Overcurrent protection method and system based on high-voltage linear voltage regulator

Abstract

The application discloses a high-voltage linear voltage stabilizer-based overcurrent protection method and system, and relates to the technical field of high-voltage linear voltage stabilizers, solves the problem that protection is started only by detecting whether the output current exceeds a fixed threshold, and comprehensive protection is not combined with the device characteristics of an LDO silicon-based regulating tube, and the application distinguishes between two cases of "excessive loss" and "controllable loss" through the calculation of standard loss and current loss, directly increases the internal resistance to the current return interval when the loss is controllable, ensures the regulation efficiency, starts a plurality of internal resistance adjustment processes when the loss is excessive, dynamically adjusts the internal resistance increase rate by tracking the temperature change trend in real time, until the temperature shows a downward trend, and continuously optimizes the regulation effect through the step-by-step update of the current interval; this design avoids the "regulation-overcurrent-regulation again" cycle caused by the subsequent temperature change of the traditional single regulation, and enables the voltage stabilizer to be stably maintained in a temperature balance state after protection.

Description

Technical Field

[0001] This invention relates to the field of high-voltage linear regulator technology, specifically to an overcurrent protection method and system based on a high-voltage linear regulator. Background Technology

[0002] High-voltage linear regulators are core components in electronic systems that convert high-voltage input to stable low-voltage output. They are widely used in industrial control, automotive electronics, instrumentation and other fields. Their operational stability directly determines the operational reliability of downstream loads (such as sensors and control chips).

[0003] In practical applications, the input voltage of an LDO is usually much higher than its output voltage, and the voltage difference loss must be borne by the internal regulating transistor. Abnormal fluctuations in the output current (i.e., overcurrent) are the main risk of LDO overheating and damage. When the output current exceeds the rated range, the conduction loss of the regulating transistor will increase sharply. If not intervened in time, the temperature will continue to rise, which may not only trigger the LDO thermal shutdown function and cause the system to shut down, but may also cause permanent damage to the regulating transistor due to long-term overheating, leading to the failure of the entire electronic system.

[0004] To address overcurrent risks, existing technologies have developed overcurrent protection schemes for LDOs. However, these schemes generally suffer from insufficient protection accuracy, limited temperature control, and a lack of fault warnings. Firstly, most schemes employ a single "fixed threshold trigger" protection logic, initiating protection solely by detecting whether the output current exceeds a fixed threshold. This fails to consider the device characteristics of the LDO's silicon-based regulator and does not differentiate between "undercurrent" and "overcurrent" scenarios. This can easily lead to blind adjustments causing abnormal output voltage or false triggering of protection under normal operating conditions, impacting system efficiency. Secondly, traditional schemes often employ a "single-time adjustment" mode, meaning that only the internal resistance is adjusted once after overcurrent detection, without considering... The reverse effect of temperature changes on internal resistance after adjustment: For example, if the temperature continues to rise due to previous losses after a single increase in internal resistance, the internal resistance of the silicon-based regulating tube will further decrease, which may cause the output current to exceed the threshold again, forming a repeated cycle of "regulation-overcurrent-reregulation". It is impossible to achieve dynamic temperature balance of the LDO, and there is still a risk of overheating and damage. Thirdly, the existing protection scheme only focuses on "solving the current overcurrent problem" and lacks monitoring and analysis of the long-term operating status of the LDO. It cannot identify the decline in regulation capability caused by device aging and hidden circuit faults. Often, maintenance is only carried out passively when the LDO suddenly fails, which not only increases the cost of later maintenance, but may also cause greater losses due to the spread of the fault.

[0005] Therefore, there is an urgent need for an overcurrent protection scheme for high-voltage linear regulators that can adapt to the characteristics of silicon-based regulating tubes, achieve dynamic temperature balance, and have fault early warning capabilities, in order to solve the core pain points of low protection accuracy, unstable temperature control, and difficulty in early warning of faults in existing technologies. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an overcurrent protection method and system based on a high-voltage linear regulator, which solves the problem of initiating protection solely by detecting whether the output current exceeds a fixed threshold, without taking into account the device characteristics of the LDO silicon-based regulating transistor for comprehensive protection.

