阅读说明：本技术 延时关机控制电路、控制主机和船舶视频监视系统 (Delayed shutdown control circuit, control host and ship video monitoring system ) 是由 黄志通 符向斌 陈澍杨 方楠生 张瑞应 于 2020-07-01 设计创作，主要内容包括：本申请涉及一种延时关机控制电路、控制主机和船舶视频监视系统,延时关机控制电路包括单稳态触发单元、RC延时单元、交流继电器、继电控制单元和开关接口。开关接口的信号端分别连接继电控制单元的第一输入端和单稳态触发单元的输入端,单稳态触发单元的输出端连接RC延时单元的输入端,RC延时单元用于触发主机软关机。继电控制单元的第二输入端用于接入主机完成软关机时输出的反控信号。继电控制单元用于接收到反控信号和开关接口的关机信号时,控制交流继电器关断外部交流电源对主机电源的供电。通过采用单稳态触发单元、RC延时单元、交流继电器、继电控制单元和开关接口的硬件电路设计,由硬件电路控制主机电源延时关闭,可靠性较高。(The application relates to a delay shutdown control circuit, a control host and a ship video monitoring system. The signal end of the switch interface is respectively connected with 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 with the input end of the RC delay unit, and the RC delay unit is used for triggering the soft shutdown of the host. And a second input end of the relay control unit is used for accessing an inverse control signal output by the host machine when the soft shutdown is completed. And the relay control unit is used for controlling the alternating current relay to cut off the power supply of the external alternating current power supply to the host power supply when receiving the inverse 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 alternating current relay, the relay control unit and the switch interface, the hardware circuit controls the delayed closing of the host power supply, and the reliability is high.)

1. A delay shutdown control circuit is characterized by comprising a monostable trigger unit, an RC delay unit, an alternating current relay, a relay control unit and a switch interface;

the signal end of the switch interface is respectively connected with 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 with the input end of the RC delay unit, and the RC delay unit is used for triggering the soft shutdown of the host;

the second input end of the relay control unit is used for accessing an inverse control signal output by the host when the host finishes soft shutdown, and the relay control unit is used for receiving the inverse control signal and the shutdown signal of the switch interface and controlling the alternating current relay to cut off the power supply of an external alternating current power supply to the host power supply.

2. The delayed shutdown control circuit of claim 1, wherein the monostable trigger unit comprises a monostable RC circuit and an optical coupler isolator, an input end of the monostable RC circuit is connected to the signal end of the switch interface, and an output end of the monostable RC circuit is connected to an input end of the RC delay unit through the optical coupler isolator.

3. The delayed shutdown control circuit of claim 2, wherein 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 connected with a 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 with one end of the resistor R2;

the other end of the resistor R2 is respectively connected with one end of the resistor R3, one end of the capacitor C2 and the optical coupler isolator, and the other ends of the resistor R3 and the capacitor C2 are both grounded.

4. The delayed shutdown control circuit according to any one of claims 1 to 3, wherein the relay control unit includes an optical coupler and an MOS pipe control circuit, a first input end of the MOS pipe control circuit is connected to the signal end of the switch interface, a second input end of the MOS pipe control circuit is used for accessing the inverse control signal through the optical coupler, and an output end of the MOS pipe control circuit is connected to the control end of the AC relay.

5. The delayed shutdown control circuit of claim 4, wherein the AC relay is a solid state relay.

6. The delayed shutdown control circuit according to claim 4, further comprising an ac/dc conversion unit, wherein an input end of the ac/dc conversion unit is used for connecting the external ac power supply, and an output end of the ac/dc conversion unit is respectively connected to the relay control unit and a power supply end of the switch interface.

7. A control host computer, characterized by, including host computer power, host computer mainboard and claim 1 to 6 any one the time delay shutdown control circuit, the output of RC time delay unit of time delay shutdown control circuit connects the soft shutdown detection mouth of host computer mainboard, the reverse control mouth of host computer mainboard connects the relay control unit of time delay shutdown control circuit.

8. The control host according to claim 7, further comprising a master control switch, wherein the master control switch is connected to the switch interface of the delayed shutdown control circuit, and is configured to trigger the switch interface to output a shutdown signal.

