CN105527907B - Energy-saving control method and energy-saving control device for video monitoring system - Google Patents

Abstract

An energy-saving control method and an energy-saving control device for a video monitoring system, belonging to the field of energy-saving control. Through the cooperation of the first control unit and the second control unit, it only provides working power for the selected camera and its corresponding lighting lamp, and only provides standby power for the unselected camera and its corresponding lighting lamp. It is in a soft-off state; on the premise of not hindering the monitor at the monitoring end from observing the on-site monitoring image, the start-up method of the thyristor zero-crossing trigger circuit is used to prevent equipment failure caused by traditional start-up and/or failure to interfere with other equipment through the power grid , so as to truly achieve the ultimate goal of saving energy consumption and prolonging the service life of cameras and lighting equipment. The invention can be widely used in the field of design and manufacture of video surveillance devices.

Description

Energy-saving control method and energy-saving control device for video monitoring system

technical field

The invention belongs to the field of energy-saving control, and in particular relates to an energy-saving control method and an energy-saving control device for a video monitoring system.

Background technique

At present, the application of industrial TV monitoring system in industrial and mining enterprises is very popular, providing effective real-time monitoring means for the production process of enterprises.

The basic composition of commonly used industrial TV systems is composed of cameras, monitors, control systems, transmission lines and other equipment. Its system architecture is shown in Figure 1. In practical applications, there are "1 to 1" (1 camera 1 monitor), "1 to many" (1 camera connected to multiple monitors), "many to 1" (multiple cameras connected to 1 monitor) and other system architecture methods. The application of the "many to 1" method mainly refers to the fact that multiple cameras are installed on site to transmit the signals to the input end of the video switcher in the operating room through the transmission line, and then transmit the signal from the output end of the video distributor to the monitor.

In the existing industrial TV system, when switching the actual monitoring screen, the production operator selects the monitoring screen to be watched by controlling the selection key on the video switcher. While the production operators are watching the monitoring screen, other industrial TV systems (including cameras and corresponding lights, etc.) are still in working condition, the power required by the cameras and lights is constantly Ageing.

The authorized announcement date is April 20, 2011, and the authorized announcement number is CN 201805589U Chinese utility model patent, which discloses a "lighting dimming and energy saving system based on video monitoring", which includes video monitoring cameras and regional front controllers , an intelligent dimming master controller, a dimming power supply driver and a lighting lamp, characterized in that the regional front controller and the monitoring computer are respectively connected to the intelligent dimming master controller, and the regional front controller is also respectively connected to a video surveillance camera and The dimming power driver is connected to the lighting lamp. It adopts video surveillance cameras to collect on-site status information in the monitoring area, automatically dims and controls the lighting in the controlled area, and can automatically reduce the lighting brightness to achieve energy saving in the middle of the night or when there are no vehicles or pedestrians on remote roads. It is suitable for urban roads And highway tunnel lighting energy-saving control. This technical solution mainly provides a means of automatic dimming for lighting lamps, but it cannot realize personalized energy-saving control for the working status and monitoring requirements of different power switch signals in the video surveillance system, and it is necessary to extract the illuminance in the video signal For light control, there are many hardware circuit devices, complex software, and high cost. When used in an environment with complex industrial illumination, the reliability of its work cannot be improved.

Contents of the invention

The technical problem to be solved by the present invention is to provide an energy-saving control method and an energy-saving control device for a video surveillance system, which adopts the closed-loop control technology of current detection load characteristics, and controls different power switches in the video surveillance system according to changes in monitoring requirements. The working state of the signal is switched to realize energy-saving control. On the premise of ensuring the normal use of the video surveillance system, it not only reduces the power consumption required by the camera and lighting, and avoids energy waste; service life of the equipment.

The technical solution of the present invention is to provide an energy-saving control method for a video system, wherein the video monitoring system includes a plurality of cameras for shooting images of each monitoring site, and the image signal output terminals of each camera, Through the matching video distributor, they are respectively transmitted to the corresponding video signal input end of a video switcher, and the video signal output end of the video switcher is connected with the video signal input of a monitor arranged in the main operating room. The corresponding connection of the terminals; through the switching of the video signal of each camera by the video switcher, the display respectively accepts the video image signal of each camera; A lighting lamp for monitoring on-site lighting; it is characterized in that the energy-saving control method includes:

1) A first control unit is set in the main operating room, which is used to provide production personnel with a choice of switching video image signals between each camera and the display;

2) Set a second control unit in the on-site electrical cabinet or the special video system electrical control box that provides power for each camera and lighting lamp, to control the on/off and standby state operation of the power supply of the camera and the lighting lamp;

