CN109040659A - Video conferencing system with circuit protection function - Google Patents
Video conferencing system with circuit protection function Download PDFInfo
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- CN109040659A CN109040659A CN201811174900.2A CN201811174900A CN109040659A CN 109040659 A CN109040659 A CN 109040659A CN 201811174900 A CN201811174900 A CN 201811174900A CN 109040659 A CN109040659 A CN 109040659A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/15—Conference systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
Abstract
The invention discloses a kind of video conferencing systems with circuit protection function; including audio-video processing unit, wireless microphone, wire microphone, camera, display terminal, local computer, remote computer, power supply module and mobile terminal, audio-video processing unit includes wireless communication module, audio processing modules, video processing module, Wireless microphone receiver, wire microphone socket and speaker；Power supply module includes transformer, bridge rectifier, first capacitor, first resistor, the second capacitor, the first triode, third capacitor, first diode, the second triode, the 5th capacitor, second resistance, third transistor, the second diode, third diode, the 4th triode, 3rd resistor, the 4th resistance, the 5th resistance, the 5th triode, the 4th diode, the 4th capacitor and voltage output end.Circuit structure of the present invention is relatively simple, cost is relatively low, maintain easily, the safety and reliability of circuit is higher.
Description
Technical field
The present invention relates to video conference field, in particular to a kind of video conferencing system with circuit protection function.
Background technique
Video conferencing system, also known as TV conference system, this refers to the individual or group of two or more different places
Body, by sound, image and document data mutual transmission, realizes the communication immediately and interacted by transmission line and multimedia equipment, with
Realize the system equipment of teleconference.The use of video conference is somewhat like phone, in addition to that can see the people to converse with you and progress
Outside communication, moreover it is possible to which the expression and movement for seeing them make the people in different places just as linking up in same meeting room.
The component that the power pack of traditional video conference system uses is more, and circuit structure is complicated, and hardware cost is higher, it has not been convenient to tie up
Shield.In addition, since the power pack of traditional video conference system lacks corresponding circuit protection function, such as: anti-stop signal is dry
Function is disturbed, causes the safety and reliability of circuit poor.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the above drawbacks of the prior art, provide a kind of circuit structure compared with
For simple, cost is relatively low, maintains easily, the higher video conference with circuit protection function of the safety and reliability of circuit
System.
The technical solution adopted by the present invention to solve the technical problems is: constructing a kind of video with circuit protection function
Conference system, including audio-video processing unit, wireless microphone, wire microphone, camera, display terminal, local computer,
Remote computer, power supply module and mobile terminal, the audio-video processing unit include wireless communication module, audio processing mould
Block, video processing module, Wireless microphone receiver, wire microphone socket and speaker, the wireless communication module with it is described
Mobile terminal connection, the wireless communication module are equipped with speech output end and voice input terminal, and the audio processing modules are equipped with
First audio input end, the second audio input end, third audio input end, the first audio output, the second audio output and
Third audio output, the speech output end are connect with first audio input end, first audio output and institute
The connection of predicate sound input terminal, second audio input end are connect with the Wireless microphone receiver, the wire microphone
It being connect with the wire microphone socket, the wire microphone socket is also connect with second audio input end, and described
Two audio outputs are connect with the speaker, the third audio input end and the third audio output with the local
Computer connection, the Wireless microphone receiver are wirelessly connect with the wireless microphone, the video processing
Module is equipped with video input interface and video output interface, and the video input interface is connect with the camera, the video
