CN117498268B - Overcurrent protection circuit and control method thereof - Google Patents
Overcurrent protection circuit and control method thereof Download PDFInfo
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- CN117498268B CN117498268B CN202410002000.9A CN202410002000A CN117498268B CN 117498268 B CN117498268 B CN 117498268B CN 202410002000 A CN202410002000 A CN 202410002000A CN 117498268 B CN117498268 B CN 117498268B
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- 238000007796 conventional method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 230000007257 malfunction 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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Abstract
The application relates to an overcurrent protection circuit and a control method thereof, wherein the method comprises the following steps: simultaneously inputting a first pulse and a second pulse, wherein the first pulse and the second pulse are interlaced pulses; acquiring a preset voltage; comparing the target voltage with a preset voltage, wherein the target voltage is the higher voltage of the first pulse and the second pulse in the target time; when the target voltage is greater than or equal to the preset voltage, determining the pulse causing overcurrent as a first pulse or a second pulse according to the target time corresponding to the target voltage. By setting the first pulse and the second pulse to be staggered, whether the overcurrent phenomenon occurs in the circuit can be known only by comparing the target voltage with the preset voltage in the target time, namely, the first pulse and the second pulse can share the overcurrent protection circuit, the overcurrent protection circuit and the control method thereof do not need to be independently arranged for the first pulse and the second pulse, and the volume of the overcurrent protection circuit is reduced.
Description
Technical Field
The present disclosure relates to the field of overcurrent protection technologies, and in particular, to an overcurrent protection circuit and a control method thereof.
Background
Overcurrent protection is a protection scheme in which a protection device is activated when a current exceeds a predetermined maximum value to prevent the current from damaging a circuit.
In operation of the power system, various malfunctions and abnormal operation conditions may occur, thereby causing the current to exceed a predetermined maximum value. In this case, if the current is not processed, the stability of the operation of the power system may be deteriorated, and therefore, it is necessary to provide an overcurrent protection circuit in the system.
However, the internal structure of the power system is very complex, and the existing overcurrent protection circuit has a large volume and cannot be well configured in the power system.
Disclosure of Invention
Accordingly, it is necessary to provide an overcurrent protection circuit and a control method thereof, which reduce the size of the overcurrent protection circuit.
In one aspect, a control method of an overcurrent protection circuit is provided, the method including the steps of:
simultaneously inputting a first pulse and a second pulse, wherein the first pulse and the second pulse are staggered pulses;
acquiring a target voltage, wherein the target voltage is the higher voltage of the first pulse and the second pulse in a target time;
comparing the target voltage with a preset voltage;
and when the target voltage is larger than the preset voltage, determining the pulse causing overcurrent as the first pulse or the second pulse according to the target time corresponding to the target voltage.
In one embodiment, after comparing the target voltage with the preset voltage, the method includes:
and when the target voltage is smaller than or equal to the preset voltage, determining that no overcurrent event occurs.
In one embodiment, after determining that the pulse causing the overcurrent is the first pulse or the second pulse according to the target time corresponding to the target voltage when the target voltage is greater than or equal to the preset voltage, the method includes:
and starting overcurrent protection.
In one embodiment, the enabling the over-current protection includes:
sending out an alarm signal;
and/or the number of the groups of groups,
the first pulse or the second pulse is turned off.
In one aspect, there is provided an overcurrent protection circuit comprising:
the access port is used for inputting a first pulse and a second pulse, and the first pulse and the second pulse are staggered pulses;
the input end of the comparison module is connected with the access port and is used for comparing a target voltage with a preset voltage, wherein the target voltage is the higher voltage of the first pulse and the second pulse in a target time;
the control module is connected with the access port and the comparison module and is used for controlling the access port to simultaneously input the first pulse and the second pulse, and determining the pulse causing overcurrent as the first pulse or the second pulse according to the target time corresponding to the target voltage when the target voltage is greater than or equal to the preset voltage.
In one embodiment, the over-current protection circuit includes:
and the protection module is connected with the control module and is used for performing overcurrent protection.
In one embodiment, the protection module includes an alarm and/or the protection module includes a circuit breaker.
In one embodiment, the over-current protection circuit includes:
the acquisition module comprises a first acquisition unit and a second acquisition unit, wherein the output end of the first acquisition unit is connected with the output end of the second acquisition unit and is connected with the access port, the input end of the first acquisition unit is used for acquiring the first pulse, and the input end of the second acquisition unit is used for acquiring the second pulse.
