CN108668052A - A kind of filter switches the filter switching circuit and monitoring device of chip, video camera - Google Patents
A kind of filter switches the filter switching circuit and monitoring device of chip, video camera Download PDFInfo
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- CN108668052A CN108668052A CN201710210045.5A CN201710210045A CN108668052A CN 108668052 A CN108668052 A CN 108668052A CN 201710210045 A CN201710210045 A CN 201710210045A CN 108668052 A CN108668052 A CN 108668052A
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 22
- 230000005611 electricity Effects 0.000 claims abstract description 23
- 238000005286 illumination Methods 0.000 claims abstract description 18
- 238000005070 sampling Methods 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
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- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 235000008434 ginseng Nutrition 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/66—Remote control of cameras or camera parts, e.g. by remote control devices
- H04N23/663—Remote control of cameras or camera parts, e.g. by remote control devices for controlling interchangeable camera parts based on electronic image sensor signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
Abstract
A kind of filter switches the filter switching circuit and monitoring device of chip, video camera, is suitable for electronic technology field.A kind of filter switching chip, is connected with the filter unit in power supply, photo resistance and video camera, and filter switching chip includes：In-line power unit, reference signal unit and comparing unit；The first direct current of working direct current electricity output and the second direct current that in-line power unit is provided according to power supply, reference signal unit are electrically generated the first reference signal, reference signal of second direct current as comparing unit according to the first direct current；When intensity of illumination around photo resistance is less than or equal to predetermined threshold value, photo resistance generates luminance signal according to intensity of illumination, and luminance signal is sent to comparing unit, so that comparing unit generates switching signal according to reference signal and luminance signal, and then controls filter unit and carry out filter switching.So that the circuit of control filter switching is simpler in monitoring device, production cost is reduced.
Description
Technical field
The invention belongs to the filter switching circuits of electronic technology field more particularly to a kind of filter switching chip, video camera
And monitoring device.
Background technology
In the safety-protection system of city, whether the normal work of monitoring device (such as video camera) directly determines safety-protection system
It is capable of providing crime evidence obtaining.For example, in order to enable video camera to remain able to carry out video monitoring or image when light is weaker
Acquisition is then to trigger filter when light is weaker by increasing filter and its peripheral circuit in the prior art, to ensure to image
The collected picture of machine institute is clear enough.
Although realizing that the filter of video camera automatically switches by increasing filter switching circuit, due in the prior art
When controlling the switching of video camera filter, needs to be divided by accessing multiple photo resistance, can realize oneself of filter
Dynamic switching.Therefore, the complicated of filter switching circuit exists in the prior art, required electronic component is more, and cost is excessively high
The problem of.
Invention content
An embodiment of the present invention provides the filter switching circuit and monitoring device of a kind of filter switching chip, video camera, purports
Solving the problems, such as that the production cost that existing monitoring device exists caused by the switching circuit of filter is complicated is high.
The purpose of the present invention is to provide in a kind of filter switching chip, with power supply, photo resistance and video camera
Filter unit be connected, for carrying out filter switching to the filter unit, filter switching chip includes：In-line power list
Member, reference signal unit and comparing unit；
The first direct current of working direct current electricity output and second that the in-line power unit is provided according to the power supply
Direct current, the reference signal unit are electrically generated the first reference signal, the second direct current conduct according to first direct current
The reference signal of the comparing unit；
When intensity of illumination around the photo resistance is less than or equal to predetermined threshold value, the photo resistance is according to
Intensity of illumination generates luminance signal, and the luminance signal is sent to the comparing unit so that the comparing unit according to
The reference signal generates switching signal with the luminance signal, and then controls the filter unit and carry out filter switching.