9. The control host of claim 8, further comprising an external interface unit, a filter and an independent graphics card, wherein the independent graphics card is respectively connected to the external interface unit, the host motherboard and the host power supply;

and the power interface of the external interface unit is connected with the alternating current relay of the delay shutdown control circuit through the filter, and is used for being connected with an external alternating current power supply.

10. A video surveillance system for a marine vessel, comprising a control host according to any one of claims 7 to 9.

Technical Field

The invention relates to the technical field of electronic circuits, in particular to a delay shutdown control circuit, a control host and a ship video monitoring system.

Background

In a video monitoring system, for example, a video monitoring system of a ship, a vehicle, a satellite, and the like, a hard power-off mode is generally adopted for a power-off design of a host in a control host and a display control all-in-one machine, and the power-off mode is also called an illegal shutdown mode. When the host adopts a hard power-off method, all power supplies of the whole equipment are cut off at the moment of power-off, and host data are often lost due to too long time for storage and hardware damage are often caused.

At present, a mode of carrying out delay control on hard power failure of a host computer in the market is a mode of adopting chip control, however, in the process of realizing the invention, the inventor finds that the traditional delay control mode is complex in control mode, high in error rate, incapable of running stably and reliably in a severe environment, incapable of meeting the normal working requirements of a control host computer and a display and control integrated machine of a video monitoring system such as a ship and the like, and at least has the problem of poor reliability.

Disclosure of Invention

In view of the above, there is a need to provide a highly reliable delayed shutdown control circuit, a control host and a video surveillance system for a ship.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

on one hand, the embodiment of the invention provides a delay shutdown control circuit, which comprises a monostable trigger unit, an RC delay unit, an alternating current relay, a relay control unit and a switch interface;

the signal end of the switch interface is respectively connected with 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 with the input end of the RC delay unit, and the RC delay unit is used for triggering the soft shutdown of the host;

the second input end of the relay control unit is used for accessing an inverse control signal output by the host when the host finishes soft shutdown, and the relay control unit is used for controlling the alternating current relay to cut off the power supply of the external alternating current power supply to the host when receiving the inverse control signal and the shutdown signal of the switch interface.

In one embodiment, the monostable trigger unit comprises a monostable RC circuit and an optical coupler isolator, wherein the input end of the monostable RC circuit is connected with the signal end of the switch interface, and the output end of the monostable RC circuit is connected with the input end of the RC delay unit through the optical coupler isolator.

In one embodiment, 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 with 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 with one end of the resistor R2;

the other end of the resistor R2 is respectively connected with one end of a resistor R3, one end of a capacitor C2 and the optical coupler isolator, and the other ends of the resistor R3 and the capacitor C2 are both grounded.

In one embodiment, the relay control unit comprises an optical coupler and an MOS tube control circuit, a first input end of the MOS tube control circuit is connected with a signal end of the switch interface, a second input end of the MOS tube control circuit is used for accessing the inverse control signal through the optical coupler, and an output end of the MOS tube control circuit is connected with a control end of the alternating current relay.

In one embodiment, the ac relay is a solid state relay.

In one embodiment, the power supply further comprises an alternating current-direct current conversion unit, an input end of the alternating current-direct current conversion unit is used for being connected with an external alternating current power supply, and an output end of the alternating current-direct current conversion unit is respectively connected with a relay control unit and a power supply end of the switch interface.

On the other hand, the control host comprises a host power supply, a host mainboard and the delayed shutdown control circuit, wherein the output end of the RC delay unit of the delayed shutdown control circuit is connected with the soft shutdown detection port of the host mainboard, and the reverse control port of the host mainboard is connected with the relay control unit of the delayed shutdown control circuit.

In one embodiment, the system further comprises a master control switch, wherein the master control switch is connected with the switch interface of the delay shutdown control circuit and is used for triggering the switch interface to output a shutdown signal.

In one embodiment, the system further comprises an external interface unit, a filter and an independent display card, wherein the independent display card is respectively connected with the external interface unit, the host mainboard and the host power supply;

the power interface of the external interface unit is connected with the alternating current relay of the delay shutdown control circuit through the filter, and the power interface of the external interface unit is used for being connected with an external alternating current power supply.

In another aspect, a ship video monitoring system is also provided, which comprises the control host.

