Current-limiting protection device and method for digital power supply

Abstract

The invention belongs to the technical field of current limiting, and discloses a current limiting protection device and method for a digital power supply, and the device comprises a processor, a current collection module, and a current limiting control module. The input end of the current acquisition module is electrically connected with the output end of the digital power supply, and the current acquisition module is used for acquiring the real-time output current of the digital power supply and uploading the acquired 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 acquisition module; and the current acquisition module is also 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 that the current limiting control module cuts off the real-time output current of the digital power supply. According to the invention, the flexibility of current-limiting protection and the current-limiting effect are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of current limiting, and in particular relates to a current limiting protection device and method for a digital power supply. Background Art

[0002] Digital power refers to a power supply system that uses a digital signal processor (DSP) or microcontroller (MCU) to implement power control and management functions. Compared with traditional analog power supplies, digital power supplies have higher accuracy, 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 the power supply system and reduce system failures and downtime.

[0004] In the prior art, current limiting protection often adopts the following methods: 1. Fixed threshold current limiting protection: By setting a fixed current threshold, when the current exceeds this threshold, the protection circuit will be activated to cut off the power supply or reduce the output current; 2. Resettable fuse: This type of fuse heats up and increases resistance when overcurrent occurs, thereby limiting the current. Once the overcurrent condition disappears, the fuse cools down and returns to a low resistance state. 3. Circuit breaker: When overcurrent is detected, the circuit breaker will open the circuit and cut off the current.

[0005] The above-mentioned current limiting protection methods all cut off the current after reaching a certain current threshold state to prevent overcurrent. Current limiting protection cannot be performed in advance before overcurrent occurs, and the effect of current limiting protection is relatively poor. Summary of the Invention

[0006] The purpose of the present invention is to provide a current limiting protection device and method for a digital power supply, so as to solve the problem that existing current limiting protection methods all cut off the current after reaching a certain current threshold state, cannot perform current limiting protection in advance before overcurrent occurs, and the current limiting protection effect is relatively poor.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: 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; The input end of the current acquisition module is electrically connected to the output end of the digital power supply, and 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 end of the current limiting control module is electrically connected to the output end of the digital power supply, the output end of the current limiting control module is used to connect to the load, the controlled end of the current limiting control module is electrically connected to the control output end of the processor, and the response end of the current limiting control module is electrically connected to the current limiting signal generating end of the current acquisition module; 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 a preset overcurrent value, wherein the first current limiting signal is configured 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 a preset current limiting condition. The second current limiting signal is used to enable the current limiting control module to cut off the real-time output current of the digital power supply.

[0008] Preferably, the current acquisition module includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor, and a second transistor; The first end of the first resistor and the first end of the third resistor are used as input ends of the current acquisition module and are electrically connected to the positive electrode 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. 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; a common end formed by the second end of the third resistor, the emitter of the first transistor and the first end of the fourth resistor serves as a current limiting signal output end to send a first current limiting signal to the current limiting control module; and a common end of the first resistor and the second resistor serves as a current output end to be electrically connected to a current receiving end of the processor; 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; The second end of the fifth resistor and the second end of the second resistor are both grounded.

[0009] 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; The signal detection terminal of the control chip is respectively connected to the first end of the first capacitor and the positive electrode of the first diode, and the negative electrode of the first diode serves 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 is electrically connected to the first end of the seventh resistor, the second end of the seventh resistor is electrically connected to the first end of the sixth resistor and the base of the third transistor respectively, and the collector of the third transistor is electrically connected to the base of the fourth transistor; The second end of the sixth resistor, the emitter of the third transistor and the collector of the fourth transistor are all electrically connected to the positive electrode of the digital power supply; The ground terminal of the control chip and the second terminal of the first capacitor are both grounded.

[0010] Preferably, 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, a tenth resistor and an eleventh resistor; The emitter of the sixth transistor and the first end of the tenth resistor are both electrically connected to the positive electrode 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, and the collector of the sixth transistor is electrically connected to the power supply terminal of the control chip; The second end of the eleventh resistor is grounded, and the common end 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 end of the current limiting control module and is electrically connected to the first control output end of the processor.

