CN105338682B - Control circuit, the method and device of infrared lamp current - Google Patents
Control circuit, the method and device of infrared lamp current Download PDFInfo
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- CN105338682B CN105338682B CN201410318869.0A CN201410318869A CN105338682B CN 105338682 B CN105338682 B CN 105338682B CN 201410318869 A CN201410318869 A CN 201410318869A CN 105338682 B CN105338682 B CN 105338682B
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Abstract
The invention discloses a kind of control circuit, the method and devices of infrared lamp current, in foregoing circuit, choke circuit, for when opening the infrared lamp inside thermal camera, inhibiting the amplitude of variation of the electric current by the cable being powered to thermal camera；MCU circuits, one input end is connected with the power supply inside thermal camera, its another input terminal is connected with choke circuit, its output end is connected with infrared lamp drive circuit, for under inhibiting effect of the choke circuit to amplitude of variation, output control voltage, wherein control voltage is used to control the electric current by infrared lamp；Infrared lamp drive circuit is connected with MCU circuits, for the electric current for flowing through infrared lamp to be adjusted according to control voltage., can be in the case where long range to be powered according to technical solution provided by the invention, infrared photography chance opens the power of infrared lamp according to cable impedance adjust automatically, so that it is guaranteed that the normal work of thermal camera.
Description
Technical field
The present invention relates to field of video monitoring, in particular to a kind of control circuit, method and the dress of infrared lamp current
It sets.
Background technology
The visible light that the eyes of people can be seen is arranged from long to short by wavelength, is followed successively by red, orange, yellow, green, blue, blue, purple.
Wherein the wave-length coverage of feux rouges is 0.62~0.76 μm；The wave-length coverage of purple light is 0.38~0.46 μm.It is more shorter than violet wavelength
Light ultraviolet light, for the light longer than red light wavelength infrared ray, human eye can't see infrared ray.Because of digital vedio recording
Machine charge coupled cell (CCD) incude all light (including：Visible light, infrared ray and ultraviolet light etc.), it thereby results in and is clapped
To only see image caused by visible light very different from naked eyes for photogra.In order to solve this problem, DV is in camera lens
An infrared filter is installed additional between CCD, its role is to stop that infrared ray enters CCD, so that CCD can only incude
To visible light, this makes it possible to make the image that DV takes consistent with the image that naked eyes are seen.
Infrared night vision is exactly under night vision state, and digital vedio recording chance sends out the infrared light being invisible to the naked eye and goes to illuminate
The object being taken turns off infrared filter, no longer stops that infrared ray enters CCD, infrared ray enters camera lens after object reflects
It is imaged, at this moment people institute is it is seen that the image formed by infrared reflection, rather than image formed by visible reflectance,
The image being invisible to the naked eye under dark surrounds can be taken at this time.
Infrared lamp is divided into luminous (infrared emission diode) infrared lamp of semiconducting solid and heat by its infrared light radiation mechanism
Two kinds of radiated infrared lamp.The infrared lamp of infrared-emitting diode is mainly used on open market, principle and characteristic are：By red
Luminous diode matrix forms illuminator outside.Infrared emission diode is by the high material of infrared radiation efficiency (common GaAs
GaAs PN junction) is made, additional forward bias excites infrared light to PN junction Injection Current.Wavelength 830 centered on spectral power distribution
~950nm, half-peak bandwidth about 40nm or so are distributed for narrowband, the range that can be experienced for common CCD B/W camera.It is most
Big advantage is can be entirely without red sudden and violent, (use 940~950nm wavelength infrared tube) or only faint red sudden and violent (red cruelly for have can
Show light) and long lifespan.
However, infrared simulation video camera is in actual application, if using remote power-feeding mode to infrared photography
Machine is powered, then the thermal camera of arrangement distance farther out will appear once opening infrared light light source, thermal camera is
The phenomenon that appearance is restarted repeatedly.
Invention content
The present invention provides a kind of control circuit, the method and devices of infrared lamp current, at least to solve in the related technology
Thermal camera is easily caused when being powered thermal camera using long range cable after opening infrared lamp to occur repeatedly
The problem of restarting phenomenon.
According to an aspect of the invention, there is provided a kind of control circuit of infrared lamp current.
