Delayed shutdown control circuit, control host and ship video monitoring system

Abstract

The present application relates to a delayed shutdown control circuit, a control host and a ship video surveillance system. The delayed shutdown control circuit includes a monostable trigger unit, an RC delay unit, an AC relay, a relay control unit and a switch interface. The signal end of the switch interface is respectively connected to the first input end of the relay control unit and the input end of the monostable trigger unit, the output end of the monostable trigger unit is connected to the input end of the RC delay unit, and the RC delay unit is used to trigger the host soft shutdown. The second input end of the relay control unit is used to access the reverse control signal output when the host completes the soft shutdown. The relay control unit is used to control the AC relay to shut off the power supply of the host power supply from the external AC power supply when receiving the reverse control signal and the shutdown signal of the switch interface. By adopting the hardware circuit design of the monostable trigger unit, the RC delay unit, the AC relay, the relay control unit and the switch interface, the hardware circuit controls the delayed shutdown of the host power supply, and the reliability is high.

Description

Technical Field

[0001] The invention relates to the technical field of electronic circuits, and in particular to a delayed shutdown control circuit, a control host and a ship video monitoring system. Background Art

[0002] In video surveillance systems, such as those on ships, vehicles, and satellites, the host power-off design in the control host and the integrated display and control machine usually adopts a hard power-off method, which is also called illegal shutdown mode. When the host adopts a hard power-off method, the power supply of the entire device will be cut off instantly, which often causes the host data to be lost before it can be saved and the hardware to be damaged.

[0003] At present, the method of delay control for host hard power-off on the market is to use chip control. However, in the process of realizing the present invention, the inventors found that the traditional delay control method is complex and has a high error rate. It cannot operate stably and reliably in harsh environments and cannot meet the normal working requirements of the control host and the display and control integrated machine of the video surveillance system of ships, that is, there is at least a problem of poor reliability. Summary of the invention

[0004] Based on this, it is necessary to provide a highly reliable delayed shutdown control circuit, a control host and a ship video monitoring system.

[0005] In order to achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0006] On the one hand, an embodiment of the present invention provides a delayed shutdown control circuit, including a monostable trigger unit, an RC delay unit, an AC relay, a relay control unit and a switch interface;

[0007] The signal end of the switch interface is respectively connected to the first input end of the relay control unit and the input end of the monostable trigger unit, the output end of the monostable trigger unit is connected to the input end of the RC delay unit, and the RC delay unit is used to trigger the host soft shutdown;

[0008] The second input end of the relay control unit is used to receive the reverse control signal output when the host completes soft shutdown. The relay control unit is used to control the AC relay to shut down the external AC power supply to the host power supply when receiving the reverse control signal and the shutdown signal of the switch interface.

[0009] In one embodiment, the monostable trigger unit includes a monostable RC circuit and an optocoupler isolator, the input end of the monostable RC circuit is connected to the signal end of the switch interface, and the output end of the monostable RC circuit is connected to the input end of the RC delay unit through the optocoupler isolator.

[0010] In one embodiment, the monostable RC circuit includes a resistor R1, a resistor R2, a resistor R3, a capacitor C1 and a capacitor C2;

[0011] One end of the resistor R1 is connected to the signal end of the switch interface and one end of the capacitor C1 respectively, the other end of the resistor R1 is grounded, and the other end of the capacitor C1 is connected to one end of the resistor R2;

[0012] The other end of the resistor R2 is respectively connected to one end of the resistor R3, one end of the capacitor C2 and the optocoupler isolator, and the other ends of the resistor R3 and the capacitor C2 are both grounded.

[0013] In one embodiment, the relay control unit includes an optocoupler and a MOS tube control circuit, the first input end of the MOS tube control circuit is connected to the signal end of the switch interface, the second input end of the MOS tube control circuit is used to access the reverse control signal through the optocoupler, and the output end of the MOS tube control circuit is connected to the control end of the AC relay.

[0014] In one embodiment, the AC relay is a solid state relay.

