CN209390299U - High-power amplifier switching on and shutting down de-noising circuit - Google Patents
High-power amplifier switching on and shutting down de-noising circuit Download PDFInfo
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- CN209390299U CN209390299U CN201920402760.3U CN201920402760U CN209390299U CN 209390299 U CN209390299 U CN 209390299U CN 201920402760 U CN201920402760 U CN 201920402760U CN 209390299 U CN209390299 U CN 209390299U
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Abstract
The utility model belongs to public broadcasting sound technique field and discloses High-power amplifier switching on and shutting down de-noising circuit, when switching on and shutting down signal effectively (booting), power amplifier starts to power, supply voltage is sent into logical AND circuit after being via power up delay circuit delay, switching on and shutting down signal is sent into logical AND circuit, the entrance working condition of aforementioned 2 circuits co- controlling power amplifier through level shifting circuit.Since power on delay circuit causes logical AND circuit circuit delay to open power amplifier, i.e., power amplifier is opened after supply voltage is stablized.It can avoid causing the mutation of power amplifier input signal because of amplifier power supply voltage jump, and generate start-up noises.When switching on and shutting down invalidating signal (shutdown), off signal closes power amplifier by logical AND circuit immediately.Off signal will be such that amplifier power supply powers off, and due to the bulky capacitor effect of the filter capacitor of amplifier power supply, make the decline of amplifier power supply voltage slowly, then can guarantee and effectively close power amplifier before mutation occurs in amplifier power supply voltage, avoid shutdown noise.
Description
Technical field
The utility model is specifically related to High-power amplifier switching on and shutting down de-noising circuit, belongs to public broadcasting sound technique field.
Background technique
In high-power (hundreds of supreme kilowatts) broadcast stereo technical application, due to the change of switching on and shutting down instantaneous power voltage
Change, generates surge voltage by the coupling of capacitor and after High-power amplifier amplifies, generate strong impact noise, damage
Human auditory system organ or burning apparatus.
Utility model content
The technical problems to be solved in the utility model is to overcome existing defect, provides High-power amplifier switching on and shutting down de-noising electricity
In booting, by the starting-up signal that is delayed, after amplifier power supply voltage stabilization, power amplifier is opened, power amplifier is made to start work in road
Make, realizes noiseless booting；During shutdown, power amplifier is closed by off signal immediately, power amplifier is made to stop working, realize nothing
Noise shutdown, can effectively solve the problems in background technique.
In order to solve the above-mentioned technical problem, the utility model provides the following technical solution:
The utility model provides High-power amplifier switching on and shutting down de-noising circuit, and composition includes:
Level shifting circuit, level shifting circuit include resistance R1, resistance R2, resistance R3, resistance R4, diode D1 and ratio
Compared with device U1C, switching on and shutting down signal is connected with the resistance R1, and the other end of resistance R1 is connect with comparator U1C anode, the tie point
A voltage-stabiliser tube D1 and resistance R2 in parallel between ground, the one end resistance R3 are connected to ground, and the one end resistance R4 connects power supply VCC, electricity
Resistance R3 is connected with the other end of resistance R4, and resistance R3 and resistance R4 are connected to comparator U1C negative terminal.
Logical AND circuit, logical AND circuit include diode D3, diode D4, resistance R8, resistance R9, capacitor C3, resistance
R10 and triode Q1, comparator U1C connect with diode D3, and diode D3 connects with resistance R8, and in diode D3 and electricity
Hinder the diode D4 that connects on the circuit between R8, resistance R8 and triode Q1 base series, the collector of triode Q1 with
Resistance R9 connection, the emitter of triode Q1 are connect with capacitor C3, and in one resistance R10 of the side of capacitor C3 parallel connection；
Upper delay circuit, upper delay circuit include comparator U1B, capacitor C2, resistance R7, resistance R6, capacitor C1, resistance R5
It connects with diode D2, the diode D4 with comparator U1B anode, comparator U1B negative terminal is connect with resistance R6, resistance R6's
One end is connect with power supply VCC, a resistance R7 and capacitor C2 in parallel on the connection circuit between resistance R6 and comparator U1B,
Capacitor C2 and the resistance R7 other end are connected to ground, and comparator U1B connects with resistance R5, and one end of resistance R5 is connect with power supply VCC,
And a capacitor is connected on one diode D2 of the side of resistance R5 parallel connection, the circuit between resistance R5 and comparator U1B
C1 to ground.
Further, the comparator U1C negative terminal connects a fixed voltage, which is obtained by VCC through electric resistance partial pressure；
Comparator U1C anode connects an input voltage, which is obtained by starting-up signal through electric resistance partial pressure.
Further, the comparator U1B anode connects a voltage, and the RC integrating circuit which is made of R5 and C1 produces
Raw, RC integral constant is greater than 3 seconds, and resistance R5 simultaneously connects a diode, and diode negative terminal connects power supply VCC.
