An overcurrent protection circuit, a communication system, and an overcurrent protection method.

Abstract

This invention discloses an overcurrent protection circuit, a communication system, and an overcurrent protection method. The communication system includes at least two communication nodes. Each communication node includes a power supply terminal, a common-mode inductor, and a ground terminal. The power supply terminal is sequentially connected to the first coil of the common-mode inductor, the first line of the communication bus, the load, the second line of the communication bus, the second coil of the common-mode inductor, and the ground terminal. An overcurrent protection circuit is correspondingly installed in each communication node, including an overcurrent protection module. The module's first end is connected to the second coil of the common-mode inductor, its second end is connected to the ground terminal, and its third end is connected between the power supply terminal and the first coil of the common-mode inductor. This module controls the communication node to disconnect from power when the load current is too high. This invention enables hardware-controlled overcurrent protection with a high response speed, allowing for more timely overcurrent protection and improving the overall reliability of the communication system.

Description

Technical Field

[0001] This invention relates to the field of electronic power technology, and more specifically, to an overcurrent protection circuit, a communication system, and an overcurrent protection method. Background Technology

[0002] With the rapid development of technology, people have increasingly higher requirements for the reliability of communication systems. Multi-node network power carrier communication technology has the advantage of convenient wiring. In communication systems using this technology, power supply and communication share a single bus. Electrical and communication signals coexist on the same communication bus. Multiple communication nodes and a load are connected in parallel on the same communication bus, and only one communication node can supply power to the load. Therefore, a superior power supply control scheme is needed to ensure the reliability of the power supply system. If the current in the communication circuit is too high, it will damage the load. To avoid overcurrent, current overcurrent protection schemes generally adopt software protection, which has a low response speed, resulting in untimely overcurrent protection and thus reducing the reliability of the entire communication system.

[0003] For existing communication systems, the use of software control for overcurrent protection results in a slow response speed, and no effective solution has yet been proposed. Summary of the Invention

[0004] This invention provides an overcurrent protection circuit, a communication system, and an overcurrent protection method to solve the problem of low response speed in existing communication systems that use software control for overcurrent protection.

[0005] To solve the above-mentioned technical problems, the present invention provides an overcurrent protection circuit applied to a communication system. The communication system includes at least two communication nodes, each communication node including a power supply terminal, a common-mode inductor, and a ground terminal. The power supply terminal is sequentially connected to the first coil of the common-mode inductor, the first line of the communication bus, the load, the second line of the communication bus, the second coil of the common-mode inductor, and the ground terminal. The overcurrent protection circuit is correspondingly configured in each communication node, including:

[0006] An overcurrent protection module has its first end connected to the second coil of the common-mode inductor, its second end connected to the ground terminal, and its third end connected between the power supply terminal and the first coil of the common-mode inductor. It is used to control the communication node to disconnect power when the load current is too high.

[0007] Furthermore, the overcurrent protection module includes:

[0008] The first switching transistor has its first terminal connected to the second coil of the common-mode inductor;

[0009] The first resistor has its first end connected to the first terminal of the first switching transistor, and its second end grounded.

[0010] The second switch has its third terminal connected to the sampling point between the first switch and the first resistor, its second terminal grounded, and its first terminal connected to the power supply terminal and the first coil of the common mode inductor through the second resistor. The second switch is used to turn off when the voltage at the sampling point is greater than a first threshold, thereby controlling the first switch to turn off, and thus controlling the power outage of the communication node.

[0011] Furthermore, the overcurrent protection module also includes:

[0012] The third switching transistor has its first terminal connected to the second resistor, and its second terminal connected to the first terminal of the second switching transistor.

[0013] An MCU control chip has its input terminal connected to the sampling point and its output terminal connected to the third terminal of the third switching transistor, and is used to control the switching on and off of the third switching transistor according to the voltage of the sampling point.

[0014] Furthermore, the overcurrent protection module also includes:

[0015] The third resistor is located between the output terminal of the MCU control chip and the third terminal of the third switching transistor.

