Magnetic flux acquisition excitation circuit
By designing the excitation circuit of charging modules, energy storage capacitors, sampling resistors and microprocessors in the magnetic flux acquisition system, the problems of insufficient AC excitation safety and DC excitation energy in the prior art are solved, and more efficient and safe excitation is achieved Effect.
Patent Information
- Application Number
- CN202421136917.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-23
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-23
AI Technical Summary
In the existing magnetic flux acquisition system, AC excitation has safety and cable skin effect, and DC excitation energy obtained by DC excitation is low, which affects the excitation effect.
A magnetic flux acquisition excitation circuit including a charging module, an energy storage capacitor, a sampling resistor and a microprocessor is designed. The voltage output by the DC power supply unit is boosted by the boost unit, the energy storage capacitor is charged, and the excitation is controlled by the sampling voltage. The operation of the circuit ensures that the boost is stopped when the set voltage is reached and prevents overloading.
It effectively reduces the skin effect, improves the safety of the system and the collection effect of excitation energy, and ensures that the system safety is protected while satisfying the excitation energy.
Smart Images
Figure CN222259555U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engineering measurement, in particular to a magnetic flux collection excitation circuit. 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 sensor is made 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 can be determined. The magnetic flux sensor consists of an excitation coil and an induction coil. When the magnetic flux sensor is inserted through the cable material for measurement, a pulse current is generated in the excitation coil through the excitation source, and a pulse magnetic field needs to be generated in the longitudinal direction of the component.
[0004] Currently, the excitation circuit including the excitation coil can be excited by AC or DC. AC excitation has safety issues and the skin effect of the cable, which affects the safety of the system. The excitation energy obtained by DC excitation is relatively low, which affects the excitation effect. Utility Model Content
[0005] Based on this, the purpose of the utility model is to provide a magnetic flux collection excitation circuit to solve the problems existing in the prior art.
[0006] The utility model provides a magnetic flux collection excitation circuit, comprising a charging module, an energy storage capacitor, a sampling resistor, a microprocessor, and an excitation circuit. The charging module comprises an electrically connected boost unit and a DC power supply unit. The boost unit is electrically connected to the energy storage capacitor. The microprocessor is electrically connected to the boost unit and the sampling resistor respectively. The boost unit comprises an enable port. The microprocessor is used to pull up the enable port of the boost unit so that the boost unit boosts the voltage output by the DC power supply unit, thereby charging the energy storage capacitor. The sampling resistor is electrically connected to the energy storage capacitor and is used to proportionally sample the voltage at both ends of the energy storage capacitor and send the sampled voltage to the microprocessor. When the sampled voltage reaches a sampling threshold, the microprocessor pulls down the enable port of the boost unit so that the boost unit stops working. The excitation circuit is electrically connected to the energy storage capacitor and is used to receive the electric energy change of the energy storage capacitor to realize excitation.
[0007] Preferably, a first switch circuit is electrically connected between the energy storage capacitor and the boost unit, and a second switch circuit is electrically connected between the energy storage capacitor and the excitation circuit.
[0008] Preferably, the first switch circuit and the second switch circuit both include MOS tubes or mechanical relays.
[0009] Preferably, the magnetic flux collection excitation circuit further includes a winding resistor, and the winding resistor is electrically connected to the energy storage capacitor through the second switch circuit, and is used for releasing the voltage across the energy storage capacitor.
[0010] Preferably, the microprocessor is electrically connected to the first switch circuit and the second switch circuit respectively to control the electrical connection state between the energy storage capacitor and the boost unit and between the energy storage capacitor and the excitation circuit respectively.
[0011] Preferably, the ratio of the sampling voltage of the sampling resistor to the voltage across the energy storage capacitor is 1:100.
[0012] Preferably, the withstand voltage of the energy storage capacitor is 400V and the capacitance is 6800uF.
