Load protection module, power source apparatus having load protection module, and load protection method

Abstract

Provided in the present invention are a load protection module, which can cut off the power supply to a load in a timely manner when an anomaly has occurred in a power source apparatus, so as to protect the load from damage, a power source apparatus having the load protection module, and a load protection method. The load protection module (2A) of the present invention is arranged in a power source apparatus (1) having a power source module (PM) and a voltage division module (DM), wherein the voltage division module supplies power to a load (R) from a load power supply point (A). The load protection module comprises: a cut-off switch (SW0), which is connected between a power source module and a voltage division module; a sampling unit (40), which samples an electrical signal at a load power supply point and sends same to a determination unit; the determination unit (50), which determines, on the basis of the electrical signal received from the sampling unit, whether an anomaly has occurred in a power source apparatus, and sends a determination result to a control unit; and the control unit (30), which controls the on and off of the cut-off switch on the basis of the determination result received from the determination unit.

Description

Load protection module, power supply device provided with the load protection module, and load protection method TECHNICAL FIELD

[0001] The present application relates to a load protection module, a power supply device provided with the load protection module, and a load protection method, which can timely cut off the power supply to the load when the power supply device is abnormal to protect the load from damage. BACKGROUND

[0002] The power supply device is widely used as a device for converting other forms of energy (for example, chemical energy, light energy, heat energy, etc.) into electrical energy and providing it to an electrical equipment. According to the working principle, use, structure, etc., the power supply device can be divided into many types. For example, according to whether the input and output of the power supply device are electrically isolated by a transformer or the like, the power supply device can be divided into a non-isolated power supply device and an isolated power supply device. Among them, the non-isolated power supply device has a wide range of uses because of its simple structure and easy design. However, the safety of such non-isolated power supply device is relatively low, and if an abnormality such as short circuit occurs in the power supply device during operation, it will cause great damage to the load.

[0003] In order to avoid the damage to the load caused by the abnormality such as short circuit of the non-isolated power supply device, the following countermeasures are proposed, that is, a cut-off switch is arranged in the non-isolated power supply device, and if an abnormality occurs in the power supply device during operation, the cut-off switch is opened, thereby cutting off the power supply path to the load and achieving protection of the load.

[0004] However, if the non-isolated power supply device has already been abnormal before use (for example, short-circuited before starting power supply), or an abnormality occurs during operation and the abnormality causes the voltage to rise too fast, the above-mentioned countermeasures of arranging a cut-off switch cannot effectively protect the load, and the load still has the risk of being damaged.

[0005] In addition, in actual use, even if the power supply device is not abnormal, the cut-off switch may be opened due to the false triggering of the protection mechanism, causing the power supply device to stop working. In this case, if it is to be confirmed whether the power supply device is really abnormal, it is quite laborious, but if the power supply device or part of the elements is directly replaced, it will cause unnecessary waste. SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] The present application is completed in view of the above-mentioned situation, and the purpose is to provide a load protection module, a power supply device provided with the load protection module, and a load protection method, which can timely cut off the power supply to the load when the power supply device is abnormal to protect the load from damage.

[0008] Technical solutions for solving problems

[0009] According to one aspect of the present application, a load protection module is provided, which is arranged in a power supply device having a power supply module and a voltage dividing module, the voltage dividing module supplies power to a load from a load power supply point, wherein,

[0010] The load protection module comprises:

[0011] a cut-off switch connected between the power supply module and the voltage dividing module;

[0012] a sampling unit which samples an electrical signal of the load power supply point and sends it to a judging unit;

[0013] a judging unit which judges whether the power supply device is abnormal according to the electrical signal received from the sampling unit and sends the judging result to a control unit; and

[0014] a control unit which controls the conduction and disconnection of the cut-off switch according to the judging result received from the judging unit.

[0015] Preferably, the load protection module of the present application further comprises:

[0016] a resistor having one end connected to a line between the power supply module and the cut-off switch and the other end connected to a line between the cut-off switch and the voltage dividing module via the control unit.

