CN102769729B - Television and audio external play control circuit thereof - Google Patents
Television and audio external play control circuit thereof Download PDFInfo
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- CN102769729B CN102769729B CN201210207218.5A CN201210207218A CN102769729B CN 102769729 B CN102769729 B CN 102769729B CN 201210207218 A CN201210207218 A CN 201210207218A CN 102769729 B CN102769729 B CN 102769729B
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Abstract
The invention is applied to the field of television control, and provides a television and an audio external play control circuit thereof. The audio external play control circuit of the television comprising a power supply module, an on and off detection module, a power amplification module and an audio output control module is adopted, so that the working condition of the power amplification module can be controlled according to voltage change of the power supply module, so the television is prevented from outputting current surge sound to a built-in loudspeaker or an external passive speaker when being turned on and off, meanwhile, output channel handover can be carried out on a left sound channel digital audio signal and a right sound channel digital audio signal according to an access state of the external passive speaker, so that the phenomenon of mixcellaneous interferences occurring when audio play is carried out is avoided. The whole audio external play control circuit of the television has the advantages of simple structure, low cost and small power consumption so as to solve the problems of low audio external play definition, high cost and large power consumption in the prior art.
Description
Technical field
The invention belongs to television set control field, relate in particular to a kind of television set and audio frequency thereof and put control circuit outward.
Background technology
Along with scientific and technical development, the integrated level of electronic circuit is more and more higher, and volume is more and more less, and thick and heavy to lightening development from the past of the profile that has greatly promoted television product, thereby expedited the emergence of panel TV set, it has the feature lightweight, volume is little.So, for panel TV set, its built-in loud speaker is because the restriction of volume also becomes more and more less.Yet the fixed position of loud speaker is unreasonable can cause that outer sound reproduction sound is little, distortion is large and the problem such as fuselage shaking is large, and then had a strong impact on the audio frequency result of broadcast of television set.
In order to address the above problem, prior art is by being equipped with external passive audio amplifier for panel TV set, and will carry out power amplification processing from the audio frequency small-signal of audio-frequency signal processing module output by two power amplifiers at inside television, export respectively built-in loud speaker and audio frequency terminal to, and play to realize audio frequency by audio frequency terminal output audio large-signal to external passive audio amplifier.Yet, two power amplifiers of available technology adopting can cause the cost of television set to increase and power consumption strengthens, and when external passive loudspeaker box connecting TV machine, boombox and external passive audio amplifier are worked simultaneously, can cause both to occur that in the course of the work sound mixes the situation of crosstalking, and then reduction audio frequency is put definition outward.Therefore, prior art exists audio frequency to put the problem that definition is low, cost is high and power consumption is large outward.
Summary of the invention
The object of the present invention is to provide a kind of tv audio to put control circuit outward, be intended to solve the existing audio frequency of prior art and put the problem that definition is low, cost is high and power consumption is large outward.
The present invention realizes like this, a kind of tv audio is put control circuit outward, be connected with power supply, audio-frequency signal processing module, audio frequency terminal and the boombox of television set, described audio-frequency signal processing module output left channel analog audio signal, right channel analog audio signal and quiet control signal, described audio frequency terminal connects external passive audio amplifier, and described tv audio is put control circuit outward and comprised:
Supply module, switching on and shutting down detection module, power amplifier module and audio frequency output control module;
The input of described supply module, the first output and the second output respectively with the output of described power supply, the power end of the power end of described power amplifier module and described audio frequency output control module be connected, described supply module, for the direct current of described power supply output being carried out after high-frequency signal filtering and filtering processing, is described power amplifier module and the power supply of described audio frequency output control module;
The input of described switching on and shutting down detection module is connected with the first output of described supply module and the switch control end of described power amplifier module respectively with output, and described switching on and shutting down detection module is for exporting corresponding control level signal according to the change in voltage of the first output of described supply module;
The quiet control end of described power amplifier module, L channel audio input end and right audio channel input are connected with quiet control signal output, L channel audio output and the right audio channel output of described audio-frequency signal processing module respectively, described power amplifier module is for when described control level signal being high level and described quiet control signal while being low level, to described left channel analog audio signal and described right channel analog audio signal change and amplify process after generation left channel digital audio signal and right channel digital audio signal;
The left channel signals input of described audio frequency output control module is connected with right-channel signals output with the left channel signals output of described power amplifier module respectively with right-channel signals input, the external output of L channel and the external output of R channel connect respectively the first pin and the 4th pin of described audio frequency terminal, the internal output of L channel and the internal output of R channel connect respectively left channel signals end and the right-channel signals end of described boombox, described audio frequency output control module for carrying out output channel switching controls to described left channel digital audio signal and described right channel digital audio signal between described audio frequency terminal and described boombox.
Another object of the present invention is also to provide a kind of television set, described television set comprises that tv audio is put control circuit, power supply, audio-frequency signal processing module, audio frequency terminal outward and boombox connects, described audio-frequency signal processing module output left channel analog audio signal, right channel analog audio signal and quiet control signal, described audio frequency terminal connects external passive audio amplifier, and described tv audio is put control circuit outward and comprised:
Supply module, switching on and shutting down detection module, power amplifier module and audio frequency output control module;
The input of described supply module, the first output and the second output respectively with the output of described power supply, the power end of the power end of described power amplifier module and described audio frequency output control module be connected, described supply module, for the direct current of described power supply output being carried out after high-frequency signal filtering and filtering processing, is described power amplifier module and the power supply of described audio frequency output control module;
The input of described switching on and shutting down detection module is connected with the first output of described supply module and the switch control end of described power amplifier module respectively with output, and described switching on and shutting down detection module is for exporting corresponding control level signal according to the change in voltage of the first output of described supply module;
The quiet control end of described power amplifier module, L channel audio input end and right audio channel input are connected with quiet control signal output, L channel audio output and the right audio channel output of described audio-frequency signal processing module respectively, described power amplifier module is for when described control level signal being high level and described quiet control signal while being low level, to described left channel analog audio signal and described right channel analog audio signal change and amplify process after generation left channel digital audio signal and right channel digital audio signal;
The left channel signals input of described audio frequency output control module is connected with right-channel signals output with the left channel signals output of described power amplifier module respectively with right-channel signals input, the external output of L channel and the external output of R channel connect respectively the first pin and the 4th pin of described audio frequency terminal, the internal output of L channel and the internal output of R channel connect respectively left channel signals end and the right-channel signals end of described boombox, described audio frequency output control module for carrying out output channel switching controls to described left channel digital audio signal and described right channel digital audio signal between described audio frequency terminal and described boombox.
