Power supply control circuit and security check device

Abstract

The present disclosure relates to the technical field of security check, and provides a power supply control circuit and a security check device. The power supply control circuit comprises: a first power supply module; a second power supply module, wherein 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; and a power supply switching module, wherein the power supply 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 a target apparatus; and the power supply switching module is configured to: when the power supply of the first end is abnormal, disconnect the first end and the third end, and connect the second end and the third end within a first preset time; and when the power supply of the first end returns to normal, disconnect the second end and the third end, and connect the first end and the third end within a second preset time, wherein the first preset time and the second preset time are configured such that: during the execution of switching operations, the target apparatus does not experience a power loss.

Description

Power control circuits and security equipment

[0001] This application claims priority to Chinese patent application No. 202311863927.3 filed on December 29, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present disclosure relates to the field of security inspection technology, and in particular to a power supply control circuit and security inspection equipment. Background Art

[0003] Security inspection equipment is a system used to inspect luggage and cargo within the security field. It uses a transport device to transport luggage and cargo into a closed scanning chamber, where it is scanned and then delivered. Security inspection equipment must quickly process large volumes of luggage and cargo, placing high demands on power supply protection.

[0004] In one example, an uninterruptible power supply (UPS) provides power to security equipment (or its components). When the mains power supply is normal, the UPS stabilizes the mains power and supplies it to the security equipment. When the mains power supply is abnormal, the UPS uses its internal battery module to power the security equipment. However, UPSs inherently carry a certain risk of failure. If the UPS fails, the security equipment will lose power, leading to data loss, system crashes, and even hardware damage. These can lead to serious consequences, such as stranded passengers and flight delays. Summary of the Invention

[0005] The present disclosure provides a power control circuit and security inspection equipment.

[0006] According to a first aspect of the present disclosure, there is provided a power supply control circuit, comprising:

[0007] a first power supply module;

[0008] a second power supply module, wherein 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;

[0009] 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;

[0010] The power switching module is configured to: perform a first switching operation when the power supply to the first end is abnormal, and perform a second switching operation when the power supply to the first end returns to normal;

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

[0012] 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;

[0013] 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.

[0014] 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 control circuit further includes a first isolation module;

[0015] 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;

[0016] The first isolation module is configured to: isolate the first terminal from the uninterruptible power supply unit in response to a first operation of a user, and, after isolating the first terminal from the uninterruptible power supply unit, isolate the uninterruptible power supply unit from the first power source;

[0017] 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.

[0018] 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;

[0019] The first isolation module further includes: a first protector, wherein the first protector is integrated with the first isolator;

[0020] 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.

[0021] In some specific embodiments, the first isolation module further includes: a second protector, the second protector being integrated with the second isolator;

[0022] 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.

[0023] 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 and the third isolator are integrated;

[0024] 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.

[0025] 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;

[0026] The first isolation module further includes: a first protector, wherein the first protector is integrated with the first isolator;

[0027] 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;

[0028] The third protector has a different response time from the first protector.

[0029] In some specific embodiments, the uninterruptible power supply unit includes a main power supply subunit, a bypass power supply subunit, and a control subunit;

[0030] 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;

[0031] The control subunit is configured to: when one of the first end and the second end is conductively connected to the third end, enable the main power supply subunit to supply power to the first end and disconnect the bypass power supply subunit from the first end; when both the first end and the second end are conductively connected to the third end, disconnect the main power supply subunit from the first end and enable the bypass power supply subunit to supply power to the first end;

[0032] The first power supply module and the bypass power supply sub-unit are connected to the same power supply.

[0033] 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;

[0034] 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.

[0035] In some specific embodiments, the power control circuit further includes a control module connected between the third terminal and the target device;

[0036] The control module is configured to: send a first shutdown signal to the target device in response to a first instruction;

[0037] After the first shutdown signal is sent for a first preset time, disconnecting the third end from the target device;

[0038] The first shutdown signal is configured to cause the target device to perform a first shutdown operation.