[0013] The beneficial effects of the utility model are as follows: the magnetic flux collection excitation circuit provided by the present application includes a charging module, an energy storage capacitor, a sampling resistor, a microprocessor, and an excitation circuit, wherein the charging module includes a boost unit and a DC power supply unit electrically connected in sequence, and the DC power supply unit is connected to the system power supply; the DC current module can effectively reduce the skin effect and improve the safety of the system; the microprocessor is electrically connected to the boost unit and the sampling resistor respectively, and the boost unit includes an enable port; the DC power supply unit is boosted by the boost unit, and then the energy storage capacitor is charged to improve the collection effect of the excitation energy; when the voltage at both ends reaches the set voltage, the enable port of the boost unit is timely lowered by the microprocessor, so that the boost unit stops working, prevents overload, and protects the system. The magnetic flux collection excitation circuit provided by the utility model can effectively protect the safety of the system under the premise of satisfying the excitation energy.
[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 excitation circuit structure provided by the utility model;
[0016] Figure 2 for Figure 1 Schematic diagram of the circuit structure of the medium boost unit;
[0017] Figure 3 for Figure 1 Schematic diagram of the MOS switch circuit structure;
[0018] Figure 4 for Figure 1 Mechanical relay switching circuit.
[0019] Description of main component symbols:
[0020] 10. Charging module; 11. Boosting unit; 12. DC power supply unit; 20. Energy storage capacitor; 30. Sampling resistor; 40. Microprocessor; 50. Excitation circuit; 60. First switch circuit; 70. Second switch circuit; 80. Winding 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] Specifically, Figure 1As shown, the present invention is a magnetic flux collection excitation circuit, including a charging module 10, an energy storage capacitor 20, a sampling resistor 30, a microprocessor 40, and an excitation circuit 50. The charging module 10 includes a boost unit 11 and a DC power supply unit 12 which are electrically connected in sequence. The boost unit 11 is electrically connected to the energy storage capacitor 20. The microprocessor 40 is electrically connected to the boost unit 11 and the sampling resistor 30 respectively. The boost unit 11 includes an enable port, and the microprocessor 40 is used to pull up the enable port of the boost unit 11 so that the boost unit 11 is electrically connected to the DC power supply. The voltage output by the unit 12 is boosted to charge the energy storage capacitor 20. The sampling resistor 30 is electrically connected to the energy storage capacitor 20 and is used to proportionally sample the voltage across the energy storage capacitor 20 and send the sampled voltage to the microprocessor 40. The microprocessor 40 is also used to detect the sampled voltage. When the sampled voltage reaches the sampling threshold, the microprocessor 40 pulls down the enable port of the boost unit 11 to stop the boost unit 11. The excitation circuit 50 is electrically connected to the energy storage capacitor 20 and is used to receive the electric energy change of the energy storage capacitor 20 to achieve excitation.
[0026] Optionally, in this embodiment, the withstand voltage of the energy storage capacitor 20 is 400V, and the capacitance is 6800uF, which is used for instantaneous excitation of electrical energy storage; the charging module 10 includes a boost unit 11 and a DC power supply unit 12 which are electrically connected in sequence, and the DC power supply unit 12 is connected to the system power supply 13 to supply power to the entire circuit; in this embodiment, the use of a DC current module can effectively reduce the skin effect and improve the safety of the system. Optionally, the DC power supply unit 12 can be DC12V, and the boost unit 11 can realize the function of boosting DC12V to DC300V; Figure 2 As shown, the 1-pin terminal and the 2-pin terminal are the positive power supply electrode and the ground electrode of the boost unit, the 1-pin terminal and the 2-pin terminal are connected to the optocoupler isolation circuit, the 3-pin terminal is the enable port of the boost unit, which starts at a high level and stops at a low level; the 4-pin terminal is the output port of the boost unit; when boosting is required, the microprocessor 40 pulls up the enable port of the boost unit 11, and the boost unit 11 works at this time to boost DC12V to DC300V, thereby charging the energy storage capacitor 20; when charging is completed and boosting is not required, the microprocessor 40 pulls down the enable port of the boost unit 11 to stop the boost unit 11 from working. In this embodiment, the DC power supply unit 12 is boosted by the boost unit 11 to improve the collection effect of the excitation energy.
[0027] Preferably, in order to timely understand the voltage across the energy storage capacitor 20, the magnetic flux collection excitation circuit includes a sampling resistor 30, which is electrically connected to the energy storage capacitor 20 and is used to proportionally sample the voltage across the energy storage capacitor 20 and send it to the ADC conversion interface of the energy storage capacitor 20; the sampling resistor 30 can sample the DC0-300V voltage to 0-3V through resistance proportional sampling; when the set voltage is reached, the microprocessor 40 pulls down the enable port of the boost unit 11 to stop the boost unit 11; charging is completed, and charging continues when the set voltage is not reached; in this embodiment, by setting a sampling resistor, the voltage across the energy storage capacitor 20 is sampled, and when the voltage across the energy storage capacitor 20 reaches the set voltage, the microprocessor 40 timely pulls down the enable port of the boost unit 11 to stop the boost unit 11, prevent overload, and protect the system. The excitation circuit 50 is electrically connected to the energy storage capacitor 20 and is used to receive the electric energy change of the energy storage capacitor 20 to achieve excitation.
[0028] Optionally, in this embodiment, a first switch circuit 60 is electrically connected between the energy storage capacitor 20 and the boost unit 11, and a second switch circuit 70 is electrically connected between the energy storage capacitor 20 and the excitation circuit 50. Figure 3 and Figure 4 As shown, the first switch circuit 60 and the second switch circuit 70 include one of a MOS tube or a mechanical relay. The MOS tube is driven to discharge the excitation coil terminal. When the level is high, the MOS tube is turned on, and one end of the excitation coil terminal is connected to the high voltage output, and the other end is connected to the ground through the MOS tube. When the level is low, the coil and the ground do not form a loop, and no excitation magnetic field is generated. The microprocessor 20 is electrically connected to the first switch circuit 60 and the second switch circuit 70 respectively. The first switch circuit 60 controls the conduction or disconnection between the energy storage capacitor 20 and the boost unit 12, and the second switch circuit 70 controls the conduction or disconnection between the energy storage capacitor 20 and the excitation circuit 50; so as to control the conduction and disconnection of the charging circuit and the discharging circuit of the energy storage capacitor 20.
[0029] In specific implementation, when the boost unit 12 is required to charge the energy storage capacitor 20, the first switch circuit 60 is turned on and the second switch circuit 70 is turned off, and the boost unit 12 charges the energy storage capacitor 20. When charging is not required, the first switch circuit 60 is turned off, and the boost unit 12 and the energy storage capacitor 20 are disconnected; when the energy storage capacitor 20 is charged, excitation discharge is performed, and the first switch circuit 60 is turned off and the second switch circuit 70 is turned on, and the electric energy inside the energy storage capacitor 20 is released to the excitation circuit 50 loop through the second switch circuit 70 to achieve excitation. When excitation is not required, the first switch circuit 60 and the second switch circuit 70 are both turned off to play a protective role.
[0030] Furthermore, in order to achieve voltage regulation and improve system safety, the magnetic flux collection excitation circuit also includes a winding resistor 80, which is electrically connected to the energy storage capacitor 20 through the second switch circuit 70, and is used to release the voltage across the energy storage capacitor 20. Optionally, the parameter specification of the winding resistor 80 can be 130Ω / 10W. When the voltage across the energy storage capacitor 20 is too high, the winding resistor 80 can be connected to the two ends of the energy storage capacitor 20 by switching the second switch circuit 70. At this time, the energy storage capacitor 20 releases energy through the winding resistor 80, reducing the voltage value across the energy storage capacitor 20, and plays a role in regulating the voltage. When the collection system is completed, the winding resistor 80 can also be connected to the two ends of the energy storage capacitor 20 by switching the second switch circuit 70. At this time, the energy storage capacitor 20 releases energy through the winding resistor 80, so that the voltage across the energy storage capacitor 20 is 0.
[0031] In summary, the magnetic flux collection excitation circuit provided by the present application includes a charging module 10, an energy storage capacitor 20, a sampling resistor 30, a microprocessor 40, and an excitation circuit 50. The charging module 10 includes a boost unit 11 and a DC power supply unit 12 electrically connected in sequence, and the DC power supply unit 12 is connected to the system power supply 13; the DC current module can effectively reduce the skin effect and improve the safety of the system; the microprocessor 40 is electrically connected to the boost unit 11 and the sampling resistor 30 respectively, and the boost unit 11 includes an enable port; the DC power supply unit 12 is boosted by the boost unit 11, and then the energy storage capacitor 20 is charged to improve the collection effect of the excitation energy; when the voltage at both ends reaches the set voltage, the enable port of the boost unit 11 is timely lowered by the microprocessor 40, so that the boost unit 11 stops working, prevents overload, and protects the system. The magnetic flux collection excitation circuit provided by the utility model can effectively protect the safety of the system under the premise of meeting the excitation energy, and is suitable for large-scale promotion.
[0032] It should be noted that the above implementation process is only for illustrating the feasibility of the present application, but this does not mean that the magnetic flux collection excitation circuit of the present application has only the above-mentioned implementation processes. On the contrary, as long as the magnetic flux collection excitation circuit of the present application can be implemented, it can be included in the feasible implementation plan of the present application.
[0033] 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.
[0034] 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 excitation circuit, characterized in that: It includes a charging module, an energy storage capacitor, a sampling resistor, a microprocessor, and an excitation circuit. The charging module includes an electrically connected boost unit and a DC power supply unit. The boost unit is electrically connected to the energy storage capacitor. The microprocessor is electrically connected to the boost unit and the sampling resistor, respectively. The boost unit includes an enable port. The microprocessor is used to pull up the enable port of the boost unit so that the boost unit boosts the voltage output by the DC power supply unit, thereby charging the energy storage capacitor. The sampling resistor is electrically connected to the energy storage capacitor and is used to proportionally sample the voltage across the energy storage capacitor and send the sampled voltage to the microprocessor. When the sampled voltage reaches the sampling threshold, the microprocessor pulls down the enable port of the boost unit so that the boost unit stops working. The excitation circuit is electrically connected to the energy storage capacitor and is used to receive the electric energy change of the energy storage capacitor to achieve excitation.
2. The magnetic flux collection excitation circuit according to claim 1, characterized in that: A first switch circuit is electrically connected between the energy storage capacitor and the boost unit, and a second switch circuit is electrically connected between the energy storage capacitor and the excitation circuit.
3. The magnetic flux collection excitation circuit according to claim 2, characterized in that: The first switch circuit and the second switch circuit both include MOS tubes or mechanical relays.
4. The magnetic flux collection excitation circuit according to claim 2, characterized in that: The magnetic flux collection excitation circuit also includes a winding resistor, which is electrically connected to the energy storage capacitor through the second switch circuit and is used to release the voltage across the energy storage capacitor.
5. The magnetic flux collection excitation circuit according to claim 2, characterized in that: The microprocessor is electrically connected to the first switch circuit and the second switch circuit respectively to control the electrical connection state between the energy storage capacitor and the boost unit and between the energy storage capacitor and the excitation circuit respectively.
6. The magnetic flux collection excitation circuit according to claim 1, characterized in that: The ratio of the sampling voltage of the sampling resistor to the voltage across the energy storage capacitor is 1:
100.
7. The magnetic flux collection excitation circuit according to claim 1, characterized in that: The withstand voltage of the energy storage capacitor is 400V, and the capacitance is 6800uF.