Fault handling circuit and fault handling method

Abstract

Provided in the present application are a fault handling circuit and a fault handling method, which help to prevent burnout of devices caused by short circuits. The fault handling circuit comprises: a first current-limiting device, a first breaking device, a driving apparatus, and a voltage conversion apparatus, wherein the first current-limiting device is connected in parallel to the first breaking device, a first terminal of the first current-limiting device and a first terminal of the first breaking device are both connected to a first pole of a power supply, a second terminal of the first current-limiting device and a second terminal of the first breaking device are both connected to a first terminal of the voltage conversion apparatus, and a second terminal of the voltage conversion apparatus is connected to the driving apparatus. The driving apparatus is used for driving, when the driving apparatus is powered on, the first breaking device to turn on, and driving, when the driving apparatus is powered off, the first breaking device to turn off; and the first current-limiting device is used for limiting the magnitude of a current in the circuit after the first breaking device is turned off.

Description

Fault handling circuit and fault handling method

[0001] The present application claims priority to the Chinese patent application No. 202410718546.4, filed on June 4, 2024, and entitled “Fault handling circuit and fault handling method”, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of electronics, and in particular to a fault handling circuit and a fault handling method. BACKGROUND

[0003] In some power consumption scenarios, there may be a short circuit in the circuit. When the circuit is short-circuited, a large current will be generated, which will damage the devices in the circuit and cause a large safety hazard. Therefore, a fuse is usually installed in the circuit. When the current in the circuit exceeds the rated current value of the fuse, the fuse will automatically melt, thereby cutting off the current.

[0004] However, for the circuit using the fuse, the device burnout caused by the short circuit still occurs. SUMMARY

[0005] The present application provides a fault handling circuit and a fault handling method, which are beneficial to avoid the occurrence of device burnout caused by short circuit.

[0006] In a first aspect, a fault handling circuit is provided, comprising: a first current-limiting device, a first breaking device, a driving device, and a voltage conversion device; the first current-limiting device and the first breaking device are connected in parallel, the first end of the first current-limiting device and the first end of the first breaking device are respectively connected to the first pole of a power supply, the second end of the first current-limiting device and the second end of the first breaking device are respectively connected to the first end of the voltage conversion device, and the second end of the voltage conversion device is connected to the driving device.

[0007] The driving device is configured to drive the first breaking device to close when the driving device is powered on, and drive the first breaking device to open when the driving device is powered off. The driving device is powered on when the output voltage of the voltage conversion device is not zero, and the driving device is powered off when the output voltage of the voltage conversion device is zero. The first current-limiting device is configured to limit the size of the current in the circuit after the first breaking device is opened.

[0008] In the application, before the fault handling circuit is powered on, the first breaking device is in an open state, and the output voltage of the voltage conversion device is zero. When the driving device is powered on, because the first current limiting device is connected in parallel with the first breaking device, and the first breaking device is in an open state, the current input from the positive electrode of the power supply flows to the negative electrode of the power supply through the first current limiting device and the voltage conversion device. The input voltage of the voltage conversion device is not zero, and the output voltage of the voltage conversion device is not zero, so that the driving device is powered on and works, and then the driving device drives the first breaking device to close.

[0009] After the first breaking device is closed, during the working of the fault handling circuit, if the output voltage of the voltage conversion device is zero due to a fault of the fault handling circuit (for example, a fault occurs in the circuit between the first breaking device and the voltage conversion device, or the voltage conversion device is faulty), the driving device is powered off, and the driving device drives the first breaking device to open. After the first breaking device is opened, because the first current limiting device is connected in parallel with the first breaking device, the fault current is transmitted through the first current limiting device, so that the size of the fault current in the fault handling circuit can be limited through the first current limiting device, which is beneficial to avoid the situation that a device is burned due to a short circuit.

[0010] In combination with the first aspect, in some implementations of the first aspect, the fault handling circuit further includes a second current limiting device and a second breaking device; the second current limiting device and the second breaking device are connected in parallel, and the first end of the second current limiting device and the first end of the second breaking device are respectively connected to the second level of the power supply.

[0011] The driving device is further configured to drive the second breaking device to close in the case that the driving device is powered on and works, and drive the second breaking device to open in the case that the driving device is powered off. The second current limiting device is configured to limit the size of the current in the circuit in the case that the second breaking device is opened.

[0012] The fault processing circuit of the present application can be used for anti-reverse connection protection of direct current voltage. For a direct current input scene, normally, the positive pole of the power supply is connected to the positive pole of the load, and the negative pole of the power supply is connected to the negative pole of the load. However, in actual operation, due to the operation error of the construction personnel, sometimes the input polarity of the direct current voltage is reversed. In the case of reverse connection, the output voltage of the voltage conversion device is zero, and therefore the driving device is powered off, and the driving device drives the first breaking device and the second breaking device to be disconnected. Assuming that the first level of the power supply is the positive pole and the second level of the power supply is the negative pole, in the case of reverse connection, the fault current flows from the negative pole of the power supply, and in the case of disconnection of the first breaking device and the second breaking device, since the second breaking device is connected in parallel with the second current limiting device, the fault current flowing from the negative pole of the power supply flows to the ground through the second breaking device, thereby avoiding the short circuit problem caused by the direct flow of the fault current to the ground, and further avoiding the device burnout caused by the short circuit.

