CN106487223A - Voltage control circuit - Google Patents
Voltage control circuit Download PDFInfo
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- CN106487223A CN106487223A CN201510545531.3A CN201510545531A CN106487223A CN 106487223 A CN106487223 A CN 106487223A CN 201510545531 A CN201510545531 A CN 201510545531A CN 106487223 A CN106487223 A CN 106487223A
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Abstract
The invention discloses a kind of voltage control circuit.Wherein, this circuit includes：The control end of video camera, for exporting the power of video camera；Testing circuit, is electrically connected with the control end of video camera, for when detect video camera power be more than power supply output when, generate control signal；Infrared lamp control chip, is electrically connected with testing circuit, for according to the control signal that receives to infrared lamp output services voltage.The present invention solve thermal camera due in single-chip microcomputer software detection speed slow so that the allotment overlong time between setting power when infrared lamp is opened and video camera power demand leads to thermal camera to need the technical problem repeatedly restarted.
Description
Technical field
The present invention relates to electrical application technology field, in particular to a kind of voltage control circuit.
Background technology
With the popularization of camcorder technology, be that security, monitoring field provide considerable technical guarantee, particularly from
So under the not enough environment of daylighting, thermal camera compensate for the monitoring needs under this illumination condition, i.e. by light
Source provides infrared ray, using charge coupled cell (Charge coupled Device, abbreviation CCD) and complementary metal
Oxide semiconductor (Complementary Metal Oxide Semiconductor, abbreviation CMOS) can pass through infrared
The spectral characteristic of light, realizes " night vision imaging " in the not enough environment of natural lighting.
But during thermal camera is powered due to actual installation thermal camera apart from power supply farther out, if
Connection thermal camera is too big with the power line impedance of power supply, may result in and is opening infrared lamp to thermal camera
The shooting generator terminal supply voltage also resulting in inside is not enough, leads to the phenomenon that video camera is restarted repeatedly.
The method of existing detection camera power supply input terminal voltage is usually：By the software detection video camera in single-chip microcomputer
Power input terminal voltage, further control infrared lamp open brightness, to avoid due to remote power-feeding lead to red
The problem that when outer lamp is opened, video camera is restarted, during the realization of software, due to the finite rate of software detection, leads
Cause oversize to the response time control infrared lamp power adjustments from voltage pulsation is detected, and for avoiding video camera
Restart, the setting power opened in infrared lamp must ensure the night vision imaging effect at sufficiently large, thus to lead to night again
Will be affected.
For above-mentioned thermal camera due in single-chip microcomputer software detection speed slow so that setting work(when infrared lamp is opened
Allotment overlong time between rate and video camera power demand leads to thermal camera to need the problem repeatedly restarted, at present
Effective solution is not yet proposed.
Content of the invention
Embodiments provide a kind of voltage control circuit, at least to solve thermal camera due to soft in single-chip microcomputer
Part detection speed slow so that allotment overlong time between setting power when infrared lamp is opened and video camera power demand
Thermal camera is led to need the technical problem repeatedly restarted.
A kind of one side according to embodiments of the present invention, there is provided voltage control circuit, including：The control of video camera
End, for exporting the power of video camera；Testing circuit, is electrically connected with the control end of video camera, takes the photograph for working as to detect
When the power of camera is more than the output of power supply, generate control signal；Infrared lamp control chip, with testing circuit electricity
Connect, for according to the control signal that receives to infrared lamp output services voltage.
Further, testing circuit includes：Transistor group and resistance set, wherein, transistor group, respectively with power supply
Input and resistance set electrical connection, for generating control signal.
Further, transistor group includes：The first transistor, passes through the first resistor and second in resistance set respectively
Resistance is electrically connected with the input of power supply, for being converted to the input voltage of the input of power supply by the first transistor
The first control signal over the ground；Transistor seconds, by the 3rd resistor in resistance set and the 4th resistance, with first
Transistor electrically connects, for the first control signal is carried out Reverse Turning Control, the running voltage needed for adjusted infrared lamp
The first drive signal；Third transistor, is electrically connected with transistor seconds by the 5th resistance in resistance set, and
Electrically connected with infrared driving input port and camera control end by the 6th resistance in resistance set, for first
Drive signal carries out operating with processing with the second control signal of camera control end output, obtains control signal, wherein,
Second control signal, for indicating whether infrared lamp control chip opens infrared lamp.