[0039] In some specific embodiments, the first power supply module is connected to a first power source, the second power supply module is connected to a second power source, the uninterruptible power supply unit includes an energy storage module, and the control module is further configured to:

[0040] 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;

[0041] After the first shutdown signal is sent for a second preset time, the third end is disconnected from the target device.

[0042] In some specific embodiments, the control module is further connected to the uninterruptible power supply unit, and the control module is further configured to:

[0043] After disconnecting the third terminal from the target device, sending a second shutdown signal to the uninterruptible power supply unit;

[0044] The second shutdown signal is configured to cause the uninterruptible power supply unit to perform a second shutdown operation.

[0045] In some specific embodiments, any of the first preset time and the second preset time is less than 30 ms.

[0046] In some specific embodiments, the power switching module satisfies at least one of the following conditions:

[0047] The lower limit of the current allowed to pass through the power switching module is greater than or equal to 20A;

[0048] The upper limit of the operating temperature range of the power switching module is greater than or equal to 50°C;

[0049] The upper limit of the operating humidity of the power switching module is greater than or equal to 80%.

[0050] A second aspect of the present disclosure provides a security inspection device, which includes the above-mentioned power control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The above contents and other objects, features and advantages of the present disclosure will become more apparent through the following description of the embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0052] FIG1 schematically shows one of the schematic diagrams of a power supply control circuit in an embodiment of the present disclosure;

[0053] FIG2 schematically shows a second schematic diagram of a power supply control circuit in an embodiment of the present disclosure;

[0054] FIG3 schematically shows a third schematic diagram of a power supply control circuit in an embodiment of the present disclosure;

[0055] FIG4 schematically shows a schematic diagram of an uninterruptible power supply unit according to an embodiment of the present disclosure;

[0056] FIG5 schematically shows a fourth schematic diagram of a power supply control circuit in an embodiment of the present disclosure;

[0057] FIG6 schematically shows a schematic diagram of a control module in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0058] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0059] It should be noted that in the drawings, the sizes and relative sizes of elements may be exaggerated for clarity and / or descriptive purposes. Thus, the sizes and relative sizes of the individual elements are not necessarily limited to those shown in the drawings. In the specification and drawings, the same or similar reference numerals indicate the same or similar parts.

[0060] When an element is described as being "on" another element, "connected to" another element, or "coupled to" another element, the element may be directly on the other element, directly connected to the other element, or directly coupled 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 coupled 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 "connected" may refer to a physical connection, an electrical connection, a communication connection, and / or a fluid connection. In addition, the X-axis, Y-axis, and 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, Y-axis, and Z-axis may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. For the purposes of this disclosure, “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 associated listed items.

[0061] 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 portions, these parts, components, elements, regions, layers, and / or portions should not be limited by these terms. Rather, these terms are used to distinguish one part, component, element, region, layer, and / or portion from another. Thus, for example, the first part, first member, first element, first region, first layer, and / or first portion discussed below may be referred to as a second part, second member, second element, second region, second layer, and / or second portion without departing from the teachings of the present disclosure.

[0062] For ease of description, spatially relative 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 figures. It should be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features.

[0063] 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 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. To account for 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 are inclusive of the stated value and mean within an acceptable range of deviation for the particular value 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.

[0064] An embodiment of the present disclosure 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 (UPS), and the other comprises a mains power supply (CPS). The power switching module comprises a first terminal, a second terminal, and a third terminal. The first terminal is connected to the first power supply module, the second terminal is connected to the second power supply module, and the third terminal is connected to a target device.

[0065] The power switching module is configured to: perform a first switching operation when a power supply anomaly occurs at the first terminal, and perform a second switching operation when power supply to the first terminal returns to normal. The first switching operation includes disconnecting the first terminal from the third terminal, and connecting the second terminal to the third terminal within a first preset time. The second switching operation includes disconnecting the second terminal from the third terminal, and connecting the first terminal to the third terminal within a second preset time. The first preset time and the second preset time are configured such that the target device will not lose power during the execution of either the first switching operation or the second switching operation.