[0013] In combination with the first aspect, in some implementations of the first aspect, the fault processing circuit further comprises a first protection device and a second protection device; the first protection device is connected in series with the first current limiting device, and the second protection device is connected in series with the first current limiting device; a first end of the first protection device is connected to the first level of the power supply, and a second end of the first protection device is connected to the first end of the voltage conversion device; and a first end of the second protection device is connected to the second level of the power supply. The first protection device and the second protection device are configured to block the current in the fault processing circuit.

[0014] The fault processing circuit of the present application can be used for high voltage protection. In actual operation, due to the operation error of the construction personnel, sometimes the high voltage is mistakenly connected to the low voltage equipment, which may damage the voltage conversion device, causing the output voltage of the voltage conversion device to be zero, and therefore the driving device is powered off, and the driving device drives the first breaking device and the second breaking device to be disconnected. In the case of disconnection of the first breaking device and the second breaking device, since the first breaking device is connected in parallel with the first current limiting device, and the second breaking device is connected in parallel with the second current limiting device, the fault current input from the positive pole of the power supply flows through the first current limiting device, the first protection device, the second current limiting device, and the second protection device to the negative pole of the power supply. At this time, the first current limiting device and the second current limiting device can limit the size of the fault current to avoid the problem of serious device burnout caused by excessive fault current. However, the high voltage may damage the first current limiting device and the second current limiting device. In this case, since the first protection device is connected in series with the first current limiting device, and the second protection device is connected in series with the second current limiting device, in the case of damage of the first current limiting device and the second current limiting device, the first protection device and the second protection device can be quickly disconnected under the action of excessive fault current, thereby blocking the fault current in the circuit, and avoiding the occurrence of more serious device damage problems.

[0015] With reference to the first aspect, in some implementations of the first aspect, the output voltage of the voltage conversion device is zero in the event of a fault of: the voltage conversion device; a circuit between the first breaking device or the second breaking device and the voltage conversion device; a polarity of the input voltage of the fault handling circuit being reversed; or, the input voltage of the fault handling circuit exceeding a rated voltage.

[0016] A second aspect provides a baseboard including the fault handling circuit of the first aspect.

[0017] A third aspect provides a network device including the baseboard of the second aspect.

[0018] A fourth aspect provides a fault handling method applied to a fault handling circuit including: a first current limiting device, a first breaking device, a driving device, and a voltage conversion device; the first current limiting device and the first breaking device are connected in parallel, a first end of the first current limiting device and a first end of the first breaking device are connected to a first pole of a power supply, a second end of the first current limiting device and a second end of the first breaking device are connected to a first end of the voltage conversion device, and a second end of the voltage conversion device is connected to the driving device. The method includes:

[0019] driving the first breaking device to close in the event of the driving device being powered on, and driving the first breaking device to open in the event of the driving device being powered off; wherein the driving device is powered off in the event of the output voltage of the voltage conversion device being zero, and the driving device is powered on in the event of the output voltage of the voltage conversion device being non-zero; and limiting a size of a current in the fault handling circuit after the first breaking device is opened.

[0020] With reference to the fourth aspect, in some implementations of the fourth aspect, the fault handling circuit further includes a second current limiting device and a second breaking device; the second current limiting device and the second breaking device are connected in parallel, and a first end of the second current limiting device and a first end of the second breaking device are connected to a second pole of the power supply. The method further includes: driving the second breaking device to close in the event of the driving device being powered on.

[0021] With reference to the fourth aspect, in some implementations of the fourth aspect, the fault handling circuit further includes a first protection device and a second protection device; the first protection device is connected in series with the first current limiting device, the second protection device is connected in series with the first current limiting device, a first end of the first protection device is connected to the first pole of the power supply, a second end of the first protection device is connected to the first end of the voltage conversion device, and a first end of the second protection device is connected to the second pole of the power supply. The method further includes: blocking the current in the fault handling circuit.

[0022] In combination with the fourth aspect, in some implementations of the fourth aspect, the output voltage of the voltage conversion device is zero in the case that: the voltage conversion device fails; a circuit between the first breaking device or the second breaking device and the voltage conversion device fails; the polarity of the input voltage of the fault handling circuit is reversed; or, the input voltage of the fault handling circuit exceeds the rated voltage.

[0023] In combination with the fourth aspect, in some implementations of the fourth aspect, the first breaking device and the second breaking device are in an open state before the fault handling circuit is powered on.

[0024] It should be understood that the second aspect to the fourth aspect of the present application correspond to the technical solution of the first aspect of the present application, and the beneficial effects achieved by each aspect and the corresponding feasible implementations are similar, which will not be described again. BRIEF DESCRIPTION OF DRAWINGS

[0025] FIG. 1A, FIG. IB, FIG. 3 to FIG. 7 are structural schematic diagrams of the fault handling circuit provided by the embodiments of the present application;

[0026] FIG. 2 is a schematic flow chart of the fault handling method provided by the embodiments of the present application. DETAILED DESCRIPTION

[0027] The technical solution in the present application will be described below in combination with the accompanying drawings.