3) Between the AC power supply in the on-site electrical cabinet or the special video system electrical control box and the power input terminals of each camera and lighting lamp, a thyristor zero-crossing trigger circuit is correspondingly set up to control each On/standby/off of the working power of the camera and lighting lamp;

4) In the first control unit, collect the selected camera number according to the switching operation of the production personnel;

5) The first control unit transmits the selected camera number to the second control unit;

6) For the selected camera and its corresponding lighting, the second control unit outputs a thyristor trigger signal, and by controlling the conduction angle of the corresponding thyristor zero-crossing trigger circuit, the selected camera and Its corresponding lighting lamp provides digitally quantized AC power, so that the selected camera and its corresponding lighting lamp can work normally;

7) For unselected cameras and their corresponding lighting lamps, the second control unit outputs a thyristor trigger signal, and by controlling the conduction angle of the corresponding thyristor zero-crossing trigger circuit, the selected camera It and its corresponding lighting lamps provide digitally quantized micro-current AC power, and provide standby AC power for the unselected cameras and their corresponding lighting lamps through the protective capacitors connected in parallel at both ends of the thyristor, so that the selected The camera and its corresponding light are in standby state;

8) Through the cooperation of the first control unit and the second control unit, only the selected camera and its corresponding lighting lamp are provided with working power, and for the unselected cameras and their corresponding lighting lamps, only standby power is provided make it soft-closed;

9) Under the premise of not hindering the monitor on the monitoring terminal from observing the on-site monitoring image, the SCR zero-crossing trigger circuit is adopted to prevent equipment failure caused by the traditional way of starting and/or the failure of other equipment through the grid interference, so as to truly achieve To "make the best use of electricity and distribute it on demand" to achieve the ultimate goal of saving energy consumption and prolonging the service life of cameras and lighting equipment.

Further, at the power input end of each camera and/or lighting lamp, a Hall current sensor and a field sampling circuit are respectively arranged, and the Hall current sensor detects the corresponding camera and/or lighting lamp input The value or size of the power supply, and the detected value or size of the camera and/or lighting input power supply, is fed back to the second control unit after being digitalized by the on-site sampling circuit, and used to form a negative feedback current control closed loop .

The first control unit includes at least a first main control CPU circuit, a key scanning circuit, an automatic control signal input circuit, a function key, and a video switcher, wherein the function keys communicate with the first main control via the key scanning circuit. The I/O terminals of the CPU circuit are connected correspondingly, and the video switcher is connected correspondingly with the I/O terminals of the first main control CPU circuit through the automatic control signal input circuit.

The second control unit includes at least a second main control CPU circuit, a D/A conversion circuit, an AC power supply and a thyristor zero-crossing trigger circuit, wherein the I/O terminal of the second main control CPU circuit is connected via a D The /A conversion circuit is connected to the control end of the thyristor zero-crossing trigger circuit, and the thyristor zero-crossing trigger circuit is connected in series between the AC power supply and the power input end of each camera/lighting lamp.

Between the first control unit and the second control unit, through the first 485 communication interface circuit, the first photoelectric isolation circuit, the second photoelectric isolation circuit, the third 485 communication interface circuit and between the first photoelectric isolation circuit and The three-core communication cable between the second photoelectric isolation circuits realizes two-way communication transmission, thereby achieving the purpose of extending the communication distance and reducing electromagnetic interference in the long-distance communication process.

Further, a normally open contact of a magnetic latching relay is connected between the input and output terminals of the thyristor zero-crossing trigger circuit; the normally open contact of the magnetic latching relay is in the " Normally closed" on-state, when the first control unit or the second control unit fails, the normally-open contact of the magnetic latching relay is "closed", forcing the connection of each camera and/or lighting Input power to make it in a non-energy-saving state, so as to ensure the normal operation of the original video system, and avoid affecting the normal operation of the original video surveillance system when a certain part of the circuit in the first control unit or the second control unit fails. Work.

The first control unit is also connected to the PC through the second 485 communication interface circuit, and with the help of the connected PC, the entire video system can store data, adjust the load output of each channel, fault alarm, event recording and work. Management functions for state adjustments.

Its automatic control signal input circuit realizes the automatic selection of video signal by reading the level level of each camera's running status indicator, and plays the function of automatic video switching.