Another object of the present invention is to provide a kind of filter switching circuit of video camera, be set in video camera, and with confession
Power supply is connected with the filter unit in the video camera, and the filter switching circuit includes：Sampling resistor and photo resistance, institute
Stating filter switching circuit further includes：Filter switches chip, the first inductance, light emitting diode, the first diode and the first capacitance；
Wherein, the filter switching chip is that filter as described above switches chip；
The input electrical signal sampling end of the filter switching chip is connected with the first end of the sampling resistor, the sampling
The first end for connecing first diode altogether with electrical input of the second end of resistance and filter switching chip, described first
The interior circuit ground end that the second end of diode switches chip with the filter is connected, the first end of the light emitting diode and institute
The first end for stating the first capacitance connects the input electrical signal sampling end of filter switching chip altogether, and the second of the light emitting diode
The second end of end and first capacitance connects the first end of first inductance, second end and the filter of first inductance altogether
The inductor incoming end that mirror switches chip is connected, the filter switching control end of the filter switching chip and the filter unit phase
Even, the first end of the photo resistance is connected with the Enable Pin of filter switching chip, the second termination of the photo resistance
Ground；
Wherein, when the intensity of illumination around the photo resistance is less than or equal to predetermined threshold value, the photo resistance
Resistance value is equal to or more than preset resistive value, and then adjusts the enabled terminal potential of the filter switching chip, triggers the filter switching
Chip operation, and light the light emitting diode so that filter unit described in the filter switching chip controls carries out filter and cuts
It changes.
Another object of the present invention is to provide a kind of monitoring devices, are connected with background server, the monitoring device packet
Include the filter switching circuit of video camera as described above.
Filter list in a kind of filter switching chip, with power supply, photo resistance and video camera provided by the invention
Member is connected, and for carrying out filter switching to filter unit, filter switching chip includes：In-line power unit, reference signal unit
And comparing unit；The first direct current of working direct current electricity output and the second direct current that in-line power unit is provided according to power supply
Electricity, reference signal unit are electrically generated the first reference signal according to the first direct current, and the second direct current is believed as the reference of comparing unit
Number；When intensity of illumination around photo resistance is less than or equal to predetermined threshold value, photo resistance generates illumination according to intensity of illumination
Signal, and luminance signal is sent to comparing unit so that comparing unit generates switching letter according to reference signal and luminance signal
Number, and then control filter unit and carry out filter switching.So that the circuit of control filter switching is simpler in monitoring device, reduce
Production cost.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of filter switching chip provided in an embodiment of the present invention；
Fig. 2 is a kind of concrete structure schematic diagram of filter switching chip provided in an embodiment of the present invention；
Fig. 3 is the physical circuit figure of reference voltage unit in a kind of filter switching chip provided in an embodiment of the present invention；
Fig. 4 is the physical circuit figure of reference current unit in a kind of filter switching chip provided in an embodiment of the present invention；
Fig. 5 is the physical circuit figure of comparing unit in a kind of filter switching chip provided in an embodiment of the present invention；
Fig. 6 is a kind of structural schematic diagram of the filter switching circuit of video camera provided in an embodiment of the present invention；
Fig. 7 is a kind of structural schematic diagram of monitoring device provided in an embodiment of the present invention.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
An embodiment of the present invention provides the filter switching circuit and monitoring device of a kind of filter switching chip, video camera, purports
Solving the problems, such as that the production cost that existing monitoring device exists caused by the switching circuit of filter is complicated is high.
The realization of the present invention is described in detail below in conjunction with specific embodiment：
Fig. 1 shows that a kind of structure of filter switching chip of the embodiment of the present invention illustrates only and this for convenience of description
The relevant part of inventive embodiments.
As shown in Figure 1, in a kind of filter switching chip 100, with power supply 110, photo resistance RE and video camera
Filter unit 120 is connected, and for carrying out filter switching to filter unit 120, filter switching chip 100 includes：In-line power list
Member 10, reference signal unit 20 and comparing unit 30.
The first direct current of working direct current electricity output and the second direct current that in-line power unit 10 is provided according to power supply 110
Electricity, reference signal unit 20 are electrically generated the first reference signal, ginseng of second direct current as comparing unit 30 according to the first direct current
Examine signal.
When intensity of illumination around photo resistance RE is less than or equal to predetermined threshold value, photo resistance RE is according to intensity of illumination
Luminance signal is generated, and luminance signal is sent to comparing unit 30 so that comparing unit 30 is believed according to reference signal and illumination
Number switching signal is generated, and then controls filter unit 120 and carry out filter switching.