[0017] Preferably, when the power supply device initially starts to supply power, the cut-off switch is in a disconnected state, and current flows from the power supply module to the voltage dividing module via the resistor and the control unit,

[0018] if the power supply device has already been abnormal when it initially starts to supply power, the resistor is burnt out,

[0019] if the power supply device is not abnormal when it initially starts to supply power, the resistor will not be burnt out, the sampling unit judges that the power supply device is not abnormal according to the sampled electrical signal, and the control unit makes the cut-off switch conductive, and current flows to the voltage dividing module via the cut-off switch.

[0020] Preferably, in the load protection module of the present application, if the sampling unit judges that the power supply device is abnormal according to the sampled electrical signal, the control unit makes the cut-off switch disconnected.

[0021] Preferably, in the load protection module of the present application, after the cut-off switch is disconnected, the power supply module is restarted to re-supply power to the power supply device.

[0022] Preferably, in the load protection module of the present application, the electric signal is a voltage signal at the power supply point of the load.

[0023] Preferably, in the load protection module of the present application, the sampling unit judges that the power supply device is abnormal when the voltage signal is lower than or equal to a given threshold value.

[0024] Preferably, in the load protection module of the present application, the sampling unit judges that the power supply device is not abnormal when the voltage signal is higher than a given threshold value.

[0025] Alternatively, in the load protection module of the present application, the electric signal is a current signal at the power supply point of the load.

[0026] Preferably, in the load protection module of the present application, the voltage dividing module has a first voltage dividing element and a second voltage dividing element connected in series, the first voltage dividing element is closer to the cut-off switch than the second voltage dividing element, and the power supply point of the load is located between the first voltage dividing element and the second voltage dividing element.

[0027] Preferably, in the load protection module of the present application, the abnormality is a short circuit of the first voltage dividing element.

[0028] According to another aspect of the present application, there is provided a power supply device provided with the above load protection module.

[0029] Preferably, the power supply device can be a non-isolated power supply device.

[0030] According to another aspect of the present application, there is provided a load protection method, which is implemented by the load protection module of the present application, wherein,

[0031] The load protection method comprises:

[0032] Step 1: starting the power supply module of the power supply device to supply power, at this time, the cut-off switch is in an open state, the sampling unit does not sample, and the current flows to the voltage dividing module through the resistor and the control unit;

[0033] Step 2: if the power supply device has been abnormal before starting to supply power, the current causes the resistor to burn out, and the power supply device does not supply power to the load, if the power supply device has not been abnormal before starting to supply power, the sampling unit starts to sample the electric signal at the power supply point of the load and sends it to the judging unit;

[0034] Step 3: the judging unit compares the received electric signal with a given threshold value to judge whether the power supply device is abnormal, and sends the judgment result to the control unit; and

[0035] Step 4: If the result of the judgment is that the power supply device has not failed, the control unit turns on the cutoff switch, and keeps the cutoff switch in the on state until a result of the judgment is received from the judgment unit that the power supply device has failed, and if the result of the judgment is that the power supply device has failed, the control unit turns off the cutoff switch, and restarts the power supply module.

[0036] Effects of the Invention

[0037] According to the present application, it is possible to provide a load protection module that can promptly cut off power supply to a load when a power supply device fails, thereby protecting the load from damage, a power supply device provided with the load protection module, and a load protection method. BRIEF DESCRIPTION OF DRAWINGS

[0038] FIG. 1 is a schematic diagram showing one example of the structure of a conventional non-isolated power supply device.

[0039] FIG. 2 is a schematic diagram showing the structure of a non-isolated power supply device provided with a cutoff switch.

[0040] FIG. 3 is a block diagram for explaining the working principle of the load protection module of the present application.

[0041] FIG. 4 is a schematic diagram showing one example of an electrical signal sampled by a sampling unit included in the load protection module.

[0042] FIG. 5 is a schematic diagram showing the structure of a power supply device including the load protection module according to Embodiment 1 of the present application.

[0043] FIG. 6 is a schematic diagram showing the structure of a power supply device including the load protection module according to Embodiment 2 of the present application.

[0044] FIG. 7 is a flowchart showing the operation of a power supply device provided with the load protection module according to Embodiment 2 of the present application.

[0045] FIG. 8 is a schematic diagram showing the current flow path when the power supply device provided with the load protection module according to Embodiment 2 of the present application initially starts power supply.

