Current limiting protection device and method for digital power supply

Abstract

The application belongs to the technical field of current limiting, and discloses a current limiting protection device and method for a digital power supply, which comprises a processor, a current collecting module and a current limiting control module; the input end of the current collecting module is electrically connected with the output end of the digital power supply, the current collecting module is used for collecting the real-time output current of the digital power supply and uploading the collected real-time output current of the digital power supply to the processor; the input end of the current limiting control module is electrically connected with the output end of the digital power supply, the output end of the current limiting control module is used for connecting a load, the controlled end of the current limiting control module is electrically connected with the control output end of the processor, and the response end of the current limiting control module is electrically connected with the current limiting signal generation end of the current collecting module; the current collecting module is further used for generating a first current limiting signal when the real-time output current of the digital power supply reaches an overcurrent preset value, so as to make the current limiting control module cut off the real-time output current of the digital power supply. The application improves the flexibility of current limiting protection and the current limiting effect.

Description

Technical Field

[0001] This invention belongs to the field of current limiting technology, specifically relating to a current limiting protection device and method for a digital power supply. Background Technology

[0002] Digital power supplies are power systems that use digital signal processors (DSPs) or microcontrollers (MCUs) to implement power control and management functions. Compared with traditional analog power supplies, digital power supplies have higher precision, better flexibility, and more powerful functions.

[0003] Current limiting protection is a key technology to ensure that digital power supplies are not damaged under abnormal conditions. Current limiting protection can improve the reliability and stability of power supply systems and reduce system failures and downtime.

[0004] In existing technologies, current limiting protection often employs the following methods:

[0005] 1. Fixed threshold current limiting protection: By setting a fixed current threshold, when the current exceeds this threshold, the protection circuit will activate, cutting off the power supply or reducing the output current.

[0006] 2. Resettable fuse: This type of fuse heats up and increases resistance when overcurrent occurs, thus limiting the current. Once the overcurrent condition disappears, the fuse cools down and returns to its low-resistance state.

[0007] 3. Circuit breaker: When an overcurrent is detected, the circuit breaker will open the circuit and cut off the current.

[0008] The aforementioned current limiting protection methods all cut off the current after a certain current threshold is reached to prevent overcurrent. They cannot provide current limiting protection in advance before an overcurrent occurs, and the effect of current limiting protection is relatively poor. Summary of the Invention

[0009] The purpose of this invention is to provide a current limiting protection device and method for digital power supplies, in order to solve the problem that existing current limiting protection methods all cut off the current after reaching a certain current threshold, and cannot perform current limiting protection in advance before overcurrent occurs, resulting in relatively poor current limiting protection effect.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] In a first aspect, the present invention provides a current limiting protection device for a digital power supply, the device comprising: a processor, a current acquisition module, and a current limiting control module;

[0012] The input terminal of the current acquisition module is electrically connected to the output terminal of the digital power supply. The current acquisition module is used to acquire the real-time output current of the digital power supply and upload the acquired real-time output current of the digital power supply to the processor.

[0013] The input terminal of the current limiting control module is electrically connected to the output terminal of the digital power supply, the output terminal of the current limiting control module is used to connect to the load, the controlled terminal of the current limiting control module is electrically connected to the control output terminal of the processor, and the response terminal of the current limiting control module is electrically connected to the current limiting signal generation terminal of the current acquisition module.

[0014] The current acquisition module is also used to generate a first current limiting signal when the real-time output current of the digital power supply reaches the overcurrent preset value. The first current limiting signal is used to cause the current limiting control module to cut off the real-time output current of the digital power supply.

[0015] The processor is used to: analyze the received real-time output current of the digital power supply, and generate a second current limiting signal when the real-time output current of the digital power supply meets the preset current limiting condition. The second current limiting signal is used to cause the current limiting control module to cut off the real-time output current of the digital power supply.

[0016] Preferably, the current acquisition module includes: a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor, a first transistor and a second transistor;

[0017] The first end of the first resistor and the first end of the third resistor are used as the input terminals of the current acquisition module and are electrically connected to the positive terminal of the digital power supply. The second end of the first resistor is electrically connected to the first end of the second resistor and the emitter of the second transistor, respectively.

[0018] The second end of the third resistor is electrically connected to the emitter of the first transistor and the first end of the fourth resistor, respectively. The common terminal formed by the second end of the third resistor, the emitter of the first transistor, and the first end of the fourth resistor is used as the current limiting signal output terminal to send the first current limiting signal to the current limiting control module. The common terminal of the first resistor and the second resistor is used as the current output terminal and electrically connected to the current receiving terminal of the processor.

