CN207283788U - A kind of frequency switch circuit and interactive whiteboard all-in-one machine - Google Patents
A kind of frequency switch circuit and interactive whiteboard all-in-one machine Download PDFInfo
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- CN207283788U CN207283788U CN201721318531.0U CN201721318531U CN207283788U CN 207283788 U CN207283788 U CN 207283788U CN 201721318531 U CN201721318531 U CN 201721318531U CN 207283788 U CN207283788 U CN 207283788U
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Abstract
The utility model discloses a kind of frequency switch circuit and interactive whiteboard all-in-one machine, it includes, and the first audio signal enables interface, the second audio signal enables interface, on-off circuit, the first relay, the second relay, the first audio signal interface, the second audio signal interface, the first loudspeaker and the second loudspeaker.Interactive whiteboard all-in-one machine, including processor, power amplifier, network unit and broadcast interface, the processor are connected with the power amplifier and network unit respectively, it further includes above-mentioned frequency switch circuit.The utility model sound intermediate frequency switching electricity receives exterior enable signal by on-off circuit, utilizes the output of the first relay and the second relay switched audio signal.In addition, interactive whiteboard all-in-one machine includes above-mentioned frequency switch circuit in the utility model, when receiving the broadcast singal of outside, broadcast mode can be automatically switched to by frequency switch circuit, prevent electric leakage important information.
Description
Technical field
It the utility model is related to multimedia interactive teaching field of terminal technology, more particularly to a kind of frequency switch circuit and friendship
Mutual formula blank all-in-one machine.
Background technology
At present, while revolutionary new product occurs in intelligent multimedia education sector, with the appearance of laser projection,
Because it possesses the characteristics of long-life, rich in color, high-resolution and low-power consumption, DLP (Digital are changed
LightProcessing, digital light processing) etc. conventional projectors shortcomings so that laser projection is obtained in education sector
To being widely applied.Therefore, the interactive whiteboard all-in-one machine for possessing the collection multiple functions of multiple spot writing coordinates laser projection,
It will be optimal intellectual product in intelligent multimedia education.
Interactive whiteboard all-in-one machine, coordinates high-definition laser projector, integrated multiple spot Accurate touch, middle control centralized control system, OPS
C (Open Pluggable Specification, open pluggable specification) computer box, digital exhibition booth, record with hall, HIFI
(High-Fidelity, high-fidelity) high power acoustics system, multiple interfaces terminal, pressure sensitivity smart pen, shortcut panel and have
The accessory devices such as line/wireless telecommunications form.
However, existing interactive whiteboard all-in-one machine, does not play the function of broadcast or needs user to go to open broadcast,
Blank all-in-one machine is widely applied in education sectors such as school, training organizations, often goes to report by broadcast in school
Documentary whip, if blank all-in-one machine does not have broadcast capability or needs manually oneself to go to open, it is likely that therefore miss
Documentary whip.
Utility model content
In order to solve the above-mentioned technical problem, the purpose of this utility model is to provide a kind of frequency switch circuit.
In order to solve the above-mentioned technical problem, the purpose of this utility model is to provide a kind of broadcast mode of automatically switching to
Interactive whiteboard all-in-one machine.
Technical solution is used by the utility model：A kind of frequency switch circuit, it includes the first audio signal and enables
Interface, the second audio signal enable interface, on-off circuit, the first relay, the second relay, the first audio signal interface,
Two audio signal interfaces, the first loudspeaker and the second loudspeaker, the input terminal of the on-off circuit respectively with the first audio signal
Enabled interface and the second audio signal enable the output terminal connection of interface, and the output terminal of the on-off circuit is respectively with described first
The input terminal of relay and the second relay connects, the output terminal of first audio signal interface respectively with first relay
The input terminal of device and the second relay connects, the output terminal of second audio signal interface respectively with first relay and
The input terminal connection of second relay, the output terminal of first relay is connected with the input terminal of first loudspeaker, described
The output terminal of second relay is connected with the input terminal of second loudspeaker.
Further, the on-off circuit includes the first triode, the second triode, the 3rd triode, the 4th triode, the
One metal-oxide-semiconductor, the first shunt resistance, the second shunt resistance and charge and discharge capacitance, emitter and the ground of first triode connect
Connect, its collector is connected by the second relay with power supply, and the emitter of second triode is connected to ground, its collector leads to
The first relay is crossed to be connected with power supply, the power supply by the first current-limiting resistance respectively with first triode and the two or three pole
The base stage connection of pipe；The emitter of 3rd triode is connected to ground, its collector and first triode and the two or three
The base stage connection of pole pipe, the base stage of the 3rd triode are connected with the drain electrode of first metal-oxide-semiconductor；First metal-oxide-semiconductor
Source electrode is connected with power supply, and the collector of its grid and the 4th triode connects；The collector of 4th triode passes through
Two current-limiting resistances are connected with power supply, its emitter is connected to ground, its base stage enables interface with first audio signal and is connected, institute
State the second audio signal and enable interface and provide power supply for circuit；The negative terminal of the charge and discharge capacitance is connected to ground, its terminal and institute
State the grid connection of the first metal-oxide-semiconductor.