Further, transistor group includes：The first transistor, transistor seconds and third transistor, wherein, first
Transistor respectively with power input and resistance set in first resistor and second resistance composition input set up be electrically connected
Connect, for the input voltage of power input is converted to the first control signal over the ground；Transistor seconds passes through resistance
3rd resistor in set and the 4th resistance are set up with the first transistor and are electrically connected, for carrying out instead the first control signal
To control, obtain driving the first drive signal of infrared lamp control chip；Third transistor passes through the in resistance set
Five resistance and the 6th resistance are set up with transistor seconds, infrared driving input port and camera control end respectively and are electrically connected
Connect, for executing and operation the second control signal of the first drive signal and the output of camera control end, controlled
Signal, and by infrared driving input port output control signal.
Further, in the case that camera control end is monolithic processor controlled Data Input Supervisor DIS video camera,
Circuit also includes：LED Access Control end, by the 6th resistance in resistance set respectively with third transistor and infrared
Drive input port electrical connection, for exporting the second control signal to third transistor.
Further, in the case of the Charged Couple ccd video camera that camera control end controls for optical transistor,
Transistor group also includes：4th transistor, is electrically connected with optical transistor by the 7th resistance in resistance set, uses
Carry out Reverse Turning Control in the photoreceptor signal exporting optical transistor, obtain the second driving driving infrared lamp control chip
Signal；5th transistor, is electrically connected with the 4th transistor by the 8th resistance in resistance set, and by the 6th electricity
Resistance is electrically connected with third transistor and infrared driving input port respectively, for sending according to the second drive to third transistor
Second control signal of dynamic signal generation.
Further, optical transistor is electrically connected with circuit power and the 4th transistor respectively, currently photosensitive for obtaining
Degree, and according to light sensitivitys output photoreceptor signal to the 4th transistor.
Further, the voltage in circuit power produces voltage of voltage regulation for stabilivolt.
Further, control signal includes：First state level signal and the second state level signal, wherein, first
The level state of state level signal and the second state level signal is contrary, and level state includes：High level and low level.
Further, the first transistor in transistor group, transistor seconds, third transistor, the 4th transistor and
5th transistor is audion.
In embodiments of the present invention, by obtaining the current power of video camera, and judge whether the power of video camera is more than
The power of current power output；When power video camera is detected is more than the output of power supply, generate control signal,
According to the control signal receiving to infrared lamp output services voltage.Reach maintenance thermal camera circuit internal stability
Purpose, it is achieved thereby that avoiding the technique effect that thermal camera is restarted repeatedly, so solve thermal camera by
In software detection speed in single-chip microcomputer slow so that between setting power when infrared lamp is opened and video camera power demand
Allotment overlong time leads to thermal camera to need the technical problem repeatedly restarted.
Brief description
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this
Bright schematic description and description is used for explaining the present invention, does not constitute inappropriate limitation of the present invention.In accompanying drawing
In：
Fig. 1 is the drive circuit that infrared lamp of vidicon is commonly used；
Fig. 2 is the structural representation of voltage control circuit according to embodiments of the present invention；
Fig. 3 is a kind of structural representation of voltage control circuit according to embodiments of the present invention；
Fig. 4 assumes that power line impedance 10 Ω phase generator terminal power with impedance variation curve；And,
Fig. 5 is the corresponding relation curve chart of load line and camera chain.
Specific embodiment
In order that those skilled in the art more fully understand the present invention program, below in conjunction with the embodiment of the present invention
Accompanying drawing, is clearly and completely described the embodiment it is clear that described to the technical scheme in the embodiment of the present invention
It is only the embodiment of a present invention part, rather than whole embodiments.Based on the embodiment in the present invention, ability
The every other embodiment that domain those of ordinary skill is obtained under the premise of not making creative work, all should belong to
The scope of protection of the invention.
It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, "
Two " it is etc. for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that this
Sample use data can exchange in the appropriate case so that embodiments of the invention described herein can with except
Here the order beyond those illustrating or describing is implemented.Additionally, term " comprising " and " having " and they
Any deformation, it is intended that covering non-exclusive comprising, for example, contains process, the side of series of steps or unit
Method, system, product or equipment are not necessarily limited to those steps clearly listed or unit, but may include unclear
List or for these processes, method, product or the intrinsic other steps of equipment or unit.
The present embodiments relate to technical term：
Thermal camera：Thermal camera is exactly by CCTV camera, protective cover, infrared lamp, power supply heat-sink unit etc.