The control circuit of infrared lamp current according to the ... of the embodiment of the present invention includes：Choke circuit, for opening infrared take the photograph
When infrared lamp inside camera, inhibit the amplitude of variation for passing through the electric current for the cable being powered to thermal camera；Microcontroller
Unit (MCU) circuit, one input end are connected with the power supply inside thermal camera, another input terminal and choke circuit phase
Connection, output end are connected with infrared lamp drive circuit, under inhibiting effect of the choke circuit to amplitude of variation, exporting
Control voltage, wherein control voltage is used to control the electric current by infrared lamp；Infrared lamp drive circuit is connected with MCU circuits
It connects, for the electric current for flowing through infrared lamp to be adjusted according to control voltage.
Preferably, choke circuit includes：First resistor；Operational amplifier, first input end are connect with first resistor,
Second input terminal forms closed circuit with output end, and output end is connected with second resistance；Second resistance, one end and output end
It is connected, the other end is connected with one end of capacitance；Capacitance, one end are connected with second resistance, the other end and first
Input terminal and first resistor are connected.
According to another aspect of the present invention, a kind of control method of infrared lamp current is provided.
The control method of infrared lamp current according to the ... of the embodiment of the present invention includes：It receives and comes from the of the generation of the first power supply
One voltage, wherein the first power supply is the power supply inside thermal camera；It is received via choke circuit and comes from the of second source
Two voltages, wherein second source is the power supply being powered for thermal camera by the cable of preset length, and choke circuit is used
In when opening the infrared lamp inside thermal camera, inhibit the amplitude of variation of the electric current by cable；According to first voltage and
Second voltage obtains the value range of control voltage, wherein the value range for controlling voltage is used to control the electricity by infrared lamp
Stream；In the value range of control voltage control voltage is sent to infrared lamp.
Preferably, include according to the value range of first voltage and second voltage acquisition control voltage：Using first voltage,
The DC impedance of second voltage and the first power calculation cable, wherein the first power be thermal camera do not open it is infrared
Power when lamp；The second power is calculated according to second voltage and DC impedance, wherein the second power is the maximum of thermal camera
Power and the second power are more than the first power；The value range of control voltage is determined by the first power and the second power.
Preferably, include using first voltage, second voltage and the first power calculation DC impedance：Calculate second voltage
With the difference of first voltage；Calculate the first power and the ratio of first voltage；Division arithmetic is carried out to difference and ratio, is sought straight
Flow impedance.
Preferably, calculating the second power according to first voltage and DC impedance includes：Using second voltage and DC impedance
Calculate the electric current by cable；Multiplying is carried out with second voltage to the electric current by cable, seeks the second power.
According to another aspect of the invention, a kind of control device of infrared lamp current is provided.
The control device of infrared lamp current according to the ... of the embodiment of the present invention includes：First receiving module comes from for receiving
In the first voltage that the first power supply generates, wherein the first power supply is the power supply inside thermal camera；Second receiving module is used
In the second voltage for coming from second source via choke circuit reception, wherein second source is the cable by preset length
For the power supply that thermal camera is powered, choke circuit is used for when opening the infrared lamp inside thermal camera, inhibits logical
Cross the amplitude of variation of the electric current of cable；Acquisition module, the value for obtaining control voltage according to first voltage and second voltage
Range, wherein the value range for controlling voltage is used to control the electric current by infrared lamp；Sending module, in control voltage
Value range in infrared lamp send control voltage.
Preferably, acquisition module includes：First computing unit, for using first voltage, second voltage and the first work(
Rate calculates the DC impedance of cable, wherein the first power is power of the thermal camera when not opening infrared lamp；Second calculates
Unit, for calculating the second power according to second voltage and DC impedance, wherein the second power is the maximum work of thermal camera
Rate and the second power are more than the first power；Determination unit, for determining taking for control voltage by the first power and the second power
It is worth range.
Preferably, the first computing unit includes：First computation subunit, the difference for calculating second voltage and first voltage
Value；Second computation subunit, for calculating the first power and the ratio of first voltage；Third computation subunit, for difference
Division arithmetic is carried out with ratio, seeks DC impedance.
Preferably, the second computing unit includes：4th computation subunit, for being calculated using second voltage and DC impedance
Pass through the electric current of cable；5th computation subunit is sought for carrying out multiplying with second voltage to the electric current by cable
Second power.