[0028] Before introducing the fault handling circuit and the fault handling method provided by the embodiments of the present application, the following points will be explained first.

[0029] First, in the embodiments shown below, each term and English abbreviation, such as the current limiting device, the breaking device, the driving device, the voltage conversion device, etc., are all exemplary examples given for the convenience of description, which should not constitute any limitation on the present application. The present application does not exclude the possibility of defining other terms capable of achieving the same or similar functions in the existing or future protocols.

[0030] Second, in the embodiments shown below, the first, the second and various numbers are only used for differentiation for the convenience of description, and are not used to limit the scope of the embodiments of the present application, for example, the first current limiting device and the second current limiting device are used to distinguish two different current limiting devices.

[0031] Third, "at least one" means one or more, "multiple" means two or more. "And / or" describes the association between the associated objects, which means that there can be three relationships, for example, A and / or B, which means that A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after it. "At least one" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b and c can mean a, or b, or c, or a and b, or a and c, or b and c, or a, b and c, where a, b and c can be single or multiple.

[0032] The related technologies and concepts involved in the present application are introduced below.

[0033] With the development of communication equipment bandwidth, the power of network equipment is getting higher and higher, and the single board power consumption gradually evolves from several hundred watts to several thousand watts. In the-48V direct current power supply scenario, the single board current gradually increases from a few amperes (A) to several tens of amperes (A). When designing a single board, overcurrent protection in a fault scenario needs to be considered. When an overcurrent or short circuit occurs in the single board circuit, the fault current is cut off in time to avoid problems such as overheating carbonization caused by large fault currents.

[0034] The working mode of the fault protection device (such as a fuse or an air switch) used in the traditional overcurrent protection mode is to pass a current exceeding the rated current. Due to the thermal effect of the current, the fault protection device is disconnected, thereby blocking the current in the single board circuit, which can avoid damage to the single board.

[0035] Through testing and research, it is found that in the scenario of overheating carbonization of a single board, the fault current does not increase indefinitely due to line impedance. For example, when a 48V voltage is used for power supply, if the single board circuit is working normally, the line impedance is 0.5 ohms (Ω). In the case of extreme short circuit, according to Ohm's law, the maximum fault current generated is 120A.

[0036] In the low-power single board scenario, for example, the rated working current of the single board is 10A, and the specification of the fault protection device is generally 1.5-2 times the rated working current, for example, a fault protection device with a rated specification of 15A is selected. When a short circuit fault occurs in the single board, under the action of the above-mentioned maximum fault current of 120A, the fault protection device will soon be disconnected, thereby avoiding the spread of the fault by power failure.

[0037] In the high-power single board scenario, for example, the rated working current of the single board is 80A, the rated working current of the selected fault protection device is generally 1.5-2 times, for example, the rated specification of the selected fault protection device is 120A, at this time, due to the line impedance, the maximum fault current is consistent with the rated specification of the fault protection device, therefore, when a fault occurs in the rear stage, the fault protection device has not reached the threshold of the disconnection current, and cannot identify the fault in time and block the spread of the fault in time, and thus the device may be burned out.

[0038] Therefore, the application provides a fault processing method and a fault processing circuit. The circuit includes a first current limiting device, a first breaking device, a driving device, and a voltage conversion device. The first current limiting device and the first breaking device are connected in parallel. When a fault occurs in the circuit, the driving device can control the first breaking device to be disconnected, so that the fault current flows through the first current limiting device, thereby limiting the size of the fault current in the circuit, which helps to avoid the device from being burned out due to short circuit.

[0039] The fault processing method described in the embodiments of the application can provide overcurrent protection for the power supply circuit of a high-power base station, a high-power network / server, and the like.

[0040] FIG. 1A is a structural schematic diagram of a fault processing circuit 100 provided by an embodiment of the application. As shown in FIG. 1A, the circuit 100 includes a first current limiting device 101, a first breaking device 102, a voltage conversion device 103, and a driving device 104.

[0041] The first current limiting device 101 and the first breaking device 102 are connected in parallel. The first end of the first current limiting device 101 is connected to the first stage of the power supply, the first end of the first breaking device 102 is connected to the first stage of the power supply, the second end of the first current limiting device 101 is connected to the first end of the voltage conversion device 103, the second end of the first breaking device 102 is connected to the first end of the voltage conversion device 103, and the second end of the voltage conversion device 103 is connected to the driving device 104.

[0042] The first current limiting device 101 is used to limit the size of the current in the circuit 100. The first current limiting device 101 is, for example, a positive temperature coefficient (PTC) device or a power resistor. The PTC device refers to a semiconductor material or a component with a large positive temperature coefficient. The commonly used PTC device is a PTC thermistor.

[0043] The first breaking device 102 is used to control the current flow direction in the circuit 100. When the first breaking device 102 is closed, the current input from the positive pole of the power source flows to the negative pole of the power source through the first breaking device 102; when the first breaking device 102 is opened, the current input from the positive pole of the power source flows to the negative pole of the power source through the first current-limiting device 101. The first breaking device 102 is, for example, a semiconductor device such as a MOS tube, a split-break trip, a relay, a contactor.