[0015] In one embodiment, an AC / DC conversion unit is further included, wherein the input end of the AC / DC conversion unit is used to connect to an external AC power source, and the output end of the AC / DC conversion unit is respectively connected to the power supply end of the relay control unit and the switch interface.

[0016] On the other hand, a control host is also provided, including a host power supply, a host mainboard and the above-mentioned delayed shutdown control circuit, the output end of the RC delay unit of the delayed shutdown control circuit is connected to the soft shutdown detection port of the host mainboard, and the reverse control port of the host mainboard is connected to the relay control unit of the delayed shutdown control circuit.

[0017] In one of the embodiments, a master control switch is further included, and the master control switch is connected to the switch interface of the delayed shutdown control circuit, and is used to trigger the switch interface to output a shutdown signal.

[0018] In one embodiment, it also includes an external interface unit, a filter and an independent graphics card, and the independent graphics card is connected to the external interface unit, the host motherboard and the host power supply respectively;

[0019] The power interface of the external interface unit is connected to the AC relay of the delayed shutdown control circuit through a filter, and the power interface of the external interface unit is used to access an external AC power supply.

[0020] On the other hand, a ship video monitoring system is also provided, comprising the above-mentioned control host.

[0021] One of the above technical solutions has the following advantages and beneficial effects:

[0022] The above-mentioned delayed shutdown control circuit, control host and ship video surveillance system adopts a hardware circuit design of a monostable trigger unit, an RC delay unit, an AC relay, a relay control unit and a switch interface. When the switch interface outputs a shutdown signal, the monostable trigger unit triggers the host motherboard to perform a soft shutdown through the RC delay unit. At this time, the relay control unit only receives the shutdown signal and does not control the AC relay to turn off the host power supply. When the host motherboard completes the soft shutdown, it will output a reverse control signal to the relay control unit, that is, the relay control unit receives the shutdown signal and the reverse control signal at the same time, and reversely controls the relay control unit to turn off the host power supply through the AC relay, thereby finally realizing the delayed hard power-off control of the host. In this way, the delayed shutdown of the host power supply can be achieved by hardware circuit control, the control method is simple and the stability is high, and the effect of high-reliability delayed control shutdown is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A first structural schematic diagram of a delayed shutdown control circuit according to an embodiment;

[0025] Figure 2 A second structural schematic diagram of a delayed shutdown control circuit according to an embodiment;

[0026] Figure 3 A schematic diagram of a monostable trigger unit circuit structure and its level timing sequence according to an embodiment;

[0027] Figure 4 A schematic diagram of the structure of a relay control unit according to an embodiment;

[0028] Figure 5 A third structural schematic diagram of a delayed shutdown control circuit of an embodiment;

[0029] Figure 6 The figure is a schematic diagram of the circuit structure of a control host according to an embodiment. DETAILED DESCRIPTION

[0030] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0032] It is understood that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. In addition, the "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc., if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0033] When used herein, it should also be understood that the terms "include / comprising" or "having" and the like specify the presence of stated features, integers, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, integers, components, parts or combinations thereof.

[0034] With the continuous development of video surveillance systems, the increase in new usage requirements and user needs, the complex and unstable traditional delay control method has gradually been unable to meet new needs. In order to facilitate the reliable transmission and distribution of centralized data, the reliable operation of the control host and the integrated display and control machine is crucial. The new control host delay control method provided by this application came into being, which can be applied to ship video surveillance systems, shore-based camp video systems and security systems, etc., and can well meet the business needs of the new era.

[0035] like Figure 1 As shown, in one embodiment, a delayed shutdown control circuit 100 is provided, including a monostable trigger unit 12, an RC delay unit 14, an AC relay 16, a relay control unit 18 and a switch interface 20. The signal end of the switch interface 20 is respectively connected to the first input end of the relay control unit 18 and the input end of the monostable trigger unit 12. The output end of the monostable trigger unit 12 is connected to the input end of the RC delay unit 14, and the RC delay unit 14 is used to trigger the host soft shutdown. The second input end of the relay control unit 18 is used to access the reverse control signal output when the host completes the soft shutdown. The relay control unit 18 is used to control the AC relay 16 to shut down the power supply of the external AC power supply 001 to the host power supply 201 when receiving the reverse control signal and the shutdown signal of the switch interface 20.