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

according to the time-delay shutdown control circuit, the control host and the ship video monitoring system, by adopting the hardware circuit design of the monostable trigger unit, the RC time-delay unit, the alternating current relay, the relay control unit and the switch interface, when the switch interface outputs a shutdown signal, the monostable trigger unit triggers the host mainboard to perform soft shutdown through the RC time-delay unit, and at the moment, the relay control unit only receives the shutdown signal and cannot control the alternating current relay to shut off the host power supply. When the main board of the host machine finishes soft shutdown, the reverse control signal is output to the relay control unit, so that the relay control unit receives the shutdown signal and the reverse control signal at the same time, and the reverse control relay control unit shuts down the power supply of the host machine through the alternating current relay, thereby finally realizing the delayed hard shutdown control of the host machine. Therefore, the delayed shutdown of the power supply of the host can be realized under the control of a hardware circuit, the control mode is simple, the stability is higher, and the effect of high-reliability delayed shutdown control is achieved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a diagram illustrating a first structure of a delayed shutdown control circuit according to an embodiment;

FIG. 2 is a second schematic diagram of the delayed shutdown control circuit according to an embodiment;

FIG. 3 is a schematic diagram of a monostable flip-flop circuit configuration and its level timing according to an embodiment;

fig. 4 is a schematic structural diagram of a relay control unit according to an embodiment;

FIG. 5 is a diagram illustrating a third exemplary embodiment of a delayed shutdown control circuit;

fig. 6 is a schematic circuit diagram of a control host according to an embodiment.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. In addition, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if the connected circuits, modules, units, or the like have transmission of electrical signals or data therebetween.

As used herein, it is also to be understood that the terms "comprises/comprising" or "having," etc., specify the presence of stated features, integers, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, components, parts, or combinations thereof.

With the continuous development of video surveillance systems, new use requirements and user requirements increase, and the complicated and unstable conventional delay control method has been unable to meet the new requirements. In order to facilitate reliable transmission and distribution of centralized data, the reliable operation of the control host and the display and control integrated machine is crucial, the novel control host delay control mode provided by the application is developed, can be applied to scenes such as a ship video monitoring system, a shore-based operation area video system and a security system, and can well meet the service requirements in a new period.

As shown in fig. 1, in one embodiment, a delayed shutdown control circuit 100 is provided, which includes 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 terminal of the switch interface 20 is connected to the first input terminal of the relay control unit 18 and the input terminal of the monostable trigger unit 12, respectively. 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 for triggering the host soft-off. A second input end of the relay control unit 18 is used for accessing an inverse control signal output by the host when the soft shutdown is completed. The relay control unit 18 is configured to control the ac relay 16 to turn off the power supplied from the external ac power supply 001 to the host power supply 201 when receiving the inverse control signal and the shutdown signal of the switch interface 20.

It can be understood that the monostable trigger unit 12 may adopt various types of monostable trigger devices or circuit modules commonly used in the art, and is configured to generate a signal after the switch interface 20 is turned off from the on state when detecting the shutdown signal, and output the signal to the host motherboard of the control host of the video monitoring system after passing through the RC delay unit 14, so as to trigger the host motherboard to perform soft shutdown. The soft-off means that the host motherboard closes the kernel program after detecting a software shutdown signal (i.e., a soft-off instruction) output by the RC delay unit 14. The RC delay unit 14 may also be various types of RC delay devices or circuit modules commonly used in the art, and the delay duration may be determined according to the time required by the host to complete soft-off and implemented by selecting RC elements with corresponding parameters. The RC delay unit 14 can also be used to ensure that the normal restart of the control host is reliably ensured without time sequence confusion when the control host recovers power after external power failure.

The ac relay 16 may be any type of relay in the art capable of effectively preventing an arc from being generated during a high voltage switching process, and is used to control the on/off of a circuit between the external ac power supply 001 and the host power supply 201 of the host. The relay control unit 18 may be various MOS transistor switching circuits or and gate control circuits commonly used in the art, and may be specifically selected according to the on-off control requirement of the ac relay 16. The switch interface 20 is a switch signal interface circuit for connecting a master control switch of the control host, and is used for generating a corresponding shutdown signal/startup signal in cooperation with the master control switch. Those skilled in the art will understand that the continuous dc power supply required by the relay control unit 18 and the switch interface 20 during the operation process can be converted from an external power supply of the control host, and the host power supply 201 is electrically connected to the host motherboard for converting the external ac power supply 001 into an operating power supply of the host motherboard.