[0016] Furthermore, the overcurrent protection module also includes:

[0017] A fourth resistor is connected in parallel between the second and third terminals of the first switching transistor.

[0018] Furthermore, the overcurrent protection module also includes:

[0019] The fifth resistor is positioned between the third terminal of the second switching transistor and the sampling point.

[0020] Furthermore, the overcurrent protection circuit also includes:

[0021] A unidirectional diode, the anode of which is connected to the power supply terminal and the cathode of which is connected to the first coil of the common-mode inductor.

[0022] Furthermore, the overcurrent protection circuit also includes:

[0023] The fourth switching transistor has its first terminal connected to the power supply terminal, its second terminal connected to the first coil of the common mode inductor, and its third terminal connected to the third terminal of the overcurrent protection module.

[0024] The present invention also provides a communication system including the above-described overcurrent protection circuit.

[0025] Furthermore, the communication system is an air conditioning system, which includes at least two indoor units connected to the communication bus. The power supply terminal, the first coil of the common mode inductor, the second coil of the common mode inductor, the grounding terminal, and the overcurrent protection circuit are disposed in the indoor unit. The load is the wired controller of the air conditioning system.

[0026] The present invention also provides an overcurrent protection method applied to the above-mentioned overcurrent protection circuit, the method comprising:

[0027] After the communication node is powered off, it is determined whether the sampling point voltage flowing through the overcurrent protection module is greater than the second threshold.

[0028] If so, then the overcurrent protection module will be powered off.

[0029] Furthermore, controlling the overcurrent protection module to disconnect from power includes:

[0030] The output terminal of the MCU control chip outputs a low-level signal to the third terminal of the third switch of the overcurrent protection module to control the third switch to turn off, thereby de-energizing the overcurrent protection module.

[0031] The overcurrent protection module includes: a first switching transistor, the first terminal of which is connected to the second coil of the common-mode inductor; a first resistor, the first end of which is connected to the first terminal of the first switching transistor, and the second end of which is grounded; a second switching transistor, the third terminal of which is connected to the sampling point between the first switching transistor and the first resistor, the second terminal of which is grounded, and the first terminal of which is connected to the power supply terminal and the first coil of the common-mode inductor through the second resistor; and a third switching transistor, the first terminal of which is connected to the second resistor, the second terminal of which is connected to the first terminal of the second switching transistor, and the third terminal of which is connected to the output terminal of the MCU control chip.

[0032] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the program, when executed by a processor, implements the above-described overcurrent protection method.

[0033] By applying the technical solution of this invention, an overcurrent protection module is set in each communication node of the communication system. When the load current is too high, the overcurrent protection module controls the power-on communication node in the communication system to be de-energized. This enables overcurrent protection through hardware control, with a high response speed and more timely overcurrent protection, thereby improving the reliability of the entire communication system. Attached Figure Description

[0034] Figure 1 This is a structural diagram of an overcurrent protection circuit according to an embodiment of the present invention;

[0035] Figure 2This is a structural diagram of an overcurrent protection circuit according to another embodiment of the present invention;

[0036] Figure 3 This is a structural diagram of an air conditioning system according to an embodiment of the present invention;

[0037] Figure 4 This is a flowchart of an overcurrent protection method according to an embodiment of the present invention. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0039] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” as used in the embodiments of this invention and the appended claims are also intended to include the plural forms, and “multiple” generally includes at least two unless the context clearly indicates otherwise.

[0040] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0041] It should be understood that although the terms first, second, third, etc., may be used to describe switching transistors in the embodiments of the present invention, these switching transistors should not be limited to these terms. These terms are only used to distinguish different switching transistors. For example, without departing from the scope of the embodiments of the present invention, a first switching transistor may also be referred to as a second switching transistor, and similarly, a second switching transistor may also be referred to as a first switching transistor.

[0042] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0043] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or device. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device that includes said element.