The present invention also provides an energy-saving control device for a video surveillance system, characterized in that:

The energy-saving control device includes a first control unit set in the main operating room and a second control unit set in the field electrical cabinet or the special video system electrical control box, wherein the first control unit is used for production Personnel provide switching options for video image signals between each camera and the display, and the second control unit is triggered by the zero-crossing of the thyristors respectively arranged between the AC power supply and the power input terminals of each camera and the lighting lamp. Circuits to control on/off and standby operation of camera power and light power;

The first control unit collects the selected camera number according to the switching operation of the production personnel, and transmits the selected camera number to the second control unit;

For the selected camera and its corresponding lighting, the second control unit outputs a thyristor trigger signal, and by controlling the conduction angle of the corresponding thyristor zero-crossing trigger circuit, the selected camera and its corresponding The lighting lamp provides digitally quantized AC power, so that the selected camera and its corresponding lighting lamp can work normally;

For the unselected cameras and their corresponding lighting lamps, the second control unit outputs a thyristor trigger signal, and by controlling the conduction angle of the corresponding thyristor zero-crossing trigger circuit, the selected camera and its corresponding lights The corresponding lighting lamp provides digitalized micro-current AC power, and provides standby AC power for the unselected cameras and their corresponding lighting lamps through the protective capacitor connected in parallel at both ends of the thyristor, so that the selected camera and The corresponding lighting lamp is in standby state;

Through the cooperation of the first control unit and the second control unit, the energy-saving control device only provides working power for the selected cameras and their corresponding lighting lamps, and for unselected cameras and their corresponding lighting lamps , only provide standby power to make it in soft off state;

The energy-saving control device adopts the start-up method of the silicon controlled rectifier zero-crossing trigger circuit without hindering the monitor at the monitoring end from observing the on-site monitoring image, so as to prevent the failure of the equipment caused by the traditional way of starting and/or the failure of other equipment through the power grid , so as to truly achieve the ultimate goal of saving energy consumption and prolonging the service life of cameras and lighting equipment.

Further, at the power input end of each camera and/or lighting lamp, a Hall current sensor and a field sampling circuit are respectively arranged, and the Hall current sensor detects the corresponding camera and/or lighting lamp input The value or size of the power supply, and the detected value or size of the camera and/or lighting input power supply, is fed back to the second control unit after being digitalized by the on-site sampling circuit, and used to form a negative feedback current control closed loop .

Further, the first control unit is also connected to a PC, and with the help of the connected PC, the entire video system can be managed by storing data, adjusting the load output of each channel, fault alarming, event recording and working status adjustment Function.

Further, a normally open contact of a magnetic latching relay is connected between the input and output terminals of the thyristor zero-crossing trigger circuit; the normally open contact of the magnetic latching relay is in the " Normally closed" on-state, when the first control unit or the second control unit fails, the normally-open contact of the magnetic latching relay is "closed", forcing the connection of each camera and/or lighting Input power to make it in a non-energy-saving state, so as to ensure the normal operation of the original video system, and avoid affecting the normal operation of the original video surveillance system when a certain part of the circuit in the first control unit or the second control unit fails. Work.

Compared with prior art, the advantages of the present invention are:

1. Using a magnetic latching relay, the magnetic latching relay does not consume system current after it operates, and is a green product of an energy-saving switch;

2. There is a protective standby circuit at the two ends of the thyristor zero-crossing trigger circuit, which can absorb the high-frequency pulses at the two ends of the thyristor, and can also provide a small standby current for camera standby and lighting filament preheating, which can effectively Protection of thyristor components and load circuits.

3. The software is used to control the zero-crossing trigger thyristor circuit, which effectively prevents the interference of the thyristor circuit to the external circuit. best parameters;

4. Data processing is carried out through the software in the main control CPU, and each unit circuit can be saved in the PC or MCU in the state of automatic detection for standby, and the best parameters for debugging are opened, providing a good human-computer interaction interface for quantitative applications .

Description of drawings

Fig. 1 is a schematic diagram of a module structure of an existing industrial television system;

Fig. 2 is a schematic structural diagram of the industrial television system module after improvement of the present invention;

Fig. 3 is a working principle block diagram of the energy-saving control device of the technical solution of the present invention;

Fig. 4 is an electrical schematic diagram of the first control unit part of the energy-saving control device of the present invention;

Fig. 5 is an electrical schematic diagram of the second control unit of the energy-saving control device of the present invention.