Comprehensive all-in-one-piece monitoring device.At present in supervision control engineering, the most frequently used infrared waterproof camera is active infrared, by sending out
Optical diode (Light Emitting Diode, abbreviation LED) sends infrared ray, using charge coupled cell
(Charge-coupled Device, abbreviation CCD) or complementary metal oxide semiconductors (CMOS) (Complementary Metal
Oxide Semiconductor, abbreviation CMOS) can experience infrared light spectral characteristic (can experience visible ray,
Infrared light can also be experienced), cooperation infrared lamp carrys out night vision imaging as " light source ".With launch wavelength 850nm on market
Based on the infrared LED of 940nm.
During implementing voltage control circuit provided in an embodiment of the present invention, voltage control provided in an embodiment of the present invention
The drive circuit that circuit processed is commonly used with associated camera infrared lamp is set up and is electrically connected, so that realizing in stabilizing circuit power
While ensure infrared lamp normal operation, wherein, this infrared lamp of vidicon commonly use drive circuit be specifically as follows figure
1, Fig. 1 is the drive circuit that infrared lamp of vidicon is commonly used.SY8708 chip in Fig. 1 is that a constant current output drives
Chip, is all turned on rear output current size and is determined by resistance R6, R7.The the opening and shutting off by single-chip microcomputer of infrared lamp
I/O port controls the EN end of SY8708.This EN pin has simulation dimming function simultaneously, output current also with simulation
The voltage of light modulation input controlling switch is relevant.
According to embodiments of the present invention, there is provided a kind of embodiment of voltage control circuit, Fig. 2 is to be implemented according to the present invention
The structural representation of the voltage control circuit of example, as shown in Fig. 2 this circuit includes：The control end 22 of video camera, inspection
Slowdown monitoring circuit 24 and infrared lamp control chip 26, wherein,
The control end 22 of video camera, for exporting the power of video camera；
Testing circuit 24, is electrically connected with the control end 22 of video camera, for being more than electricity when power video camera is detected
During the output in source, generate control signal；
Infrared lamp control chip 26, is electrically connected with testing circuit 24, for according to the control signal that receives to infrared
Lamp output services voltage.
Specifically, in the embodiment of the present invention, the video camera of offer can be：Monolithic processor controlled Data Input Supervisor
(Data Input Supervisor, abbreviation DIS) video camera, or, the Charged Couple that optical transistor controls
(Charge-coupled Device, abbreviation CCD) video camera.
Wherein, when the peak power of video camera is more than current power and cable energy Maximum Power Output, the present invention is implemented
The voltage control circuit that example provides supply voltage stable in 6V, that is, will be adjusted to the power of video camera
Current system allows maximum power point, to avoid video camera to restart.In voltage control circuit provided in an embodiment of the present invention
In, when the peak power of video camera is less than current system permission maximum power point, this circuit will not work, infrared
Lamp is normally controlled by Single-chip Controlling or photosensor signal.
In embodiments of the present invention, by obtaining the current power of video camera, and judge whether the power of video camera is more than
The power of current power output；When power video camera is detected is more than the output of power supply, generate control signal,
According to the control signal receiving to infrared lamp output services voltage.Reach maintenance thermal camera circuit internal stability
Purpose, it is achieved thereby that avoiding the technique effect that thermal camera is restarted repeatedly, so solve thermal camera by
In software detection speed in single-chip microcomputer slow so that between setting power when infrared lamp is opened and video camera power demand
Allotment overlong time leads to thermal camera to need the technical problem repeatedly restarted.
Voltage control circuit provided in an embodiment of the present invention is specifically as follows shown in Fig. 3, and Fig. 3 is to be implemented according to the present invention
A kind of structural representation of voltage control circuit of example, as shown in Figure 3 it is preferred that this circuit is specially：
Wherein, testing circuit 22 includes：Transistor group and resistance set, wherein,
Transistor group, is electrically connected with the input of power supply and resistance set, respectively for generating control signal.
Specifically, when power input V1 input voltage be more than infrared lamp stable operation voltage (that is, drive red
Voltage needed for outer lamp) when, transistor group is down to the voltage of this infrared lamp stable operation by adjusting this input voltage；When
When the input voltage of power input V1 is less than the voltage of infrared lamp stable operation, transistor group will adjust this input electricity
Pressure rises to the voltage of this infrared lamp stable operation.
Wherein, in voltage control circuit provided in an embodiment of the present invention, the voltage of the infrared lamp stable operation of offer can be
As follows：
Because the common power supply module of video camera is direct current 12V, but video camera is generally from power supply in actual installation
Farther out, middle tens meters of power line may be needed to connect.Some powerful infrared photography acc powers can reach 5W
More than, some power line impedance inferior can reach more than ten ohm.In these cases after the infrared lamp of video camera is opened
The supply voltage imaging generator terminal can be led to not enough, video camera occurs constantly restarting phenomenon.
Thus, by simplifying model during camera operation it is assumed that power supply is ideal DC voltage source, conductor impedance is solid
Fixed, video camera load is reduced to a load resistance.Video camera power consumption Pd and supply voltage Vin, line in theory
Cable impedance R, camera input terminal voltage Vx relationGenerally CCTV camera direct current power source voltage
For 12V, Fig. 4 assumes that power line impedance 10 Ω phase generator terminal power with impedance variation curve.It can be seen that when shooting
Machine load impedance obtains peak power 3.6W in 10 Ω phase generator terminals.Now the voltage of camera power supply outfan is 6V,
Half for supply voltage 12V.
Therefore, the voltage of the infrared lamp stable operation providing in the embodiment of the present invention can be 6V, to realize voltage control
Circuit is defined, and does not specifically limit.
Further, infrared driving input port 24, i.e. the Ven shown in Fig. 3, respectively with transistor group and electricity
Electrical connection is set up in resistance set, for the control signal receiving inputs the infrared lamp control chip of infrared lamp, controls red
Outer lamp runs.
Specifically, the control signal of the transistor group output that Ven is received can control or light according to current monolithic machine
What quick signal controlled needs to adjust the intensity of illumination of infrared lamp, and wherein, intensity of illumination is with illuminance as linear module.
Further, transistor group includes：The first transistor Q1, transistor seconds Q2 and third transistor Q3,
Wherein,
The first transistor Q1 respectively with power input V1 and resistance set in first resistor R2 and second resistance R8
The input of composition sets up electrical connection, for changing the input voltage of power input V1 by the first transistor Q1
For the first control signal over the ground；
Specifically, as shown in figure 3, the first transistor Q1 in voltage control circuit except with first resistor R2 and electricity
Resistance R8 sets up outside electrical connection, also sets up with circuit power V4 and electrically connects, and is grounded by resistance R15.
Wherein, V4 provides power input for voltage control circuit provided in an embodiment of the present invention.
The resistance of R2 and R8 can be 10k Ω in embodiments of the present invention, and the resistance of R15 can be 4.7k Ω, Q1
Specification can be Q2N3906, the voltage of V4 can be 5.1V direct current.
Transistor seconds Q2 passes through 3rd resistor R14 and the 4th resistance R9 and the first transistor Q1 in resistance set
Set up electrical connection, for the first control signal is carried out Reverse Turning Control, the running voltage needed for adjusted infrared lamp
First drive signal；
Specifically, as shown in figure 3,3rd resistor R14 is in parallel with resistance R6, resistance R6 respectively with resistance R7 and
4th resistance R9 series connection, the first transistor Q1 is set up with transistor seconds Q2 and electrically connects, and transistor seconds Q2
It is grounded by resistance R18.
Wherein, the electric current that R14 and R6 inputs to power input V1 shunts, and R6 and R9 is to power input
The voltage of V1 input carries out partial pressure.
The resistance of R14, R9 and R18 can be 10k Ω in embodiments of the present invention, and the resistance of R6 and R7 can be
The specification of 4.7k Ω, Q2 can be Q2N3906.
Third transistor Q3 pass through resistance set in the 5th resistance R16 and the 6th resistance R12 respectively with the second crystal
Electrical connection is set up at pipe Q2, infrared driving input port Ven and camera control end, for the first drive signal with
Second control signal of camera control end output carries out and processes operation, obtains control signal, wherein, the second control
Signal, for indicating whether infrared lamp control chip opens infrared lamp.
As shown in figure 3, third transistor Q3 passes through the 5th resistance R16 electrically connecting with transistor seconds Q2 foundation,
And, third transistor Q3 is grounded by resistance R19, by the 6th resistance R12 respectively with Ven and camera control
Electrical connection is set up at end.
