A short circuit detection method and implementation device for preventing misjudgment

Abstract

This invention proposes a short-circuit detection method and implementation device to prevent false alarms, addressing the technical problem that the switching between main and backup power supplies in industrial alarm control devices and fluctuations in on-site power supply voltage can affect the accuracy of existing short-circuit detection methods. This invention collects information on delayed detection time, downstream circuit status, number of consecutive short circuits in the downstream circuit, detection cycle of the downstream circuit, and main power supply status. By coordinating the parameters of delayed detection time, downstream circuit status, number of consecutive short circuits in the downstream circuit, and detection cycle under different main power supply states, it achieves accurate short-circuit detection and handling, effectively filtering out voltage fluctuations from the main power supply, backup power supply, and other sources. This invention can accurately determine the short-circuit condition of the circuit to be tested and promptly protect the safety of personnel and property on-site through emergency measures such as powering off downstream equipment and transmitting abnormal information to the platform.

Description

Technical Field

[0001] This invention relates to the technical field of industrial alarm control related devices, and in particular to a short-circuit detection method and implementation device for preventing false judgments. Background Technology

[0002] With the development of electronic instruments and meters, their safety has become a major concern, especially since the reliability of industrial instruments and equipment directly affects personal and property safety. The accuracy of short-circuit detection in industrial instruments directly impacts the effectiveness of emergency response measures in handling on-site problems. However, certain instrument operations can lead to misjudgments, and complex power supply environments can also complicate short-circuit detection. For example, in industrial alarm control devices, the switching between main and backup power supplies and fluctuations in the on-site power supply voltage can all affect the accuracy of short-circuit detection.

[0003] Existing short-circuit detection and shutdown methods mostly rely on hardware to set thresholds, such as those involving fuses and MOSFET circuits. While this approach is simple to implement, it lacks flexibility and is prone to misjudging certain special situations, such as fluctuations in power supply voltage, leading to erroneous equipment shutdown.

[0004] Patent application number 202011101518.6 discloses a method for detecting DC short-circuit faults in MMC-HVDC based on transient energy. This method constructs a vector based on the transient energy of the bridge arm capacitors and DC inductors of the MMC-HVDC, and determines the fault based on changes in this vector: when the change in the transient energy vector exceeds a threshold, detection is initiated; if the interval location criterion is greater than a set value, the fault is determined to occur within the interval, otherwise it is outside the interval; for the sending station, if the fault line selection criterion for a certain line is greater than a set value, the line is determined to have a fault, otherwise no fault has occurred; if the DC short-circuit fault identification criterion for that line is greater than a set value, a DC short-circuit fault is determined to have occurred, otherwise it is a power fluctuation or lightning strike fault; for the receiving station, the situation is reversed compared to the sending station. This invention can detect faults and determine their location within 1 ms or even less after a fault occurs. However, the above invention has limitations. The detection method is mainly used for fault diagnosis of DC power grids and is not applicable to conventional industrial instruments. First, the hardware on which the transient energy construction theory described depends is not universal. Second, the parameter values ​​required in the detection method are highly correlated and cannot be flexibly applied to other fields or equipment. Summary of the Invention

[0005] To address the technical problem that switching between main and backup power supplies and fluctuations in on-site power supply voltage can affect the accuracy of existing short-circuit detection methods, this invention proposes a short-circuit detection method and implementation device to prevent false judgments. It fully considers voltage fluctuations caused by various power supplies of the equipment and the on-site environment, filters out various fluctuations through software, accurately judges the short-circuit status of the circuit to be judged, and protects the personal and property safety on-site by timely emergency measures such as powering off downstream equipment and transmitting abnormal information to the platform.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a short-circuit detection method to prevent false judgments, which collects information such as delayed detection time, the state of the subsequent circuit, the number of consecutive short circuits in the subsequent circuit, the detection cycle of the subsequent circuit, and the state of the main power supply. By coordinating the detection of parameters such as delayed detection time, the state of the subsequent circuit, the number of consecutive short circuits in the subsequent circuit, and the detection cycle of the subsequent circuit under different main power supply states, accurate judgment and processing of short circuits are achieved, so as to effectively filter out voltage fluctuations of the main power supply, backup power supply, and other voltages.