In the figure, 1 is the first control unit, 2 is the second control unit, 3 is the first main control CPU circuit, 4 is the first 485 communication interface circuit, 5 is the button scanning circuit, 6 is the automatic control signal input circuit, 7 is the Function keys, 8 is a video switcher, 9 is a PC, 10 is a second 485 communication interface circuit, 11 is a first photoelectric isolation circuit, 12 is a 3-core communication cable, 13 is a second main control CPU circuit, 14 is a second Three 485 communication interface circuits, 15 is a D/A conversion circuit, 16 is an A/D conversion circuit, 17 is an AC power supply, 18 is a protection standby circuit, 19 is a zero-crossing detection synchronization circuit, 20 is a signal threshold control circuit, 21 is Trigger circuit, 22 is a thyristor circuit, magnetic latching switch, 23 is a signal filter matching circuit, 24 is a sampling signal AC/DC circuit, 25 is an isolation circuit, 26 is a current sampling circuit, 27 is a digital quantization AC output terminal, 28 It is an AC input power supply, 29 is a second photoelectric isolation circuit, and 30 is a live camera or a lighting lamp.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

In Fig. 2, the technical solution of the present invention provides an energy-saving control device for a video monitoring system. When the production personnel selects the desired monitoring video signal, the energy-saving control device of the video monitoring system receives the signal and will produce The power of the camera and lighting corresponding to the video signal selected by the personnel is turned on, and at the same time, the power of other cameras and lighting corresponding to the video that is not in the monitoring screen is soft-off and started through the CPU control special circuit, effectively ensuring that the equipment is from the standby state Switching to quick start-up does not hinder the observation of images at the monitoring end. Due to the adoption of the zero-crossing trigger circuit start-up method, it can prevent equipment failures caused by traditional start-ups from interfering with other equipment through the power grid. It truly achieves "make the best use of electricity and distribute it on demand" to achieve the ultimate goal of saving energy consumption and prolonging the service life of equipment.

In Fig. 3, the energy-saving control device described in the technical solution of the present invention includes the first control unit 1 set in the main operating room and the second control unit 2 set in the field electrical cabinet or the special video system electrical control box, wherein the The above-mentioned first control unit is used to provide the production personnel with the switching selection of video image signals between each camera and the display, and the above-mentioned second control unit is respectively arranged on the AC power supply and the power input of each camera and lighting lamp. The thyristor zero-crossing trigger circuit between the terminals controls the on/off and standby operation of the camera power supply and lighting lamp power supply.

The first control unit collects the selected camera number according to the switching operation of the production personnel, and transmits the selected camera number to the second control unit.

For the selected camera and its corresponding lighting, the second control unit outputs a thyristor trigger signal, and by controlling the conduction angle of the corresponding thyristor zero-crossing trigger circuit, the selected camera and its corresponding The lighting lamp provides digitally quantized AC power, so that the selected camera and its corresponding lighting lamp can work normally;

For the unselected cameras and their corresponding lighting lamps, the second control unit outputs the thyristor trigger signal and controls the conduction angle of the corresponding thyristor zero-crossing trigger circuit to provide the selected camera And its corresponding lighting lamps provide digital micro-current AC power, at the same time, provide standby AC power for unselected cameras and their corresponding lighting lamps through the protection capacitors connected in parallel at both ends of the thyristor, so that the selected The camera and its corresponding light are in the standby state;

Through the cooperation of the first control unit and the second control unit, the energy-saving control device only provides working power for the selected cameras and their corresponding lighting lamps, and for unselected cameras and their corresponding lighting lamps , only provide standby power to make it in soft off state;

The energy-saving control device adopts the start-up method of the silicon controlled rectifier zero-crossing trigger circuit without hindering the monitor at the monitoring end from observing the on-site monitoring image, so as to prevent the failure of the equipment caused by the traditional way of starting and/or the failure of other equipment through the power grid , so as to truly achieve the ultimate goal of saving energy consumption and prolonging the service life of cameras and lighting equipment.

The working process of the energy-saving device as shown in the figure is as follows:

The entire energy-saving system is composed of the first control unit 1 and the second control unit 2. The first control unit is installed in the operating room, and the second control unit is installed in the on-site electrical cabinet or the special video system electrical control box. When the production operation When the personnel need to switch the video signal, press the function button 7 to send a control signal, and the control signal enters the first main control CPU circuit 3 through the button scanning circuit 5 for processing (all control, communication and sampling of the sending end are performed by the first main control CPU circuit 3). A main control CPU circuit to complete the processing), and then realize two-way communication transmission through the first 485 communication interface circuit 4 and the first photoelectric isolation circuit 11 (the purpose of this integrated circuit design is mainly to extend the communication distance and reduce the communication in the middle of the long-distance communication) Interference), through the 3-core communication cable 12, the second photoelectric isolation circuit 29, the third 485 communication interface circuit 14, the control signal is passed to the second main control CPU circuit 13, and the signal is sampled by the CPU, Then output the processed control signal to the power circuit to control the on-off and standby operations of the camera power supply and lighting lamp power supply.