[0066] In the disclosed embodiments, a dual-failure power supply design, achieved through an uninterruptible power supply unit and a power switching module, significantly improves power supply reliability. Furthermore, the switching between the first and second power supply modules is fully automatic, requiring no human intervention. This rapid switching ensures that the target device will not experience power loss in this scenario, allowing the security inspection equipment to continue operating normally and significantly enhancing its ability to respond to sudden power failures.

[0067] The power control circuit of the embodiment of the present disclosure will be described in detail below with reference to FIG. 1 to FIG. 6 .

[0068] FIG1 schematically shows one of the schematic diagrams of the power control circuit in an embodiment of the present disclosure.

[0069] 1 , in an embodiment of the present disclosure, a power control circuit is provided, comprising: 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 comprises an uninterruptible power supply (UPS), and the other comprises a mains power supply unit.

[0070] 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 clarity, unless otherwise specified, the following description will be based on the example of the first power supply module 110 being an uninterruptible power supply unit and the second power supply module 120 being a mains power supply unit. 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.

[0071] The power switching module 130 includes a first end 131, a second end 132, and a third end 133. 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 the embodiments of the present disclosure, the power control circuit is applied to security inspection equipment. For example, the target device 140 may be a security inspection equipment or certain equipment or components in the security inspection equipment that have high power requirements, such as a server.

[0072] The power switching module 130 is configured to perform a first switching operation when the power supply to the first terminal 131 is abnormal, and to perform a second switching operation when the power supply to the first terminal 131 returns to normal. The first switching operation includes disconnecting the first terminal 131 from the third terminal 133 and, within a first preset time, connecting the second terminal 132 to the third terminal 133. The second switching operation includes disconnecting the second terminal 132 from the third terminal 133 and, within a second preset time, connecting the first terminal 131 to the third terminal 133. The first preset time and the second preset time are configured such that the target device 140 will not lose power during either the first switching operation or the second switching operation.

[0073] In an embodiment of the present disclosure, 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 a power outage, 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 to 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 a 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.

[0074] 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.

[0075] In an embodiment of the present disclosure, after the first power supply module 110 is restored to normal through maintenance or other means, the first power supply module 110 resumes supplying power to the first terminal 131, that is, the power supply to the first terminal 131 is restored to normal. At this time, the power switching module 130 can immediately respond and switch the power supply module back to the first power supply module 110, that is, perform a second switching operation. In the second switching operation, the power switching module 130 first disconnects the second terminal 132 from the third terminal 133, and then connects the first terminal 131 to the third terminal 133 within a second preset time. At this time, the first power supply module 110 (e.g., an uninterruptible power supply unit) will resume supplying power to the target device 140.

[0076] 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 performing 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.

[0077] 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. One of the two switches 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.

[0078] 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 present disclosure, 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 anomaly 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 malfunctions, power can be supplied by the energy storage module. Even when the energy storage module malfunctions, power can be supplied by the bypass sub-unit. This ensures that the target device 140 can always receive effective power when the mains power supply unit malfunctions. The specific structure of the uninterruptible power supply unit will be described in detail below and will not be detailed here.

[0079] 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 additional mains power supply unit or a mains power supply unit that has been connected to the reused security inspection equipment. Although the uninterruptible power supply unit can provide a strong power anomaly response capability, compared with the mains power supply unit, the uninterruptible power supply unit itself also has a failure risk. In the embodiment of the present disclosure, 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, it can automatically switch to the mains power supply unit through the power switching module 130, 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.

[0080] In this way, whether the mains power supply unit is used as the first power supply module 110 (i.e., the primary power supply module) or the uninterruptible power supply unit is used as the first power supply module 110, the embodiments of the present disclosure only require the addition of a power switching module 130 and a second power supply module 120 to the existing power supply circuit, thereby forming a dual-insurance design for power supply, significantly improving power supply reliability. Furthermore, the switching between the first power supply module 110 and the second power supply module 120 is fully automatic, requiring no manual intervention, and the switching speed is fast, thereby ensuring that the target device 140 will not lose power in this scenario, thereby allowing the security inspection equipment to continue to operate normally, significantly improving the security inspection equipment's ability to respond to sudden power failures.

[0081] The power control circuit of the embodiment of the present disclosure will be further described below with reference to FIG. 2 to FIG. 6 .