[0036] It can be understood that the monostable trigger unit 12 can adopt various types of commonly used monostable trigger devices or circuit modules in the art, and is used to detect the shutdown signal of the switch interface 20, and then generate a signal after changing from the open state to the off state, and then pass through the RC delay unit 14 to output to the host motherboard of the control host of the video surveillance system to trigger the host motherboard to perform a soft shutdown. Soft shutdown means that after the host motherboard detects the software shutdown signal (that is, the soft shutdown instruction) output by the RC delay unit 14, it will shut down the core program. The RC delay unit 14 can also be various types of RC delay devices or circuit modules commonly used in the art, and the length of its delay can be determined according to the time required for the host to complete the soft shutdown and can be achieved by selecting RC elements with corresponding parameters. The setting of the RC delay unit 14 can also be used to ensure that when the control host is restored after the external power failure, there will be no timing confusion and reliably guarantee the normal restart of the control host.

[0037] The AC relay 16 can be any type of relay in the art that can effectively avoid arcing during high-voltage switching, and is used to control the on-off of the circuit between the external AC power supply 001 and the host power supply 201 of the control host. The relay control unit 18 can be any type of MOS tube switch circuit or AND gate control circuit commonly used in the art, and can be selected according to the need for on-off control of the AC relay 16. The switch interface 20 is a switch signal interface circuit for connecting the master control switch of the control host, and is used to cooperate with the master control switch to generate a corresponding shutdown signal / power-on signal. Those skilled in the art can understand that the continuous DC power supply required by the above-mentioned relay control unit 18 and switch interface 20 during the working process can be converted from the external power supply of the control host, and the host power supply 201 is electrically connected to the host mainboard to convert the external AC power supply 001 into the working power supply of the host mainboard.

[0038] Specifically, the external AC power supply 001 is connected to the host power supply 201 through the AC relay 16, instead of the traditional external AC power supply 001 directly connected to the host power supply 201 for power supply. Therefore, the on and off of the AC relay 16 can control the on and off between the external AC power supply 001 and the host power supply 201. When the switch interface 20 outputs a shutdown signal, the relay control unit 18 and the monostable trigger unit 12 will receive the shutdown signal. At this time, the relay control unit 18 only receives the shutdown signal and will not control the AC relay 16 to cut off the connection between the external AC power supply 001 and the host power supply 201, that is, it will not cut off the power supply of the host power supply 201 to the host.

[0039] Correspondingly, after receiving the shutdown signal, the monostable trigger unit 12 will generate a level signal to the RC delay unit 14, which will be transmitted to the host motherboard through the RC delay unit 14. After the host motherboard detects the delayed level signal, it will perform a soft shutdown. When the host completes the soft shutdown (that is, after the core program is shut down), it outputs a reverse control signal (that is, a reverse control signal) to the relay control unit 18. At this time, the relay control unit 18 receives the shutdown signal and the reverse control signal at the same time, and then controls the AC relay 16 to shut off the power supply of the external AC power supply 001 to the host power supply 201, that is, shut off the power supply of the host power supply 201 to the host motherboard. In this way, when the shutdown signal of the switch interface 20 is detected, the monostable trigger unit 12 and the RC delay unit 14 are used to trigger the soft shutdown of the control host, and then the hard shutdown of the control host is realized through relay control, so that the hard shutdown of the control host is delayed by a pure hardware method, thereby better protecting important hardware such as the host hard disk and CPU, avoiding system crashes and program data loss, and protecting system safety and data security in the event of a hard shutdown of the host or a sudden power outage.