In the present invention, by employing, comprise described supply module, described switching on and shutting down detection module, the tv audio of described power amplifier module and described audio frequency output control module is put control circuit outward, the operating state that can control described power amplifier module according to the change in voltage of described supply module is to prevent when the TV power on and off to described boombox or described external passive audio amplifier output current impulsive sound, simultaneously can to left and right acoustic channels digital audio and video signals, carry out the phenomenon that interference appears mixing when avoiding audio frequency to play in output channel switching according to the access state of described external passive audio amplifier, it is simple in structure that whole tv audio is put control circuit outward, cost is low and power consumption is little, thereby having solved the existing audio frequency of prior art, to put definition outward low, the problem that cost is high and power consumption is large.
Accompanying drawing explanation
Fig. 1 is the modular structure figure that tv audio that the embodiment of the present invention provides is put control circuit outward;
Fig. 2 is the exemplary circuit structure chart that tv audio that the embodiment of the present invention provides is put control circuit outward.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
In embodiments of the present invention, by employing, comprise supply module, switching on and shutting down detection module, the tv audio of power amplifier module and audio frequency output control module is put control circuit outward, can be according to the operating state of the change in voltage power ratio control amplification module of supply module to prevent when the TV power on and off to boombox or external passive audio amplifier output current impulsive sound, simultaneously can to left and right acoustic channels digital audio and video signals, carry out the phenomenon that interference appears mixing when avoiding audio frequency to play in output channel switching according to the access state of external passive audio amplifier, it is simple in structure that whole tv audio is put control circuit outward, cost is low and power consumption is little.
The modular structure that the tv audio that Fig. 1 shows the embodiment of the present invention to be provided is put control circuit outward, for convenience of explanation, only shows part related to the present invention, and details are as follows:
Tv audio is put control circuit 100 outward and is connected with power supply 200, audio-frequency signal processing module 300, audio frequency terminal 400 and the boombox 500 of television set, audio-frequency signal processing module 300 output left channel analog audio signal, right channel analog audio signal and quiet control signals, audio frequency terminal 400 connects external passive audio amplifier 600, and tv audio is put control circuit 100 outward and comprised:
Supply module 101, switching on and shutting down detection module 102, power amplifier module 103 and audio frequency output control module 104;
The input of supply module 101, the first output and the second output are connected with the power end of the output of power supply 200, the power end of power amplifier module 103 and audio frequency output control module 104 respectively, supply module 101, for the direct current of power supply 200 outputs being carried out after high-frequency signal filtering and filtering processing, is power amplifier module 103 and 104 power supplies of audio frequency output control module;
The input of switching on and shutting down detection module 102 is connected with the first output of supply module 101 and the switch control end of power amplifier module 103 respectively with output, and switching on and shutting down detection module 102 is for exporting corresponding control level signal according to the change in voltage of the first output of supply module 101;
The quiet control end of power amplifier module 103, L channel audio input end and right audio channel input respectively with the quiet control signal output MUTE of audio-frequency signal processing module 300, L channel audio output LA and right audio channel output RA are connected, when the quiet control signal that power amplifier module 103 is high level and audio-frequency signal processing module 300 outputs for the control level signal when 102 outputs of switching on and shutting down detection module is low level, the left channel analog audio signal of audio-frequency signal processing module 300 outputs and right channel analog audio signal are changed and amplified and process rear left channel digital audio signal and the right channel digital audio signal of generating,
The left channel signals input of audio frequency output control module 104 is connected with right-channel signals output with the left channel signals output of power amplifier module 103 respectively with right-channel signals input, the external output of L channel and the external output of R channel connect respectively the first pin 1 and the 4th pin 4 ends of audio frequency terminal 400, the internal output of L channel and the internal output of R channel meet respectively left channel signals end L and the right-channel signals end R of boombox 500, audio frequency output control module 104 carries out output channel switching controls for the left channel digital audio signal and the right channel digital audio signal that between audio frequency terminal 400 and boombox 500, power amplifier module 103 are generated.
In embodiments of the present invention, audio signal and control signal that input access each signaling interface of inside television (comprising the input interfaces such as AV, TV, YPbPr, HDMI and USB) of audio-frequency signal processing module 300 is inputted, and this audio signal is selected and gained to promote and process rear output left channel analog audio signal, right channel analog audio signal and the quiet power amplifier module 103 that controls signal to; The crus secunda 2 of audio frequency terminal 400 and tripod 3 are connected to ground altogether, external passive audio amplifier 600 can be connected with audio frequency terminal 400 according to user's request, when external passive audio amplifier 600 is connected with audio frequency terminal 400, audio frequency output control module 104 can stop to boombox 500 output left channel digital audio signal and right channel digital audio signal, and the output channel of switching left channel digital audio signal and right channel digital audio signal is to audio frequency terminal 400, thereby realize audio frequency by external passive audio amplifier 600, plays.
The tv audio that Fig. 2 illustrates the embodiment of the present invention of knowing clearly to be provided is put the exemplary circuit structure of control circuit outward, for convenience of explanation, only shows part related to the present invention, and details are as follows:
As one embodiment of the present invention, supply module 101 comprises:
Magnetic bead FB, filter capacitor C1, capacitor C 2, resistance R 1 and resistance R 2;
The first end of magnetic bead FB is the input of supply module 101, the second end of magnetic bead FB and the positive pole of filter capacitor C1 are connected to the first end of capacitor C 2 altogether, the minus earth of filter capacitor C1, the first end of capacitor C 2 is the first output of supply module 101, the second end ground connection of capacitor C 2, the first end of the first termination capacitor C 2 of resistance R 1, the second end of resistance R 1 is the second output of supply module 101, resistance R 2 is connected between second end and ground of resistance R 1.In supply module 101, can suitably increase according to the actual requirements filter capacitor in parallel with filter capacitor C1, thereby reach the object of boostfiltering effect.
As one embodiment of the present invention, switching on and shutting down detection module 102 comprises:
Resistance R 3, resistance R 4, NPN type triode Q1, resistance R 5, positive-negative-positive triode Q2, resistance R 6, storage capacitor C3, diode D1, resistance R 7, diode D2 and storage capacitor C4;
The first end of resistance R 3 is the input of switching on and shutting down detection module 102, the second end of resistance R 3 and the first end of resistance R 4 are connected to the collector electrode of NPN type triode Q1 altogether, the second end ground connection of resistance R 4, the current collection of NPN type triode Q1 is the output of switching on and shutting down detection module 102 very, the grounded emitter of NPN type triode Q1, resistance R 5 is connected between the base stage of NPN type triode Q1 and the collector electrode of positive-negative-positive triode Q2, the negative electrode of the positive pole of storage capacitor C3 and diode D1 is connected to the emitter of positive-negative-positive triode Q2 altogether, the minus earth of storage capacitor C3, the base stage of the first termination positive-negative-positive triode Q2 of resistance R 6, the second end of resistance R 6, the anode of the first end of resistance R 7 and diode D2 is connected to the positive pole of storage capacitor C4 altogether, the minus earth of storage capacitor C4, the negative electrode of diode D2, the second end of resistance R 7 and the anode of diode D1 are connected to the first end of resistance R 3 altogether.