Specifically, third transistor Q3 is received the second control signal and the transistor seconds Q2 at camera control end
If with operation it is assumed that the second control signal is " 1 ", the first drive signal is " 0 " for the first drive signal execution of output,
Then the control signal of Q3 output is " 0 ", and " 0 " is inputted infrared lamp control chip via Ven.
The resistance of R16 can be 10k Ω in embodiments of the present invention, and the resistance of R12 can be 15k Ω, the resistance of R19
Value can be 1k Ω, and the specification of Q3 can be SS8050.
Further, in the case that camera control end is monolithic processor controlled Data Input Supervisor DIS video camera,
Circuit also includes：LED Access Control end, wherein,
LED Access Control end pass through resistance set in the 6th resistance R12 respectively with third transistor Q3 and infrared drive
Dynamic input port Ven sets up electrical connection, for exporting the second control signal to third transistor Q3.
In voltage control circuit provided in an embodiment of the present invention, control signal could be arranged to high level signal or low level
Signal, wherein, high level signal is used for indicating night white-black pattern, and low level signal is used for indicating color mode on daytime.
Specifically, camera control end provided in an embodiment of the present invention is with monolithic processor controlled Data Input Supervisor
In the case of DIS video camera, the second control signal is exported by single-chip microcomputer, i.e. be used for controlling whether to open infrared lamp,
The first drive signal that third transistor Q3 receives is used for controlling the unlatching brightness of infrared lamp, according to the first drive signal
With the level state of the second control signal, by the execution of third transistor Q3 and operation, whether opened infrared lamp
And the control signal of the unlatching brightness after the unlatching of this infrared lamp, finally this control signal is exported by Ven mouth.
For example, the high level being " unlatching " when the second control signal whether the control infrared lamp of single-chip microcomputer output is opened
Signal, the first drive signal that third transistor Q3 receives is the high level controlling infrared lamp brightness to be " highlighted "
Signal, executed by Q3 with operation, the control signal of output is " unlatching " infrared lamp of high level simultaneously infrared
The signal of lamp modulation " highlighted ".
The camera control end of voltage control circuit provided in an embodiment of the present invention is monolithic processor controlled data input monitoring
In the case of device DIS video camera, output control signal only taking above-mentioned as a example illustrates, to realize the embodiment of the present invention
The voltage control circuit providing is defined, and does not specifically limit.
Further, in the case of the Charged Couple ccd video camera that camera control end controls for optical transistor,
Transistor group also includes：4th transistor Q5 and the 5th transistor Q4, wherein,
The 7th resistance R5 that 4th transistor Q5 passes through in resistance set is set up with optical transistor 1uAdc and electrically connects,
Photoreceptor signal for exporting optical transistor 1uAdc carries out Reverse Turning Control, obtains driving infrared lamp control chip
Second drive signal；
As shown in figure 3, the 4th transistor Q5 passes through the 7th resistance R5 electrically connecting with optical transistor 1uAdc foundation,
And, the 4th transistor Q5 is grounded by resistance R13, is set up by resistance R4, R3 and R1 and circuit power V2
Electrical connection.
The resistance of R13 and R3 can the resistance for 33k Ω, R4 can be 15k Ω, R1 in embodiments of the present invention
Resistance with R5 can be 4.7k Ω, and the specification of Q5 can be Q2N3906, and the voltage of V2 can be 5.1V direct current.
Specifically, the 4th transistor Q5 executes Reverse Turning Control to optical transistor, i.e. the sense of optical transistor feedback
Optical signal is stronger, and the second drive signal of the 4th transistor Q5 output is weaker, the 4th transistor Q5 and optical transistor
Electrical connection be used for indicating, currently light is brighter, voltage control circuit provided in an embodiment of the present invention is defeated at Ven end
The control signal going out more does not need to control infrared lamp control chip to drive infrared lamp to provide infrared illumination for video camera；
On the contrary, when the photoreceptor signal of optical transistor is weaker, the second drive signal of the 4th transistor Q5 output is stronger,
That is, under current light environment, illumination is not enough, needs the control signal of Ven end output to start infrared lamp and carries for video camera
For infrared illumination.
5th transistor Q4, is electrically connected with the 4th transistor Q5 by the 8th resistance R10 in resistance set, and leads to
Cross the 6th resistance R12 to electrically connect with third transistor Q3 and infrared driving input port Ven respectively, for the 3rd
Transistor Q3 sends the second control signal generating according to the second drive signal.