[0011] Preferably, the current limiting control module includes: a fifth transistor and a ninth resistor, the collector of the fifth transistor is electrically connected to the signal detection end of the control chip, the base of the fifth transistor is electrically connected to the first end of the ninth resistor, the second end of the ninth resistor is electrically connected to the second control output end of the processor, and the emitter of the fifth transistor is grounded.

[0012] In a second aspect, the present invention provides a current limiting protection method for a digital power supply. The method is implemented based on a processor of the current limiting protection device of the digital power supply described above, and the method includes: Get 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 condition; If so, a second current limiting signal is generated, where the second current limiting signal is used to enable the current limiting control module to cut off the real-time output current of the digital power supply.

[0013] Preferably, determining whether the real-time output current of the digital power supply meets a preset current limiting condition includes: Establishing current levels based on overcurrent preset values, each current level corresponds to a current range, each current level is preset with a corresponding transient change threshold, and each current level is preset with the corresponding transient change threshold as a preset current limiting condition; When the real-time output current of the digital power supply is less than the overcurrent preset value, calculating the transient change rate of the real-time output current of the digital power supply; Determine the current level to which the real-time output current of the digital power supply belongs and the transient change threshold value corresponding to the current level; Determine whether the transient change rate of the real-time output current of the digital power supply exceeds the transient change threshold corresponding to the current level. If so, it indicates that the real-time output current of the digital power supply meets the preset current limiting condition; if not, it indicates that the real-time output current of the digital power supply does not meet the preset current limiting condition.

[0014] Preferably, the method further comprises: Determine whether the real-time output current of the digital power supply has a sudden change; If so, the moment of the mutation is recorded, and an output restart pulse is generated based on the moment of the mutation and the preset recovery time. The output restart pulse is used to cut off the input power of the current limiting control module to restart the current limiting control module.

[0015] Preferably, the method further comprises: Based on the moment of mutation and the output current before the mutation, a current sequence is constructed; Determine whether the current sequence meets the preset warning conditions, and if so, generate warning information; Provide visual warning based on warning information.

[0016] Preferably, the preset warning condition at least includes: within a preset time period, the number of output currents with sudden changes in the current sequence exceeds a preset number or the interval between every two adjacent output currents with sudden changes in the current sequence gradually shortens.

[0017] Beneficial effects: The circuit protection device of the present application is mainly composed of a processor, a current acquisition module, and a current limiting control module. The current limiting control module adopts a threshold method to perform current limiting protection. At the same time, the processor can analyze the real-time output current of the digital power supply collected 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 digital power supply is protected in advance by current limiting, thereby improving the flexibility and current limiting effect of the current limiting protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the embodiments of the present invention, but do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings: Figure 1 This is a block diagram of a current limiting protection device for a digital power supply provided by one embodiment of the present invention; Figure 2 This is a schematic diagram of a current limiting protection device for a digital power supply provided by one embodiment of the present invention; Figure 3 The present invention is a flowchart of a current limiting protection method for a digital power supply provided by an embodiment of the present invention.

[0019] Description of reference numerals: 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 DESCRIPTION

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly introduced below in conjunction with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the 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 work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0021] Example 1 Figure 1 FIG. 1 is a block diagram of a current limiting protection device for a digital power supply provided by an embodiment of the present invention. Figure 1 As shown, this embodiment 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; in this embodiment, the processor may be a digital signal processor (DSP) or a microcontroller (MCU), such as an STM32 series single-chip microcomputer; wherein the input end of the current acquisition module is electrically connected to the output end of the digital power supply, the input end of the current limiting control module is electrically connected to the output end of the digital power supply, the output end of the current limiting control module is used to connect to a load, the controlled end of the current limiting control module is electrically connected to the control output end of the processor, and the response end of the current limiting control module is electrically connected to the current limiting signal generating end of the current acquisition module.