As one embodiment of the present invention, power amplifier module 103 comprises:
Power amplifier U1, capacitor C 5, capacitor C 6, capacitor C 7, capacitor C 8, capacitor C 9 and capacitor C 10;
The first analog power pin AVCC1 of power amplifier U1 is the power end of power amplifier module 103, the second analog power pin AVCC2 of power amplifier U1, the negative pin GAIN0 that selects of gain, the first L channel power supply H bridge pin PVCCL1, the first R channel power supply H bridge pin PVCCR1, the second L channel power supply H bridge pin PVCCL2 and the second R channel power supply H bridge pin PVCCR2 are connected to the first analog power pin AVCC1 altogether, the off signal pin SD of power amplifier U1 and quiet enable pin MUTE are switch control end and the quiet control end of power amplifier module 103, the first end of the first end of capacitor C 5 and capacitor C 6 respectively with L channel audio frequency input pin LIN and the right audio channel input pin RIN of power amplifier U1, the second end of capacitor C 5 and the second end of capacitor C 6 are respectively L channel audio input end and the right audio channel input of power amplifier module 103, capacitor C 7 is connected between the bypass strobe pin BYPASS and ground of power amplifier U1, capacitor C 8 is connected between the builtin voltage pin VCLAMP and ground of power amplifier U1, the first analogue ground pin AGND1 of power amplifier U1 and the second analogue ground pin AGND2 are connected to ground altogether, the first left passage power supply ground H bridge pin PGNDL1 of power amplifier U1, the second left passage power supply ground H bridge pin PGNL2, the first right passage power supply ground H bridge pin PGNDR1 and the equal ground connection of the second right passage power supply ground H bridge pin PGNR2, the L channel output pin LOUT of power amplifier U1 and R channel output pin ROUT are respectively left channel signals output and the right-channel signals output of power amplifier module 103, capacitor C 9 is connected between the L channel guiding input and output pin BSL and L channel output pin LOUT of power amplifier U1, capacitor C 10 is connected between the R channel guiding input and output pin BSR and R channel output pin ROUT of power amplifier U1, the gain key player on a team pin GAIN1 of power amplifier U1 and the equal ground connection of the 3rd analogue ground pin AGND3.Wherein, power amplifier U1 is that model is the power amplification chip of TPA3121.
As one embodiment of the present invention, audio frequency output control module 104 comprises:
Resistance R 8, capacitor C 11, bidirectional diode D3, capacitor C 12, inductance L 1, capacitor C 13, resistance R 9, PMOS manages Q3, NPN type triode Q4, resistance R 10, resistance R 11, resistance R 12, resistance R 13, storage capacitor C14, NPN type triode Q5, capacitor C 15, resistance R 14, positive-negative-positive triode Q6, resistance R 15, resistance R 16, resistance R 17, storage capacitor C16, resistance R 18, capacitor C 17, bidirectional diode D4, capacitor C 18, inductance L 2, capacitor C 19, resistance R 19, PMOS manages Q7, NPN type triode Q8, resistance R 20, resistance R 21, resistance R 22, resistance R 23, storage capacitor C20, NPN type triode Q9, capacitor C 21, resistance R 24, positive-negative-positive triode Q10, resistance R 25, resistance R 26, resistance R 27 and storage capacitor C22,
The first end of inductance L 1 is the right-channel signals input of audio frequency output control module 104, resistance R 8 is connected between the first end of inductance L 1 and the first end of capacitor C 11, the first pin 1 of the second termination bidirectional diode D3 of capacitor C 11, crus secunda 2 ground connection of bidirectional diode D3, the source electrode of the second termination PMOS pipe Q3 of inductance L 1, capacitor C 13 is connected between second end and ground of inductance L 1, resistance R 9 is connected between the grid and source electrode of PMOS pipe Q3, the collector electrode of NPN type triode Q4 connects the grid of PMOS pipe Q3, resistance R 10 is connected between the base stage and ground of NPN type triode Q4, the first end of the first end of resistance R 11 and capacitor C 12 is connected to the tripod 3 of bidirectional diode D3 altogether, the second end ground connection of capacitor C 12, the second end of resistance R 11, the collector electrode of the first end of resistance R 12 and NPN type triode Q5 is connected to the emitter of NPN type triode Q4 altogether, the second end ground connection of resistance R 12, the grounded emitter of NPN type triode Q5, the first end of the first end of capacitor C 15 and resistance R 14 is connected to the base stage of NPN type triode Q5 altogether, the second end ground connection of capacitor C 15, the second end of the collector electrode connecting resistance R14 of positive-negative-positive triode Q6, the emitter of the first end of resistance R 15 and positive-negative-positive triode Q6 connects the power end that forms audio frequency output control module 104 altogether, the second end of resistance R 15 and the first end of resistance R 16 are connected to the base stage of positive-negative-positive triode Q6 altogether, the second end of resistance R 16 is connected with the negative pole of storage capacitor C16, the positive pole of the first end of resistance R 13 and storage capacitor C14 is connected to the drain electrode of PMOS pipe Q3 altogether, the second end ground connection of resistance R 13, the negative pole of storage capacitor C14 is the internal output of the R channel of audio frequency output control module 104, the positive pole of the first end of resistance R 17 and storage capacitor C16 is connected to the source electrode of PMOS pipe Q3 altogether, the second end ground connection of resistance R 17, the negative pole of storage capacitor C16 is the external output of the R channel of audio frequency output control module 104, the first end of inductance L 2 is the left channel signals input of audio frequency output control module 104, resistance R 18 is connected between the first end of inductance L 2 and the first end of capacitor C 17, the first pin 1 of the second termination bidirectional diode D4 of capacitor C 17, crus secunda 2 ground connection of bidirectional diode D4, the source electrode of the second termination PMOS pipe Q7 of inductance L 2, capacitor C 19 is connected between second end and ground of inductance L 2, resistance R 19 is connected between the grid and source electrode of PMOS pipe Q7, the collector electrode of NPN type triode Q8 connects the grid of PMOS pipe Q7, resistance R 20 is connected between the base stage and ground of NPN type triode Q8, the first end of the first end of resistance R 21 and capacitor C 18 is connected to the tripod 3 of bidirectional diode D4 altogether, the second end ground connection of capacitor C 18, the second end of resistance R 21, the collector electrode of the first end of resistance R 22 and NPN type triode Q9 is connected to the emitter of NPN type triode Q8 altogether, the second end ground connection of resistance R 22, the grounded emitter of NPN type triode Q9, the first end of the first end of capacitor C 21 and resistance R 24 is connected to the base stage of NPN type triode Q9 altogether, the second end ground connection of capacitor C 21, the second end of the collector electrode connecting resistance R24 of positive-negative-positive triode Q10, the emitter of the first end of resistance R 25 and positive-negative-positive triode Q10 is connected to the first end of resistance R 15 altogether, the second end of resistance R 25 and the first end of resistance R 26 are connected to the base stage of positive-negative-positive triode Q10 altogether, the second end of resistance R 26 is connected with the negative pole of storage capacitor C22, the positive pole of the first end of resistance R 23 and storage capacitor C20 is connected to the drain electrode of PMOS pipe Q7 altogether, the second end ground connection of resistance R 23, the negative pole of storage capacitor C20 is the internal output of the L channel of audio frequency output control module 104, the positive pole of the first end of resistance R 27 and storage capacitor C22 is connected to the source electrode of PMOS pipe Q7 altogether, the second end ground connection of resistance R 27, the negative pole of storage capacitor C22 is the external output of the L channel of audio frequency output control module 104.Wherein, resistance R 8, capacitor C 11, bidirectional diode D3, capacitor C 12, inductance L 1, capacitor C 13, resistance R 9, PMOS manages Q3, NPN type triode Q4, resistance R 10, resistance R 11, resistance R 12, resistance R 13, capacitor C 14, NPN type triode Q5, capacitor C 15, resistance R 14, positive-negative-positive triode Q6, resistance R 15, resistance R 16, resistance R 17 and storage capacitor C16 form right audio channel output control circuit, resistance R 18, capacitor C 17, bidirectional diode D4, capacitor C 18, inductance L 2, capacitor C 19, resistance R 19, PMOS manages Q7, NPN type triode Q8, resistance R 20, resistance R 21, resistance R 22, resistance R 23, capacitor C 20, NPN type triode Q9, capacitor C 21, resistance R 24, positive-negative-positive triode Q10, resistance R 25, resistance R 26, resistance R 27 and storage capacitor C22 form L channel audio frequency output control circuit.