[0007] To achieve the above objectives, the present invention provides an overcurrent protection method based on a high-voltage linear regulator, comprising the following steps:

[0008] Step 1: Confirm the sampling current related to the sampling terminal of the high-voltage linear regulator, and based on the comparison characteristics between the sampling current and the preset current range, confirm whether a voltage drop process needs to be executed, and simultaneously generate a voltage drop adjustment signal. The specific method is as follows:

[0009] The output current of the high-voltage linear regulator is monitored in real time through the sampling terminal, and the monitored output current is denoted as D. i Where i represents different times, and the real-time monitored output current is compared with the preset current range: if D i ∈ Current range, no processing is required, if D i If the current range is specified, the voltage drop process will be executed, and the current range is the preset range.

[0010] If D i If the current is less than the minimum value in the current range, a voltage drop reduction signal is generated;

[0011] If D i If the current exceeds the maximum value in the current range, a voltage drop boosting signal is generated;

[0012] Step 2: Based on the generated voltage drop adjustment signal, adjust the internal resistance of the high-voltage linear regulator. Simultaneously confirm the internal losses during the resistance increase process to ensure they do not exceed the limit. Then, based on the confirmation results, execute different voltage drop adjustment processes:

[0013] Furthermore, in step two, the specific method for adjusting the internal resistance of the high-voltage linear regulator is as follows:

[0014] If the voltage drop adjustment signal is a voltage drop reduction signal, the internal resistance of the high-voltage linear regulator is reduced directly, and the sampling current is monitored in real time. The process stops when the monitored sampling current is within the current range.

[0015] If the voltage drop adjustment signal is a voltage drop boosting signal, then the internal loss needs to be specifically confirmed: The input standard voltage is calibrated as V1, and the output standard voltage is calibrated as V2. The midpoint of the current range is recorded as the standard current value Bz. The standard loss is calculated as: (V1-V2)×Bz = standard loss. Then, based on the sampling resistor R1 associated with the sampling terminal, the standard loss is calculated as: R1×D i =Vs i Confirm the actual output voltage value Vs at the current moment. i Then use: (V1-Vs) i )×D i = Current loss. If the current loss and standard loss satisfy: (current loss - standard loss) > Y1, then process one will be executed to perform the voltage drop adjustment process, where Y1 is the preset threshold loss. If not satisfied, then process two will be executed to perform the voltage drop adjustment process.

[0016] Furthermore, process one specifically includes:

[0017] Based on the confirmed values ​​of V1, V2, and the standard current value Bz, determine the standard resistance value, which is calculated as (V1 - V2) ÷ Bz. Then, determine the minimum value within the current range, denoted as Q. min And adopt: (V1-Vs) i )÷Q min =The current resistance value, the corresponding current range is defined as [Q]. min Q max The current value range currently used is Q. min -Bz;

[0018] Confirm the adjustable resistance value, which is equal to (standard resistance value - current resistance value). Gradually increase the internal resistance of the high-voltage linear regulator and record the associated temperature data of the high-voltage linear regulator during the increase. Real-time confirm the trend of temperature data before and after the increase, where the trend is equal to the temperature data at the next moment minus the temperature data at the previous moment. From the real-time confirmed trend, confirm the trend of adjacent time periods. Record the trend of the period before the adjacent time period as QS1 and the trend of the period after the adjacent time period as QS2. By controlling the increase trend of the internal resistance in real time, when QS1 and QS2 are found to satisfy (QS2 ÷ QS1) ≤ 0.9, the increase trend of the internal resistance is kept unchanged, and the current internal resistance adjustment process is completed. At the time of adjustment completion, confirm whether the monitored QS1 and QS2 satisfy (QS2 ÷ QS1) < 0. If they are satisfied, the adjustment process of process one is completed. If they are not satisfied, the subsequent adjustment process is continued.

