Fault monitoring method for DC-DC power supply system

Abstract

The invention relates to the field of power supply system fault monitoring, and particularly discloses a DC-DC power supply system fault monitoring method, which comprises the steps that a DC-DC power supply system is divided into a plurality of independent functional modules, and each module is responsible for specific power supply conversion and control functions and is provided with a corresponding fault monitoring unit; real-time fault monitoring is carried out on each functional module, and input voltage, output voltage and load current in each module and the working state of the module are detected through a fault monitoring unit; fine management and efficient monitoring of a complex power supply system are achieved, the system is divided into a plurality of independent function modules, each module is provided with a special fault monitoring unit, key parameters of a power supply conversion or control function can be accurately monitored in real time, the real-time performance and accuracy of data are improved, and the system reliability is improved. And the system can quickly identify fault conditions such as overvoltage, undervoltage or abnormal current.

Description

Technical Field

[0001] The invention belongs to the technical field of power supply system fault monitoring, and in particular relates to a DC-DC power supply system fault monitoring method. Background Art

[0002] The DC-DC power system, as a device for converting DC to DC, has the key function of converting the high voltage of the power battery (such as more than 300 volts) into a low voltage (usually 12V or 14V); the DC-DC power system has the characteristics of high efficiency, small size, and tolerance to harsh working environments. However, the DC-DC power system may encounter various faults during operation, such as failure to start, unstable output voltage, and low efficiency.

[0003] Traditional power system monitoring methods often rely on manual inspections or regular testing, which is not only time-consuming and labor-intensive, but also difficult to capture the moment when a fault occurs, resulting in insufficient real-time monitoring. Summary of the invention

[0004] The purpose of the present invention is to provide a DC-DC power supply system fault monitoring method to solve the problem that the prior art relies on manual inspection or periodic detection, which is not only time-consuming and labor-intensive, but also difficult to capture the moment when the fault occurs in time, resulting in insufficient real-time monitoring.

[0005] In order to solve the above technical problems, the present invention provides a DC-DC power system fault monitoring method, comprising the following steps:

[0006] Step A: Divide the DC-DC power supply system into multiple independent functional modules, each of which is responsible for a specific power conversion and control function and is equipped with a corresponding fault monitoring unit;

[0007] Step B: Perform real-time fault monitoring on each functional module, and detect the input voltage V in each functional module through the fault monitoring unit. in (t), output voltage V out (t), load current I load (t) and the working status of each functional module;

[0008] Step C: Compare the monitored data with a preset safety threshold, wherein the preset safety threshold includes the output voltage V out (t) Maximum value V out,max , minimum value V out,min And the current limit value I limit (t), when the monitoring data exceeds the safety threshold, it is determined that the corresponding functional module has a fault;

[0009] Step D: After a fault is detected, a fault alarm is immediately triggered and the fault information is sent to the central control system;

[0010] Step E: Based on the fault information, the central control system automatically identifies the type and location of the faulty module and starts a corresponding fault replacement program to remove the faulty module from the system and replace it with a spare module.

[0011] Preferably, in step A, the plurality of functional modules include an input filter module, a power conversion module, an output filter module and a control module, and each of the functional modules is equipped with an independent fault monitoring unit.

[0012] Preferably, in step B, the fault monitoring unit uses a high-precision sensor and an analog-to-digital converter to collect current and voltage data in each functional module in real time, and processes and analyzes the collected data through a digital signal processing algorithm, while monitoring the load current I load (t) and current limit value I limit (t) relationship.

[0013] Preferably, in the step C, it also includes: the output voltage V out (t) Overvoltage and undervoltage fault functions are defined as follows:

[0014]

[0015] Current overcurrent fault function F OC (t) is defined as follows:

[0016]

[0017] Preferably, in step C, the current limit value I limit (t) According to the feedback voltage V output by the error amplifier FB (t) and reference voltage V ref Calculated, taking into account the input voltage V in (t) changes with the switching frequency f switch (t) impact;

[0018] The feedback voltage V FB (t) The function is defined as follows:

[0019]

[0020] Among them, R1 and R2 are voltage-dividing resistors;

[0021] Current limit value I limit (t) The function is defined as follows:

[0022] I limit (t) = klimit ·(V ref -V FB (t));

[0023] Among them, V ref is the reference voltage, k limit is the current limiting gain;

[0024] Switching frequency f switch (t) The function is defined as follows:

[0025]

[0026] Among them, V in,nom is the nominal input voltage, f osc is the oscillator frequency, T switch (t) is the switching period.