[0019] The second end of the fourth resistor is electrically connected to the base of the first transistor and the collector of the second transistor, respectively; the collector of the first transistor is electrically connected to the base of the second transistor and the first end of the fifth resistor, respectively.

[0020] The second terminal of the fifth resistor and the second terminal of the second resistor are both grounded.

[0021] Preferably, the current limiting control module includes: a control chip, a first diode, a first capacitor, a sixth resistor, a seventh resistor, a third transistor, and a fourth transistor;

[0022] The signal detection terminal of the control chip is connected to the first terminal of the first capacitor and the positive terminal of the first diode, respectively. The negative terminal of the first diode is used as the response terminal of the current limiting control module and is electrically connected to the current limiting signal output terminal of the current acquisition module.

[0023] The control signal output terminal of the control chip is electrically connected to the first terminal of the seventh resistor, the second terminal of the seventh resistor is electrically connected to the first terminal of the sixth resistor and the base of the third transistor, and the collector of the third transistor is electrically connected to the base of the fourth transistor.

[0024] The second terminal of the sixth resistor, the emitter of the third transistor, and the collector of the fourth transistor are all electrically connected to the positive terminal of the digital power supply.

[0025] The ground terminal of the control chip and the second terminal of the first capacitor are both grounded.

[0026] Preferably, the processor's control output terminal includes a first control output terminal and a second control output terminal, and the current limiting control module further includes: a sixth transistor, a tenth resistor, and an eleventh resistor;

[0027] The emitter of the sixth transistor and the first end of the tenth resistor are both electrically connected to the positive terminal of the digital power supply. The base of the sixth transistor is electrically connected to the second end of the tenth resistor and the first end of the eleventh resistor, respectively. The collector of the sixth transistor is electrically connected to the power supply terminal of the control chip.

[0028] The second end of the eleventh resistor is grounded, and the common terminal formed by the second end of the tenth resistor, the base of the sixth transistor, and the first end of the eleventh resistor serves as the controlled terminal of the current limiting control module and is electrically connected to the first control output terminal of the processor.

[0029] Preferably, the current limiting control module includes: a fifth transistor and a ninth resistor, wherein the collector of the fifth transistor is electrically connected to the signal detection terminal of the control chip, the base of the fifth transistor is electrically connected to the first terminal of the ninth resistor, the second terminal of the ninth resistor is electrically connected to the second control output terminal of the processor, and the emitter of the fifth transistor is grounded.

[0030] Secondly, the present invention provides a current limiting protection method for a digital power supply, the method being implemented based on a processor of the aforementioned current limiting protection device for a digital power supply, the method comprising:

[0031] Obtain the real-time output current of the digital power supply;

[0032] Determine whether the real-time output current of the digital power supply meets the preset current limiting condition;

[0033] If so, a second current-limiting signal is generated, which is used to cause the current-limiting control module to cut off the real-time output current of the digital power supply.

[0034] Preferably, determining whether the real-time output current of the digital power supply meets the preset current limiting condition includes:

[0035] Current levels are constructed based on overcurrent preset values. Each current level corresponds to a current range. Each current level has a preset transient change threshold. The preset transient change threshold of each current level is used as the preset current limiting condition.

[0036] When the real-time output current of the digital power supply is less than the overcurrent preset value, calculate the transient rate of change of the real-time output current of the digital power supply.

[0037] Determine the current level of the real-time output current of the digital power supply and the corresponding transient change threshold of that current level;

[0038] Determine whether the transient rate of change of the real-time output current of the digital power supply exceeds the transient rate of change threshold corresponding to the current level. If yes, it indicates that the real-time output current of the digital power supply meets the preset current limiting condition; otherwise, it indicates that the real-time output current of the digital power supply does not meet the preset current limiting condition.

[0039] Preferably, the method further includes:

[0040] Determine if there are any sudden changes in the real-time output current of the digital power supply;

[0041] If so, record the moment of the mutation, and based on the moment of the mutation and the preset recovery time, generate an output restart pulse. The output restart pulse is used to cut off the input power of the current limiting control module so as to restart the current limiting control module.

[0042] Preferably, the method further includes:

[0043] A current sequence is constructed based on the time of the abrupt change and the output current before the abrupt change.