It should be noted that in-line power unit 10 carries out voltage conversion to the working direct current electricity that power supply 110 provides,
And then the first direct current VDD is exported to reference signal unit 20, exporting the second direct current to comparing unit 30 is used as with reference to signal
VREF。
Further, as shown in Figure 1, the input terminal of in-line power unit 10 is the electricity consumption input of filter switching chip 100
End, the input terminal VIN of in-line power unit 10 are connected with 110 output end of power supply, the first output of in-line power unit 10
End is connected with the input terminal of reference signal unit 20, and the second output terminal of in-line power unit 10 is believed with the reference of comparing unit 30
Number input terminal is connected, and the first output end of reference signal unit 20 is connected with the input terminal of comparing unit 30, comparing unit 30
Input terminal is the Enable Pin EN that filter switches chip 100, and the input terminal of comparing unit 30 is connected with the first end of photo resistance RE,
The second end of photo resistance RE is grounded, and the output end of comparing unit 30 is the filter switching control end that filter switches chip 100
The output end of IRC, comparing unit are connected with the controlled end of filter unit.
It is understood that the input terminal VIN of in-line power unit 10 is the power input that filter switches chip 100.
As shown in Figure 1, filter switching chip 100 further includes：Current detecting unit 40, power tube driving unit 50, excess temperature
Protection location 60 and power tube 70.
Reference signal unit 20 also generates the second reference signal according to the first direct current, and current detecting unit 40 is to power supply electricity
The working direct current electricity that source 110 provides is sampled, to obtain input electrical signal, current detecting unit 40 according to input electrical signal with
Second reference signal generates driving control signal, and driving control signal is sent to power tube driving unit 50, to drive work(
Rate pipe 70.
When over-temperature protection unit 60 detects that power tube driving unit 50 is more than in advance according to the temperature that input electrical signal works
If when temperature threshold, over-temperature protection unit 60 controls power tube driving unit 50 and is stopped.
Further, as shown in Figure 1,
The first input end of current detecting unit 40 is the input electrical signal sampling end ISE that filter switches chip 100, is used for
The working direct current electricity provided power supply 110 samples, to obtain input electrical signal.
Second input terminal of current detecting unit 40 is connected with the input terminal of in-line power unit 10, current detecting unit 40
Third input terminal be connected with the second output terminal of reference signal unit 20, the output end and gate driving of current detecting unit 40
The input terminal of unit 50 is connected, and the test side of over-temperature protection unit 60 is connected with the controlled end of drive element of the grid 50, and grid drives
The output end of moving cell 50 is connected with the controlled end of power tube 70, and the hot end of power tube 70 is that filter switches chip 100
Inductor incoming end LX, the cold end of power tube are the interior circuit ground end PGND that filter switches chip 100.
It should be noted that since the hot end of power tube 70 is the inductor incoming end LX that filter switches chip 100,
The cold end of power tube is the interior circuit ground end PGND that filter switches chip 100, when warm protection location 60 controls power tube
When driving unit 50 is stopped, corresponding power tube 70 ends, so that filter switching chip 100 is stopped, causes
Switch the external circuit open circuit that the inductor incoming end LX of chip 100 is connected with filter, or causes to switch chip 100 with filter
The connected external circuit open circuits of interior circuit ground end PGND.
The concrete structure for switching chip Fig. 2 shows a kind of filter of the embodiment of the present invention illustrates only for convenience of description
With the relevant part of the embodiment of the present invention.
As shown in Fig. 2, reference signal unit 20 includes：Reference voltage unit 21 and reference current unit 22.
Signal list on the basis of the node that the input terminal of reference voltage unit 21 is connected with the input terminal of reference current unit 22
The input terminal of member 20, the first output end of reference voltage unit 21 is connected with the output end of reference current unit 22, and forms base
First output end of calibration signal unit 20, the second output of signal element 20 on the basis of the second output terminal of reference voltage unit 21
End.
Reference voltage unit 21 is electrically generated third direct current and the second reference signal, reference current unit according to the first direct current
22 are electrically generated the 4th direct current according to the first direct current, and third direct current is superimposed to form the first reference signal with the 4th direct current.
It should be noted that reference voltage unit 21 is electrically generated third direct current, the third direct current according to the first direct current
Electricity is positive temperature coefficient direct current, and reference current unit 22 is electrically generated the 4th direct current, the 4th direct current according to the first direct current
Electricity is negative temperature coefficient direct current, therefore, is superimposed with the 4th direct current by the third direct current and forms the first benchmark letter
Number be zero-temperature coefficient direct current.Wherein, positive temperature coefficient direct current is size of current is increased with temperature and increases, negative temperature system
Number direct current is size of current is reduced with temperature and reduces.