[0027] Preferably, in step D, the fault alarm adopts a combination of sound and light alarm and remote communication alarm to ensure that an alarm can be promptly issued to operators and maintenance personnel when a fault is detected, and information on the fault type and location is provided.

[0028] Preferably, in step E, the fault replacement procedure includes automatic power-off, unlocking of the faulty module, docking of the spare module and re-powering on steps to achieve rapid replacement of the faulty module; wherein the spare module adopts a hot-swappable design and can be replaced without interrupting system power supply.

[0029] Preferably, it also includes a fault analysis step for performing a detailed analysis on the faulty module, determining the specific cause of the fault and a repair plan, and providing a basis for subsequent system maintenance and improvement.

[0030] Preferably, a system health monitoring step is also included to prevent the occurrence of potential failures by regularly performing health checks and maintenance on each functional module.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. The method of the present invention realizes refined management and efficient monitoring of complex power supply systems. The method of the present invention divides the system into multiple independent functional modules, each module is equipped with a special fault monitoring unit, and can monitor the key parameters of the power conversion or control function in real time and accurately, such as input voltage, output voltage, load current and working status. This subdivision and real-time monitoring approach not only improves the real-time and accuracy of the data, but also enables the system to quickly identify fault conditions such as overvoltage, undervoltage or current abnormality, thereby effectively avoiding equipment damage or safety accidents caused by power supply system failures.

[0033] 2. The present invention equips each functional module with an independent fault monitoring unit, and uses high-precision sensors and analog-to-digital converters to collect data in real time, combined with digital signal processing algorithms for analysis, which can more accurately identify the type and location of the fault, thereby improving the accuracy of fault detection.

[0034] 3. The present invention adopts a combination of sound and light alarm and remote communication alarm to ensure that fault information can be quickly conveyed to relevant personnel, thereby improving the timeliness of fault detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic flow chart of a DC-DC power supply system fault monitoring method provided by the present invention. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0037] Example 1

[0038] like Figure 1 As shown, the embodiment of the present invention specifically provides a DC-DC power supply system fault monitoring method, comprising the following steps:

[0039] Step A: Divide the DC-DC power supply system into multiple independent functional modules, each module is responsible for a specific power conversion and control function, and is equipped with a corresponding fault monitoring unit;

[0040] Step B: Perform real-time fault monitoring on each functional module, and detect the input voltage V in each module through the fault monitoring unit. in (t), output voltage V out (t), load current I load (t) and the working status of the module;

[0041] Step C: Compare the monitored data with the preset safety thresholds, including the maximum output voltage V out,max and minimum value V out,min , and the current limit value I limit (t), when the monitoring data exceeds these safety thresholds, it is determined that the corresponding functional module is faulty;

[0042] Specifically, the output voltage overvoltage and undervoltage fault function F OV / UV (t) is defined as follows:

[0043]

[0044] Current overcurrent fault function F OC (t) is defined as follows:

[0045]

[0046] Step D: After a fault is detected, a fault alarm is immediately triggered and the fault information is sent to the central control system;

[0047] Step E: Based on the fault information, the central control system automatically identifies the type and location of the faulty module and starts a corresponding fault replacement program to remove the faulty module from the system and replace it with a spare module.

[0048] As can be seen from the above, the method of the present invention first subdivides the complex DC-DC power supply system into multiple independent functional modules, each module is equipped with a dedicated fault monitoring unit, which is responsible for real-time monitoring of key parameters of power conversion or control functions. These monitoring units closely track the input voltage, output voltage, load current and working status of each module to ensure the real-time and accuracy of the data. By comparing and analyzing with the preset safety threshold, potential faults such as voltage overvoltage, undervoltage or current overcurrent can be quickly identified. Once an abnormality is detected, the system will immediately trigger the alarm mechanism and report detailed fault information to the central control system. The central control system uses this information to automatically identify the specific type and location of the faulty module, and quickly start the fault replacement program to automatically isolate the faulty module and replace it with a spare module, thereby minimizing system downtime and improving overall reliability and stability.

