CN113471931B - Power supply loop protection device and method - Google Patents
Power supply loop protection device and method Download PDFInfo
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- CN113471931B CN113471931B CN202110720741.7A CN202110720741A CN113471931B CN 113471931 B CN113471931 B CN 113471931B CN 202110720741 A CN202110720741 A CN 202110720741A CN 113471931 B CN113471931 B CN 113471931B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000012545 processing Methods 0.000 claims description 25
- 238000004891 communication Methods 0.000 claims description 12
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- 238000010586 diagram Methods 0.000 description 4
- 238000012856 packing Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
Abstract
The invention provides a power supply loop protection device and a method, wherein the device comprises: comprising a fuse and a protection unit arranged in the power supply loop; the protection unit is connected in series with the fuse and is used for collecting real-time current signals in the power supply loop and performing overcurrent protection on the power supply loop based on the real-time current signals; the specification parameters of the fuse are determined based on real-time current signals collected by the protection unit. The power circuit protection device and the method provided by the invention can be used for rapidly and effectively cutting off the power circuit according to the real-time current signal, and providing the protection of the fuse when the protection unit fails.
Description
Technical Field
The invention relates to the technical field of mechanical engineering, in particular to a power supply loop protection device and method.
Background
In the working machine, for a high-power supply loop, the device is damaged due to the occurrence of short circuit in a load electrical appliance, and adverse effects are caused. In the prior art, protection is usually performed by using a fused fuse, and the fuse specification is basically selected according to experience or a trial and error mode in the method, so that the fuse specification is often larger. Therefore, the fuse cannot be melted in time, the power supply loop cannot be effectively protected, and meanwhile, the cost of the electric device is increased.
Disclosure of Invention
The invention provides a power circuit protection device and a method, which are used for solving the technical problem of poor protection effect of a power circuit in the prior art.
The invention provides a power circuit protection device, which comprises a fuse and a protection unit, wherein the fuse and the protection unit are arranged in a power circuit;
and the protection unit is connected in series with the fuse and is used for collecting real-time current signals in the power supply loop and carrying out overcurrent protection on the power supply loop based on the real-time current signals.
According to the power supply loop protection device provided by the invention, the specification parameters of the fuse are determined based on the real-time current signals collected by the protection unit.
According to the power supply loop protection device provided by the invention, the protection unit comprises an acquisition module, a processing module and a circuit breaking module which are electrically connected in sequence;
the acquisition module is used for acquiring real-time current signals in the power supply loop;
the processing module is used for comparing the real-time current signal with a preset current threshold value, and determining a line protection instruction if the real-time current signal is greater than or equal to the preset current threshold value;
and the circuit breaking module is used for breaking the power supply loop based on the line protection instruction.
According to the power supply loop protection device provided by the invention, the processing module is further used for:
determining a line reset instruction; the line reset instruction is used to close the power supply loop.
According to the power supply loop protection device provided by the invention, the protection unit further comprises a communication module;
the communication module is electrically connected with the processing module and is used for sending the real-time current signal to a remote control device so that the remote control device can display the real-time current signal.
According to the power supply loop protection device provided by the invention, the acquisition module is a current sensor with multiple redundant settings.
According to the power supply loop protection device provided by the invention, the preset current threshold value is determined based on the load in the power supply loop.
According to the power circuit protection device provided by the invention, the fuse comprises at least one of a porcelain plug type, a spiral type, a closed pipe type and a packing type.
The invention provides a power supply loop protection method, which is applied to a power supply loop protection device and comprises the following steps:
acquiring a real-time current signal in a power supply loop;
performing overcurrent protection on the power supply loop based on the real-time current signal and a preset current threshold value, and determining specification parameters of a fuse in the power supply loop based on the real-time current signal;
the fuse and the power circuit protection device are connected in series in the power circuit.
According to the power supply loop protection method provided by the invention, the power supply loop is over-current protected based on the real-time current signal and a preset current threshold value, and the method comprises the following steps:
and if the real-time current signal is greater than or equal to a preset current threshold value, the power supply loop is disconnected.
According to the power circuit protection method provided by the invention, the method for acquiring the real-time current signal in the power circuit comprises the following steps:
acquiring rated power of a load in a power supply loop;
determining an operating current of the power supply loop based on an operating voltage of the power supply loop and a rated power of the load;
and determining the preset current threshold based on the working current.