Through the embodiment of the present invention, using choke circuit, for when opening the infrared lamp inside thermal camera, inhibiting
Pass through the amplitude of variation of the electric current for the cable being powered to thermal camera；MCU circuits, one input end and thermal camera
Internal power supply is connected, and another input terminal is connected with choke circuit, and output end is connected with infrared lamp drive circuit,
For under inhibiting effect of the choke circuit to amplitude of variation, output to control voltage, wherein control voltage is for controlling by red
The electric current of outer lamp；Infrared lamp drive circuit is connected with MCU circuits, for according to control voltage to flowing through the electric current of infrared lamp
It is adjusted, solves and easily cause infrared photography when being powered to thermal camera using long range cable in the related technology
Machine the problem of occurring to restart phenomenon repeatedly after opening infrared lamp, and then can long range power in the case of, infrared photography
Chance opens the power of infrared lamp according to cable impedance adjust automatically, so that it is guaranteed that the normal work of thermal camera.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and is constituted part of this application, this hair
Bright illustrative embodiments and their description are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the structure diagram of the control circuit of infrared lamp current according to the ... of the embodiment of the present invention；
Fig. 2 is the device connection diagram of choke circuit according to the preferred embodiment of the invention；
Fig. 3 is the flow chart of the control method of infrared lamp current according to the ... of the embodiment of the present invention；
Fig. 4 is the schematic diagram according to the preferred embodiment of the invention being powered using long range cable；
Fig. 5 is the equivalent schematic according to the preferred embodiment of the invention that powered using long range cable based on Fig. 4；
Fig. 6 is the schematic diagram of the control framework inside thermal camera according to the preferred embodiment of the invention；
Fig. 7 is the curve graph that infrared power according to the preferred embodiment of the invention is controlled by MCU；
Fig. 8 is the structural schematic diagram of infrared lamp drive circuit according to the preferred embodiment of the invention；
Fig. 9 is the structure diagram of the control device of infrared lamp current according to the ... of the embodiment of the present invention；
Figure 10 is the structure diagram of the control device of infrared lamp current according to the preferred embodiment of the invention.
Specific implementation mode
Come that the present invention will be described in detail below with reference to attached drawing and in conjunction with the embodiments.It should be noted that not conflicting
In the case of, the features in the embodiments and the embodiments of the present application can be combined with each other.
In the following description, unless otherwise specified, by with reference to the action and behaviour executed by one or more computers
The symbolic indication of work describes present embodiments.Wherein, computer includes personal computer, server, mobile terminal
Etc. various products, used central processing unit (CPU), microcontroller, digital signal processor (DSP) etc. that there is processing chip to set
It is standby to be properly termed as computer.As such, it will be understood that this kind of action and operation that sometimes referred to as computer executes include calculating
The processing unit of machine is to indicating the manipulation of the electric signal of data with structured form.This manipulation transforms data or in computer
Storage system in position on safeguard it, in terms of this reconfigures or changes in such a way that those skilled in the art understands
The operation of calculation machine.Safeguard that the data structure of data is the physical bit of the memory with particular community defined in the format of data
It sets.However, although of the invention described in above-mentioned context, it does not mean restrictive, such as those skilled in the art
What member was understood, the various aspects of action and operation described below can also be realized with hardware.
Attached drawing is turned to, wherein identical reference label refers to identical element, the principle of the application is illustrated as closing at one
It is realized in suitable computing environment.It is described below based on the embodiments herein, and is not considered as about herein not
The alternative embodiment that is expressly recited and limit the application.
Following embodiment can be applied in computer, such as：It is applied in personal computer (PC).It can also be applied to
It uses in the mobile terminal in intelligent operating system, and is not limited to this at present.For the behaviour of computer or mobile terminal
Making system, there is no particular/special requirements, if contact can be detected, determine whether the contact is consistent with pre-defined rule, and according to
The attribute of the contact realizes corresponding function.
Fig. 1 is the structure diagram of the control circuit of infrared lamp current according to the ... of the embodiment of the present invention.As shown in Figure 1, this is red
The control circuit of outer lamp current may include：Choke circuit 10, for when opening the infrared lamp inside thermal camera, inhibiting
Pass through the amplitude of variation of the electric current for the cable being powered to thermal camera；MCU circuits 20, one input end and infrared photography
Power supply inside machine is connected, and another input terminal is connected with choke circuit 10, output end and infrared lamp drive circuit 30
It is connected, under inhibiting effect of the choke circuit to amplitude of variation, output to control voltage, wherein control voltage is for controlling
The electric current that system passes through infrared lamp；Infrared lamp drive circuit 30 is connected with MCU circuits 20, for according to control voltage to flowing through
The electric current of infrared lamp is adjusted.