[0046] FIG. 9 is a schematic diagram showing the current flow path when the power supply device provided with the load protection module according to Embodiment 2 of the present application normally supplies power.

[0047] Explanation of Reference Signs 1: power supply device; 2, 2A: load protection module; 10: circuit on-off control unit; 20: main power circuit; 30: control unit; 40: sampling unit; 50: determination unit; PM: power module; DM: voltage dividing module; SW0: cut-off switch; SW1: 1st voltage dividing element; SW2: 2nd voltage dividing element; A: load power supply point; Vin: power module voltage; Vout: load voltage (power supply device output voltage); Vth: voltage threshold. DETAILED DESCRIPTION

[0048] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings. In the drawings, the same or corresponding components are denoted by the same reference signs, and overlapping descriptions will be omitted. In addition, each of the embodiments described in the present application is illustrative, and partial substitution or combination of structures can be made between different embodiments.

[0049] Note that the embodiments described below are for the purpose of facilitating understanding of the present application, and are not intended to limit the interpretation of the present application.

[0050] In addition, in the following description, the terms "1st", "2nd", and the like are used only to distinguish one component, parameter, or value from another, and the present application is not limited by these terms. In addition, in the following description, the term "connection" includes not only direct connection, but also indirect connection via other components, and further includes connection by non-direct contact such as electromagnetic field coupling.

[0051] Before the present application is described in detail, a conventional non-isolated power supply device will be briefly described in order to more easily understand the present application.

[0052] FIG. 1 is a schematic view showing one example of the structure of a conventional non-isolated power supply device. In FIG. 1, as one example of a non-isolated power supply device, a power supply device 1 includes a power module PM and a voltage dividing module DM. The voltage dividing module DM includes a 1st voltage dividing element SW1 and a 2nd voltage dividing element SW2 connected in series, constitutes a step-down converter, divides the voltage Vin of the power module PM, and draws a load voltage Vout supplied to a load from a node A between the 1st voltage dividing element SW1 and the 2nd voltage dividing element SW2. In the present specification, the node A is also sometimes referred to as a load power supply point, and the load voltage Vout is also sometimes referred to as a power supply device output voltage.

[0053] The 1st voltage dividing element SW1 and the 2nd voltage dividing element SW2 can be switching elements such as transistors and field effect transistors, but are not limited thereto.

[0054] Although in Fig. 1, one end of the first voltage dividing element SW1 of the voltage dividing module DM is connected to the anode of the power module PM via the inductor Lleak, the load voltage Vout is led out from the load supply point A via the inductor Lo, and the capacitor Cin is connected in parallel to the series circuit of the voltage dividing module DM and the inductor Lleak, the inductor Lleak, the inductor Lo and the capacitor Cin are not necessary constituent elements.

[0055] For the power supply device 1 shown in Fig. 1, if the first voltage dividing element SW1 is short-circuited (abnormality occurs) during the power supply process, the power module voltage Vin will be directly loaded on the load R. Since the power module voltage Vin is usually much higher than the bearable voltage range of the load R, such short-circuit abnormality will cause serious damage to the load R.

[0056] To solve this problem, it can be considered to provide a cut-off switch SW0 in the power supply device 1 as shown in Fig. 2. When such abnormality as the short-circuit of the first voltage dividing element SW1 occurs, by making the cut-off switch SW0 open, the path for the power supply device 1 to supply power to the load R can be cut off, thus avoiding the power module voltage Vin to be directly loaded on the load R, and achieving the protection of the load R. The cut-off switch SW0 can be, for example, a transistor, a field effect transistor or other devices with on-off function.

[0057] However, if the power supply device 1 has already occurred abnormality before use (for example, the first voltage dividing element has been short-circuited before the power supply device is used), or the abnormality occurred during the working process causes the voltage to rise too fast, the protection strength of the scheme of providing the cut-off switch shown in Fig. 2 is not ideal, and the load R still has the risk of being damaged.

[0058] The inventor of the present application is aware of this problem, and thus proposes the present application. Hereinafter, the present application will be described in detail.

[0059] (Embodiment 1)

[0060] Hereinafter, the embodiment 1 of the present application will be described in detail with reference to Figs. 3-5.