Below in conjunction with operation principle, above-mentioned tv audio being put to control circuit 100 is outward described further:
Magnetic bead FB in supply module 101 carries out filtering by the high-frequency signal in the direct current of power supply 200 outputs, and to be undertaken exporting a voltage A_VCC from the first end of capacitor C 2 after filtering energy storage by filter capacitor C1 and capacitor C 2 be power amplifier module 103 power supplies, through the bleeder circuit that is comprised of resistance R 1 and resistance R 2, A_VCC is carried out exporting a voltage C_VCC after dividing potential drop is that audio frequency output control module 104 is powered simultaneously.
Power amplifier U1 is low level and off signal pin SD while being high level at its quiet enable pin MUTE, and left channel analog audio signal, the right channel analog audio signal that just can export audio-frequency signal processing module 300 are amplified processing; When the quiet enable pin MUTE of power amplifier U1 is high level or off signal pin SD while being low level, it stops exporting left channel digital audio signal and right channel digital audio signal.When television set exchanges start, the voltage A_VCC that supply module 101 is exported can charge rapidly to storage capacitor C3 by diode D1, and then make the cathode voltage of storage capacitor C3 be increased to rapidly the magnitude of voltage identical with A_VCC, and now because diode D2 oppositely ends, voltage A_VCC can only slowly charge to storage capacitor C4 by resistance R 7, in slow charging process, the cathode voltage value of storage capacitor C4 is far below the magnitude of voltage of A_VCC, meanwhile, the base potential of the anode potential of diode D2 and PNP triode Q2 is basic identical, the emitter current potential of PNP triode Q2 is higher than base potential, so, PNP triode Q2 saturation conduction, and its collector electrode can make the quick saturation conduction of NPN triode Q1 by resistance R 5 by output driving current, NPN triode Q1 just can draw electric current from the second end of resistance R 3, and then its collector potential is reduced, thereby output one low level is to the off signal pin SD of power amplifier U1, make power amplifier U1 stop exporting left channel digital audio signal and right channel digital audio signal.At storage capacitor, C4 slowly charges, and before the base voltage of PNP triode Q2 rises to voltage A_VCC, can effectively avoid boombox or external passive audio amplifier when television set exchanges start, to send rush of current sound.When storage capacitor C4 charges to voltage A_VCC, the base stage of PNP triode Q2 is identical with the magnitude of voltage of the current potential of emitter and voltage A_VCC, so, PNP triode Q2 cut-off, now no current is by resistance R 5 driving N PN triode Q1 conductings, so NPN triode Q1 cut-off, the current collection that voltage A_VCC makes NPN triode Q1 after by resistance R 3 and resistance R 64 dividing potential drops is high potential very, thereby output one high level, to the off signal pin SD of power amplifier U1, makes power amplifier U1 only be subject to the control of its quiet enable pin MUTE.
When television set ac dump, the magnitude of voltage of the voltage A_VCC that supply module 101 is exported declines rapidly, diode D2 saturation conduction, storage capacitor C4 is by diode D2 repid discharge, and because diode D1 now oppositely ends, the emitter voltage of PNP triode Q2 is higher than base voltage, so PNP triode Q2 saturation conduction, the collector electrode output driving current of PNP triode Q2 makes the quick saturation conduction of NPN triode Q1 by resistance R 5, NPN triode Q1 just can draw electric current from the second end of resistance R 3, and then its collector potential is reduced, thereby output one low level is to the off signal pin SD of power amplifier U1, make power amplifier U1 stop exporting left channel digital audio signal and right channel digital audio signal.Power amplifier U1 maintains this operating state until storage capacitor C4 discharge off, thereby can effectively avoid boombox or external passive audio amplifier when television set ac dump, to send rush of current sound.
As shown in the above, when television set exchanges start, voltage A_VCC charges to storage capacitor C4 by resistance R 7, and voltage A_VCC charges to storage capacitor C4 by emitter junction and the resistance R 6 of PNP triode Q2 simultaneously; And when television set ac dump, storage capacitor C3 discharges by emitter junction, resistance R 6 and the diode D2 of PNP triode Q2.Hence one can see that, when television set exchanges start or ac dump, the big or small collector electrode that can affect NPN type triode Q1 of resistance of resistance R 6 maintains the time of low level output, so, according to different actual demands, user can select the resistance R 6 (more than generally resistance can being chosen in to 1K ohm) of different resistances to avoid boombox 500 or external passive audio amplifier 600 to send rush of current sound to reach when television set exchanges start or shutdown.
In addition, when fluctuation appears in voltage A_VCC, due to the pressure stabilization function of storage capacitor C3 and storage capacitor C4, the base stage of PNP triode Q2 and the voltage difference of emitter remain unchanged substantially, thereby avoid the Q2 conducting of PNP triode and produce misoperation.