[0044] The optional embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0045] Example 1

[0046] This embodiment provides an overcurrent protection circuit for use in a communication system. Figure 1 The diagram illustrates the structure of an overcurrent protection circuit according to an embodiment of the present invention. The communication system includes at least two communication nodes. Each communication node includes a power supply terminal VDD, a common-mode inductor, and a ground terminal GND. The power supply terminal VDD is sequentially connected to the first coil L1 of the common-mode inductor, the first line of the communication bus, the load, the second line of the communication bus, the second coil L2 of the common-mode inductor, and the ground terminal GND. Each communication node also includes a communication module. The communication module is connected to the second line of the communication bus via a receiving channel and to the first line of the communication bus via a transmitting channel. The receiving channel includes two capacitors connected in parallel, and the transmitting channel internally includes two capacitors connected in parallel.

[0047] like Figure 1 As shown, an overcurrent protection circuit is installed in each communication node of the communication system. This overcurrent protection circuit includes:

[0048] The overcurrent protection module 10 has its first end connected to the second coil L2 of the common mode inductor, its second end connected to the ground terminal GND, and its third end connected between the power supply terminal VDD and the first coil L1 of the common mode inductor. It is used to control the communication node to disconnect when the load current is too high.

[0049] The overcurrent protection circuit in this embodiment sets up an overcurrent protection module in each communication node of the communication system. When the load current is too high, the overcurrent protection module controls the power-on communication node in the communication system to cut off the power. It can realize overcurrent protection through hardware control, with a high response speed and more timely overcurrent protection, thus improving the reliability of the entire communication system.

[0050] To enable power-off control of the communication node when the load current is too high, as mentioned above... Figure 1 As shown, the overcurrent protection module 10 includes:

[0051] The first switching transistor Q1 has its first terminal connected to the second coil L2 of the common-mode inductor;

[0052] The first resistor R1 has its first end connected to the first terminal of the first switching transistor Q1, and its second end grounded.

[0053] The second switch Q2 has its third terminal connected to the sampling point between the first switch Q1 and the first resistor R1, its second terminal grounded, and its first terminal connected to the power supply terminal VDD and the first coil L1 of the common mode inductor through the second resistor R2. The second switch Q2 is used to turn off when the voltage at the sampling point is greater than a first threshold, thereby controlling the first switch Q1 to turn off, and thus controlling the power outage of the communication node.

[0054] When one of the communication nodes is powered on, its internal first switch Q1 is in the on state. The current flow is as follows: power terminal VDD → first coil L1 of common mode inductor → load → second coil L2 of common mode inductor → first switch Q1 → first resistor R1 → ground terminal GND. The first resistor R1 is the current sampling resistor. When the load current increases due to some reason, resulting in overcurrent, the voltage across the first resistor R1 is the voltage V of the sampling point ADC. ADC It increases with increasing current, if voltage V ADC Increase to the turn-on voltage Von (i.e., V) of the second switch Q2 ADC >Von), the second switch Q2 is turned on and grounded. Since the voltage drop between the emitter and collector of the switch is very small, the base voltage of the first switch Q1 is close to 0, and the first switch Q1 is turned off. The power supply circuit of the above communication node is cut off. At this time, the current flow is: power terminal VDD → second resistor R2 → second switch Q2 → ground terminal GND. By introducing the current into the overcurrent protection circuit, the complex damage caused by overcurrent is avoided, and hardware overcurrent protection is realized.

[0055] After implementing hardware overcurrent protection, there is current in the overcurrent protection circuit. Its internal components will heat up due to the power supply, consuming electrical energy. To avoid wasting electrical energy, if the voltage V of the sampling point ADC... ADC If the current continues to rise, software overcurrent protection can be used to completely control the overcurrent protection circuit to cut off power.

[0056] Therefore, the above-mentioned overcurrent protection module 10 further includes: a third switch Q3, the first terminal of which is connected to the second resistor R2, and the second terminal of which is connected to the first terminal of the second switch Q2; and an MCU control chip, the input terminal of which is connected to the sampling point ADC, and the output terminal of which is connected to the third terminal of the third switch Q3, for controlling the on / off state of the third switch Q3 according to the voltage of the sampling point ADC.