[0044] The voltage conversion device 103 is used to convert the form of the input voltage. The voltage conversion device 103 is, for example, an AC-to-DC device, a DC-to-DC device.

[0045] The driving device 104 is used to drive the closing and opening of the first breaking device 102.

[0046] It should be noted that the above-mentioned first current-limiting device 101 can be an independent device or an integration of multiple devices. For example, the circuit 100 requires the resistance value of the first current-limiting device 101 to be 10Ω. In one possible implementation, the first current-limiting device 101 is a 10Ω resistor 1; in another possible implementation, the first current-limiting device 101 includes a resistor 2 and a resistor 3 connected in parallel, wherein the resistance value of the resistor 2 is 20Ω and the resistance value of the resistor 3 is 20Ω, so that the equivalent resistance of the parallel connection is 10Ω; in another possible implementation, the first current-limiting device 101 includes a resistor 4 and a resistor 5 connected in series, wherein the resistance value of the resistor 4 is 5Ω and the resistance value of the resistor 5 is 5Ω, so that the equivalent resistance of the series connection is 10Ω.

[0047] In the structure of the circuit 100, the power-on and power-off of the driving device 104 depend on the output voltage of the voltage conversion device 103. The principle of the driving device 104 driving the closing and opening of the first breaking device 102 will be briefly introduced below.

[0048] When the output voltage of the voltage conversion device 103 is not zero, the driving device 104 is powered on. The driving device 104 generates an electromagnetic field due to electromagnetic induction, which attracts the first breaking device 102 to close. When the output voltage of the voltage conversion device 103 is zero, the driving device 104 is powered off. The electromagnetic field in the driving device 104 disappears, and the first breaking device 102 loses the attraction, so the first breaking device 102 is opened.

[0049] It should be noted that the above is only an example of describing the principle of the driving device 104 driving the closing and opening of the first breaking device 102. The driving device 104 and the breaking device 102 include but are not limited to devices with magnetic core effect, semiconductor controllable switch devices / modules, optical switch devices, etc.

[0050] In a possible implementation, the first level of the power supply is positive, and the second level of the power supply is negative.

[0051] In another possible implementation, the first level of the power supply is negative, and the second level of the power supply is positive.

[0052] In combination with the foregoing description of the structure of the circuit 100, the working principle of the circuit 100 is introduced as follows.

[0053] In the initial state, that is, before the circuit 100 is powered on, the input voltage Vin1 of the circuit 100 is 0, the input voltage Vin2 of the voltage conversion device 103 is 0, and the output voltage Vout of the voltage conversion device 103 is 0. Therefore, the driving device 104 is powered off or not powered on. In this case, the driving device 104 drives the first breaking device 102 to be open, that is, before the circuit 100 is powered on, the first breaking device 102 is always in an open state.

[0054] Suppose that the first level of the power supply is positive, and the second level of the power supply is negative. When the circuit 100 is powered on, Vin1≠0. Since the initial state of the first breaking device 102 is open, the current flows from the positive pole of the power supply to the first current limiting device 101 and the voltage conversion device 103 in sequence. At this time, the input voltage Vin2 of the voltage conversion device 103 is Vin1≠0, the voltage conversion device 103 has a small power output, the output voltage Vout of the voltage conversion device 103 is not 0, and the driving device 104 is powered on and works. In this case, the driving device 104 drives the first breaking device 102 to be closed. The current flow in the power-on scenario is shown by the dashed arrow in FIG. 1A.

[0055] After the first breaking device 102 is closed, the circuit 100 starts to work normally, and the current flow is shown by the dashed arrow in FIG. 1B. Referring to FIG. 1B, Vin2=Vin1≠0. The current flows from the positive pole of the power supply to the first breaking device 102 and the voltage conversion device 103 in sequence until the negative pole of the power supply. The voltage conversion device 103 works in a large power output mode, the Vout of the voltage conversion device 103 is not 0, and the driving device 104 normally powers on and works. The driving device 104 drives the first breaking device 102 to be closed.

[0056] During the working process of the circuit 100, if a fault occurs between the first breaking device 102 and the voltage conversion device 103 (referred to as fault 1), or if the voltage conversion device 103 fails (referred to as fault 2), the structure of the circuit 100 shown in FIG. 1A can timely block the fault and avoid the device burnout caused by short circuit. The fault processing method of the present application is introduced in combination with the structure of the circuit 100.

[0057] FIG. 2 is a schematic flowchart of a fault processing method 200 according to an embodiment of the present application, which can be applied to the circuit 100 shown in FIG. 1A. Referring to FIG. 2, the method 200 includes S201 and S202, and the specific steps are as follows:

[0058] S201, in the case of driving the device powered on, driving the first breaking device to close, and in the case of driving the device powered off, driving the first breaking device to open.