[0007] Preferably, the status of the subsequent circuit after the main power supply status judgment is determined according to the equipment voltage, including the parameter values ​​of the main power minimum threshold, the number of consecutive main power detections, the median filtering level, and the detection cycle.

[0008] Preferably, the main power supply voltage value is acquired periodically according to the detection cycle, and the main power supply voltage value is filtered in multiple stages according to the median filtering level. It is determined whether the filtered main power supply voltage value is lower than the minimum threshold of the main power supply. If it is, the main power supply is faulty; otherwise, the main power supply is normal.

[0009] Preferably, if the main power supply fails at least once but less than N times in N consecutive tests, the current main power supply status is main power fluctuation; if the main power supply fails in all N consecutive tests, the current main power supply status is main power failure; if the main power supply is normal in all N consecutive tests, the current main power supply status is main power normal.

[0010] Preferably, the delayed detection time is the time during which short-circuit detection and processing are delayed when a main power fluctuation is detected. The delayed detection time needs to be determined by monitoring the impact of on-site voltage fluctuations on the main power voltage and monitoring the main power voltage during the main power / backup power switching process.

[0011] The status of the subsequent circuit is implemented by hardware, which reads the high and low levels of a specified IO of the microcontroller to determine the short circuit status of the subsequent circuit, and uses a comparator to compare the voltage of the subsequent circuit with a specified voltage to generate high and low levels to indicate the on / off state of the subsequent circuit.

[0012] The number of consecutive short circuits in the subsequent circuit refers to the number of times the state of the subsequent circuit is determined when the main power supply is in a fault or fluctuating state.

[0013] The detection cycle of the subsequent circuit is the time interval for actively reading the state of the subsequent circuit.

[0014] Preferably, the detection cycle is determined based on the larger value between the microcontroller's AD conversion speed and the software's operating capability.

[0015] The median filtering level was determined based on multiple experiments, ensuring that the collected values ​​do not show significant jumps after multiple consecutive comparisons of the filtered values.

[0016] A power sampling circuit is built by resistor voltage divider. The power supply voltage is obtained by microcontroller. When a tolerable voltage fluctuation occurs, the duration of the voltage fluctuation of the main power voltage is monitored, and then the delay detection time is determined.

[0017] The status of the downstream circuit is collected by using the microcontroller's I / O interrupts and periodic access based on the main power supply status.

[0018] The detection cycle of the subsequent circuit needs to be matched with the number of consecutive short circuits in the subsequent circuit.

[0019] Preferably, when the main power supply is in the state of main power failure or main power fluctuation, the status of the downstream circuit is actively collected, and the short circuit fault is determined before the downstream circuit actually short-circuits and burns out. The time obtained by multiplying the number of consecutive short circuits in the downstream circuit by the detection period of the downstream circuit is less than the minimum time for the fuse in the circuit to take effect.

[0020] Preferably, if the current main power supply status is normal and it is not in delay detection state, the status of the downstream circuit is detected by IO interrupt. Once a short circuit is detected in the downstream circuit, it is judged as a short circuit fault, the power supply to the downstream circuit is immediately cut off, and the abnormal information is transmitted to the platform. If the current main power supply status is normal and it is in delay detection state, it enters delay detection state and waits for the delay to end.

[0021] If the current main power supply status is fluctuating, then the voltage will fluctuate. If the IO interrupt method detects that the downstream circuit status is short-circuited, it enters the delayed detection state. During the delayed detection time, the IO interrupt method is used to detect that the downstream circuit status is short-circuited, and the power supply to the downstream circuit is no longer cut off. If the IO interrupt method detects that the downstream circuit status is not short-circuited, monitoring continues.

[0022] If the current main power supply is faulty, the backup power supply will be in operation. Even if the I / O interrupt method detects a short circuit in the downstream circuit, no operation will be performed. The microcontroller's I / O status will be read periodically according to the downstream circuit detection cycle. If the number of consecutive short circuits in the downstream circuit reaches the limit, it will be judged that a short circuit fault has occurred, the power supply to the downstream circuit will be immediately cut off, and the abnormal information will be transmitted to the platform.

