CN117805674A - Switch micro-leakage current detection device - Google Patents
Switch micro-leakage current detection device Download PDFInfo
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- CN117805674A CN117805674A CN202311746208.3A CN202311746208A CN117805674A CN 117805674 A CN117805674 A CN 117805674A CN 202311746208 A CN202311746208 A CN 202311746208A CN 117805674 A CN117805674 A CN 117805674A
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- 238000004458 analytical method Methods 0.000 claims abstract description 9
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- 238000003199 nucleic acid amplification method Methods 0.000 claims description 8
- 230000005856 abnormality Effects 0.000 claims description 6
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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Abstract
The invention discloses a switch micro-leakage current detection device, which comprises a current detection circuit component and a control circuit component; the current detection circuit component comprises a micro-leakage current sensor, a differential amplifier and a sensing data processor, wherein the differential amplifier is in data connection with signals of the micro-leakage current sensor, and the sensing data processor is in data connection with the micro-leakage current sensor and processes and analyzes the sensing data after acquiring the sensing data to acquire a processing analysis result; the control circuit part specifically comprises a comparator and a trigger signal generator, wherein the comparator is used for comparing a processing analysis result with a preset current threshold value, generating a trigger signal according to the comparison result, and sending the trigger signal to the trigger signal generator when the processing analysis result exceeds the preset current threshold value, so as to complete the micro-leakage current detection device. The problem that the existing switch micro-leakage current detection mode is low in accuracy on one hand and cannot acquire a current leakage position on the other hand is solved.
Description
Technical Field
The invention relates to the technical field of switch micro-leakage current detection devices.
Background
With the widespread use of electric vehicles, safety of electric vehicles has become a focus of attention. In the electrical system of an electric vehicle, a switching micro-leakage current is an important potential safety hazard.
In the past, relays or fuses have been commonly used to detect micro leakage current, specifically:
(1) a relay: a relay is an electrical control device having one or more contacts for switching a circuit when an input signal reaches a certain threshold. The relay can be used for detecting micro leakage current, and the principle is that when the micro leakage current reaches a set value, the contact is closed or opened, so that the output circuit is controlled. The relay is generally used for controlling high-power equipment such as a motor, illumination and the like so as to cut off a power supply in time when micro-leakage current occurs and prevent damage or potential safety hazard caused by excessive current;
(2) a fuse: a fuse is a device for protecting an electrical circuit and is made of a wire or foil that heats and fuses to cut the circuit when the current exceeds its rated value. The fuse can be used for detecting micro leakage current, but has lower sensitivity and is only suitable for detecting serious current leakage. In addition, the fuse needs to be replaced after the circuit is cut off, so that the fuse is not suitable for detecting continuous micro-leakage current;
therefore, the conventional method has low accuracy, and cannot detect when the micro-leakage current is small, and cannot obtain the current leakage position, so that usability is limited.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description summary and in the title of the application, to avoid obscuring the purpose of this section, the description summary and the title of the invention, which should not be used to limit the scope of the invention.
The present invention has been made in view of the above-mentioned problems associated with the conventional switch micro-leakage current detection method.
Therefore, the technical problems solved by the invention are as follows: the problem that the existing switch micro-leakage current detection mode is low in accuracy on one hand and cannot acquire a current leakage position on the other hand is solved.
In order to solve the technical problems, the invention provides the following technical scheme: the detection device comprises a current detection circuit component and a control circuit component; the current detection circuit component comprises a micro-leakage current sensor, a differential amplifier and a sensing data processor, wherein the differential amplifier is in data connection with the micro-leakage current sensor and is used for amplifying a sensing signal, and the sensing data processor is in data connection with the micro-leakage current sensor and is used for processing and analyzing the sensing data after acquiring the sensing data to acquire a processing and analyzing result; the control circuit component is in signal data connection with the sensing data processor and specifically comprises a comparator and a trigger signal generator, wherein the comparator is used for comparing a processing analysis result with a preset current threshold value, generating a trigger signal according to the comparison result, and sending the trigger signal to the trigger signal generator when the processing analysis result exceeds the preset current threshold value, so as to complete the micro-leakage current detection device.
As a preferred embodiment of the switching micro leakage current detection device of the present invention, the following applies: the micro leakage current sensor is arranged at the port of the switch circuit, specifically a current flow sensor, and is used for monitoring the current flow at the port of the switch circuit in real time within rated time.
As a preferred embodiment of the switching micro leakage current detection device of the present invention, the following applies: after the differential amplifier obtains the current flow, current amplification is carried out according to the historical current flow at the port of the switch circuit, specifically: when the historical current flow is not higher than 20A, the amplification factor is 3.5 times; when the historical current flow is higher than 20A and not higher than 50A, the amplification factor is 5.5 times; when the historical current flow is higher than 50A, the magnification is 7.5 times.