Fig. 3 shows the physical circuit of reference voltage unit in a kind of filter switching chip of the embodiment of the present invention, such as Fig. 3 institutes
Show, reference voltage unit 21 includes：First switch pipe Q1, second switch pipe Q2, third switching tube Q3, the 4th switching tube Q4,
Five switching tube Q5, first resistor R1, second resistance R2,3rd resistor R3 and the first amplifier T1.
The controlled end of first switch pipe Q1 and the controlled end of second switch pipe Q2 are grounded altogether, the high potential of first switch pipe Q1
End is connected with the controlled end of first switch pipe Q1, the controlled end phase of the hot end and second switch pipe Q2 of second switch pipe Q2
Even, the positive input of the cold end of first switch pipe Q1 and the first amplifier T1 connect the first end of 3rd resistor R3 altogether, the
The cold end of two switching tube Q2 is connected with the first end of first resistor R1, the second end of first resistor R1 and the first amplifier T1
Negative input connect the first end of second resistance R2 altogether, the second end of second resistance R2 connects altogether with the second end of 3rd resistor R3
The cold end of third switching tube Q3, the controlled end of third switching tube Q3 are connected with the output end of the first amplifier T1, and third is opened
It closes pipe Q3 hot ends with the hot end of the 5th switching tube Q5 to be connected, the hot end and the 5th switching tube of the 5th switching tube Q5
The controlled end of Q5 connects the controlled end of the 4th switching tube Q4, the low electricity of the cold end and the 4th switching tube Q4 of the 5th switching tube Q5 altogether
The input terminal of voltage cell 21 on the basis of the connected node in position end, voltage cell 21 on the basis of the hot end of the 4th switching tube Q4
The first output end.
As a kind of possible realization method of the present invention, first switch pipe Q1 and second switch pipe Q2 is respectively positive-negative-positive three
Pole pipe Q1 and PNP type triode Q2.Wherein, the cold end of the extremely described first switch pipe Q1 of transmitting of PNP type triode Q1,
The hot end of the extremely described first switch pipe Q1 of PNP type triode Q1 current collections, PNP type triode Q1 base stages are opened for described first
Close the controlled end of pipe Q1.
It should be noted that first switch pipe Q1 and second switch pipe Q2 are the triode that emitter area is different, the two
Between the difference of tube voltage drop increased with the raising of temperature, since the clamping action of the first amplifier T1 makes first switch pipe Q1
Tube voltage drop equal to second switch pipe Q2 tube voltage drop and second resistance R102 the sum of pressure drop.So that first resistor R101 is upper
The electric current of positive temperature coefficient is crossed, then passes through third switching tube Q3, the 4th switching tube Q4 and the electric current of the 5th switching tube Q5 compositions
Mirror mirror image exports.
Fig. 4 shows the physical circuit of reference current unit in a kind of filter switching chip of the embodiment of the present invention, such as Fig. 4 institutes
Show, reference current unit 22 includes：6th switching tube Q6, the 7th switching tube Q7, the 8th switching tube Q8, the 9th switching tube Q9,
Ten switching tube Q10, the 11st switching tube Q11, the 12nd switching tube Q12, the 13rd switching tube Q13, the 14th switching tube Q14,
15th switching tube Q15, sixteenmo close pipe Q16, the 4th resistance R4 and the 5th resistance R5.