As shown in figure 3, the 5th transistor Q4 pass through the 8th resistance R10 respectively with the 4th transistor Q5, the 3rd crystal
Pipe Q3 and infrared driving input port Ven sets up electrical connection, and, the 5th transistor Q4 is grounded by resistance R17,
Set up with third transistor Q3 by the 6th resistance R12 and electrically connect.
The resistance of R17 can be the resistance that the resistance of 33k Ω, R12 can be 15k Ω, R10 in embodiments of the present invention
Value can be 4.7k Ω, and the specification of Q4 can be SMBT3904.
Specifically, Q4 is to use as emitter follower, is provided with the signal ensureing photosensitive output and controls infrared lamp to control
Electric current required for chip and current circuit.
Further, optical transistor 1uAdc is set up with circuit power V3 and the 4th transistor Q5 respectively and electrically connects,
For obtaining current light sensitivitys, and according to light sensitivitys output photoreceptor signal to the 4th transistor Q5.
As shown in figure 3, optical transistor 1uAdc is set up with circuit power V3 and the 4th transistor Q5 being respectively electrically connected
Connect, and be grounded by resistance R11.
The resistance of R11 can be 1meg in embodiments of the present invention, and V3's can be 5.1V direct current.
Further, the voltage of voltage regulation that the voltage in circuit power produces for stabilivolt.
That is, the 5.1V DC voltage of V2, V3 and V4 produces voltage of voltage regulation for stabilivolt.
Further, control signal includes：First state level signal and the second state level signal, wherein, first
The level state of state level signal and the second state level signal is contrary, and level state includes：High level and low level.
Further, the first transistor Q1 in transistor group, transistor seconds Q2, third transistor Q3, the 4th
Transistor Q5 and the 5th transistor Q4 is audion.
Preferably, voltage control circuit provided in an embodiment of the present invention provides and uses the work to camera chain for the load line
Point is analyzed, and Fig. 5 is the corresponding relation curve chart of load line and camera chain, as shown in figure 5,
Wherein, what dotted line represented is the power source loads line that 12V ideal voltage source forms together with wire, according to Dai Weinan
Theorem conductor impedance can be considered the internal resistance of source.It is 10 Ω and the electricity of 5 Ω that red and green straight line represents conductor impedance respectively
Source load line.Black curve represents video camera bearing power and is fixed as load line during 5W.Solid line is intersected with dotted line
Point is exactly the operating point of camera chain.
Based on Fig. 5 it can be seen that when shooting acc power be fixed as 5W, conductor impedance be during 5 Ω image generator terminal voltage about
For 9.5V.When conductor impedance is 10 Ω, curve dotted line corresponding with 10 Ω does not have cross point, and now system can go out
Now constantly restart phenomenon.Increase Power Control part circuit function be equivalent to supply voltage be reduced to 6V about when
Bearing power is dynamically adjusted according to supply voltage.
It is assumed that power consumption is 10W, the 1W during power of video camera when infrared lamp is fully closed when infrared lamp of vidicon is all turned on,
Now the load line of video camera can be substituted using broken line.As long as shown in figure 5, dotted line position is higher than broken line lower half
Point, just always there is intersection point with line of discounting, that is, there is stable operating point, as long as that is, camera power supply can guarantee that infrared lamp
The minimum requirements that can work together when being not turned on, restarting would not occur in video camera.It can also be seen that when dotted line position is low
When broken line top half, the coordinate of the intersection point of dotted line and blue broken line is always near 6V, that is, infrared when video camera
Image when lamp can not be all turned on generator terminal supply voltage be bound to stable in 6V.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
In the above embodiment of the present invention, the description to each embodiment all emphasizes particularly on different fields, and does not have in certain embodiment
The part describing in detail, may refer to the associated description of other embodiment.
It should be understood that disclosed technology contents in several embodiments provided herein, other can be passed through
Mode realize.Wherein, device embodiment described above is only the schematically division of for example described unit,
Can be a kind of division of logic function, actual can have other dividing mode when realizing, for example multiple units or assembly
Can in conjunction with or be desirably integrated into another system, or some features can be ignored, or does not execute.Another, institute
The coupling each other of display or discussion or direct-coupling or communication connection can be by some interfaces, unit or mould
The INDIRECT COUPLING of block or communication connection, can be electrical or other forms.
The described unit illustrating as separating component can be or may not be physically separate, show as unit
The part showing can be or may not be physical location, you can with positioned at a place, or can also be distributed to
On multiple units.Some or all of unit therein can be selected according to the actual needs to realize this embodiment scheme
Purpose.