As a preferred embodiment of the switching micro leakage current detection device of the present invention, the following applies: the sensing data processor acquires the amplified current flows and then processes and analyzes the amplified current flows, and the method specifically comprises the following steps of: s1: monitoring the current flow a passing through the rated time in real time; s2: constructing a flow loss model, and sequentially incorporating the current flow a into the flow loss model according to a time sequence to generate flow loss function values; s3: in a two-dimensional plane coordinate system, taking the rear end value of each rated time intercepted in time sequence as an abscissa, taking the flow loss function value as an ordinate to obtain flow loss points, and connecting a smooth curve with each flow loss point to form a flow loss curve; s4: obtaining a maximum derivative value and a minimum derivative value of the flow loss curve; s5: and acquiring a difference value of the maximum derivative value and the minimum derivative value, judging whether an abnormality exists at a port based on whether the difference value reaches a set loss curve threshold value, and starting the comparator after judging that the abnormality exists, so as to synchronously define the micro-leakage current leakage point.
As a preferred embodiment of the switching micro leakage current detection device of the present invention, the following applies: the constructed flow loss model is specifically as follows:
where α is a flow loss function value, t is a rated time(s), a is a current flow (a), 2/3 is a loss adjustment function, and xdx is an integral operation function.
As a preferred embodiment of the switching micro leakage current detection device of the present invention, the following applies: the loss curve threshold is defined as ln2.
As a preferred embodiment of the switching micro leakage current detection device of the present invention, the following applies: the preset current threshold value is determined in real time according to the flow loss model, and specifically comprises the following steps:
wherein delta is a preset current threshold value, alpha is a flow loss function value, a is a current flow, 2/3 is a loss adjustment function, D is a derivative value of each point of a flow loss curve, N is the number of the points of the flow loss curve, and xdx is an integral operation function.
The micro leakage current is detected by adopting the combination of the micro leakage current sensor and the differential amplifier, the processed sensing data is compared in real time through the control circuit, and the trigger signal is generated.
Compared with the prior art, the invention has the following advantages:
1. the combination of the micro-leakage current sensor and the differential amplifier is adopted, so that the precision and the reliability of micro-leakage current detection are improved.
2. The output signal of the sensing data processor is compared with a preset current threshold value in real time through the control circuit, so that detection is more accurate.
3. The safety of an electric system of the electric vehicle is effectively guaranteed, and the problem that the existing switch micro-leakage current detection mode is low in accuracy on one hand and cannot acquire the current leakage position on the other hand is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
fig. 1 is a system component diagram of a switch micro-leakage current detection device provided by the invention.
FIG. 2 is a flow chart of a method for processing and analyzing each amplified current flow obtained by the sensor data processor.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
The existing switch micro-leakage current detection mode is low in precision on one hand, cannot detect when the micro-leakage current is small, cannot acquire the current leakage position on the other hand, and is limited in usability.
Accordingly, referring to fig. 1, the present invention provides a switch micro-leakage current detection device, the detection device includes a current detection circuit part and a control circuit part;
the current detection circuit component comprises a micro-leakage current sensor, a differential amplifier and a sensing data processor, wherein the differential amplifier is in data connection with the micro-leakage current sensor and is used for amplifying a sensing signal, and the sensing data processor is in data connection with the micro-leakage current sensor and is used for processing and analyzing the sensing data after acquiring the sensing data to acquire a processing and analyzing result;
the control circuit component is in signal data connection with the sensing data processor and specifically comprises a comparator and a trigger signal generator, wherein the comparator is used for comparing a processing analysis result with a preset current threshold value, generating a trigger signal according to the comparison result, and sending the trigger signal to the trigger signal generator when the processing analysis result exceeds the preset current threshold value, so as to complete the micro-leakage current detection device.
Specifically, the micro-leakage current sensor is arranged at the port of the switch circuit, specifically a current flow sensor, and is used for monitoring the current flow at the port of the switch circuit in real time within the rated time.
It should be noted that, the current flow sensor is a direct application of the existing conventional components, and redundant description is not made here.
Further, after the differential amplifier obtains the current flow, current amplification is performed according to the historical current flow at the port of the switch circuit, which specifically comprises the following steps:
when the historical current flow is not higher than 20A, the amplification factor is 3.5 times;
when the historical current flow is higher than 20A and not higher than 50A, the amplification factor is 5.5 times;
when the historical current flow is higher than 50A, the magnification is 7.5 times.
It should be noted that, the historical current flow is obtained according to the statistics result of the big data.
Still further, referring to fig. 2, the sensor data processor acquires the amplified current flows and then processes and analyzes the amplified current flows, and specifically includes the following steps:
s1: monitoring the current flow a passing through the rated time in real time;
s2: constructing a flow loss model, sequentially incorporating each current flow a into the flow loss model according to a time sequence, and generating each flow loss function value;
s3: in a two-dimensional plane coordinate system, acquiring flow loss points by taking the rear end value of each rated time intercepted in time sequence as an abscissa and taking a flow loss function value as an ordinate, and connecting the flow loss points by a smooth curve to form a flow loss curve;
s4: obtaining a maximum derivative value and a minimum derivative value of a flow loss curve;
s5: and acquiring a difference value of the maximum derivative value and the minimum derivative value, judging whether an abnormality exists at the port based on whether the difference value reaches a set loss curve threshold value, and starting a comparator after judging that the abnormality exists, wherein the comparator is synchronously defined as a micro-leakage current leakage point.