[0019] Subsequent adjustment and processing: from the current range [Q] min Q max The range of values ​​for the discard current [Q] is within the specified range. min[Bz], and update to obtain a new current range, and reconfirm the standard resistance value and the current resistance value based on the new current range to confirm the adjustable resistance value, and then use the same adjustment process as the first group of adjustment processes to identify whether its temperature change trend meets the standard: if it meets the standard, the corresponding internal resistance adjustment process is completed; if it still does not meet the standard, the second group of adjustment processes is executed again, and the updated current range is updated again using the same update method.

[0020] When the internal resistance adjustment process exceeds five groups, an error signal will be generated and displayed directly.

[0021] Furthermore, process two specifically includes:

[0022] The internal resistance of the high-voltage linear regulator is directly increased, and the sampling current is monitored in real time. The process stops when the monitored sampling current is within the current range.

[0023] Preferred options also include:

[0024] Step 3: Reanalyze the temperature change characteristics associated with the voltage drop adjustment process, identify whether the temperature change characteristics are gradually decreasing, and determine whether there is any abnormality in the high-voltage linear regulator based on the identification results.

[0025] Furthermore, in step three, the specific method for identifying whether there is an abnormality in the high-voltage linear regulator is as follows:

[0026] The changing trends of several sets of temperature data during a single pressure drop adjustment process are confirmed, and the average of the confirmed changing trends is processed to confirm the adjustment characteristics associated with this pressure drop adjustment process.

[0027] The adjustment features associated with the adjustment process of multiple sets of internal resistance are sorted according to their time sequence to confirm the adjustment feature sequence. It is then identified whether the adjustment features associated with the adjustment feature sequence gradually decrease. If so, it means that there is no abnormality when the high-voltage linear regulator performs overcurrent protection. If not, it means that there is an abnormality in the high-voltage linear regulator, and a temperature change abnormality signal is directly generated for display.

[0028] Preferably, the overcurrent protection system based on a high-voltage linear regulator includes:

[0029] The sampling monitoring end monitors the sampling current related to the sampling end of the high-voltage linear regulator and transmits the real-time monitored sampling current to the signal generation end.

[0030] At the signal generation end, the sampled current is compared with the preset current range. Based on the comparison result, it is determined whether a voltage drop process needs to be executed, and a voltage drop adjustment signal is generated simultaneously.

[0031] The voltage drop adjustment processing end adjusts the internal resistance of the high-voltage linear regulator according to the generated voltage drop adjustment signal. During the process of increasing the internal resistance, the internal loss is checked simultaneously to see if it exceeds the standard. If it does, one or more sets of internal resistance adjustment processes are executed. The process stops when the temperature change trend is confirmed to meet the standard. If it does not exceed the standard, the internal resistance of the high-voltage linear regulator is adjusted directly.

[0032] On the anomaly detection end, the temperature change characteristics associated with the voltage drop adjustment process are re-analyzed to identify whether the temperature change characteristics are gradually decreasing, and based on the identification results, it is determined whether there is an anomaly in the high-voltage linear regulator.

[0033] This invention provides an overcurrent protection method and system based on a high-voltage linear regulator. Compared with the prior art, it has the following advantages:

[0034] By linking and optimizing the "loss-temperature-internal resistance" factors, the voltage regulator achieves dynamic temperature balance, preventing repeated overcurrent and overheating damage. In the core scenario of excessively low internal resistance (Di exceeding the upper limit), the method first distinguishes between "loss exceeding the limit" and "loss controllable" situations by calculating the standard loss and the current loss: when loss is controllable, the internal resistance is directly increased to the current return range to ensure regulation efficiency; when loss exceeds the limit, multiple internal resistance adjustment processes are initiated. By tracking the temperature change trend in real time (QS1, QS2), the rate of internal resistance increase is dynamically adjusted until the temperature shows a decreasing trend (QS2 / QS1 < 0). The regulation effect is continuously optimized through gradual updates of the current range (eliminating invalid ranges and retaining optimized ranges). This design avoids the "regulation-overcurrent-reregulation" cycle caused by subsequent temperature changes in traditional single-stage regulation, allowing the voltage regulator to maintain a stable temperature balance after protection, fundamentally preventing linear voltage regulator chips from being damaged by long-term overheating.