[0082] FIG2 schematically shows a second schematic diagram of the power control circuit in an embodiment of the present disclosure.

[0083] 2 , in some specific embodiments, the first power supply module 110 includes an uninterruptible power supply (UPS) 111, and the second power supply module 120 includes a mains power supply (CPS) 121. The UPS 111 is connected to a first power source V1, and the CPS 121 is connected to a second power source V2. Optionally, the first power source V1 and the second power source V2 are the same.

[0084] The power control circuit also includes a first isolation module 160. First isolation module 160 is connected between first terminal 131 and uninterruptible power supply 111, and between uninterruptible power supply 111 and first power source V1. First isolation module 160 is configured to isolate first terminal 131 from uninterruptible power supply 111 in response to a first user operation, and, after isolating first terminal 131 from uninterruptible power supply 111, isolate uninterruptible power supply 111 from first power source V1.

[0085] In an embodiment of the present disclosure, 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 operate sequentially in response to the same user operation, 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 operate independently, for example, the user first operates one of the isolators to 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 being disconnected from the first power source V1 , thereby preventing the output of the UPS 111 from being abnormal and affecting the target device 140 .

[0086] In an embodiment of the present disclosure, the power switching module 130 is specifically configured to perform a first switching operation when the first terminal 131 is isolated from the uninterruptible power supply 111, and to perform a second switching operation when the first terminal 131 is connected to the uninterruptible power supply 111. Specifically, when the first isolation module 160 isolates the first terminal 131 from the uninterruptible power supply 111, the first terminal 131 loses power. At this point, the power switching module 130 then performs the first switching operation, namely, disconnecting the first terminal 131 from the third terminal 133 and connecting the second terminal 132 to the third terminal 133, thereby switching the power supply module of the target device 140 to the second power supply module 120. In other words, in an embodiment of the present disclosure, the cooperation between the first isolation module 160 and the power switching module 130 allows a user to isolate the power supply circuits of the uninterruptible power supply 111 from the target device 140 with a single click, thereby enabling maintenance or replacement of the uninterruptible power supply 111. Furthermore, during this process, the target device 140 will not lose power, and the entire security inspection equipment can always maintain normal operation.

[0087] In an embodiment of the present disclosure, when maintenance or replacement of the uninterruptible power supply (UPS) 111 is complete, the user can perform a second operation. The first isolation module 160 is further configured to, in response to the user's second operation, connect the first terminal 131 to the UPS 111, and, after connecting the first terminal 131 to the UPS 111, connect the UPS 111 to the first power source V1. At this point, the UPS 111 starts up and begins supplying power. When the UPS 111 is able to provide stable power, the power supply to the first terminal 131 returns to normal. At this point, the power switching module 130 then performs a second switching operation. Specifically, the power switching module 130 disconnects the second terminal 132 from the third terminal 133, connecting the first terminal 131 to the third terminal 133, thereby switching the target device 140's power supply back to the UPS 111. That is, in the embodiment of the present disclosure, through the cooperation between the first isolation module 160 and the power switching module 130 , the user can restore the power supply from the uninterruptible power supply unit 111 to the target device 140 with a single button operation.

[0088] 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.

[0089] 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 terminal 131 and the uninterruptible power supply 111, and the second isolator 162 is connected between the uninterruptible power supply 111 and the first power source V1. The first isolation module 160 also includes a first protector (not shown), which is integrated with the first isolator 161. The first protector is configured to control the first isolator 161 to isolate the first terminal 131 from the third terminal 133 when the first terminal 131 is electrically connected to the third terminal 133 and the second terminal 132 is electrically connected to the third terminal 133.

[0090] In the embodiment of the present disclosure, the uninterruptible power supply unit 111 is powered by AC. For example, 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.