[0022] Among them, the current acquisition module is used to collect the real-time output current of the digital power supply and upload the collected 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 situation of the digital power supply. When the real-time output current of the digital power supply meets the preset current limiting condition, it means that the output current of the digital power supply is deteriorating, which will cause overcurrent. Therefore, a second current limiting signal is generated. 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 realizing early cutting off of the output current.

[0023] Among them, 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 a preset overcurrent value. The first current limiting signal is used to enable the current limiting control module to cut off the real-time output current of the digital power supply. The current limiting control module of this embodiment 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 requires 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 is impossible to quickly respond to overcurrent caused by short circuit; however, through the threshold current limiting method, it can quickly respond to short-circuit faults to cut off the output of the digital power supply and avoid damage to the digital power supply.

[0024] In this embodiment, the digital power supply has an input voltage of 220V AC and an output voltage of 12V to 36V DC. Therefore, the digital power supply includes components such as a transformer and a rectifier. The transformer is used for step-down processing, and the rectifier is used to rectify the stepped-down AC power into DC power. These components are conventional digital power supply components, and their specific structures are not described in detail in this embodiment.

[0025] As a further optimization of this embodiment, 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 and a second transistor, wherein the first transistor Q1 and the second transistor Q2 are both PNP transistors, and when the emitter voltage of the PNP transistor is greater than the base voltage, the PNP transistor is turned on.

[0026] The first end of the first resistor R1 and the first end of the third resistor R3 are used as input ends of the current acquisition module and are electrically connected to the positive electrode 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. 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, and the common end 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 is used as the current limiting signal output end to send the first current limiting signal to the current limiting control module; the common end of the first resistor R1 and the second resistor R2 is used as the current output end, which is electrically connected to the current receiving end of the processor, that is, the attached Figure 2 Isa port in; 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; The second end of the fifth resistor R5 and the second end of the second resistor R2 are both grounded.

[0027] In this embodiment, 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 common ground of the device is not connected to the surrounding Figure 2 . After the load is connected, the generated current flows through the second resistor R2, generating a voltage drop across the first end 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 operating normally, the current of the device is normal. At this time, the potential voltage generated at the first end of the second resistor R2 is lower than the conduction voltage of the second transistor, and the second transistor Q2 is in the off state.

[0028] When the load current increases until it reaches overcurrent, the current in the loop formed by the first resistor R1 and the second resistor R2 will also increase, and the potential voltage of the first end of the second resistor R2 will increase. When overcurrent occurs, the potential voltage generated by the first end of the second resistor R2 can turn on the second transistor Q2. After the second transistor Q2 is turned on, a voltage difference is generated between the potential of the first end and the potential of the second end of the fourth resistor R4. This voltage difference can turn on the first transistor Q1. After the first transistor Q1 is turned on, the emitter of the first transistor Q1 changes from a high potential to a low potential. The potential change of the emitter of the first transistor Q1 can serve as a first current limiting signal.

[0029] As a further optimization of this embodiment, 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 adopt chips such as LM723 and MC1723.

[0030] The signal detection terminal of the control chip U2 is respectively connected to the first end of the first capacitor C1 and the positive electrode of the first diode D1, and the negative electrode of the first diode D1 serves 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 end of the seventh resistor R7, the second end of the seventh resistor R7 is electrically connected to the first end of the sixth resistor R6 and the base of the third transistor Q3, respectively, and the collector of the third transistor Q3 is electrically connected to the base of the fourth transistor Q4; The second end 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 electrode 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.

[0031] In this embodiment, when an overcurrent occurs, after the potential of the emitter of the first transistor Q1 changes from a high level to a low level, when the cathode of the first diode D1 is at a low level, the first diode D1 is turned on, and the signal detection end of the control chip U2 changes from a high level to a low level. After the signal detection end of the control chip U2 detects the low level, the control signal output end of the control chip U2 outputs a high potential (when the signal detection end of the control chip U2 detects the high level, the control signal output end 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 turn-on voltage. At this time, the third transistor Q3 is in a cut-off state, and the collector of the third transistor Q3 is at a low potential. At this time, the base of the fourth transistor Q4 is at a low potential, and the fourth transistor Q4 is in a cut-off state, and the connection between the digital power supply and the load is cut off, thereby providing overcurrent protection.