[0035] An anomaly identification mechanism based on temperature change characteristics is added to achieve "early warning and preventative maintenance" of faults, extending the service life of the voltage regulator. The method targets multiple sets of internal resistance adjustment processes, forming an "adjustment characteristic" by averaging the temperature change trends. It then analyzes whether the adjustment characteristic gradually decreases over time. If the characteristic does not decrease, it determines that the voltage regulator has aging or other anomalies and generates a temperature change anomaly signal. This mechanism overcomes the limitation of traditional protection that "only handles current overcurrent," proactively identifying the decline in the regulator's regulation capability due to aging, prompting personnel to conduct aging tests and module parameter checks. This avoids sudden faults caused by latent aging of components, reduces subsequent maintenance costs, and extends the overall service life of the voltage regulator. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the method flow of the present invention;

[0037] Figure 2This is a schematic diagram of the principle framework of the present invention. Detailed Implementation

[0038] 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.

[0039] First Embodiment

[0040] Please see Figure 1 This application provides an overcurrent protection method based on a high-voltage linear regulator, comprising the following steps:

[0041] Step 1: Confirm the sampling current at the sampling terminal of the high-voltage linear regulator, and based on the comparison characteristics between the sampling current and the preset current range, confirm whether a voltage drop process needs to be executed, and simultaneously generate a voltage drop adjustment signal. Specifically, the high-voltage linear regulator can be understood as a variable resistor. If the input voltage is 12V and the output voltage required is 5V, then the voltage needs to be reduced by 7V. Therefore, the voltage drop process is achieved by adjusting the resistance value of the corresponding variable resistor. During the voltage drop process, there is a corresponding sampling module at the output terminal to collect the output current. When the collected output current far exceeds the set standard current, it indicates that there is an overcurrent. In order to avoid the generation of large temperatures during the overcurrent process, the regulator needs to be protected by performing a voltage drop process to ensure that the corresponding linear regulator chip is not damaged due to excessive temperature.

[0042] The specific method for confirming whether a pressure reduction process needs to be executed is as follows:

[0043] The output current of the high-voltage linear regulator is monitored in real time through the sampling terminal, and the monitored output current is denoted as D. i Where i represents different times, and the real-time monitored output current is compared with the preset current range: if D i If D ∈ the current range, it means that no voltage drop process is needed, and its output current is within the standard numerical range, requiring no processing. i The current range indicates that a voltage drop process needs to be performed, and the output current is not within the standard value range. The current range is a preset range, which is set by the operator according to the actual application scenario.

[0044] The specific method for generating the voltage drop adjustment signal is as follows:

[0045] If D i If the value is less than the minimum value in the current range, it means that its internal resistance is too high and needs to be reduced to generate a voltage drop reduction signal.

[0046] If D i If the value is greater than the maximum value in the current range, it means that its internal resistance is too small and needs to be increased to generate a voltage drop increase signal.

[0047] Specifically, when the corresponding current is lower than the minimum value of the corresponding range, it means that the output voltage is too small. This means that the adjustment range was too large in the original linear adjustment process, resulting in an excessive voltage drop. In this case, the internal resistance needs to be adjusted in the opposite direction to reduce the internal resistance and ensure that the output voltage meets the standard. Conversely, the internal resistance needs to be increased to ensure that the output current is reduced and the corresponding output voltage meets the standard.