Further, the constructed flow loss model is specifically:
where α is a flow loss function value, t is a rated time(s), a is a current flow (a), 2/3 is a loss adjustment function, and xdx is an integral operation function.
Specifically, the loss curve threshold is defined as ln2.
The additional requirement is that the preset current threshold value is determined in real time according to the flow loss model, specifically:
wherein delta is a preset current threshold value, alpha is a flow loss function value, a is a current flow, 2/3 is a loss adjustment function, D is a derivative value of each point of a flow loss curve, N is the number of the points of the flow loss curve, and xdx is an integral operation function.
Compared with the prior art, the invention has the following advantages:
1. the combination of the micro-leakage current sensor and the differential amplifier is adopted, so that the precision and the reliability of micro-leakage current detection are improved.
2. The output signal of the sensing data processor is compared with a preset current threshold value in real time through the control circuit, so that detection is more accurate.
3. The safety of an electric system of the electric vehicle is effectively guaranteed, and the problem that the existing switch micro-leakage current detection mode is low in accuracy on one hand and cannot acquire the current leakage position on the other hand is solved.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (7)
1. The utility model provides a little leakage current detection device of switch which characterized in that: the detecting device comprises a current detecting circuit part and a control circuit part;
the current detection circuit component comprises a micro-leakage current sensor, a differential amplifier and a sensing data processor, wherein the differential amplifier is in data connection with the micro-leakage current sensor and is used for amplifying a sensing signal, and the sensing data processor is in data connection with the micro-leakage current sensor and is used for processing and analyzing the sensing data after acquiring the sensing data to acquire a processing and analyzing result;
the control circuit component is in signal data connection with the sensing data processor and specifically comprises a comparator and a trigger signal generator, wherein the comparator is used for comparing a processing analysis result with a preset current threshold value, generating a trigger signal according to the comparison result, and sending the trigger signal to the trigger signal generator when the processing analysis result exceeds the preset current threshold value, so as to complete the micro-leakage current detection device.
2. The switching micro-leakage current detection apparatus according to claim 1, wherein: the micro leakage current sensor is arranged at the port of the switch circuit, specifically a current flow sensor, and is used for monitoring the current flow at the port of the switch circuit in real time within rated time.
3. The device for detecting micro-leakage current of a switch according to claim 2, wherein the differential amplifier amplifies the current according to the historical current at the port of the switch circuit after obtaining the current, specifically:
when the historical current flow is not higher than 20A, the amplification factor is 3.5 times;
when the historical current flow is higher than 20A and not higher than 50A, the amplification factor is 5.5 times;
when the historical current flow is higher than 50A, the magnification is 7.5 times.
4. The switching micro-leakage current detection device according to claim 3, wherein the sensor data processor obtains the amplified current flows and then processes and analyzes the amplified current flows, and the method specifically comprises the following steps:
s1: monitoring the current flow a passing through the rated time in real time;
s2: constructing a flow loss model, and sequentially incorporating the current flow a into the flow loss model according to a time sequence to generate flow loss function values;
s3: in a two-dimensional plane coordinate system, taking the rear end value of each rated time intercepted in time sequence as an abscissa, taking the flow loss function value as an ordinate to obtain flow loss points, and connecting a smooth curve with each flow loss point to form a flow loss curve;
s4: obtaining a maximum derivative value and a minimum derivative value of the flow loss curve;
s5: and acquiring a difference value of the maximum derivative value and the minimum derivative value, judging whether an abnormality exists at a port based on whether the difference value reaches a set loss curve threshold value, and starting the comparator after judging that the abnormality exists, so as to synchronously define the micro-leakage current leakage point.
5. The switching micro-leakage current detection apparatus according to claim 4, wherein: the constructed flow loss model is specifically as follows:
where α is a flow loss function value, t is a rated time(s), a is a current flow (a), 2/3 is a loss adjustment function, and xdx is an integral operation function.
6. The switching micro-leakage current detection apparatus according to claim 5, wherein: the loss curve threshold is defined as ln2.
7. The device for detecting micro-leakage current according to claim 6, wherein the preset current threshold value is determined in real time according to the flow loss model, specifically:
wherein delta is a preset current threshold value, alpha is a flow loss function value, a is a current flow, 2/3 is a loss adjustment function, D is a derivative value of each point of a flow loss curve, N is the number of the points of the flow loss curve, and xdx is an integral operation function.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311746208.3A CN117805674A (en) | 2023-12-19 | 2023-12-19 | Switch micro-leakage current detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311746208.3A CN117805674A (en) | 2023-12-19 | 2023-12-19 | Switch micro-leakage current detection device |
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| Publication Number | Publication Date |
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| CN117805674A true CN117805674A (en) | 2024-04-02 |
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| CN202311746208.3A Pending CN117805674A (en) | 2023-12-19 | 2023-12-19 | Switch micro-leakage current detection device |
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- 2023-12-19 CN CN202311746208.3A patent/CN117805674A/en active Pending
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