[0091] In the embodiments of the present disclosure, the security inspection equipment operates in a complex environment, and the power switching module 130 may fail for various reasons. One such situation includes: in the power switching module 130, the linkage between the first end 131 and the second end 132 fails, causing the first end 131 and the second end 132 to be simultaneously connected to the third end 133. In this case, 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 an abnormality such as an overload. Therefore, a first protector is integrated with at least the first isolator 161. When the first end 131 and the second end 132 are simultaneously connected to the third end 133, the first protector can immediately operate to control the first isolator 161 to disconnect the first end 131 and the third end 133, ensuring that at most only one power supply module (i.e., the second power supply module 120) supplies power to the target device 140, thereby preventing an overload on the target device 140.

[0092] 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.

[0093] 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 control the second isolator 162 to isolate the uninterruptible power supply 111 from the first power source V1 when a predetermined fault occurs in the uninterruptible power supply 111. The predetermined fault includes at least one of an overload fault and a short circuit fault.

[0094] 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 can be formed between the first power supply V1 and the uninterruptible power supply unit 111, thereby improving the reliability of the power control circuit.

[0095] FIG3 schematically shows a third schematic diagram of the power control circuit in an embodiment of the present disclosure.

[0096] 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 terminal 132 and the mains power supply unit, and the third protector is integrated with the third isolator 163. The third protector is configured to control the third isolator 163 to isolate the second terminal 132 from the third terminal 133 when the second terminal 132 and the third terminal 133 are conductively connected and the first terminal 131 and the third terminal 133 are conductively connected.

[0097] In an embodiment of the present disclosure, 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.

[0098] 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.

[0099] 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 terminal 131 and the uninterruptible power supply 111, and the second isolator 162 is connected between the uninterruptible power supply 111 and the first power source V1. The first isolation module 160 also includes a first protector, which is integrated with the first isolator 161. The first protector is configured to control the first isolator 161 to isolate the first terminal 131 from the third terminal 133 when the first terminal 131 is electrically connected to the third terminal 133 and the second terminal 132 is electrically connected to the third terminal 133. The third protector has a different response time than the first protector.

[0100] In the embodiments of the present disclosure, when an abnormality occurs in the first power supply module 110, the power switching module 130 is activated, that is, the first terminal 131 is disconnected from the third terminal 133, and the second terminal 132 is connected to the third terminal 133. If the power switching module 130 fails and the first terminal 131 and the second terminal 132 are simultaneously connected to the third terminal 133, if the third protector activates first, the second terminal 132 and the second power supply module 120 are disconnected. At this point, the first power supply module 110 will supply power to the target device 140. However, since the abnormality in the first power supply module 110 has not yet 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 that of the first protector. Therefore, when the first terminal 131 and the second terminal 132 are simultaneously connected to the third terminal 133, the first power supply module 110 is disconnected first as much as possible. This prevents the target device 140 from being switched back to the first power supply module 110 if the abnormality in the first power supply module 110 has not yet been resolved.

[0101] FIG4 schematically shows a schematic diagram of an uninterruptible power supply unit in an embodiment of the present disclosure.

[0102] 4 , in 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 both 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 electrically connected to the third terminal 133, cause the main power supply subunit 1111 to supply power to the first terminal 131 and disconnect the bypass power supply subunit 1112 from the first terminal 131. When both the first terminal 131 and the second terminal 132 are electrically connected to the third terminal 133, cause the main power supply subunit 1111 to disconnect from the first terminal 131 and cause the bypass power supply subunit 1112 to supply 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. For example, both are directly connected to the second power supply V2, which may be a mains power supply.

[0103] In an embodiment of the present disclosure, 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 disconnected, 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 switching between the first power supply module 1a and the energy storage module 1b is abnormal, the first power supply module 1a and the energy storage module 1b are disconnected from the first terminal 131, and the bypass power supply subunit 1112 supplies power to the first terminal 131 instead.

[0104] In an embodiment of the present disclosure, since the second power supply module 120 and the bypass power supply sub-unit 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.

[0105] In the embodiment of the present disclosure, when the first terminal 131 and the second terminal 132 are both conductively connected to the third terminal 133, the first protector, the third protector, and the control subunit 1113 can compete for action. The one with the faster response completes the action first, and the other two with the slower response may not take action. However, this does not constitute a limitation of the embodiment of the present disclosure. For example, the other two with the slower response may continue to compete. The specific decision can be made based on actual needs and is not limited here.