Output interface is connect with the local computer, and the display terminal is connect with the local computer, the local computer
It is connect by network with the remote computer, the power supply module is connect with the audio-video processing unit；
The power supply module includes transformer, bridge rectifier, first capacitor, first resistor, the second capacitor, the one or three pole
Pipe, third capacitor, first diode, the second triode, the 5th capacitor, second resistance, third transistor, the second diode,
Three diodes, the 4th triode, 3rd resistor, the 4th resistance, the 5th resistance, the 5th triode, the 4th diode, the 4th capacitor
And voltage output end, one end of one end connection 220V alternating current of the primary coil of the transformer, the primary of the transformer
The other end of coil is connect with the other end of the 220V alternating current, one end of the secondary coil of the transformer and the bridge-type
One input terminal of rectifier connects, and another input terminal of the bridge rectifier is another with the secondary coil of the transformer
One end connection, an output end of the bridge rectifier respectively with the anode of the first capacitor, first resistor one end and
The collector of first triode connects, and the other end of the first resistor is connect with the anode of second capacitor, and described first
The cathode of the cathode of capacitor and the second capacitor is connect with the another output of the bridge rectifier, first triode
The anode of base stage and the third capacitor connect, the cathode of the third capacitor respectively with the base stage of second triode and
The cathode of first diode connects, the emitter of the anode of the first diode and the second triode with second capacitor
Cathode connection, the collector of second triode connect by the 5th capacitor with the base stage of the third transistor；
The emitter of first triode respectively with one end of the second resistance, the cathode of third diode, the 5th
The base stage of triode is connected with one end of voltage output end, the current collection of the other end of the second resistance and the third transistor
Pole connection, the anode of the third diode are connect with the emitter of the 4th triode, the transmitting of the third transistor
Pole is connect with the cathode of second diode, the collector of the 4th triode and one end of 3rd resistor respectively, and described second
The anode of diode is connect with the other end of the emitter of second triode and 3rd resistor respectively, the 5th triode
Emitter connect with one end of the 4th resistance, the other end of the 4th resistance base with the 4th triode respectively
Pole, the 5th resistance one end connected with the anode of the 4th diode, the collector of the 5th triode is respectively with the described 4th
The anode connection of the cathode of diode and the 4th capacitor, the other end of the 5th resistance cathode with the 4th capacitor respectively
It is connected with the other end of voltage output end, the capacitance of the 5th capacitor is 350pF.
In the video conferencing system of the present invention with circuit protection function, the power supply module further includes the 6th
One end of resistance, the 6th resistance is connect with the cathode of the third diode, the other end of the 6th resistance with it is described
The base stage of 5th triode connects, and the resistance value of the 6th resistance is 36k Ω.
In the video conferencing system of the present invention with circuit protection function, the power supply module further includes the 7th
One end of resistance, the 7th resistance is connect with one end of the first resistor, the other end of the 7th resistance and described the
The collector of one triode connects, and the resistance value of the 7th resistance is 45k Ω.
In the video conferencing system of the present invention with circuit protection function, the power supply module further includes the 5th
The anode of diode, the 5th diode is connect with the emitter of first triode, the cathode of the 5th diode
It is connect with one end of the second resistance, the model L-2733 of the 5th diode.
In the video conferencing system of the present invention with circuit protection function, first triode and the two or three
Pole pipe is NPN type triode.
In the video conferencing system of the present invention with circuit protection function, the third transistor, the four or three
Pole pipe and the 5th triode are NPN type triode.
In the video conferencing system of the present invention with circuit protection function, the wireless communication module is bluetooth
Module, WIFI module, gsm module, GPRS module, CDMA module, CDMA2000 module, WCDMA module, TD-SCDMA module,
Zigbee module or LoRa module.