[0048] Step 2: Based on the generated voltage drop adjustment signal, adjust the internal resistance of the high-voltage linear regulator. During the process of increasing the internal resistance, simultaneously confirm the internal losses to see if they exceed the standard. Then, based on the confirmation result, execute different voltage drop adjustment processes. Specifically, when the internal losses are too large, it indicates severe overheating. If only a single internal resistance adjustment process is executed, a corresponding overcurrent situation will still be generated simultaneously in the subsequent monitoring process. Therefore, multiple adjustments are required to ensure that the regulator can reach a relatively dynamic temperature balance. In this case, the protection process is an effective protection process, rather than the regulator experiencing overcurrent again a few minutes later due to temperature influence after one adjustment.

[0049] The specific method for adjusting the internal resistance of the high-voltage linear regulator is as follows:

[0050] If the voltage drop adjustment signal is a voltage drop reduction signal, the internal resistance of the high-voltage linear regulator is directly reduced, and the sampling current is monitored in real time. The adjustment stops when the monitored sampling current is within the current range. In this case, direct adjustment is usually sufficient. When the internal resistance is too high and the current is too low, it means that the associated temperature will also be low. This is usually due to an error in the adjustment parameters. The regulating tube inside the linear regulator is almost entirely made of semiconductor material (silicon). The higher the temperature, the lower the internal resistance of the regulating tube. Therefore, when the internal resistance is too high, direct adjustment is sufficient.

[0051] If the voltage drop adjustment signal is a voltage drop boosting signal, then the internal loss needs to be specifically confirmed: The input standard voltage is calibrated as V1, and the output standard voltage is calibrated as V2. The midpoint of the current range is recorded as the standard current value Bz. The standard loss is calculated as: (V1-V2)×Bz = Standard Loss (where V1, V2, and Bz are the standard operating parameters set by the corresponding voltage regulator; the standard loss associated with normal standard operating conditions is confirmed according to the confirmation formula P=UI). Then, based on the sampling resistor R1 associated with the sampling terminal (this resistance value can be directly extracted from the voltage regulator's specifications), the standard loss is calculated as: R1×D i =Vs i Confirm the actual output voltage value Vs at the current moment. i Then use: (V1-Vs) i )×D i = Current loss. If the current loss and the standard loss satisfy: (current loss - standard loss) > Y1, then process one is executed to perform the voltage drop adjustment process, where Y1 is the preset threshold loss, which is set in advance by the operator according to the application scenario of the voltage regulator. If it is not satisfied, then process two is executed to perform the voltage drop adjustment process.

[0052] Process 1: Execute one or more sets of internal resistance adjustment processes, and stop when the temperature change trend is confirmed to meet the target.

[0053] Based on the confirmed values ​​of V1, V2, and the standard current value Bz, determine the standard resistance value, which is calculated as (V1 - V2) ÷ Bz. Then, determine the minimum value within the current range, denoted as Q. min And adopt: (V1-Vs) i )÷Q min =The current resistance value, the corresponding current range is defined as [Q]. min Q max The current value range currently used is Q. min -Bz;

[0054] Confirm the adjustable resistance value, which is equal to (standard resistance - current resistance). Gradually increase the internal resistance of the high-voltage linear regulator, recording the associated temperature data during the increase. Real-time monitor the temperature trend before and after the increase, where the trend is calculated as the difference between the temperature data at the next moment and the temperature data at the previous moment. From this real-time trend, identify the trend changes in adjacent time periods, recording the trend before the adjacent time period as QS1 and the trend after the adjacent time period as QS2. By controlling the increase in internal resistance in real-time (i.e., the rate of increase varies across different time periods, possibly increasing by one unit resistance value within 1 ms), the internal resistance will gradually increase. Within the next 1ms, the resistance is increased by 1.1 units, which means the change trend is improved in real time. When QS1 and QS2 are detected to satisfy (QS2÷QS1)≤0.9 (that is, the temperature change trend is decreasing, which means that the temperature is optimizing), the internal resistance is kept unchanged, and the current internal resistance adjustment process is completed. At the time of adjustment, it is confirmed whether the monitored QS1 and QS2 satisfy (QS2÷QS1)<0 (that is, the temperature is decreasing, which means that the current resistance adjustment process is effective). If it is satisfied, the adjustment process of process one is completed. If it is not satisfied, the subsequent adjustment process is continued.