In one embodiment, the acquisition module comprises:
the device comprises a first switch and a second switch, wherein two ends of the first switch are respectively connected with the first acquisition unit and the access port, and two ends of the second switch are respectively connected with the second acquisition unit and the access port.
In one embodiment, the first switch includes a first diode, a cathode of the first diode is connected to the access port, an anode of the first diode is connected to the first acquisition unit, the second switch includes a second diode, a cathode of the second diode is connected to the access port, and an anode of the second diode is connected to the second acquisition unit.
According to the overcurrent protection circuit and the control method thereof, the first pulse and the second pulse are mutually staggered, so that one of the first pulse and the second pulse has a higher voltage and the other of the first pulse and the second pulse has a lower voltage in the target time. At this time, whether the overcurrent phenomenon occurs in the circuit can be known only by comparing the target voltage with the preset voltage. According to the method and the device, the first pulse and the second pulse can be input at the same time, and the first pulse and the second pulse can share the overcurrent protection circuit, so that the overcurrent protection circuit and the control method thereof do not need to be arranged for the first pulse and the second pulse independently, and the size of the overcurrent protection circuit is reduced.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a flow chart of a control method of an over-current protection circuit according to an embodiment;
FIG. 2 is a schematic diagram of an embodiment of an over-current protection circuit;
FIG. 3 is a schematic diagram illustrating a connection of an over-current protection circuit module according to an embodiment;
fig. 4 is a schematic pulse diagram according to an embodiment.
Reference numerals illustrate: an access port-100; a comparison module-110; a control module-120; an acquisition module-130; a first acquisition unit-131; a second acquisition unit-132.
For a better description and illustration of embodiments and/or examples of those inventions disclosed herein, reference may be made to one or more of the accompanying drawings. Additional details or examples used to describe the drawings should not be construed as limiting the scope of the disclosed invention, the presently described embodiments and/or examples, and any of the presently understood modes of carrying out the invention.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the present application. Both the first resistor and the second resistor are resistors, but they are not the same resistor.
It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.
It is understood that "at least one" means one or more and "a plurality" means two or more. "at least part of an element" means part or all of the element.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
In one embodiment, referring to fig. 1, a control method of an over-current protection circuit is provided, which is applied to the over-current protection circuit shown in fig. 2 and 3. The control method of the overcurrent protection circuit comprises the following steps:
step S100: simultaneously inputting a first pulse and a second pulse, wherein the first pulse and the second pulse are interlaced pulses.
Step S200: and acquiring a target voltage, wherein the target voltage is the higher voltage of the first pulse and the second pulse in the target time.
Step S300: comparing the target voltage with a preset voltage.
Step S400: when the target voltage is greater than or equal to the preset voltage, determining the pulse causing overcurrent as a first pulse or a second pulse according to the target time corresponding to the target voltage.
In step S100, the first pulse and the second pulse are interlaced pulses. Referring to fig. 4, as an example, a high voltage period of a first pulse corresponds to a low voltage period of a second pulse, and a high voltage period of the second pulse corresponds to a low voltage period of the first pulse. Specifically, when the second pulse is within any one of the low voltages, the first pulse has a complete high voltage period.
The duty ratio of the high voltage period and the low voltage period of the first pulse may be different within the same period. Meanwhile, the duty ratio of the high voltage period and the low voltage period of the second pulse may also be different in the same period. As an example, the high voltage period of the first pulse occupies a relatively small period and the low voltage period occupies a relatively large period within the same period.
Of course, the duty ratio of the high voltage period and the low voltage period of the first pulse may be the same within the same period. Also, the duty ratio of the high voltage period and the low voltage period of the second pulse may be the same within the same period.
The high voltage value of the first pulse may be the same as the high voltage value of the second pulse. The high voltage value of the first pulse may also be different from the high voltage value of the second pulse. As an example, the high voltage value of the first pulse and the high voltage value of the second pulse may both be 3.3V.
Meanwhile, the low voltage value of the first pulse may be the same as the low voltage value of the second pulse. The low voltage value of the first pulse may also be different from the low voltage value of the second pulse. As an example, the high voltage value of the first pulse and the high voltage value of the second pulse may both be 0V.
The first pulse and the second pulse are simultaneously input to the comparison module 110. As an example, the first pulse may be an a pulse and the second pulse may be a C pulse.
In step S200, referring to fig. 4, the target time may be any time after the first pulse and the second pulse are input.
