CN206878945U - A kind of filter switching chip, the filter switching circuit and monitoring device of video camera - Google Patents
A kind of filter switching chip, the filter switching circuit and monitoring device of video camera Download PDFInfo
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- CN206878945U CN206878945U CN201720340321.5U CN201720340321U CN206878945U CN 206878945 U CN206878945 U CN 206878945U CN 201720340321 U CN201720340321 U CN 201720340321U CN 206878945 U CN206878945 U CN 206878945U
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Abstract
A kind of filter switching chip, the filter switching circuit and monitoring device of video camera, suitable for electronic technology field.A kind of filter switches 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 direct current of working direct current electricity output first and the second direct current that in-line power unit provides 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 filter unit is controlled to carry out filter switching.So that controlling the circuit of filter switching simpler in monitoring device, production cost is reduced.
Description
Technical field
The utility model belongs to electronic technology field, more particularly to the filter switching of a kind of filter switching chip, video camera
Circuit 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
Crime evidence obtaining can be provided.For example, in order that video camera can remain able to carry out video monitoring or image when light is weaker
Collection, is by increasing filter and its peripheral circuit in the prior art, when light is weaker, then triggers filter, to ensure to image
The picture that machine is collected 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, it is necessary to carry out partial pressures by accessing multiple photo resistance, filter oneself can be realized
Dynamic switching.Therefore, the complicated of filter switching circuit in the prior art be present, required electronic component is more, and cost is too high
The problem of.
Utility model content
The utility model embodiment provides a kind of filter switching chip, the filter switching circuit of video camera and monitoring and set
It is standby, it is intended to solve existing monitoring device and asked in the presence of the production cost caused by the switching circuit of filter is complicated is high
Topic.
The purpose of this utility model is to provide a kind of filter switching chip, with power supply, photo resistance and shooting
Filter unit in machine is connected, and for carrying out filter switching to the filter unit, the filter switching chip includes：Inside supplies
Electric unit, reference signal unit and comparing unit；
The input of the in-line power unit uses electrical input, the in-line power list for filter switching chip
The input of member is connected with the power supply output end, the first output end and the reference signal of the in-line power unit
The input of unit is connected, the second output end of the in-line power unit and the reference signal input phase of the comparing unit
Even, the first output end of the reference signal unit is connected with the input of the comparing unit, the input of the comparing unit
The Enable Pin for switching chip for the filter is held, the input of the comparing unit is connected with the first end of the photo resistance,
The second end ground connection of the photo resistance, the output end of the comparing unit switch the filter switching control of chip for the filter
End, the output end of the comparing unit are connected with the controlled end of the filter unit；
The direct current of working direct current electricity output first and second that the in-line power unit provides 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 into the comparing unit so that the comparing unit according to
The reference signal and luminance signal generation switching signal, and then control the filter unit to carry out filter switching.
Another object of the present utility model is the filter switching circuit for providing a kind of video camera, in video camera, and
It is connected with the filter unit in power supply and the video camera, the filter switching circuit includes：Sampling resistor and photosensitive electricity
Resistance, the filter switching circuit also include：Filter switching chip, the first inductance, light emitting diode, the first diode and first
Electric capacity；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
Second end of resistance and the first end for connecing first diode altogether with electrical input of filter switching chip, described first
Second end of diode is connected with the interior circuit ground end of filter switching chip, the first end of the light emitting diode and institute
The first end for stating the first electric capacity connects the input electrical signal sampling end of filter switching chip altogether, and the second of the light emitting diode
End and the second end of first electric capacity connect the first end of first inductance, the second end and the filter of first inductance altogether
The inductor incoming end of mirror switching 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 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 cut
Change.
Another object of the present utility model is to provide a kind of monitoring device, is connected with background server that the monitoring is set
The standby filter switching circuit for including video camera as described above.