[0049] Example 2

[0050] This embodiment is basically the same as the above-mentioned embodiment 1, except that in step A, the functional module includes an input filter module, a power conversion module, an output filter module and a control module, and each module is equipped with an independent fault monitoring unit.

[0051] Specifically, in step B, the fault monitoring unit uses high-precision sensors and analog-to-digital converters to collect current and voltage data in each module in real time, and processes and analyzes the collected data through digital signal processing algorithms, while monitoring the load current I load (t) and current limit value I limit (t) relationship.

[0052] Specifically, in step C, the preset safety threshold includes the maximum value of the output voltage V out,max and minimum value V out,min ; At the same time, the current limit value I limit (t) According to the feedback voltage V output by the error amplifier FB (t) and reference voltage V refCalculated, taking into account the input voltage V in (t) changes with the switching frequency f switch (t) impact;

[0053] Feedback voltage V FB (t) The function is defined as follows:

[0054]

[0055] Among them, R1 and R2 are voltage-dividing resistors;

[0056] Current limit value I limit (t) The function is defined as follows:

[0057] I limit (t) = k limit ·(V ref -V FB (t));

[0058] Among them, V ref is the reference voltage, k limit is the current limiting gain;

[0059] Switching frequency f switch (t) The function is defined as follows:

[0060]

[0061] Among them, V in,nom is the nominal input voltage, f osc is the oscillator frequency, T switch (t) is the switching period;

[0062] Among them, the feedback voltage function is used to describe the sampling and feedback process of the output voltage in the DC-DC power supply system. In the power supply system, the voltage divider resistor network is used to divide the output voltage to a lower level so as to compare it with the reference voltage, thereby adjusting the output of the power supply;

[0063] The current limit value function is used to determine the maximum allowable output current of the power system to prevent the system from overload or short circuit. This function is calculated based on the output of the error amplifier and the reference voltage, and takes into account the impact of changes in the input voltage on the switching frequency.

[0064] The switching frequency function is used to describe the relationship between the switching frequency of the switching power supply in the DC-DC power supply system and the input voltage, oscillator frequency and switching period. The switching frequency is one of the important indicators of the power supply system performance, affecting the system efficiency, output ripple and electromagnetic interference.

[0065] The preset safety thresholds include the maximum and minimum values ​​of the output voltage, which are determined based on the design and application requirements of the power supply system. The maximum value of the output voltage is used to prevent system overvoltage, while the minimum value is used to prevent system undervoltage. When the actual output voltage exceeds these preset thresholds, the fault monitoring unit will trigger an alarm and take corresponding protective measures.

[0066] In addition, the current limit value is also one of the preset safety thresholds. It is used to limit the maximum output current of the power supply system to prevent damage caused by system overload or short circuit. The current limit value is determined according to the system's load capacity and heat dissipation conditions.

[0067] In summary, the above DC-DC power system fault monitoring solution can timely detect and warn system faults by real-time monitoring and analyzing the current and voltage data in each functional module and comparing them with the preset safety threshold. At the same time, through the preset fault replacement program, the faulty module can be quickly responded and replaced to ensure the stable operation of the system.

[0068] As can be seen from the above, the functional modules (including input filtering, power conversion, output filtering and control modules) in this embodiment are all equipped with independent fault monitoring units. These fault monitoring units use high-precision sensors and analog-to-digital converters to collect and process the current and voltage data in each module in real time, and use digital signal processing algorithms to perform in-depth analysis, and pay special attention to the relationship between the load current and the preset current limit value. In addition, this embodiment also sets a safe threshold range for the output voltage, and calculates the current limit value by comprehensively considering the influence of the error amplifier output, reference voltage and input voltage changes on the switching frequency. Among them, the feedback voltage, current limit value and switching frequency are all defined by specific functional relationships. These functions involve parameters such as voltage divider resistance, reference voltage, current limit gain, nominal input voltage, oscillator frequency and switching period. That is, by adding fault monitoring units and optimizing parameter calculations, the safety and stability of the system are improved.