[0059] It should be understood that in the case of the output voltage of the voltage conversion device 103 being zero, the driving device 104 is powered off, and in the case of the output voltage of the voltage conversion device 103 not being zero, the driving device 104 is powered on. The case of the output voltage of the voltage conversion device 103 being zero will be introduced below.

[0060] In the working process of the circuit 100, if the above-mentioned fault 1 occurs to cause the input voltage Vin2 of the voltage conversion device 103 to be approximately zero, this will cause the output voltage Vout of the voltage conversion device 103 to be approximately zero, and thus the driving device 104 is powered off, and the driving device 104 drives the first breaking device 102 to open. After the breaking device 102 is opened, the fault current in the circuit 100 is transmitted to the negative electrode of the power supply through the first current limiting device 101.

[0061] In the working process of the circuit 100, if the above-mentioned fault 2 occurs to cause the output voltage Vout of the voltage conversion device 103 to be approximately zero, thus the driving device 104 is powered off, and the driving device 104 drives the first breaking device 102 to open. After the breaking device 102 is opened, the fault current in the circuit 100 is transmitted to the negative electrode of the power supply through the first current limiting device 101.

[0062] It should be understood that the output voltage of the voltage conversion device 103 being zero is not limited to being zero in the absolute sense, but can be approximately zero, for example, the output voltage of the voltage conversion device 103 being less than a first threshold value can be considered as the output voltage of the voltage conversion device 103 being zero. In the case of the output voltage of the voltage conversion device 103 being less than the first threshold value, the driving device 104 cannot control the first breaking device 102 to close according to the output voltage of the voltage conversion device 103.

[0063] Similarly, the output voltage of the voltage conversion device 103 not being zero is not limited to not being zero in the absolute sense, for example, the output voltage of the voltage conversion device 103 being greater than or equal to a second threshold value can be considered as the output voltage of the voltage conversion device 103 not being zero. In the case of the output voltage of the voltage conversion device 103 being greater than or equal to the second threshold value, the driving device 104 can drive the first breaking device 102 to close according to the output voltage of the voltage conversion device 103.

[0064] The second threshold is greater than or equal to the first threshold.

[0065] S202, limiting the size of the current in the circuit after the first breaking device is disconnected.

[0066] Since the first breaking device 102 is connected in parallel with the first current-limiting device 101, after the first breaking device 102 is disconnected, the current input from the positive pole of the power supply is transmitted through the first current-limiting device 101, so that the first current-limiting device 101 can limit the size of the fault current in the circuit 100, which is conducive to avoiding the situation that the device is burned due to short circuit.

[0067] For a direct current input scenario, normally, the positive pole of the power supply is connected to the positive pole of the load, and the negative pole of the power supply is connected to the negative pole of the load. However, in actual operation, due to the operation error of the construction personnel, sometimes the input polarity of the direct current voltage is reversed (referred to as fault 3), that is, the positive pole of the power supply is connected to the negative pole of the load, and the negative pole of the power supply is connected to the positive pole of the load. In the reversed case, the flow direction of the current is opposite to the polarity of the voltage. For this fault scenario, on the basis of the circuit 100 shown in FIG. 1A, referring to FIG. 3, the circuit 100 further includes a second current-limiting device 105 and a second breaking device 106. Assuming that the first level of the power supply is the positive pole and the second level of the power supply is the negative pole, the flow direction of the fault current in the reversed case is shown as a dashed arrow in FIG. 3.

[0068] The second current-limiting device 105 is connected in parallel with the second breaking device 106, the first end of the second current-limiting device 105 is connected with the second level of the power supply, the first end of the second breaking device 106 is connected with the second level of the power supply, the second end of the second current-limiting device 105 is connected with the voltage conversion device 103, and the second end of the second breaking device 106 is connected with the voltage conversion device 103.

[0069] It should be noted that the first breaking device 102 and the second breaking device 106 can be regarded as two parts of the same breaking device, one of which is connected with the positive pole of the power supply and controls the flow direction of the current input from the positive pole of the power supply, and the other of which is connected with the negative pole of the power supply and controls the flow direction of the current flowing to the negative pole of the power supply.

[0070] For example, the first stage of the power supply is the positive pole, the second stage of the power supply is the negative pole, the first end of the first breaking device 102 is connected with the positive pole of the power supply, if the first breaking device 102 is broken, the current input from the positive pole of the power supply is transmitted through the first current-limiting device 101; if the first breaking device 102 is closed, the current input from the positive pole of the power supply is transmitted through the first breaking device 102, at this time, it can be considered that the positive pole of the power supply is directly connected with the voltage conversion device 103. The first end of the second breaking device 106 is connected with the negative pole of the power supply, if the second breaking device 106 is broken, the current flowing to the negative pole of the power supply is transmitted through the second current-limiting device 105; if the second breaking device 102 is closed, the current flowing to the negative pole of the power supply is transmitted through the second breaking device 102, at this time, it can be considered that the negative pole of the power supply is directly connected with the voltage conversion device 103.

[0071] Based on the structure of the circuit 100 shown in FIG. 3, in the case of the above-mentioned fault 3, the method 200 further comprises S203: driving the second breaking device to be broken in the case of power failure of the driving device.

