Power supply control circuit and security inspection equipment

Abstract

The utility model provides a power supply control circuit and security inspection equipment, and relates to the technical field of security inspection. The power supply control circuit comprises a first power supply module; one of the first power supply module and the second power supply module comprises an uninterruptible power supply unit, and the other one of the first power supply module and the second power supply module comprises a commercial power supply unit; the power supply switching module comprises a first end, a second end and a third end, the first end is connected with the first power supply module, the second end is connected with the second power supply module, and the third end is connected with a target device; the power supply switching module is configured to disconnect the first end and the third end when the power supply of the first end is abnormal, and connect the second end and the third end within a first preset time; when power supply of the first end returns to normal, the second end and the third end are disconnected, the first end and the third end are connected within a second preset time, and the first preset time and the second preset time are configured in the mode that when switching operation is executed, the target device does not lose power.

Description

Technical Field

[0001] The utility model relates to the technical field of security inspection, in particular to a power supply control circuit and security inspection equipment. Background Art

[0002] Security inspection equipment is a system used for baggage and cargo inspection in the security inspection field. It needs to use transmission equipment to transfer baggage and cargo into a closed scanning space, cooperate to complete the scanning, and then send the cargo out. Security inspection equipment needs to quickly process a large number of baggage and cargo, and has high requirements for power protection.

[0003] In one example, the security equipment (or components in the security equipment) is powered by an uninterruptible power supply. When the mains power supply is normal, the uninterruptible power supply stabilizes the mains power supply and supplies it to the security equipment. When the mains power supply is abnormal, the uninterruptible power supply supplies power to the security equipment through an internal battery module. However, the uninterruptible power supply itself has a certain risk of failure. Once the uninterruptible power supply is abnormal, the security equipment will lose power, which will cause data loss and system crashes, and even hardware damage, which will lead to problems such as stranded passengers and flight delays, with serious consequences. Utility Model Content

[0004] In view of the above problems, the utility model provides a power control circuit and a security inspection device.

[0005] According to a first aspect of the utility model, a power supply control circuit is provided, comprising:

[0006] A first power supply module;

[0007] A second power supply module, one of the first power supply module and the second power supply module comprises an uninterruptible power supply unit, and the other comprises a mains power supply unit;

[0008] A power switching module, the power switching module comprising a first end, a second end and a third end, the first end being connected to the first power supply module, the second end being connected to the second power supply module, and the third end being connected to the target device;

[0009] The power switching module is configured to: perform a first switching operation when the power supply of the first end is abnormal, and perform a second switching operation when the power supply of the first end returns to normal;

[0010] The first switching operation includes: disconnecting the first end from the third end, and connecting the second end to the third end within a first preset time;

[0011] The second switching operation includes: disconnecting the second end from the third end, and connecting the first end to the third end within a second preset time;

[0012] The first preset time and the second preset time are configured such that when any operation of the first switching operation and the second switching operation is performed, the target device will not lose power.

[0013] In some specific embodiments, the first power supply module includes an uninterruptible power supply unit, the second power supply module includes a mains power supply unit, the uninterruptible power supply unit is connected to the first power supply, and the power supply control circuit further includes a first isolation module;

[0014] The first isolation module is connected between the first end and the uninterruptible power supply unit, and between the uninterruptible power supply unit and the first power supply;

[0015] The first isolation module is configured to: isolate the first end from the uninterruptible power supply unit in response to a first operation of a user, and, after isolating the first end from the uninterruptible power supply unit, isolate the uninterruptible power supply unit from the first power source;

[0016] The power switching module is specifically configured to: perform the first switching operation when the first end is isolated from the uninterruptible power supply unit, and perform the second switching operation when the first end is connected to the uninterruptible power supply unit.

[0017] In some specific embodiments, the first isolation module includes: a first isolator and a second isolator, the first isolator is connected between the first end and the uninterruptible power supply unit, and the second isolator is connected between the uninterruptible power supply unit and the first power supply;

[0018] The first isolation module further includes: a first protector, wherein the first protector is integrated with the first isolator;

[0019] The first protector is configured to control the first isolator to isolate the first end from the third end when the first end is conductively connected to the third end and the second end is conductively connected to the third end.

[0020] In some specific embodiments, the first isolation module further includes: a second protector, the second protector being integrated with the second isolator;

[0021] The second protector is configured to control the second isolator to isolate the uninterruptible power supply unit from the first power supply when a preset fault occurs in the uninterruptible power supply unit, wherein the preset fault includes at least one of an overload fault and a short circuit fault.

[0022] In some specific embodiments, the power control circuit further includes a third isolator and a third protector, the third isolator is connected between the second end and the mains power supply unit, and the third protector is integrated with the third isolator;

[0023] The third protector is configured to control the third isolator to isolate the second end from the third end when the second end is conductively connected to the third end and the first end is conductively connected to the third end.

[0024] In some specific embodiments, the first isolation module includes: a first isolator and a second isolator, the first isolator is connected between the first end and the uninterruptible power supply unit, and the second isolator is connected between the uninterruptible power supply unit and the first power supply;

[0025] The first isolation module further includes: a first protector, the first protector being integrated with the first isolator;

[0026] The first protector is configured to: when the first end is conductively connected to the third end, and the second end is conductively connected to the third end, control the first isolator to isolate the first end from the third end;

[0027] The third protector has a different response time from the first protector.

[0028] In some specific embodiments, the uninterruptible power supply unit includes a main power supply subunit, a bypass power supply subunit and a control subunit;

[0029] The main power supply subunit is connected between the first power source and the first end, the bypass power supply subunit is connected to the first end, and the control subunit is connected to the main power supply subunit and the bypass power supply subunit;

[0030] The control subunit is configured to: when one of the first end and the second end is connected to the third end, the main power supply subunit supplies power to the first end and the bypass power supply subunit is disconnected from the first end; when both the first end and the second end are connected to the third end, the main power supply subunit is disconnected from the first end and the bypass power supply subunit supplies power to the first end;

[0031] Wherein, the first power supply module and the bypass power supply sub-unit are connected to the same power supply.

[0032] In some specific embodiments, the power switching module includes: an AC contactor, the AC contactor including a first electromagnetic coil, a normally open switch, and a normally closed switch;

[0033] The normally open switch is connected between the first end and the third end, the first electromagnetic coil is connected between the first end and the normally open switch, and the normally closed switch is connected between the second end and the third end.