In the target time, the higher voltage of the first pulse and the second pulse is the target voltage. As an example, in the target time, the second pulse is a low voltage, while the first pulse is a high voltage, at which time the target voltage belongs to the first pulse.
In step S300, the preset voltage is the maximum voltage that the circuit can carry. The preset voltage may be related to the load of the whole circuit. As an example, the preset voltage may be 3.3V.
After the target voltage is selected, the comparison module 110 may be controlled to compare the target voltage with the preset voltage. Illustratively, the comparison module 110 includes a comparator. The comparator is provided with a plurality of transistors. At this time, the gate of the transistor is connected to the target voltage, and the threshold voltage of the transistor is a predetermined voltage. At this time, if the transistor is turned on, it is proved that the target voltage is higher than or equal to the preset voltage. If the transistor is not turned on, the target voltage is proved to be lower than the preset voltage. The present embodiment does not specifically limit the internal structure of the comparator.
Of course, if the voltages of the first pulse and the second pulse are equal in the target time, the subsequent steps may not be performed at this time.
In step S400, when the target voltage is greater than or equal to the preset voltage, it is proved that the target voltage is greater than or equal to the preset voltage, and the first pulse or the second pulse corresponding to the target voltage flows.
As an example, if the transistor is turned on, the comparator may output a signal "1". When the signal "1" is received, a target time corresponding to the target voltage is determined. In the target time, the higher voltage of the first pulse and the second pulse is the pulse with the overcurrent condition.
In this embodiment, the first pulse and the second pulse are interlaced, so that a higher voltage and a lower voltage will appear in the first pulse and the second pulse in the target time. At this time, whether the overcurrent phenomenon occurs in the circuit can be known only by comparing the target voltage with the preset voltage. Moreover, in the target time, one of the first pulse and the second pulse has a higher voltage and one of the second pulse has a lower voltage. When the target voltage is greater than or equal to the preset voltage, the first pulse or the second pulse can be quickly detected according to the target time corresponding to the target voltage. Therefore, the first pulse and the second pulse can be input at the same time, that is, the first pulse and the second pulse can share the overcurrent protection circuit and the control method thereof, and the overcurrent protection circuit and the control method thereof do not need to be arranged for the first pulse and the second pulse independently, so that the volume of the overcurrent protection circuit is reduced.
In one embodiment, after step S300, it includes:
step S500: and when the target voltage is smaller than the preset voltage, determining that no overcurrent event occurs.
As an example, when the target voltage is less than the preset voltage, the diode in the comparator is not turned on, and at this time, the comparator may output a signal "0".
In one embodiment, after step S500, it includes:
step S600: and starting overcurrent protection.
As an example, the overcurrent protection circuit sets an alarm or a circuit breaker. Activating the over-current protection may include issuing an alarm signal, or controlling the circuit breaker to trip. The alarm signal can be a booming alarm system or a popup window on a client interface, etc., so as to remind a worker of paying attention.
In one embodiment, in step S100, the first switch and the second switch may be turned on, so that the first pulse and the second pulse are input into the overcurrent protection circuit, respectively.
A first switch is arranged between the overcurrent protection circuit and the first sampling module, and a second switch is arranged between the overcurrent protection circuit and the second sampling module. When the first switch is turned on, the first pulse flows into the overcurrent protection circuit from the first sampling module. When the second switch is turned on, the second pulse flows into the overcurrent protection circuit from the second sampling module.
Referring to fig. 2, the first pulse is illustratively input from pua+ and the second pulse is input from puc+. The first switch is K1, and the second switch is K2.
And after the overcurrent protection detection is finished, the first switch and the second switch are opened.
As an example, the first switch and the second switch may each be a diode. The first switch comprises a first diode, the cathode of the first diode is connected with the access port 100, and the anode of the first diode is connected with the first acquisition unit 131. The second switch comprises a second diode, the cathode of the second diode is connected with the access port 100, and the anode of the second diode is connected with the second acquisition unit 132. As an example, a mutual inductance sampling method may be employed. The first and second acquisition units 131 and 132 may be different transformers, respectively.
In this embodiment, by setting the first switch and the second switch, the time of overcurrent protection detection is flexibly controlled. Furthermore, the first switch and the second switch may each be a diode, preventing the first pulse and the second pulse from being connected to each other.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least a portion of the steps in fig. 1 may include a plurality of steps or stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily sequential, but may be performed in rotation or alternatively with at least a portion of the steps or stages in other steps or other steps.