In the related technology, thermal camera is easily caused when being powered thermal camera using long range cable opening
Occur to restart phenomenon repeatedly after opening infrared lamp.Using circuit as shown in Figure 1, by increasing chokes electricity inside thermal camera
Road, if long range cable is used to be powered for thermal camera, when opening infrared lamp, using choke circuit to logical
The amplitude of variation for crossing the electric current of cable is inhibited, and immediate current spike is eliminated, and pass through the circuit of infrared lamp gradually on
It rises, thus solves and easily cause thermal camera when being powered to thermal camera using long range cable in the related technology
The problem of occurring to restart phenomenon repeatedly after opening infrared lamp, and then can be in the case where long range is powered, thermal camera
The power that infrared lamp can be opened according to cable impedance adjust automatically, so that it is guaranteed that the normal work of thermal camera.
Preferably, Fig. 2 is the device connection diagram of choke circuit according to the preferred embodiment of the invention.As shown in Fig. 2,
Choke circuit 10 may include：First resistor 100；Operational amplifier 102, first input end are connect with first resistor 100,
Second input terminal forms closed circuit with output end, and output end is connected with second resistance 104；Second resistance 104, one end with
Output end is connected, and the other end is connected with one end of capacitance 106；Capacitance 106, one end are connected with second resistance 104,
Its other end is connected with first input end and first resistor 100.
In a preferred embodiment, the function of the choke circuit is：It prevents from opening due to infrared lamp, cable current burst is anxious
Play rises, and the case where leading to Vin Voltage Drops occurs.Meanwhile can by first resistor, second resistance and capacitance into
Capable suitably value to prevent the power frequency 50Hz interference on cable from entering thermal camera, and then is effectively prevented video figure
As there is noise because of city's electrical interference.
Fig. 3 is the flow chart of the control method of infrared lamp current according to the ... of the embodiment of the present invention.As shown in figure 3, this method
It may include following processing step：
Step S302：Receive the first voltage for coming from the generation of the first power supply, wherein the first power supply is in thermal camera
The power supply in portion；
Step S304：The second voltage for coming from second source is received via choke circuit, wherein second source is to pass through
The cable of preset length is the power supply that thermal camera is powered, and choke circuit is used for red inside unlatching thermal camera
When outer lamp, inhibit the amplitude of variation of the electric current by cable；
Step S306：The value range of control voltage is obtained according to first voltage and second voltage, wherein control voltage
Value range is used to control the electric current by infrared lamp；
Step S308：In the value range of control voltage control voltage is sent to infrared lamp.
In the related technology, the reason of causing to restart repeatedly, can be divided into following two situations：
Reason one opens moment because excessive by the electric current of cable due to infrared lamp, is obtained so as to cause power work
Voltage is more than work minimum voltage Vmin；
Reason two, in the case of obtain underpower when infrared lamp of vidicon fully opens, i.e. Pn<Pmax<Pr.
Using method as shown in Figure 3, in the case where infrared lamp is not opened, thermal camera normal work output video
Signal.And infrared lamp is once opened, the immediate current generated on cable is excessive, by increasing chokes electricity inside thermal camera
Road is to eliminate immediate current spike so that when infrared lamp is opened, electric current gradually rises, without current spike.
Preferably, in step S306, the value range that control voltage is obtained according to first voltage and second voltage can be with
Including following operation：
Step S1：Using the DC impedance of first voltage, second voltage and the first power calculation cable, wherein first
Power is power of the thermal camera when not opening infrared lamp；
Step S2：The second power is calculated according to second voltage and DC impedance, wherein the second power is thermal camera
Maximum power and the second power are more than the first power；
Step S3：The value range of control voltage is determined by the first power and the second power.
Preferably, in step sl, it can be wrapped using first voltage, second voltage and the first power calculation DC impedance
Include following steps：
Step S11：Calculate the difference of second voltage and first voltage；
Step S12：Calculate the first power and the ratio of first voltage；
Step S13：Division arithmetic is carried out to difference and ratio, seeks DC impedance.
