Current measurement method, current detection system and electronic equipment

Abstract

The invention discloses a current measurement method, a current detection system and electronic equipment, and relates to the technical field of current detection, and the current measurement method comprises the following steps: 1, responding to a magnetic field generated when different currents pass through a wire through a first detection assembly, and outputting a first signal and a second signal; responding to a residual magnetic field generated by the wire through a second detection assembly, and outputting a third signal; 2, the processing unit receives the first signal, the second signal and the third signal, the processing unit determines the load current of the wire through the first signal or the second signal meeting the preset requirement, and the processing unit determines the leakage current of the wire through the third signal; and 3, judging whether the lead has a current leakage risk or not through the load current and the leakage current. The load current obtained by the detection method is accurate and reliable, and whether the lead has the risk of leakage current is determined accurately and reliably, so that the reliability of the measurement result of the current detection method is improved.

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 electronic equipment. Background Art

[0002] Current sensor is a device for detecting current, which is generally used in actual current measurement and protection systems, such as photovoltaic, wind power, electricity, smart grid, railway electromechanical, aerospace, new energy vehicles and other fields. As the main detection element, current sensor plays a vital role in ensuring the safety and stability of the system. In order to ensure the safe and reliable operation of these products, it is necessary to detect and monitor their current, leakage current and other indicators in real time.

[0003] At present, the existing technology monitoring circuit generally installs 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 realize different detection functions to confirm whether there is a leakage current risk in the equipment. However, such detection method can only be performed within a specific magnetic field range. If the magnetic field generated by the working current exceeds the magnetic field range, such detection method cannot guarantee the reliability of the detection result. 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, the present invention provides a current measurement method, the current measurement method comprising the following steps:

[0006] The first detection component responds to the magnetic field generated when different currents pass through the wire and outputs a first signal and a second signal; the second detection component responds to the residual magnetic field generated by the wire and outputs a third signal;

[0007] The processing unit receives the first signal, the second signal and the third signal, the processing unit determines the load current of the wire through the first signal or the second signal that meets the preset requirements, and the processing unit determines the leakage current of the wire through 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 the first signal or the second signal that meets the preset requirements, including the following steps:

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

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

[0012] In one embodiment, the processing unit determines the load current of the wire through the second signal, comprising the following steps:

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

[0014] When the signal is lower than a second threshold, the processing unit determines the load current of the conductor through the second signal; when the second signal is higher than the second threshold, an out-of-range alarm is triggered.

[0015] In one embodiment, the processing unit determines the leakage current of the wire through the third signal, comprising the following steps:

[0016] The processing unit determines whether the third signal is less than a third threshold;

[0017] When the third signal is lower than the third threshold, the processing unit determines the leakage current of the wire through the third signal; when the third signal is higher than the third threshold, a detection alarm is triggered.

[0018] In one embodiment, judging whether the wire has a leakage current risk by using the load current and the leakage current comprises the following steps:

[0019] 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 fourth threshold;

[0020] When the difference obtained by subtracting the product of the load current and the constant coefficient from the leakage current is less than the fourth 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 fourth threshold, there is a leakage current risk for the wire, triggering a leakage alarm.

[0021] According to another aspect of the present invention, the present invention further provides a current detection system, the current detection system applies the above-mentioned current measurement method, comprises the first detection component, the second detection component and the processing unit, 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 when the first current passes through the wire, and output a first signal; the second detection module is used to respond to the magnetic field generated when the second current passes through the wire, and output a second signal; the second detection component comprises the third detection module, the third detection module is used to respond to the residual magnetic field generated by the wire, and output a third signal;

[0022] 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.

[0023] 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, and 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,

[0024] 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.

[0025] In one embodiment, the residual magnetic field range generated by the wire is smaller than the magnetic field range generated when the wire passes the first current, and the magnetic field range generated by the wire when the first current passes is smaller than the magnetic field range generated when the wire passes the second current.

[0026] In one embodiment, the first detection module, the second detection module and the third detection module all adopt a Wheatstone bridge structure.

[0027] According to another aspect of the present invention, the present invention further provides an electronic device, the electronic device comprising the above-mentioned current detection system, the first detection module, the second detection module and the third detection module are all arranged close to the wire.

[0028] In the above scheme, the current measurement method includes the following steps:

[0029] The first detection component responds to the magnetic field generated when different currents pass through the wire and outputs a first signal and a second signal; the second detection component responds to the residual magnetic field generated by the wire and outputs a third signal;

[0030] The processing unit receives the first signal, the second signal and the third signal, the processing unit determines the load current of the wire through the first signal or the second signal that meets the preset requirements, and the processing unit determines the leakage current of the wire through the third signal;

[0031] Use the load current and leakage current to determine whether the wire has leakage current risk.