[0106] FIG5 schematically shows a fourth schematic diagram of the power control circuit in an embodiment of the present disclosure.

[0107] 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. The AC contactor includes a first electromagnetic coil 131 and two interlocked switches, namely a normally open switch 132 and a normally closed switch 133. The interlocking of the two switches is controlled by the electromagnetic coil. One of the two switches 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.

[0108] In the disclosed embodiments, the AC contactor is compact and can be installed on any security inspection equipment or components thereof. Furthermore, the AC contactor has minimal impact on existing circuits and features a fast response time, thereby achieving the aforementioned power supply reliability while minimizing improvement costs.

[0109] In some specific embodiments, both the first preset time and the second preset time are less than 30ms. For example, both the first preset time and the second preset time are less than 20ms. This ensures that the target device 140 does not lose power during the switching process, preventing the power failure from damaging the target device 140 or causing the security inspection equipment to stop working.

[0110] In some embodiments, the power switching module 130 satisfies at least one of the following conditions:

[0111] The lower limit of the current that the power switching module 130 can allow to pass through 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 through is 25 A. In this way, the power switching module 130 can meet the power supply current requirements of most security inspection equipment, allowing the power control circuit to adapt to more security inspection equipment (or components on security inspection equipment).

[0112] 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. Thus, the power switching module 130 can operate at a high temperature of 60° C., thereby allowing the power control circuit to operate in relatively extreme weather conditions or room temperature, thereby improving the reliability of the power control circuit.

[0113] 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 in higher humidity conditions without causing a short circuit, thereby allowing the power control circuit to operate normally in a high humidity environment.

[0114] FIG6 schematically shows a schematic diagram of a control module in an embodiment of the present disclosure.

[0115] 6 , in some embodiments, the power control circuit further includes a control module 170 connected between the third terminal 133 and the target device 140. The control module 170 is configured to: in response to a first instruction, issue a first shutdown signal to the target device 140; and, after the first shutdown signal has been issued for a first predetermined duration, disconnect the third terminal 133 from the target device 140. The first shutdown signal is configured to cause the target device 140 to perform a first shutdown operation.

[0116] In an embodiment of the present disclosure, the control module 170 includes a control unit 171 and a first switch unit 1721 connected between the third terminal 133 and the target device 140. The first switch unit 1721 is connected to the control unit 171. The control unit 171 is also connected to a second switch unit 1722, through which a user can send a first instruction to the control unit 171. Based on the first instruction, the control unit 171 can control the first switch unit 1721 to disconnect, thereby disconnecting the third terminal 133 from the target device 140. For example, the first switch unit 1721 includes an AC contactor. Alternatively, 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 (to disconnect).

[0117] Optionally, the control unit 171 is further connected to a third switch unit 1723, which may include an illuminated switch. To power the target device 140, the user must rotate the key switch 1721 (to close it) and then close the illuminated switch 1722, thereby implementing two-step control. When both the key switch 1721 and the illuminated switch 1722 are closed, the control unit 171 controls the first switch unit 1721 to conduct, thereby connecting the third terminal 133 to the target device 140, thereby powering the target device 140. This prevents false triggering and improves the power-on safety of the target device 140. For example, the illuminated switch 1722 may include a first button, and the user can click the first button to turn the illuminated switch 1722 on or off.

[0118] 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.

[0119] 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.

[0120] Optionally, before controlling the first switch unit 1721 to turn on, the control unit 171 further determines whether the third terminal 133 meets the power supply condition, for example, whether the third terminal 133 is loaded with an expected voltage. When the third terminal 133 meets the power supply condition, the control unit 171 controls the first switch unit 1721 to turn on.

[0121] In an embodiment of the present disclosure, the first preset time duration can ensure that the target device 140 (e.g., a server) completes the first shutdown operation, thereby preventing a sudden power outage from causing damage to the target device 140. For example, the first preset time duration can be set between 100 seconds and 140 seconds, for example, the first preset time duration can be set to 120 seconds.