Hot end, the controlled end of the 6th switching tube Q6 and the first end of the 4th resistance R4 of 6th switching tube Q6 connects altogether
The cold end on ground, the 6th switching tube Q6 is connected with the cold end of the 7th switching tube Q7, the controlled end of the 7th switching tube Q7 with
The controlled end of 8th switching tube Q8 is connected, and the cold end of the 8th switching tube Q8 is connected with the second end of the 4th resistance R4, and the 7th
The controlled end of the hot end of switching tube Q7 and the 7th switching tube Q7 connect the cold end of the 9th switching tube Q9, the 9th switching tube altogether
The controlled end of Q9 is connected with the controlled end of the tenth switching tube Q10, the cold end of the tenth switching tube Q10 and the 8th switching tube Q8's
Hot end is connected, and the controlled end of the 9th switching tube Q9 and the hot end of the 9th switching tube Q9 meet the 11st switching tube Q11 altogether
Hot end, the hot end of the tenth switching tube Q10 and the first end of the 5th resistance R5 connect altogether the 12nd switching tube Q12 by
End is controlled, the second end and the hot end of the 12nd switching tube Q12 of the 5th resistance R5 connect the controlled of the 14th switching tube Q14 altogether
End, the controlled end of the controlled end and the 12nd switching tube Q12 of the 11st switching tube Q11 connect the controlled of the 13rd switching tube Q13 altogether
End, the controlled end of the 11st switching tube Q11 are connected with the hot end of the 14th switching tube Q14, the 12nd switching tube Q12's
Cold end is connected with the hot end of the 15th switching tube Q15, and the cold end and sixteenmo of the 13rd switching tube Q13 close
The hot end of pipe Q16 is connected, and the output end of current unit on the basis of the hot end of the 13rd switching tube Q13, the 14th opens
The controlled end of the controlled end and the 15th switching tube Q15 that close pipe Q14 connects the controlled end that sixteenmo closes pipe Q16 altogether, and the 14th opens
The cold end of the cold end and the 15th switching tube Q15 that close pipe Q14 connects the cold end that sixteenmo closes pipe Q16 altogether, and
Input node is formed, the input terminal of current unit 22 on the basis of input node.
As a kind of possible realization method of the present invention, the 6th switching tube Q6 is PNP type triode Q6, PNP type triode
The cold end of the extremely described 6th switching tube Q6 of transmitting of Q6, the extremely described 6th switching tube Q6 of PNP type triode Q6 current collections
Hot end, PNP type triode Q6 base stages be the 6th switching tube Q6 controlled end.
It should be noted that the voltage between the emitter and base stage of PNP type triode Q6 is reduced with the raising of temperature,
Due to the clamping action of current mirror make the emitter of the pressure drop of the 4th resistance R4 equal to PNP type triode Q6 and base stage it
Between voltage so that flow through negative temperature electric current on the 4th resistance R4, and pass through the 11st switching tube Q11, the 12nd switching tube
Q12, the 13rd switching tube Q13, the 14th switching tube Q14, the 15th switching tube Q15 and sixteenmo close pipe Q16 compositions
Current mirroring circuit mirror image exports.
Fig. 5 shows the physical circuit of comparing unit in a kind of filter switching chip of the embodiment of the present invention, as shown in figure 4,
Comparing unit 30 includes：Buffer D1 and Schmidt trigger D2.
The reference signal input terminal of Schmidt trigger D3 is connected with the reference signal input terminal of buffer D1, and composition compares
The reference signal input terminal of unit 30, the input terminal of Schmidt trigger D2 are the input terminal of comparing unit 30, schmidt trigger
The output end of device D2 is connected with the input terminal of buffer D1, and the output end of buffer D1 is the output end of comparing unit 30.
It is understood that since a kind of filter provided in the present embodiment switches the specific implementation mode of chip 100
It has been elaborated in the above-described embodiments with operation principle, therefore, details are not described herein again.
The present invention also aims to provide a kind of filter switching circuit 200 of video camera, as shown in fig. 6, video camera
Filter switching circuit 200 is set in video camera, and is connected with the filter unit 120 in power supply 110 and video camera, and filter is cut
Changing circuit 200 includes：Sampling resistor RS and photo resistance RE, filter switching circuit 200 further include：Filter switches chip U1, the
One inductance L1, Light-emitting diode LED, the first diode D1 and the first capacitance C1.Wherein, filter switching chip U1 is above-mentioned reality
Apply the filter switching chip 100 in example.