In one embodiment, referring to fig. 2 and 3, an overcurrent protection circuit is provided, which includes: an access port 100, a comparison module 110 and a control module 120.
The access port 100 is used to input a first pulse and a second pulse simultaneously. The first pulse and the second pulse are interlaced pulses. As an example, the high voltage period of the first pulse corresponds to the low voltage period of the second pulse, and the high voltage period of the second pulse corresponds to the low voltage period of the first pulse. For another example, when the second pulse is within any one of the low voltages, the first pulse has a full high voltage period.
The high voltage value of the first pulse may be the same as the high voltage value of the second pulse. The high voltage value of the first pulse may also be different from the high voltage value of the second pulse. As an example, the high voltage value of the first pulse and the high voltage value of the second pulse may both be 3.3V.
Meanwhile, the low voltage value of the first pulse may be the same as the low voltage value of the second pulse. The low voltage value of the first pulse may also be different from the low voltage value of the second pulse. As an example, the high voltage value of the first pulse and the high voltage value of the second pulse may both be 0V.
The first pulse and the second pulse are simultaneously input to the comparison module 110. As an example, the first pulse may be an a pulse and the second pulse may be a C pulse.
An input of the comparison module 110 is connected to the access port 100. The comparing module 110 is configured to compare a target voltage with a preset voltage, wherein the target voltage is a higher voltage of the first pulse and the second pulse in the target time. As an example, in the target time, the second pulse is a low voltage, while the first pulse is a high voltage, at which time the target voltage is the first pulse.
Illustratively, the comparison module 110 includes a comparator. The comparator is provided with a plurality of transistors. At this time, the gate of the transistor is connected to the target voltage, and the threshold voltage of the transistor is a predetermined voltage. At this time, if the transistor is turned on, it is proved that the target voltage is higher than or equal to the preset voltage. If the transistor is not turned on, the target voltage is proved to be lower than the preset voltage.
The control module 120 connects the access port 100 with the comparison module 110. The control module 120 is configured to execute the control method of the above-mentioned overcurrent protection circuit. Specifically, the control module 120 is configured to control the access port 100 to simultaneously input the first pulse and the second pulse, and determine the pulse causing the overcurrent to be the first pulse or the second pulse according to the target time corresponding to the target voltage when the target voltage is greater than or equal to the preset voltage.
In this embodiment, by setting the first pulse and the second pulse to be interlaced, the access port 100 inputs the first pulse and the second pulse at the same time, so that one of the first pulse and the second pulse has a higher voltage and one of the second pulse has a lower voltage in the target time. At this time, only the comparison module 110 compares the target voltage with the preset voltage to determine whether the overcurrent phenomenon occurs in the circuit. Moreover, in the target time, one of the first pulse and the second pulse has a higher voltage and one of the second pulse has a lower voltage. This makes it possible for the control module 120 to quickly check whether the target voltage is the first pulse or the second pulse according to the target time corresponding to the target voltage when the target voltage is greater than or equal to the preset voltage. Therefore, the first pulse and the second pulse can be input at the same time, that is, the first pulse and the second pulse can share the overcurrent protection circuit, and the overcurrent protection circuit is not required to be arranged for the first pulse and the second pulse independently, so that the volume of the overcurrent protection circuit is reduced.
In one embodiment, the over-current protection circuit includes a protection module.
The protection module is connected to the control module 120 for performing overcurrent protection. As an example, the protection module includes an alarm or a circuit breaker. When the target voltage is greater than or equal to the preset voltage, the protection module sends out an alarm signal or controls the circuit breaker to trip.
In one embodiment, the over-current protection circuit includes a collection module 130.
The acquisition module 130 comprises a first acquisition unit 131 and a second acquisition unit 132, the first acquisition unit 131 and the second acquisition unit 132 are connected with each other and are connected with the access port 100, the first acquisition unit 131 is used for acquiring first pulses, and the second acquisition unit 132 is used for acquiring second pulses.
As an example, the present embodiment may employ a mutual inductance sampling method. The first and second acquisition units 131 and 132 may be different transformers, respectively. The transformer changes the current in the tested circuit into voltage signals induced at two ends of the transformer, so that the current measurement is realized. The mutual inductance measurement method adopted by the embodiment has very small influence on the tested circuit, can not cause interference on other elements in the tested circuit, and has high measurement precision and small error.
In one embodiment, the acquisition module 130 includes a first switch and a second switch.