A PC 9 can be connected to the system to manage the system (store data, adjust the load output of each channel, fault alarm, event record, working status, etc.), the system can generate automatic control signals, and can also be controlled by an external video switcher 8 The generated level signal is automatically controlled.

Field device current sampling; the load current is detected by the Hall element in the current sampling circuit 26, and the strong current is effectively isolated and amplitude-shaped by the isolation circuit 25, and converted into DC, 0-5V in the sampling signal AC/DC circuit 24 The DC level is input to the A/D conversion circuit 16 through the signal filter matching circuit 23, and is transmitted to the second main control CPU circuit 13 in the form of data. After processing, the trigger circuits of each thyristor circuit 22 are controlled to make the output trigger The control and sampling signals form a closed-loop state.

In the figure, the contacts of the magnetic latching relay 22 are set in the "normally closed" state when the power is off, and the system work will not be affected when the equipment fails.

In the thyristor zero-crossing trigger circuit, the AC power supply 17 takes out the synchronous signal through the isolation transformer, provides it to the zero-crossing detection synchronous circuit 19 to generate the synchronous signal, and sends it to the second main control CPU circuit 13 for processing through the signal threshold control circuit 20, After software adjustment, the analog control signal is output from the D/A conversion circuit 15, and through the trigger circuit 21, through the thyristor and the magnetic latching switch circuit 22, the ideal camera standby and lighting of the digital quantization can be obtained at the digital quantization AC output terminal 27 The lamp filament standby preheating and normal working current can effectively prevent the lamp filament from being cold and burst, the pulse voltage of the starting circuit will damage the camera, and other equipment failures caused by circuit startup.

As can be seen in conjunction with FIGS. 2 and 3, the technical solution of the present invention is to provide an energy-saving control method for a video system, wherein the video monitoring system includes a plurality of cameras for shooting images of each monitoring site, and the The image signal output ends of each camera are respectively transmitted to the corresponding video signal input ends of a video switcher through the matching video distributor, and the video signal output ends of the video switcher are connected with a The video signal input ends of the display in the operating room are connected correspondingly; through the switching of the video signals of each camera by the video switcher, the display respectively accepts the video image signals of each camera; at each camera, Lighting lamps that provide corresponding monitoring scene lighting for the cameras are respectively provided; it is characterized in that the energy-saving control method includes:

1) A first control unit is set in the main operating room, which is used to provide production personnel with a choice of switching video image signals between each camera and the display;

2) Set a second control unit in the on-site electrical cabinet or the special video system electrical control box that provides power for each camera and lighting lamp, to control the on/off and standby state operation of the power supply of the camera and the lighting lamp;

3) Between the AC power supply in the on-site electrical cabinet or the special video system electrical control box and the power input terminals of each camera and lighting lamp, a thyristor zero-crossing trigger circuit is correspondingly set up to control each "On", "Standby" or "Off" of the working power of the camera and lighting lamp;

4) In the first control unit, collect the selected camera number according to the switching operation of the production personnel;

5) The first control unit transmits the selected camera number to the second control unit;

6) For the selected camera and its corresponding lighting, the second control unit outputs a thyristor trigger signal, and by controlling the conduction angle of the corresponding thyristor zero-crossing trigger circuit, the selected camera and Its corresponding lighting lamp provides digitally quantized AC power, so that the selected camera and its corresponding lighting lamp can work normally;

7) For unselected cameras and their corresponding lighting lamps, the second control unit outputs a thyristor trigger signal, and by controlling the conduction angle of the corresponding thyristor zero-crossing trigger circuit, the selected camera It and its corresponding lighting lamps provide digitally quantized micro-current AC power, and provide standby AC power for the unselected cameras and their corresponding lighting lamps through the protective capacitors connected in parallel at both ends of the thyristor, so that the selected The camera and its corresponding light are in standby state;

8) Through the cooperation of the first control unit and the second control unit, only the selected camera and its corresponding lighting lamp are provided with working power, and for the unselected cameras and their corresponding lighting lamps, only standby power is provided , so that it is in a soft-off state;

9) Under the premise of not hindering the monitor on the monitoring terminal from observing the on-site monitoring image, the SCR zero-crossing trigger circuit is adopted to prevent equipment failure caused by the traditional way of starting and/or the failure of other equipment through the grid interference, so as to truly achieve To "make the best use of electricity and distribute it on demand" to achieve the ultimate goal of saving energy consumption and prolonging the service life of cameras and lighting equipment.