[0040] The above-mentioned delayed shutdown control circuit 100 adopts a hardware circuit design of a monostable trigger unit 12, an RC delay unit 14, an AC relay 16, a relay control unit 18 and a switch interface 20. When the switch interface 20 outputs a shutdown signal, the monostable trigger unit 12 triggers the host motherboard to perform a soft shutdown through the RC delay unit 14. At this time, the relay control unit 18 only receives the shutdown signal and does not control the AC relay 16 to shut down the host power 201. When the host motherboard completes the soft shutdown, it will output a reverse control signal to the relay control unit 18, that is, the relay control unit 18 receives the shutdown signal and the reverse control signal at the same time, and reversely controls the relay control unit 18 to shut down the host power 201 through the AC relay 16, thereby finally realizing the delayed hard power-off control of the host. In this way, the delayed shutdown of the host power 201 can be realized by hardware circuit control, the control method is simple and the stability is high, and the effect of high-reliability delayed control shutdown is achieved.

[0041] In one embodiment, Figure 2 As shown, the monostable trigger unit 12 includes a monostable RC circuit 122 and an optocoupler isolator 124. The input end of the monostable RC circuit 122 is connected to the signal end of the switch interface 20, and the output end of the monostable RC circuit 122 is connected to the input end of the RC delay unit 14 through the optocoupler isolator 124.

[0042] It can be understood that both the monostable trigger unit 12 and the RC delay unit 14 use RC devices to realize their functions, which have the characteristics of simple circuit, low cost, good stability and strong applicability, and can effectively improve the performance of the circuit. In the art, the monostable RC circuit 122 can have a variety of typical circuits to choose from, which can be specifically determined according to the required monostable performance.

[0043] Specifically, in the present embodiment, when the master control switch is disconnected, the level of the switch interface 20 flips, from a high level to a low level. As the external level changes, according to the characteristics of the monostable circuit, its level will also change from an initial state to another state, such as from a low level to a high level; at this time, the optocoupler isolator 124 is stimulated by a sudden high pulse to make the device work, and the output level of the optocoupler isolator 124 will suddenly change from a high level to a low level. The low level is output to the host motherboard after a delay by the RC delay unit 14, so that the soft shutdown detection port of the host motherboard detects the low level and triggers the execution of the soft shutdown process, thereby performing a soft shutdown. It should be noted that the above-mentioned level categories are only exemplary, and the same can be understood for the case where the software is triggered by the opposite level.

[0044] By adopting the above-mentioned monostable RC circuit 122 and optocoupler isolator 124, the soft shutdown trigger of the host motherboard can be realized through a simple and efficient RC circuit. The circuit has good stability and will not drift with changes in temperature. The optocoupler isolator 124 can effectively protect the front and rear stage circuits, ensuring the reliable and continuous operation of the system.

[0045] In one embodiment, Figure 3 As shown, the monostable RC circuit 122 includes a resistor R1, a resistor R2, a resistor R3, a capacitor C1, and a capacitor C2. One end of the resistor R1 is connected to the signal end of the switch interface 20 and one end of the capacitor C1, respectively, the other end of the resistor R1 is grounded, and the other end of the capacitor C1 is connected to one end of the resistor R2. The other end of the resistor R2 is connected to one end of the resistor R3, one end of the capacitor C2, and the optocoupler isolator 124, respectively, and the other ends of the resistor R3 and the capacitor C2 are both grounded.

[0046] It can be understood that in this embodiment, a preferred monostable RC circuit 122 is used, and the following is explained in conjunction with the monostable triggering working process: when the master control switch of the control host is disconnected, the level of the connected switch interface 20 is flipped, and changes suddenly from a high level to a low level. As the external level changes, according to the characteristics of the monostable circuit, the level of the monostable RC circuit 122 will also change from an initial state to another state, that is, from a low level to a high level. At this time, the optocoupler isolator 124 is stimulated to work due to a sudden high pulse, and the two poles of the optocoupler CE are turned on, so its level will change suddenly from a high level to a low level. After the detection port of the control host motherboard detects a low level, a soft shutdown operation will be performed.