[0072] Referring to FIG. 3, in the initial state, that is, before the circuit 100 is powered on, the input voltage Vin1 of the circuit 100 is 0, the input voltage Vin2 of the voltage conversion device 103 is 0, and the output voltage Vout of the voltage conversion device 103 is 0, therefore, the driving device 104 is powered off or not powered on, and the driving device 104 drives the first breaking device 102 and the second breaking device 106 to be broken.

[0073] Suppose that the first stage of the power supply is the positive pole, the second stage of the power supply is the negative pole, when the circuit 100 works normally, the output voltage Vout of the voltage conversion device 103 ≠ 0, therefore, the driving device 104 is powered on and works, and the driving device 104 drives the first breaking device 102 and the second breaking device 106 to be closed. However, when the circuit 100 shown in FIG. 3 occurs the above-mentioned fault 3, the output voltage Vout of the voltage conversion device 103 is 0, the driving device 104 is powered off, and then the driving device 104 drives the first breaking device 102 and the second breaking device 106 to be broken. Since the first breaking device 102 and the second breaking device 106 are broken, the fault current flowing from the negative pole of the power supply flows to the grounding point through the second current-limiting device 105, instead of directly flowing from the negative pole of the power supply to the grounding point, so that the second current-limiting device 105 can limit the fault current below the safety threshold, avoiding the situation that the device is burned by the excessive fault current.

[0074] In actual operation, due to the operation error of the construction personnel, sometimes the high voltage is also connected to the low voltage equipment (referred to as fault 4), for example, the construction personnel connects the 220V alternating voltage to a 48V DC input device, so that the high voltage will cause the voltage conversion device to be damaged, overcurrent will be generated in the circuit, and the devices in the circuit will be burned out, which has a large safety hazard. In view of this fault scene, on the basis of the circuit 100 shown in FIG. 3, the circuit 100 further includes a first protection device 107 and a second protection device 108 to cut off the fault current in the circuit as soon as possible and avoid more serious device burnout.

[0075] The first protection device 107 and the second protection device 108 can cut off the power supply in the case of excessive current, and play a role in protecting the circuit.

[0076] For example, the first protection device 107 and the second protection device 108 are fuses, which have a large resistivity and a low melting point, and can quickly heat and melt in the case of excessive current, thereby cutting off the circuit.

[0077] For example, the first protection device 107 and the second protection device 108 are air switches, which will automatically trip when the current in the circuit exceeds the rated working current of the air switch, thereby cutting off the circuit.

[0078] The first protection device 107 is connected in series with the first current limiting device 101, the second protection device 108 is connected in series with the second current limiting device 105, the first end of the first protection device 107 is connected with the first stage of the power supply, the second end of the first protection device 107 is connected with the first end of the voltage conversion device 103, and the first end of the second protection device 108 is connected with the second stage of the power supply.

[0079] In one example, the structure of the circuit 100 is shown in FIG. 4, and the connection relationship of the plurality of devices in the circuit 100 is described more specifically as follows:

[0080] The first end of the first protection device 107 is connected with the first stage of the power supply, including that the first end of the first protection device 107 is connected with the first stage of the power supply through the first current limiting device 101.

[0081] The first end of the second protection device 108 is connected with the second stage of the power supply, including that the first end of the second protection device 108 is connected with the second stage of the power supply through the second current limiting device 105.

[0082] The second end of the first current limiting device 101 is connected with the first end of the voltage conversion device 103, including that the second end of the first current limiting device 101 is connected with the first end of the voltage conversion device 103 through the first protection device 107.

[0083] In the initial state, that is, before the circuit 100 shown in FIG. 4 is powered on, the input voltage Vin1 of the circuit 100 is 0, the input voltage Vin2 of the voltage conversion device 103 is 0, the output voltage Vout of the voltage conversion device 103 is 0, and the driving device 104 is powered off or not powered on. The driving device 104 drives the first breaking device 102 and the second breaking device 106 to be open, that is, before the circuit 100 is powered on, the first breaking device 102 and the second breaking device 106 are always in an open state.

[0084] Based on the structure of the circuit 100 shown in FIG. 4, in the case of the above-mentioned fault 4, the method 200 further includes S204: blocking the current in the circuit.

[0085] Referring to FIG. 4, in the initial state, that is, before the circuit 100 is powered on, the input voltage Vin1 of the circuit 100 is 0, the input voltage Vin2 of the voltage conversion device 103 is 0, and the output voltage Vout of the voltage conversion device 103 is 0. Therefore, the driving device 104 is powered off or not powered on, and the driving device 104 drives the first breaking device 102 and the second breaking device 106 to be open.

[0086] Assuming that the first level of the power supply is positive and the second level of the power supply is negative, when the circuit 100 is working normally, the output voltage Vout of the voltage conversion device 103 is not equal to 0. Therefore, the driving device 104 is powered on and works, and the driving device 104 drives the first breaking device 102 and the second breaking device 106 to be closed. However, when the circuit 100 shown in FIG. 4 has the above-mentioned fault 4, that is, the input voltage of the circuit 100 is greater than the rated voltage, the high voltage can cause the voltage conversion device 103 to be damaged, an overcurrent abnormality occurs, and the output voltage of the voltage conversion device 103 is 0. Therefore, the driving device 104 is powered off or not powered on, and the driving device 104 drives the first breaking device 102 and the second breaking device 106 to be open. In this fault scenario, the flow direction of the fault current is shown by the dashed arrow in FIG. 4. The fault current is transmitted to the negative electrode of the power supply through the first current-limiting device 101, the first protection device 107, the voltage conversion device 103, the second protection device 108, and the second current-limiting device 105.