Specifically, the external ac power supply 001 is connected to the main unit power supply 201 via the ac relay 16, instead of the conventional external ac power supply 001 directly connected to the main unit power supply 201 to supply power. Therefore, the on/off of the ac relay 16 controls the on/off of the external ac power supply 001 and the main power supply 201. When the switch interface 20 outputs a shutdown signal, the relay control unit 18 and the monostable trigger unit 12 both receive the shutdown signal, and at this time, the relay control unit 18 does not control the ac relay 16 to turn off the connection between the external ac power supply 001 and the host power supply 201 only by receiving the shutdown signal, that is, does not turn off the power supply of the host power supply 201 to the host.

Correspondingly, after receiving the shutdown signal, the monostable trigger unit 12 generates a level signal to the RC delay unit 14, and transmits the level signal to the host motherboard through the RC delay unit 14, and the host motherboard performs soft shutdown after detecting the delayed level signal. When the host completes the soft shutdown (i.e., after the kernel is shut down), the host outputs a reverse control signal (i.e., a reverse control signal) to the relay control unit 18. The relay control unit 18 receives the shutdown signal and the reverse control signal at the same time, and 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, to shut off the power supply of the host power supply 201 to the host motherboard. Therefore, when a shutdown signal of the switch interface 20 is detected, after the monostable trigger unit 12 and the RC delay unit 14 trigger the control host to complete soft shutdown, the control host is then turned off in a hard mode through relay control, and the control host is turned off in a delay mode in a pure hardware mode, so that important hardware such as a host hard disk and a CPU is well protected, system crash and program data loss are avoided, and system safety and data safety under the condition of hard shutdown or sudden power failure of the host are protected.

In the above time-delay shutdown control circuit 100, by adopting the hardware circuit design of the monostable trigger unit 12, the RC delay unit 14, the ac relay 16, the relay control unit 18, and the switch interface 20, when the switch interface 20 outputs a shutdown signal, the monostable trigger unit 12 triggers the host motherboard to perform soft shutdown through the RC delay unit 14, and 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 supply 201. When the main board of the host computer completes soft shutdown, the reverse control signal is output 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 the reverse control relay control unit 18 turns off the main power supply 201 through the ac relay 16, so that the delayed hard power-off control of the host computer is finally realized. Therefore, the delayed shutdown of the host power supply 201 can be realized under the control of a hardware circuit, the control mode is simple, the stability is high, and the effect of high-reliability delayed shutdown control is achieved.

In one embodiment, as shown in fig. 2, the monostable trigger unit 12 includes a monostable RC circuit 122 and an opto-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.

It can be understood that both the monostable trigger unit 12 and the RC delay unit 14 adopt RC devices to realize their functions, and have the characteristics of simple circuit, low cost, good stability and strong applicability, and can effectively improve the performance of the circuit. There are a number of typical circuit options available in the art for the monostable RC circuit 122, which can be determined based on the desired monostable performance.

Specifically, in this embodiment, when the master switch is turned off, the level of the switch interface 20 is inverted and suddenly changed from the high level to the low level. Due to the change of the external level, the level of the monostable circuit also changes from an initial state to another state according to the characteristics of the monostable circuit, such as sudden change from a low level to a high level; at this time, the optical coupler isolator 124 is excited by a burst high pulse to make the device work, and the output level of the optical coupler isolator 124 suddenly changes from the high level to the low level. The low level is delayed by the RC delay unit 14 and then output to the host motherboard, so that the soft-off detection port of the host motherboard triggers the execution of the soft-off process after detecting the low level, thereby performing soft-off. It should be noted that the above-mentioned level categories are merely exemplary, and the situation where the opposite level triggering software is adopted can be understood in a similar manner.

By adopting the monostable RC circuit 122 and the optical coupler isolator 124, soft-off triggering of the main board of the host can be realized through a simple and efficient RC circuit, the circuit has better stability, deviation can not occur along with temperature change, the optical coupler isolator 124 can effectively protect a front-stage circuit and a rear-stage circuit, and reliable continuous operation of the system is guaranteed.