[0047] The core device of the monostable RC circuit 122 is composed of an RC circuit, and the key device is the capacitor C1. When the level trigger causes the level at the left end of the capacitor C1 to suddenly change to a high level, according to the characteristic that the voltage at both ends of the capacitor cannot suddenly change, the voltage on the right side of the capacitor C1 also suddenly changes to a high pulse, so a high pulse is generated at the left end of the optocoupler isolator 124, and the optocoupler device works, thereby triggering the host motherboard to perform a soft shutdown operation through the RC delay unit 14. After the host completes the soft shutdown, it reversely controls the relay control unit 18 to cut off the power supply 201 of the host to complete the hard shutdown.

[0048] By adopting the above-mentioned monostable RC circuit 122, the circuit structure is simpler and has good stability, and can effectively cope with the use requirements of various harsh environments.

[0049] In one embodiment, Figure 4 As shown, the relay control unit 18 includes an optical coupler 182 and a MOS tube control circuit 184. The first input end of the MOS tube control circuit 184 is connected to the signal end of the switch interface 20, and the second input end of the MOS tube control circuit 184 is used to access the reverse control signal through the optical coupler 182. The output end of the MOS tube control circuit 184 is connected to the control end of the AC relay 16.

[0050] It can be understood that the MOS tube control circuit 184 can be any type of MOS tube control circuit 184 currently available in the art, and its function is similar to that of an AND gate. The MOS tube control circuit 184 adopts a multi-level control method of MOS tubes and triodes, and has the characteristics of simple circuit and high reliability. The MOS tube control circuit 184 realizes the on-off control of the AC relay 16 by detecting the shutdown signal of the switch interface 20 and the reverse control signal of the host reverse control. The optical coupler 182 can adopt various types of optical coupler devices in the art to realize the access of the reverse control signal and the isolation protection of the circuits on both sides, and can be selected according to the isolation protection required in the actual application.

[0051] Specifically, when the external control host is working normally, the MOS tube control circuit 184 will not detect the shutdown signal of the switch interface 20, nor will it receive the reverse control signal output by the host motherboard during reverse control. At this time, the AC relay 16 remains in the on state so that the host power supply 201 can normally obtain the power supply of the external AC power supply 001, thereby maintaining the normal power supply to the host motherboard, graphics card and other power-consuming components. When the switch interface 20 outputs a shutdown signal, the shutdown signal will be received by the MOS tube control circuit 184 and the monostable RC circuit 122 respectively. Since the MOS tube control circuit 184 only receives the shutdown signal but not the reverse control signal output by the host motherboard during reverse control, the MOS tube control circuit 184 continues to maintain the on state of the AC relay 16, so that the control host will not be shut down immediately.

[0052] At this time, the monostable RC circuit 122, the optocoupler isolator 124 and the RC delay unit 14 will trigger the host motherboard to perform a soft shutdown based on the shutdown signal. The host motherboard shuts down its core program and reversely controls the delayed shutdown control circuit 100 after the core program is shut down, that is, generates a reverse control signal (high level or low level, which can be determined according to the conduction control mode of the MOS tube control circuit 184) and outputs it to the MOS tube control circuit 184. At this time, the MOS tube control circuit 184 has received the shutdown signal and the reverse control signal at the same time. If the shutdown signal and the reverse control signal both cause the MOS tube control circuit 184 to output off, the AC relay 16 is turned off, so that the power supply path between the host power supply 201 and the external AC power supply 001 is cut off, thereby finally realizing the hard shutdown of the control host.

[0053] The time-delay shutdown control circuit 100 designed by the above-mentioned independent components adopts the monostable triggering mode design of the RC circuit, which can well avoid the problems of system crash, program data loss and hardware damage caused by the traditional hard shutdown mode without delay, and can also avoid the problems of high development cost, complex control mode and poor stability existing in the traditional delay control mode using chip control. The time-delay shutdown control circuit 100 does not need supporting program control, has strong compatibility, and is conducive to promotion and convenient application.