Implement the video conferencing system with circuit protection function of the invention, has the advantages that due to being equipped with
Audio-video processing unit, wireless microphone, wire microphone, camera, display terminal, local computer, remote computer, confession
Electric module and mobile terminal；Power supply module includes transformer, bridge rectifier, first capacitor, first resistor, the second capacitor,
One triode, third capacitor, first diode, the second triode, the 5th capacitor, second resistance, third transistor, the two or two pole
Pipe, third diode, the 4th triode, 3rd resistor, the 4th resistance, the 5th resistance, the 5th triode, the 4th diode,
Four capacitors and voltage output end, power pack of the power supply module relative to traditional video conference system, the component used
It is less, due to saving some components, hardware cost can be reduced in this way, in addition, the 5th capacitor is for preventing the two or three pole
Interference between pipe and third transistor, therefore circuit structure is relatively simple, cost is relatively low, maintains easily, the safety of circuit
It is higher with reliability.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the present invention with the structural schematic diagram in video conferencing system one embodiment of circuit protection function；
Fig. 2 is the circuit diagram of power supply module in the embodiment.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In the video conferencing system embodiment that the present invention has circuit protection function, this has the view of circuit protection function
The structural schematic diagram of frequency conference system is as shown in Figure 1.In Fig. 1, it includes sound that this, which has the video conferencing system of circuit protection function,
Video process apparatus 1, wireless microphone 2, wire microphone 3, camera 4, display terminal 5, local computer 6, remote computation
Machine 7, power supply module 8 and mobile terminal 9, wherein audio-video processing unit 1 includes wireless communication module 11, audio processing modules
12, video processing module 13, Wireless microphone receiver 14, wire microphone socket 15 and speaker 16, wireless communication module 11
It is connect with mobile terminal 9, wireless communication module 11 is equipped with speech output end SPK and voice input terminal MIC, audio processing modules 12
Equipped with the first audio input end IN1, the second audio input end IN2, third audio input end IN3, the first audio output OUT1,
Second audio output OUT2 and third audio output OUT3, the first audio input end IN1 for inputting videoconference signal,
Second audio input end IN2 comes from local computer 6 for inputting for inputting microphone signal, third audio input end IN3
Web conference signal, the first audio output OUT1 is for exporting voice signal to wireless communication module 11, the second audio
Output end OUT2 is used to export voice signal to speaker 16, and third audio output OUT3 is used to export to local computer 6
Voice signal.
Specifically, speech output end SPK is connect with the first audio input end IN1, the first audio output OUT1 and language
The MIC connection of sound input terminal, the second audio input end IN2 are connect with Wireless microphone receiver 14, wire microphone 3 and wired wheat
Gram wind socket 15 connects, and wire microphone socket 15 also connect with the second audio input end IN2, the second audio output OUT2 and
Speaker 16 connects, and third audio input end IN3 is connect with local computer 6 with third audio output OUT3, wireless Mike
Wind receiver 14 is wirelessly connect with wireless microphone 2.
Video processing module 13 is equipped with video input interface V-in and video output interface V-out, video input interface V-
In is connect with camera 4, and video output interface V-out is connect with local computer 6, and display terminal 5 and local computer 6 connect
It connects, local computer 6 is connect by network with remote computer 7, and power supply module 8 is connect with audio processing modules 12.
Module 11 actively can establish telecommunication with mobile terminal 9 to user by wireless communication, this has circuit protection
Mode realizes remote phone meeting to the video conferencing system of function by wireless communication, is not limited by route, use is more square
Just.
In the present embodiment, wireless communication module 11 is bluetooth module, WIFI module, gsm module, GPRS module, CDMA mould
Block, CDMA2000 module, WCDMA module, TD-SCDMA module, Zigbee module or LoRa module etc..By the way that a variety of nothings are arranged
Line communication mode can not only increase the flexibility of communication, moreover it is possible to meet the needs of different user and different occasions.
When in particular by LoRa module, farther out, and communication performance is relatively stable for communication distance, be suitable for QoS requirement compared with
High occasion.
In specific application, multiple wireless microphones 2 and multiple wire microphones 3 can be configured in local meeting-place, with
It says and uses for more human hairs in local meeting-place.Furthermore, it is also possible to multiple cameras 4 be configured in local meeting-place, for absorbing this
Scene in ground meeting-place.
When carrying out multi-party call meeting, this has the working principle of the video conferencing system of circuit protection function as follows:
Wireless communication module 11 by wireless communication establish telecommunication with mobile terminal 9 and connect by network, speech output end SPK and first
Remote phone conference signal, can be transferred to audio processing modules 12 by audio input end IN1 connection.
Personnel in local meeting-place can be made a speech by microphone, and audio-video processing unit 1 passes through built-in wireless Mike
Wind receiver 14 and wire microphone socket 15 receive the microphone signal in local meeting-place；Wherein, Wireless microphone receiver
14 receive the voice signal of 2 typing of wireless microphone in local meeting-place, and wire microphone socket 15 receives in local meeting-place
The voice signal of 3 typing of wire microphone, above-mentioned microphone voice signal are transferred to the second audio input IN2；Second sound
Frequency output end OUT2 is connected to speaker 16.
Local computer 6 in local meeting-place can access internet, and be led to by internet with remote computer 7
Letter, such as hold Web conference, video communication etc..The audio output port and third audio input end IN3 of local computer 6 connect
It is logical, to receive Web conference signal from local computer 6；And the audio of third audio output OUT3 and local computer 6
Input port connection, by audio signal transmission to local computer 6.
Audio-video processing unit 1 by built-in audio processing modules 12 handle videoconference signal, microphone signal and
Web conference signal, the first audio signal that microphone signal and Web conference signal are synthesized, by videoconference signal, Mike
Second audio signal of wind number and the synthesis of Web conference signal mixes the third that videoconference signal and microphone signal synthesize
Sound signal.Finally, the first audio signal is transferred to wireless communication module 11 by the first audio output OUT1, and then transmit
To mobile terminal 9, the second audio signal is transferred to by speaker 16 by the second audio output OUT2, thus in local meeting-place
Videoconference voice is played, third audio signal is transferred to by local computer 6, Jin Erchuan by third audio output OUT3
It is defeated to arrive remote computer 7, multi-party call meeting is realized with this.
Video processing module 13 in audio-video processing unit 1 is also used to handle vision signal, passes through video input interface
V-in receives the meeting live video that camera 4 absorbs, and after integrating to video, is transmitted by video output interface V-out
To local computer 6, is exported by local computer 6 and played out to display terminal 5.Alternatively, being transmitted to by local computer 6
Remote computer 7 makes long-range people with a part in a conference person by understanding conference scenario.In addition, can also pass through on local meeting-place
Local computer 6 receives the video of remote computer 7, and plays on the display terminal 5 in local meeting-place.
The video conferencing system with circuit protection function can access the wireless microphone signals at scene and carry out audio
Processing is realized so that the personnel that wireless microphone 2 is made a speech that pass through on current meeting-place may be added in remote phone meeting
Multi-party call.The video conferencing system with circuit protection function can also further access computer, to receive telenet
The voice signal of network meeting, so that the personnel for holding Web conference on computers can also be added in remote phone meeting,
It can effectively realize that meeting scene and the fusion call of remote audio, video make to expand the use crowd of remote phone meeting
The participant of remote phone meeting is not limited only to telephone subscriber, and easy to operate.
Fig. 2 is the circuit diagram of power supply module in the present embodiment, and in Fig. 2, which includes transformer T, bridge-type
Rectifier Z, first capacitor C1, first resistor R1, the second capacitor C2, the first triode Q1, third capacitor C3, first diode
D1, the second triode Q2, the 5th capacitor C5, second resistance R2, third transistor Q3, the second diode D2, third diode D3,
4th triode Q4,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 5th triode Q5, the 4th diode D4, the 4th
Capacitor C4 and voltage output end Vo, wherein one end of one end connection 220V alternating current of the primary coil of transformer T, transformer T
The other end of primary coil connect with the other end of 220V alternating current, one end of the secondary coil of transformer T and bridge rectifier
An input terminal of device Z connects, and another input terminal of bridge rectifier Z is connect with the other end of the secondary coil of transformer T,
An output end of bridge rectifier Z respectively with the anode of first capacitor C1, one end of first resistor R1 and the first triode Q1
Collector connection, the positive of the other end of first resistor R1 and the second capacitor C2 connect, the cathode of first capacitor C1 and second
The cathode of capacitor C2 is connect with the another output of bridge rectifier Z, the base stage and third capacitor C3 of the first triode Q1
Anode connection, the cathode of third capacitor C3 connect with the cathode of the base stage of the second triode Q2 and first diode D1 respectively,
The emitter of the anode of first diode D1 and the second triode Q2 are connect with the cathode of the second capacitor C2, the second triode Q2
Collector connect with the base stage of third transistor Q3 by the 5th capacitor C5.