Further, at the power input end of each camera and/or lighting lamp, a Hall current sensor and a field sampling circuit are respectively arranged, and the Hall current sensor detects the corresponding camera and/or lighting lamp input The value or size of the power supply, and the detected value or size of the camera and/or lighting input power supply, is fed back to the second control unit after being digitalized by the on-site sampling circuit, and used to form a negative feedback current control closed loop .

The first control unit includes at least a first main control CPU circuit, a key scanning circuit, an automatic control signal input circuit, a function key, and a video switcher, wherein the function keys communicate with the first main control via the key scanning circuit. The I/O terminals of the CPU circuit are connected correspondingly, and the video switcher is connected correspondingly with the I/O terminals of the first main control CPU circuit through the automatic control signal input circuit.

The second control unit includes at least a second main control CPU circuit, a D/A conversion circuit, an AC power supply and a thyristor zero-crossing trigger circuit, wherein the I/O terminal of the second main control CPU circuit is connected via a D The /A conversion circuit is connected to the control end of the thyristor zero-crossing trigger circuit, and the thyristor zero-crossing trigger circuit is connected in series between the AC power supply and the power input end of each camera/lighting lamp.

Between the first control unit and the second control unit, through the first 485 communication interface circuit, the first photoelectric isolation circuit, the second photoelectric isolation circuit, the third 485 communication interface circuit and between the first photoelectric isolation circuit and The three-core communication cable between the second photoelectric isolation circuits realizes two-way communication transmission, thereby achieving the purpose of extending the communication distance and reducing electromagnetic interference in the long-distance communication process.

Further, a normally open contact of a magnetic latching relay is connected between the input and output terminals of the thyristor zero-crossing trigger circuit; the normally open contact of the magnetic latching relay is in the " Normally closed" on-state, when the first control unit or the second control unit fails, the normally-open contact of the magnetic latching relay is "closed", forcing the connection of each camera and/or lighting Input power to make it in a non-energy-saving state, so as to ensure the normal operation of the original video system, and avoid affecting the normal operation of the original video surveillance system when a certain part of the circuit in the first control unit or the second control unit fails. Work.

The first control unit is also connected to the PC through the second 485 communication interface circuit, and with the help of the connected PC, the entire video system can store data, adjust the load output of each channel, fault alarm, event recording and work. Management functions for state adjustments.

Its automatic control signal input circuit realizes the automatic selection of video signal by reading the level level of each camera's running status indicator, and plays the function of automatic video switching.

4 and 5 show specific circuit diagrams for adding the intelligent energy-saving control device described in the technical solution of the present invention to the existing video surveillance system.

When the production operator switches the video signal on the video switcher, a control signal is sent, and the control signal enters IC1 (W77E516 single-chip microcomputer) for processing, (all the control, communication, and sampling of the sending end are processed by the single-chip microcomputer) and then IC1 (W77E516 single-chip microcomputer) sends out the processed control signal through D1 (SN75176 communication integrated circuit), (the purpose of this integrated circuit design is mainly to extend the communication distance and reduce the interference in long-distance communication) through 3-core communication Cable, the control signal is transmitted to MCU1 (ATMEGA128 single-chip microcomputer) through D2 (SN75176 communication integrated circuit), and the single-chip microcomputer samples and processes the signal, and then outputs the processed control signal to the power circuit to control the camera power supply and lighting On-off and standby operation of lamp power.

In the figure, the magnetic latching relay contacts are set in the normally closed state when the power is off, and the system will not be affected when the equipment fails. In the figure, Y1 and Y2 are crystals, which are used to provide the clock signal of the single-chip microcomputer. R1, C1, R4, and C7 provide reset (clearing) for the initialization of the single-chip microcomputer. The communication baud rate is 300bit~9600bit. The drive circuit for maintaining the pulse signal of the relay, U7 and U8 are the drive circuits for MCU1 to control the standby state of the camera and the preheating state of the filament of the lighting lamp.

SK7～SK14 are bidirectional thyristors that integrate photoelectric isolation, zero-crossing detection, and zero-crossing trigger. After MCU1 software adjustment, zero triggering and other technical measures are applied, and the ideal camera standby and lighting filament standby preheating can be obtained through the above circuits. current state.

The zero-crossing detection circuit composed of T1, U4, U1, R3, and R2 performs power frequency positive and negative zero-crossing detection, and MCU1 simultaneously sends out the gate control level of the control gate control circuit to control the number of SCR zero-crossing trigger pulses. To achieve the ideal standby current for the load, it can effectively prevent the filament of the bulb from being cold and burst, the pulse voltage of the startup circuit from damaging the camera, or other equipment failures caused by the startup of the circuit.

Since the models of each integrated circuit chip have been marked in the figure, they will not be listed separately here.

Since each component in the figure is a standard icon, those skilled in the art can fully understand the meaning of each component code, and will not describe them one by one here.

Under the premise of ensuring the normal use of the video surveillance system, the present invention adopts the start-up mode of the thyristor zero-crossing trigger circuit and the closed-loop control technology of the current detection load characteristic, and performs different power switch signals in the video surveillance system according to changes in monitoring requirements. switch between different working states to achieve energy-saving control, which not only reduces the power consumption required by cameras and lighting lamps, but also avoids energy waste; at the same time, it also greatly prolongs the service life of equipment such as cameras and lighting lamps, and truly achieves "exhaustion of power". Use it, distribute it according to your needs."

The invention can be widely used in the field of design and manufacture of video surveillance devices.

Claims (10)

1. A kind of energy-saving control method that is used for video monitoring system, its video monitoring system comprises many cameras that are used to take each monitoring scene image, and the image signal output end of each camera, through the supporting video distributor with it , respectively transmitted to the corresponding video signal input end of a video switcher, the video signal output end of the video switcher is correspondingly connected with the video signal input end of a monitor arranged in the main operating room; through the video The switcher switches the video signals of each camera, and the monitors respectively accept the video image signals of each camera; at each camera, there are lighting lamps that provide corresponding monitoring scene lighting for the cameras; It is characterized in that the energy-saving control method includes: 1) A first control unit is set in the main operating room, which is used to provide production personnel with a choice of switching video image signals between each camera and the display; 2) Set a second control unit in the on-site electrical cabinet or the special video system electrical control box that provides power for each camera and lighting lamp, to control the on/off and standby state operation of the power supply of the camera and the lighting lamp; 3) Between the AC power supply in the on-site electrical cabinet or the special video system electrical control box and the power input terminals of each camera and lighting lamp, a thyristor zero-crossing trigger circuit is correspondingly set up to control each On/standby/off of the working power of the camera and lighting lamp; 4) In the first control unit, collect the selected camera number according to the switching operation of the production personnel; 5) The first control unit transmits the selected camera number to the second control unit; 6) For the selected camera and its corresponding lighting, the second control unit outputs a thyristor trigger signal, and by controlling the conduction angle of the corresponding thyristor zero-crossing trigger circuit, the selected camera and Its corresponding lighting lamp provides digitally quantized AC power, so that the selected camera and its corresponding lighting lamp can work normally; 7) For unselected cameras and their corresponding lighting lamps, the second control unit outputs a thyristor trigger signal, and by controlling the conduction angle of the corresponding thyristor zero-crossing trigger circuit, the selected camera It and its corresponding lighting lamps provide digitally quantized micro-current AC power, and provide standby AC power for the unselected cameras and their corresponding lighting lamps through the protective capacitors connected in parallel at both ends of the thyristor, so that the selected The camera and its corresponding light are in standby state; 8) Through the cooperation of the first control unit and the second control unit, only the selected camera and its corresponding lighting lamp are provided with working power, and for the unselected cameras and their corresponding lighting lamps, only standby power is provided Leave it in soft off state. 2. According to the energy-saving control method for video monitoring system according to claim 1, it is characterized in that a Hall current sensor and field sampling Circuit, the Hall current sensor detects the value or size of the input power of the corresponding camera and/or lighting lamp, and digitizes the detected value or size of the input power of the camera and/or lighting lamp through the on-site sampling circuit Afterwards, it is fed back to the second control unit to form a negative feedback current control closed loop. 3. The energy-saving control method for a video surveillance system according to claim 1, wherein said first control unit at least includes a first main control CPU circuit, a button scanning circuit, an automatic control signal input circuit, and a function button , video switcher, wherein, described function button is correspondingly connected with the I/O terminal of first main control CPU circuit through key scanning circuit, described video switcher is through automatic control signal input circuit and first main control CPU circuit The I/O terminal corresponding to the connection; The second control unit includes at least a second main control CPU circuit, a D/A conversion circuit, an AC power supply and a thyristor zero-crossing trigger circuit, wherein the I/O terminal of the second main control CPU circuit is connected via D/A The A conversion circuit is connected to the control end of the thyristor zero-crossing trigger circuit, and the thyristor zero-crossing trigger circuit is connected in series between the AC power supply and the power input end of each camera/lighting lamp; Between the first control unit and the second control unit, through the first 485 communication interface circuit, the first photoelectric isolation circuit, the second photoelectric isolation circuit, the third 485 communication interface circuit and between the first photoelectric isolation circuit and the second photoelectric isolation circuit The three-core communication cable between the two photoelectric isolation circuits realizes two-way communication transmission, and thereby achieves the purpose of extending the communication distance and reducing electromagnetic interference in the long-distance communication process. 