Further, the output end of the comparator U1B and comparator U1C respectively connects the negative terminal of a diode, and two
Pole pipe anode and after connecing the output of one emitter of driving transistor circuit, when which controls the work of power amplifier
Machine.
Level shifting circuit and power-up time delay circuit are respectively connected to logical AND circuit input end, logical AND circuit output end control
Power amplifier work state processed.
When switching on and shutting down signal effectively (booting), power amplifier starts to power, and supply voltage is sent after being via power up delay circuit delay
Enter logical AND circuit, switching on and shutting down signal is sent into logical AND circuit, aforementioned 2 circuit co- controllings power amplifier electricity through level shifting circuit
The entrance working condition on road.Since power on delay circuit causes logical AND circuit circuit delay to open power amplifier, i.e., in supply voltage
Power amplifier is opened after stabilization.It can avoid causing the mutation of power amplifier input signal because of amplifier power supply voltage jump, and generate start-up noises.
When switching on and shutting down invalidating signal (shutdown), off signal closes power amplifier by logical AND circuit immediately.Off signal will make power amplifier
Power cut-off is made the decline of amplifier power supply voltage slowly, then can guarantee due to the bulky capacitor effect of the filter capacitor of amplifier power supply
Amplifier power supply voltage is effective before there is mutation to close power amplifier, avoids shutdown noise.
The utility model beneficial effect achieved is: in booting, by the starting-up signal that is delayed, in amplifier power supply voltage
After stabilization, power amplifier is opened, so that power amplifier is started to work, realizes noiseless booting；During shutdown, pass through off signal immediately
Power amplifier is closed, so that power amplifier is stopped working, realizes noiseless shutdown.
Detailed description of the invention
Attached drawing is used to provide a further understanding of the present invention, and constitutes part of specification, practical with this
Novel embodiment is used to explain the utility model together, does not constitute limitations of the present invention.
In the accompanying drawings:
Fig. 1 is High-power amplifier switching on and shutting down de-noising circuit schematic diagram described in the utility model embodiment.
Specific embodiment
It is illustrated below in conjunction with preferred embodiment of the attached drawing to the utility model, it should be understood that described herein excellent
It selects embodiment to be only used for describing and explaining the present invention, is not used to limit the utility model.
Embodiment: referring to Fig. 1, the utility model High-power amplifier switching on and shutting down de-noising circuit, comprising:
Level shifting circuit, level shifting circuit include resistance R1, resistance R2, resistance R3, resistance R4, diode D1 and ratio
Compared with device U1C, switching on and shutting down signal is connected with the resistance R1, and the other end of resistance R1 is connect with comparator U1C anode, the tie point
A voltage-stabiliser tube D1 and resistance R2 in parallel between ground, the one end resistance R3 are connected to ground, and the one end resistance R4 connects power supply VCC, electricity
Resistance R3 is connected with the other end of resistance R4, and resistance R3 and resistance R4 are connected to comparator U1C negative terminal.
Logical AND circuit, logical AND circuit include diode D3, diode D4, resistance R8, resistance R9, capacitor C3, resistance
R10 and triode Q1, comparator U1C connect with diode D3, and diode D3 connects with resistance R8, and in diode D3 and electricity
Hinder the diode D4 that connects on the circuit between R8, resistance R8 and triode Q1 base series, the collector of triode Q1 with
Resistance R9 connection, the emitter of triode Q1 are connect with capacitor C3, and in one resistance R10 of the side of capacitor C3 parallel connection；
Power on delay circuit, power on delay circuit include comparator U1B, capacitor C2, resistance R7, resistance R6, capacitor C1, electricity
R5 and diode D2 is hindered, the diode D4 connects with comparator U1B anode, and comparator U1B negative terminal is connect with resistance R6, resistance
One end of R6 is connect with power supply VCC, a resistance R7 and capacitor in parallel on the connection circuit between resistance R6 and comparator U1B
C2, capacitor C2 and resistance the R7 other end are connected to ground, and comparator U1B connects with resistance R5, and one end of resistance R5 and power supply VCC connect
It connects, and connects an electricity on one diode D2 of the side of resistance R5 parallel connection, the circuit between resistance R5 and comparator U1B
Hold C1 to ground.
When starting-up signal effective (booting), power amplifier starts to power.
At this point, supply voltage is sent into " logical AND circuit " after " power on delay circuit " delay, switching on and shutting down signal passes through " level
Conversion circuit " feeding " logical AND circuit ", the entrance working condition of aforementioned 2 circuits co- controlling power amplifier.
Since power on delay circuit causes " logical AND circuit " circuit delay to open power amplifier, i.e., opened after supply voltage is stablized
Open power amplifier.It can avoid causing the mutation of power amplifier input signal because of amplifier power supply voltage jump, and generate start-up noises.
When switching on and shutting down invalidating signal (shutdown), off signal closes power amplifier by " logical AND circuit " immediately.Meanwhile it closing
Machine signal will be such that amplifier power supply powers off, and in the bulky capacitor effect of the filter capacitor of amplifier power supply, keep the decline of amplifier power supply voltage slow
Slowly, then it can guarantee and effectively close power amplifier before mutation occurs in amplifier power supply voltage, avoid shutdown noise.
Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention, it is not limited to this
Utility model, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art
For, it is still possible to modify the technical solutions described in the foregoing embodiments, or to part of technical characteristic
It is equivalently replaced.Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on,
It should be included within the scope of protection of this utility model.
Claims (4)
1. High-power amplifier switching on and shutting down de-noising circuit, it is characterised in that: include:
Level shifting circuit, level shifting circuit include resistance R1, resistance R2, resistance R3, resistance R4, diode D1 and comparator
U1C, switching on and shutting down signal are connected with the resistance R1, and the other end of resistance R1 is connect with comparator U1C anode, the tie point and ground
Between parallel connection one voltage-stabiliser tube D1 and resistance R2, the one end resistance R3 be connected to ground, the one end resistance R4 connect power supply VCC, resistance R3
It is connected with the other end of resistance R4, and resistance R3 and resistance R4 are connected to comparator U1C negative terminal；
Logical AND circuit, logical AND circuit include diode D3, diode D4, resistance R8, resistance R9, capacitor C3, resistance R10 and
Triode Q1, comparator U1C connect with diode D3, and diode D3 connects with resistance R8, and in diode D3 and resistance R8
Between circuit on connect a diode D4, resistance R8 and triode Q1 base series, the collector and resistance of triode Q1
The emitter of R9 connection, triode Q1 is connect with capacitor C3, and in one resistance R10 of the side of capacitor C3 parallel connection；
Upper delay circuit, upper delay circuit include comparator U1B, capacitor C2, resistance R7, resistance R6, capacitor C1, resistance R5 and two
Pole pipe D2, the diode D4 connect with comparator U1B anode, and comparator U1B negative terminal is connect with resistance R6, one end of resistance R6
It is connect with power supply VCC, a resistance R7 and capacitor C2 in parallel, capacitor on the connection circuit between resistance R6 and comparator U1B
C2 and the resistance R7 other end are connected to ground, and comparator U1B connects with resistance R5, and one end of resistance R5 is connect with power supply VCC, and
A capacitor C1 is connected on one diode D2 of the side of resistance R5 parallel connection, the circuit between resistance R5 and comparator U1B to arrive
Ground.
2. High-power amplifier switching on and shutting down de-noising circuit according to claim 1, it is characterised in that: the comparator U1C is negative
One fixed voltage of end connection, the voltage are obtained by VCC through electric resistance partial pressure；Comparator U1C anode connects an input voltage, the electricity
Pressure is obtained by starting-up signal through electric resistance partial pressure.
3. High-power amplifier switching on and shutting down de-noising circuit according to claim 1, it is characterised in that: the comparator U1C is just
One voltage of end connection, the RC integrating circuit which is made of resistance R5 and capacitor C1 generate, and RC integral constant is greater than 3 seconds, electricity
Resistance R5 simultaneously connects a diode, and diode negative terminal connects power supply VCC.
4. High-power amplifier switching on and shutting down de-noising circuit according to claim 1, it is characterised in that: the comparator U1B and
The output end of comparator U1C respectively connects the negative terminal of a diode, diode anode and one emitter output of driving after connecing
Transistor circuit, the output signal control power amplifier work opportunity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920402760.3U CN209390299U (en) | 2019-03-28 | 2019-03-28 | High-power amplifier switching on and shutting down de-noising circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920402760.3U CN209390299U (en) | 2019-03-28 | 2019-03-28 | High-power amplifier switching on and shutting down de-noising circuit |
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| Publication Number | Publication Date |
|---|---|
| CN209390299U true CN209390299U (en) | 2019-09-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920402760.3U Active CN209390299U (en) | 2019-03-28 | 2019-03-28 | High-power amplifier switching on and shutting down de-noising circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111179873A (en) * | 2020-02-19 | 2020-05-19 | 京东方科技集团股份有限公司 | Shutdown noise reduction circuit, shutdown noise reduction chip and display device |
-
2019
- 2019-03-28 CN CN201920402760.3U patent/CN209390299U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111179873A (en) * | 2020-02-19 | 2020-05-19 | 京东方科技集团股份有限公司 | Shutdown noise reduction circuit, shutdown noise reduction chip and display device |
| CN111179873B (en) * | 2020-02-19 | 2022-12-06 | 京东方科技集团股份有限公司 | Shutdown noise reduction circuit, shutdown noise reduction chip and display device |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
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Address after: 518000 202, building 10, Shenzhen Software Park, kejizhong 2nd Road, high tech Zone, Nanshan District, Shenzhen City, Guangdong Province Patentee after: Shenzhen AVIC bit Communication Technology Co.,Ltd. Address before: 518000 202, building 10, Shenzhen Software Park, kejizhong 2nd Road, high tech Zone, Nanshan District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN CITY AVIC BIT COMMUNICATION TECHNOLOGY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |