Current measurement method, current detection system, and electronic device

Abstract

The present invention discloses a current measurement method, a current detection system and an electronic device, and relates to the field of current detection technology, wherein the current measurement method includes the following steps: a first step, a first detection component responds to the magnetic field generated by the conductor within different frequency ranges, and outputs a first signal and a second signal; a second detection component responds to the residual magnetic field generated by the conductor, and outputs a third signal; a second step, a processing unit receives the first signal, the second signal and the third signal, and the processing unit determines the load current of the conductor through one of the first signal or the second signal that meets the preset requirements, and the processing unit determines the leakage current of the conductor through the third signal; a third step, judging whether the conductor has a leakage current risk through the load current and the leakage current. The load current obtained by such a detection method is accurate and reliable, and it is also accurate and reliable to confirm whether the conductor has a leakage current risk, thereby improving the reliability of the measurement result of the current detection method.

Description

Technical Field

[0001] The present invention relates to the technical field of current detection, and in particular to a current measurement method, a current detection system and an electronic device. Background Art

[0002] Current sensors are devices that detect current and are commonly used in current measurement and protection systems in fields such as photovoltaics, wind power, electric power, smart grids, railway electromechanics, aerospace, and new energy vehicles. As primary detection components, current sensors play a vital role in ensuring system safety and stability. To ensure the safe and reliable operation of these products, real-time detection and monitoring of current, leakage current, and other indicators are required.

[0003] Currently, existing monitoring circuits generally install two current sensors: one sensor measures the working current in the circuit, and the other sensor measures the leakage current in the circuit. These two sensors are installed independently to achieve different detection functions to confirm whether there is a leakage current risk in the equipment. However, this detection method can only detect at a specific frequency. If the frequency of the working current exceeds the specific frequency, this detection method cannot guarantee the reliability of the detection results. Summary of the Invention

[0004] The main purpose of the present invention is to provide a current detection system, an electronic device and a current measurement method, aiming to solve the technical problem of low reliability of measurement results of current detection methods in the prior art.

[0005] To achieve the above object, according to one aspect of the present invention, a current measurement method is provided, comprising the following steps:

[0006] The first detection component responds to the magnetic field generated by the conductor within different frequency ranges and outputs a first signal and a second signal; the second detection component responds to the residual magnetic field generated by the conductor and outputs a third signal;

[0007] A processing unit receives the first signal, the second signal, and the third signal, wherein the processing unit determines the load current of the wire according to the first signal or the second signal that meets a preset requirement, and determines the leakage current of the wire according to the third signal;

[0008] Whether the wire has a leakage current risk is determined by the load current and the leakage current.

[0009] In one embodiment, the processing unit determines the load current of the wire according to one of the first signal or the second signal that meets a preset requirement, including the following steps:

[0010] The processing unit determines whether the first signal is less than a first threshold;

[0011] When the first signal is less than the first threshold, the processing unit determines the load current of the wire through the first signal; when the first signal is higher than the first threshold, the processing unit determines the load current of the wire through the second signal.

[0012] In one embodiment, the processing unit determining the leakage current of the wire according to the third signal comprises the following steps:

[0013] The processing unit determines whether the third signal is less than a second threshold;

[0014] When the third signal is less than the second threshold, the processing unit determines the leakage current of the wire through the third signal; when the third signal is higher than the second threshold, a detection alarm is triggered.

[0015] In one embodiment, determining whether the wire has a leakage current risk based on the load current and the leakage current includes the following steps:

[0016] The processing unit determines whether a difference obtained by subtracting a product of the load current and a constant coefficient from the leakage current is less than a third threshold;

[0017] When the difference obtained by subtracting the product of the load current and the constant coefficient from the leakage current is less than the third threshold, there is no leakage current risk for the wire; when the difference obtained by subtracting the product of the load current and the constant coefficient from the leakage current is greater than or equal to the third threshold, there is a leakage current risk for the wire, and a leakage alarm is triggered.

[0018] According to another aspect of the present invention, a current detection system is provided. The current detection system applies the above-described current measurement method. The current detection system includes the first detection component, the second detection component, and the processing unit. The first detection component includes a first detection module and a second detection module. The first detection module is configured to respond to a magnetic field generated by the conductor within a first frequency range and output a first signal. The second detection module is configured to respond to the magnetic field generated by the conductor within a second frequency range and output a second signal. The second detection component includes a third detection module, which is configured to respond to a residual magnetic field of the conductor and output a third signal.

[0019] The processing unit is configured to receive the first signal, the second signal, and the third signal, and determine whether the wire has a leakage current risk.

[0020] In one embodiment, the first detection module includes a first magnetic focusing ring and a first magnetic resistance unit, the first magnetic focusing ring forms a first air gap, and the first magnetic resistance unit is arranged in the first air gap; the second detection module includes a second magnetic focusing ring and a second magnetic resistance unit, the second magnetic focusing ring forms a second air gap, and the second magnetic resistance unit is arranged in the second air gap; or,

[0021] The first detection module includes a first magnetic focusing ring, a first magnetic resistance unit and a second magnetic resistance unit. The first magnetic focusing ring forms a first air gap and a second air gap. The first magnetic resistance unit is arranged in the first air gap, and the second magnetic resistance unit is arranged in the second air gap. The second detection module includes a second magnetic focusing ring.

[0022] In one embodiment, the current detection system further includes a fourth detection module, which is disposed around the conductor. The fourth detection module responds to a magnetic field generated by the conductor within a third frequency range and outputs a fourth signal. The processing unit receives the fourth signal and calculates the load current of the conductor.

[0023] In one embodiment, the second frequency range is higher than the first frequency range.

[0024] In one embodiment, the operating magnetic field range of the first detection component is greater than the operating magnetic field range of the second detection component.

[0025] According to another aspect of the present invention, the present invention further provides an electronic device, comprising the above-mentioned current detection system, wherein the first detection module, the second detection module and the third detection module are all arranged close to the conductor.

[0026] In the above solution, the current measurement method includes the following steps:

[0027] The first detection component responds to the magnetic field generated by the conductor within different frequency ranges and outputs a first signal and a second signal; the second detection component responds to the residual magnetic field generated by the conductor and outputs a third signal;

[0028] The processing unit receives the first signal, the second signal, and the third signal, and determines the load current of the conductor according to the first signal or the second signal that meets the preset requirements, and determines the leakage current of the conductor according to the third signal;

[0029] Use the load current and leakage current to determine whether the wire has leakage current risk.

[0030] Specifically, the first detection component responds to the magnetic field generated by the wire within different frequency ranges and outputs a first signal and a second signal. In fact, two detection units with the same working magnetic field range are provided in the first measurement component. When the wire is energized and generates a magnetic field within different frequency ranges, the two detection units will respond to the magnetic field generated by the wire, and then the two detection units will output signals respectively, namely the first signal and the second signal. When the wire is powered off, there is still a residual magnetic field inside the wire, and the second detection component will respond to the residual magnetic field of the wire and output a third signal. The processing unit receives the first signal, the second signal and the third signal, and the software in the processing unit is set with preset requirements. The processing unit determines which of the first signal and the second signal meets the preset requirements, and then selects the signal that meets the requirements, and calculates the load current of the wire through this signal. The processing unit also calculates the leakage current of the wire through the third signal. In fact, the leakage current obtained is an approximate value. In order to determine whether there is a leakage current risk in the wire, data processing is still required. Therefore, the processing unit collects the load current and leakage current, and then calculates whether there is a leakage current risk in the wire through a preset calculation formula in the processing unit, thereby completing the leakage current detection; the present invention uses two detection units in the first detection component, and the frequency ranges in which the two detection units can respond normally are different. In this way, when the wire is energized and the magnetic field generated in different frequency ranges is generated, no matter which frequency range, there will always be one of the two detection units that can respond normally, so the load current obtained can ensure that the detection result is accurate and reliable. Therefore, the final result of whether the wire has a leakage current risk is also accurate and reliable, which greatly improves the reliability of the measurement results of the current detection method. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0032] Figure 1 1 is a flow chart of a current detection method according to a first embodiment of the present invention;

[0033] Figure 2 1 is a flow chart of a current detection method according to a second embodiment of the present invention;

[0034] Figure 3 1 is a flow chart of a current detection method according to a third embodiment of the present invention;

[0035] Figure 41 is a flow chart of a current detection method according to a fourth embodiment of the present invention;

[0036] Figure 5 A schematic structural diagram of an embodiment of a current detection system provided by the present invention;

[0037] Figure 6 This is a structural schematic diagram of another embodiment of the current detection system provided by the present invention.

[0038] Description of Figure Numbers:

[0039] 100. Current detection system; 1. First detection component; 11. First detection module; 12. Second detection module; 111. First magnetic focusing ring; 112. First magnetoresistance unit; 111a. First air gap; 121. Second magnetic focusing ring; 122. Second magnetoresistance unit; 121a. Second air gap; 2. Second detection component; 21. Third detection module; 211. Third magnetic focusing ring; 212. Third magnetoresistance unit; 211a. Accommodation cavity; 211b. Third air gap.

[0040] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0042] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0043] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0044] To achieve the above purpose, see Figure 1 , Figure 1 FIG. 1 is a flow chart of a current detection method according to a first embodiment of the present invention. According to one aspect of the present invention, a current measurement method is provided, comprising the following steps:

[0045] S1, responding to the magnetic field generated by the conductor within different frequency ranges through the first detection component 1 and outputting a first signal and a second signal; responding to the residual magnetic field generated by the conductor through the second detection component 2 and outputting a third signal;

[0046] When the wire is energized and generates a magnetic field within a different frequency range, the first detection component 1 responds to the magnetic field generated by the wire, so that the first detection component 1 will output the first signal and the second signal at the same time. In fact, the first detection component 1 is provided with two first detection modules 11 and the second detection module 12 with the same working magnetic field range. The first detection module 11 and the second detection module 12 can both adopt tunnel magnetoresistive sensors, etc., which can measure the resistance change caused by the external magnetic field. When an external magnetic field is applied, the probability of electrons tunneling from one magnetic electrode to another magnetic electrode through the insulating layer will change, thereby causing a change in resistance, so that a resistance signal will be output. The tunnel magnetoresistive sensor can also adopt a Wheatstone bridge structure. When the resistance of the tunnel magnetoresistive sensor is affected by the magnetic field, When the field strength changes, the output voltage of the bridge will also change accordingly, and the bridge will generate a differential voltage output proportional to the resistance change of the tunnel magnetoresistive sensor, thereby outputting a voltage signal. Both structures can be used in this current detection method; therefore, the first detection module 11 and the second detection module 12 respond to the magnetic field generated by the wire, and then the first detection module 11 and the second detection module 12 output signals, that is, the first signal and the second signal respectively; the method of folding the wire in half is adopted to make the current in part of the wire opposite to the current in the original wire. Other methods can also be used, which are not limited here. When the parts of the wire with opposite current directions pass through the second detection component 2 at the same time, the second detection component 2 will respond to the residual magnetic field of the wire and output a third signal.

[0047] S2. The processing unit receives the first signal, the second signal, and the third signal, and determines the load current of the wire according to the first signal or the second signal that meets the preset requirements, and determines the leakage current of the wire according to the third signal.

[0048] Before detection, preset requirements will be set in the software in the processing unit. The processing unit will receive the first signal and the second signal output by the first detection component 1, and will also receive the third signal output by the second detection component 2. In this way, the software in the processing unit will select the first signal and the second signal to determine which one meets the preset requirements, and then select the signal that meets the requirements. The processing unit calculates the load current of the wire through this signal. The processing unit also calculates the leakage current of the wire through the third signal. In fact, the leakage current obtained is an approximate value, which may deviate from the actual leakage current situation. In order to determine whether there is a leakage current risk in the wire, further data processing is required.

[0049] S3. Determine whether the wire has leakage current risk based on the load current and leakage current.

[0050] The processing unit collects the load current and leakage current, and then calculates whether there is a leakage current risk in the wire through a preset calculation formula in the processing unit, thereby completing the leakage current detection.

[0051] In this embodiment, the first detection module 11 and the second detection module 12 in the first detection component 1 have different frequency ranges in which the first detection module 11 and the second detection module 12 can normally respond. In this way, when the wire is energized and generates a magnetic field in different frequency ranges, no matter which frequency range, there will always be one of the first detection module 11 and the second detection module 12 that can respond normally. The load current obtained in this way can ensure that the detection result is accurate and reliable. Therefore, the final result of whether the wire has a leakage current risk is also accurate and reliable, which greatly improves the reliability of the measurement results of the current detection method.

[0052] See also Figure 2 , Figure 2 2 is a flow chart of a current detection method according to a second embodiment of the present invention. In one embodiment, the processing unit determines the load current of the conductor by using a first signal or a second signal that meets a preset requirement, including the following steps:

[0053] S21, the processing unit determines whether the first signal is less than a first threshold;

[0054] Before the detection, a preset requirement is set in the software in the processing unit, wherein the preset requirement is whether the first signal received by the processing unit is smaller than a first threshold.

[0055] S22. When the first signal is less than a first threshold, the processing unit determines the load current of the wire through the first signal; when the first signal is higher than the first threshold, the processing unit determines the load current of the wire through the second signal.

[0056] The first detection module 11 and the second detection module 12 can both change with the change of the magnetic field generated by the wire within a certain frequency magnetic field range, but the normal response frequency ranges of the first detection module 11 and the second detection module 12 are different. The frequency range in which the second detection module 12 can normally respond is greater than the frequency range in which the first detection module 11 normally responds. When the frequency is low, the first detection module 11 will respond to the magnetic field of the wire and output a first signal, so that the first signal will be less than the first threshold; the second detection module 12 will also respond to the magnetic field of the wire and output a second signal. Since the current frequency is not within the normal response frequency range of the second detection module 12, it is concluded that The second signal is inaccurate, so the processing unit will calculate the load current through the first signal, and the load current obtained in this way is highly reliable; when the frequency is too high, exceeding the frequency range of normal response of the first detection module 11, the first signal output by the first detection module 11 will exceed the first threshold, and the first signal is inaccurate, so if the load current calculated using the signal of the first detection module 11 is unreliable; at this time, the frequency is within the frequency range of normal response of the second detection module 12, so the second signal output by the second detection module 12 in response to the magnetic field of the wire is highly reliable, and the processing unit will calculate a reliable load current through the second signal.

[0057] In this embodiment, by setting the first threshold, the first threshold is set to the maximum value of the first signal that can be output by the first detection module 11, so that when the first signal is less than the first threshold, the processing unit uses the first signal to calculate the load current; when the first signal exceeds the first threshold, it indicates that the first signal is unreliable, and the processing unit will use the second signal to calculate the load current, thereby greatly improving the detection reliability of the load current.

[0058] See also Figure 3 , Figure 3 FIG. 5 is a flow chart of a current detection method according to a third embodiment of the present invention. In one embodiment, the processing unit determines the leakage current of the conductor according to the third signal, including the following steps:

[0059] S23, the processing unit determines whether the third signal is less than the second threshold;

[0060] Before the detection, a second preset requirement is set in the software in the processing unit, wherein the preset requirement is whether the third signal received by the processing unit is smaller than the second threshold.

[0061] S24. When the third signal is less than the second threshold, the processing unit determines the leakage current of the wire through the third signal; when the third signal is higher than the second threshold, a detection alarm is triggered.

[0062] The second detection component 2 can change with the change of the magnetic field generated by the conductor within its rated working magnetic field range. When the parts of the conductor with opposite current directions pass through the second detection component 2 at the same time, the second detection component 2 will respond to the residual magnetic field and output a third signal. When the residual magnetic field is small, that is, the third signal output by the second detection component 2 is less than the second threshold, the processing unit will determine the leakage current of the conductor through the third signal; when the residual magnetic field is large, that is, the third signal output by the second detection component 2 is greater than the second threshold, the processing unit will trigger a detection alarm to remind the operator that it is impossible to measure whether there is a leakage current risk at present, and the operator needs to re-debug.

[0063] In this embodiment, by setting the second threshold, it is possible to ensure that when the third signal is less than the second threshold, the processing unit uses the third signal to calculate the leakage current; when the third signal exceeds the second threshold, the processing unit will trigger a detection alarm, indicating that it is impossible to measure whether there is a leakage current risk at present, and the operator needs to re-debug to ensure the accuracy of the leakage current detected, thereby greatly improving the reliability of leakage current detection.

[0064] See also Figure 4 , Figure 4 This is a flow chart of a current detection method according to a fourth embodiment of the present invention. In one embodiment, determining whether a wire has a leakage current risk based on the load current and the leakage current includes the following steps:

[0065] S31, the processing unit determines whether the difference obtained by subtracting the product of the load current and the constant coefficient from the leakage current is less than a third threshold;

[0066] Before the test, a third preset requirement will be set in the software of the processing unit. The third preset requirement is the leakage current and load current calculated by the processing unit before. Substitute them into the calculation formula to determine whether the calculated value is less than the third threshold; the calculation formula is as follows: I2-k×I1

[0067] Among them, I1 is the load current, I2 is the leakage current, and k is a constant coefficient.

[0068] S32. When the difference obtained by subtracting the product of the load current and the constant coefficient from the leakage current is less than the third threshold, there is no leakage current risk in the wire; when the difference obtained by subtracting the product of the load current and the constant coefficient from the leakage current is greater than or equal to the third threshold, there is a leakage current risk in the wire, and a leakage alarm is triggered.

[0069] When the calculated value of I2-k×I1 is less than the third threshold, it indicates that there is no leakage current risk;

[0070] When the calculated value of I2-k×I1 is greater than or equal to the third threshold, it indicates that there is a leakage current risk, and the processing unit will trigger a leakage alarm to alert the operator.

[0071] Since there is an error in the leakage current measured by the second detection component 2, an operation is required to determine the exact leakage current situation of the wire. In this embodiment, an operation is performed and the operation value is compared with the preset value to determine whether there is a leakage current risk in the wire. Such a detection method can further improve the accuracy of the detection.

[0072] According to another aspect of the present invention, see Figure 5 and Figure 6 The present invention provides a current detection system 100. The current detection system 100 applies the above-mentioned current measurement method. The current detection system 100 includes a first detection component 1, a second detection component 2, and a processing unit. The first detection component 1 includes a first detection module 11 and a second detection module 12. The first detection module 11 is used to respond to the magnetic field generated by the conductor within a first frequency range and output a first signal. The second detection module 12 is used to respond to the magnetic field generated by the conductor within a second frequency range and output a second signal. The second detection component 2 includes a third detection module 21. The third detection module 21 is used to respond to the residual magnetic field of the conductor and output a third signal.

[0073] The processing unit is used to receive the first signal, the second signal and the third signal, and determine whether there is a leakage current risk in the wire.

[0074] Specifically, the first detection module 11 and the second detection module 12 have the same working magnetic field range. When the wire is energized, the first detection module 11 and the second detection module 12 simultaneously respond to the magnetic field generated by the wire within a certain frequency range, and output the first signal and the second signal respectively. The first detection module 11 can detect normally within the first frequency range, and the second detection module 12 can detect normally within the second frequency range; when the wire is powered off, there is still a residual magnetic field inside the wire, and the third detection module 21 will respond to the residual magnetic field of the wire and output a third signal; the processing unit receives the first signal, the second signal and the third signal, and the software in the processing unit is set with preset requirements. The processing unit determines which of the first signal and the second signal meets the preset requirements, and then selects the one that meets the requirements. The signal requested is obtained, and the load current of the wire is calculated through this signal. The processing unit also calculates the leakage current of the wire through the third signal. In fact, the leakage current obtained is an approximate value. In order to determine whether there is a leakage current risk in the wire, data processing is still required. Therefore, the processing unit collects the load current and the leakage current, and then calculates whether there is a leakage current risk in the wire through a preset calculation formula in the processing unit, thereby completing the leakage current detection. In this embodiment, the first detection module 11 and the second detection module 12 are set to measure the load current in different frequency ranges respectively to ensure the reliability of the load current. In this way, the current detection device can detect leakage current in various frequency ranges, thereby greatly improving the detection accuracy of the current detection system 100.

[0075] See also Figure 5 and Figure 6 In one embodiment, the first detection module 11 includes a first magnetic focusing ring 111 and a first magnetic resistance unit 112, the first magnetic focusing ring 111 forms a first air gap 111a, and the first magnetic resistance unit 112 is disposed in the first air gap 111a; the second detection module 12 includes a second magnetic focusing ring 121 and a second magnetic resistance unit 122, the second magnetic focusing ring 121 forms a second air gap 121a, and the second magnetic resistance unit 122 is disposed in the second air gap 121a; or

[0076] The first detection module 11 includes a first magnetic focusing ring 111, a first magnetic resistance unit 112 and a second magnetic resistance unit 122. The first magnetic focusing ring 111 forms a first air gap 111a and a second air gap 121a. The first magnetic resistance unit 112 is arranged in the first air gap 111a, and the second magnetic resistance unit 122 is arranged in the second air gap 121a. The second detection module 12 includes a second magnetic focusing ring 121.

[0077] Specifically, in the first scheme, the first detection module 11 and the second detection module 12 are independent of each other, so that the first detection module 11 and the second detection module 12 can be calibrated and tested separately, which simplifies the system integration and maintenance process. If one of the first detection module 11 and the second detection module 12 fails, it can be quickly verified which one has failed, which greatly improves maintenance efficiency; in the above-mentioned second scheme, the first magnetic resistance unit 112 and the second magnetic resistance unit 122 are respectively arranged in the first air gap 111a and the second air gap 121a of the first magnetic ring 111, so that multiple magnetic resistance units can share the same magnetic ring, and by optimizing the layout and algorithm, more efficient magnetic field detection can be achieved; and this design can make better use of space and reduce the overall size of the current detection system 100.

[0078] See also Figure 5 and Figure 6 Furthermore, the third detection module 21 includes a third magnetic focusing ring 211 and a third magnetic resistance unit 212. The third magnetic focusing ring 211 forms a receiving cavity 211a and a third air gap 211b that are interconnected. The third magnetic resistance unit 212 is arranged in the third air gap 211b, and the first detection module 11 and the second detection module 12 are arranged in the receiving cavity 211a. Through such an arrangement, the overall structure of the current detection system 100 can be reduced as much as possible, and the first detection module 11 and the second detection module 12 are concentrated in a larger third magnetic focusing ring 211, which is convenient for management and maintenance.

[0079] In one embodiment, the current detection system 100 further includes a fourth detection module, which is disposed around the conductor and responds to the magnetic field generated by the conductor within a third frequency range and outputs a fourth signal. The processing unit receives the fourth signal and calculates the load current of the conductor. In practice, the current detection system 100 further includes a fourth detection module that responds to the magnetic field generated by the conductor within a third frequency range and outputs the first signal. The third frequency range is a low-frequency range susceptible to 1 / f noise. Thus, the current detection system 100 performs leakage current detection within this low-frequency range, expanding the detectable range of the current detection system 100.

[0080] In one embodiment, the second frequency range is higher than the first frequency range. The first frequency range may be lower than 1 MHz, and the second frequency range may be higher than 1 MHz. Since the current frequency in the conductor is too high, it is easy to cause electromagnetic induction coupling. The coupling strength is high, which will cause the first detection module 11 to fail to measure normally. Therefore, it is necessary to provide a second detection module 12 suitable for high-frequency current to achieve normal measurement at high frequencies.

[0081] In one embodiment, the operating magnetic field range of the first detection component 1 is greater than the operating magnetic field range of the second detection component 2. By making the current in a portion of the conductor opposite to the current in the original conductor, the magnetic field generated by the conductor is partially offset by the magnetic field generated by the original conductor, indicating that the residual magnetic field is small. Therefore, it is necessary to set the operating magnetic field range of the second detection component 2 to a smaller range so that the second detection component 2 can respond to the residual magnetic field. This setting ensures that the second detection component 2 can normally respond to the residual magnetic field of the conductor.

[0082] According to another aspect of the present invention, an electronic device is provided. The electronic device includes the above-described current detection system 100, wherein the first detection module 11, the second detection module 12, and the third detection module 21 are all disposed near the conductive wire. Because the electronic device includes all implementations of all embodiments of the above-described current detection system 100, it has at least all the beneficial effects brought about by all the above-described implementations, and no further description is given here.