[0034] In some specific embodiments, the power control circuit further includes a control module connected between the third terminal and the target device;

[0035] The control module is configured to: send a first shutdown signal to the target device in response to a first instruction;

[0036] After the first shutdown signal is sent for a first preset time, disconnecting the third end from the target device;

[0037] The first shutdown signal is configured to cause the target device to perform a first shutdown operation.

[0038] In some specific embodiments, the first power supply module is connected to a first power supply, the second power supply module is connected to a second power supply, the uninterruptible power supply unit includes an energy storage module, and the control module is further configured as follows:

[0039] When both the first power source and the second power source lose power and the remaining power of the energy storage module is lower than a preset power, sending the first shutdown signal to the target device;

[0040] After the first shutdown signal is sent for a second preset time, the third end is disconnected from the target device.

[0041] In some specific embodiments, the control module is also connected to the uninterruptible power supply unit, and the control module is further configured as follows:

[0042] After disconnecting the third terminal from the target device, sending a second shutdown signal to the uninterruptible power supply unit;

[0043] The second shutdown signal is configured to cause the uninterruptible power supply unit to perform a second shutdown operation.

[0044] In some specific embodiments, any of the first preset time and the second preset time is less than 30 ms.

[0045] In some specific embodiments, the power switching module satisfies at least one of the following conditions:

[0046] The lower limit of the current allowed to pass through the power switching module is greater than or equal to 20A;

[0047] The upper limit of the operating temperature range of the power switching module is greater than or equal to 50° C.;

[0048] The upper limit of the working humidity of the power switching module is greater than or equal to 80%.

[0049] A second aspect of the utility model provides a security inspection device, which includes the above-mentioned power control circuit.

[0050] One or more of the above embodiments have the following advantages or beneficial effects:

[0051] In the embodiment of the utility model, a double insurance design of power supply is formed by an uninterruptible power supply unit and a power switching module, which greatly improves the reliability of power supply. In addition, the switching between the first power supply module and the second power supply module is fully automatic, and the whole process does not require manual intervention, and the switching speed is fast, thereby ensuring that the target device will not lose power in this scenario, thereby enabling the security inspection equipment to continue to work normally, greatly improving the ability of the security inspection equipment to cope with sudden power failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The above contents and other purposes, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0053] Figure 1 One of the schematic diagrams of the power supply control circuit in the embodiment of the utility model is schematically shown;

[0054] Figure 2 The second schematic diagram of the power supply control circuit in the embodiment of the utility model is schematically shown;

[0055] Figure 3 The third schematic diagram schematically shows the power control circuit in the embodiment of the utility model;

[0056] Figure 4 A schematic diagram of an uninterruptible power supply unit in an embodiment of the utility model is schematically shown;

[0057] Figure 5 A fourth schematic diagram of a power supply control circuit in an embodiment of the present utility model is schematically shown;

[0058] Figure 6 The schematic diagram of the control module in the embodiment of the utility model is schematically shown. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution of the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the described embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the utility model.

[0060] It should be noted that in the drawings, the size and relative size of the elements may be exaggerated for the purpose of clarity and / or description. Thus, the size and relative size of each element are not necessarily limited to the size and relative size shown in the drawings. In the specification and drawings, the same or similar reference numerals indicate the same or similar parts.

[0061] When an element is described as being "on" another element, "connected to" another element, or "bound to" another element, the element may be directly on the other element, directly connected to the other element, or directly bound to the other element, or there may be an intermediate element. However, when an element is described as being "directly on" another element, "directly connected to" another element, or "directly bound to" another element, there is no intermediate element. Other terms and / or expressions used to describe the relationship between elements should be interpreted in a similar manner, for example, "between..." versus "directly between...", "adjacent" versus "directly adjacent" or "on..." versus "directly on...", etc. In addition, the term "connection" may refer to a physical connection, an electrical connection, a communication connection, and / or a fluid connection. In addition, the X-axis, the Y-axis, and the Z-axis are not limited to the three axes of a rectangular coordinate system, and may be interpreted in a broader sense. For example, the X-axis, the Y-axis, and the Z-axis may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. For the purpose of the present invention, "at least one of X, Y, and Z" and "at least one selected from the group consisting of X, Y, and Z" may be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z such as XYZ, XYY, YZ, and ZZ. As used herein, the term "and / or" includes any and all combinations of one or more of the listed associated items.

[0062] It should be noted that, although the terms "first", "second", etc. may be used herein to describe various parts, components, elements, regions, layers and / or parts, these parts, components, elements, regions, layers and / or parts should not be limited by these terms. Instead, these terms are used to distinguish one part, component, element, region, layer and / or part from another. Thus, for example, the first part, first member, first element, first region, first layer and / or first part discussed below may be referred to as the second part, second member, second element, second region, second layer and / or second part without departing from the teachings of the present invention.

[0063] For ease of description, spatial relational terms, such as "upper", "lower", "left", "right", etc., may be used herein to describe the relationship of one element or feature to another element or feature as shown in the figure. It should be understood that the spatial relational terms are intended to cover other different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the figure is turned upside down, elements described as "below" or "beneath" other elements or features will be oriented "above" or "above" the other elements or features.

[0064] As used herein, the terms "substantially," "about," "approximately," "roughly," and other similar terms are used as terms of approximation rather than as terms of degree, and they are intended to account for the inherent deviations in measured or calculated values ​​that would be recognized by one of ordinary skill in the art. Taking into account factors such as process fluctuations, measurement problems, and errors associated with the measurement of a particular quantity (i.e., limitations of the measurement system), "about" or "approximately" as used herein include the stated value and mean that the particular value is within an acceptable range of deviation as determined by one of ordinary skill in the art. For example, "approximately" can mean within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the stated value.

[0065] An embodiment of the utility model provides a power control circuit, comprising: a first power supply module, a second power supply module and a power switching module. One of the first power supply module and the second power supply module comprises an uninterruptible power supply unit, and the other comprises a mains power supply unit. The power switching module comprises a first end, a second end and a third end, the first end is connected to the first power supply module, the second end is connected to the second power supply module, and the third end is connected to the target device.

[0066] The power switching module is configured to: perform a first switching operation when the power supply of the first end is abnormal, and perform a second switching operation when the power supply of the first end returns to normal. The first switching operation includes: disconnecting the first end from the third end, and connecting the second end to the third end within a first preset time. The second switching operation includes: disconnecting the second end from the third end, and connecting the first end to the third end within a second preset time. The first preset time and the second preset time are configured such that when any of the first switching operation and the second switching operation is performed, the target device will not lose power.