[0057] After implementing hardware overcurrent protection, if the voltage across the first resistor R1 is greater than the software overcurrent protection voltage, the MCU control chip detects this voltage and actively controls the output terminal POWER_CTRL to go low, thereby controlling the third switch Q3 to turn off, so that the overcurrent protection module 10 is powered off, thus realizing software overcurrent protection.

[0058] In summary, by combining hardware and software overcurrent protection, the reliability of the communication system is improved, while energy saving is also achieved.

[0059] To prevent the base current of the third switch Q3 from becoming too large and burning out the third switch Q3, the overcurrent protection module 10 further includes a third resistor R3, which is disposed between the output terminal of the MCU control chip and the third terminal of the third switch Q3, and is used to limit the base current of the third switch Q3.

[0060] To ensure that the base voltage of the first switching transistor Q1 is greater than the emitter voltage, the overcurrent protection module 10 further includes a fourth resistor R4, which is connected in parallel between the second and third terminals of the first switching transistor Q1 to generate a voltage drop, so that the base voltage of the first switching transistor Q1 is greater than the emitter voltage.

[0061] Similarly, to prevent the base current of the second switching transistor Q2 from becoming too high and burning out Q2, the overcurrent protection module 10 further includes:

[0062] The fifth resistor R5 is placed between the third terminal of the second switch Q2 and the sampling point ADC.

[0063] To prevent the current from flowing in the opposite direction, such as Figure 1 As shown, the overcurrent protection circuit further includes:

[0064] A unidirectional diode D has its anode connected to the power supply terminal VDD and its cathode connected to the first coil L1 of the common-mode inductor.

[0065] Example 2

[0066] As mentioned earlier, the receiving channel includes two capacitors connected in parallel, and the transmitting channel also includes two capacitors connected in parallel. In the above circuit scheme, if the second communication node is powered on, the first communication node is in a non-powered state. The unidirectional diode D of the non-powered node controls the current flowing into the power terminal. The first switch Q1 controls the power supply and non-power supply states of the communication node. When the base input of the first switch Q1 is high, the communication node is in a powered state; when the base input of the first switch Q1 is low, the communication node is in a non-powered state. This can meet the power supply interruption requirements of the indoor unit. However, since a communication module is set on the bus of the communication system, the communication module isolates DC signals in the receiving and transmitting channels through capacitors. During the signal transmission and reception process of the communication module, the capacitor is constantly charging and discharging. During the charging and discharging process, the power terminal VDD can form a current loop through the capacitor and the ground terminal of the communication module. The current direction is as follows: Figure 1 As shown by the middle arrow, the instantaneous power supply voltage is repeatedly applied to the communication module, which damages the stability of the communication module, affects its lifespan, and consequently affects the stability of the entire communication system. On the other hand, the formation of a loop results in power loss, leading to energy waste.

[0067] To address this problem, the present invention provides another embodiment. Figure 2 A structural diagram of an overcurrent protection circuit according to another embodiment of the present invention is shown below. Figure 2 As shown, the overcurrent protection circuit further includes a fourth switching transistor Q4, whose first terminal is connected to the power supply terminal VDD, its second terminal is connected to the first coil L1 of the common-mode inductor, and its third terminal is connected to the third terminal of the overcurrent protection module 10. The fourth switching transistor Q4 replaces... Figure 1 The unidirectional diode in the circuit uses a dual-tube control method to control the current flowing into the power supply terminal VDD. When the third switch Q3 is turned off, the fourth switch Q4 and the first switch Q1 of the power supply module are turned off, ensuring that the power supply to the communication node that is not powered is completely disconnected. The communication module only has communication signals and is not affected by power supply interference, thereby improving circuit reliability and saving power.