[0083] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformation made by utilizing the contents of the present invention's description and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A current measurement method, characterized in that: The current measurement method comprises the following steps: The first detection component responds to magnetic fields generated by the conductive wire within different frequency ranges, wherein the first detection component is provided with a first detection module and a second detection module having the same operating magnetic field range, and the first detection module and the second detection module have different normal response frequency ranges, and the second detection module can normally respond to a frequency range greater than the normal response frequency range of the first detection module, the first detection module outputs a first signal, and the second detection module outputs a second signal; the second detection component responds to the residual magnetic field generated by the conductive wire and outputs a third signal; A processing unit receives the first signal, the second signal, and the third signal, and determines whether the first signal is less than a first threshold; when the first signal is less than the first threshold, the processing unit determines the load current of the wire according to the first signal; when the first signal is greater than the first threshold, the processing unit determines the load current of the wire according to the second signal, and determines the leakage current of the wire according to the third signal; Whether the wire has a leakage current risk is determined by the load current and the leakage current.

2. The current measurement method according to claim 1, characterized in that: The processing unit determining the leakage current of the wire according to the third signal comprises the following steps: The processing unit determines whether the third signal is less than a second threshold; When the third signal is less than the second threshold, the processing unit determines the leakage current of the wire through the third signal; when the third signal is higher than the second threshold, a detection alarm is triggered.

3. The current measurement method according to claim 1, wherein: Determining whether the wire has a leakage current risk based on the load current and the leakage current includes the following steps: The processing unit determines whether a difference obtained by subtracting a product of the load current and a constant coefficient from the leakage current is less than a third threshold; When the difference obtained by subtracting the product of the load current and the constant coefficient from the leakage current is less than the third threshold, there is no leakage current risk for the wire; when the difference obtained by subtracting the product of the load current and the constant coefficient from the leakage current is greater than or equal to the third threshold, there is a leakage current risk for the wire, and a leakage alarm is triggered.

4. A current detection system, wherein the current detection system applies the current measurement method according to any one of claims 1 to 3, characterized in that: The invention comprises the first detection component, the second detection component and the processing unit, wherein the first detection component comprises a first detection module and a second detection module; the first detection module is used to respond to the magnetic field generated by the conductor within a first frequency range and output a first signal, and the second detection module is used to respond to the magnetic field generated by the conductor within a second frequency range and output a second signal; the second detection component comprises a third detection module, and the third detection module is used to respond to the residual magnetic field of the conductor and output a third signal; The processing unit is configured to receive the first signal, the second signal, and the third signal, and determine whether the wire has a leakage current risk.

5. The current detection system according to claim 4, characterized in that: The first detection module includes a first magnetic focusing ring and a first magnetic resistance unit, the first magnetic focusing ring forms a first air gap, and the first magnetic resistance unit is arranged in the first air gap; the second detection module includes a second magnetic focusing ring and a second magnetic resistance unit, the second magnetic focusing ring forms a second air gap, and the second magnetic resistance unit is arranged in the second air gap; or, The first detection module includes a first magnetic focusing ring, a first magnetic resistance unit and a second magnetic resistance unit. The first magnetic focusing ring forms a first air gap and a second air gap. The first magnetic resistance unit is arranged in the first air gap, and the second magnetic resistance unit is arranged in the second air gap. The second detection module includes a second magnetic focusing ring.

6. The current detection system according to claim 4, characterized in that: The current detection system also includes a fourth detection module, which is arranged around the wire. The fourth detection module responds to the magnetic field generated by the wire within a third frequency range and outputs a fourth signal; the processing unit receives the fourth signal and calculates the load current of the wire.

7. The current detection system according to any one of claims 4 to 6, characterized in that: The second frequency range is higher than the first frequency range.

8. The current detection system according to any one of claims 4 to 6, characterized in that: The operating magnetic field range of the first detection component is greater than the operating magnetic field range of the second detection component.

9. An electronic device, characterized in that: The electronic device includes the current detection system according to any one of claims 4 to 8, and the first detection module, the second detection module and the third detection module are all arranged close to the conductor.

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