4. The energy-saving control method for a video surveillance system according to claim 1, characterized in that between the input and output terminals of the thyristor zero-crossing trigger circuit, a normally open magnetic latching relay is connected in parallel. Contact; the normally open contact of the magnetic latching relay is in the "normally closed" on state when the control system is powered off. When the first control unit or the second control unit fails, the magnetic latching relay The normally open contact is "closed", and the input power of each camera and/or lighting lamp is forced to be connected, so that it is in a non-energy-saving state, so as to ensure the normal operation of the original video system and avoid the failure caused by the first control unit or the second control unit. When a part of the circuit in the control unit fails, it will affect the normal operation of the original video surveillance system. 5. The energy-saving control method for video monitoring system according to claim 1, characterized in that the first control unit is also connected to the PC via the second 485 communication interface circuit, and by means of the connected PC, realizes It is a management function for storing data, adjusting the load output of each channel, fault alarm, event recording and working status adjustment for the entire video system. 6. The energy-saving control method for a video monitoring system according to claim 1, wherein the automatic control signal input circuit realizes the monitoring of the video by reading the level of the operating status indicator terminal of each camera. The automatic selection of signal plays the function of automatic video switching. 7. An energy-saving control device for a video surveillance system, characterized in that: The energy-saving control device includes a first control unit set in the main operating room and a second control unit set in the field electrical cabinet or the special video system electrical control box, wherein the first control unit is used for production Personnel provide switching options for video image signals between each camera and the display, and the second control unit is triggered by the zero-crossing of the thyristors respectively arranged between the AC power supply and the power input terminals of each camera and the lighting lamp. Circuits to control on/off and standby operation of camera power and light power; The first control unit collects the selected camera number according to the switching operation of the production personnel, and transmits the selected camera number to the second control unit; For the selected camera and its corresponding lighting, the second control unit outputs a thyristor trigger signal, and by controlling the conduction angle of the corresponding thyristor zero-crossing trigger circuit, the selected camera and its corresponding The lighting lamp provides digitally quantized AC power, so that the selected camera and its corresponding lighting lamp can work normally; For the unselected cameras and their corresponding lighting lamps, the second control unit outputs a thyristor trigger signal, and by controlling the conduction angle of the corresponding thyristor zero-crossing trigger circuit, the selected camera and its corresponding lights The corresponding lighting lamp provides digitalized micro-current AC power, and provides standby AC power for the unselected cameras and their corresponding lighting lamps through the protective capacitor connected in parallel at both ends of the thyristor, so that the selected camera and The corresponding lighting lamp is in standby state; Through the cooperation of the first control unit and the second control unit, the energy-saving control device only provides working power for the selected cameras and their corresponding lighting lamps, and for unselected cameras and their corresponding lighting lamps , only provide standby power to make it in soft off state; The energy-saving control device adopts the start-up method of the silicon controlled rectifier zero-crossing trigger circuit without hindering the monitor at the monitoring end from observing the on-site monitoring image, so as to prevent the failure of the equipment caused by the traditional way of starting and/or the failure of other equipment through the power grid , so as to truly achieve the ultimate goal of saving energy consumption and prolonging the service life of cameras and lighting equipment. 8. According to the energy-saving control device for video surveillance system according to claim 7, it is characterized in that a Hall current sensor and field sampling Circuit, the Hall current sensor detects the value or size of the input power of the corresponding camera and/or lighting lamp, and digitizes the detected value or size of the input power of the camera and/or lighting lamp through the on-site sampling circuit Afterwards, it is fed back to the second control unit to form a negative feedback current control closed loop. 9. The energy-saving control device for video monitoring system according to claim 7, characterized in that the first control unit is also connected to a PC, and by means of the connected PC, the entire video system can store data , Adjust the management functions of each load output, fault alarm, event record and working state adjustment. 10. The energy-saving control device for a video monitoring system according to claim 7, characterized in that between the input and output terminals of the thyristor zero-crossing trigger circuit, a normally open magnetic latching relay is connected in parallel. Contact; the normally open contact of the magnetic latching relay is in the "normally closed" on state when the control system is powered off. When the first control unit or the second control unit fails, the magnetic latching relay The normally open contact is "closed", and the input power of each camera and/or lighting lamp is forced to be connected, so that it is in a non-energy-saving state, so as to ensure the normal operation of the original video system and avoid the failure caused by the first control unit or the second control unit. When a part of the circuit in the control unit fails, it will affect the normal operation of the original video surveillance system.