[0068] Example 3

[0069] This embodiment provides a communication system, as mentioned above. Figure 1As shown, the communication system includes at least two communication nodes. Each communication node includes a power supply terminal VDD, a common-mode inductor, and a ground terminal GND. The power supply terminal VDD is sequentially connected to the first coil L1 of the common-mode inductor, the first line of the communication bus, the load, the second line of the communication bus, the second coil L2 of the common-mode inductor, and the ground terminal GND. Each communication node also includes a communication module. The communication module is connected to the second line of the communication bus through a receiving channel and to the first line of the communication bus through a transmitting channel. The receiving channel includes two capacitors connected in parallel, and the transmitting channel internally includes two capacitors connected in parallel. It also includes the overcurrent protection circuit described in any of the above embodiments.

[0070] Example 4

[0071] In this embodiment, the communication system is an air conditioning system. Figure 3 This is a structural diagram of an air conditioning system according to an embodiment of the present invention, such as... Figure 3 As shown, the air conditioning system includes at least two indoor units, all of which share a communication bus. The wired controller is connected to the communication bus. When one indoor unit is powered on, the other indoor units are in a non-powered state.

[0072] Each indoor unit is a communication node, and the indoor unit is connected to the communication bus. The power terminal GND, the first coil L1 of the common mode inductor, the second coil L2 of the common mode inductor, the ground terminal GND, and the overcurrent protection circuit are all installed in the indoor unit. The load of the communication system is the wired controller of the air conditioning system.

[0073] Example 5

[0074] This embodiment provides an overcurrent protection method applied to the aforementioned overcurrent protection circuit. Figure 4 A flowchart of an overcurrent protection method according to an embodiment of the present invention is shown below. Figure 4 As shown, the overcurrent protection method includes:

[0075] S101, after the communication node is powered off, determine whether the voltage at the sampling point of the overcurrent protection module is greater than the second threshold.

[0076] S101: When the voltage at the sampling point of the overcurrent protection module is greater than the second threshold, the overcurrent protection module is powered off.

[0077] Specifically, controlling the overcurrent protection module to power off includes: controlling the output terminal of the MCU control chip to output a low-level signal to the third terminal of the third switching transistor of the overcurrent protection module, thereby controlling the third switching transistor to turn off, and thus powering off the overcurrent protection module; wherein, the overcurrent protection module includes: a first switching transistor, the first terminal of which is connected to the second coil of the common-mode inductor; a first resistor, the first terminal of which is connected to the first terminal of the first switching transistor, and the second terminal of which is grounded; a second switching transistor, the third terminal of which is connected to the sampling point between the first switching transistor and the first resistor, the second terminal of which is grounded, and the first terminal of which is connected to the power supply terminal and the first coil of the common-mode inductor through the second resistor; a third switching transistor, the first terminal of which is connected to the second resistor, the second terminal of which is connected to the first terminal of the second switching transistor, and the third terminal of which is connected to the MCU control chip. The above overcurrent method is implemented by the MCU control chip.

[0078] The overcurrent protection method in this embodiment, after implementing hardware overcurrent protection, determines whether the voltage at the sampling point of the overcurrent protection module is greater than a second threshold. When the voltage at the sampling point is greater than the second threshold, the MCU control chip controls the third switch to turn off, thereby controlling the overcurrent protection module to cut off power, thus achieving software overcurrent protection. This avoids the problem of the overcurrent protection module continuing to switch on and off after an overcurrent occurs, leading to wasted power, thus improving the reliability of the communication system and achieving energy saving.

[0079] Example 6

[0080] This embodiment provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described overcurrent protection method.