[0032] As a further optimization of this embodiment, the control output end of the processor includes a first control output end and a second control output end, and the current limiting control module also includes: a sixth transistor Q6, a tenth resistor R10 and an eleventh resistor R11; wherein the sixth transistor Q6 is an NPN transistor.

[0033] The emitter of the sixth transistor Q6 and the first end of the tenth resistor R10 are both electrically connected to the positive electrode 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, and 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, and the common end 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 end of the current limiting control module and is electrically connected to the first control output end of the processor.

[0034] In this embodiment, since the control signal output terminal of the control chip U2 will always maintain a high potential after outputting a high potential, the third transistor Q3 and the fourth transistor Q4 will always remain in the cut-off state and cannot output the 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, 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 is electrically connected to the processor, that is, Figure 2 when there is no signal output from the first control output terminal of the processor, 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 on state, and the power input terminal of the control chip U2 and the positive electrode of the digital power supply are connected.

[0035] After the control signal output terminal of the control chip U2 outputs a high potential, in order to restore the control signal output terminal of the control chip U2 to a low potential, the processor generates a pulse signal, which acts on the Clr2 terminal, so that the potential difference between the emitter and the 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 Example 2) can cause the sixth transistor Q6 to be in an off state for a period of time, severing the connection between the control chip U2 and the digital power supply, and powering off the control chip U2; after the pulse signal ends, the sixth transistor Q6 is turned on again, the control chip U2 is reconnected to the digital power supply, the control chip U2 is powered on again, and initialization is performed, and the control signal output terminal of the control chip U2 returns to a low potential; after the control signal output terminal of the control chip U2 returns to a low potential, the third transistor Q3 and the fourth transistor Q4 are turned on again, and the digital power supply can output power.

[0036] As a further optimization of this embodiment, Figure 2 As shown, the current limiting control module also includes: a fifth transistor Q5 and a ninth resistor R9, the collector of the fifth transistor Q5 is electrically connected to the signal detection end of the control chip U2, the base of the fifth transistor Q5 is electrically connected to the first end of the ninth resistor R9, the second end of the ninth resistor R9 is electrically connected to the second control output end of the processor, and the emitter of the fifth transistor Q7 is grounded.

[0037] In this embodiment, when the real-time output current of the digital power supply meets a preset current-limiting condition, it indicates that the output current of the digital power supply is deteriorating, which may result in overcurrent. Therefore, a second current-limiting signal is generated, and the real-time output current of the digital power supply is cut off using the second current-limiting signal. 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 end of the ninth resistor R9 serves as the Clr1 terminal and is 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 an off state, thereby cutting off the output of the digital power supply and achieving premature cutoff of the output current.

[0038] 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 output filtering and reverse connection protection for the digital power supply.

[0039] Example 2 Figure 3 FIG. 1 is a flow chart of a current limiting protection method for a digital power supply provided by an 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 a processor of the current limiting protection device for a digital power supply in the first embodiment. The method includes: Step S10: Obtain the real-time output current of the digital power supply. In this embodiment, the voltage at the Isa terminal is collected. The voltage at the Isa terminal is the voltage of the second resistor R2. After the voltage at the Isa terminal is collected, the real-time output current of the corresponding 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.

[0040] Step S20: determining whether the real-time output current of the digital power supply satisfies a preset current limiting condition.

[0041] Step S30: If yes, generate a second current limiting signal, where the second current limiting signal is used to enable the current limiting control module to cut off the real-time output current of the digital power supply.

[0042] In this embodiment, the working principle of enabling the current limiting control module to cut off the real-time output current of the digital power supply according to the second current limiting signal has been described in detail in the first embodiment.