The first switch and the second switch are respectively connected to the acquisition module 130 and the access port 100. When the first switch is turned on, a first pulse is input from the first acquisition unit to the access port 100. When the second switch is turned on, a second pulse is input from the second acquisition unit to the access port 100.
Illustratively, the first switch includes a first diode, a cathode of which is connected to the access port 100, and an anode of which is connected to the first collecting unit 131. The second switch comprises a second diode, the cathode of the second diode is connected with the access port 100, and the anode of the second diode is connected with the second acquisition unit 132.
Referring to fig. 2, the first pulse is illustratively input from pua+ and the second pulse is input from puc+. The first switch is K1, and the second switch is K2.
In this embodiment, by setting the first switch and the second switch, the control module 120 can flexibly control the time of the overcurrent protection detection. Furthermore, the first switch and the second switch may each be a diode, preventing the first pulse and the second pulse from being connected to each other.
In one embodiment, the over-current protection circuit may provide a current limiting resistor. Referring to fig. 2, the resistor R1 is a current limiting resistor. The current limiting resistor can prevent the overcurrent from damaging the overcurrent protection circuit due to overlarge current.
In one embodiment, the over-current protection circuit may provide a filter capacitor. Referring to fig. 2, a capacitor C1 is a filter capacitor. The filter capacitor can filter clutter.
In the description of the present specification, reference to the term "some embodiments," "other embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (10)
1. A method for controlling an overcurrent protection circuit, the method comprising the steps of:
simultaneously inputting a first pulse and a second pulse, wherein the first pulse and the second pulse are staggered pulses, and when the second pulse is positioned in any section of low voltage, the first pulse has a complete high voltage period;
acquiring a target voltage, wherein the target voltage is the higher voltage of the first pulse and the second pulse in a target time;
comparing the target voltage with a preset voltage;
when the target voltage is larger than the preset voltage, determining that the pulse causing overcurrent is the first pulse or the second pulse according to the target time corresponding to the target voltage;
when the target voltage is greater than or equal to the preset voltage, determining that the pulse causing the overcurrent is the first pulse or the second pulse according to the target time corresponding to the target voltage includes:
and starting overcurrent protection.
2. The method according to claim 1, wherein after comparing the target voltage with the preset voltage, comprising:
and when the target voltage is smaller than or equal to the preset voltage, determining that no overcurrent event occurs.
3. The method according to claim 1, wherein the first pulse is an a pulse and the second pulse is a C pulse.
4. The method of controlling an overcurrent protection circuit according to claim 1, wherein the starting the overcurrent protection includes:
sending out an alarm signal;
and/or the number of the groups of groups,
the first pulse or the second pulse is turned off.
5. An overcurrent protection circuit, comprising:
the access port is used for inputting a first pulse and a second pulse, the first pulse and the second pulse are staggered, and when the second pulse is positioned in any section of low voltage, the first pulse has a complete high-voltage period;
the input end of the comparison module is connected with the access port and is used for comparing a target voltage with a preset voltage, wherein the target voltage is the higher voltage of the first pulse and the second pulse in a target time;
the control module is connected with the comparison module and is used for determining that the pulse causing overcurrent is the first pulse or the second pulse according to the target time corresponding to the target voltage when the target voltage is greater than or equal to the preset voltage;
and the protection module is connected with the control module and is used for performing overcurrent protection.
6. The overcurrent protection circuit of claim 5, wherein the protection module comprises an alarm and/or the protection module comprises a circuit breaker.
7. The overcurrent protection circuit of claim 5, wherein the overcurrent protection circuit comprises:
the acquisition module comprises a first acquisition unit and a second acquisition unit, wherein the output end of the first acquisition unit is connected with the output end of the second acquisition unit and is connected with the access port, the input end of the first acquisition unit is used for acquiring the first pulse, and the input end of the second acquisition unit is used for acquiring the second pulse.
8. The overcurrent protection circuit of claim 7, wherein the first and second acquisition units are each different transformers.
9. The overcurrent protection circuit of claim 7, wherein the acquisition module comprises:
the device comprises a first switch and a second switch, wherein two ends of the first switch are respectively connected with the first acquisition unit and the access port, and two ends of the second switch are respectively connected with the second acquisition unit and the access port.
10. The overcurrent protection circuit of claim 9, wherein the first switch comprises a first diode, a cathode of the first diode is connected to the access port, an anode of the first diode is connected to the first acquisition unit, and the second switch comprises a second diode, a cathode of the second diode is connected to the access port, and an anode of the second diode is connected to the second acquisition unit.
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