[0044] Determine whether the current sequence meets the preset warning conditions; if so, generate a warning message.

[0045] Visualized early warnings based on early warning information.

[0046] Preferably, the preset warning conditions include at least: within a preset time period, the number of output currents with abrupt changes in the current sequence exceeds a preset number, or the time interval between each two adjacent output currents with abrupt changes in the current sequence gradually shortens.

[0047] Beneficial effects:

[0048] The circuit protection device of this application mainly consists of a processor, a current acquisition module, and a current limiting control module. The current limiting control module uses a threshold method for current limiting protection. At the same time, the processor can analyze the real-time output current of the digital power supply acquired by the current acquisition module to determine whether the real-time output current of the digital power supply meets the preset current limiting conditions. When the preset current limiting conditions are met, the processor can realize early current limiting protection for the digital power supply, thereby improving the flexibility and effectiveness of current limiting protection. Attached Figure Description

[0049] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0050] Figure 1 This is a block diagram of a current limiting protection device for a digital power supply provided in one embodiment of the present invention;

[0051] Figure 2 This is a schematic diagram of a current limiting protection device for a digital power supply provided in one embodiment of the present invention;

[0052] Figure 3 This is a flowchart of a current limiting protection method for a digital power supply provided in one embodiment of the present invention.

[0053] Explanation of reference numerals in the attached figures:

[0054] R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; R10, tenth resistor; R11, eleventh resistor; C1, first capacitor; C2, second capacitor; D1, first diode; D2, second diode; Q1, first transistor; Q2, second transistor; Q3, third transistor; Q4, fourth transistor; Q5, fifth transistor; Q6, sixth transistor; U2, control chip; C2, second capacitor; D2, second diode; R8, eighth resistor. Detailed Implementation

[0055] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is 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. It should be noted that the description of these embodiments is for the purpose of helping to understand the present invention, but does not constitute a limitation of the present invention.

[0056] Example 1

[0057] Figure 1 This is a block diagram of a current-limiting protection device for a digital power supply according to one embodiment of the present invention. Figure 1 As shown, this embodiment provides a current limiting protection device for a digital power supply. The device includes a processor, a current acquisition module, and a current limiting control module. In this embodiment, the processor can be a digital signal processor (DSP) or a microcontroller (MCU), such as an STM32 series microcontroller. The input terminal of the current acquisition module is electrically connected to the output terminal of the digital power supply, the input terminal of the current limiting control module is electrically connected to the output terminal of the digital power supply, the output terminal of the current limiting control module is used to connect to a load, the controlled terminal of the current limiting control module is electrically connected to the control output terminal of the processor, and the response terminal of the current limiting control module is electrically connected to the current limiting signal generation terminal of the current acquisition module.

[0058] The current acquisition module is used to acquire the real-time output current of the digital power supply and upload the acquired real-time output current of the digital power supply to the processor. The processor can analyze the received real-time output current of the digital power supply to determine the current output status of the digital power supply. When the real-time output current of the digital power supply meets the preset current limiting condition, it indicates that the output current of the digital power supply is deteriorating, which will lead to overcurrent. Therefore, a second current limiting signal is generated, and the second current limiting signal is used to control the current limiting control module to cut off the real-time output current of the digital power supply, thereby achieving early cut-off of the output current.

[0059] The current acquisition module is further configured to generate a first current limiting signal when the real-time output current of the digital power supply reaches an overcurrent preset value. The first current limiting signal is used to cause the current limiting control module to cut off the real-time output current of the digital power supply. In this embodiment, the current limiting control module can also adopt threshold current limiting protection. When a short circuit fault occurs in the load, the instantaneous current generated will be very large. Since the processor needs a certain processing time to analyze the real-time output current of the digital power supply, there is a certain lag in the response. Therefore, it cannot quickly respond to the overcurrent caused by the short circuit. However, by using threshold current limiting, a short circuit fault can be quickly responded to, so as to cut off the output of the digital power supply and avoid damage to the digital power supply.

[0060] In this embodiment, the digital power supply has an input voltage of 220V AC and an output voltage of 12V~36V DC. Therefore, the digital power supply includes components such as a transformer and a rectifier. The transformer is used for voltage reduction, and the rectifier is used to rectify the reduced AC power into DC power. These components are conventional devices in digital power supplies, and their specific structures are not described in detail in this embodiment.