[0032] Specifically, the first detection component responds to the magnetic field generated when different currents pass through the wire, and outputs the first signal and the second signal. In fact, the first detection component is provided with two detection units with different working magnetic field ranges. When different currents pass through the wire, different magnetic fields will be generated, so that 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 the leakage current, and then calculates whether there is a leakage current risk in the conductor through a calculation formula preset in the processing unit, thereby completing the leakage current detection; the present invention uses two detection units in the first detection component, and the magnetic field ranges in which the two detection units can respond normally are different. In this way, when different currents pass through the conductor to generate different magnetic fields, no matter which magnetic field range, there will always be one of the two detection units that can respond normally, so that the load current obtained can ensure that the detection result is accurate and reliable. Therefore, the final result of whether the conductor 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

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0034] Figure 1 Schematic diagram of the flow of the current detection method according to the first embodiment of the present invention;

[0035] Figure 2 is a flow chart of a current detection method according to a second embodiment of the present invention;

[0036] Figure 3 is a schematic flow chart of a current detection method according to a third embodiment of the present invention;

[0037] Figure 4 is a schematic flow chart of a current detection method according to a fourth embodiment of the present invention;

[0038] Figure 5 is a schematic flow chart of a current detection method according to a fifth embodiment of the present invention;

[0039] Figure 6 A schematic diagram of the structure of an embodiment of a current detection system provided by the present invention;

[0040] Figure 7 This is a schematic structural diagram of another embodiment of the current detection system provided by the present invention.

[0041] Description of Figure Numbers:

[0042] 100. Current detection system; 1. First detection component; 11. First detection module; 12. Second detection module; 111. First magnetic focusing ring; 112. First magnetic resistance unit; 111a. First air gap; 121. Second magnetic focusing ring; 122. Second magnetic resistance unit; 121a. Second air gap; 2. Second detection component; 21. Third detection module; 211. Third magnetic focusing ring; 212. Third magnetic resistance unit; 211a. Accommodating cavity; 211b. Third air gap.

[0043] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0045] 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 in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0046] 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 used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the 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 contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0047] To achieve the above purpose, see Figure 1 , Figure 1 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, the present invention provides a current measurement method, which includes the following steps:

[0048] S1, responding to the magnetic field generated when different currents pass through the wire through the first detection component 1, and outputting a first signal and a second signal; responding to the residual magnetic field generated by the wire through the second detection component 2, and outputting a third signal;

[0049] When different currents pass through the wire, the wire will generate different magnetic fields. 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 a first detection module 11 and a second detection module 12 with two different working magnetic field ranges. The first detection module 11 and the second detection module 12 can both adopt tunnel magnetoresistance 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 magnetoresistance sensor can also adopt a Wheatstone bridge structure. When the tunnel magnetoresistance sensor is When the resistance changes due to the change of magnetic field strength, 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 magnetoresistance sensor, thereby outputting a voltage signal. Both structures can be used in the 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 respectively, that is, the first signal and the second signal; 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, and 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.

[0050] S2, the processing unit receives the first signal, the second signal and the third signal, the processing unit determines the load current of the wire through the first signal or the second signal that meets the preset requirements, and the processing unit determines the leakage current of the wire through the third signal;

[0051] 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 and 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 one, which may deviate from the actual leakage current situation. In order to determine whether the wire has a leakage current risk, further data processing is required.

[0052] S3. Determine whether the wire has leakage current risk based on load current and leakage current.

[0053] 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.

[0054] In this embodiment, the first detection module 11 and the second detection module 12 in the first detection component 1 have different magnetic field ranges to which the first detection module 11 and the second detection module 12 can normally respond. In this way, when different currents pass through the wire, the wire will generate different magnetic fields. No matter which current generates the magnetic field, 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 result of the current detection method.

[0055] See also Figure 2 , Figure 2 1 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:

[0056] S21, the processing unit determines whether the first signal is lower than a first threshold;

[0057] 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.

[0058] S22. When the first signal is lower than the first threshold, the processing unit determines the load current of the conductor through the first signal; when the first signal is higher than the first threshold, the processing unit determines the load current of the conductor through the second signal.

[0059] Both the first detection module 11 and the second detection module 12 can change with the change of the magnetic field generated by the wire, but the magnetic field ranges of the normal responses of the first detection module 11 and the second detection module 12 are different. The magnetic field range to which the second detection module 12 can normally respond is larger than the magnetic field range to which the first detection module 11 normally responds. When the magnetic field 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 value; the second detection module 12 will also respond to the magnetic field of the wire and output a second signal. Since the current magnetic field is not within the magnetic field range of the normal response of the second detection module 12, the second signal obtained in this way 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 magnetic field is too high, exceeding the magnetic field 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 magnetic field is within the magnetic field 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.

[0060] 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.