[0023] An apparatus for implementing a short-circuit detection method to prevent false judgments includes a main power supply, a backup power supply, a microcontroller, a short-circuit detection module, a downstream circuit interaction module, and a downstream circuit power switching module. The main power supply, backup power supply, short-circuit detection module, downstream circuit interaction module, and downstream circuit power switching module are all connected to the microcontroller. The downstream circuit power switching module is connected to the downstream circuit interaction module, and the downstream circuit interaction module is connected to the short-circuit detection module. The downstream circuit interaction module ensures normal linkage or communication between the device and downstream devices. The downstream circuit power cut-off module performs corresponding operations when the microcontroller instructs to cut off or open the downstream circuit power. The short-circuit detection module is a hardware implementation for detecting whether the downstream interaction circuit is short-circuited, and works with the microcontroller to achieve short-circuit detection.

[0024] Preferably, it also includes a wireless upload module, which is connected to a microcontroller to report the test results to the platform and notify the relevant office and relevant personnel.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: By rationally determining the delay detection time (DT), the subsequent circuit status (CS) judgment method, the number of consecutive short circuits in the subsequent circuit (CSC), the subsequent circuit detection cycle (CST), and the main power supply status (MS) judgment method, the current main power supply status (MS) is monitored through real-time voltage acquisition, and the main power supply status (MS) is judged as normal, fluctuating, or faulty. The judgment method of the subsequent circuit status (CS) is dynamically adjusted under different states. Combined with the delay detection time (DT), subsequent circuit status (CS), subsequent circuit number of consecutive short circuits (CSC), subsequent circuit detection cycle (CST), and effective cooperation with hardware, it is possible to filter out various fluctuations in the main and backup power supplies and the field voltage, accurately judge the short circuit situation of the circuit to be judged, and protect the personal and property safety on site in a timely manner through emergency methods such as powering off the subsequent equipment and transmitting abnormal information to the platform. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a flowchart of the short-circuit detection method of the present invention.

[0028] Figure 2 This is a schematic diagram of the implementation device of the present invention. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1

[0031] like Figure 1 As shown, a short-circuit detection method to prevent false alarms includes collecting information on delay detection time (DT), subsequent circuit status (CS), number of consecutive short circuits in the subsequent circuit (CSC), subsequent circuit detection cycle (CST), and main power supply status (MS). The method dynamically adjusts the short-circuit detection method under different main power supply statuses (MS) to effectively filter out voltage fluctuations from the main power supply, backup power supply, and other sources. Accurate short-circuit detection and handling are achieved through the coordinated detection of DT, CS, CSC, and CST parameters under various main power supply statuses (MS). The specific functions of each parameter are as follows:

[0032] The main power supply status (MS) is the primary basis for determining the method of judging the status of the subsequent circuits after data acquisition. The judgment method is as follows:

[0033] First, the parameter values ​​need to be determined based on the equipment voltage: minimum threshold of main power (MMIT), number of consecutive main power detections (N), median filter level (FC), and detection cycle (T).

[0034] The minimum threshold for main power is determined by the voltage conditions of the actual circuit under two conditions: normal main power and voltage fluctuation. For example, assuming the main power is 24V, the voltage is stable above 22V when the main power is normal, and will be below 22V when the voltage fluctuates slightly. Therefore, the minimum threshold for main power can be set at 22V, which is an empirical value.

[0035] The number of continuous main power tests and the test cycle are standards for judging the status of the main power supply. They are subjectively intended to determine the severity of the main power supply. For example, if there is an abnormality within 5ms, the main power supply is abnormal. The number of tests is then determined in conjunction with the test cycle.

[0036] The detection cycle determines the speed at which the main power status is judged, which in turn affects the speed at which short circuit detection is judged. It is determined based on the larger value within the range of the microcontroller's AD conversion speed and the software's operating capability.

[0037] The median filtering level was determined based on multiple experiments to ensure that the collected values ​​did not show significant jumps when compared in consecutive comparisons after filtering.