The input electrical signal sampling end ISE of filter switching chip U1 is connected with the first end of sampling resistor RS, sampling resistor
The first end for meeting the first diode D1 altogether with electrical input VIN of the second end of RS and filter switching chip U1, the first diode
The second end of D1 is connected with the inductor incoming end LX of filter switching chip U1, the first end of Light-emitting diode LED and the first electricity
The first end for holding C1 meets the input electrical signal sampling end ISE of filter switching chip U1 altogether, the second end of Light-emitting diode LED and the
The second end of one capacitance C1 connects the first end of the first inductance L1, the sense of the second end and filter switching chip U1 of the first inductance L1 altogether
Device incoming end LX is answered to be connected, the filter switching control end IRC of filter switching chip U1 is connected with filter unit 120, photo resistance
The first end of RE is connected with the Enable Pin EN of filter switching chip U1, the second end ground connection of photo resistance RE.
Wherein, when the intensity of illumination around photo resistance RE is less than or equal to predetermined threshold value, the resistance value of photo resistance RE
Equal to or more than preset resistive value, and then the Enable Pin EN current potentials of filter switching chip U1 are adjusted, triggering filter switches chip U1 works
Make, and light Light-emitting diode LED so that filter switches chip U1 control filters unit 120 and carries out filter switching.
Another object of the present invention is to provide a kind of monitoring device, as shown in fig. 7, a kind of monitoring device 300, with backstage
Server 210 is connected, and monitoring device 300 includes：Power supply 110 and filter unit 120, monitoring device 300 further include above-mentioned
The filter switching circuit 200 of video camera in embodiment.
Due to a kind of monitoring device specific implementation mode related to the present invention and work original provided in the present embodiment
Reason has elaborated in the above-described embodiments, and therefore, details are not described herein again.
Filter list in a kind of filter switching chip, with power supply, photo resistance and video camera provided by the invention
Member is connected, and for carrying out filter switching to filter unit, filter switching chip includes：In-line power unit, reference signal unit
And comparing unit；The first direct current of working direct current electricity output and the second direct current that in-line power unit is provided according to power supply
Electricity, reference signal unit are electrically generated the first reference signal according to the first direct current, and the second direct current is believed as the reference of comparing unit
Number；When intensity of illumination around photo resistance is less than or equal to predetermined threshold value, photo resistance generates illumination according to intensity of illumination
Signal, and luminance signal is sent to comparing unit so that comparing unit generates switching letter according to reference signal and luminance signal
Number, and then control filter unit and carry out filter switching.So that the circuit of control filter switching is simpler in monitoring device, reduce
Production cost.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (10)
1. a kind of filter switches chip, it is connected with the filter unit in power supply, photo resistance and video camera, for institute
It states filter unit and carries out filter switching, which is characterized in that the filter switches chip and includes：In-line power unit, reference signal
Unit and comparing unit；
The first direct current of working direct current electricity output and the second direct current that the in-line power unit is provided according to the power supply
Electricity, the reference signal unit are electrically generated the first reference signal according to first direct current, described in second direct current is used as
The reference signal of comparing unit；
When intensity of illumination around the photo resistance is less than or equal to predetermined threshold value, the photo resistance is according to the illumination
Intensity generates luminance signal, and the luminance signal is sent to the comparing unit so that the comparing unit is according to
Reference signal generates switching signal with the luminance signal, and then controls the filter unit and carry out filter switching.
2. filter as described in claim 1 switches chip, which is characterized in that the input terminal of the in-line power unit is described
Filter switching chip uses electrical input, the input terminal of the in-line power unit to be connected with the power supply output end, institute
The first output end for stating in-line power unit is connected with the input terminal of the reference signal unit, and the of the in-line power unit
Two output ends are connected with the reference signal input terminal of the comparing unit, the first output end of the reference signal unit with it is described
The input terminal of comparing unit is connected, and the input terminal of the comparing unit is the Enable Pin that the filter switches chip, the comparison
The input terminal of unit is connected with the first end of the photo resistance, the second end ground connection of the photo resistance, the comparing unit
Output end be filter switching control end that the filter switches chip, the output end of the comparing unit and the filter unit
Controlled end be connected.
3. filter as claimed in claim 1 or 2 switches chip, which is characterized in that the filter switches chip and further includes：Electric current
Detection unit, power tube driving unit, over-temperature protection unit and power tube；
The reference signal unit also generates the second reference signal according to first direct current, and the current detecting unit is to institute
The working direct current electricity for stating power supply offer is sampled, and to obtain input electrical signal, the current detecting unit is according to
Input electrical signal generates driving control signal with second reference signal, and the driving control signal is sent to the work(
Rate pipe driving unit, to drive the power tube；
When the over-temperature protection unit detects that the temperature that the power tube driving unit works according to the input electrical signal is big
When preset temperature threshold, the over-temperature protection unit controls the power tube driving unit and is stopped.