[0061] See also Figure 3 , Figure 3 1 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 load current of the conductor according to the second signal, including the following steps:

[0062] S23, the processing unit determines whether the second signal is lower than a second threshold;

[0063] Before the detection, a second preset requirement is set in the software in the processing unit, wherein the preset requirement is whether the second signal received by the processing unit is smaller than a second threshold.

[0064] S24. When the signal is lower than the second threshold, the processing unit determines the load current of the conductor through the second signal; when the second signal is higher than the second threshold, an out-of-range alarm is triggered.

[0065] When the magnetic field is within the magnetic field range to which the second detection module 12 normally responds, the second signal output by the second detection module 12 in response to the magnetic field of the conductor is highly reliable, and the processing unit will calculate a reliable load current through the second signal; when the magnetic field exceeds the magnetic field range to which the second detection module 12 normally responds, the second signal output by the second detection module 12 in response to the magnetic field of the conductor will exceed the second threshold, and the processing unit will trigger an out-of-range alarm, reminding the operator that the load current cannot be measured and that the operator needs to re-debug.

[0066] In this embodiment, by setting the second threshold, it can be ensured that when the second signal is less than the second threshold, the processing unit uses the second signal to calculate the load current; when the second signal exceeds the second threshold, the processing unit will trigger an out-of-range alarm, indicating that it is impossible to measure whether there is a load current risk at present, and the operator is required to re-debug to ensure the accuracy of the detected load current, which can further improve the detection reliability of the load current.

[0067] See also Figure 4 , Figure 4 1 is a flow chart of a current detection method according to a fourth embodiment of the present invention. In one embodiment, the processing unit determines the leakage current of the conductor through the third signal, including the following steps:

[0068] S25, the processing unit determines whether the third signal is less than a third threshold;

[0069] Before the detection, a third 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 a third threshold.

[0070] S26. When the third signal is lower than the third threshold, the processing unit determines the leakage current of the wire through the third signal; when the third signal is higher than the third threshold, a detection alarm is triggered.

[0071] The second detection component 2 can change within its rated working magnetic field range as the magnetic field generated by the conductor changes. 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 third threshold, the processing unit determines 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 third 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.

[0072] In this embodiment, by setting the third threshold, it is possible to ensure that when the third signal is less than the third threshold, the processing unit uses the third signal to calculate the leakage current; when the third signal exceeds the third 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 is required to re-debug to ensure the accuracy of the leakage current detected, thereby greatly improving the reliability of leakage current detection.

[0073] See also Figure 5 , Figure 5 1 is a flow chart of a current detection method according to a fifth embodiment of the present invention. In one embodiment, judging whether a wire has a leakage current risk by using a load current and a leakage current includes the following steps:

[0074] 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 fourth threshold;

[0075] Before the test, a fourth preset requirement will be set in the software in the processing unit, where the fourth preset requirement is the leakage current and load current calculated by the processing unit before, which are substituted into the calculation formula to determine whether the calculated value is less than the fourth threshold value; the calculation formula is as follows: I2-k×I1

[0076] Among them, I1 is the load current, I2 is the leakage current, and k is a constant coefficient.

[0077] 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 fourth 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 fourth threshold, there is a leakage current risk in the wire, triggering a leakage alarm.

[0078] When the calculated value of I2-k×I1 is less than the fourth threshold, it indicates that there is no leakage current risk;

[0079] When the calculated value of I2-k×I1 is greater than or equal to the fourth threshold, it indicates that there is a leakage current risk, and the processing unit will trigger a leakage alarm to alert the operator.

[0080] 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 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.

[0081] According to another aspect of the present invention, see Figure 6 or Figure 7The present invention also proposes a current detection system 100. The current detection system 100 applies the above-mentioned current measurement method, and 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 when the wire passes through the first current, and output a first signal; the second detection module 12 is used to respond to the magnetic field generated when the wire passes through the second current, and output a second signal; the second detection component 2 includes a third detection module 21, and the third detection module 21 is used to respond to the residual magnetic field generated by the wire and output a third signal;

[0082] 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.

[0083] Specifically, the working magnetic field ranges of the first detection module 11 and the second detection module 12 are different. When different currents pass through the wire, different magnetic fields will be generated. The first detection module 11 and the second detection module 12 respond to the magnetic field generated by the wire at the same time and output the first signal and the second signal respectively. The first detection module 11 can normally detect in the magnetic field generated when the wire passes through the first current, and the second detection module 12 can normally detect in the magnetic field generated when the wire passes through the second current; 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 preset requirements. The required signal is used, 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 the wire has a leakage current risk, data processing is still required. Therefore, the processing unit collects the load current and the leakage current, and then calculates whether the wire has a leakage current risk 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 respectively measure the load current within the magnetic field range generated when the wire passes through different currents to ensure the reliability of the load current. In this way, the current detection device can perform leakage current detection within the magnetic field range generated when the wire passes through different currents, thereby greatly improving the detection accuracy of the current detection system 100.