[0081] The circuit embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0082] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An overcurrent protection circuit, applied in a communication system, characterized in that, The communication system includes at least two communication nodes. Each communication node includes a power supply terminal, a common-mode inductor, and a ground terminal. The power supply terminal is sequentially connected to the first coil of the common-mode inductor, the first line of the communication bus, the load, the second line of the communication bus, the second coil of the common-mode inductor, and the ground terminal. Overcurrent protection circuits are correspondingly installed in each communication node, including: An overcurrent protection module, with its first end connected to the second coil of the common-mode inductor, its second end connected to the ground terminal, and its third end connected between the power supply terminal and the first coil of the common-mode inductor, is used to control the communication node to disconnect power when the load current is too high. The overcurrent protection module includes: a first switching transistor, the first terminal of which is connected to the second coil of the common-mode inductor; a first resistor, the first terminal of which is connected to the first terminal of the first switching transistor, and the second terminal of which is grounded; a second switching transistor, the third terminal of which is connected to a sampling point between the first switching transistor and the first resistor, the second terminal of which is grounded, and the first terminal of which is connected to the power supply terminal and the first coil of the common-mode inductor through the second resistor; the second switching transistor is used to turn off when the voltage at the sampling point is greater than a first threshold, thereby controlling the first switching transistor to turn off, and thus controlling the power outage of the communication node.

2. The overcurrent protection circuit according to claim 1, characterized in that, The overcurrent protection module also includes: The third switching transistor has its first terminal connected to the second resistor, and its second terminal connected to the first terminal of the second switching transistor. An MCU control chip has its input terminal connected to the sampling point and its output terminal connected to the third terminal of the third switching transistor, and is used to control the switching on and off of the third switching transistor according to the voltage of the sampling point.

3. The overcurrent protection circuit according to claim 2, characterized in that, The overcurrent protection module also includes: The third resistor is located between the output terminal of the MCU control chip and the third terminal of the third switching transistor.

4. The overcurrent protection circuit according to claim 1, characterized in that, The overcurrent protection module also includes: A fourth resistor is connected in parallel between the second and third terminals of the first switching transistor.

5. The overcurrent protection circuit according to claim 1, characterized in that, The overcurrent protection module also includes: The fifth resistor is positioned between the third terminal of the second switching transistor and the sampling point.

6. The overcurrent protection circuit according to any one of claims 1 to 5, characterized in that, The overcurrent protection circuit also includes: A unidirectional diode, the anode of which is connected to the power supply terminal and the cathode of which is connected to the first coil of the common-mode inductor.

7. The overcurrent protection circuit according to any one of claims 1 to 5, characterized in that, The overcurrent protection circuit also includes: The fourth switching transistor has its first terminal connected to the power supply terminal, its second terminal connected to the first coil of the common mode inductor, and its third terminal connected to the third terminal of the overcurrent protection module.

8. A communication system, characterized in that, The overcurrent protection circuit includes any one of claims 1 to 7.

9. The communication system according to claim 8, characterized in that, The communication system is an air conditioning system, which includes at least two indoor units connected to the communication bus. The power supply terminal, the first coil of the common mode inductor, the second coil of the common mode inductor, the grounding terminal, and the overcurrent protection circuit are installed in the indoor unit. The load is the wired controller of the air conditioning system.

10. An overcurrent protection method, applied to the overcurrent protection circuit according to any one of claims 1 to 7, characterized in that, The method includes: After the communication node is powered off, it is determined whether the sampling point voltage flowing through the overcurrent protection module is greater than the second threshold. If so, then the overcurrent protection module will be powered off.

11. The overcurrent protection method according to claim 10, characterized in that, Controlling the overcurrent protection module to disconnect power includes: The output terminal of the MCU control chip outputs a low-level signal to the third terminal of the third switch of the overcurrent protection module to control the third switch to turn off, thereby de-energizing the overcurrent protection module. The overcurrent protection module includes: a first switching transistor, the first terminal of which is connected to the second coil of the common-mode inductor; a first resistor, the first end of which is connected to the first terminal of the first switching transistor, and the second end of which is grounded; a second switching transistor, the third terminal of which is connected to the sampling point between the first switching transistor and the first resistor, the second terminal of which is grounded, and the first terminal of which is connected to the power supply terminal and the first coil of the common-mode inductor through the second resistor; and a third switching transistor, the first terminal of which is connected to the second resistor, the second terminal of which is connected to the first terminal of the second switching transistor, and the third terminal of which is connected to the output terminal of the MCU control chip.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the overcurrent protection method as described in claim 10 or 11.

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