4. filter as claimed in claim 3 switches chip, which is characterized in that the first input end of the current detecting unit is
The input electrical signal sampling end of the filter switching chip, the working direct current electricity for providing the power supply are adopted
Sample, to obtain the input electrical signal；
Second input terminal of the current detecting unit is connected with the input terminal of the in-line power unit, the current detecting list
The third input terminal of member is connected with the second output terminal of the reference signal unit, the output end of the current detecting unit and institute
The input terminal for stating drive element of the grid is connected, the controlled end of the test side of the over-temperature protection unit and the drive element of the grid
It is connected, the output end of the drive element of the grid is connected with the controlled end of the power tube, and the hot end of the power tube is
The inductor incoming end of the filter switching chip, the cold end of the power tube are the interior circuit that the filter switches chip
Ground terminal.
5. filter as claimed in claim 4 switches chip, which is characterized in that the reference signal unit includes：Reference voltage
Unit and reference current unit；
The node that the input terminal of the reference voltage unit is connected with the input terminal of the reference current unit is believed for the benchmark
The input terminal of number unit, the first output end of the reference voltage unit are connected with the output end of the reference current unit, and
The first output end of the reference signal unit is formed, the second output terminal of the reference voltage unit is the reference signal list
The second output terminal of member；
The reference voltage unit is electrically generated third direct current and second reference signal, the base according to first direct current
Quasi- current unit is electrically generated the 4th direct current according to first direct current, and the third direct current is superimposed with the 4th direct current
Form first reference signal.
6. filter as claimed in claim 5 switches chip, which is characterized in that the reference voltage unit includes：First switch
Pipe, second switch pipe, third switching tube, the 4th switching tube, the 5th switching tube, first resistor, second resistance, 3rd resistor and
First amplifier；
The controlled end of the first switch pipe and the controlled end of the second switch pipe are grounded altogether, the height electricity of the first switch pipe
Position end is connected with the controlled end of the first switch pipe, the hot end of the second switch pipe and the second switch pipe by
It controls end to be connected, the cold end of the first switch pipe and the positive input of first amplifier connect the 3rd resistor altogether
First end, the cold end of the second switch pipe is connected with the first end of the first resistor, the of the first resistor
The negative input of two ends and first amplifier connects the first end of the second resistance, the second end of the second resistance altogether
Meet the cold end of the third switching tube, the controlled end of the third switching tube and institute altogether with the second end of the 3rd resistor
The output end for stating the first amplifier is connected, the hot end phase of the third switching tube hot end and the 5th switching tube
Even, the controlled end of the hot end and the 5th switching tube of the 5th switching tube connects the controlled of the 4th switching tube altogether
End, the node that the cold end of the 5th switching tube is connected with the cold end of the 4th switching tube is the reference voltage
The input terminal of unit, the hot end of the 4th switching tube are the first output end of the reference voltage unit.