[0069] Example 3

[0070] This embodiment is basically the same as the above-mentioned embodiment 2, except that, in step D, the fault alarm adopts a combination of sound and light alarm and remote communication alarm to ensure that an alarm can be promptly issued to operators and maintenance personnel when a fault is detected, and information on the fault type and location is provided.

[0071] Specifically, in step E, the fault replacement procedure includes automatic power off, unlocking the faulty module, docking the spare module and re-powering on, so as to achieve rapid replacement of the faulty module; the spare module adopts a hot-swappable design and can be replaced without interrupting the system power supply.

[0072] Specifically, it also includes a fault analysis step for conducting a detailed analysis of the faulty module, determining the specific cause of the fault and a repair plan, and providing a basis for subsequent system maintenance and improvement.

[0073] Specifically, it also includes system health monitoring steps to prevent potential failures by regularly performing health checks and maintenance on each functional module.

[0074] As can be seen from the above, in terms of fault alarm, the embodiment of the present invention adopts a combination of sound and light alarm and remote communication alarm to ensure that when any fault is detected, the operator and maintenance personnel can be notified quickly and accurately, and detailed fault type and location information can be provided. In addition, the fault replacement procedure has also been optimized, including steps such as automatic power-off, unlocking of faulty modules, docking of spare modules and re-powering on, so as to achieve rapid replacement of faulty modules. The spare module adopts a hot-swappable design to further improve the reliability and availability of the system. At the same time, a fault analysis step is added to conduct an in-depth analysis of the faulty module to determine the cause of the fault and the repair plan. Finally, through the system health monitoring step, the functional modules are regularly checked and maintained for health, which effectively prevents the occurrence of potential faults and provides a strong guarantee for the long-term stable operation of the system.

[0075] The present invention also provides the following specific application process:

[0076] Step A: System module division and fault monitoring unit configuration

[0077] System module division: First, the complex DC-DC power supply system is divided into multiple independent functional modules, such as input filter module, power conversion module, output filter module and control module. Each module is responsible for specific power conversion and control functions.

[0078] Fault monitoring unit configuration: A dedicated fault monitoring unit is configured for each functional module. These units are the core of system monitoring and are responsible for real-time monitoring of the operating status of each module.

[0079] Step B: Real-time fault monitoring and data collection

[0080] High-precision sensors and analog-to-digital converters: Use high-precision sensors to collect current and voltage data in each module in real time, and convert analog signals into digital signals through analog-to-digital converters for subsequent processing.

[0081] Digital signal processing algorithm: Use digital signal processing algorithm to process and analyze the collected data and extract key information, such as the relationship between load current and current limit value.

[0082] Step C: Data comparison and fault determination

[0083] Preset safety thresholds: Set the maximum and minimum output voltage, as well as the current limit value calculated based on system characteristics.

[0084] Data comparison: Compare the real-time monitored data with the preset safety threshold.

[0085] Fault determination: When the monitoring data exceeds the safety threshold, the corresponding functional module is determined to have a fault, such as output voltage overvoltage, undervoltage or current overcurrent.

[0086] Step D: Fault alarm and information sending

[0087] Sound and light alarm: When a fault is detected, the sound and light alarm device is immediately triggered to attract the attention of the operator.

[0088] Remote communication alarm: At the same time, the fault information is sent to the central control system and maintenance personnel through remote communication methods (such as SMS, email or dedicated communication protocol), providing information on the fault type and location.

[0089] Step E: Faulty module identification and replacement

[0090] Fault module identification: The central control system automatically identifies the type and location of the fault module based on the fault information received.

[0091] Fault replacement procedure: Start the corresponding fault replacement procedure, including automatic power off, unlocking the faulty module, docking the spare module and re-powering on. The spare module adopts hot-swappable design to ensure replacement without interrupting the system power supply.