[0061] Fig. 3 is a block diagram for explaining the working principle of the load protection module of the present application. As shown in Fig. 3, when the power supply module is working normally, the circuit on-off control unit 10 included in the load protection module makes the power supply path from the power supply module to the load conductive, the voltage Vin of the power supply module is input to the main power circuit 20 via the load protection module of the present application, and the load voltage Vout is led out from the main power circuit 20 to be supplied to the load. Here, as an example of the circuit on-off control unit 10, the cut-off switch SW0 explained above can be cited. The sampling unit 40 included in the load protection module samples the electric signal flowing through the main power circuit 20 and sends the sampled electric signal to the judging unit 50. Here, as an example, the electric signal can be a voltage signal. The judging unit 50 compares the received electric signal (e.g., voltage signal) with a given threshold value and judges whether the power supply device is abnormal (e.g., whether the main power circuit is short-circuited) based on the comparison result. Here, the given threshold value can be a value designed in advance according to the specifications of the specific power supply device.

[0062] Fig. 4 is a schematic diagram showing an example of the electric signal sampled by the sampling unit included in the load protection module.

[0063] In Fig. 4, as an example, the electric signal is a voltage signal V. Referring to Fig. 4, the sampled voltage signal V is a periodic square wave signal, during T1 to T4, the power supply device is in a normal working state, i.e., no abnormality such as short-circuit of the main power circuit 20 occurs, the electric signal is a normal square wave, and the voltage signal is higher than the given threshold value Vth shown in the figure. In this case, the judging unit judges that the power supply device is not abnormal, and the control unit receiving this judgment result makes the circuit on-off control unit 10 remain in the conductive state.

[0064] However, thereafter the power supply device becomes abnormal, the voltage signal starts to drop from time T5, and when the voltage signal drops to be lower than or equal to the given threshold value Vth shown in the figure, the judging unit 50 judges that the power supply device is abnormal and sends this judgment result to the control unit 30. The control unit 30 receiving the judgment result that the power supply device is abnormal makes the circuit on-off control unit 10 break, and cuts off the power supply path from the power supply module to the load in time, thereby avoiding damage to the load.

[0065] Here, the sampled voltage signal shown in Fig. 4 is only an example, and the present application is not limited thereto. Depending on the circuit structure of the sampling unit 40 and the judging unit 50, it can also be that the judging unit judges that the power supply device is abnormal when the sampled voltage signal is higher than or equal to the given threshold value. Details thereof are omitted.

[0066] As one example of the determination unit 50, the above-described comparison and determination can be performed based on a DSP (Digital Signal Processing) technique, and detailed description thereof is omitted here.

[0067] Fig. 5 is a schematic diagram showing the structure of a power supply device including a load protection module according to Embodiment 1 of the present application.

[0068] In Fig. 5, the on-off switch SW0 corresponds to the circuit on-off control unit 10 shown in Fig. 3, and a voltage dividing module DM including a series connection of a first voltage dividing element SW1 and a second voltage dividing element SW2 corresponds to the main power circuit 20 shown in Fig. 3. The voltage dividing module DM supplies power to a load R from a load supply point A, i.e., the power supply device 1 draws a load voltage (i.e., a power supply device output voltage) Vout supplied to the load R from the load supply point A. The sampling unit 40 can sample a voltage signal at the load supply point A. As one example of an abnormality occurring in the power supply device 1, a short circuit of the first voltage dividing element SW1 can be cited.

[0069] In addition, the first voltage dividing element SW1 and the second voltage dividing element SW2 can be switching elements such as transistors and field effect transistors, but are not limited thereto.

[0070] In addition, although a parallel circuit of a capacitor and an inductor is shown as the load R in Fig. 5, this is merely an example, and the load R according to the present application is not limited thereto, and can be any electric device or the like.

[0071] In addition, the capacitor Cin, the inductor Lleak, and the inductor Lo shown in Fig. 5 are not essential components according to the present application.

[0072] According to Embodiment 1, the power supply path from the power supply device to the load can be promptly cut off when an abnormality occurs in the power supply device, thereby preventing the load from being damaged by excessive voltage. Therefore, according to Embodiment 1, even when the voltage rises too quickly when an abnormality occurs, the load can be effectively protected.