[0067] In the embodiment of the utility model, a double insurance design of power supply is formed by an uninterruptible power supply unit and a power switching module, which greatly improves the reliability of power supply. In addition, the switching between the first power supply module and the second power supply module is fully automatic, and the whole process does not require manual intervention, and the switching speed is fast, thereby ensuring that the target device will not lose power in this scenario, thereby enabling the security inspection equipment to continue to work normally, greatly improving the ability of the security inspection equipment to cope with sudden power failures.

[0068] Combine the following Figures 1 to 6 The power control circuit of the embodiment of the utility model is described in detail.

[0069] Figure 1 One of the schematic diagrams of the power supply control circuit in the embodiment of the utility model is schematically shown.

[0070] Reference Figure 1 In an embodiment of the present utility model, a power control circuit is provided, and the power control circuit includes: a first power supply module 110, a second power supply module 120 and a power switching module 130. One of the first power supply module 110 and the second power supply module 120 includes an uninterruptible power supply unit (UPS), and the other includes a mains power supply unit.

[0071] Exemplarily, the first power supply module 110 is an uninterruptible power supply unit, and the second power supply module 120 is a mains power supply unit. Alternatively, the first power supply module 110 is a mains power supply unit, and the second power supply module 120 is an uninterruptible power supply unit. Among them, the first power supply module 110 is a main power supply module, and the second power supply module 120 is a backup power supply module. For the sake of clarity, unless otherwise specified, the following description will take the first power supply module 110 as an uninterruptible power supply unit and the second power supply module 120 as a mains power supply unit as an example, that is, in the following description, the uninterruptible power supply unit is the main power supply module, and the mains power supply unit is the backup power supply module.

[0072] The power switching module 130 includes a first end 131, a second end 132 and a third end 133, wherein the first end 131 is connected to the first power supply module 110, the second end 132 is connected to the second power supply module 120, and the third end 133 is connected to the target device 140. In an embodiment of the present utility model, the power control circuit is applied to security inspection equipment, for example, the target device 140 may refer to security inspection equipment or some equipment or devices in the security inspection equipment that have high power supply requirements, such as a server.

[0073] The power switching module 130 is configured to: perform a first switching operation when the power supply of the first end 131 is abnormal, and perform a second switching operation when the power supply of the first end 131 returns to normal. The first switching operation includes: disconnecting the first end 131 from the third end 133, and connecting the second end 132 to the third end 133 within a first preset time. The second switching operation includes: disconnecting the second end 132 from the third end 133, and connecting the first end 131 to the third end 133 within a second preset time. The first preset time and the second preset time are configured such that: when performing any of the first switching operation and the second switching operation, the target device 140 will not lose power.

[0074] In an embodiment of the utility model, the first power supply module 110 (e.g., an uninterruptible power supply unit) may be unable to normally supply power to the first end 131 due to a fault or other reasons, such as insufficient power supply or even power failure, which may cause the target device 140 to lose power, and then cause the entire security inspection equipment to fail. When this happens, that is, when the power supply of the first end 131 is abnormal, the power switching module 130 can respond immediately and switch the power supply module to the second power supply module 120, that is, perform the first switching operation. In the first switching operation, the power switching module 130 first disconnects the first end 131 from the third end 133, and then connects the second end 132 to the third end 133 within a first preset time. At this time, the second power supply module 120 (e.g., a mains power supply unit) will replace the first power supply module 110 to supply power to the target device 140.

[0075] Optionally, the first preset time can be less than or equal to 30ms, that is, the time interval from the disconnection of the first end 131 and the third end 133 to the connection of the second end 132 and the third end 133 does not exceed 30ms, and the switching time is extremely short. In this way, when the first switching operation is performed, it can be ensured that the target device 140 will not lose power, so that when the power supply of the first power supply module 110 is abnormal, the target device 140 can still operate smoothly and will not cause the entire security inspection equipment to fail.

[0076] In the embodiment of the present utility model, after the first power supply module 110 is restored to normal by means of maintenance or the like, the first power supply module 110 supplies power to the first end 131 again, that is, the power supply of the first end 131 is restored to normal, at this time, the power switching module 130 can respond immediately and switch the power supply module back to the first power supply module 110, that is, perform the second switching operation. In the second switching operation, the power switching module 130 first disconnects the second end 132 from the third end 133, and then connects the first end 131 to the third end 133 within the second preset time, at this time, the first power supply module 110 (for example, an uninterruptible power supply unit) will be restored to supply power to the target device 140.

[0077] Optionally, the second preset time can be less than or equal to 30ms, that is, the time interval from the disconnection of the second end 132 and the third end 133 to the connection of the first end 131 and the third end 133 does not exceed 30ms, and the switching back time is extremely short. In this way, when executing the second switching operation, it can also be ensured that the target device 140 will not lose power, so that when the first power supply module 110 resumes normal power supply, the target device 140 can also operate smoothly.

[0078] Optionally, the first power supply module 110 and the second power supply module 120 are AC power supply modules, and the power switching module 130 may include an AC contactor, wherein the AC contactor includes an electromagnetic coil and two interlocking switches, wherein the interlocking of the two switches is controlled by the electromagnetic coil. Among the two switches, one is connected between the first end 131 and the third end 133, and the other is connected between the second end 132 and the third end 133. The first preset time and the second preset time can be configured by the response time of the AC contactor, for example, the first preset time and the second preset time are positively correlated with the response time of the AC contactor, that is, the shorter the response time of the AC contactor, the shorter the first preset time and the second preset time.

[0079] When the first power supply module 110 is a mains power supply unit, that is, when the mains power supply unit is used as the main power supply module, the second power supply module 120 can be an additional uninterruptible power supply unit or an existing uninterruptible power supply unit in the reused security inspection equipment. In the embodiment of the utility model, an additional power switching module 130 and a power supply module are introduced, which is equivalent to adding a first layer of power supply insurance on the basis of the mains power supply unit as the main power supply module. Once an abnormality occurs in the mains power supply unit, the power switching module 130 can automatically switch to the uninterruptible power supply unit, and the uninterruptible power supply unit supplies power to the target device 140. The uninterruptible power supply unit can provide a strong power supply abnormality response capability, thereby forming a second layer of power supply insurance, thereby forming a double insurance for power supply. For example, the target device 140 is powered by the first power supply module of the uninterruptible power supply unit. When the first power supply module is abnormal, the target device 140 can also be powered by the energy storage module. Even when the energy storage module is abnormal, the target device 140 can be powered by the bypass subunit, thereby ensuring that the target device 140 can always be effectively powered when the mains power supply unit is abnormal. The specific structure of the uninterruptible power supply unit will be described in detail below and will not be described here.