Preferably, in step s 2, it may include following operation to calculate the second power according to first voltage and DC impedance：
Step S21：The electric current by cable is calculated using second voltage and DC impedance；
Step S22：Multiplying is carried out with second voltage to the electric current by cable, seeks the second power.
Above-mentioned preferred implementation process is further described below in conjunction with Fig. 4 to preferred embodiment shown in Fig. 8.
Fig. 4 is the schematic diagram according to the preferred embodiment of the invention being powered using long range cable.As shown in figure 4,
If be powered using remote mode, the loss for considering to be happened on cable is had at this time, that is, must take into consideration confession
The DC impedance R of electric wire cable.And thermal camera manufacture when power (including：In the case of normal work, do not open red
The steady state power of outer lamp is Pn (being equivalent to above-mentioned first power) and total steady state power Pr of unlatching infrared lamp (is equivalent to above-mentioned
Second power)) it has determined.In general, it is necessary to ensure that power supply power P (voltage U) is more than Pr.
Fig. 5 is the equivalent schematic according to the preferred embodiment of the invention that powered using long range cable based on Fig. 4.Such as
Shown in Fig. 5, when remote power-feeding, it is necessary to consider the DC impedance R of long range cable.If DC impedance R is equivalent to
The internal resistance of power supply, then the maximum power that thermal camera can obtain is：Pmax=U^2/4R, such Pmax presence can not expire
The possibility of condition of the foot more than Pr.In this case once opening infrared lamp, thermal camera will be due to undertension
It powers off.And Pmax is greater than Pn in general, otherwise basic Video Output all cannot achieve, then
Thermal camera can retrieve the power more than Pn again, but infrared lamp is once again turned on, and will obtain the work(less than Pr
Rate, so that thermal camera constantly will restart phenomenon.
Fig. 6 is the schematic diagram of the control framework inside thermal camera according to the preferred embodiment of the invention.Fig. 7 is basis
The curve graph that the infrared power of the preferred embodiment of the present invention is controlled by MCU.As shown in Figure 6 and Figure 7, control mode may include：
Simulation light modulation and pulse width modulation (PWM) light modulation.In advance in MCU circuit built-in infrareds video camera involved phase at work
Close power parameter, wherein can include but is not limited to Pn, Pr, Pr=f (Vc) curve graph, the nominal operation electricity of thermal camera
Pressure is power supply voltage U.MCU controls the relationship of U and Pr.
In the case where infrared lamp is not opened, thermal camera normal work output vision signal.And it once opens infrared
Lamp, the immediate current generated on cable is excessive, and the effect of choke circuit, which is that, eliminates immediate current spike so that in infrared lamp
When unlatching, electric current gradually rises, without current spike.In normal work, MCU can be detected and is input to power module
Input voltage vin, and the DC impedance of power cable is obtained according to following formula 1：
R=(U-Uin)/(Pn/Uin) ... formula 1；
MCU can also extrapolate the maximum power that thermal camera can obtain according to following formula 2：
Pmax=U^2/4R ... formula 2；
At this point, MCU can be according to Pr=f (Vc) relational graph so that Pr=Pmax, and then obtain control infrared lamp and correspond to electricity
Press Vc.To in Pr power brackets, start infrared lamp.
Infrared lamp drive circuit can pass through according to the size of Vc to control after receiving the Vc for coming from MCU circuits
The electric current of infrared lamp.It, will be from 0~100% variation by the current value of infrared lamp at any voltage Vi.
Fig. 8 is the structural schematic diagram of infrared lamp drive circuit according to the preferred embodiment of the invention.As shown in figure 8, C0 is
Filter capacitor, R0 are current sampling resistor, and LED is infrared lamp, and L is afterflow inductance, and D1 is fly-wheel diode.Its principle is：
In the case where presetting Vi and Vc, using R0 to being sampled by the electric current of infrared lamp, then it is compared again with Vc,
Export the electric current that certain duty ratio PWM carrys out closed-loop control by infrared lamp.