Filter in a kind of filter switching chip, with power supply, photo resistance and video camera provided by the utility model
Mirror unit 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 direct current of working direct current electricity output first and second that in-line power unit provides according to power supply
Direct current, reference signal unit are electrically generated the first reference signal, ginseng of second direct current as comparing unit according to the first direct current
Examine signal；When intensity of illumination around photo resistance is less than or equal to predetermined threshold value, photo resistance generates according to intensity of illumination
Luminance signal, and luminance signal is sent to comparing unit so that comparing unit is cut according to reference signal and luminance signal generation
Signal is changed, and then controls filter unit to carry out filter switching.So that control the circuit of filter switching simpler in monitoring device, drop
Low production cost.
Brief description of the drawings
Fig. 1 is a kind of structural representation for filter switching chip that the utility model embodiment provides；
Fig. 2 is a kind of concrete structure schematic diagram for filter switching chip that the utility model embodiment provides；
Fig. 3 is the physical circuit of reference voltage unit in a kind of filter switching chip that the utility model embodiment provides
Figure；
Fig. 4 is the physical circuit of reference current unit in a kind of filter switching chip that the utility model embodiment provides
Figure；
Fig. 5 is the physical circuit figure of comparing unit in a kind of filter switching chip that the utility model embodiment provides；
Fig. 6 is a kind of structural representation of the filter switching circuit for video camera that the utility model embodiment provides；
Fig. 7 is a kind of structural representation for monitoring device that the utility model embodiment provides.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.
The utility model embodiment provides a kind of filter switching chip, the filter switching circuit of video camera and monitoring and set
It is standby, it is intended to solve existing monitoring device and asked in the presence of the production cost caused by the switching circuit of filter is complicated is high
Topic.
Realization of the present utility model is described in detail below in conjunction with specific embodiment：
Fig. 1 shows a kind of structure of filter switching chip of the utility model embodiment, for convenience of description, illustrate only
The part related to the utility model embodiment.
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 input of in-line power unit 10 uses electrical input for filter switching chip 100, in-line power unit 10
Input VIN is connected with the output end of power supply 110, the first output end and the reference signal unit 20 of in-line power unit 10
Input is connected, and the second output end of in-line power unit 10 is connected with the reference signal input of comparing unit 30, benchmark letter
First output end of number unit 20 is connected with the input of comparing unit 30, and the input of comparing unit 30 switches core for filter
The Enable Pin EN of piece 100, the input of comparing unit 30 are connected with photo resistance RE first end, photo resistance RE the second end
Ground connection, the output end of comparing unit 30 switch the filter switching control end IRC of chip 100, the output end of comparing unit for filter
It is connected with the controlled end of filter unit.
The direct current of working direct current electricity output first and the second direct current that in-line power unit 10 provides 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 generation switching signal, and then control filter unit 120 to carry out filter switching.
It should be noted that the working direct current electricity that in-line power unit 10 is provided power supply 110 carries out voltage conversion,
And then the first direct current VDD is exported to reference signal unit 20, the second direct current is exported as reference signal to comparing unit 30
VREF。
It is understood that the input 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 also includes：Current detecting unit 40, drive element of the grid 50, excess temperature are protected
Protect unit 60 and power tube 70.
The first input end of current detecting unit 40 is the input electrical signal sampling end ISE that filter switches chip 100, is used
Sampled in the working direct current electricity provided power supply 110, to obtain input electrical signal.
Second input of current detecting unit 40 is connected with the input of in-line power unit 10, current detecting unit 40
The 3rd input be connected with the second output end of reference signal unit 20, the output end of current detecting unit 40 is driven with grid
The input of moving cell 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, grid
The output end of driver element 50 is connected with the controlled end of power tube 70, and the hot end of power tube 70 switches chip 100 for filter
Inductor incoming end LX, the cold end of power tube switches the interior circuit ground end PGND of chip 100 for filter.
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
The working direct current electricity that power supply 110 provides is sampled, and to obtain input electrical signal, current detecting unit 40 is according to input electrical signal
Driving control signal is generated with the second reference signal, and driving control signal is sent to drive element of the grid 50, to drive work(
Rate pipe 70.
Preset when over-temperature protection unit 60 detects that the temperature that drive element of the grid 50 works according to input electrical signal is more than
During temperature threshold, the control gate driver element 50 of over-temperature protection unit 60 is stopped.