[0080] When the first power supply module 110 is an uninterruptible power supply unit, that is, when the uninterruptible power supply unit is used as the main power supply module, the second power supply module 120 can be an additionally introduced mains power supply unit or a mains power supply unit that has been connected to the multiplexed security inspection equipment. Although the uninterruptible power supply unit can provide a strong power supply anomaly response capability, compared with the mains power supply unit, the uninterruptible power supply unit itself also has a risk of failure. In an embodiment of the utility model, an additional power switching module 130 and a power supply module are introduced, which is equivalent to adding a second layer of power supply insurance on the basis of the uninterruptible power supply unit as the main power supply module (which itself can serve as the first layer of power supply insurance), thereby forming a double insurance for power supply. Once an abnormality occurs in the uninterruptible power supply unit, the power switching module 130 can automatically switch to the mains power supply unit, and the mains power supply unit supplies power to the target device 140, thereby ensuring that when the uninterruptible power supply unit is abnormal, the target device 140 can always be effectively powered.

[0081] In this way, whether the mains power supply unit is used as the first power supply module 110 (i.e., the main power supply module) or the uninterruptible power supply unit is used as the first power supply module 110, the embodiment of the utility model only needs to add a power switching module 130 and a second power supply module 120 on the basis of the existing power supply circuit, so as to form a double insurance design for power supply, which greatly improves the reliability of power supply. In addition, the switching between the first power supply module 110 and the second power supply module 120 is fully automatic, and the whole process does not require manual intervention, and the switching speed is fast, thereby ensuring that the target device 140 will not lose power in this scenario, thereby enabling the security inspection equipment to continue to work normally, which greatly improves the ability of the security inspection equipment to cope with sudden power failures.

[0082] Combine the following Figures 2 to 6 The power control circuit of the embodiment of the utility model is further described.

[0083] Figure 2 The second schematic diagram of the power supply control circuit in the embodiment of the utility model is schematically shown.

[0084] Reference Figure 2 In some specific embodiments, the first power supply module 110 includes an uninterruptible power supply unit 111, and the second power supply module 120 includes a mains power supply unit 121. The uninterruptible power supply unit 111 is connected to the first power supply V1, and the mains power supply unit 121 is connected to the second power supply V2. Optionally, the first power supply V1 is the same as the second power supply V2.

[0085] The power control circuit further includes a first isolation module 160. The first isolation module 160 is connected between the first terminal 131 and the uninterruptible power supply unit 111, and between the uninterruptible power supply unit 111 and the first power supply V1. The first isolation module 160 is configured to: in response to a first operation of a user, isolate the first terminal 131 from the uninterruptible power supply unit 111, and, after isolating the first terminal 131 from the uninterruptible power supply unit 111, isolate the uninterruptible power supply unit 111 from the first power supply V1.

[0086] In an embodiment of the utility model, the first isolation module 160 may include at least two isolators (e.g., a first isolator 161 and a second isolator 162), one of which is connected between the first end 131 and the uninterruptible power supply unit 111, and the other is connected between the uninterruptible power supply unit 111 and the first power supply V1. Exemplarily, the two isolators may be linked, for example, the two isolators may act successively in response to the same operation of the user, thereby first isolating the first end 131 from the uninterruptible power supply unit 111, and then isolating the uninterruptible power supply unit 111 from the first power supply V1. Exemplarily, the two isolators may be operated independently, for example, the user first operates one of the isolators to first isolate the first end 131 from the uninterruptible power supply unit 111, and then operates the other isolator to isolate the uninterruptible power supply unit 111 from the first power supply V1. In this way, the UPS 111 can be isolated from the target device 140 before the UPS 111 is disconnected from the first power source V1, to prevent the output of the UPS 111 from being abnormal and affecting the target device 140.

[0087] In the embodiment of the present utility model, the power switching module 130 is specifically configured to: when the first end 131 is isolated from the uninterruptible power supply unit 111, perform a first switching operation, and when the first end 131 is connected to the uninterruptible power supply unit 111, perform a second switching operation. Specifically, when the first isolation module 160 isolates the first end 131 from the uninterruptible power supply unit 111, the first end 131 will lose power supply, and at this time, the power switching module 130 performs the first switching operation, that is, the power switching module 130 disconnects the connection between the first end 131 and the third end 133, and connects the second end 132 to the third end 133, thereby switching the power supply module of the target device 140 to the second power supply module 120. That is, in the embodiment of the present utility model, through the cooperation of the first isolation module 160 and the power switching module 130, the user can complete the isolation of the power supply circuit of the uninterruptible power supply unit 111 and the target device 140 through one-key operation, and then carry out the maintenance or replacement of the uninterruptible power supply unit 111. Furthermore, during this process, the target device 140 will not lose power, and the entire security inspection equipment can always maintain normal operation.

[0088] In an embodiment of the utility model, when the maintenance or replacement of the uninterruptible power supply unit 111 is completed, the user can perform a second operation, and the first isolation module 160 is further configured to: in response to the user's second operation, connect the first end 131 to the uninterruptible power supply unit 111, and, after connecting the first end 131 to the uninterruptible power supply unit 111, connect the uninterruptible power supply unit 111 to the first power source V1. At this time, the uninterruptible power supply unit 111 starts and starts to supply power. When the uninterruptible power supply unit 111 can supply power stably, the power supply of the first end 131 returns to normal. At this time, the power switching module 130 performs a second switching operation, that is, the power switching module 130 disconnects the connection between the second end 132 and the third end 133, connects the first end 131 to the third end 133, and thus switches the power supply module of the target device 140 back to the uninterruptible power supply unit 111. That is to say, in the embodiment of the present invention, through the cooperation between the first isolation module 160 and the power switching module 130 , the user can restore the power supply of the uninterruptible power supply unit 111 to the target device 140 through one-key operation.

[0089] In the above manner, whether isolating the uninterruptible power supply unit 111 from the target device 140 or restoring the power supply of the uninterruptible power supply unit 111 to the target device 140, the target device 140 will not lose power, and the entire security inspection equipment can always maintain normal operation, thereby improving the user's convenience in maintaining and replacing the uninterruptible power supply unit 111.