[0061] As a further optimization of this embodiment, such as Figure 2 As shown, the current acquisition module includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5, a first transistor Q1 and a second transistor Q2, wherein the first transistor Q1 and the second transistor Q2 are both PNP transistors. When the voltage at the emitter of the PNP transistor is greater than the voltage at the base, the PNP transistor is turned on.

[0062] The first end of the first resistor R1 and the first end of the third resistor R3 are used as the input terminals of the current acquisition module and are electrically connected to the positive terminal of the digital power supply. The second end of the first resistor R1 is electrically connected to the first end of the second resistor R2 and the emitter of the second transistor Q2, respectively.

[0063] The second end of the third resistor R3 is electrically connected to the emitter of the first transistor and the first end of the fourth resistor R4, respectively. The common terminal formed by the second end of the third resistor R3, the emitter of the first transistor, and the first end of the fourth resistor R4 serves as the current limiting signal output terminal, sending the first current limiting signal to the current limiting control module. The common terminal of the first resistor R1 and the second resistor R2 serves as the current output terminal, electrically connected to the current receiving terminal of the processor. Figure 2 The Isa port in;

[0064] The second end of the fourth resistor R4 is electrically connected to the base of the first transistor Q1 and the collector of the second transistor Q2, respectively; the collector of the first transistor Q1 is electrically connected to the base of the second transistor Q2 and the first end of the fifth resistor R5, respectively.

[0065] The second terminal of the fifth resistor R5 and the second terminal of the second resistor R2 are both grounded.

[0066] In this embodiment, with Figure 2 The positive terminal on the left is connected to the positive terminal of the digital power supply. Figure 2 The positive terminal on the right is connected to the positive terminal of the load, and the device's common ground is not located in the vicinity. Figure 2 The diagram shows the current flowing through the second resistor R2 after the load is connected. This current creates a voltage drop across the first terminal of the second resistor R2. The resistance value of the second resistor R2 can be set to change the magnitude of this voltage drop; therefore, the second resistor R2 can be an adjustable resistor. When the load is working normally, the current of the device is normal. At this time, the potential voltage generated at the first terminal of the second resistor R2 is less than the conduction voltage of the second transistor, and the second transistor Q2 is in the off state.

[0067] When the load current increases to the point of overcurrent, the current in the circuit formed by the first resistor R1 and the second resistor R2 will also increase. The potential voltage at the first end of the second resistor R2 will increase. During overcurrent, the potential voltage generated at the first end of the second resistor R2 can turn on the second transistor Q2. After the second transistor Q2 turns on, a voltage difference is generated between the potential at the first end and the potential at the second end of the fourth resistor R4. This voltage difference can turn on the first transistor Q1. After the first transistor Q1 turns on, the emitter of the first transistor Q1 changes from a high potential to a low potential. The potential change at the emitter of the first transistor Q1 can serve as the first current limiting signal.

[0068] As a further optimization of this embodiment, such as Figure 2 As shown, the current limiting control module includes: a control chip U2, a first diode D1, a first capacitor C1, a sixth resistor R6, a seventh resistor R7, a third transistor, and a fourth transistor Q4; in this embodiment, the control chip U2 can be an LM723 or MC1723 chip.

[0069] The signal detection terminal of the control chip U2 is connected to the first terminal of the first capacitor C1 and the positive terminal of the first diode D1, respectively. The negative terminal of the first diode D1 is used as the response terminal of the current limiting control module and is electrically connected to the current limiting signal output terminal of the current acquisition module.

[0070] The control signal output terminal of the control chip U2 is electrically connected to the first terminal of the seventh resistor R7. The second terminal of the seventh resistor R7 is electrically connected to the first terminal of the sixth resistor R6 and the base of the third transistor Q3. The collector of the third transistor Q3 is electrically connected to the base of the fourth transistor Q4.

[0071] The second terminal of the sixth resistor R6, the emitter of the third transistor Q3, and the collector of the fourth transistor Q4 are all electrically connected to the positive terminal of the digital power supply.

[0072] The ground terminal of the control chip U2 and the second terminal of the first capacitor C1 are both grounded.