It should be noted that because 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 the warm control gate of protection location 60 is driven
When moving cell 50 is stopped, corresponding power tube 70 ends, so cause filter switching chip 100 be stopped, cause with
External circuit open circuit connected the inductor incoming end LX of filter switching chip 100, or cause and filter switching chip 100
The connected external circuit open circuits of interior circuit ground end PGND.
Fig. 2 shows a kind of concrete structure of filter switching chip of the utility model embodiment, for convenience of description, only shows
The part related to the utility model embodiment is gone out.
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 of reference voltage unit 21 is connected with the input of reference current unit 22
The input 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 end of reference voltage unit 21
End.
Reference voltage unit 21 is electrically generated the 3rd 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 the 3rd 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 the 3rd direct current, the 3rd 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 by the 3rd direct current with the 4th direct current and forms the first benchmark letter
Number it is zero-temperature coefficient direct current.
Raise and raise with temperature it should be noted that positive temperature coefficient direct current is size of current, negative temperature coefficient is straight
Stream electricity 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 utility model embodiment, such as
Shown in Fig. 3, reference voltage unit 21 includes：First switch pipe Q1, second switch pipe Q2, the 3rd switching tube Q3, the 4th switching tube
Q4, the 5th 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 controlled end and second switch pipe Q2 is grounded altogether, first switch pipe Q1 high potential
End is connected with first switch pipe Q1 controlled end, the controlled end phase of second switch pipe Q2 hot end and second switch pipe Q2
Even, first switch pipe Q1 cold end and the first amplifier T1 positive input connect 3rd resistor R3 first end altogether, the
Two switching tube Q2 cold end is connected with first resistor R1 first end, first resistor R1 the second end and the first amplifier
T1 negative input connects second resistance R2 first end altogether, and second resistance R2 the second end is total to 3rd resistor R3 the second end
The 3rd switching tube Q3 cold end is connect, the 3rd switching tube Q3 controlled end is connected with the first amplifier T1 output end, and the 3rd
Switching tube Q3 hot ends are connected with the 5th switching tube Q5 hot end, and the 5th switching tube Q5 hot end is opened with the 5th
The controlled end for closing pipe Q5 connects the 4th switching tube Q4 controlled end altogether, the 5th switching tube Q5 cold end and the 4th switching tube Q4's
The input of voltage cell 21 on the basis of the connected node of cold end, voltage on the basis of the 4th switching tube Q4 hot end
First output end of unit 21.
As a kind of possible implementation of the utility model, first switch pipe Q1 and second switch pipe Q2 is respectively PNP
Type triode Q1 and PNP type triode Q2.Wherein, the PNP type triode Q1 extremely described first switch pipe Q1 of transmitting low electricity
Position end, the extremely described first switch pipe Q1 of PNP type triode Q1 current collections hot end, PNP type triode Q1 base stages are described
First switch pipe Q1 controlled end.
It should be noted that first switch pipe Q1 and second switch pipe Q2 are the triode that emitter area is different, both
Between the difference of tube voltage drop raised with the rise of temperature, because the first amplifier T1 clamping action causes first switch pipe Q1
Tube voltage drop and second resistance R102 of the tube voltage drop equal to second switch pipe Q2 pressure drop sum.So that on first resistor R101
Flow through the electric current of positive temperature coefficient, then the electricity being made up of the 3rd switching tube Q3, the 4th switching tube Q4 and the 5th switching tube Q5
Flow the output of mirror mirror image.
Fig. 4 shows the physical circuit of reference current unit in a kind of filter switching chip of the utility model embodiment, such as
Shown in Fig. 4, reference current unit 22 includes：6th switching tube Q6, the 7th switching tube Q7, the 8th switching tube Q8, the 9th switching tube
Q9, the tenth switching tube Q10, 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, sixteenmo close pipe Q16, the 4th resistance R4 and the 5th resistance R5.