[0092] Additional steps: Fault analysis and system health monitoring

[0093] Fault analysis: Analyze the faulty module in detail to determine the specific cause of the fault and the repair plan. This will help with subsequent system maintenance and improvement.

[0094] System health monitoring: Regularly perform health checks and maintenance on each functional module to prevent potential failures. Improve system reliability and stability by continuously monitoring and analyzing system status.

[0095] Through the implementation of the above steps, the present invention provides an efficient and accurate DC-DC power system fault monitoring method, which can monitor and warn system faults in real time, quickly respond to and replace faulty modules, and ensure stable operation of the system.

[0096] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A DC-DC power supply system fault monitoring method, characterized in that: The steps include: Step A: Divide the DC-DC power supply system into multiple independent functional modules, each of which is responsible for a specific power conversion and control function and is equipped with a corresponding fault monitoring unit; Step B: Perform real-time fault monitoring on each functional module, and detect the input voltage V in each functional module through the fault monitoring unit. in (t), output voltage V out (t), load current I load (t) and the working status of each functional module; Step C: Compare the monitored data with a preset safety threshold, wherein the preset safety threshold includes the output voltage V out The maximum value of (t) V out,max , minimum value V out,min And the current limit value I limit (t), when the monitoring data exceeds the safety threshold, it is determined that the corresponding functional module has a fault; Step D: After a fault is detected, a fault alarm is immediately triggered and the fault information is sent to the central control system; Step E: Based on the fault information, the central control system automatically identifies the type and location of the faulty module and starts a corresponding fault replacement program to remove the faulty module from the system and replace it with a spare module.

2. A DC-DC power system fault monitoring method according to claim 1, characterized in that: In step A, the plurality of functional modules include an input filter module, a power conversion module, an output filter module and a control module, and each of the functional modules is equipped with an independent fault monitoring unit.

3. A DC-DC power system fault monitoring method according to claim 1, characterized in that: In step B, the fault monitoring unit uses high-precision sensors and analog-to-digital converters to collect current and voltage data in each functional module in real time, and processes and analyzes the collected data through digital signal processing algorithms, while monitoring the load current I load (t) and current limit value I limit (t) relationship.

4. A DC-DC power system fault monitoring method as claimed in claim 1, characterized in that: In the step C, it also includes: the output voltage V out (t) Overvoltage and undervoltage fault functions are defined as follows: Current overcurrent fault function F OC (t) is defined as follows:

5. A DC-DC power system fault monitoring method according to claim 1, characterized in that: In step C, the current limit value I limit (t) According to the feedback voltage V output by the error amplifier FB (t) and reference voltage V ref Calculated, taking into account the input voltage V in (t) changes with the switching frequency f switch (t) impact; The feedback voltage V FB (t) The function is defined as follows: Among them, R1 and R2 are voltage-dividing resistors; Current limit value I limit (t) The function is defined as follows: Among them, V ref is the reference voltage, k limit is the current limiting gain; Switching frequency f switch (t) The function is defined as follows: Among them, V in,nom is the nominal input voltage, f osc is the oscillator frequency, T switch (t) is the switching period.

6. A DC-DC power system fault monitoring method according to claim 1, characterized in that: In step D, the fault alarm adopts a combination of sound and light alarm and remote communication alarm to ensure that an alarm can be issued to operators and maintenance personnel in a timely manner when a fault is detected, and information on the fault type and location is provided.

7. A DC-DC power system fault monitoring method according to claim 1, characterized in that: In step E, the fault replacement procedure includes automatic power-off, unlocking of the faulty module, docking of the spare module and re-powering on to achieve rapid replacement of the faulty module; wherein the spare module adopts a hot-swappable design and can be replaced without interrupting the system power supply.

8. A DC-DC power system fault monitoring method according to any one of claims 1 to 7, characterized in that: It also includes a fault analysis step, which is used to conduct a detailed analysis of the faulty module, determine the specific cause of the fault and the repair plan, and provide a basis for subsequent system maintenance and improvement.

9. A DC-DC power system fault monitoring method according to any one of claims 1 to 7, characterized in that: It also includes system health monitoring steps to prevent potential failures by regularly performing health checks and maintenance on each functional module.

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