[0087] In the case of the above-mentioned fault 4, high-voltage input can cause the first current-limiting device 101 and the second current-limiting device 105 to be damaged, thereby causing the impedance characteristics to change. For example, the resistance of the first current-limiting device 101 is originally 20Ω, and after being damaged by high-voltage input, the resistance of the first current-limiting device 101 becomes 2Ω. In this way, the first current-limiting device 101 has little effect on the limitation of the fault current in the circuit 100. The first protection device 107 and the second protection device 108 are quickly opened under the action of a larger fault current, thereby blocking the fault current in the circuit 100 and avoiding more serious device burnout.

[0088] In another scenario, when the construction personnel powers on the circuit 100, the input voltage is the rated voltage, and the circuit 100 can work normally. In this case, the output voltage Vout of the voltage conversion device 103 ≠ 0, and thus the driving device 104 is powered on and works. The driving device 104 drives the first breaking device 102 and the second breaking device 106 to be closed. However, during the working process of the circuit 100, the input voltage of the circuit 100 can be higher than the rated voltage due to the misconnection of the high-voltage line to the circuit 100. In this case, the high voltage in the circuit 100 can damage the circuit conversion device 103, thereby causing an overcurrent abnormality. In the case where the circuit conversion device 103 is damaged and the output voltage Vout of the circuit conversion device 103 = 0, the driving device 104 is powered off, and the driving device 104 drives the first breaking device 102 and the second breaking device 106 to be opened. In this way, the fault current flows through the first current-limiting device 102, the first protection device 107, the second current-limiting device 105, and the second protection device 108, which can damage the first current-limiting device 102 and the second current-limiting device 105. At the same time, the first protection device 107 and the second protection device 108 are quickly opened under the action of the large fault current, thereby blocking the fault current in the circuit 100 and avoiding more serious device burnout.

[0089] The above-described FIG. 4 is only one example of the circuit 100. Based on the circuit 100 shown in FIG. 4, the circuit 100 can have more variant structures, as shown in FIGS. 5 to 7.

[0090] In another example, the structure of the circuit 100 is shown in FIG. 5, and the connection relationship of the plurality of devices in the circuit 100 is described more specifically as follows:

[0091] The first end of the first current-limiting device 101 is connected to the first stage of the power supply, including that the first end of the first current-limiting device 101 is connected to the first stage of the power supply through the first protection device 107.

[0092] The first end of the second current-limiting device 105 is connected to the second stage of the power supply, including that the first end of the second current-limiting device 105 is connected to the second stage of the power supply through the second protection device 108.

[0093] The second end of the first protection device 107 is connected to the first end of the voltage conversion device 103, including that the second end of the first protection device 107 is connected to the first end of the voltage conversion device 103 through the first current-limiting device 101.

[0094] In another example, the structure of the circuit 100 is shown in FIG. 6, and the connection relationship of the plurality of devices in the circuit 100 is described more specifically as follows:

[0095] The second end of the first current-limiting device 101 is connected with the first end of the voltage conversion device 103, including that the second end of the first current-limiting device 101 is connected with the first end of the voltage conversion device 103 through the first protection device 107.

[0096] The first end of the second current-limiting device 105 is connected with the second stage of the power supply, including that the first end of the second current-limiting device 105 is connected with the second stage of the power supply through the second protection device 108.

[0097] The first end of the first protection device 107 is connected with the first stage of the power supply, including that the first end of the first protection device 107 is connected with the first stage of the power supply through the first current-limiting device 101.

[0098] In another example, the structure of the circuit 100 is shown in FIG. 7, and the connection relationship of the plurality of devices in the circuit 100 is described as follows:

[0099] The first end of the first current-limiting device 101 is connected with the first stage of the power supply, including that the first end of the first current-limiting device 101 is connected with the first stage of the power supply through the first protection device 107.

[0100] The second end of the first protection device 107 is connected with the voltage conversion device 103, including that the second end of the first protection device 107 is connected with the first end of the voltage conversion device 103 through the first current-limiting device 101.

[0101] The first end of the second protection device 108 is connected with the second stage of the power supply, including that the first end of the second protection device 108 is connected with the second stage of the power supply through the second current-limiting device 105.

[0102] The fault processing principles of the circuit 100 shown in FIGS. 5 to 7 are similar to the fault processing principle of the circuit 100 shown in FIG. 4, and will not be described herein.

[0103] The embodiment of the present application further provides a base station single board, which comprises the fault processing circuit.

[0104] The embodiment of the present application further provides a server single board, which comprises the fault processing circuit.