[0038] The main power supply voltage value is periodically acquired according to the detection cycle (T). Multi-level filtering is performed according to the median filtering level (FC). The filtered main power supply voltage value is then checked to determine if it is lower than the minimum threshold voltage (MMIT). If it is, the main power supply is faulty; otherwise, it is normal. If the main power supply fails at least once but less than N times in N consecutive tests, the current main power supply status is main power supply fluctuation. If the main power supply fails in all N consecutive tests, the current main power supply status is main power supply fault. If the main power supply is normal in all N consecutive tests, the current main power supply status is main power supply normal.

[0039] The delay detection time (DT) is the time required to perform short-circuit detection and processing after detecting a mains power fluctuation. The reasonable delay detection time needs to be determined by monitoring the impact of on-site voltage fluctuations on the mains power voltage and monitoring the mains power voltage during mains / backup power switching. A power sampling circuit is built using a resistor divider, and the power supply voltage is obtained through a microcontroller's analog-to-digital converter. When a tolerable voltage fluctuation occurs, the duration of the mains power voltage fluctuation is monitored to determine the delay detection time.

[0040] The status of the subsequent circuit (CS) is implemented in hardware by reading the high and low levels of a specified I / O pin from the microcontroller to determine the short circuit condition of the subsequent circuit. A comparator compares the voltage of the subsequent circuit with a specified voltage (e.g., 0.02V) to generate high and low levels to indicate the continuity of the subsequent circuit. The specific implementation within the microcontroller can be divided into I / O interrupts and periodic access, using I / O interrupts and periodic access to collect the status of the subsequent circuit based on the main power supply status.

[0041] The consecutive short circuit count (CSC) of the downstream circuit refers to the number of times the downstream circuit status is judged when the main power supply is faulty or fluctuating. A short circuit is only judged when the count reaches a certain limit. To improve the fault tolerance of short circuit judgment, the number of short circuits must be at least 3.

[0042] The subsequent circuit detection cycle (CST) is the time interval for actively reading the status of the subsequent circuit. This time needs to be coordinated with the number of consecutive short circuits in the subsequent circuit (CSC).

[0043] When the main power supply is experiencing a main power failure or fluctuation, the system actively collects the status of the downstream circuits. It detects the short circuit fault before the downstream circuit actually short-circuits and burns out. The time obtained by multiplying the consecutive short circuit count (CSC) and the downstream circuit detection period (CST) should be less than the minimum time required for the fuse in the circuit to activate. The detection period is determined based on the software's capabilities, while the CSC and CST must be determined through actual experiments on the specific circuit and are empirical values.

[0044] Once all the above parameters are determined, the short-circuit detection method for preventing false judgments can be executed as follows:

[0045] If the current main power supply status (MS) is normal, and it is not in delay detection mode, it proves that the current and previous main power supply and voltage are normal. The status of the downstream circuit (CS) is detected via I / O interrupt. Once a short circuit is detected in the downstream circuit (CS), it is determined to be a short circuit fault, the power supply to the downstream circuit is immediately cut off, and an abnormality information is transmitted to the platform. If the current main power supply status (MS) is normal, and it is currently in delay detection mode (i.e., the main power is normal and it has entered delay detection mode), no detection is performed during this period; it waits for the delay to end. After the delay ends, it exits the delay detection mode and re-determines how to detect based on the current power supply status.

[0046] If the current main power supply state (MS) is fluctuating, then voltage fluctuations will occur. If the I / O interrupt method detects a short circuit in the downstream circuit state (CS), it enters a delayed detection state. During the delayed detection time (DT), regardless of the power supply state, even if the I / O interrupt method detects a short circuit in the downstream circuit state (CS), the power supply to the downstream circuit will not be cut off, reducing false short circuit detections caused by voltage fluctuations. If the I / O interrupt method detects that the downstream circuit state (CS) is not short-circuited, then normal monitoring continues.

[0047] If the current main power supply status (MS) is faulty, then the backup power supply is in operation. To avoid misjudging the status (CS) of the downstream circuit due to a sudden restoration of the main power supply, no operation is performed even if the downstream circuit status (CS) is detected as short-circuited by the I / O interrupt method. The I / O status of the microcontroller connected to the hardware is periodically read according to the downstream circuit detection cycle (CST). If the number of consecutive short circuits in the downstream circuit reaches the downstream circuit status CSC limit, it is determined that a real short circuit fault has occurred, the power supply to the downstream circuit is immediately cut off, and an abnormal information is transmitted to the platform.