[0073] (Embodiment 2)

[0074] Hereinafter, with reference to Figs. 6 to 9, Embodiment 2 of the present application will be described in detail.

[0075] Fig. 6 is a schematic diagram showing the structure of a power supply device including a load protection module according to Embodiment 2 of the present application.

[0076] As shown in FIG. 6, the load protection module 2A of the embodiment 2 is different from the load protection module 2 of the embodiment 1 in that it further has the resistor R90. One end of the resistor R90 is connected to the line between the power module PM and the cut-off switch SW0, and the other end is connected to the line between the cut-off switch SW0 and the voltage division module DM via the control unit 30. That is, the resistor R90 and the control unit 30 constitute a bypass path of the current with respect to the cut-off switch SW0.

[0077] Hereinafter, the differences between the embodiment 2 and the embodiment 1 will be mainly described, and the structures of the embodiment 2 that are the same as those of the embodiment 1 will be omitted.

[0078] FIG. 7 is a flowchart showing the operation of the power supply device provided with the load protection module related to the embodiment 2 of the present application. That is, the load protection module and the power supply device related to the embodiment 2 of the present application realize the protection of the load according to the steps shown in FIG. 7.

[0079] Specifically, as shown in FIG. 7, when the power module PM of the power supply device 1 initially starts to supply power to the load, the cut-off switch SW0 is in the off state, the sampling unit 40 does not sample, and the current flows to the voltage division module DM via the resistor R90 and the control unit 30 (see steps Sll and S12 in FIG. 7). In FIG. 8, the current flow direction at this time is shown by arrows.

[0080] If an abnormality has occurred in the power supply device 1 before use (i.e., before the load R is connected and the power supply to the load R is started), the current at this time directly causes the resistor R90 to burn out, and the power supply device 1 does not supply power to the load R (see steps S13 and S14 in FIG. 7). If no abnormality has occurred in the power supply device 1 before use, i.e., before the power supply is started, the current flows as shown by the arrows in FIG. 8, the sampling unit 40 starts to sample the electric signal at the power supply point A of the load and sends it to the judging unit 50 (see steps S13 and S15 in FIG. 7). Since no abnormality has occurred, the control unit 30 turns on the cut-off switch SW0, and the current direction becomes as shown by the arrows in FIG. 9, i.e., the current at this time no longer flows to the voltage division module via the bypass path including the resistor R90 and the control unit 30, but flows to the voltage division module via the cut-off switch SW0. Thereafter, the sampling unit 40 continuously samples and sends the sampling results to the judging unit 50.

[0081] The judging unit 50 compares the received electric signal with a given threshold value, thereby judging whether an abnormality has occurred in the power supply device (see step S16 in FIG. 7), and sends the judgment result to the control unit 30.

[0082] If the result of the judgment is that the power supply device has not failed, the control unit 30 turns on the cutoff switch SW0 and keeps the cutoff switch SW0 in the on state until the control unit 30 receives the result of the judgment that the power supply device has failed from the judgment unit (see step S17 in FIG. 7). If the result of the judgment is that the power supply device has failed, the control unit 30 turns off the cutoff switch SW0 (see step S18 in FIG. 7) and restarts the power supply module PM (see step S19 in FIG. 7).

[0083] In addition, in the present application, when the power supply module PM is restarted, step S11 in FIG. 7 is performed again.

[0084] According to Embodiment 2, as in Embodiment 1, the power supply path from the power supply device to the load is promptly cut off when the power supply device fails, and thus even if the voltage rises too quickly when the power supply device fails, the load can be protected from being damaged by the excessive voltage, and the load can be effectively protected.

[0085] Furthermore, according to Embodiment 2, even if the power supply device has failed before use, the load can be effectively protected.