According to the power circuit protection device and the power circuit protection method, the fuse and the protection unit which are connected in series are arranged in the power circuit, so that real-time current signals in the power circuit can be collected, the power circuit can be rapidly and effectively cut off according to the real-time current signals, and fuse protection can be provided when the protection unit fails.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a power circuit protection device according to the present invention;
fig. 2 is a schematic structural diagram of an intelligent circuit protection device provided by the present invention;
fig. 3 is a schematic flow chart of a power circuit protection method provided by the invention.
Reference numerals:
100: a power supply loop protection device; 110: a fuse;
120: a protection unit; 121: an acquisition module;
122: a processing module; 123: a circuit breaking module;
124: and a communication module.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic structural diagram of a power circuit protection device according to the present invention, and as shown in fig. 1, a power circuit protection device 100 includes a fuse 110 and a protection unit 120 disposed in a power circuit;
the protection unit 120 is connected in series with the fuse 110 and is used for collecting a real-time current signal in the power circuit and performing overcurrent protection on the power circuit based on the real-time current signal;
the specification parameters of the fuse 110 are determined based on the real-time current signals collected by the protection unit 120.
Specifically, the electrical structure of the work machine includes a plurality of power supply circuits. When the working machine is working, the current of each power supply loop also changes at the moment along with the change of working conditions. If the power supply loop is not monitored, the excessive current will cause damage to components in the power supply loop, resulting in huge economic loss. The power circuit protection device 100 provided in the embodiment of the present invention may be disposed in each power circuit, and is composed of a fuse 110 and a protection unit 120. The fuse 110 and the protection unit 120 are connected in series and then connected into a power circuit.
The fuse 110 is an electric element that fuses a melt by heat generated by itself when a current in a power supply circuit exceeds a predetermined value, and opens the power supply circuit.
The protection unit 120 is an actuator having a current detection and circuit breaking function. When the power circuit is connected to the load for operation, the protection unit 120 is configured to collect a real-time current signal in the power circuit, and determine according to the real-time current signal. If the real-time current signal exceeds a predetermined value, the protection unit 120 cuts off the power supply loop, so as to prevent the excessive current from damaging various electrical elements in the circuit. If the real-time current signal is lower than a predetermined value, the protection unit 120 keeps the power circuit connected, so that each electrical element in the circuit works normally.
The real-time current signal collected by the protection unit 120 may be counted to obtain a current value of the power supply loop connected to the load under the full working condition of the working machine. The current values are analyzed to obtain the maximum value of the current of the power supply loop. From this current maximum value, a specification parameter of the fuse 110 can be determined.
The specification parameters include rated current, limit split current value, and the like. The rated current of the fuse 110 is the value of current that the fuse 110 can pass through for a long period of time and operates normally, and is dependent on the allowable temperature rise of the fuse parts during long-term operation. The limit breaking current value refers to the maximum short-circuit current that the fuse 110 can reliably break under the fault condition, and is an important technical index parameter of the fuse 110.
For example, the loop normal operation current 13A, the specification of the preliminary selected fuse 110 is 32A, the preset current of the power loop protection device 100The threshold value is set to be equal to the rated current of the fuse 110 for the first time, and the maximum current value I of the loop under the full working condition of normal running of the vehicle for a plurality of times is collected through the collecting module 110 of the power loop protection device 100 max Then according to I max The value of (1) selects the rated current of the fuse 110.
In the prior art, a single fuse is generally used to protect the power supply circuit. Because the specification parameters of the fuse are determined according to manual experience or after multiple trial and error, the accuracy is low, the fuse cannot be timely fused, and a power supply loop cannot be protected. In addition, the power supply loop is protected according to real-time current alone, and when the current detection device or the power supply switching device fails, the power supply loop cannot be effectively protected. The embodiment of the invention combines the fuse 110 and the protection unit 120, can timely protect the power circuit before the fuse 110 is not fused, and can also protect the power circuit from overcurrent when the protection unit 120 fails. The specification parameters of the fuse 110 may also be determined according to the real-time current signal collected by the protection unit 120.
According to the power circuit protection device provided by the embodiment of the invention, the fuse and the protection unit are arranged in series in the power circuit, so that the real-time current signal in the power circuit can be collected, the power circuit can be rapidly and effectively cut off according to the real-time current signal, and the fuse protection can be provided when the protection unit fails.