[0090] In some specific embodiments, the first isolation module 160 includes: a first isolator 161 and a second isolator 162, the first isolator 161 is connected between the first end 131 and the uninterruptible power supply unit 111, and the second isolator 162 is connected between the uninterruptible power supply unit 111 and the first power supply V1. The first isolation module 160 also includes: a first protector (not shown in the figure), the first protector is integrated with the first isolator 161. The first protector is configured to: when the first end 131 is connected to the third end 133, and the second end 132 is connected to the third end 133, control the first isolator 161 to isolate the first end 131 from the third end 133.

[0091] In the embodiment of the present utility model, the uninterruptible power supply unit 111 adopts AC power supply. Exemplarily, the uninterruptible power supply unit 111 has two output lines, one of which is a neutral line N, and the other is a live line L. The first isolator 161 and the second isolator 162 each include two isolating switches, one of which is connected to the neutral line N, and the other is connected to the live line L.

[0092] In the embodiment of the utility model, the working environment of the security inspection equipment is complex, and the power switching module 130 may fail due to some reasons. One of the situations includes: in the power switching module 130, the linkage between the first end 131 and the second end 132 fails, which causes the first end 131 and the second end 132 to be simultaneously connected to the third end 133. At this time, the first power supply module 110 and the second power supply module 120 will simultaneously supply power to the target device 140, which may cause anomalies such as overload. Therefore, at least on the first isolator 161, a first protector is integrated. When the first end 131 and the second end 132 are simultaneously connected to the third end 133, the first protector can be immediately activated to control the first isolator 161 to cut off the first end 131 and the third end 133, ensuring that at most only one power supply module (that is, the second power supply module 120) supplies power to the target device 140, thereby preventing the target device 140 from being overloaded.

[0093] Optionally, in addition to the above-mentioned overload protection function, the first protector may also have a short circuit protection function, so that when a short circuit occurs in the line where it is located, the first isolator 161 is promptly controlled to cut off the first end 131 and the third end 133 to prevent a short circuit.

[0094] In some specific embodiments, the first isolation module 160 further includes: a second protector, which is integrated with the second isolator 162. The second protector is configured to: when a preset fault occurs in the uninterruptible power supply unit 111, control the second isolator 162 to isolate the uninterruptible power supply unit 111 from the first power supply V1. The preset fault includes at least one of an overload fault and a short circuit fault.

[0095] Optionally, the specifications and functions of the second protector may be the same as those of the first protector, so that overload protection and short circuit protection may be provided between the first power source V1 and the uninterruptible power supply unit 111, thereby improving the reliability of the power control circuit.

[0096] Figure 3 The third schematic diagram of the power supply control circuit in the embodiment of the utility model is schematically shown.

[0097] Reference Figure 3 In some specific embodiments, the power control circuit further includes a third isolator 163 and a third protector, the third isolator 163 is connected between the second end 132 and the mains power supply unit, and the third protector is integrated with the third isolator 163. The third protector is configured to: when the second end 132 is connected to the third end 133, and the first end 131 is connected to the third end 133, control the third isolator 163 to isolate the second end 132 from the third end 133.

[0098] In an embodiment of the utility model, a third protector is integrated on the third isolator 163. When the first end 131 and the second end 132 are simultaneously connected to the third end 133, the first protector and the third protector can compete for action. The one with a faster reaction can first complete the disconnection between the corresponding power supply module and the target device 140, and the one with a slower reaction can no longer act, so that the power supply module on the line can continue to supply power to the target device 140.

[0099] Optionally, in addition to the above-mentioned overload protection function, the third protector may also have a short circuit protection function, so that when a short circuit occurs in the line where it is located, the third isolator 163 is promptly controlled to cut off the second end 132 and the third end 133 to prevent a short circuit.

[0100] In some specific embodiments, the first isolation module 160 includes: a first isolator 161 and a second isolator 162, the first isolator 161 is connected between the first end 131 and the uninterruptible power supply unit 111, and the second isolator 162 is connected between the uninterruptible power supply unit 111 and the first power supply V1. The first isolation module 160 also includes: a first protector, the first protector and the first isolator 161 are integrated. The first protector is configured to: when the first end 131 is connected to the third end 133, and the second end 132 is connected to the third end 133, control the first isolator 161 to isolate the first end 131 from the third end 133. The response time of the third protector is different from that of the first protector.

[0101] In the embodiment of the utility model, when the first power supply module 110 is abnormal, the power supply switching module 130 will be activated, that is, the first end 131 is disconnected from the third end 133, and the second end 132 is connected to the third end 133. When the power supply switching module 130 fails, and the first end 131 and the second end 132 are connected to the third end 133 at the same time, if the third protector is activated first, the second end 132 and the second power supply module 120 will be cut off. At this time, the first power supply module 110 will supply power to the target device 140. Since the abnormality of the first power supply module 110 has not been resolved, the target device 140 may lose power. Therefore, in some specific embodiments, the response time of the third protector can be longer than the response time of the first protector, so that when the first end 131 and the second end 132 are connected to the third end 133 at the same time, the power supply of the first power supply module 110 is cut off as much as possible, so as to prevent the power supply module of the target device 140 from being switched back to the first power supply module 110 when the abnormality of the first power supply module 110 has not been resolved.

[0102] Figure 4 The schematic diagram of the uninterruptible power supply unit in the embodiment of the utility model is schematically shown.

[0103] Reference Figure 4In some specific embodiments, the uninterruptible power supply unit 111 includes a main power supply subunit 1111, a bypass power supply subunit 1112, and a control subunit 1113. The main power supply subunit 1111 is connected between the first power source V1 and the first terminal 131, the bypass power supply subunit 1112 is connected to the first terminal 131, and the control subunit 1113 is connected to the main power supply subunit 1111 and the bypass power supply subunit 1112. The control subunit 1113 is configured to: when one of the first terminal 131 and the second terminal 132 is connected to the third terminal 133, the main power supply subunit 1111 supplies power to the first terminal 131, and the bypass power supply subunit 1112 is disconnected from the first terminal 131. When both the first terminal 131 and the second terminal 132 are connected to the third terminal 133, the main power supply subunit 1111 is disconnected from the first terminal 131, and the bypass power supply subunit 1112 supplies power to the first terminal 131. The second power supply module 120 and the bypass power supply sub-unit 1112 are connected to the same power supply. Exemplarily, both are directly connected to the second power supply V2, and the second power supply may be a mains power supply.