Fig. 9 is the structure diagram of the control device of infrared lamp current according to the ... of the embodiment of the present invention.As shown in figure 9, this is red
The control device of outer lamp current may include：First receiving module 90, for receiving the first electricity for coming from the generation of the first power supply
Pressure, wherein the first power supply is the power supply inside thermal camera；Second receiving module 92, for coming via choke circuit reception
From in the second voltage of second source, wherein second source is powered for thermal camera by the cable of preset length
Power supply, choke circuit is used to, when opening the infrared lamp inside thermal camera, inhibit the variation width by the electric current of cable
Degree；Acquisition module 94, the value range for obtaining control voltage according to first voltage and second voltage, wherein control voltage
Value range be used to control electric current by infrared lamp；Sending module 96 is used in the value range of control voltage to red
Outer lamp sends control voltage.
Using device as shown in Figure 9, solves and thermal camera is being carried out using long range cable in the related technology
Thermal camera is easily caused when power supply the problem of occurring to restart phenomenon repeatedly after opening infrared lamp, and then can be supplied in long range
In the case of electricity, infrared photography chance opens the power of infrared lamp according to cable impedance adjust automatically, so that it is guaranteed that infrared photography
The normal work of machine.
Preferably, as shown in Figure 10, acquisition module 94 may include：First computing unit 940, for using the first electricity
Pressure, second voltage and the first power calculation cable DC impedance, wherein the first power be thermal camera do not open it is red
Power when outer lamp；Second computing unit 942, for calculating the second power according to second voltage and DC impedance, wherein second
Power is the maximum power of thermal camera and the second power is more than the first power；Determination unit 944, for passing through the first power
The value range of control voltage is determined with the second power.
Preferably, the first computing unit 940 may include：First computation subunit (not shown), for calculating the
The difference of two voltages and first voltage；Second computation subunit (not shown), for calculating the first power and first voltage
Ratio；Third computation subunit (not shown) seeks DC impedance for carrying out division arithmetic to difference and ratio.
Preferably, the second computing unit 942 may include：4th computation subunit (not shown), for using the
Two voltages and DC impedance calculate the electric current by cable；5th computation subunit (not shown), for passing through cable
Electric current and second voltage carry out multiplying, seek the second power.
It can be seen from the above description that above example implements following technique effect (it should be noted that these
Effect is the effect that certain preferred embodiments can reach)：The technical solution provided using the embodiment of the present invention, can be in length
In the case of distance power supply, infrared photography chance opens the power of infrared lamp according to cable impedance adjust automatically, so that it is guaranteed that red
The normal work of outer video camera.
Obviously, those skilled in the art should be understood that each module of the above invention or each step can be with general
Computing device realize that they can be concentrated on a single computing device, or be distributed in multiple computing devices and formed
Network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are stored
It is performed by computing device in the storage device, and in some cases, it can be with different from shown in sequence execution herein
The step of going out or describing, either they are fabricated to each integrated circuit modules or by them multiple modules or
Step is fabricated to single integrated circuit module to realize.In this way, the present invention is not limited to any specific hardware and softwares to combine.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of control circuit of infrared lamp current, which is characterized in that including：
Choke circuit, for when opening the infrared lamp inside thermal camera, inhibiting by being carried out to the thermal camera
The amplitude of variation of the electric current of the cable of power supply；
Micro-control unit MCU circuits, one input end are connected with the power supply inside the thermal camera to obtain the first electricity
Pressure, another input terminal are connected with the choke circuit to obtain second voltage, output end and infrared lamp drive circuit phase
Connection obtains the value range of control voltage according to the first voltage and the second voltage, to export control voltage,
In, the control voltage is used to control the electric current by the infrared lamp；
The infrared lamp drive circuit is connected with the MCU circuits, for described infrared to flowing through according to the control voltage
The electric current of lamp is adjusted.
2. circuit according to claim 1, which is characterized in that the choke circuit includes：
First resistor；
Operational amplifier, first input end are connect with the first resistor, and the second input terminal is closed back with output end formation
Road, the output end are connected with second resistance；
The second resistance, one end are connected with the output end, and the other end is connected with one end of capacitance；
The capacitance, one end are connected with the second resistance, the other end and the first input end and described first
Resistance is connected.
3. a kind of control method of infrared lamp current, which is characterized in that including：
Receive the first voltage for coming from the generation of the first power supply, wherein first power supply is the power supply inside thermal camera；
The second voltage for coming from second source is received via choke circuit, wherein the second source is to pass through preset length
Cable be the power supply that is powered of the thermal camera, the choke circuit is used to open inside the thermal camera
Infrared lamp when, inhibit the amplitude of variation by the electric current of the cable；
The value range of control voltage is obtained according to the first voltage and the second voltage, wherein the control voltage
Value range is used to control the electric current by the infrared lamp；
In the value range of the control voltage control voltage is sent to the infrared lamp.