[0122] In an embodiment of the present disclosure, the control module 170 controls the connection or disconnection between the third terminal 133 and the target device 140. Thus, when the connection between the third terminal 133 and the target device 140 is disconnected, the uninterruptible power supply 111 can continue to be powered and operate continuously, thereby preventing the uninterruptible power supply 111 from frequently turning on and off and increasing its failure rate.

[0123] With reference to Figures 4 and 6 , in some specific embodiments, the uninterruptible power supply unit 111 includes an energy storage module 1b. The energy storage module 1b can be described in the aforementioned embodiments and will not be further described here. The control module 170 is further configured to: 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 less than a preset power level, issue a first shutdown signal to the target device 140; and, after a second preset duration has elapsed since the issuance of the first shutdown signal, disconnect the third terminal 133 from the target device 140.

[0124] In the embodiment of the present disclosure, 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 a preset power level, it indicates that the power supply to the target device 140 is about to fail. Therefore, before the power fails, the control module 170 issues a first shutdown signal to cause the target device 140 to shut down in advance to prevent damage to the target device 140 caused by a sudden power outage. For example, the second preset duration can be set between 100 seconds and 140 seconds, for example, the second preset duration can be set to 120 seconds.

[0125] 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.

[0126] 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.

[0127] In some specific embodiments, the control module 170 is further connected to the uninterruptible power supply 111. The control module 170 is further configured to send a second shutdown signal to the uninterruptible power supply 111 after disconnecting the third terminal 133 from the target device 140. The second shutdown signal is configured to cause the uninterruptible power supply 111 to perform a second shutdown operation.

[0128] In an embodiment of the present disclosure, after disconnecting the third terminal 133 from the target device 140, the first switch unit 1721 can feed back an electrical signal indicating that the disconnection is complete to the control unit 171. Upon receiving the electrical signal, the control unit 171 determines that the target device 140 has been completely powered off, and then sends a second shutdown signal to the uninterruptible power supply 111. Thus, 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 a preset power level, the uninterruptible power supply 111 can be shut down while ensuring that the target device 140 has been completely shut down. This prevents the energy storage module 1b from being depleted and thus damaged, thereby protecting both the target device 140 and the uninterruptible power supply 111.

[0129] 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 automatically start.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] The embodiment of the present disclosure 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 in the event of a power failure. The response speed can be achieved within 20 to 30 ms, so that devices with high power 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 present disclosure 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 the uninterruptible power supply unit 111 is maintained or replaced, the security inspection equipment can always maintain normal operation. Finally, the power switching module 130 of the embodiment of the present disclosure can be implemented by an AC contactor, which has the characteristics of high reliability, small size, flexible installation and low cost.

[0134] Some embodiments of the present disclosure further 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 a slip ring CT device, a static CT device, and a multi-view device.

[0135] In the disclosed embodiments, a dual-safety design, formed by the uninterruptible power supply unit 111 and the power switching module 130, significantly improves power supply reliability. Furthermore, the switching between the first power supply module 110 and the second power supply module 120 is fully automatic, requiring no human intervention. The switching speed is fast, ensuring that the target device 140 will not experience power loss in this scenario. This allows the security inspection equipment to continue operating normally, significantly improving its ability to respond to sudden power failures.

[0136] It should be understood that the security inspection equipment according to the embodiment of the present disclosure has all the characteristics and advantages of the above-mentioned alignment mechanism. Please refer to the above description for details, which will not be repeated here.

[0137] Those skilled in the art will appreciate that the features described in the various embodiments of the present disclosure may be combined and / or coupled in various ways, even if such combinations and / or couplings are not explicitly described in the present disclosure. In particular, the features described in the various embodiments of the present disclosure may be combined and / or coupled in various ways without departing from the spirit and teachings of the present disclosure. All such combinations and / or couplings fall within the scope of the present disclosure.

[0138] The above describes the embodiments of the present disclosure. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Although each embodiment has been described separately above, this does not mean that the measures in each embodiment cannot be advantageously used in combination. Without departing from the scope of the present disclosure, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present disclosure.