6th switching tube Q6 hot end, the 6th switching tube Q6 controlled end and the 4th resistance R4 first end connects altogether
Ground, the 6th switching tube Q6 cold end are connected with the 7th switching tube Q7 cold end, the 7th switching tube Q7 controlled end with
8th switching tube Q8 controlled end is connected, and the 8th switching tube Q8 cold end is connected with the 4th resistance R4 the second end, and the 7th
Switching tube Q7 hot end and the 7th switching tube Q7 controlled end connect the 9th switching tube Q9 cold end, the 9th switch altogether
Pipe Q9 controlled end is connected with the tenth switching tube Q10 controlled end, the tenth switching tube Q10 cold end and the 8th switching tube Q8
Hot end be connected, the 9th switching tube Q9 controlled end and the 9th switching tube Q9 hot end connect the 11st switching tube altogether
Q11 hot end, the tenth switching tube Q10 hot end and the 5th resistance R5 first end meet the 12nd switching tube Q12 altogether
Controlled end, the 5th resistance R5 the second end and the 12nd switching tube Q12 hot end connect the 14th switching tube Q14's altogether
Controlled end, the 11st switching tube Q11 controlled end and the 12nd switching tube Q12 controlled end connect the 13rd switching tube Q13's altogether
Controlled end, the 11st switching tube Q11 controlled end are connected with the 14th switching tube Q14 hot end, the 12nd switching tube
Q12 cold end is connected with the 15th switching tube Q15 hot end, the 13rd switching tube Q13 cold end and the tenth
Six switching tube Q16 hot end is connected, the output end of current unit on the basis of the 13rd switching tube Q13 hot end, the
14 switching tube Q14 controlled end and the 15th switching tube Q15 controlled end connect the controlled end that sixteenmo closes pipe Q16 altogether, the
14 switching tube Q14 cold end and the 15th switching tube Q15 cold end connect the low potential that sixteenmo closes pipe Q16 altogether
End, and input node is formed, the input of current unit 22 on the basis of input node.
As a kind of possible implementation of the utility model, the 6th switching tube Q6 is PNP type triode Q6, positive-negative-positive three
The pole pipe Q6 extremely described 6th switching tube Q6 of transmitting cold end, extremely described 6th switch of PNP type triode Q6 current collections
Pipe Q6 hot end, PNP type triode Q6 base stages are the controlled end of the 6th switching tube Q6.
It should be noted that the voltage between PNP type triode Q6 emitter stage and base stage reduces with the rise of temperature,
Due to the clamping action of current mirror cause the emitter stage of the pressure drop of the 4th resistance R4 equal to PNP type triode Q6 and base stage it
Between voltage so that negative temperature electric current is flowed through on the 4th resistance R4, and passes 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 utility model embodiment, such as Fig. 4 institutes
Show, comparing unit 30 includes：Buffer D1 and Schmidt trigger D2.
Schmidt trigger D3 reference signal input is connected with buffer D1 reference signal input, ratio of components compared with
The reference signal input of unit 30, Schmidt trigger D2 input are the input of comparing unit 30, schmidt trigger
Device D2 output end is connected with buffer D1 input, and buffer D1 output end is the output end of comparing unit 30.
It is understood that the embodiment due to a kind of filter switching chip 100 provided in the present embodiment
Elaborated in the above-described embodiments with operation principle, therefore, here is omitted.
The purpose of this utility model also resides in the filter switching circuit 200 for providing a kind of video camera, as shown in fig. 6, shooting
The filter switching circuit 200 of machine is located in video camera, and is connected with the filter unit 120 in power supply 110 and video camera, is filtered
Mirror switching circuit 200 includes：Sampling resistor RS and photo resistance RE, filter switching circuit 200 also include：Filter switches chip
U1, the first inductance L1, LED, the first diode D1 and the first electric capacity C1.Wherein, filter switching chip U1 is
Filter switching chip 100 in above-described embodiment.