[0043] 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: Step a10: Establishing current levels based on preset overcurrent values. Each current level corresponds to a current range, and each current level is preset with a corresponding transient change threshold. The preset transient change threshold for each current level serves as a preset current limiting condition. In this embodiment, during the use of the digital power supply, although the load does not experience overcurrent, frequent and large transient current changes in the circuit indicate the presence of potential circuit faults. For example, power supply voltage fluctuations or transient voltage changes may cause a transient increase in current, capacitor or inductor failure, circuit aging, and rapid switching of electrical loads. These potential faults may prevent the normal operation of the digital power supply. Different current levels correspond to different change thresholds. For example, when the current is low, a sudden large transient change indicates a hidden circuit fault.

[0044] Step a20: When the real-time output current of the digital power supply is less than the preset overcurrent value, calculate the transient change rate of the real-time output current of the digital power supply.

[0045] Step a30: Determine the current level to which the real-time output current of the digital power supply belongs and the transient change threshold corresponding to the current level.

[0046] Step a40: Determine whether the transient change rate of the real-time output current of the digital power supply exceeds the transient change threshold corresponding to the current level. If so, it indicates that the real-time output current of the digital power supply meets the preset current limiting condition; if not, it indicates that the real-time output current of the digital power supply does not meet the preset current limiting condition.

[0047] Therefore, this embodiment implements 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 operation of the digital power supply.

[0048] As a further optimization of this embodiment, the method further includes: Step b10: Determine whether the real-time output current of the digital power supply has a sudden change.

[0049] Step b20: If yes, record the moment of the mutation, and generate an output restart pulse based on the moment of the mutation and the preset recovery time. The output restart pulse is used to cut off the input power of the current limiting control module to restart the current limiting control module.

[0050] In this embodiment, the restart steps of the current limiting control module have been specifically described in Example 1. During the restart process, assuming that the load overcurrent fault 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 of Example 1 also integrates a communication module, which uses the communication module to send the overcurrent alarm to the corresponding management personnel for remote alarm. Secondly, the alarm can also be locally generated, generating an audible and visual alarm signal to alert staff.

[0051] As a further optimization of this embodiment, the method further includes: Step c10: construct a current sequence based on the moment of the mutation and the output current before the mutation.

[0052] Step c20: Determine whether the current sequence meets the preset warning conditions. If so, generate warning information; wherein the preset warning conditions at least include: within a preset time length, the number of output currents with mutations in the current sequence exceeds a preset number or the interval length corresponding to each two adjacent output currents with mutations in the current sequence gradually shortens.

[0053] In this embodiment, each mutation indicates that the output of the digital power supply has been cut off once. Overcurrent or a potential circuit fault may have occurred, resulting in an instantaneous change in current. As the number of mutations increases, the health status of the circuit can be inferred. If a preset alarm condition exists, it means that the health status of the circuit is gradually deteriorating, and a timely warning is required to inform the management personnel to maintain and repair the circuit to avoid the development of a safety accident, thereby further improving the safety and reliability of the power supply operation.

[0054] Step c30: Perform visual warning based on the warning information. In this embodiment, the warning information can be used for local warning or remote warning.

[0055] The present invention analyzes the real-time output current of the digital power supply collected by the current collection module to determine whether the real-time output current of the digital power supply meets the preset current limiting condition. When the preset current limiting condition is met, the present invention implements early current limiting protection for the digital power supply, thereby improving the flexibility and current limiting effect of the current limiting protection.

[0056] Example 3 This embodiment further 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, the current limiting protection method for a digital power supply in the second embodiment is implemented.

[0057] This embodiment further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the current limiting protection method for a digital power supply in the second embodiment is implemented.

[0058] The present invention analyzes the real-time output current of the digital power supply collected by the current collection module to determine whether the real-time output current of the digital power supply meets the preset current limiting condition. When the preset current limiting condition is met, the present invention implements early current limiting protection for the digital power supply, thereby improving the flexibility and current limiting effect of the current limiting protection.

[0059] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0060] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0061] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present 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 end of the current acquisition module is electrically connected to the output end of the digital power supply, and 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 end of the current limiting control module is electrically connected to the output end of the digital power supply, the output end of the current limiting control module is used to connect to the load, the controlled end of the current limiting control module is electrically connected to the control output end of the processor, and the response end of the current limiting control module is electrically connected to the current limiting signal generating end of the current acquisition module; 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 a preset overcurrent value, wherein the first current limiting signal is configured 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 a preset current limiting condition. The second current limiting signal is used to enable the current limiting control module to cut off the real-time output current of the digital power supply.