[0054] In one embodiment, the AC relay 16 is a solid-state relay. It is understood that in this embodiment, a solid-state relay is preferably used to directly control the shutoff of the path between the external AC power supply 001 and the host power supply 201. The AC-AC solid-state relay has the advantages of high life and high reliability. Since there are no mechanical parts in the solid-state relay, it can achieve a switching speed of milliseconds. The solid-state relay has high sensitivity and low control power, good electromagnetic compatibility, and since there is no input "coil", there is no electric shock, sparking and rebound, thus reducing electromagnetic interference and avoiding the arc generated during the high-voltage switching process. Compared with traditional ordinary electromagnetic relays that cannot meet high-voltage tests, such as ordinary electromagnetic relays that will produce sparking during high-voltage 1500V tests, which will cause the relay to melt and burn, the use of solid-state relays can effectively avoid such problems, thereby achieving the effect of significantly improving the reliability of the delayed shutdown control circuit 100.

[0055] In one embodiment, Figure 5 As shown, the delayed shutdown control circuit 100 further includes an AC / DC conversion unit 22. The input end of the AC / DC conversion unit 22 is used to connect to the external AC power supply 001, and the output end of the AC / DC conversion unit 22 is connected to the power supply end of the relay control unit 18 and the switch interface 20 respectively.

[0056] It can be understood that in this embodiment, the AC-DC conversion unit 22 is used to extract high-voltage AC power from the external AC power source 001 and convert it into low-voltage DC power to continuously power the switch interface 20 and the above-mentioned MOS tube control circuit 184. The AC-DC conversion unit 22 can adopt various types of AC-DC converters or circuit modules commonly used in the art, and the specific specifications and models can be determined according to the power supply requirements of the switch interface 20 and the relay control unit 18.

[0057] Specifically, the AC-DC conversion unit 22 is used to realize the function of converting AC220V (when facing different power grids, it can be other AC voltages) input into DC12V (when facing different power receiving devices, it can also be other DC voltages) output. The AC-DC conversion unit 22 provides continuous power supply to each power receiving unit in the delayed shutdown control circuit 100. The delayed shutdown control circuit 100 can reduce the noise interference generated by selecting imported high-quality AC-DC modules, ensure the stable output of the DC power obtained after conversion, and ensure the continuous and stable power supply of the power receiving units such as the switch interface 20 and the relay control unit 18.

[0058] By setting the above-mentioned AC-DC conversion unit 22, a stable DC power supply can be directly converted from the external AC power supply 001 to provide continuous and reliable power supply to power receiving units such as the switch interface 20 and the relay control unit 18, thereby further improving the working reliability of the delayed shutdown control circuit 100 and more effectively ensuring that the delayed shutdown control circuit 100 can reliably ensure the continuous operation and delayed shutdown control of the control host in harsh environments.

[0059] In one embodiment, Figure 6 As shown, a control host 200 is also provided, including a host power supply 201, a host mainboard 202 and the above-mentioned delayed shutdown control circuit 100. The output end of the RC delay unit 14 of the delayed shutdown control circuit 100 is connected to the soft shutdown detection port of the host mainboard 202. The reverse control port of the host mainboard 202 is connected to the relay control unit 18 of the delayed shutdown control circuit 100.

[0060] It can be understood that the specific explanation of the delayed shutdown control circuit 100 in this embodiment can be understood by referring to the corresponding explanations in the above-mentioned embodiments of the delayed shutdown control circuit 100, and will not be elaborated in this embodiment.

[0061] Specifically, the external AC power supply 001 is connected to the host power supply 201 through the AC relay 16 of the delayed shutdown control circuit 100, instead of the traditional external AC power supply 001 directly connected to the host power supply 201 for power supply. Therefore, the on and off of the AC relay 16 can control the on and off between the external AC power supply 001 and the host power supply 201. When the switch interface 20 outputs a shutdown signal, the relay control unit 18 and the monostable trigger unit 12 will receive the shutdown signal. At this time, the relay control unit 18 only receives the shutdown signal and will not control the AC relay 16 to cut off the connection between the external AC power supply 001 and the host power supply 201, that is, it will not cut off the power supply of the host power supply 201 to the host.