Filter switching chip U1 input electrical signal sampling end ISE is connected with sampling resistor RS first end, sampling resistor
RS the second end and the filter switching chip U1 first end for meeting the first diode D1 altogether with electrical input VIN, the first diode
D1 the second end is connected with filter switching chip U1 inductor incoming end LX, the first end of LED and the first electricity
The first end for holding C1 meets filter switching chip U1 input electrical signal sampling end ISE altogether, the second end of LED with
First electric capacity C1 the second end connects the first inductance L1 first end altogether, and the first inductance L1 the second end is with filter switching chip U1's
Inductor incoming end LX is connected, and filter switching chip U1 filter switching control end IRC is connected with filter unit 120, photosensitive electricity
The first end for hindering RE is connected with filter switching chip U1 Enable Pin EN, photo resistance RE the second end ground connection.
Wherein, when the intensity of illumination around photo resistance RE is less than or equal to predetermined threshold value, photo resistance RE resistance
Equal to or more than preset resistive value, and then filter switching chip U1 Enable Pin EN current potentials are adjusted, triggering filter switching chip U1 works
Make, and light LED so that filter switching chip U1 control filters unit 120 carries out filter switching.
Another object of the present utility model is to provide a kind of monitoring device, as shown in fig. 7, a kind of monitoring device 300, with
Background server 210 is connected, and monitoring device 300 includes：Power supply 110 and filter unit 120, monitoring device 300 also include
The filter switching circuit 200 of video camera in above-described embodiment.
Due to a kind of monitoring device provided in the present embodiment embodiment and work relevant with the utility model
Make principle to have elaborated in the above-described embodiments, therefore, here is omitted.
Filter in a kind of filter switching chip, with power supply, photo resistance and video camera provided by the utility model
Mirror unit 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 direct current of working direct current electricity output first and second that in-line power unit provides according to power supply
Direct current, reference signal unit are electrically generated the first reference signal, ginseng of second direct current as comparing unit according to the first direct current
Examine signal；When intensity of illumination around photo resistance is less than or equal to predetermined threshold value, photo resistance generates according to intensity of illumination
Luminance signal, and luminance signal is sent to comparing unit so that comparing unit is cut according to reference signal and luminance signal generation
Signal is changed, and then controls filter unit to carry out filter switching.So that control the circuit of filter switching simpler in monitoring device, drop
Low production cost.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (8)
1. a kind of filter switches chip, it is connected with the filter unit in power supply, photo resistance and video camera, for institute
State filter unit and carry out filter switching, it is characterised in that the filter switching chip includes：In-line power unit, reference signal
Unit and comparing unit；
The input of the in-line power unit uses electrical input for filter switching chip, the in-line power unit
Input is connected with the power supply output end, the first output end and the reference signal unit of the in-line power unit
Input be connected, the second output end of the in-line power unit is connected with the reference signal input of the comparing unit,
First output end of the reference signal unit is connected with the input of the comparing unit, and the input of the comparing unit is
The Enable Pin of the filter switching chip, the input of the comparing unit is connected with the first end of the photo resistance, described
The second end ground connection of photo resistance, the output end of the comparing unit switch the filter switching control end of chip for the filter,
The output end of the comparing unit is connected with the controlled end of the filter unit；
The direct current of working direct current electricity output first and the second direct current that the in-line power unit provides 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 into the comparing unit so that the comparing unit is according to
Reference signal and luminance signal generation switching signal, and then control the filter unit to carry out filter switching.
2. filter as claimed in claim 1 switches chip, it is characterised in that the filter switching chip also includes：Electric current is examined
Survey unit, drive element of the grid, over-temperature protection unit and power tube；
The first input end of the current detecting unit is the input electrical signal sampling end that the filter switches chip, for institute
The working direct current electricity for stating power supply offer is sampled, to obtain the input electrical signal；
Second input of the current detecting unit is connected with the input of the in-line power unit, the current detecting list
3rd input of member is connected with the second output end of the reference signal unit, the output end of the current detecting unit and institute
The input for stating drive element of the grid is connected, the test side of the over-temperature protection unit and the controlled end of 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 switch the interior circuit of chip for the filter
Ground terminal；
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 and second reference signal generation driving control signal, and the driving control signal is sent to the grid
Pole driver element, to drive the power tube；
When the over-temperature protection unit detects that the temperature that the drive element of the grid works according to the input electrical signal is more than
During preset temperature threshold value, the over-temperature protection unit controls the drive element of the grid to be stopped.