2. The current limiting protection device for a digital power supply according to claim 1, characterized in that: The current acquisition module comprises: 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 input ends of the current acquisition module and are electrically connected to the positive electrode 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; The second end of the third resistor (R3) is electrically connected to the emitter of the first triode (Q1) and the first end of the fourth resistor (R4), respectively; a common end formed by the second end of the third resistor (R3), the emitter of the first triode (Q1) and the first end of the fourth resistor (R4) is used as a current limiting signal output end to send the first current limiting signal to the current limiting control module; and a common end of the first resistor (R1) and the second resistor (R2) is used as a current output end and electrically connected to a current receiving end 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) 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; The second end of the fifth resistor (R5) and the second end of the second resistor (R2) are both grounded.

3. The current limiting protection device for a digital power supply according to claim 1, wherein: The current limiting control module comprises: 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 end of the control chip (U2) is respectively connected to the first end of the first capacitor (C1) and the positive electrode of the first diode (D1), and the negative electrode of the first diode (D1) serves as the response end of the current limiting control module and is electrically connected to the current limiting signal output end of the current acquisition module; The control signal output end of the control chip (U2) is electrically connected to the first end of the seventh resistor (R7), the second end of the seventh resistor (R7) is electrically connected to the first end 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 end 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 electrode of the digital power supply; The grounding terminal of the control chip (U2) and the second terminal of the first capacitor (C1) are both grounded.

4. The current limiting protection device for a digital power supply according to claim 3, characterized in that: The control output end of the processor includes a first control output end and a second control output end, 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 end of the tenth resistor (R10) are both electrically connected to the positive electrode 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, and 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, and a common end 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 a controlled end of the current limiting control module and is electrically connected to the first control output end of the processor.

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

6. A current limiting protection method for a digital power supply, the method being implemented based on a processor of the current limiting protection device for a digital power supply according to any one of claims 1 to 5, characterized in that: The method comprises: Get 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 condition; If so, a second current limiting signal is generated, where the second current limiting signal is used to enable the current limiting control module to cut off the real-time output current of the digital power supply.

7. The current limiting protection method for a digital power supply according to claim 6, characterized in that: Determine whether the real-time output current of the digital power supply meets the preset current limiting conditions, including: Establishing current levels based on overcurrent preset values, each current level corresponds to a current range, each current level is preset with a corresponding transient change threshold, and each current level is preset with the corresponding transient change threshold as a preset current limiting condition; When the real-time output current of the digital power supply is less than the overcurrent preset value, calculating the transient change rate of the real-time output current of the digital power supply; Determine the current level to which the real-time output current of the digital power supply belongs and the transient change threshold value corresponding to the current level; Determine whether the transient change rate of the real-time output current of the digital power supply exceeds the transient change threshold corresponding to the current level. If so, it indicates that the real-time output current of the digital power supply meets the preset current limiting condition; if not, it indicates that the real-time output current of the digital power supply does not meet the preset current limiting condition.

8. The current limiting protection method for a digital power supply according to claim 6 or 7, characterized in that: The method further comprises: Determine whether the real-time output current of the digital power supply has a sudden change; If so, the moment of the mutation is recorded, and an output restart pulse is generated based on the moment of the mutation and the preset recovery time. The output restart pulse is used to cut off the input power of the current limiting control module to restart the current limiting control module.

9. The current limiting protection method for a digital power supply according to claim 8, characterized in that: The method further comprises: Based on the moment of mutation and the output current before the mutation, a current sequence is constructed; Determine whether the current sequence meets the preset warning conditions, and if so, generate warning information; Provide visual warning based on warning information.

10. The current limiting protection method for a digital power supply according to claim 9, characterized in that: The preset warning condition includes at least: within a preset time period, the number of output currents with mutations in the current sequence exceeds a preset number or the interval between each two adjacent output currents with mutations in the current sequence gradually shortens.

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