In one embodiment, as shown in fig. 3, 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, 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 with one end of the resistor R3, one end of the capacitor C2 and the optical coupler isolator 124, and the other ends of the resistor R3 and the capacitor C2 are both grounded.

It will be appreciated that a preferred monostable RC circuit 122 is employed in this embodiment, and the following description is made in conjunction with the monostable trigger operation: when the master control switch of the control host is switched off, the level of the connected switch interface 20 is inverted and suddenly changed from high level to low level. Due to the change of the external level, the level of the monostable RC 122 also changes from the initial state to another state, i.e., changes from low level to high level abruptly, according to the characteristics of the monostable. At this time, the optocoupler isolator 124 is excited to operate due to a burst high pulse, and the two poles of the optocoupler CE are conducted, so that the level of the optocoupler CE suddenly changes from a high level to a low level. And after the detection port of the main board of the control host detects the low level, the soft shutdown operation is carried out.

The core device in monostable RC circuit 122 comprises the RC circuit, and the key device is electric capacity C1, when level trigger arouses electric capacity C1 left end level sudden change to the high level, according to the characteristic that the voltage at electric capacity both ends can not be suddenly changed, electric capacity C1 right side voltage also follows the sudden change to the high pulse, so opto-isolator 124 left end can produce a high pulse, and opto-coupler device work, and then triggers the host computer mainboard through RC delay unit 14 and carry out soft shutdown operation. After the host finishes the soft shutdown, the relay control unit 18 is reversely controlled to cut off the power supply 201 of the host, and the hard shutdown is finished.

By adopting the monostable RC circuit 122, the circuit structure is simpler and good in stability, and various severe environment use requirements can be efficiently met.

In one embodiment, as shown in fig. 4, the relay control unit 18 includes an optical coupler 182 and a MOS transistor control circuit 184. A first input end of the MOS transistor control circuit 184 is connected to the signal end of the switch interface 20, and a second input end of the MOS transistor control circuit 184 is used for accessing an inverse control signal through the optical coupler 182. The output end of the MOS transistor control circuit 184 is connected to the control end of the ac relay 16.

It is understood that the MOS transistor control circuit 184 may be any type of MOS transistor control circuit 184 known in the art, and functions similarly to the and gate. The MOS transistor control circuit 184 adopts a multistage control mode of MOS transistors and triodes, and has the characteristics of simple circuit and high reliability. The MOS transistor control circuit 184 controls the on/off of the ac relay 16 by detecting a shutdown signal of the switch interface 20 and an inverse control signal of the host reverse control. The optocoupler 182 may be an optocoupler device of any type in the art, and is configured to implement access of an inverted control signal and isolation protection of circuits on two sides, and may specifically be selected according to isolation protection requirements required in practical applications.

Specifically, when the external control host normally works, the MOS tube control circuit 184 does not detect the shutdown signal of the switch interface 20, and does not receive the reverse control signal output by the host motherboard during reverse control, and 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, and thus maintain the normal power supply to the power consuming components such as the host motherboard, the graphics card, and the like. When the shutdown signal is output from the switch interface 20, the shutdown signal is received by the MOS transistor control circuit 184 and the monostable RC circuit 122, and since the MOS transistor control circuit 184 only receives the shutdown signal at this time and does not have the inverse control signal output when the host motherboard performs inverse control, the MOS transistor control circuit 184 still keeps the on state of the ac relay 16, so that the host is controlled not to be shut down immediately.

At this time, the monostable RC circuit 122, the optocoupler isolator 124 and the RC delay unit 14 trigger the host motherboard to perform soft shutdown based on the shutdown signal. The host motherboard turns off the core program and reversely controls the delayed shutdown control circuit 100 after the core program is turned off, that is, generates a reverse control signal (a high level or a low level, which may be specifically determined according to the conduction control manner of the MOS transistor control circuit 184) and outputs the reverse control signal to the MOS transistor control circuit 184. At this time, the MOS transistor control circuit 184 has received the shutdown signal and the inverse control signal at the same time, and if the shutdown signal and the inverse control signal both cause the MOS transistor control circuit 184 to output shutdown, 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 implementing a hard shutdown of the control host.