The emitter of first triode Q1 respectively with one end of second resistance R2, the cathode of third diode D3, the five or three
The base stage of pole pipe Q5 is connected with one end of voltage output end Vo, the other end of second resistance R2 and the collector of third transistor Q3
Connection, the anode of third diode D3 connect with the emitter of the 4th triode Q4, the Q3 emitter of third transistor respectively with
The cathode of second diode D2, the collector of the 4th triode Q4 are connected with one end of 3rd resistor R3, the second diode D2's
Anode is connect with the other end of the emitter of the second triode Q2 and 3rd resistor R3 respectively, the emitter of the 5th triode Q5 with
One end of 4th resistance R4 connects, the other end of the 4th resistance R4 respectively with the base stage of the 4th triode Q4, the 5th resistance R5
One end is connected with the anode of the 4th diode D4, the collector of the 5th triode Q5 respectively with the cathode of the 4th diode D4 and
The anode connection of four capacitor C4, the other end of the 5th resistance R5 are another with the cathode of the 4th capacitor C4 and voltage output end Vo respectively
One end connection.
The power pack of the power supply module 8 relative to traditional video conference system, the component used is less, circuit knot
Structure is relatively simple, maintains easily, and due to saving some components, can reduce hardware cost in this way.In addition, the 5th capacitor C5
For coupled capacitor, for preventing the interference between the second triode Q2 and third transistor Q3, therefore the safety of circuit and can
It is higher by property.It is noted that the capacitance of the 5th capacitor C5 is 350pF in the present embodiment, certainly, in practical applications,
The capacitance of 5th capacitor C5 can adjust accordingly as the case may be, that is, the capacitance of the 5th capacitor C5 can root
It is increased accordingly or is reduced according to concrete condition.
First triode Q1, the second triode Q2, first resistor R1, the second capacitor C2, third capacitor C3 and the one or two pole
Pipe D1 constitutes starting processing circuit, the 4th triode Q4, the 5th triode Q5,3rd resistor R3, the 5th resistance R5, the 4th capacitor
C4 and the 4th diode D4 constitutes delay startup circuit, in use, voltage output end Vo connection audio-video processing unit 1.The confession
Electric module 8 can realize the starting to audio-video processing unit 1, and after powering on power supply module 8, output voltage is opened by one
Dynamic process rises to given value with slower speed, to protect audio-video processing unit 1 not rushed on startup by surge
It hits.When starting, which also ensures 40 seconds or so optimum delay time.
In the present embodiment, the first triode Q1 and the second triode Q2 are NPN type triode, third transistor Q3,
Four triode Q4 and the 5th triode Q5 are NPN type triode.Certainly, in practical applications, the first triode Q1 and second
Triode Q2 can also be PNP type triode, and third transistor Q3, the 4th triode Q4 and the 5th triode Q5 can also be equal
For PNP type triode, but at this moment the structure of circuit also will accordingly change.
In the present embodiment, which further includes the 6th resistance R6, one end of the 6th resistance R6 and third diode D3
Cathode connection, the other end of the 6th resistance R6 connect with the base stage of the 5th triode Q5.6th resistance R6 is current-limiting resistance, is used
In carrying out current-limiting protection, to further enhance the safety and reliability of circuit.It is noted that in the present embodiment, the 6th
The resistance value of resistance R6 is 36k Ω, and certainly, in practical applications, the resistance value of the 6th resistance R6 can carry out phase as the case may be
It should adjust, that is, the resistance value of the 6th resistance R6 can be increased accordingly or be reduced as the case may be.