[0073] In this embodiment, when an overcurrent occurs, the emitter potential of the first transistor Q1 changes from high to low. At this time, the cathode of the first diode D1 is at a low level, and the first diode D1 conducts. The signal detection terminal of the control chip U2 changes from high to low. After detecting the low level, the control signal output terminal of the control chip U2 outputs a high potential (while the control signal output terminal of the control chip U2 remains at a low potential). At this time, the base of the third transistor Q3 is at a high potential, and the voltage difference between the emitter and base of the third transistor Q3 cannot reach the conduction voltage. Therefore, the third transistor Q3 is in a cutoff state, and its collector is at a low potential. Simultaneously, the base of the fourth transistor Q4 is at a low potential, and the fourth transistor Q4 is in a cutoff state. This disconnects the digital power supply from the load, providing overcurrent protection.

[0074] As a further optimization of this embodiment, the control output terminal of the processor includes a first control output terminal and a second control output terminal, and the current limiting control module further includes: a sixth transistor Q6, a tenth resistor R10 and an eleventh resistor R11; wherein, the sixth transistor Q6 is an NPN transistor.

[0075] The emitter of the sixth transistor Q6 and the first end of the tenth resistor R10 are both electrically connected to the positive terminal of the digital power supply. The base of the sixth transistor Q6 is electrically connected to the second end of the tenth resistor R10 and the first end of the eleventh resistor R11, respectively. The collector of the sixth transistor Q6 is electrically connected to the power supply terminal of the control chip U2.

[0076] The second end of the eleventh resistor R11 is grounded, and the common terminal formed by the second end of the tenth resistor R10, the base of the sixth transistor Q6, and the first end of the eleventh resistor R11 serves as the controlled terminal of the current limiting control module and is electrically connected to the first control output terminal of the processor.

[0077] In this embodiment, since the control signal output terminal of the control chip U2 remains at a high potential after outputting a high potential, the third transistor Q3 and the fourth transistor Q4 will remain in the off state and cannot output digital power again. In this embodiment, the sixth transistor Q6, the tenth resistor R10, and the eleventh resistor R11 are deployed on the power input terminal of the control chip U2. The common terminal formed by the second end of the tenth resistor R10, the base of the sixth transistor Q6, and the first end of the eleventh resistor R11 is electrically connected to the processor. Figure 2 At the Clr2 terminal of the processor, when there is no signal output at the first control output terminal, there is a potential difference between the emitter and base of the sixth transistor Q6. At this time, the sixth transistor Q6 is in the conducting state, and the power input terminal of the control chip U2 is connected to the positive terminal of the digital power supply.

[0078] After the control signal output terminal of control chip U2 outputs a high potential, in order to restore the control signal output terminal of control chip U2 to a low potential, the processor generates a pulse signal, which is applied to the Clr2 terminal, so that the potential difference between the emitter and base of the sixth transistor Q6 is zero or the generated potential difference is insufficient to turn on the sixth transistor Q6; this pulse signal (i.e., the restart pulse in embodiment two) can keep the sixth transistor Q6 in the off state for a period of time, cut off the connection between control chip U2 and digital power supply, and power off control chip U2; after the pulse signal ends, the sixth transistor Q6 turns on again, control chip U2 is reconnected to digital power supply, control chip U2 is powered on again and initialized, and the control signal output terminal of control chip U2 returns to a low potential; after the control signal output terminal of control chip U2 returns to a low potential, the third transistor Q3 and the fourth transistor Q4 turn on again, and the digital power supply can output power.

[0079] As a further optimization of this embodiment, such as Figure 2 As shown, the current limiting control module further includes: a fifth transistor Q5 and a ninth resistor R9. The collector of the fifth transistor Q5 is electrically connected to the signal detection terminal of the control chip U2, the base of the fifth transistor Q5 is electrically connected to the first terminal of the ninth resistor R9, the second terminal of the ninth resistor R9 is electrically connected to the second control output terminal of the processor, and the emitter of the fifth transistor Q7 is grounded.

[0080] In this embodiment, when the real-time output current of the digital power supply meets the preset current limiting condition, it indicates that the output current of the digital power supply is deteriorating, which may lead to overcurrent. Therefore, a second current limiting signal is generated, which is needed to cut off the real-time output current of the digital power supply. To achieve this function, this embodiment deploys a fifth transistor Q5 and a ninth resistor R9 at the signal detection terminal of the control chip U2. The second terminal of the ninth resistor R9 is used as the Clr1 terminal and electrically connected to the processor. The second current limiting signal can be a high-level signal output by the processor. When the Clr1 terminal is high, the fifth transistor Q5 is turned on, causing the signal detection terminal of the control chip U2 to change from a high potential to a low potential. When the signal detection terminal of the control chip U2 detects a low potential, the control signal output terminal of the control chip U2 changes from a low potential to a high potential, causing the third transistor Q3 and the fourth transistor Q4 to be in the cutoff state, cutting off the output of the digital power supply, thereby achieving early cutoff of the output current.