[0104] In an embodiment of the utility model, the main power supply subunit 1111 may include a first power supply module 1a and an energy storage module 1b. The first power supply module 1a is connected to the first power source V1 and the energy storage module 1b. When the first power source V1 operates normally, the first power supply module 1a supplies power to the first terminal 131 and charges the energy storage module 1b at the same time. When the first power supply module 1a is abnormal, the first power supply module 1a and the first terminal 131 are cut off, and the energy storage module 1b supplies power to the first power source V1 instead. When both the first power supply module 1a and the energy storage module 1b are abnormal, or when the first power supply module 1a and the energy storage module 1b switch abnormally, the first power supply module 1a and the energy storage module 1b are cut off from the first terminal 131, and the bypass power supply subunit 1112 supplies power to the first terminal 131 instead.

[0105] In an embodiment of the present invention, since the second power supply module 120 and the bypass power supply subunit 1112 in the first power supply module 110 are connected to the same power supply, even if the first power supply module 110 and the second power supply module 120 supply power to the target device 140 at the same time, the target device 140 will not be overloaded.

[0106] In the embodiment of the present utility model, when the first end 131 and the second end 132 are both connected to the third end 133, the first protector, the third protector and the control subunit 1113 can compete for action, and the one with a faster reaction completes the action first, and the other two with a slower reaction may no longer perform the action. However, this does not constitute a limitation on the embodiment of the present utility model. For example, the other two with a slower reaction may continue to compete, which can be determined according to actual needs and is not limited here.

[0107] Figure 5The fourth schematic diagram of the power supply control circuit in the embodiment of the utility model is schematically shown.

[0108] Reference Figure 5 In some specific embodiments, the first power supply module 110 and the second power supply module 120 are AC power supply modules, and the power switching module 130 may include an AC contactor, wherein the AC contactor includes a first electromagnetic coil 131 and two interlocking switches, the two switches are respectively a normally open switch 132 and a normally closed switch 133, wherein the interlocking of the two switches is controlled by the electromagnetic coil. Among the two switches, one is connected between the first end 131 and the third end 133, and the other is connected between the second end 132 and the third end 133, for example, the normally open switch 132 is connected between the first end 131 and the third end 133, the first electromagnetic coil 131 is connected between the first end 131 and the normally open switch 132, and the normally closed switch 133 is connected between the second end 132 and the third end 133. The first preset time and the second preset time can be configured by the response time of the AC contactor, for example, the first preset time and the second preset time are positively correlated with the response time of the AC contactor, that is, the shorter the response time of the AC contactor, the shorter the first preset time and the second preset time.

[0109] In the embodiment of the utility model, the AC contactor is small in size and can be installed on any security inspection equipment or certain components of the security inspection equipment. At the same time, the AC contactor has a low impact on the existing circuit and has the characteristics of short response time, so that the above-mentioned power supply reliability function can be achieved on the basis of minimizing the improvement cost.

[0110] In some specific embodiments, any of the first preset time and the second preset time is less than 30ms. For example, any of the first preset time and the second preset time is less than 20ms, so that it can be ensured that the target device 140 will not lose power during the switching process, thereby preventing the power failure from damaging the target device 140 or causing the security inspection equipment to stop working.

[0111] In some specific embodiments, the power switching module 130 satisfies at least one of the following conditions:

[0112] The lower limit of the current that the power switching module 130 can allow to pass is greater than or equal to 20 A. For example, the lower limit of the current that the power switching module 130 can allow to pass is 25 A. In this way, the power switching module 130 can meet the power supply current requirements of most security inspection equipment, so that the power control circuit can adapt to more security inspection equipment (or components on security inspection equipment).

[0113] The upper limit of the operating temperature range of the power switching module 130 is greater than or equal to 50° C. For example, the upper limit of the operating temperature range of the power switching module 130 is 60° C. In this way, the power switching module 130 can operate at a high temperature of 60° C., so that the power control circuit can operate in more extreme weather or room temperature, thereby improving the reliability of the power control circuit.

[0114] The upper limit of the operating humidity of the power switching module 130 is greater than or equal to 80%. For example, the upper limit of the operating humidity of the power switching module 130 is 90%. In this way, the power switching module 130 can operate at a higher humidity without short circuit, so that the power control circuit can operate normally in a high humidity environment.

[0115] Figure 6 The schematic diagram of the control module in the embodiment of the utility model is schematically shown.

[0116] Reference Figure 6 In some specific embodiments, the power control circuit further includes a control module 170, which is connected between the third terminal 133 and the target device 140. The control module 170 is configured to: send a first shutdown signal to the target device 140 in response to the first instruction; and disconnect the third terminal 133 from the target device 140 after the first shutdown signal is sent for a first preset time. The first shutdown signal is configured to: cause the target device 140 to perform a first shutdown operation.

[0117] In an embodiment of the present utility model, the control module 170 includes a control unit 171 and a first switch unit 1721 connected between the third end 133 and the target device 140, and the first switch unit 1721 is connected to the control unit 171. The control unit 171 is also connected to the second switch unit 1722, and the user can send a first instruction to the control unit 171 through the second switch unit 1722. The control unit 171 can control the first switch unit 1721 to disconnect according to the first instruction, thereby disconnecting the third end 133 from the target device 140. For example, the first switch unit 1721 includes an AC contactor. Optionally, the second switch unit 1722 can include a key switch, and the user can send the first instruction to the control unit 171 by rotating the key switch (disconnecting).

[0118] Optionally, the control unit 171 is also connected to the third switch unit 1723, and the third switch unit 1723 may include a lighted switch. If the user wants to power the target device 140, he needs to rotate the key switch 1721 (close) and close the lighted switch 1722 to perform two-step control. When the key switch 1721 and the lighted switch 1722 are both closed, the control unit 171 controls the first switch unit 1721 to be turned on, and then the third end 133 is turned on with the target device 140, so as to power the target device 140. In this way, false triggering and other phenomena can be prevented, and the power-on safety of the target device 140 can be improved. Exemplarily, the lighted switch 1722 may include a first button, and the user can control the lighted switch 1722 to be closed or disconnected by clicking the first button.

[0119] Optionally, the first button can automatically reset after the user clicks it. For example, after the user presses the first button, the illuminated switch 1722 is closed (or disconnected). When the user releases the button, the first button can rebound under the drive of the reset mechanism, thereby automatically resetting.

[0120] Optionally, the illuminated switch 1722 can reflect whether the target device 140 has completed powering on. For example, when the first switch unit 1721 is turned on, the illuminated switch lights up, thereby indicating that the target device 140 has completed powering on.