Further, first triode, the second triode, the 3rd triode and the 4th triode are NPN type three
Pole pipe.
Further, first metal-oxide-semiconductor is P-channel metal-oxide-semiconductor.
A kind of interactive whiteboard all-in-one machine, including processor, power amplifier, network unit, power supply and broadcast interface,
The processor is connected with the power amplifier, power supply and network unit respectively, it further includes above-mentioned Audio conversion electricity
Road, the output terminal of the power amplifier are connected with first audio signal interface, and the broadcast interface is respectively with described
Two audio signal interfaces and the first audio signal enable interface connection.
Further, it is in series with coupled capacitor between the broadcast interface and second audio signal interface.
Further, the broadcast interface and first audio signal are connected with filter circuit between enabling interface.
Further, the filter circuit includes 3rd resistor, the 4th resistance and the second capacitance, and the one of the 3rd resistor
Broadcast interface is held, the other end is connected by the second capacitance with the input terminal of the on-off circuit, described 4th resistance one end and institute
The input terminal connection of on-off circuit is stated, the other end is connected to ground.
The beneficial effects of the utility model are：The utility model sound intermediate frequency switching circuit is enabled including the first audio signal and connect
Mouth, the second audio signal enable interface, on-off circuit, the first relay, the second relay, the first audio signal interface, second
Audio signal interface, the first loudspeaker and the second loudspeaker, receive exterior enable signal by on-off circuit, utilize the first relay
With the output of the second relay switched audio signal.
In addition, interactive whiteboard all-in-one machine includes above-mentioned frequency switch circuit in the utility model, when receiving outside
Broadcast singal when, broadcast mode can be automatically switched to by frequency switch circuit, prevent electric leakage important information.
Brief description of the drawings
Specific embodiment of the present utility model is described further below in conjunction with the accompanying drawings：
Fig. 1 is a kind of high-level schematic functional block diagram of frequency switch circuit in the utility model；
Fig. 2 is the circuit diagram of the utility model；
Fig. 3 is a kind of functional block diagram of interactive whiteboard all-in-one machine in the utility model.
Embodiment
It should be noted that in the case where there is no conflict, the feature in embodiment and embodiment in the application can phase
Mutually combination.
As shown in Figure 1, a kind of frequency switch circuit, it includes, and the first audio signal enables interface, the second audio signal makes
Can interface, on-off circuit, the first relay, the second relay, the first audio signal interface, the second audio signal interface, first
Loudspeaker and the second loudspeaker, the input terminal of the on-off circuit enable interface and the second audio letter with the first audio signal respectively
The output terminal connection of number enabled interface, the output terminal of the on-off circuit respectively with first relay and the second relay
Input terminal connects, the output terminal input with first relay and the second relay respectively of first audio signal interface
End connection, the output terminal of second audio signal interface connect with the input terminal of first relay and the second relay respectively
Connect, the output terminal of first relay is connected with the input terminal of first loudspeaker, the output terminal of second relay with
The input terminal connection of second loudspeaker.
The audio signal that first audio signal interface, the second audio signal interface receive passes through the first relay and second
Relay is exported to the first loudspeaker, the second loudspeaker, by the first audio signal interface, the second audio signal interface, is received exterior
Enable signal, then by on-off circuit, control the on off state of the first relay and the second relay, realize that audio signal switches
Output.
As shown in Fig. 2, a kind of interactive whiteboard all-in-one machine, including processor, power amplifier, network unit, power supply with
And broadcast interface, the processor are connected with the power amplifier, power supply and network unit respectively, it further includes above-mentioned
Frequency switch circuit, the output terminal of the power amplifier are connected with first audio signal interface, the broadcast interface point
Interface is not enabled with second audio signal interface and the first audio signal to be connected.
When receiving the broadcast singal of outside, broadcast interface can be switched to by frequency switch circuit, by broadcast interface
The audio signal of output is played by loudspeaker, prevents electric leakage important information.
Embodiment 1
The on-off circuit include the first triode Q3, the second triode Q4, the 3rd triode Q5, the 4th triode Q7,
First metal-oxide-semiconductor Q6, the first shunt resistance R30, the second shunt resistance R35 and charge and discharge capacitance E6, the first triode Q3
Emitter be connected to ground, its collector is connected by the second relay S2 with power supply, the emitter of the second triode Q4
Be connected to ground, its collector is connected by the first relay S1 with power supply, the power supply by the first current-limiting resistance respectively with institute
State the base stage connection of the first triode Q3 and the second triode Q4；The emitter of the 3rd triode Q5 is connected to ground, it collects
Electrode is connected with the base stage of the first triode Q3 and the second triode Q4, the base stage of the 3rd triode Q5 and described the
The drain electrode connection of one metal-oxide-semiconductor Q6；The source electrode of the first metal-oxide-semiconductor Q6 is connected with power supply, its grid and the 4th triode Q7
Collector connect；The collector of the 4th triode Q7 is connected by the second current-limiting resistance with power supply, its emitter connects with ground
Connect, its base stage enables interface with first audio signal and is connected, and second audio signal enables interface and provides electricity for circuit
Source；The negative terminal of the charge and discharge capacitance E6 is connected to ground, its terminal is connected with the grid of the first metal-oxide-semiconductor Q6.It is wherein described
First triode Q3, the second triode Q4, the 3rd triode Q5 and the 4th triode Q7 are NPN type triode.Described
One metal-oxide-semiconductor Q6 is P-channel metal-oxide-semiconductor.
Preferred embodiment is further used as, is in series between broadcast interface and the second audio signal interface CN12
First coupled capacitor E7, the second coupled capacitor E8, the 3rd coupled capacitor E14 and the 4th coupled capacitor E15.
Preferred embodiment is further used as, the broadcast interface and first audio signal are enabled between interface GL
It is connected with filter circuit.The filter circuit includes 3rd resistor R36, the 4th resistance R76 and the second capacitance C38, and described
One end broadcast interface of three resistance R36, the other end is connected by the second capacitance C38 with the input terminal of the on-off circuit, described
4th resistance R76 one end is connected with the input terminal of the on-off circuit, and the other end is connected to ground.
State one：Machine shutdown state
Such as Fig. 3, when machine does not have under "on" position, broadcast singal is input to CN12 from transformer secondary output, by first
Coupled capacitor E7, the second coupled capacitor E8, the 3rd coupled capacitor E14 are from GP-R；GP-L feet are input to the first relay S1, second
The 3 of relay S2；5 feet, because due to being off-mode, non-transformer input, the first relay S1, the second relay S2 do not have at this time
Powering on, the 3 and 8 normally closed conjunctions of foot of the first relay S1, the second relay S2, the 5 and 7 normally closed conjunctions of foot, loudspeaker are output to from CN11,
Realizing can play without broadcasting and under open state.
State two：Machine open state
Such as Fig. 3, when machine is started shooting, when power supply charges abundant electric capacitance E6 by the second shunt resistance R35, first
Metal-oxide-semiconductor Q6 is turned on, and turns on the 3rd metal-oxide-semiconductor Q5, so that the first triode Q3, the second triode Q4 cut-off, makes the first relay
The 3 and 8 normally closed conjunctions of foot of device S1, the second relay S2,5 and 7 foot normal closure states.
When the second shunt resistance R35 is charged to close to 5V charge and discharge capacitance E6, the first metal-oxide-semiconductor Q6 field-effect tube is cut
Only, end the 3rd triode Q5, so that the first triode Q3, the second triode Q4 are turned on, make the first relay S1, second
Relay S2 work 4 and 8 feet closures, 6 and 7 foot closure states, access machine power amplifier
When there is broadcast, for signal by 3rd resistor R36, the second capacitance C38 turns on the 4th triode Q7, makes discharge and recharge
Capacitance E6 discharges, and turns on the first metal-oxide-semiconductor Q6, turns on the 3rd triode Q5, so that the first triode Q3, the second triode
Q4 ends, and makes the 3 and 8 normally closed conjunctions of foot of the first relay S1, the second relay S2, the 5 and 7 normally closed conjunctions of foot, make relay access wide
Broadcast signal condition.
When not broadcasting, the 4th triode Q7 cut-offs, the second shunt resistance R35 is charged to charge and discharge capacitance E6 close
During 5V (supply voltage), the first metal-oxide-semiconductor Q6 cut-offs, end the 3rd triode Q5, so that the first triode Q3, the two or three pole
Pipe Q4 is turned on, and the first relay S1, the second relay S2 is worked, and 4 and 8 feet closure, 6 and 7 foot closure states, access machine
Power amplifier state.So that machine preferential answering broadcast singal.