[0081] As a further optimization of this embodiment, the current limiting protection device also includes: a second capacitor C2, an eighth resistor R8, and a second diode D2. The second capacitor C2, the eighth resistor R8, and the second diode D are connected in parallel to the emitter of the fourth transistor Q4 to perform functions such as output filtering of the digital power supply and reverse connection protection.

[0082] Example 2

[0083] Figure 3 This is a flowchart of a current-limiting protection method for a digital power supply provided in one embodiment of the present invention. Figure 3 As shown, this embodiment provides a current limiting protection method for a digital power supply. The method is implemented based on the processor of the current limiting protection device for the digital power supply in Embodiment 1. The method includes:

[0084] Step S10: Obtain the real-time output current of the digital power supply; In this embodiment, the voltage at the Isa terminal is collected, which is the voltage of the second resistor R2. After collecting the voltage at the Isa terminal, the corresponding real-time output current of the digital power supply can be calculated based on the resistance value of the second resistor; The current limiting protection device also has a memory to store the real-time output current of the digital power supply in the memory.

[0085] Step S20: Determine whether the real-time output current of the digital power supply meets the preset current limiting condition.

[0086] Step S30: If yes, generate a second current limiting signal, which is used to cause the current limiting control module to cut off the real-time output current of the digital power supply.

[0087] In this embodiment, the working principle of the current limiting control module cutting off the real-time output current of the digital power supply according to the second current limiting signal has been explained in detail in Embodiment 1.

[0088] As a further optimization of this embodiment, determining whether the real-time output current of the digital power supply meets the preset current limiting condition includes:

[0089] Step a10: Construct current levels based on overcurrent preset values. Each current level corresponds to a current range, and each current level has a preset transient change threshold. The preset transient change threshold for each current level serves as the preset current limiting condition. In this embodiment, during the use of the digital power supply, although the load does not experience overcurrent, frequent and significant instantaneous current changes in the circuit indicate some potential faults. These could include: power supply voltage fluctuations or transient voltage changes leading to a sudden increase in current; capacitor or inductor failure; circuit aging; and rapid switching of electrical loads. These potential faults could disrupt the normal operation of the digital power supply. Furthermore, the change thresholds corresponding to different current levels are different. For example, when the current is small, a sudden large transient change indicates some hidden faults in the circuit.

[0090] Step a20: When the real-time output current of the digital power supply is less than the overcurrent preset value, calculate the transient rate of change of the real-time output current of the digital power supply.

[0091] Step a30: Determine the current level of the real-time output current of the digital power supply and the transient change threshold corresponding to that current level.

[0092] Step a40: Determine whether the transient rate of change of the real-time output current of the digital power supply exceeds the transient rate of change threshold corresponding to the current level. If yes, it indicates that the real-time output current of the digital power supply meets the preset current limiting condition; if no, it indicates that the real-time output current of the digital power supply does not meet the preset current limiting condition.

[0093] Therefore, this embodiment achieves early protection of the digital power supply by analyzing the rate of change of the output current of the digital power supply, thereby improving the safety and reliability of the digital power supply operation.

[0094] As a further optimization of this embodiment, the method further includes:

[0095] Step b10: Determine if there is a sudden change in the real-time output current of the digital power supply.

[0096] Step b20: If yes, record the time of the mutation, and based on the time of the mutation and the preset recovery time, generate an output restart pulse. The output restart pulse is used to cut off the input power of the current limiting control module so as to restart the current limiting control module.

[0097] In this embodiment, the restart procedure of the current limiting control module has been specifically described in Embodiment 1. During the restart process, assuming that the overcurrent fault of the load has not been eliminated and overcurrent still exists, the current limiting control module will immediately disconnect the digital power supply from the load after restarting. Therefore, if overcurrent still exists after two restarts, an overcurrent alarm will be generated. The current limiting protection device in Embodiment 1 also integrates a communication module, which is used to send the overcurrent alarm to the corresponding management personnel for remote alarm. Alternatively, an alarm can be generated locally, producing an audible and visual alarm signal to alert staff.

[0098] As a further optimization of this embodiment, the method further includes:

[0099] Step c10: Construct a current sequence based on the time of the abrupt change and the output current before the abrupt change.