[0062] Correspondingly, after receiving the shutdown signal, the monostable trigger unit 12 will generate a level signal to the RC delay unit 14, which will be transmitted to the host motherboard 202 through the RC delay unit 14. After the host motherboard 202 detects the delayed level signal, it will perform a soft shutdown. When the host completes the soft shutdown (that is, after the core program is shut down), it outputs a reverse control signal (that is, a reverse control signal) to the relay control unit 18. At this time, the relay control unit 18 receives the shutdown signal and the reverse control signal at the same time, and then controls the AC relay 16 to shut off the power supply of the external AC power supply 001 to the host power supply 201, that is, shut off the power supply of the host power supply 201 to the host motherboard 202. In this way, when the shutdown signal of the switch interface 20 is detected, the monostable trigger unit 12 and the RC delay unit 14 are used to trigger the soft shutdown of the control host, and then the hard shutdown of the control host is realized through relay control, so that the hard shutdown of the control host is delayed by a pure hardware method, thereby better protecting important hardware such as the host hard disk and CPU, avoiding system crashes and program data loss, and protecting system safety and data security in the event of a hard shutdown of the host or a sudden power outage.

[0063] By applying the above-mentioned delayed shutdown control circuit 100, the control host 200 can realize a delayed hard shutdown control mechanism in which the control system first performs a soft shutdown and then cuts off the power supply by a pure hardware control method. In this way, the delayed shutdown control is realized by adopting a circuit design method of a pure hardware independent device, so that the control host 200 has the outstanding advantages of low cost, simple control method, high stability and a wide temperature range of use, such as being able to cope with stable and reliable application requirements in harsh environmental temperatures of -40°C to +70°C, and also has the characteristics of strong adaptability, strong compatibility and popularization.

[0064] In one embodiment, Figure 6 As shown, the control host 200 further includes a master control switch 203. The master control switch 203 is connected to the switch interface 20 of the delayed shutdown control circuit 100, and is used to trigger the switch interface 20 to output a shutdown signal.

[0065] It can be understood that the master switch 203, i.e., the original on / off control switch of the control host, can be directly or indirectly connected to the switch interface 20 of the delayed shutdown control circuit 100, and is used to trigger the switch interface 20 to generate a corresponding shutdown signal when manually triggered or abnormally triggered. Through the linkage between the master switch 203 and the switch interface 20 of the delayed shutdown control circuit 100, the delayed shutdown control operation of the control host 200 can be efficiently realized, thereby ensuring the reliable operation and safe hard shutdown of the control host 200.

[0066] In one embodiment, Figure 6 As shown, the control host 200 also includes an external interface unit 204, a filter 205 and an independent graphics card 206. The independent graphics card 206 is respectively connected to the external interface unit 204, the host motherboard 202 and the host power supply 201. The power interface of the external interface unit 204 is connected to the AC relay 16 of the delayed shutdown control circuit 100 through the filter 205. The power interface of the external interface unit 204 is used to access the external AC power supply 001.

[0067] It can be understood that the external interface unit 204 is an interface board equipped with the control host 200, on which a variety of interfaces are set, such as but not limited to a power interface, an HDMI interface, a VGA interface, a network port and an RS interface (such as RS485), which is used to realize the centralized wiring of the host motherboard 202, the independent graphics card 206 and the external AC power supply 001, simplify the internal wiring of the control host 200, and improve the maintainability of the control host. The filter 205 is the original power filter element of the control host 200, which is used to suppress the output interference of the external AC power supply 001 and improve the power supply stability.

[0068] By using the external interface unit 204, the filter 205, the independent graphics card 206 and the delayed shutdown control circuit 100 in coordination, it is possible to implement delayed shutdown control of the host power supply 201 of the control host 200 having the independent graphics card 206, thereby achieving a high-reliability delayed controlled shutdown effect and avoiding data loss and hardware damage to important components such as the host motherboard 202 and the independent graphics card 206.

[0069] In one embodiment, a ship video surveillance system is also provided, comprising the control host 200 mentioned above.