For audio frequency output control module 104, because right audio channel output control circuit is identical with the structure of L channel audio frequency output control circuit, below only the operation principle of right audio channel output control circuit is described:
(its high level voltage value is A_VCC to the right channel digital audio signal LO_R that inductance L 1 and capacitor C 13 composition filter networks are exported the R channel output pin ROUT of power amplifier U1, low level voltage value is 0V) middle carrier signal filtering is to obtain R channel analogue audio frequency large-signal LO_R1, and magnitude of voltage and negative peak that its positive peak is no more than A_VCC are not less than 0V.LO_R1 is undertaken exporting right audio channel AC signal LO_RA (peak value is no more than half of A_VCC magnitude of voltage) to audio frequency terminal 400 after DC-isolation by storage capacitor C8.
Resistance R 8, capacitor C 11, bidirectional diode D3 and capacitor C 12 form circuit for generating negative voltage.When LO_R is high level, conducting between the first pin 1 of bidirectional diode D3 and crus secunda 2, the voltage of the 1st pin 1 of bidirectional diode D3 is 0V (conduction voltage drop of now ignoring bidirectional diode D3) by clamper, first pin 1 of LO_R by resistance R 8, capacitor C 11 and crus secunda 2 are to capacitor C 11 quick charges, so the pressure drop at the two ends of capacitor C 11 is A_VCC; When LO_R is low level (0V), because the pressure drop at the two ends of capacitor C 11 can not instantaneous saltus step, the 1st pin of bidirectional diode D3 is-A_VCC, conducting between the first pin 1 of bidirectional diode D3 and tripod 3, capacitor C 12 by quick charge to-A_VCC; When LO_R is high level again, the voltage of the 1st pin 1 of bidirectional diode D3 is 0V by clamper again, and the 3rd pin of bidirectional diode D3 is-A_VCC, then cut-off between the first pin 1 of bidirectional diode D3 and tripod 3, be maintained-A_VCC of the voltage of capacitor C 12.Follow-uply will constantly repeat said process, the be maintained-A_VCC of voltage VM of the first end of resistance R 11.
Resistance R 14, capacitor C 15, NPN type triode Q6, resistance R 15 and resistance R 16 composition control signal generating circuits.When external passive audio amplifier 500 is not during accessing to audio terminal 400, the 4th pin 4 of audio frequency terminal 400 is unsettled, and NPN type triode Q6 cut-off and its current collection electronegative potential very, can not make NPN type triode Q5 conducting; When external passive audio amplifier 600 accessing to audio terminal 400, the 4th pin 4 of audio frequency terminal 400 does not have unsettled, the base stage of NPN type triode Q6 obtains bias voltage, and C_VCC passes through after resistance R 15 and resistance R 16 dividing potential drops, enter the collector electrode of NPN type triode Q6, thereby make NPN type triode Q6 saturation conduction, and from its collector electrode output high level driving N PN type triode Q5 conducting work.The level signal that the collector electrode of 15 couples of NPN type triode Q6 of resistance R 14 and capacitor C is exported is carried out low-pass filtering to be provided wrong level signal and causes misoperation to NPN type triode Q5 preventing.
PMOS pipe Q3, resistance R 9, NPN type triode Q4, resistance R 10, resistance R 11, resistance R 12 and NPN type triode Q5 composition control circuit.When the collector electrode output low level of NPN type triode Q6, NPN type triode Q5 cut-off, from VM by R9 and R10 dividing potential drop, make the emitter voltage of triode Q3 be
(
), its magnitude of voltage will be much smaller than 0V, and the base stage of NPN type triode Q4 is connected to ground by resistance R 10, NPN type triode Q4 saturation conduction, and collector voltage and the emitter voltage of NPN type triode Q4 are basic identical, for
the source electrode of PMOS pipe Q3 is R channel analogue audio frequency large-signal LO_R1, and its amplitude is between the magnitude of voltage of 0V to A_VCC, and the gate voltage values of PMOS pipe Q3 is
it is poor that the source electrode of PMOS pipe Q3 and the voltage difference between grid are greater than its saturation conduction threshold voltage, so PMOS pipe Q3 saturation conduction, LO_R1 is managed and through storage capacitor C14, is carried out exporting R channel AC analogue large-signal LO_RB after straight coupling after Q3 and drive the right horn of boombox 500 to sound by PMOS.When the collector electrode of NPN type triode Q6 is exported high level, NPN type triode Q5 saturation conduction, the emitter voltage of NPN type triode Q4 by NPN type triode Q5 be clamped to (magnitude of voltage is 0V), the base stage of NPN type triode Q4 is connected to ground by resistance R 10, so its base voltage value is also 0V, now NPN type triode Q4 cut-off, the source voltage values of PMOS pipe Q3 is identical with gate voltage values, so PMOS pipe Q3 cut-off, LO_R1 can not manage Q3 by PMOS, LO_RB can not drive the right horn of boombox 500 to sound, storage capacitor C14 discharges to ground by resistance R 13 until its inner electric weight all discharges complete so, with prevent PMOS pipe Q3 again conducting and moment generation current impulsive sound, while LO_R1 carries out exporting right audio channel AC signal LO_RA after straight coupling by storage capacitor C16 makes external passive audio amplifier 600 audio plays.Because L channel audio frequency output control circuit is identical (as shown in Figure 2 with the operation principle of right audio channel output control circuit, left channel digital audio signal is LO_L, L channel analogue audio frequency large-signal is LO_L1, L channel audible communication signal is LO_LA, L channel AC analogue large-signal is LO_LB), therefore repeat no more.
Another object of the present invention is also to provide a kind of television set, this television set comprises that tv audio is put control circuit 100, power supply 200, audio-frequency signal processing module 300, audio frequency terminal 400 outward and boombox 500 connects, audio-frequency signal processing module 300 output left channel analog audio signal, right channel analog audio signal and quiet control signals, audio frequency terminal 400 connects external passive audio amplifier 600, and tv audio is put control circuit 100 outward and comprised:
Supply module 101, switching on and shutting down detection module 102, power amplifier module 103 and audio frequency output control module 104;
The input of supply module 101, the first output and the second output are connected with the power end of the output of power supply 200, the power end of power amplifier module 103 and audio frequency output control module 104 respectively, supply module 101, for the direct current of power supply 200 outputs being carried out after high-frequency signal filtering and filtering processing, is power amplifier module 103 and 104 power supplies of audio frequency output control module;
The input of switching on and shutting down detection module 102 is connected with the first output of supply module 101 and the switch control end of power amplifier module 103 respectively with output, and switching on and shutting down detection module 102 is for exporting corresponding control level signal according to the change in voltage of the first output of supply module 101;
The quiet control end of power amplifier module 103, L channel audio input end and right audio channel input respectively with the quiet control signal output MUTE of audio-frequency signal processing module 300, L channel audio output LA and right audio channel output RA are connected, when the quiet control signal that power amplifier module 103 is high level and audio-frequency signal processing module 300 outputs for the control level signal when 102 outputs of switching on and shutting down detection module is low level, the left channel analog audio signal of audio-frequency signal processing module 300 outputs and right channel analog audio signal are changed and amplified and process rear left channel digital audio signal and the right channel digital audio signal of generating,
The left channel signals input of audio frequency output control module 104 is connected with right-channel signals output with the left channel signals output of power amplifier module 103 respectively with right-channel signals input, the external output of L channel and the external output of R channel connect respectively the first pin 1 and the 4th pin 4 ends of audio frequency terminal 400, the internal output of L channel and the internal output of R channel meet respectively left channel signals end L and the right-channel signals end R of boombox 500, audio frequency output control module 104 carries out output channel switching controls for the left channel digital audio signal and the right channel digital audio signal that between audio frequency terminal 400 and boombox 500, power amplifier module 103 are generated.