[0121] Optionally, before controlling the first switch unit 1721 to turn on, the control unit 171 further determines whether the third terminal 133 has a power supply condition, for example, whether the third terminal 133 is loaded with an expected voltage. When the third terminal 133 has a power supply condition, the control unit 171 controls the first switch unit 1721 to turn on.

[0122] In an embodiment of the present invention, the first preset time length can ensure that the target device 140 (e.g., a server) completes the first shutdown operation, thereby preventing a sudden power failure from causing damage to the target device 140. For example, the first preset time length can be set between 100S and 140S, for example, the first preset time length can be set to 120S.

[0123] In the embodiment of the present utility model, the control module 170 controls the connection or disconnection between the third terminal 133 and the target device 140. In this way, when the third terminal 133 and the target device 140 are disconnected, the uninterruptible power supply unit 111 can continue to be powered, so as to continue to work, and prevent the uninterruptible power supply unit 111 from frequently turning on and off and increasing its failure rate.

[0124] Combined with reference Figure 4 and Figure 6In some specific embodiments, the uninterruptible power supply unit 111 includes an energy storage module 1b. The energy storage module 1b can refer to the above embodiments, so it will not be described here. The control module 170 is also configured to: when the first power supply V1 and the second power supply V2 are both powered off, and the remaining power of the energy storage module 1b is lower than the preset power, send a first shutdown signal to the target device 140; and after the first shutdown signal is sent for a second preset time, disconnect the third terminal 133 from the target device 140.

[0125] In the embodiment of the utility model, when both the first power source V1 and the second power source V2 lose power, and the remaining power of the energy storage module 1b is lower than the preset power, it indicates that the power supply to the target device 140 is about to fail, and thus, before the power supply fails, the control module 170 sends a first shutdown signal to shut down the target device 140 in advance to prevent the sudden power failure from causing damage to the target device 140. For example, the second preset time length can be set between 100S and 140S, for example, the second preset time length can be set to 120S.

[0126] Optionally, when both the first power supply V1 and the second power supply V2 lose power, the control module 170 can obtain the remaining power of the energy storage module 1b through the I / O interface or the communication detection interface. If it is higher than the preset power, it can wait for a certain period of time and then perform detection again until the remaining power of the energy storage module 1b is lower than the preset power, or one of the first power supply V1 and the second power supply V2 resumes power supply.

[0127] Optionally, the preset power is a settable value, and the preset power should be able to meet the shutdown time requirement of the target device 140. For example, the preset power can be set to 25% to 15% of the rated power of the energy storage module 1b. For example, the preset power can be set to 20% of the rated power of the energy storage module 1b.

[0128] In some specific embodiments, the control module 170 is further connected to the uninterruptible power supply unit 111, and the control module 170 is further configured to send a second shutdown signal to the uninterruptible power supply unit 111 after disconnecting the third terminal 133 from the target device 140. The second shutdown signal is configured to cause the uninterruptible power supply unit 111 to perform a second shutdown operation.

[0129] In an embodiment of the utility model, after the first switch unit 1721 disconnects the third terminal 133 from the target device 140, it can feed back an electrical signal that can indicate that the disconnection is completed to the control unit 171. When receiving the electrical signal, the control unit 171 determines that the target device 140 has completed the power-off, and at this time, sends a second shutdown signal to the uninterruptible power supply unit 111. Therefore, when both the first power supply V1 and the second power supply V2 lose power, and the remaining power of the energy storage module 1b is lower than the preset power, the uninterruptible power supply unit 111 can be turned off on the premise of ensuring that the shutdown of the target device 140 is completed, thereby avoiding the exhaustion of the energy storage module 1b and preventing the energy storage module 1b from being damaged, thereby protecting both the target device 140 and the uninterruptible power supply unit 111.

[0130] Optionally, when a power source (eg, the first power source V1 ) that supplies power to the uninterruptible power supply unit 111 receives power, the uninterruptible power supply unit 111 may start automatically.

[0131] Optionally, the control module 170 may also read relevant information of the uninterruptible power supply unit 111, such as voltage, and feed it back to the centralized control system, thereby realizing remote real-time monitoring, etc.

[0132] In some specific embodiments, the power switching module 130 may also include two AC contactors connected in parallel and mechanically interlocked. In this example, a certain response speed may be sacrificed, but the mechanical interlocking can ensure that the power switching module 130 will not fail.

[0133] In some specific embodiments, when the target device 140 does not have a high current requirement, the power switching module 130 may further include a solid-state relay.

[0134] The embodiment of the utility model has developed a power control circuit for security inspection equipment, which combines an uninterruptible power supply unit 111 with a power switching module 130 to achieve fast and safe automatic switching when a power supply failure occurs. The response speed can be achieved within 20 to 30 ms, so that devices with high power supply requirements such as servers and displays will not lose power, and flashing caused by power failure can be prevented. At the same time, the embodiment of the utility model can achieve non-stop maintenance of the uninterruptible power supply unit 111 through the cooperation of the first isolation module 160 and the power switching module 130. When maintaining or replacing the uninterruptible power supply unit 111, the security inspection equipment can always maintain normal operation. At least, the power switching module 130 of the embodiment of the utility model can be implemented by an AC contactor, which has the characteristics of high reliability, small size, flexible installation and low cost.

[0135] Some embodiments of the utility model also include a security inspection device, wherein the security inspection device includes the above-mentioned power control circuit. The security inspection device may include but is not limited to CT equipment, such as slip ring CT equipment, static CT equipment, and multi-view equipment.

[0136] In the embodiment of the utility model, the uninterruptible power supply unit 111 and the power switching module 130 form a double insurance design for power supply, which greatly improves the reliability of power supply. In addition, the switching between the first power supply module 110 and the second power supply module 120 is fully automatic, and the entire process does not require manual intervention, and the switching speed is fast, thereby ensuring that the target device 140 will not lose power in this scenario, thereby enabling the security inspection equipment to continue to work normally, greatly improving the ability of the security inspection equipment to cope with sudden power failures.

[0137] It should be understood that the security inspection device according to the embodiment of the present utility model has all the characteristics and advantages of the above-mentioned alignment mechanism. For details, please refer to the above description and will not be repeated here.

[0138] It will be appreciated by those skilled in the art that the features described in the various embodiments of the present invention may be combined and / or combined in various ways, even if such combinations and / or combinations are not explicitly described in the present invention. In particular, without departing from the spirit and teachings of the present invention, the features described in the various embodiments of the present invention may be combined and / or combined in various ways. All of these combinations and / or combinations fall within the scope of the present invention.