[0070] It can be understood that the specific explanation of the control host 200 in this embodiment can be understood by referring to the corresponding explanations in the above-mentioned embodiments of the delayed shutdown control circuit 100 and the control host 200, and will not be elaborated in this embodiment.

[0071] By applying the above-mentioned control host 200, the ship video surveillance system can effectively realize delayed shutdown control of the control host 200, avoid system crash and program data loss caused by illegal system shutdown, thereby ensuring the reliable and continuous operation of the system, and can ensure the data integrity in the ship video surveillance system for a long time, and can meet the use requirements in harsh environments.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "one of the embodiments", "another embodiment", "this embodiment", etc. means that the specific features or structures described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0073] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A delayed shutdown control circuit, characterized in that: It includes a monostable trigger unit, an RC delay unit, an AC relay, a relay control unit and a switch interface; The signal end of the switch interface is respectively connected to the first input end of the relay control unit and the input end of the monostable trigger unit, the output end of the monostable trigger unit is connected to the input end of the RC delay unit, and the RC delay unit is used to trigger the host soft shutdown; The second input end of the relay control unit is used to receive the reverse control signal output when the host completes soft shutdown. The relay control unit is used to control the AC relay to shut off the power supply of the external AC power supply to the host power supply when receiving the reverse control signal and the shutdown signal of the switch interface.

2. The delayed shutdown control circuit according to claim 1, characterized in that: The monostable trigger unit includes a monostable RC circuit and an optocoupler isolator, the input end of the monostable RC circuit is connected to the signal end of the switch interface, and the output end of the monostable RC circuit is connected to the input end of the RC delay unit through the optocoupler isolator.

3. The delayed shutdown control circuit according to claim 2, characterized in that: The monostable RC circuit includes a resistor R1, a resistor R2, a resistor R3, a capacitor C1 and a capacitor C2; One end of the resistor R1 is respectively connected to the signal end of the switch interface and one end of the capacitor C1, the other end of the resistor R1 is grounded, and the other end of the capacitor C1 is connected to one end of the resistor R2; The other end of the resistor R2 is respectively connected to one end of the resistor R3, one end of the capacitor C2 and the optocoupler isolator, and the other ends of the resistor R3 and the capacitor C2 are grounded.

4. The delayed shutdown control circuit according to any one of claims 1 to 3, characterized in that: The relay control unit includes an optocoupler and a MOS tube control circuit, wherein a first input end of the MOS tube control circuit is connected to a signal end of the switch interface, a second input end of the MOS tube control circuit is used to access the reverse control signal through the optocoupler, and an output end of the MOS tube control circuit is connected to a control end of the AC relay.

5. The delayed shutdown control circuit according to claim 4, characterized in that: The AC relay is a solid-state relay.

6. The delayed shutdown control circuit according to claim 4, characterized in that: It also includes an AC / DC conversion unit, the input end of which is used to connect to the external AC power supply, and the output end of which is respectively connected to the relay control unit and the power supply end of the switch interface.

7. A control host, characterized in that: It comprises a host power supply, a host mainboard and the delayed shutdown control circuit as described in any one of claims 1 to 6, wherein the output end of the RC delay unit of the delayed shutdown control circuit is connected to the soft shutdown detection port of the host mainboard, and the reverse control port of the host mainboard is connected to the relay control unit of the delayed shutdown control circuit.

8. The control host according to claim 7, characterized in that: It also includes a master control switch, which is connected to the switch interface of the delayed shutdown control circuit and is used to trigger the switch interface to output a shutdown signal.

9. The control host according to claim 8, characterized in that: It also includes an external interface unit, a filter and an independent graphics card, wherein the independent graphics card is connected to the external interface unit, the host motherboard and the host power supply respectively; The power interface of the external interface unit is connected to the AC relay of the delayed shutdown control circuit through the filter, and the power interface of the external interface unit is used to access an external AC power supply.

10. A ship video surveillance system, characterized in that: A control host comprising any one of claims 7 to 9.

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