In the present embodiment, which further includes the 7th resistance R7, and one end of the 7th resistance R7 is with first resistor R1's
One end connection, the other end of the 7th resistance R7 are connect with the collector of the first triode Q1.7th resistance R7 is current-limiting resistance, is used
Current-limiting protection is carried out in the emitter current to the first triode Q1, to update the safety and reliability of step enhancing circuit.
It is noted that the resistance value of the 7th resistance R7 is 45k Ω in the present embodiment, certainly, in practical applications, the 7th resistance R7
Resistance value can adjust accordingly as the case may be, that is, the resistance value of the 7th resistance R7 can carry out as the case may be
It increases accordingly or reduces.
In the present embodiment, which further includes the 5th diode D5, the anode of the 5th diode D5 and the one or three pole
The emitter of pipe Q1 connects, and the cathode of the 5th diode D5 is connect with one end of second resistance R2.5th diode D5 is current limliting
Diode carries out current-limiting protection for the emitter current to the first triode Q1, to further enhance current limitation effect.It is worth one
It is mentioned that, in the present embodiment, the model L-2733 of the 5th diode D5, certainly, and in practical applications, the 5th diode D5
There can be the diode of similar functions using other models.
In short, in the present embodiment, which is used
Component is less, and circuit structure is relatively simple, maintains easily, due to saving some components, can reduce in this way hardware at
This.In addition, being equipped with coupled capacitor in the power supply module 8, therefore the safety and reliability of circuit is higher.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (7)
1. a kind of video conferencing system with circuit protection function, which is characterized in that including audio-video processing unit, wireless wheat
Gram wind, wire microphone, camera, display terminal, local computer, remote computer, power supply module and mobile terminal, it is described
Audio-video processing unit includes wireless communication module, audio processing modules, video processing module, Wireless microphone receiver, has
Line microphone jack and speaker, the wireless communication module are connect with the mobile terminal, and the wireless communication module is equipped with language
Sound output end and voice input terminal, the audio processing modules are equipped with the first audio input end, the second audio input end, third sound
Frequency input terminal, the first audio output, the second audio output and third audio output, the speech output end and described the
The connection of one audio input end, first audio output connect with the voice input terminal, second audio input end and
The Wireless microphone receiver connection, the wire microphone are connect with the wire microphone socket, wired Mike
Wind socket is also connect with second audio input end, and second audio output is connect with the speaker, the third sound
Frequency input terminal is connect with the local computer with the third audio output, and the Wireless microphone receiver passes through nothing
Line mode is connect with the wireless microphone, and the video processing module is equipped with video input interface and video output interface, institute
It states video input interface to connect with the camera, the video output interface is connect with the local computer, the display
Terminal is connect with the local computer, and the local computer is connect by network with the remote computer, the power supply
Module is connect with the audio-video processing unit；
The power supply module include transformer, bridge rectifier, first capacitor, first resistor, the second capacitor, the first triode,
Third capacitor, first diode, the second triode, the 5th capacitor, second resistance, third transistor, the second diode, the three or two
Pole pipe, the 4th triode, 3rd resistor, the 4th resistance, the 5th resistance, the 5th triode, the 4th diode, the 4th capacitor and electricity
Press output end, one end of one end connection 220V alternating current of the primary coil of the transformer, the primary coil of the transformer
The other end connect with the other end of the 220V alternating current, one end of the secondary coil of the transformer and the bridge rectifier
One input terminal of device connects, the other end of the secondary coil of another input terminal and transformer of the bridge rectifier
Connection, an output end of the bridge rectifier respectively with the anode of the first capacitor, one end of first resistor and first
The collector of triode connects, and the other end of the first resistor is connect with the anode of second capacitor, the first capacitor
Cathode and the cathode of the second capacitor connect with the another output of the bridge rectifier, the base of first triode
The anode of pole and the third capacitor is connect, the cathode of the third capacitor base stage and first with second triode respectively
The cathode of diode connects, and the emitter of the anode of the first diode and the second triode is negative with second capacitor
Pole connection, the collector of second triode are connect by the 5th capacitor with the base stage of the third transistor；
The emitter of first triode respectively with one end of the second resistance, the cathode of third diode, the five or three pole
The base stage of pipe is connected with one end of voltage output end, and the collector of the other end of the second resistance and the third transistor connects
It connects, the anode of the third diode is connect with the emitter of the 4th triode, the emitter point of the third transistor
It is not connect with the cathode of second diode, the collector of the 4th triode and one end of 3rd resistor, the two or two pole
The anode of pipe is connect with the other end of the emitter of second triode and 3rd resistor respectively, the hair of the 5th triode
Emitter-base bandgap grading is connect with one end of the 4th resistance, the other end of the 4th resistance respectively with the base stage of the 4th triode,
One end of 5th resistance is connected with the anode of the 4th diode, the collector of the 5th triode respectively with the four or two pole
The anode connection of the cathode of pipe and the 4th capacitor, the other end of the 5th resistance cathode and electricity with the 4th capacitor respectively
The other end connection of output end is pressed, the capacitance of the 5th capacitor is 350pF.