Claims

1. A power control circuit, wherein, Comprising: A first power supply module; A second power supply module, one of the first power supply module and the second power supply module includes an uninterruptible power supply unit, and the other includes a mains power supply unit; A power supply switching module, the power supply switching module includes 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; The power supply switching module is configured to: when the power supply at the first end is abnormal, perform a first switching operation, and when the power supply at the first end resumes normal, perform a second switching operation; The first switching operation includes: disconnecting the first end from the third end, and, within a first preset time, connecting the second end to the third end; The second switching operation includes: disconnecting the second end from the third end, and, within a second preset time, connecting the first end to the third end; Wherein, 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 will not lose power.

2. The power control circuit according to claim 1, wherein, 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 a first power source, and the power control circuit further 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 source; The first isolation module is configured to: in response to a first operation of the user, isolate the first end from the uninterruptible power supply unit, 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 supply switching module is specifically configured to: when the first end is isolated from the uninterruptible power supply unit, perform the first switching operation, and when the first end is connected to the uninterruptible power supply unit, perform the second switching operation.

3. The power control circuit according to claim 2, wherein, 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 source; The first isolation module further includes: a first protector, the first protector is integrally provided with the first isolator; The first protector is configured to: when the first end is connected to the third end and the second end is connected to the third end, control the first isolator to isolate the first end from the third end.

4. The power control circuit according to claim 3, wherein, The first isolation module further includes: a second protector, the second protector is integrally provided with the second isolator; The second protector is configured to: when a preset fault occurs in the uninterruptible power supply unit, control the second isolator to isolate the uninterruptible power supply unit from the first power source, 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, wherein The power control circuit further includes a third isolator and a third protector. The third isolator is connected between the second terminal and the mains power supply unit, and the third protector is integrally provided with the third isolator; The third protector is configured to: when the second terminal and the third terminal are conducting, and the first terminal and the third terminal are conducting, control the third isolator to isolate the second terminal from the third terminal.

6. The power control circuit according to claim 5, wherein, The first isolation module includes: a first isolator and a second isolator. The first isolator is connected between the first terminal 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, and the first protector is integrally provided with the first isolator; The first protector is configured to: when the first terminal and the third terminal are conducting, and the second terminal and the third terminal are conducting, control the first isolator to isolate the first terminal from the third terminal; The response times of the third protector and the first protector are different.

7. The power control circuit according to claim 2, wherein, The uninterruptible power supply unit includes a main power supply sub-unit, a bypass power supply sub-unit, and a control sub-unit; The main power supply sub-unit is connected between the first power supply and the first terminal, the bypass power supply sub-unit is connected to the first terminal, and the control sub-unit is connected to the main power supply sub-unit and the bypass power supply sub-unit; The control sub-unit is configured to: when one of the first terminal and the second terminal is conducting with the third terminal, cause the main power supply sub-unit to supply power to the first terminal and cause the bypass power supply sub-unit to be disconnected from the first terminal; when both the first terminal and the second terminal are conducting with the third terminal, cause the main power supply sub-unit to be disconnected from the first terminal and cause the bypass power supply sub-unit to supply power to the first terminal; 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, wherein, The power switching module includes: a contactor, and the contactor includes a first electromagnetic coil, a normally open switch, and a normally closed switch; The normally open switch is connected between the first terminal and the third terminal, the first electromagnetic coil is connected between the first terminal and the normally open switch, and the normally closed switch is connected between the second terminal and the third terminal.

9. The power control circuit according to claim 1, wherein, The power control circuit further includes a control module, and the control module is connected between the third terminal and the target device; The control module is configured to: in response to a first instruction, send a first shutdown signal to the target device; After the first shutdown signal is sent for a first preset duration, disconnect the third terminal from the target device; Wherein, 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, wherein, 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 to: When both the first power supply and the second power supply lose power and the remaining power of the energy storage module is lower than a preset power, send the first shutdown signal to the target device; After the first shutdown signal is sent for a second preset duration, disconnect the third terminal from the target device.

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

12. The power control circuit according to any one of claims 1 to 11, wherein, Either the first preset time or the second preset time is less than 30 ms.

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

14. An X-ray security inspection device, wherein, Comprising the power supply control circuit according to any one of claims 1-13.

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