In embodiments of the present invention, by employing, comprise supply module 101, switching on and shutting down detection module 102, the tv audio of power amplifier module 103 and audio frequency output control module 104 is put control circuit 100 outward, can be according to the operating state of the change in voltage power ratio control amplification module 103 of supply module 101 to prevent when the TV power on and off to boombox 500 or external passive audio amplifier 600 output current impulsive sounds, simultaneously can to left and right acoustic channels digital audio and video signals, carry out the phenomenon that interference appears mixing when avoiding audio frequency to play in output channel switching according to the access state of external passive audio amplifier 600, it is simple in structure that whole tv audio is put control circuit outward, cost is low and power consumption is little, thereby having solved the existing audio frequency of prior art, to put definition outward low, the problem that cost is high and power consumption is large.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a tv audio is put control circuit outward, be connected with power supply, audio-frequency signal processing module, audio frequency terminal and the boombox of television set, described audio-frequency signal processing module output left channel analog audio signal, right channel analog audio signal and quiet control signal, described audio frequency terminal connects external passive audio amplifier, it is characterized in that, described tv audio is put control circuit outward and is comprised:
Supply module, switching on and shutting down detection module, power amplifier module and audio frequency output control module;
The input of described supply module, the first output and the second output respectively with the output of described power supply, the power end of the power end of described power amplifier module and described audio frequency output control module be connected, described supply module, for the direct current of described power supply output being carried out after high-frequency signal filtering and filtering processing, is described power amplifier module and the power supply of described audio frequency output control module;
The input of described switching on and shutting down detection module is connected with the first output of described supply module and the switch control end of described power amplifier module respectively with output, and described switching on and shutting down detection module is for exporting corresponding control level signal according to the change in voltage of the first output of described supply module;
The quiet control end of described power amplifier module, L channel audio input end and right audio channel input are connected with quiet control signal output, L channel audio output and the right audio channel output of described audio-frequency signal processing module respectively, described power amplifier module is for when described control level signal being high level and described quiet control signal while being low level, to described left channel analog audio signal and described right channel analog audio signal change and amplify process after generation left channel digital audio signal and right channel digital audio signal;
The left channel signals input of described audio frequency output control module is connected with right-channel signals output with the left channel signals output of described power amplifier module respectively with right-channel signals input, the external output of L channel and the external output of R channel connect respectively the first pin and the 4th pin of described audio frequency terminal, the internal output of L channel and the internal output of R channel connect respectively left channel signals end and the right-channel signals end of described boombox, described audio frequency output control module for carrying out output channel switching controls to described left channel digital audio signal and described right channel digital audio signal between described audio frequency terminal and described boombox.
2. tv audio as claimed in claim 1 is put control circuit outward, it is characterized in that, described supply module comprises:
Magnetic bead, filter capacitor C1, capacitor C 2, resistance R 1 and resistance R 2;
The first end of described magnetic bead is the input of described supply module, the second end of described magnetic bead and the positive pole of described filter capacitor C1 are connected to the first end of described capacitor C 2 altogether, the minus earth of described filter capacitor C1, the first end of described capacitor C 2 is the first output of described supply module, the second end ground connection of described capacitor C 2, the first end of capacitor C 2 described in the first termination of described resistance R 1, the second output that the second end of described resistance R 1 is described supply module, described resistance R 2 is connected between second end and ground of described resistance R 1.
3. tv audio as claimed in claim 1 is put control circuit outward, it is characterized in that, described switching on and shutting down detection module comprises:
Resistance R 3, resistance R 4, NPN type triode Q1, resistance R 5, positive-negative-positive triode Q2, resistance R 6, storage capacitor C3, diode D1, resistance R 7, diode D2 and storage capacitor C4;
The first end of described resistance R 3 is the input of described switching on and shutting down detection module, the second end of described resistance R 3 and the first end of described resistance R 4 are connected to the collector electrode of described NPN type triode Q1 altogether, the second end ground connection of described resistance R 4, the output of the very described switching on and shutting down detection module of current collection of described NPN type triode Q1, the grounded emitter of described NPN type triode Q1, described resistance R 5 is connected between the base stage of described NPN type triode Q1 and the collector electrode of described positive-negative-positive triode Q2, the negative electrode of the positive pole of described storage capacitor C3 and described diode D1 is connected to the emitter of described positive-negative-positive triode Q2 altogether, the minus earth of described storage capacitor C3, the base stage of positive-negative-positive triode Q2 described in the first termination of described resistance R 6, the second end of described resistance R 6, the anode of the first end of described resistance R 7 and described diode D2 is connected to the positive pole of described storage capacitor C4 altogether, the minus earth of described storage capacitor C4, the negative electrode of described diode D2, the second end of described resistance R 7 and the anode of described diode D1 are connected to the first end of described resistance R 3 altogether.
4. tv audio as claimed in claim 1 is put control circuit outward, it is characterized in that, described power amplifier module comprises:
Power amplifier, capacitor C 5, capacitor C 6, capacitor C 7, capacitor C 8, capacitor C 9 and capacitor C 10;
The power end that the first analog power pin of described power amplifier is described power amplifier module, the second analog power pin of described power amplifier, the negative pin that selects of gain, the first L channel power supply H bridge pin, the first R channel power supply H bridge pin, the second L channel power supply H bridge pin and the second R channel power supply H bridge pin are connected to the first analog power pin altogether, the switch control end that the off signal pin of described power amplifier and quiet enable pin are described power amplifier module and quiet control end, the first end of the first end of described capacitor C 5 and described capacitor C 6 respectively with L channel audio frequency input pin and the right audio channel input pin of described power amplifier, the second end of described capacitor C 5 and the second end of described capacitor C 6 are respectively L channel audio input end and the right audio channel input of described power amplifier module, described capacitor C 7 is connected between the bypass strobe pin and ground of described power amplifier, described capacitor C 8 is connected between the builtin voltage pin and ground of described power amplifier, the first analogue ground pin of described power amplifier and the second analogue ground pin are connected to ground altogether, the first left passage power supply ground H bridge pin of described power amplifier U1, the second left passage power supply ground H bridge pin, the first right passage power supply ground H bridge pin and the equal ground connection of the second right passage power supply ground H bridge pin, the L channel output pin of described power amplifier U1 and R channel output pin are respectively left channel signals output and the right-channel signals output of described power amplifier module, described capacitor C 9 is connected between the L channel guiding input and output pin and L channel output pin of described power amplifier, described capacitor C 10 is connected between the R channel guiding input and output pin and R channel output pin of described power amplifier, the gain key player on a team pin of described power amplifier and the equal ground connection of the 3rd analogue ground pin.