[0084] See also Figure 6 or Figure 7In 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 arranged 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 arranged in the second air gap 121a; or,

[0085] 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 is formed with 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.

[0086] 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 the 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 focusing ring 111, so that multiple magnetic resistance units can share the same magnetic focusing ring, and more efficient magnetic field detection can be achieved by optimizing the layout and algorithm; and this design can make better use of space and reduce the overall size of the current detection system 100.

[0087] In one embodiment, the residual magnetic field range generated by the wire is smaller than the magnetic field range generated when the wire passes through the first current, and the magnetic field range generated when the wire passes through the first current is smaller than the magnetic field range generated when the wire passes through the second current. In order to ensure that the first detection module 11 and the second detection module 12 can detect load currents with different magnetic field ranges, the magnetic field range generated when the wire passes through the first current is set to be smaller than the magnetic field range generated when the wire passes through the second current, thereby ensuring that the first detection module 11 and the second detection module 12 can detect load currents with different magnetic field ranges.

[0088] In one embodiment, the first detection module 11, the second detection module 12 and the third detection module 21 all adopt a Wheatstone bridge structure. The first detection module 11, the second detection module 12 and the third detection module 21 are all tunnel magnetoresistance sensors. The Wheatstone bridge structure can amplify small changes in sensor resistance, thereby improving the sensitivity of the entire system. When the tunnel magnetoresistance sensor is used as an arm of the bridge, its resistance change will be converted into a change in voltage output. This voltage change is easier to be detected and processed by subsequent circuits. The Wheatstone bridge can achieve temperature compensation. The use of the Wheatstone bridge structure can make the output signal more linear and have good common-mode suppression capabilities. The use of the Wheatstone bridge structure can improve the stability of the entire system.

[0089] According to another aspect of the present invention, the present invention further provides an electronic device, the electronic device includes the above-mentioned current detection system, and the first detection module, the second detection module and the third detection module are all arranged close to the wire. Since the electronic device includes all implementation methods of all embodiments of the above-mentioned current detection system 100, it at least has all the beneficial effects brought by all the above-mentioned implementation methods, which will not be repeated here one by one.

[0090] The above are only exemplary embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are 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 the magnetic field generated when different currents pass through the wire and outputs a first signal and a second signal; the second detection component responds to the residual magnetic field generated by the wire and outputs a third signal; The processing unit receives the first signal, the second signal and the third signal, the processing unit determines the load current of the wire through the first signal or the second signal that meets the preset requirements, and the processing unit determines the leakage current of the wire through the third signal; It is determined whether the wire has a leakage current risk based on the load current and the leakage current.

2. The current measurement method according to claim 1, characterized in that: The processing unit determines the load current of the conductor according to the first signal or the second signal that meets the preset requirements, including the following steps: The processing unit determines whether the first signal is lower than a first threshold; When the first signal is lower than the first threshold, the processing unit determines the load current of the conductor through the first signal; when the first signal is higher than the first threshold, the processing unit determines the load current of the conductor through the second signal.

3. The current measurement method according to claim 2, characterized in that: The processing unit determines the load current of the wire through the second signal, comprising the following steps: The processing unit determines whether the second signal is lower than a second threshold; When the signal is lower than a second threshold, the processing unit determines the load current of the conductor through the second signal; when the second signal is higher than the second threshold, an out-of-range alarm is triggered.

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

5. The current measurement method according to claim 1, characterized in that: The determining whether the wire has a leakage current risk by using the load current and the leakage current comprises 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 fourth 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 fourth 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 fourth threshold, there is a leakage current risk for the wire, triggering a leakage alarm.

6. A current detection system, wherein the current detection system applies the current measurement method according to any one of claims 1 to 5, characterized in that: The method 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, and the first detection module is used to respond to the magnetic field generated when the first current passes through the wire and output a first signal; The second detection module is used to respond to the magnetic field generated when the second current passes through the wire and output a second signal; the second detection component includes the third detection module, and the third detection module is used to respond to the residual magnetic field generated by the wire and output a third signal; 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.

7. The current detection system according to claim 6, 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, and 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.

8. The current detection system according to any one of claims 6 or 7, characterized in that: The residual magnetic field range generated by the wire is smaller than the magnetic field range generated by the wire when the first current passes through it, and the magnetic field range generated by the wire when the first current passes through it is smaller than the magnetic field range generated by the wire when the second current passes through it.

9. The current detection system according to any one of claims 6 or 7, characterized in that: The first detection module, the second detection module and the third detection module all adopt a Wheatstone bridge structure.

10. An electronic device, characterized in that: The electronic device comprises the current detection system according to any one of claims 6 to 9, 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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