7. filter as claimed in claim 5 switches chip, which is characterized in that the reference current unit includes：6th switch
Pipe, the 7th switching tube, the 8th switching tube, the 9th switching tube, the tenth switching tube, the 11st switching tube, the 12nd switching tube, the tenth
Three switching tubes, the 14th switching tube, the 15th switching tube, sixteenmo close pipe, the 4th resistance and the 5th resistance；
The first end of the hot end of 6th switching tube, the controlled end of the 6th switching tube and the 4th resistance is total
Ground connection, the cold end of the 6th switching tube are connected with the cold end of the 7th switching tube, the 7th switching tube
Controlled end is connected with the controlled end of the 8th switching tube, and the of the cold end of the 8th switching tube and the 4th resistance
Two ends are connected, and the hot end of the 7th switching tube connects the 9th switching tube altogether with the controlled end of the 7th switching tube
The controlled end of cold end, the 9th switching tube is connected with the controlled end of the tenth switching tube, the tenth switching tube
Cold end is connected with the hot end of the 8th switching tube, controlled end and the 9th switching tube of the 9th switching tube
Hot end connect the hot end of the 11st switching tube, the hot end of the tenth switching tube and the 5th electricity altogether
The first end of resistance connects the controlled end of the 12nd switching tube, second end and the 12nd switching tube of the 5th resistance altogether
Hot end connect the controlled end of the 14th switching tube altogether, the controlled end of the 11st switching tube is opened with the described 12nd
The controlled end for closing pipe connects the controlled end of the 13rd switching tube, the controlled end and the described 14th of the 11st switching tube altogether
The hot end of switching tube is connected, the hot end phase of the cold end and the 15th switching tube of the 12nd switching tube
Even, the cold end of the 13rd switching tube is connected with the hot end of sixteenmo pass pipe, the 13rd switch
The hot end of pipe is the output end of the reference current unit, and the controlled end of the 14th switching tube is opened with the described 15th
The controlled end for closing pipe connects the controlled end that the sixteenmo closes pipe, the cold end and the described tenth of the 14th switching tube altogether
The cold end of five switching tubes connects the sixteenmo and closes the cold end of pipe altogether, and forms input node, the input node
For the input terminal of the reference current unit.
8. filter as claimed in claim 2 switches chip, which is characterized in that the comparing unit includes：Buffer and Shi Mi
Special trigger；
The reference signal input terminal of the Schmidt trigger is connected with the reference signal input terminal of the buffer, described in composition
The reference signal input terminal of comparing unit, the input terminal of the Schmidt trigger is the input terminal of the comparing unit, described
The output end of Schmidt trigger is connected with the input terminal of the buffer, and the output end of the buffer is the comparing unit
Output end.
9. a kind of filter switching circuit of video camera, be set in video camera, and with the filter in power supply and the video camera
Unit is connected, and the filter switching circuit includes：Sampling resistor and photo resistance, which is characterized in that the filter switching circuit
Further include：Filter switches chip, the first inductance, light emitting diode, the first diode and the first capacitance；Wherein, the filter
It is that claim 1 to 8 any one of them filter switches chip to switch chip；
The input electrical signal sampling end of the filter switching chip is connected with the first end of the sampling resistor, the sampling resistor
Second end and the filter switching chip the first end for connecing first diode altogether with electrical input, the one or two pole
The inductor incoming end that the second end of pipe and the filter switch chip is connected, the first end of the light emitting diode and described the
The first end of one capacitance connects the input electrical signal sampling end of filter switching chip altogether, the second end of the light emitting diode with
The second end of first capacitance connects the first end of first inductance altogether, and second end and the filter of first inductance are cut
The inductor incoming end for changing chip is connected, and the filter switching control end of the filter switching chip is connected with the filter unit,
The Enable Pin that the first end of the photo resistance switches chip with the filter is connected, the second end ground connection of the photo resistance；
Wherein, when the intensity of illumination around the photo resistance is less than or equal to predetermined threshold value, the resistance value of the photo resistance
Equal to or more than preset resistive value, and then the enabled terminal potential of the filter switching chip is adjusted, triggers the filter switching chip
Work, and light the light emitting diode so that filter unit carries out filter switching described in the filter switching chip controls.
10. a kind of monitoring device, is connected with background server, which is characterized in that the monitoring device includes such as claim 9 institute
The filter switching circuit for the video camera stated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710210045.5A CN108668052B (en) | 2017-03-31 | 2017-03-31 | Filter switching chip, filter switching circuit of camera and monitoring equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710210045.5A CN108668052B (en) | 2017-03-31 | 2017-03-31 | Filter switching chip, filter switching circuit of camera and monitoring equipment |
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| CN108668052B CN108668052B (en) | 2024-02-13 |
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| CN108668052B (en) | 2024-02-13 |
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Address after: 518000 1701, building 1, Shenzhen new generation industrial park, 136 Zhongkang Road, Meidu community, Meilin street, Futian District, Shenzhen City, Guangdong Province Applicant after: Fuman microelectronics Group Co.,Ltd. Address before: B7-b8, 9th floor, Yanxiang science and technology building, 31 Gaoxin Fourth Road, Nanshan Science and Technology Park, Shenzhen, Guangdong 518000 Applicant before: FINE MADE MICROELECTRONICS GROUP CO.,LTD. |
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