[0100] Step c20: Determine whether the current sequence meets the preset warning conditions. If so, generate warning information. The preset warning conditions include at least the following: within a preset time period, the number of output currents with abrupt changes in the current sequence exceeds a preset number or the interval between each two adjacent output currents with abrupt changes in the current sequence gradually shortens.

[0101] In this embodiment, each sudden change represents a cutoff of the digital power supply output, which may be due to overcurrent or a potential circuit fault causing a sudden change in current. As the number of sudden changes increases, the health status of the circuit can be determined. If a preset alarm condition exists, it indicates that the health status of the circuit is gradually deteriorating, requiring timely warning to inform management personnel to maintain and repair the circuit, preventing it from developing into a safety accident, and further improving the safety and reliability of the power supply operation.

[0102] Step c30: Visualize the warning based on the warning information. In this embodiment, the warning information can be issued locally or remotely.

[0103] This invention analyzes the real-time output current of the digital power supply acquired by the current acquisition module to determine whether the real-time output current of the digital power supply meets the preset current limiting conditions. When the preset current limiting conditions are met, the invention achieves advance current limiting protection for the digital power supply, thereby improving the flexibility and effectiveness of the current limiting protection.

[0104] Example 3

[0105] This embodiment also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the current limiting protection method for digital power supply in Embodiment 2.

[0106] This embodiment also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the current limiting protection method for digital power supplies in Embodiment 2.

[0107] This invention analyzes the real-time output current of the digital power supply acquired by the current acquisition module to determine whether the real-time output current of the digital power supply meets the preset current limiting conditions. When the preset current limiting conditions are met, the invention achieves advance current limiting protection for the digital power supply, thereby improving the flexibility and effectiveness of the current limiting protection.

[0108] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0109] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0110] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A current-limiting protection device for a digital power supply, characterized in that, The device includes: a processor, a current acquisition module, and a current limiting control module; The input terminal of the current acquisition module is electrically connected to the output terminal of the digital power supply. The current acquisition module is used to acquire the real-time output current of the digital power supply and upload the acquired real-time output current of the digital power supply to the processor. The input terminal of the current limiting control module is electrically connected to the output terminal of the digital power supply, the output terminal of the current limiting control module is used to connect to the load, the controlled terminal of the current limiting control module is electrically connected to the control output terminal of the processor, and the response terminal of the current limiting control module is electrically connected to the current limiting signal generation terminal of the current acquisition module. The current acquisition module is also used to generate a first current limiting signal when the real-time output current of the digital power supply reaches the overcurrent preset value. The first current limiting signal is used to cause the current limiting control module to cut off the real-time output current of the digital power supply. The processor is used to: analyze the received real-time output current of the digital power supply, and generate a second current limiting signal when the real-time output current of the digital power supply meets the preset current limiting condition. The second current limiting signal is used to cause the current limiting control module to cut off the real-time output current of the digital power supply. The current acquisition module includes: a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a first transistor (Q1), and a second transistor (Q2); The first end of the first resistor (R1) and the first end of the third resistor (R3) are used as the input terminals of the current acquisition module and are electrically connected to the positive terminal of the digital power supply. The second end of the first resistor (R1) is electrically connected to the first end of the second resistor (R2) and the emitter of the second transistor (Q2). The second end of the third resistor (R3) is electrically connected to the emitter of the first transistor (Q1) and the first end of the fourth resistor (R4). The common terminal formed by the second end of the third resistor (R3), the emitter of the first transistor (Q1), and the first end of the fourth resistor (R4) is used as the current limiting signal output terminal to send the first current limiting signal to the current limiting control module. The common terminal of the first resistor (R1) and the second resistor (R2) is used as the current output terminal and electrically connected to the current receiving terminal of the processor. The second end of the fourth resistor (R4) is electrically connected to the base of the first transistor (Q1) and the collector of the second transistor (Q2); the collector of the first transistor (Q1) is electrically connected to the base of the second transistor (Q2) and the first end of the fifth resistor (R5). The second terminal of the fifth resistor (R5) and the second terminal of the second resistor (R2) are both grounded.