2. the video conferencing system according to claim 1 with circuit protection function, which is characterized in that the power supply mould
Block further includes the 6th resistance, and one end of the 6th resistance is connect with the cathode of the third diode, the 6th resistance
The other end is connect with the base stage of the 5th triode, and the resistance value of the 6th resistance is 36k Ω.
3. the video conferencing system according to claim 2 with circuit protection function, which is characterized in that the power supply mould
Block further includes the 7th resistance, and one end of the 7th resistance is connect with one end of the first resistor, the 7th resistance it is another
One end is connect with the collector of first triode, and the resistance value of the 7th resistance is 45k Ω.
4. the video conferencing system according to claim 3 with circuit protection function, which is characterized in that the power supply mould
Block further includes the 5th diode, and the anode of the 5th diode is connect with the emitter of first triode, and the described 5th
The cathode of diode is connect with one end of the second resistance, the model L-2733 of the 5th diode.
5. the video conferencing system according to any one of claims 1 to 4 with circuit protection function, feature exist
In first triode and the second triode are NPN type triode.
6. the video conferencing system according to any one of claims 1 to 4 with circuit protection function, feature exist
In the third transistor, the 4th triode and the 5th triode are NPN type triode.
7. the video conferencing system according to any one of claims 1 to 4 with circuit protection function, feature exist
In the wireless communication module is bluetooth module, WIFI module, gsm module, GPRS module, CDMA module, CDMA2000 mould
Block, WCDMA module, TD-SCDMA module, Zigbee module or LoRa module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811174900.2A CN109040659A (en) | 2018-10-09 | 2018-10-09 | Video conferencing system with circuit protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811174900.2A CN109040659A (en) | 2018-10-09 | 2018-10-09 | Video conferencing system with circuit protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109040659A true CN109040659A (en) | 2018-12-18 |
Family
ID=64616019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811174900.2A Pending CN109040659A (en) | 2018-10-09 | 2018-10-09 | Video conferencing system with circuit protection function |
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|---|---|
| CN (1) | CN109040659A (en) |
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| US7660428B2 (en) * | 2004-10-25 | 2010-02-09 | Polycom, Inc. | Ceiling microphone assembly |
| CN203827453U (en) * | 2013-11-29 | 2014-09-10 | 广州华工信元通信技术有限公司 | Video conference system |
| CN207625682U (en) * | 2017-12-27 | 2018-07-17 | 珠海市德宇辉煌信息科技有限公司 | Video monitoring equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7660428B2 (en) * | 2004-10-25 | 2010-02-09 | Polycom, Inc. | Ceiling microphone assembly |
| CN203827453U (en) * | 2013-11-29 | 2014-09-10 | 广州华工信元通信技术有限公司 | Video conference system |
| CN207625682U (en) * | 2017-12-27 | 2018-07-17 | 珠海市德宇辉煌信息科技有限公司 | Video monitoring equipment |
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