Through the delay shutdown control circuit 100 designed by each independent device, the monostable trigger mode design of the RC circuit is adopted, so that the problems of system running, program data loss and hardware damage caused by the traditional delay-free hard shutdown mode can be well avoided, and the problems of high development cost, complex control mode, poor stability and the like existing in the traditional chip-controlled delay control mode can be avoided. The delayed shutdown control circuit 100 does not need to be controlled by a matched program, has strong compatibility and is beneficial to popularization and convenient application.

In one embodiment, the ac relay 16 is a solid state relay. It is understood that in the present embodiment, it is preferable to use a solid-state relay to directly control the turn-off 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 long service life and high reliability, and can reach the switching speed of millisecond level because no mechanical parts are arranged in the solid-state relay. The solid-state relay has high sensitivity, small control power and good electromagnetic compatibility, and because no 'coil' is input and no electric spark and rebound occur, the electromagnetic interference is reduced, and the electric arc generated in the high-voltage switching process is avoided. Compared with the conventional common electromagnetic relay which cannot meet the high-voltage test, if the common electromagnetic relay can generate a fire fox phenomenon during the high-voltage 1500V test, the situation that the relay is melted and burnt is further caused, the solid-state relay can effectively avoid the problems, and therefore the effect of remarkably improving the reliability of the delayed shutdown control circuit 100 is achieved.

In one embodiment, as shown in fig. 5, the delayed-off control circuit 100 further includes an ac-dc converting unit 22. The input end of the ac/dc conversion unit 22 is used for connecting an external ac power supply 001, and the output end of the ac/dc conversion unit 22 is connected to the power supply ends of the relay control unit 18 and the switch interface 20, respectively.

It is understood that, in the present embodiment, the ac/dc conversion unit 22 is used to extract high-voltage ac power from the external ac power source 001 and convert the high-voltage ac power into low-voltage dc power to continuously supply power to the switch interface 20 and the MOS transistor control circuit 184. The AC-DC conversion unit 22 may adopt various types of AC-DC converters or circuit modules commonly used in the art, and the specific specification and model may be determined according to the power supply needs of the switch interface 20 and the relay control unit 18.

Specifically, the AC/DC conversion unit 22 is used to realize a function of converting an input AC220V (which may be an AC voltage of another magnitude when facing different power grids) into an output DC12V (which may be a DC voltage of another magnitude when facing different power receiving devices). The ac/dc conversion unit 22 supplies continuous power to each power receiving unit in the delayed-off control circuit 100. The delayed shutdown control circuit 100 can reduce noise interference generated by selecting an imported high-quality AC-DC module, ensure stable output of the converted DC power supply, and ensure continuous and stable power supply of the power receiving units such as the switch interface 20 and the relay control unit 18.

By arranging the alternating current-direct current conversion unit 22, a stable DC power supply can be obtained by directly converting the external alternating current power supply 001, so as to provide continuous and reliable power supply for the 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 the delayed shutdown control of the control host in a severe environment.

In one embodiment, as shown in fig. 6, there is further provided a control host 200, which includes a host power supply 201, a host motherboard 202, and the aforementioned delayed shutdown control circuit 100. The output end of the RC delay unit 14 of the delay shutdown control circuit 100 is connected to the soft shutdown detection port of the host motherboard 202. The reverse control port of the host motherboard 202 is connected to the relay control unit 18 of the delayed shutdown control circuit 100.

It can be understood that, for the specific explanation of the delayed-off control circuit 100 in this embodiment, reference may be made to the corresponding explanations in the embodiments of the delayed-off control circuit 100 for understanding in the same manner, and details are not repeated in this embodiment.

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 conventional external ac power supply 001 directly connected to the host power supply 201 for supplying power. Therefore, the on/off of the ac relay 16 controls the on/off of the external ac power supply 001 and the main power supply 201. When the switch interface 20 outputs a shutdown signal, the relay control unit 18 and the monostable trigger unit 12 both receive the shutdown signal, and at this time, the relay control unit 18 does not control the ac relay 16 to turn off the connection between the external ac power supply 001 and the host power supply 201 only by receiving the shutdown signal, that is, does not turn off the power supply of the host power supply 201 to the host.