Above is the preferable of the utility model is implemented to be illustrated, but the invention is not limited to the reality
Example is applied, those skilled in the art can also make a variety of equivalent changes on the premise of without prejudice to the utility model spirit
Shape or replacement, these equivalent deformations or replacement are all contained in the application claim limited range.
Claims (8)
- A kind of 1. frequency switch circuit, it is characterised in that：It includes that the first audio signal enables interface, the second audio signal enables Interface, on-off circuit, the first relay, the second relay, the first audio signal interface, the second audio signal interface, the first loudspeaker And the second loudspeaker, the input terminal of the on-off circuit enable interface and the second audio signal with the first audio signal respectively The output terminal connection of enabled interface, the output terminal of the on-off circuit are defeated with first relay and the second relay respectively Enter end connection, the output terminal of first audio signal interface respectively with first relay and the input terminal of the second relay Connection, the output terminal of second audio signal interface connect with the input terminal of first relay and the second relay respectively Connect, the output terminal of first relay is connected with the input terminal of first loudspeaker, the output terminal of second relay with The input terminal connection of second loudspeaker.
- 2. frequency switch circuit according to claim 1, it is characterised in that：The on-off circuit include the first triode, Second triode, the 3rd triode, the 4th triode, the first metal-oxide-semiconductor, the first shunt resistance, the second shunt resistance and charge and discharge Capacitance, the emitter of first triode are connected to ground, its collector is connected by the second relay with power supply, and described The emitter of two triodes is connected to ground, its collector is connected by the first relay with power supply, and the power supply passes through the first limit Base stage of the leakage resistance respectively with first triode and the second triode is connected；The emitter of 3rd triode is connected to ground, the base stage of its collector and first triode and the second triode Connection, the base stage of the 3rd triode are connected with the drain electrode of first metal-oxide-semiconductor；The source electrode of first metal-oxide-semiconductor is connected with power supply, and the collector of its grid and the 4th triode connects；The collector of 4th triode is connected by the second current-limiting resistance with power supply, its emitter is connected to ground, its base stage Interface is enabled with first audio signal to be connected, second audio signal enables interface and provides power supply for circuit；The negative terminal of the charge and discharge capacitance is connected to ground, its terminal is connected with the grid of first metal-oxide-semiconductor.
- 3. frequency switch circuit according to claim 2, it is characterised in that：First triode, the second triode, Three triodes and the 4th triode are NPN type triode.
- 4. frequency switch circuit according to claim 2, it is characterised in that：First metal-oxide-semiconductor is P-channel metal-oxide-semiconductor.
- 5. a kind of interactive whiteboard all-in-one machine, including processor, power amplifier, network unit, power supply and broadcast interface, institute Processor is stated to be connected with the power amplifier, power supply and network unit respectively, it is characterised in that：It further includes right such as will 1 to 4 any one of them frequency switch circuit is sought, the output terminal of the power amplifier connects with first audio signal interface Connect, the broadcast interface enables interface with second audio signal interface and the first audio signal respectively and is connected.
- 6. interactive whiteboard all-in-one machine according to claim 5, it is characterised in that：The broadcast interface and second sound Coupled capacitor is in series between frequency signaling interface.
- 7. interactive whiteboard all-in-one machine according to claim 5, it is characterised in that：The broadcast interface and first sound Frequency signal is connected with filter circuit between enabling interface.
- 8. interactive whiteboard all-in-one machine according to claim 7, it is characterised in that：The filter circuit includes the 3rd electricity Resistance, the 4th resistance and the second capacitance, one end broadcast interface of the 3rd resistor, the other end are opened by the second capacitance with described The input terminal connection on powered-down road, described 4th resistance one end are connected with the input terminal of the on-off circuit, and the other end is connected to ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721318531.0U CN207283788U (en) | 2017-10-11 | 2017-10-11 | A kind of frequency switch circuit and interactive whiteboard all-in-one machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721318531.0U CN207283788U (en) | 2017-10-11 | 2017-10-11 | A kind of frequency switch circuit and interactive whiteboard all-in-one machine |
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| Publication Number | Publication Date |
|---|---|
| CN207283788U true CN207283788U (en) | 2018-04-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113078523A (en) * | 2021-03-18 | 2021-07-06 | 深圳市智微智能科技股份有限公司 | Protection circuit of OPS connector |
-
2017
- 2017-10-11 CN CN201721318531.0U patent/CN207283788U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113078523A (en) * | 2021-03-18 | 2021-07-06 | 深圳市智微智能科技股份有限公司 | Protection circuit of OPS connector |
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