5. tv audio as claimed in claim 1 is put control circuit outward, it is characterized in that, described audio frequency output control module comprises:
Resistance R 8, capacitor C 11, bidirectional diode D3, capacitor C 12, inductance L 1, capacitor C 13, resistance R 9, PMOS manages Q3, NPN type triode Q4, resistance R 10, resistance R 11, resistance R 12, resistance R 13, storage capacitor C14, NPN type triode Q5, capacitor C 15, resistance R 14, positive-negative-positive triode Q6, resistance R 15, resistance R 16, resistance R 17, storage capacitor C16, resistance R 18, capacitor C 17, bidirectional diode D4, capacitor C 18, inductance L 2, capacitor C 19, resistance R 19, PMOS manages Q7, NPN type triode Q8, resistance R 20, resistance R 21, resistance R 22, resistance R 23, storage capacitor C20, NPN type triode Q9, capacitor C 21, resistance R 24, positive-negative-positive triode Q10, resistance R 25, resistance R 26, resistance R 27 and storage capacitor C22,
The first end of described inductance L 1 is the right-channel signals input of described audio frequency output control module, described resistance R 8 is connected between the first end of described inductance L 1 and the first end of described capacitor C 11, the first pin of bidirectional diode D3 described in the second termination of described capacitor C 11, the crus secunda ground connection of described bidirectional diode D3, the source electrode of PMOS pipe Q3 described in the second termination of described inductance L 1, in fact capacitor C 13 is connected between second end and ground of described inductance L 1, described resistance R 9 is connected between the grid and source electrode of described PMOS pipe Q3, the collector electrode of described NPN type triode Q4 connects the grid of described PMOS pipe Q3, described resistance R 10 is connected between the base stage and ground of described NPN type triode Q4, the first end of the first end of described resistance R 11 and described capacitor C 12 is connected to the tripod of described bidirectional diode D3 altogether, the second end ground connection of described capacitor C 12, the second end of described resistance R 11, the collector electrode of the first end of described resistance R 12 and described NPN type triode Q5 is connected to the emitter of described NPN type triode Q4 altogether, the second end ground connection of described resistance R 12, the grounded emitter of described NPN type triode Q5, the first end of the first end of described capacitor C 15 and described resistance R 14 is connected to the base stage of described NPN type triode Q5 altogether, the second end ground connection of described capacitor C 15, the collector electrode of described positive-negative-positive triode Q6 connects the second end of described resistance R 14, the emitter of the first end of described resistance R 15 and described positive-negative-positive triode Q6 connects the power end that forms described audio frequency output control module altogether, the second end of described resistance R 15 and the first end of described resistance R 16 are connected to the base stage of described positive-negative-positive triode Q6 altogether, the second end of described resistance R 16 is connected with the negative pole of described storage capacitor C16, the positive pole of the first end of described resistance R 13 and described storage capacitor C14 is connected to the drain electrode of described PMOS pipe Q3 altogether, the second end ground connection of described resistance R 13, the negative pole of described storage capacitor C14 is the internal output of the R channel of described audio frequency output control module, the positive pole of the first end of described resistance R 17 and described storage capacitor C16 is connected to the source electrode of described PMOS pipe Q3 altogether, the second end ground connection of described resistance R 17, the negative pole of described storage capacitor C16 is the external output of the R channel of described audio frequency output control module, the first end of described inductance L 2 is the left channel signals input of described audio frequency output control module, described resistance R 18 is connected between the first end of described inductance L 2 and the first end of described capacitor C 17, the first pin of bidirectional diode D4 described in the second termination of described capacitor C 17, the crus secunda ground connection of described bidirectional diode D4, the source electrode of PMOS pipe Q7 described in the second termination of described inductance L 2, described capacitor C 19 is connected between second end and ground of described inductance L 2, described resistance R 19 is connected between the grid and source electrode of described PMOS pipe Q7, the collector electrode of described NPN type triode Q8 connects the grid of described PMOS pipe Q7, described resistance R 20 is connected between the base stage and ground of described NPN type triode Q8, the first end of the first end of described resistance R 21 and described capacitor C 18 is connected to the tripod of described bidirectional diode D4 altogether, the second end ground connection of described capacitor C 18, the second end of described resistance R 21, the collector electrode of the first end of described resistance R 22 and described NPN type triode Q9 is connected to the emitter of described NPN type triode Q8 altogether, the second end ground connection of described resistance R 22, the grounded emitter of described NPN type triode Q9, the first end of the first end of described capacitor C 21 and described resistance R 24 is connected to the base stage of described NPN type triode Q9 altogether, the second end ground connection of described capacitor C 21, the collector electrode of described positive-negative-positive triode Q10 connects the second end of described resistance R 24, the emitter of the first end of described resistance R 25 and described positive-negative-positive triode Q10 is connected to the first end of described resistance R 15 altogether, the second end of described resistance R 25 and the first end of described resistance R 26 are connected to the base stage of described positive-negative-positive triode Q10 altogether, the second end of described resistance R 26 is connected with the negative pole of described storage capacitor C22, the positive pole of the first end of described resistance R 23 and described storage capacitor C20 is connected to the drain electrode of described PMOS pipe Q7 altogether, the second end ground connection of described resistance R 23, the negative pole of described storage capacitor C20 is the internal output of the L channel of described audio frequency output control module, the positive pole of the first end of described resistance R 27 and described storage capacitor C22 is connected to the source electrode of described PMOS pipe Q7 altogether, the second end ground connection of described resistance R 27, the negative pole of described storage capacitor C22 is the external output of the L channel of described audio frequency output control module.