In addition, can be integrated in a processing unit in each functional unit in each embodiment of the present invention it is also possible to
It is that unit is individually physically present it is also possible to two or more units are integrated in a unit.Above-mentioned integrated
Unit both can be to be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
If described integrated unit realized using in the form of SFU software functional unit and as independent production marketing or use when,
Can be stored in a computer read/write memory medium.Based on such understanding, technical scheme essence
On all or part of the part that in other words prior art contributed or this technical scheme can be with software product
Form embodies, and this computer software product is stored in a storage medium, including some instructions with so that one
Platform computer equipment (can be personal computer, server or network equipment etc.) executes each embodiment institute of the present invention
State all or part of step of method.And aforesaid storage medium includes：USB flash disk, read only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), portable hard drive, magnetic disc or
CD etc. is various can be with the medium of store program codes.
The above is only the preferred embodiment of the present invention it is noted that ordinary skill people for the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improve and moisten
Decorations also should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of voltage control circuit is it is characterised in that include：
The control end of video camera, for exporting the power of described video camera；
Testing circuit, is electrically connected with the control end of described video camera, for when the power described video camera is detected
More than power supply output when, generate control signal；
Infrared lamp control chip, is electrically connected with described testing circuit, for according to the described control signal receiving
To infrared lamp output services voltage.
2. voltage control circuit according to claim 1 is it is characterised in that described testing circuit includes：
Transistor group and resistance set, wherein,
Described transistor group, is electrically connected with the input of described power supply and described resistance set, respectively for generating
Described control signal.
3. voltage control circuit according to claim 2 is it is characterised in that described transistor group includes：
The first transistor, respectively by the first resistor in described resistance set and second resistance and described power supply
Input electrically connects, for being converted to the input voltage of the input of described power supply by described the first transistor
The first control signal over the ground；
Transistor seconds, by the 3rd resistor in described resistance set and the 4th resistance, with described first crystal
Pipe electrically connects, for carrying out described first control signal needed for Reverse Turning Control, adjusted described infrared lamp
First drive signal of running voltage；
Third transistor, is electrically connected with described transistor seconds by the 5th resistance in described resistance set, and
By the 6th resistance in described resistance set and described infrared driving input port and described camera control end electricity
Connect, for the second control signal of described first drive signal and the output of described camera control end is carried out with
Process operation, obtain described control signal, wherein, described second control signal, for indicating described infrared lamp
Whether control chip opens described infrared lamp.
4. voltage control circuit according to claim 3 is it is characterised in that at described camera control end
In the case of monolithic processor controlled Data Input Supervisor DIS video camera, described circuit also includes：
LED Access Control end, by described 6th resistance in described resistance set respectively with described 3rd crystal
Pipe and described infrared driving input port electrical connection, for controlling letter to described third transistor output described second
Number.
5. voltage control circuit according to claim 3 is it is characterised in that at described camera control end
In the case of the Charged Couple ccd video camera controlling for optical transistor, described transistor group also includes：
4th transistor, is electrically connected with described optical transistor by the 7th resistance in described resistance set, uses
Carry out Reverse Turning Control in the photoreceptor signal exporting described optical transistor, obtain driving described infrared lamp to control core
Second drive signal of piece；
5th transistor, is electrically connected with described 4th transistor by the 8th resistance in described resistance set, and
Electrically connected with described third transistor and described infrared driving input port respectively by described 6th resistance, be used for
Send described second control signal generating according to described second drive signal to described third transistor.
6. voltage control circuit according to claim 5 is it is characterised in that described optical transistor is distinguished
Electrically connect with circuit power and described 4th transistor, for obtaining current light sensitivitys, and according to described light sensitivitys
Export described photoreceptor signal to described 4th transistor.
7. voltage control circuit according to claim 6 is it is characterised in that electricity in described circuit power
Press the voltage of voltage regulation producing for stabilivolt.
8. the voltage control circuit according to claim 4 or 5 is it is characterised in that described control signal bag
Include：First state level signal and the second state level signal, wherein,
The level state of described first state level signal and described second state level signal is contrary, described level
State includes：High level and low level.
9. the voltage control circuit according to claim 4 or 5 is it is characterised in that in described transistor group
The first transistor, transistor seconds, third transistor, the 4th transistor and the 5th transistor be audion.
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