[0105] The embodiment of the present application further provides a network device, which comprises the base station single board or the server single board, and the fault processing circuit is used for overcurrent protection of a power supply circuit of the network device, so as to avoid the case that a device of the network device is burned due to short circuit.

[0106] The base station single board and the network device provided by the embodiment of the present application have the beneficial effects brought by the fault processing circuit, which will not be described herein.

[0107] The above-described embodiments can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, the above-described embodiments can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions or computer programs. When the computer instructions or computer programs are loaded or executed on a computer, the processes or functions described in the embodiments of the present application are wholly or partially generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center through a wired (for example, infrared, wireless, microwave, etc.) manner. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. containing one or more available medium collections. The available medium can be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state disk.

[0108] Those skilled in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0109] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be described here.

[0110] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the above-described device embodiments are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0111] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0112] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present alone, or two or more units can be integrated in one unit.

[0113] The functions, if realized in the form of software functional units and sold or used as independent products, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application or the part of the present application that essentially contributes to the prior art or the part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk, and various program code storage media.

[0114] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A fault handling circuit, characterized by Comprising: a first current-limiting device, a first breaking device, a driving device, and a voltage conversion device; the first current-limiting device and the first breaking device are connected in parallel, a first end of the first current-limiting device and a first end of the first breaking device are connected to a first pole of a power supply respectively, a second end of the first current-limiting device and a second end of the first breaking device are connected to a first end of the voltage conversion device respectively, a second end of the voltage conversion device is connected to the driving device; wherein, the driving device is used to drive the first breaking device to close when the driving device is powered on, and drive the first breaking device to open when the driving device is powered off; the driving device is powered on when the output voltage of the voltage conversion device is not zero, and the driving device is powered off when the output voltage of the voltage conversion device is zero; the first current-limiting device is used to limit the size of the current in the circuit when the first breaking device is open.

2. The circuit of claim 1, wherein, The circuit further comprises a second current-limiting device and a second breaking device; the second current-limiting device and the second breaking device are connected in parallel, a first end of the second current-limiting device and a first end of the second breaking device are connected to a second pole of the power supply respectively; wherein, the driving device is further used to drive the second breaking device to close when the driving device is powered on, and drive the second breaking device to open when the driving device is powered off; the second current-limiting device is used to limit the size of the current in the circuit when the second breaking device is open.

3. The circuit of claim 2, wherein, The circuit further comprises a first protection device and a second protection device; the first protection device is connected in series with the first current-limiting device, the second protection device is connected in series with the first current-limiting device, a first end of the first protection device is connected to the first pole of the power supply, a second end of the first protection device is connected to the first end of the voltage conversion device, a first end of the second protection device is connected to the second pole of the power supply; wherein, the first protection device and the second protection device are used to block the current in the circuit.

4. The circuit of claim 3, wherein, The output voltage of the voltage conversion device is zero in the following fault conditions: the voltage conversion device fails; the circuit between the first breaking device or the second breaking device and the voltage conversion device fails; the polarity of the input voltage of the circuit is reversed; or the input voltage of the circuit exceeds the rated voltage.

5. A base station single board, characterized by, Comprising the fault handling circuit according to any one of claims 1 to 4.

6. A network device, comprising: Comprising the base station single board according to claim 5.

7. A fault handling method characterized by, Applied to a fault handling circuit, the circuit comprises a first current-limiting device, a first breaking device, a driving device, and a voltage conversion device: the first current-limiting device and the first breaking device are connected in parallel, a first end of the first current-limiting device and a first end of the first breaking device are connected to a first pole of a power supply respectively, a second end of the first current-limiting device and a second end of the first breaking device are connected to a first end of the voltage conversion device respectively, a second end of the voltage conversion device is connected to the driving device; The method comprises: driving the first breaking device to be closed when the driving device is powered on, and driving the first breaking device to be opened when the driving device is powered off; wherein the driving device is powered off when the output voltage of the voltage conversion device is zero, and the driving device is powered on when the output voltage of the voltage conversion device is not zero; limiting the size of the current in the circuit after the first breaking device is opened.

8. The method of claim 7, wherein, The circuit further comprises a second current-limiting device and a second breaking device; the first end of the second current-limiting device and the first end of the second breaking device are connected with the second stage of the power supply respectively; The method further comprises: driving the second breaking device to be opened when the driving device is powered off.

9. The method of claim 8, wherein, The circuit further comprises a first protection device and a second protection device; the first protection device is connected in series with the first current-limiting device, the second protection device is connected in series with the first current-limiting device, the first end of the first protection device is connected with the first stage of the power supply, the second end of the first protection device is connected with the first end of the voltage conversion device, and the first end of the second protection device is connected with the second stage of the power supply; The method further comprises: blocking the current in the circuit.

10. The method of claim 9, wherein, The output voltage of the voltage conversion device is zero in the following cases: the voltage conversion device fails; the circuit between the first breaking device or the second breaking device and the voltage conversion device fails; the polarity of the input voltage of the circuit is reversed; or the input voltage of the circuit exceeds the rated voltage.

11. The method of claim 10, wherein, Before the circuit is powered on, the first breaking device and the second breaking device are in an open state.

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