[0086] Furthermore, according to Embodiment 2, when the power supply device is monitored to have failed during power supply from the power supply device, and the cutoff switch is turned off, the power supply module is restarted and power supply is restarted. If the power supply device has actually failed, after the power supply module is restarted, the situation is equivalent to the situation in step S13 in FIG. 7 in which the voltage module has failed before power supply is started, and thus the resistor R90 is directly burned out. At this time, it can be determined that the power supply device has actually failed. If the previously monitored failure is a false trigger, after the power supply module is restarted, the power supply device operates normally in the order of steps S11 to S13 and S15 to S17 in FIG. 7. Thus, according to Embodiment 2, it is also possible to avoid a situation in which the power supply device is erroneously determined to have failed due to a false trigger.

[0087] (Embodiment 3)

[0088] In Embodiments 1 and 2, the voltage signal at the load power supply point A is sampled by the sampling unit 40, and the sampled voltage signal is compared with the threshold value by the judgment unit 50, and thus it is determined whether the power supply device has failed. In contrast, in Embodiment 3, a method of sampling the current signal at the load power supply point A is shown.

[0089] When the current signal at the power supply point A is sampled, if an abnormality such as short circuit of the first voltage dividing element SW1 occurs, the current flowing through the first voltage dividing element SW1 will change. In the case where the line impedance does not change, the difference in current before and after the abnormality occurs can be equivalent to the difference in voltage. Therefore, in this case, whether the voltage change exceeds the design threshold can also be determined by DSP technology or the like, and whether the power supply device has an abnormality such as short circuit can be determined, and the cut-off switch SW0 is opened by the control unit 30 when it is determined that the power supply device has an abnormality. The conversion of the difference in current to the difference in voltage can be performed by using known technology, and detailed description is omitted here.

[0090] According to Embodiment 3, as well as Embodiments 1 and 2, even if the power supply device has an abnormality before use or the voltage rises too fast (the current changes too fast) when an abnormality occurs, the load can be effectively protected.

[0091] In addition, although the load protection module of the present application is described in the above embodiments by taking a non-isolated power supply device as an example, the load protection module of the present application can also be applied to an isolated power supply device. Moreover, the present application is not limited thereto, and as long as the configuration of the load protection module in the power supply device conforms to the connection relationship described in Embodiments 1 to 3, the same effects as Embodiments 1 to 3 can be achieved.

[0092] (Embodiment 4)

[0093] The present application also provides a load protection method for protecting the load when an abnormality occurs in the power supply device, by using the load protection module according to Embodiment 2 of the present application.

[0094] Hereinafter, with reference to FIG. 7, the load protection method according to Embodiment 4 of the present application will be described.

[0095] The load protection method of the present application can include the following steps:

[0096] Step 1: the power module PM of the power supply device 1 starts to supply power, at this time, the cut-off switch SW0 is in the open state, the sampling unit 40 does not sample, and the current flows through the resistor R90 and the control unit 30 to the voltage dividing module DM (equivalent to step S11, step S12 in FIG. 7);

[0097] Step 2: If the abnormality has occurred before the power supply device 1 starts to supply power, the current at this time causes the resistance R90 to burn out, and the power supply device does not supply power to the load (corresponding to steps S13, S14 in FIG. 7), and if the abnormality has not occurred before the power supply device 1 starts to supply power, the sampling unit 40 starts to sample the electric signal at the power supply point A of the load and sends it to the judging unit 50 (corresponding to steps S13, S15 in FIG. 7);

[0098] Step 3: The judging unit 50 compares the received electric signal with the given threshold value, thereby judging whether the abnormality has occurred in the power supply device, and sends the judgment result to the control unit 30 (corresponding to step S16 in FIG. 7); and

[0099] Step 4: If the judgment result is that the abnormality has not occurred in the power supply device, the control unit 30 causes the cut-off switch SW0 to be turned on, and keeps the cut-off switch SW0 in the on state until the judgment result that the abnormality has occurred in the power supply device 1 is received from the judging unit 50 (corresponding to step S17 in FIG. 7), and if the judgment result is that the abnormality has occurred in the power supply device 1, the control unit 30 causes the cut-off switch SW0 to be turned off, and restarts the power module PM (corresponding to steps S18, S19 in FIG. 7).

[0100] When the power module is restarted, the load protection method according to the present application jumps to step 1 (more specifically, to step S11 in FIG. 7).

[0101] The load protection method according to Embodiment 4 of the present application can achieve the same effects as Embodiment 2.