[0055] Subsequent adjustment and processing: from the current range [Q] min Q max The range of values ​​for the discard current [Q] is within the specified range. min [Bz], and update to obtain a new current range, and reconfirm the standard resistance value and the current resistance value based on the new current range to confirm the adjustable resistance value, and then use the same adjustment process as the first group of adjustment processes to identify whether its temperature change trend meets the standard: if it meets the standard, the corresponding internal resistance adjustment process is completed; if it still does not meet the standard, the second group of adjustment processes is executed again, and the updated current range is updated again using the same update method (after the update, it is still necessary to confirm the minimum value and the intermediate value, that is, to halve the corresponding current range, remove the second half of the value range, keep the first half of the value range, and so on, to carry out the subsequent internal resistance adjustment process).

[0056] When the internal resistance adjustment process exceeds five groups, an error signal will be generated directly to indicate that the current voltage regulator cannot complete the corresponding internal resistance adjustment process. Manual intervention is required to identify whether there is internal circuit damage or short circuit and to perform maintenance in a timely manner.

[0057] Process 2: Directly increase the internal resistance of the high-voltage linear regulator and monitor the sampling current in real time. Stop when the monitored sampling current is within the current range (this part is under the condition that the loss is not exceeded, so the change in internal resistance is caused by the loss, and the internal resistance can be directly increased. The chip temperature is within the controllable range and no adjustment is required).

[0058] Step 3: Reanalyze the temperature change characteristics associated with the voltage drop adjustment process to identify whether the temperature change characteristics are gradually decreasing. Based on the identification results, determine whether there is any abnormality in the high-voltage linear regulator. This part only applies to multiple adjustment processes; a single adjustment process cannot identify the specific changes in temperature change characteristics. When a specific abnormality exists, it generally indicates that the corresponding regulator is aging. The specific method for determining whether there is any abnormality in the high-voltage linear regulator is as follows:

[0059] The changing trends of several sets of temperature data during a single pressure drop adjustment process are confirmed, and the average of the confirmed changing trends is processed to confirm the adjustment characteristics associated with this pressure drop adjustment process.

[0060] The adjustment features associated with the adjustment process of multiple sets of internal resistance are sorted according to the time sequence to confirm the adjustment feature sequence. It is then identified whether the adjustment features associated with the adjustment feature sequence gradually decrease. If so, it means that there is no abnormality when the high voltage linear regulator performs overcurrent protection. If not, it means that there is an abnormality in the high voltage linear regulator, and a temperature change abnormality signal is directly generated for display.

[0061] When external personnel discover abnormal temperature signals, it is necessary to perform aging tests on the high-voltage linear regulator and conduct parameter checks on certain modules. Multimeters or related instruments can be used to identify the parameter performance of specific modules and perform timely maintenance.

[0062] Second Embodiment

[0063] Combination Figure 2 An overcurrent protection system based on a high-voltage linear regulator includes:

[0064] The sampling monitoring end monitors the sampling current related to the sampling end of the high-voltage linear regulator and transmits the real-time monitored sampling current to the signal generation end.

[0065] At the signal generation end, the sampled current is compared with the preset current range. Based on the comparison result, it is determined whether a voltage drop process needs to be executed, and a voltage drop adjustment signal is generated simultaneously.

[0066] The voltage drop adjustment processing end adjusts the internal resistance of the high-voltage linear regulator according to the generated voltage drop adjustment signal. During the process of increasing the internal resistance, the internal loss is checked simultaneously to see if it exceeds the standard. If it does, one or more sets of internal resistance adjustment processes are executed. The process stops when the temperature change trend is confirmed to meet the standard. If it does not exceed the standard, the internal resistance of the high-voltage linear regulator is adjusted directly.