[0048] It should be noted that this method requires continuous adjustment of parameters and judgment methods through practice in order to achieve better short-circuit detection and prevent false judgments, and only then can the method play a greater role.

[0049] Example 2

[0050] Before using the short-circuit detection method of Example 1, a short-circuit detection implementation device to prevent false judgments should first be designed based on a specific industrial alarm control device or similar device. This device includes a main power supply, a backup power supply, a microcontroller, a short-circuit detection module, a downstream circuit interaction module, and a downstream circuit power switching module. All three modules are connected to the microcontroller. The downstream circuit power switching module is connected to the downstream circuit interaction module, which in turn is connected to the short-circuit detection module. The main power supply and backup power supply ensure the normal operation of the equipment. The main power supply is directly connected to the mains power, while the backup power supply is the device's built-in battery. When the main power supply malfunctions, the backup power supply ensures the equipment's operation. The downstream circuit interaction module ensures normal linkage or communication between the device and downstream devices. The downstream circuit power cut-off module executes corresponding operations when the microcontroller instructs it to cut off or open the downstream circuit power supply. The short-circuit detection module is the hardware implementation for detecting whether the downstream interaction circuit is short-circuited; it needs to cooperate with the microcontroller to achieve short-circuit detection. The microcontroller implements the device's functional operation and all the logic of this short-circuit detection method.

[0051] It also includes a wireless upload module, which connects to a microcontroller to report the test results to the platform and notify the relevant offices and personnel.

[0052] The parameters for judging the delayed detection time (DT), the status of the subsequent circuit (CS), the number of consecutive short circuits in the subsequent circuit (CSC), the detection cycle of the subsequent circuit (CST), and the status of the main power supply (MS) should be determined based on the hardware of the equipment and the possible field environment. The reasonable determination of these parameters and judgment methods should fully rely on the equipment hardware, the operating environment, a large amount of time monitoring, and empirical values.

[0053] Once the required parameters and methods are determined, the software functional modules of the detection method according to the present invention are implemented, and the program file containing the functional modules is burned into the device to realize short circuit detection that prevents false judgment.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A short-circuit detection method for preventing a misjudgment, characterized by comprising: The system collects information on delay detection time, downstream circuit status, number of consecutive short circuits in the downstream circuit, downstream circuit detection cycle, and main power supply status. By combining the parameters of delay detection time, downstream circuit status, number of consecutive short circuits in the downstream circuit, and downstream circuit detection cycle collected under different main power supply statuses, it achieves accurate short circuit judgment and handling, and effectively filters out voltage fluctuations from the main power supply, backup power supply, and other sources. The main power supply status includes main power fluctuation, main power failure, and main power normal. The current main power supply status is fluctuating. If the IO interrupt method detects that the downstream circuit status is short-circuited, it will enter the delayed detection state. When the main power supply is in a state of main power failure or main power fluctuation, the status of the downstream circuit is actively collected. The short circuit fault is detected before the downstream circuit actually short-circuits and burns out. The time obtained by multiplying the number of consecutive short circuits in the downstream circuit by the detection period of the downstream circuit is less than the minimum time for the fuse in the circuit to take effect.

2. The false judgment preventing short circuit detection method according to claim 1, characterized by, The status of the subsequent circuit after the main power supply status judgment is determined based on the equipment voltage, including the parameter values ​​of the minimum threshold of the main power supply, the number of consecutive detections of the main power supply, the median filtering level, and the detection cycle.

3. The false judgment preventing short circuit detection method according to claim 2, characterized by, The main power supply voltage value is acquired periodically according to the detection cycle. The main power supply voltage value is filtered in multiple stages according to the median filtering level. It is determined whether the filtered main power supply voltage value is lower than the minimum threshold of the main power supply. If it is, the main power supply is faulty; otherwise, the main power supply is normal.