[0139] The embodiments of the present invention are described above. However, these embodiments are only for the purpose of illustration and are not intended to limit the scope of the present invention. Although the embodiments are described above separately, this does not mean that the measures in the various embodiments cannot be used in combination to advantage. Without departing from the scope of the present invention, those skilled in the art may make a variety of substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A power control circuit, characterized in that: include: A first power supply module; A second power supply module, one of the first power supply module and the second power supply module comprises an uninterruptible power supply unit, and the other comprises a mains power supply unit; a power switching module, the power switching module comprising a first end, a second end and a third end, the first end being connected to the first power supply module, the second end being connected to the second power supply module, and the third end being connected to the target device; The power switching module is configured to: perform a first switching operation when the power supply of the first end is abnormal, and perform a second switching operation when the power supply of the first end returns to normal; The first switching operation includes: disconnecting the first end from the third end, and connecting the second end to the third end within a first preset time; The second switching operation includes: disconnecting the second end from the third end, and connecting the first end to the third end within a second preset time; The first preset time and the second preset time are configured such that when any operation of the first switching operation and the second switching operation is performed, the target device will not lose power.

2. The power control circuit according to claim 1, characterized in that: The first power supply module includes an uninterruptible power supply unit, the second power supply module includes a mains power supply unit, the uninterruptible power supply unit is connected to the first power supply, and the power supply control circuit also includes a first isolation module; The first isolation module is connected between the first end and the uninterruptible power supply unit, and between the uninterruptible power supply unit and the first power supply; The first isolation module is configured to: isolate the first end from the uninterruptible power supply unit in response to a first operation of a user, and, after isolating the first end from the uninterruptible power supply unit, isolate the uninterruptible power supply unit from the first power source; The power switching module is specifically configured to: perform the first switching operation when the first end is isolated from the uninterruptible power supply unit, and perform the second switching operation when the first end is connected to the uninterruptible power supply unit.

3. The power control circuit according to claim 2, characterized in that: The first isolation module includes: a first isolator and a second isolator, the first isolator is connected between the first end and the uninterruptible power supply unit, and the second isolator is connected between the uninterruptible power supply unit and the first power supply; The first isolation module further includes: a first protector, the first protector being integrated with the first isolator; The first protector is configured to control the first isolator to isolate the first end from the third end when the first end is conductively connected to the third end and the second end is conductively connected to the third end.

4. The power control circuit according to claim 3, characterized in that: The first isolation module further includes: a second protector, the second protector being integrated with the second isolator; The second protector is configured to control the second isolator to isolate the uninterruptible power supply unit from the first power supply when a preset fault occurs in the uninterruptible power supply unit, wherein the preset fault includes at least one of an overload fault and a short circuit fault.

5. The power control circuit according to claim 2, characterized in that: The power control circuit further includes a third isolator and a third protector, wherein the third isolator is connected between the second end and the mains power supply unit, and the third protector is integrated with the third isolator; The third protector is configured to control the third isolator to isolate the second end from the third end when the second end is conductively connected to the third end and the first end is conductively connected to the third end.

6. The power control circuit according to claim 5, characterized in that: The first isolation module includes: a first isolator and a second isolator, the first isolator is connected between the first end and the uninterruptible power supply unit, and the second isolator is connected between the uninterruptible power supply unit and the first power supply; The first isolation module further includes: a first protector, the first protector being integrated with the first isolator; The first protector is configured to: when the first end is conductively connected to the third end, and the second end is conductively connected to the third end, control the first isolator to isolate the first end from the third end; The third protector has a different response time from the first protector.

7. The power control circuit according to claim 2, characterized in that: The uninterruptible power supply unit includes a main power supply subunit, a bypass power supply subunit and a control subunit; The main power supply subunit is connected between the first power source and the first end, the bypass power supply subunit is connected to the first end, and the control subunit is connected to the main power supply subunit and the bypass power supply subunit; The control subunit is configured to: when one of the first end and the second end is connected to the third end, the main power supply subunit supplies power to the first end and the bypass power supply subunit is disconnected from the first end; when both the first end and the second end are connected to the third end, the main power supply subunit is disconnected from the first end and the bypass power supply subunit supplies power to the first end; Wherein, the first power supply module and the bypass power supply sub-unit are connected to the same power supply.

8. The power control circuit according to claim 1, characterized in that: The power switching module includes: an AC contactor, the AC contactor includes a first electromagnetic coil, a normally open switch and a normally closed switch; The normally open switch is connected between the first end and the third end, the first electromagnetic coil is connected between the first end and the normally open switch, and the normally closed switch is connected between the second end and the third end.

9. The power control circuit according to claim 1, characterized in that: The power control circuit further includes a control module connected between the third terminal and the target device; The control module is configured to: send a first shutdown signal to the target device in response to a first instruction; After the first shutdown signal is sent for a first preset time, disconnecting the third end from the target device; The first shutdown signal is configured to cause the target device to perform a first shutdown operation.

10. The power control circuit according to claim 9, characterized in that: The first power supply module is connected to a first power supply, the second power supply module is connected to a second power supply, the uninterruptible power supply unit includes an energy storage module, and the control module is further configured as follows: When both the first power source and the second power source lose power and the remaining power of the energy storage module is lower than a preset power, sending the first shutdown signal to the target device; After the first shutdown signal is sent for a second preset time, the third end is disconnected from the target device.

11. The power supply control circuit according to claim 10, characterized in that: The control module is also connected to the uninterruptible power supply unit, and the control module is further configured as follows: After disconnecting the third terminal from the target device, sending a second shutdown signal to the uninterruptible power supply unit; The second shutdown signal is configured to cause the uninterruptible power supply unit to perform a second shutdown operation.

12. The power supply control circuit according to any one of claims 1 to 11, characterized in that: Any of the first preset time and the second preset time is less than 30 ms.

13. The power supply control circuit according to any one of claims 1 to 11, characterized in that: The power switching module satisfies at least one of the following conditions: The lower limit of the current allowed to pass through the power switching module is greater than or equal to 20A; The upper limit of the operating temperature range of the power switching module is greater than or equal to 50° C.; The upper limit of the working humidity of the power switching module is greater than or equal to 80%.

14. A security inspection device, characterized in that: The method comprises a power control circuit as claimed in any one of claims 1 to 13.

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