4. according to the method described in claim 3, it is characterized in that, obtaining institute according to the first voltage and the second voltage
State control voltage value range include：
Using the DC impedance of cable described in the first voltage, the second voltage and the first power calculation, wherein described
First power is power of the thermal camera when not opening the infrared lamp；
The second power is calculated according to the second voltage and the DC impedance, wherein second power is described infrared take the photograph
The maximum power of camera and second power are more than first power；
The value range of the control voltage is determined by first power and second power.
5. according to the method described in claim 4, it is characterized in that, using the first voltage, the second voltage and institute
Stating DC impedance described in the first power calculation includes：
Calculate the difference of the second voltage and the first voltage；
Calculate the ratio of first power and the first voltage；
Division arithmetic is carried out to the difference and the ratio, seeks the DC impedance.
6. according to the method described in claim 4, it is characterized in that, calculating institute according to the first voltage and the DC impedance
Stating the second power includes：
The electric current by the cable is calculated using the second voltage and the DC impedance；
Multiplying is carried out with the second voltage to the electric current by the cable, seeks second power.
7. a kind of control device of infrared lamp current, which is characterized in that including：
First receiving module, for receiving the first voltage for coming from the generation of the first power supply, wherein first power supply is infrared
Power supply inside video camera；
Second receiving module, for receiving the second voltage for coming from second source via choke circuit, wherein second electricity
Source is the power supply being powered for the thermal camera by the cable of preset length, and the choke circuit is used to open institute
When stating the infrared lamp inside thermal camera, inhibit the amplitude of variation of the electric current by the cable；
Acquisition module, the value range for obtaining control voltage according to the first voltage and the second voltage, wherein institute
The value range for stating control voltage is used to control the electric current by the infrared lamp；
Sending module, for sending the control voltage to the infrared lamp in the value range of the control voltage.
8. device according to claim 7, which is characterized in that the acquisition module includes：
First computing unit, for using cable described in the first voltage, the second voltage and the first power calculation
DC impedance, wherein first power is power of the thermal camera when not opening the infrared lamp；
Second computing unit, for calculating the second power according to the second voltage and the DC impedance, wherein described second
Power is the maximum power of the thermal camera and second power is more than first power；
Determination unit, the value range for determining the control voltage by first power and second power.
9. device according to claim 8, which is characterized in that first computing unit includes：
First computation subunit, the difference for calculating the second voltage and the first voltage；
Second computation subunit, the ratio for calculating first power and the first voltage；
Third computation subunit seeks the DC impedance for carrying out division arithmetic to the difference and the ratio.
10. device according to claim 8, which is characterized in that second computing unit includes：
4th computation subunit, for calculating the electric current by the cable using the second voltage and the DC impedance；
5th computation subunit seeks institute for carrying out multiplying with the second voltage to the electric current by the cable
State the second power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410318869.0A CN105338682B (en) | 2014-07-04 | 2014-07-04 | Control circuit, the method and device of infrared lamp current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410318869.0A CN105338682B (en) | 2014-07-04 | 2014-07-04 | Control circuit, the method and device of infrared lamp current |
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| CN105338682A CN105338682A (en) | 2016-02-17 |
| CN105338682B true CN105338682B (en) | 2018-09-18 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102168833A (en) * | 2010-02-23 | 2011-08-31 | 松下电工株式会社 | Lighting fixture |
| CN103096572A (en) * | 2011-11-04 | 2013-05-08 | 东芝照明技术株式会社 | Power Supply For Lighting And Luminaire |
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| CN102017805A (en) * | 2008-04-24 | 2011-04-13 | 英迪斯私人有限公司 | Power control |
| CN202750301U (en) * | 2012-09-07 | 2013-02-20 | 宁波电业局 | Automatic control device for lighting |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102168833A (en) * | 2010-02-23 | 2011-08-31 | 松下电工株式会社 | Lighting fixture |
| CN103096572A (en) * | 2011-11-04 | 2013-05-08 | 东芝照明技术株式会社 | Power Supply For Lighting And Luminaire |
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