring the consistency of the acquisition result and improving the versatility of the acquisition system.

[0033] Example 2

[0034] This embodiment provides a magnetic flux engineering measuring instrument, including the magnetic flux acquisition circuit in Embodiment 1.

[0035] It should be noted that the above implementation process is only to illustrate the feasibility of the present application, but this does not mean that the magnetic flux collection circuit and magnetic flux engineering measuring instrument of the present application only have the above-mentioned implementation processes. On the contrary, as long as the magnetic flux collection circuit and magnetic flux engineering measuring instrument of the present application can be implemented, they can be included in the feasible implementation plan of the present application.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A magnetic flux collection circuit, characterized in that: The invention comprises an excitation circuit, an induction coil and a conversion circuit. The excitation circuit comprises an energy storage capacitor, a switch circuit and an excitation coil. The energy storage capacitor is connected to the excitation coil through the switch circuit. The induction coil is used to sense the excitation output by the excitation coil and output an induction signal. The conversion circuit comprises an integration circuit, an ADC conversion circuit, a microprocessor and an EEPROM memory which are electrically connected in sequence. The integration circuit is electrically connected to the induction coil and is used to process the induction signal generated by the induction coil. The ADC conversion circuit is used to quantize and collect the processed induction signal. The EEPROM memory is written with a capacitance difference coefficient and is used to correct the quantitatively collected induction signal to improve the consistency of the quantitatively collected signal.

2. The magnetic flux collection circuit according to claim 1, characterized in that: The switch circuit is also electrically connected to the microprocessor to control the operation of the microprocessor and further control the operation of the ADC conversion circuit.

3. The magnetic flux collection circuit according to claim 1, characterized in that: The integration circuit includes an integration control circuit and a signal adjustment circuit which are electrically connected. The SENOR_IN input terminal of the integration control circuit is electrically connected to the induction coil, and the F1 output terminal of the signal adjustment circuit is electrically connected to the ADC conversion circuit.

4. The magnetic flux collection circuit according to claim 3, characterized in that: An integral resistor is connected between the integral control circuit and the induction coil, an integral capacitor is connected in parallel between the input and output ends of the integral control circuit, a protection resistor is connected in parallel to the integral capacitor, a first feedback resistor is connected between the integral control circuit and the signal adjustment circuit, and a second feedback resistor is connected in parallel between the input and output ends of the signal adjustment circuit.

5. The magnetic flux collection circuit according to claim 1, characterized in that: The ADC conversion circuit is provided with an AINP interface and an AININ interface, and the ADC conversion circuit is electrically connected to the integration circuit via the AINP interface and the AININ interface.

6. The magnetic flux collection circuit according to claim 1, characterized in that: The circuit of the EEPROM memory includes an I2C2_SDA interface and an I2C2_SCL interface, and the EEPROM memory is electrically connected to the microprocessor via the I2C2_SDA interface and the I2C2_SCL interface.

7. A magnetic flux engineering measuring instrument, characterized in that: It comprises the magnetic flux collection circuit described in any one of claims 1-6.

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