[0067] On the anomaly detection end, the temperature change characteristics associated with the voltage drop adjustment process are re-analyzed to identify whether the temperature change characteristics are gradually decreasing, and based on the identification results, it is determined whether there is an anomaly in the high-voltage linear regulator.

[0068] Some of the data in the above formulas are numerical calculations with dimensions removed, and the contents not described in detail in this specification are all prior art known to those skilled in the art.

[0069] The above embodiments are only used to illustrate the technical methods of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. An overcurrent protection method based on a high-voltage linear regulator, characterized in that, Includes the following steps: Step 1: Confirm the sampling current related to the sampling terminal of the high-voltage linear regulator, and based on the comparison characteristics between the sampling current and the preset current range, confirm whether a voltage drop process needs to be executed, and simultaneously generate a voltage drop adjustment signal. Step 2: Adjust the internal resistance of the high-voltage linear regulator according to the generated voltage drop adjustment signal. Simultaneously check the internal loss during the process of increasing the internal resistance to confirm whether the internal loss exceeds the standard. The specific method for adjusting the internal resistance of a high-voltage linear regulator is as follows: If the voltage drop adjustment signal is a voltage drop reduction signal, the internal resistance of the high-voltage linear regulator is reduced directly, and the sampling current is monitored in real time. The process stops when the monitored sampling current is within the current range. If the voltage drop adjustment signal is a voltage drop boosting signal, then the internal loss needs to be specifically confirmed: The input standard voltage is calibrated as V1, and the output standard voltage is calibrated as V2. The midpoint of the current range is recorded as the standard current value Bz. The standard loss is calculated as: (V1-V2)×Bz = standard loss. Then, based on the sampling resistor R1 associated with the sampling terminal, the standard loss is calculated as: R1×D i =Vs i Confirm the actual output voltage value Vs at the current moment. i Then use: (V1-Vs) i )×D i =Current loss. If the current loss and standard loss satisfy: (current loss - standard loss) > Y1, then process one will execute the voltage drop adjustment process, where Y1 is the preset threshold loss, and D... i The output current is monitored in real time, where i represents different times. If the condition is not met, process two is executed to perform the voltage drop adjustment process. Process 1: Execute one or more sets of internal resistance adjustment processes, and stop when the temperature change trend is confirmed to meet the target; Step 2: Simply adjust the internal resistance of the high-voltage linear regulator.

2. The overcurrent protection method based on a high-voltage linear regulator according to claim 1, characterized in that, In step one, the specific method for confirming whether a pressure reduction process needs to be executed is as follows: The output current of the high-voltage linear regulator is monitored in real time through the sampling terminal, and the monitored output current is compared with a preset current range: if Within the current range, no processing is required. If the current range is specified, the voltage drop process will be executed, and the current range is the preset range.

3. The overcurrent protection method based on a high-voltage linear regulator according to claim 2, characterized in that, In step one, the specific method for generating the voltage drop adjustment signal is as follows: If D i If the current is less than the minimum value in the current range, a voltage drop reduction signal is generated; If D i If the current exceeds the maximum value in the current range, a voltage drop boosting signal is generated.