3. filter as claimed in claim 2 switches chip, it is characterised in that the reference signal unit includes：Reference voltage
Unit and reference current unit；
The node that the input of the reference voltage unit is connected with the input of the reference current unit is believed for the benchmark
The input 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 end of the reference voltage unit is the reference signal list
Second output end of member；
The reference voltage unit is electrically generated the 3rd 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 3rd direct current is superimposed with the 4th direct current
Form first reference signal.
4. filter as claimed in claim 3 switches chip, it is characterised in that the reference voltage unit includes：First switch
Pipe, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube, first resistor, second resistance, 3rd resistor and
First amplifier；
The controlled end of the controlled end of the first switch pipe and the second switch pipe is 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
Control end is connected, and the positive input of the cold end of the first switch pipe and first amplifier connects 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 3rd switching tube, the controlled end of the 3rd 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 3rd 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 of unit, the hot end of the 4th switching tube are the first output end of the reference voltage unit.
5. filter as claimed in claim 3 switches chip, it is characterised 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；
Hot end, the controlled end of the 6th switching tube and the first end of the 4th resistance of 6th switching tube are total to
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
Cold end, the controlled end of the 9th switching tube are 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 described 5th electricity altogether
The first end of resistance connects the controlled end of the 12nd switching tube, the 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 of the reference current unit.
6. filter as claimed in claim 1 switches chip, it is characterised in that the comparing unit includes：Buffer and Shi Mi
Special trigger；
The reference signal input of the Schmidt trigger is connected with the reference signal input of the buffer, described in composition
The reference signal input of comparing unit, the input of the Schmidt trigger is the input of the comparing unit, described
The output end of Schmidt trigger is connected with the input of the buffer, and the output end of the buffer is the comparing unit
Output end.
7. a kind of filter switching circuit of video camera, 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, it is characterised in that the filter switching circuit
Also include：Filter switching chip, the first inductance, light emitting diode, the first diode and the first electric capacity；Wherein, the filter
It is that the filter described in any one of claim 1 to 6 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
The 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 of second end of pipe and the filter switching chip is connected, the first end of the light emitting diode and described the
The first end of one electric capacity connects the input electrical signal sampling end of filter switching chip altogether, the second end of the light emitting diode with
Second end of first electric capacity connects the first end of first inductance altogether, and the 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 first end of the photo resistance is connected with the Enable Pin of filter switching chip, 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 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, trigger the filter switching chip
Work, and light the light emitting diode so that filter unit described in the filter switching chip controls carries out filter switching.
8. a kind of monitoring device, is connected with background server, it is characterised in that the monitoring device is included such as claim 7 institute
The filter switching circuit for the video camera stated.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720340321.5U CN206878945U (en) | 2017-03-31 | 2017-03-31 | A kind of filter switching chip, the filter switching circuit and monitoring device of video camera |
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| CN201720340321.5U CN206878945U (en) | 2017-03-31 | 2017-03-31 | A kind of filter switching chip, the filter switching circuit and monitoring device of video camera |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108668052A (en) * | 2017-03-31 | 2018-10-16 | 深圳市富满电子集团股份有限公司 | A kind of filter switches the filter switching circuit and monitoring device of chip, video camera |
-
2017
- 2017-03-31 CN CN201720340321.5U patent/CN206878945U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108668052A (en) * | 2017-03-31 | 2018-10-16 | 深圳市富满电子集团股份有限公司 | A kind of filter switches the filter switching circuit and monitoring device of chip, video camera |
| CN108668052B (en) * | 2017-03-31 | 2024-02-13 | 富满微电子集团股份有限公司 | Filter switching chip, filter switching circuit of camera and monitoring equipment |
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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 Patentee 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 Patentee before: SHENZHEN FUMAN ELECTRONIC GROUP Co.,Ltd. |