[0102] The load protection module and the power supply device having the same according to the present application have been described in detail above in connection with the preferred embodiments, but the present application is not limited thereto. Those skilled in the art can make various modifications, replacements, and changes to the present application without departing from the gist of the present application. Other embodiments achieved by combining any of the constituent elements in the above-described embodiments, embodiments obtained by making various modifications to the above-described embodiments without departing from the gist of the present application, and various devices having the load protection module and the power supply device according to the present application built therein are also included in the present application.

Claims

1. A load protection module provided in a power supply device having a power supply module and a voltage dividing module, the voltage dividing module supplying power to a load from a load power supply point, wherein the load protection module comprises: a cut-off switch connected between the power supply module and the voltage dividing module; a sampling unit that samples an electrical signal at the load power supply point and sends the electrical signal to a determination unit; the determination unit that determines whether the power supply device is abnormal based on the electrical signal received from the sampling unit and sends the determination result to a control unit; and the control unit that controls the on and off of the cut-off switch based on the determination result received from the determination unit.

2. The load protection module according to claim 1, further comprising: a resistor having one end connected to a line between the power supply module and the cut-off switch and the other end connected to a line between the cut-off switch and the voltage dividing module via the control unit.

3. The load protection module according to claim 2, wherein when the power supply device initially starts to supply power, the cut-off switch is in an off state, and current flows from the power supply module to the voltage dividing module via the resistor and the control unit, if the power supply device has been abnormal when the power supply device initially starts to supply power, the resistor is burned out, if the power supply device is not abnormal when the power supply device initially starts to supply power, the resistor is not burned out, the sampling unit determines that the power supply device is not abnormal based on the sampled electrical signal, and the control unit turns on the cut-off switch, and current flows to the voltage dividing module via the cut-off switch.

4. The load protection module according to any one of claims 1 to 3, wherein if the sampling unit determines that the power supply device is abnormal based on the sampled electrical signal, the control unit turns off the cut-off switch.

5. The load protection module according to claim 4, wherein after turning off the cut-off switch, the power supply module is restarted to re-supply power to the power supply device.

6. The load protection module according to any one of claims 1 to 5, wherein the electrical signal is a voltage signal at the load power supply point.

7. The load protection module according to claim 6, wherein when the voltage signal is lower than or equal to a given threshold value, the sampling unit determines that the power supply device is abnormal.

8. The load protection module according to claim 6, wherein when the voltage signal is higher than a given threshold value, the sampling unit determines that the power supply device is not abnormal.

9. The load protection module according to any one of claims 1 to 5, wherein the electrical signal is a current signal at the load power supply point.

10. The load protection module according to any one of claims 1 to 9, wherein the voltage dividing module comprises a first voltage dividing element and a second voltage dividing element connected in series, the first voltage dividing element is closer to the cut-off switch than the second voltage dividing element, and the load power supply point is located between the first voltage dividing element and the second voltage dividing element.

11. The load protection module according to claim 10, wherein the abnormality is a short circuit of the first voltage dividing element. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 12. A power supply device comprising: the load protection module according to any one of claims 1 to 11.

13. The power supply device according to claim 12, wherein the power supply device is a non-isolated power supply device.

14. A load protection method implemented by the load protection module according to claim 2, wherein the load protection method comprises: Step 1: starting power supply of the power supply device, at this time, the cut-off switch is in an open state, the sampling unit does not sample, and the current flows to the voltage dividing module through the resistor and the control unit; Step 2: if an abnormality occurs in the power supply device before starting power supply, the current causes the resistor to burn out, the power supply device does not supply power to the load, if no abnormality occurs in the power supply device before starting power supply, the sampling unit starts sampling the electrical signal at the power supply point of the load and sends it to the judgment unit; Step 3: the judgment unit compares the received electrical signal with a given threshold value to determine whether an abnormality occurs in the power supply device and sends the determination result to the control unit; and Step 4: if the determination result is that no abnormality occurs in the power supply device, the control unit turns on the cut-off switch and keeps the cut-off switch in the on state until the determination result that an abnormality occurs in the power supply device is received from the judgment unit, if the determination result is that an abnormality occurs in the power supply device, the control unit turns off the cut-off switch and restarts the power supply module.

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