4. The overcurrent protection method based on a high-voltage linear regulator according to claim 1, characterized in that, The first process specifically includes: Based on the confirmed V1, V2, and standard current value Bz, confirm the standard resistance value, which is = Then confirm the minimum value of the current range, denoted as Q. min and adopt: The current resistance value is intended to be associated with a current range of [Q]. min Q max The current value range currently used is [Q]. min [,Bz]; Confirm the adjustable resistance value, which is equal to (standard resistance - current resistance). Gradually increase the internal resistance of the high-voltage linear regulator and record the associated temperature data of the high-voltage linear regulator during the increase. Real-time monitor the temperature trend before and after the increase, where the trend is equal to the temperature data at the next moment minus the temperature data at the previous moment. From the real-time trend, confirm the trend changes in adjacent time periods. Record the trend before the adjacent time period as QS1 and the trend after the adjacent time period as QS2. Increase the internal resistance by controlling its upward trend in real time. When QS1 and QS2 meet the following conditions: At the same time, the increasing trend of the control internal resistance remains unchanged, and the current internal resistance adjustment process is completed. At the moment of completion of the adjustment, it is confirmed whether the monitored QS1 and QS2 are satisfied: If the conditions are met, the adjustment process of process one is completed; otherwise, the subsequent adjustment processes continue to be executed. Subsequent adjustment and processing: from the current range [Q] min Q max The range of values ​​for the discard current [Q] is within the specified range. min [Bz], and update to obtain a new current range, and reconfirm the standard resistance value and the current resistance value based on the new current range to confirm the adjustable resistance value, and then use the same adjustment process as the first group of adjustment processes to identify whether its temperature change trend meets the standard: if it meets the standard, the corresponding internal resistance adjustment process is completed; if it still does not meet the standard, the second group of adjustment processes is executed again, and the updated current range is updated again using the same update method. When the internal resistance adjustment process exceeds five groups, an error signal will be generated and displayed directly.

5. The overcurrent protection method based on a high-voltage linear regulator according to claim 1, characterized in that, The second process specifically includes: The internal resistance of the high-voltage linear regulator is directly increased, and the sampling current is monitored in real time. The process stops when the monitored sampling current is within the current range.

6. The overcurrent protection method based on a high-voltage linear regulator according to claim 1, characterized in that, Also includes: Step 3: Reanalyze the temperature change characteristics associated with the voltage drop adjustment process, identify whether the temperature change characteristics are gradually decreasing, and determine whether there is any abnormality in the high-voltage linear regulator based on the identification results.

7. The overcurrent protection method based on a high-voltage linear regulator according to claim 6, characterized in that, In step three, the specific method for identifying whether there is an abnormality in the high-voltage linear regulator is as follows: The changing trends of several sets of temperature data during a single pressure drop adjustment process are confirmed, and the average of the confirmed changing trends is processed to confirm the adjustment characteristics associated with this pressure drop adjustment process. The adjustment features associated with the adjustment process of multiple sets of internal resistance are sorted according to their time sequence to confirm the adjustment feature sequence. It is then identified whether the adjustment features associated with the adjustment feature sequence gradually decrease. If so, it means that there is no abnormality when the high-voltage linear regulator performs overcurrent protection. If not, it means that there is an abnormality in the high-voltage linear regulator, and a temperature change abnormality signal is directly generated for display.

8. An overcurrent protection system based on a high-voltage linear regulator, wherein the system operates according to the overcurrent protection method based on a high-voltage linear regulator as described in any one of claims 1-7, characterized in that, include: The sampling monitoring end monitors the sampling current related to the sampling end of the high-voltage linear regulator and transmits the real-time monitored sampling current to the signal generation end. At the signal generation end, the sampled current is compared with the preset current range. Based on the comparison result, it is determined whether a voltage drop process needs to be executed, and a voltage drop adjustment signal is generated simultaneously. The voltage drop adjustment processing end adjusts the internal resistance of the high-voltage linear regulator according to the generated voltage drop adjustment signal. During the process of increasing the internal resistance, the internal loss is checked simultaneously to see if it exceeds the standard. If it does, one or more sets of internal resistance adjustment processes are executed. The process stops when the temperature change trend is confirmed to meet the standard. If it does not exceed the standard, the internal resistance of the high-voltage linear regulator is adjusted directly. On the anomaly detection end, the temperature change characteristics associated with the voltage drop adjustment process are re-analyzed to identify whether the temperature change characteristics are gradually decreasing, and based on the identification results, it is determined whether there is an anomaly in the high-voltage linear regulator.

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