Based on the above embodiment, the protection unit 120 includes an acquisition module 121, a processing module 122, and a breaking module 123 electrically connected in sequence;
the acquisition module 121 is used for acquiring real-time current signals in the power supply loop;
the processing module 122 is configured to compare the real-time current signal with a preset current threshold, and determine a line protection instruction if the real-time current signal is greater than or equal to the preset current threshold;
and a circuit breaking module 123 for breaking the power supply circuit based on the line protection instruction.
Specifically, the protection unit 120 includes an acquisition module 121, a processing module 122, and a circuit breaking module 123, which are electrically connected in sequence.
The acquisition module 121 may be a current sensor for acquiring real-time current signals in the power supply loop. The current sensor may be of the type of a shunt, an electromagnetic current transformer, an electronic current transformer, etc.
The processing module 122 is configured to process the real-time current signal. A preset current threshold may be set in the memory of the processing module 122 for measuring the magnitude of the real-time current signal. The preset current threshold may be selected as the maximum current that the power supply loop can withstand. If the real-time current signal is greater than or equal to the preset current threshold, it indicates that the real-time current in the power circuit exceeds the current range that can be borne by the power circuit, and damage will be caused to the electrical components in the power circuit, at this time, the processing module 122 may generate a line protection command and send the line protection command to the circuit breaking module 123.
The breaking module 123 is used for opening or closing the power circuit. When the circuit breaking module 123 receives the line protection instruction, the power supply loop is immediately disconnected, and the current is cut off.
Based on any of the above embodiments, the processing module 122 is further configured to:
determining a line reset instruction; the line reset command is used to close the power supply loop.
Specifically, in addition to over-current protection of the power supply loop, the processing module 122 may determine a line reset instruction for resetting the power supply loop.
For example, the processing module 122 may determine the line reset instruction based on a preset time constant. The preset time constant can be 10 seconds and 1 minute, and can be set according to actual needs. The processing module 122 may generate a line reset command to send to the circuit breaking module 123 after the duration of the power circuit disconnection exceeds a preset time constant. When the circuit breaking module 123 receives the line reset instruction, the power supply loop is turned on immediately.
If the real-time current signal in the power circuit after being turned on is still greater than or equal to the preset current threshold, the abnormal situation in the power circuit is indicated not to be eliminated, and the power circuit cannot normally work at the moment, the processor 122 generates a line protection instruction according to the real-time current signal acquired again by the acquisition module 121, and the circuit breaking module 123 continues to break the power circuit; if the real-time current signal in the power circuit after being connected is smaller than the preset current threshold value, the abnormal situation in the power circuit is eliminated, and normal work can be continued at the moment.
Based on any of the above embodiments, the protection unit 120 further includes a communication module 124;
the communication module 124 is electrically connected to the processing module 122, and is configured to send the real-time current signal to the remote control device, so that the remote control device displays the real-time current signal.
Specifically, the remote control device may be an upper level controller, or a remote server, or the like. For example, the remote control device may be a vehicle control in the work machine. The communication module 124 may send the real-time current signal provided by the processing module 122 to the vehicle controller at regular time intervals. The vehicle control displays the real-time current signal on a control panel of the work machine for reference by the driver.
The communication module 124 may be connected to a remote control device through a wired device or a wireless device. For example, the wired device may be a communication bus on the work machine and the wireless device may be an internet of vehicles wireless communication device on the work machine.
Based on any of the above embodiments, the acquisition module 121 is a multiple redundancy set of current sensors.
Specifically, to improve accuracy of current collection, the collection module 121 may be a multiple redundant set of current sensors. For example, for an important power supply loop, the acquisition module 121 may be provided with 3 redundant current sensors, and the types and the precision of the current sensors may also be set to be different, so as to improve the reliability and the precision of real-time current signal acquisition. For a common power supply loop, the acquisition module 121 may be provided with 1 current sensor.
Based on any of the embodiments described above, the preset current threshold is determined based on a load in the power supply loop.
In particular, the load carried by portions of the power circuit of the work machine may vary. The preset current threshold in the power loop protection device 100 should be different for different loads to effectively protect the power loop.
Thus, the preset current threshold may be determined according to the load in the power supply loop. The preset current threshold may be directly proportional to the power level of the load. For larger loads, a larger preset current threshold may be set, and for smaller loads, a smaller preset current threshold may be set.
Based on any of the embodiments described above, the fuse 110 includes at least one of a porcelain insert, a screw, a closed tube, and a filler.
Specifically, the specific type of the fuse 110 may be selected according to the actual situation.
The porcelain plug-in type fuse consists of five parts, namely a porcelain cover, a porcelain base, a movable contact, a fixed contact and a fuse wire, is convenient to replace and is widely applied to the open-circuit protection of illumination and small-capacity motors. The spiral fuse mainly comprises a porcelain cap, a fuse tube, a porcelain sleeve, an upper wiring terminal, a lower wiring terminal, a seat and the like. The sealed tube fuse consists of one fuse tube, two sockets and one or two fuse pieces. The fuse piece of the fuse is arranged in the fuse tube and is contacted with the socket through the cap of the fuse tube to form a current path. The packing type fuse mainly comprises a tube body, an indicator, quartz sand packing and a melt.
Based on any of the above embodiments, fig. 2 is a schematic structural diagram of the intelligent line protection device provided by the present invention, and as shown in fig. 2, the intelligent line protection device includes a fuse (FU 1) and an intelligent fuse. The intelligent fuse is connected in series behind the fuse. The intelligent fuse includes: the device comprises 1 current collector, 1 processing unit, 1 register, 1 cut-off device, 1 low voltage interface and 1 communication interface.
The working process of the intelligent line protection device comprises the following steps:
the current collector continuously collects loop current and transmits a current signal to the processing unit;
the processing unit converts the electric signal into a required level signal and registers the level signal into the storage;
the register sends the electric signals to the controller at regular intervals, and the controller processes the electric signals and sends the electric signals to the whole vehicle controller;
the whole vehicle controller sends signals to an instrument for display monitoring;
the intelligent fuse acquires the current true value required by the protection loop load under the full working condition of the vehicle;
and optimizing the type selection of the fuse according to the acquisition result.
For example, when the load is an inflating pump, the rated power is 4kW, the working voltage is 320V, the normal working current of the loop is 13A, the specification of initially selected FU1 is 32A, the threshold value of the intelligent fuse is equal to FU1 for the first time, and the whole vehicle controller collects the maximum current value I of the loop under the full working condition of normal running of the vehicle for a plurality of times through the control module of the intelligent fuse max Then according to I max Is selected from the specification of FU 1.
For another example, when the load is an inflating pump, the rated power is 4kW, the working voltage is 320V, the normal working current of the loop is 13A, the specification of the initially selected FU1 is 32A, and the threshold value of the intelligent fuse is set to be the value FU for the first time K The monitoring module of the intelligent fuse acquires the current value I of the loop under the condition that the vehicle runs for a plurality of times, and when the current value I is not less than FU1 K And when the intelligent fuse cuts off the protection loop.
Based on any of the above embodiments, fig. 3 is a schematic flow chart of a power circuit protection method provided by the present invention, and as shown in fig. 3, the method is applied to the above power circuit protection device, and includes:
step 310, acquiring a real-time current signal in a power supply loop;
step 320, performing overcurrent protection on the power supply loop based on the real-time current signal and a preset current threshold, and determining specification parameters of the fuse in the power supply loop based on the real-time current signal;
the fuse and the power circuit protection device are connected in series in the power circuit.
Specifically, the real-time current signal may be acquired by an acquisition module in the power loop protection device. The acquisition module can also carry out filtering processing on the real-time current signal so as to eliminate noise in the real-time current signal and improve the accuracy of current data acquisition.
For important power supply loops, the reliability of the real-time current signals can also be improved by a redundant acquisition method. For example, 3 redundant current sensors may be simultaneously provided to collect 3 real-time current signals, respectively, and then a three-by-two logic is used to determine the final output real-time current signal. For example, a plurality of current sensors of different types can be further arranged to respectively collect real-time current in the same power supply loop, so that the reliability and the accuracy of real-time current signal collection are improved.
A preset current threshold may be set for measuring the magnitude of the real-time current signal. The preset current threshold may be selected as the maximum current that the power supply loop can withstand. If the real-time current signal is greater than or equal to the preset current threshold, the real-time current in the power circuit exceeds the current range which can be born by the power circuit, and the electric elements in the power circuit are damaged, and at the moment, a line protection instruction can be generated to carry out overcurrent protection on the power circuit.
The line reset instruction may be determined according to a preset time constant. The preset time constant can be 10 seconds and 1 minute, and can be set according to actual needs. The line reset command may be generated for switching on the power circuit after the duration of the power circuit off exceeds a preset time constant.
If the real-time current signal in the power circuit after being connected is still larger than the preset current threshold value, the abnormal situation in the power circuit is indicated not to be eliminated, at the moment, the power circuit cannot work normally, the real-time current signal is collected again, a line protection instruction is generated, and the power circuit is disconnected; if the real-time current signal in the power circuit after being connected is smaller than the preset current threshold value, the abnormal situation in the power circuit is eliminated, and normal work can be continued at the moment.
The real-time current signals can be counted to obtain the current value of the power supply loop connected to the load of the working machine under the full working condition. The current values are analyzed to obtain the maximum value of the current of the power supply loop. From this current maximum, the specification parameters of the fuse can be determined.
According to the power circuit protection method provided by the embodiment of the invention, the fuse and the protection unit are arranged in series in the power circuit, so that the real-time current signal in the power circuit can be collected, the power circuit can be rapidly and effectively cut off according to the real-time current signal, the fuse protection can be provided when the protection unit fails, and the specification parameters of the fuse can be determined according to the real-time current signal collected by the protection unit due to double protection of the power circuit, the complementary advantages of the fuse and the protection unit are realized, and the reliability of the protection of the power circuit is improved.
Based on any of the above embodiments, step 320 includes:
if the real-time current signal is greater than or equal to the preset current threshold value, the power supply loop is disconnected.
Specifically, if the real-time current signal is greater than or equal to the preset current threshold, it indicates that the real-time current in the power circuit exceeds the current range that can be born by the power circuit, and the damage to the electrical elements in the power circuit is caused, and at this time, the power circuit is disconnected to perform overcurrent protection on the power circuit.
Based on any of the above embodiments, step 310 may be preceded by:
acquiring rated power of a load in a power supply loop;
determining an operating current of the power supply loop based on an operating voltage of the power supply loop and a rated power of the load;
based on the operating current, a preset current threshold is determined.
Specifically, when a load is connected in the power supply loop, the rated power of the load can be obtained according to the parameter information of the load. And determining the working current of the power supply loop according to the working voltage and rated power of the power supply loop. And taking the product of the working current and the margin coefficient as a preset current threshold value.
The margin coefficient can be 1, 1.05, 1.1 and the like, and can be selected according to actual conditions.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several commands for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A power supply circuit protection device, characterized by comprising a fuse and a protection unit arranged in the power supply circuit;
the protection unit is connected in series with the fuse and is used for collecting real-time current signals in the power supply loop and performing overcurrent protection on the power supply loop based on the real-time current signals;
the protection unit comprises an acquisition module, a processing module and a circuit breaking module which are electrically connected in sequence;
the acquisition module is used for acquiring real-time current signals in the power supply loop;
the processing module is used for comparing the real-time current signal with a preset current threshold value, and determining a line protection instruction if the real-time current signal is greater than or equal to the preset current threshold value;
the circuit breaking module is used for breaking the power supply loop based on the line protection instruction;
the protection unit further comprises a communication module;
the communication module is electrically connected with the processing module and is used for sending the real-time current signal to a remote control device so as to enable the remote control device to display the real-time current signal;
the remote control device is a whole vehicle controller in the operation machinery; the whole vehicle controller is used for displaying the real-time current signal on a control panel of the working machine.
2. The power supply circuit protection device of claim 1, wherein the specification parameters of the fuse are determined based on real-time current signals collected by the protection unit.
3. The power supply loop protection device of claim 1, wherein the processing module is further configured to:
determining a line reset instruction; the line reset instruction is used to close the power supply loop.
4. The power circuit protection device of claim 1, wherein the acquisition module is a multiple redundant set of current sensors.
5. The power circuit protection device of claim 1, wherein the preset current threshold is determined based on a load in the power circuit.
6. A power supply circuit protection method, characterized by being applied to the power supply circuit protection device as claimed in any one of claims 1 to 5, comprising:
acquiring a real-time current signal in a power supply loop;
performing overcurrent protection on the power supply loop based on the real-time current signal and a preset current threshold value, and determining specification parameters of a fuse in the power supply loop based on the real-time current signal;
the fuse and the power circuit protection device are connected in series in the power circuit.
7. The power circuit protection method according to claim 6, wherein the over-current protection of the power circuit based on the real-time current signal and a preset current threshold value comprises:
and if the real-time current signal is greater than or equal to a preset current threshold value, the power supply loop is disconnected.
8. The method of claim 6, wherein said acquiring the real-time current signal in the power circuit, previously comprises:
acquiring rated power of a load in a power supply loop;
determining an operating current of the power supply loop based on an operating voltage of the power supply loop and a rated power of the load;
and determining the preset current threshold based on the working current.
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| CN113471931A (en) | 2021-10-01 |
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