Correspondingly, after receiving the shutdown signal, the monostable trigger unit 12 generates a level signal to the RC delay unit 14, and transmits the level signal to the host motherboard 202 through the RC delay unit 14, and the host motherboard 202 performs a soft shutdown after detecting the delayed level signal. When the host completes the soft shutdown (i.e., after the kernel is shut down), the host outputs a reverse control signal (i.e., a reverse control signal) to the relay control unit 18. The relay control unit 18 receives the shutdown signal and the reverse control signal at the same time, and 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, to shut off the power supply of the host power supply 201 to the host motherboard 202. Therefore, when a shutdown signal of the switch interface 20 is detected, after the monostable trigger unit 12 and the RC delay unit 14 trigger the control host to complete soft shutdown, the control host is then turned off in a hard mode through relay control, and the control host is turned off in a delay mode in a pure hardware mode, so that important hardware such as a host hard disk and a CPU is well protected, system crash and program data loss are avoided, and system safety and data safety under the condition of hard shutdown or sudden power failure of the host are protected.

By applying the above-mentioned delayed shutdown control circuit 100, the control host 200 can implement a pure hardware control mode to implement a delayed hard shutdown control mechanism in which the control system performs a soft shutdown first and then powers off the power supply. Therefore, the delay shutdown control is realized by adopting a circuit design mode of pure hardware independent devices, so that the control host 200 has the outstanding advantages of low cost, simple control mode, high stability and wide temperature use range, and has the characteristics of strong adaptability, strong compatibility and popularization and application if the control host can meet the stable and reliable application requirements under severe environment temperature of-40 ℃ to +70 ℃.

In one embodiment, as shown in FIG. 6, the control host 200 further includes a grandmaster switch 203. The master control switch 203 is connected to the switch interface 20 of the delayed shutdown control circuit 100, and is configured to trigger the switch interface 20 to output a shutdown signal.

It can be understood that the master control switch 203, that is, the original on-off control switch of the control host, may be directly or indirectly connected to the switch interface 20 of the delayed shutdown control circuit 100, and is configured to trigger the switch interface 20 to generate a corresponding shutdown signal when being triggered manually or abnormally. Through the linkage of the master control 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 the safe hard shutdown of the control host 200.

In one embodiment, as shown in fig. 6, the control host 200 further includes an external interface unit 204, a filter 205, and a separate display card 206. The independent display card 206 is respectively connected with the external interface unit 204, the host mainboard 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 for accessing an external ac power supply 001.

It can be understood that the external interface unit 204 is an interface board equipped for the control host 200, and is provided with a plurality of interfaces, such as but not limited to a power interface, an HDMI interface, a VGA interface, a network interface, and an RS interface (e.g., RS485), for realizing centralized wiring of the host motherboard 202, the independent graphics card 206, and the external ac power supply 001, simplifying internal wiring of the control host 200, and improving maintainability of the control host. The filter 205 is an original power filter element of the control host 200, and is used to suppress output interference of the external ac power supply 001 and improve power supply stability.

Through the above-mentioned external interface unit 204, the filter 205, the independent graphics card 206 and the delayed shutdown control circuit 100, the delayed shutdown control of the host power supply 201 of the control host 200 with the independent graphics card 206 can be realized, so as to achieve the effect of high-reliability delayed shutdown control, and avoid data loss and hardware damage of important components such as the host motherboard 202 and the independent graphics card 206.

In one embodiment, a video surveillance system for a ship is also provided, which includes the above-mentioned control host 200.

It can be understood that, for the specific explanation of the control host 200 in this embodiment, reference may be made to the corresponding explanations in the embodiments of the delayed shutdown control circuit 100 and the control host 200 for the same reason, and details are not repeated in this embodiment.

By applying the control host 200, the ship video monitoring system can effectively realize the delayed shutdown control of the control host 200, and avoid system crash and program data loss caused by illegal shutdown of the system, thereby ensuring the reliable and continuous operation of the system, ensuring the data integrity in the ship video monitoring system for a long time and meeting the use requirements under severe environment.

In the description herein, reference to the description of the terms "one embodiment," "one of the embodiments," "another embodiment," and "the embodiment," etc., means that a particular feature or structure described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.