2. The current limiting protection device for a digital power supply according to claim 1, characterized in that, The current limiting control module includes: a control chip (U2), a first diode (D1), a first capacitor (C1), a sixth resistor (R6), a seventh resistor (R7), a third transistor (Q3), and a fourth transistor (Q4). The signal detection terminal of the control chip (U2) is connected to the first terminal of the first capacitor (C1) and the positive terminal of the first diode (D1) respectively. The negative terminal of the first diode (D1) is used as the response terminal of the current limiting control module and is electrically connected to the current limiting signal output terminal of the current acquisition module. The control signal output terminal of the control chip (U2) is electrically connected to the first terminal of the seventh resistor (R7), the second terminal of the seventh resistor (R7) is electrically connected to the first terminal of the sixth resistor (R6) and the base of the third transistor (Q3), and the collector of the third transistor (Q3) is electrically connected to the base of the fourth transistor (Q4). The second terminal of the sixth resistor (R6), the emitter of the third transistor (Q3), and the collector of the fourth transistor (Q4) are all electrically connected to the positive terminal of the digital power supply. The ground terminal of the control chip (U2) and the second terminal of the first capacitor (C1) are both grounded.

3. The current limiting protection device for a digital power supply according to claim 2, characterized in that, The processor's control output terminals include a first control output terminal and a second control output terminal, and the current limiting control module further includes: a sixth transistor (Q6), a tenth resistor (R10), and an eleventh resistor (R11). The emitter of the sixth transistor (Q6) and the first terminal of the tenth resistor (R10) are both electrically connected to the positive terminal of the digital power supply. The base of the sixth transistor (Q6) is electrically connected to the second terminal of the tenth resistor (R10) and the first terminal of the eleventh resistor (R11), respectively. The collector of the sixth transistor (Q6) is electrically connected to the power supply terminal of the control chip (U2). The second end of the eleventh resistor (R11) is grounded. The common terminal formed by the second end of the tenth resistor (R10), the base of the sixth transistor (Q6), and the first end of the eleventh resistor (R11) serves as the controlled terminal of the current limiting control module and is electrically connected to the first control output terminal of the processor.

4. The current limiting protection device for a digital power supply according to claim 3, characterized in that, The current limiting control module further includes a fifth transistor (Q5) and a ninth resistor (R9). The collector of the fifth transistor (Q5) is electrically connected to the signal detection terminal of the control chip (U2), the base of the fifth transistor (Q5) is electrically connected to the first terminal of the ninth resistor (R9), the second terminal of the ninth resistor (R9) is electrically connected to the second control output terminal of the processor, and the emitter of the fifth transistor (Q5) is grounded.

5. A current-limiting protection method for a digital power supply, said method being implemented using a processor based on the current-limiting protection device for a digital power supply according to any one of claims 1-4, characterized in that, The method includes: Obtain the real-time output current of the digital power supply; Determine whether the real-time output current of the digital power supply meets the preset current limiting conditions, including: Current levels are constructed based on overcurrent preset values. Each current level corresponds to a current range. Each current level has a preset transient change threshold. The preset transient change threshold of each current level is used as the preset current limiting condition. When the real-time output current of the digital power supply is less than the overcurrent preset value, calculate the transient rate of change of the real-time output current of the digital power supply. Determine the current level of the real-time output current of the digital power supply and the corresponding transient change threshold of that current level; Determine whether the transient rate of change of the real-time output current of the digital power supply exceeds the transient rate of change threshold corresponding to the current level. If yes, it indicates that the real-time output current of the digital power supply meets the preset current limiting condition; otherwise, it indicates that the real-time output current of the digital power supply does not meet the preset current limiting condition. If so, a second current-limiting signal is generated, which is used to cause the current-limiting control module to cut off the real-time output current of the digital power supply.

6. The current limiting protection method for a digital power supply according to claim 5, characterized in that, The method further includes: Determine if there are any sudden changes in the real-time output current of the digital power supply; If so, record the moment of the mutation, and based on the moment of the mutation and the preset recovery time, generate an output restart pulse. The output restart pulse is used to cut off the input power of the current limiting control module so as to restart the current limiting control module.

7. The current limiting protection method for a digital power supply according to claim 6, characterized in that, The method further includes: A current sequence is constructed based on the time of the abrupt change and the output current before the abrupt change. Determine whether the current sequence meets the preset warning conditions; if so, generate a warning message. Visualized early warning based on early warning information.

8. The current limiting protection method for a digital power supply according to claim 7, characterized in that, The preset warning conditions include at least the following: within a preset time period, the number of output currents with abrupt changes in the current sequence exceeds a preset number, or the time interval between each two adjacent output currents with abrupt changes in the current sequence gradually shortens.

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