4. The short-circuit detection method for preventing false judgment according to claim 3, characterized in that, If the main power supply fails at least once but less than N times in N consecutive tests, the current main power supply status is main power fluctuation; if the main power supply fails in all N consecutive tests, the current main power supply status is main power failure; if the main power supply is normal in all N consecutive tests, the current main power supply status is main power normal.

5. The short-circuit detection method for preventing false judgment according to claim 3 or 4, characterized in that, The delay detection time is the time that is delayed in executing short-circuit detection and processing when a main power fluctuation is detected. The delay detection time needs to be determined by monitoring the impact of on-site voltage fluctuations on the main power voltage and monitoring the main power voltage during the main power / backup power switching process. The status of the subsequent circuit is implemented by hardware, which reads the high and low levels of a specified IO of the microcontroller to determine the short circuit status of the subsequent circuit, and uses a comparator to compare the voltage of the subsequent circuit with a specified voltage to generate high and low levels to indicate the on / off state of the subsequent circuit. The number of consecutive short circuits in the subsequent circuit refers to the number of times the state of the subsequent circuit is determined when the main power supply is in a fault or fluctuating state. The detection cycle of the subsequent circuit is the time interval for actively reading the state of the subsequent circuit.

6. The short-circuit detection method for preventing false judgment according to claim 5, characterized in that, The detection cycle is determined based on the larger value between the microcontroller's AD conversion speed and the software's operating capability. The median filtering level was determined based on multiple experiments, ensuring that the collected values ​​do not show significant jumps after multiple consecutive comparisons of the filtered values. A power sampling circuit is built by resistor voltage divider. The power supply voltage is obtained by microcontroller. When a tolerable voltage fluctuation occurs, the duration of the voltage fluctuation of the main power voltage is monitored, and then the delay detection time is determined. The status of the downstream circuit is collected by using the microcontroller's I / O interrupts and periodic access based on the main power supply status. The detection cycle of the subsequent circuit needs to be matched with the number of consecutive short circuits in the subsequent circuit.

7. The short-circuit detection method for preventing false judgment according to any one of claims 1-4 and 6, characterized in that, If the current main power supply status is normal and it is not in delay detection state, the status of the downstream circuit is detected by IO interrupt. Once a short circuit is detected in the downstream circuit, it is judged as a short circuit fault, the power supply to the downstream circuit is immediately cut off, and the abnormal information is transmitted to the platform. If the current main power supply status is normal and it is in delay detection state, it enters delay detection state and waits for the delay to end. If the current main power supply status is fluctuating, then the voltage will fluctuate. If the IO interrupt method detects that the downstream circuit status is short-circuited, it enters the delayed detection state. During the delayed detection time, the IO interrupt method is used to detect that the downstream circuit status is short-circuited, and the power supply to the downstream circuit is no longer cut off. If the IO interrupt method detects that the downstream circuit status is not short-circuited, monitoring continues. If the current main power supply is faulty, the backup power supply will be in operation. Even if the I / O interrupt method detects a short circuit in the downstream circuit, no operation will be performed. The microcontroller's I / O status will be read periodically according to the downstream circuit detection cycle. If the number of consecutive short circuits in the downstream circuit reaches the limit, it will be judged that a short circuit fault has occurred, the power supply to the downstream circuit will be immediately cut off, and the abnormal information will be transmitted to the platform.

8. The apparatus for implementing the short-circuit detection method for preventing false judgment according to claim 7, characterized in that, It includes a main power supply, a backup power supply, a microcontroller, a short-circuit detection module, a downstream circuit interaction module, and a downstream circuit power switching module. All of these components are connected to the microcontroller. The downstream circuit power switching module is connected to the downstream circuit interaction module, which in turn is connected to the short-circuit detection module. The downstream circuit interaction module ensures normal linkage or communication between the device and downstream devices. The downstream circuit power cut-off module performs corresponding operations when the microcontroller instructs it to cut off or turn on the downstream circuit power. The short-circuit detection module is a hardware implementation for detecting whether the downstream interaction circuit is short-circuited, working in conjunction with the microcontroller to achieve short-circuit detection.

9. The implementing apparatus according to claim 8, characterized in that, It also includes a wireless upload module, which connects to a microcontroller to report the test results to the platform and notify the relevant offices and personnel.

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