6. a television set, it is characterized in that, described television set comprises that tv audio is put control circuit, power supply, audio-frequency signal processing module, audio frequency terminal outward and boombox connects, described audio-frequency signal processing module output left channel analog audio signal, right channel analog audio signal and quiet control signal, described audio frequency terminal connects external passive audio amplifier, and described tv audio is put control circuit outward and comprised:
Supply module, switching on and shutting down detection module, power amplifier module and audio frequency output control module;
The input of described supply module, the first output and the second output respectively with the output of described power supply, the power end of the power end of described power amplifier module and described audio frequency output control module be connected, described supply module, for the direct current of described power supply output being carried out after high-frequency signal filtering and filtering processing, is described power amplifier module and the power supply of described audio frequency output control module;
The input of described switching on and shutting down detection module is connected with the first output of described supply module and the switch control end of described power amplifier module respectively with output, and described switching on and shutting down detection module is for exporting corresponding control level signal according to the change in voltage of the first output of described supply module;
The quiet control end of described power amplifier module, L channel audio input end and right audio channel input are connected with quiet control signal output, L channel audio output and the right audio channel output of described audio-frequency signal processing module respectively, described power amplifier module is for when described control level signal being high level and described quiet control signal while being low level, to described left channel analog audio signal and described right channel analog audio signal change and amplify process after generation left channel digital audio signal and right channel digital audio signal;
The left channel signals input of described audio frequency output control module is connected with right-channel signals output with the left channel signals output of described power amplifier module respectively with right-channel signals input, the external output of L channel and the external output of R channel connect respectively the first pin and the 4th pin of described audio frequency terminal, the internal output of L channel and the internal output of R channel connect respectively left channel signals end and the right-channel signals end of described boombox, described audio frequency output control module for carrying out output channel switching controls to described left channel digital audio signal and described right channel digital audio signal between described audio frequency terminal and described boombox.
7. television set as claimed in claim 6, is characterized in that, described supply module comprises:
Magnetic bead, filter capacitor C1, capacitor C 2, resistance R 1 and resistance R 2;
The first end of described magnetic bead is the input of described supply module, the second end of described magnetic bead and the positive pole of described filter capacitor C1 are connected to the first end of described capacitor C 2 altogether, the minus earth of described filter capacitor C1, the first end of described capacitor C 2 is the first output of described supply module, the second end ground connection of described capacitor C 2, the first end of capacitor C 2 described in the first termination of described resistance R 1, the second output that the second end of described resistance R 1 is described supply module, described resistance R 2 is connected between second end and ground of described resistance R 1.
8. television set as claimed in claim 6, is characterized in that, described switching on and shutting down detection module comprises:
Resistance R 3, resistance R 4, NPN type triode Q1, resistance R 5, positive-negative-positive triode Q2, resistance R 6, storage capacitor C3, diode D1, resistance R 7, diode D2 and storage capacitor C4;
The first end of described resistance R 3 is the input of described switching on and shutting down detection module, the second end of described resistance R 3 and the first end of described resistance R 4 are connected to the collector electrode of described NPN type triode Q1 altogether, the second end ground connection of described resistance R 4, the output of the very described switching on and shutting down detection module of current collection of described NPN type triode Q1, the grounded emitter of described NPN type triode Q1, described resistance R 5 is connected between the base stage of described NPN type triode Q1 and the collector electrode of described positive-negative-positive triode Q2, the negative electrode of the positive pole of described storage capacitor C3 and described diode D1 is connected to the emitter of described positive-negative-positive triode Q2 altogether, the minus earth of described storage capacitor C3, the base stage of positive-negative-positive triode Q2 described in the first termination of described resistance R 6, the second end of described resistance R 6, the anode of the first end of described resistance R 7 and described diode D2 is connected to the positive pole of described storage capacitor C4 altogether, the minus earth of described storage capacitor C4, the negative electrode of described diode D2, the second end of described resistance R 7 and the anode of described diode D1 are connected to the first end of described resistance R 3 altogether.
9. television set as claimed in claim 6, is characterized in that, described power amplifier module comprises:
Power amplifier, capacitor C 5, capacitor C 6, capacitor C 7, capacitor C 8, capacitor C 9 and capacitor C 10;
The power end that the first analog power pin of described power amplifier is described power amplifier module, the second analog power pin of described power amplifier, the negative pin that selects of gain, the first L channel power supply H bridge pin, the first R channel power supply H bridge pin, the second L channel power supply H bridge pin and the second R channel power supply H bridge pin are connected to the first analog power pin altogether, the switch control end that the off signal pin of described power amplifier and quiet enable pin are described power amplifier module and quiet control end, the first end of the first end of described capacitor C 5 and described capacitor C 6 respectively with L channel audio frequency input pin and the right audio channel input pin of described power amplifier, the second end of described capacitor C 5 and the second end of described capacitor C 6 are respectively L channel audio input end and the right audio channel input of described power amplifier module, described capacitor C 7 is connected between the bypass strobe pin and ground of described power amplifier, described capacitor C 8 is connected between the builtin voltage pin and ground of described power amplifier, the first analogue ground pin of described power amplifier and the second analogue ground pin are connected to ground altogether, the first left passage power supply ground H bridge pin of described power amplifier U1, the second left passage power supply ground H bridge pin, the first right passage power supply ground H bridge pin and the equal ground connection of the second right passage power supply ground H bridge pin, the L channel output pin of described power amplifier U1 and R channel output pin are respectively left channel signals output and the right-channel signals output of described power amplifier module, described capacitor C 9 is connected between the L channel guiding input and output pin and L channel output pin of described power amplifier, described capacitor C 10 is connected between the R channel guiding input and output pin and R channel output pin of described power amplifier, the gain key player on a team pin of described power amplifier and the equal ground connection of the 3rd analogue ground pin.
10. television set as claimed in claim 6, is characterized in that, described audio frequency output control module comprises:
Resistance R 8, capacitor C 11, bidirectional diode D3, capacitor C 12, inductance L 1, capacitor C 13, resistance R 9, PMOS manages Q3, NPN type triode Q4, resistance R 10, resistance R 11, resistance R 12, resistance R 13, storage capacitor C14, NPN type triode Q5, capacitor C 15, resistance R 14, positive-negative-positive triode Q6, resistance R 15, resistance R 16, resistance R 17, storage capacitor C16, resistance R 18, capacitor C 17, bidirectional diode D4, capacitor C 18, inductance L 2, capacitor C 19, resistance R 19, PMOS manages Q7, NPN type triode Q8, resistance R 20, resistance R 21, resistance R 22, resistance R 23, storage capacitor C20, NPN type triode Q9, capacitor C 21, resistance R 24, positive-negative-positive triode Q10, resistance R 25, resistance R 26, resistance R 27 and storage capacitor C22,
The first end of described inductance L 1 is the right-channel signals input of described audio frequency output control module, described resistance R 8 is connected between the first end of described inductance L 1 and the first end of described capacitor C 11, the first pin of bidirectional diode D3 described in the second termination of described capacitor C 11, the crus secunda ground connection of described bidirectional diode D3, the source electrode of PMOS pipe Q3 described in the second termination of described inductance L 1, in fact capacitor C 13 is connected between second end and ground of described inductance L 1, described resistance R 9 is connected between the grid and source electrode of described PMOS pipe Q3, the collector electrode of described NPN type triode Q4 connects the grid of described PMOS pipe Q3, described resistance R 10 is connected between the base stage and ground of described NPN type triode Q4, the first end of the first end of described resistance R 11 and described capacitor C 12 is connected to the tripod of described bidirectional diode D3 altogether, the second end ground connection of described capacitor C 12, the second end of described resistance R 11, the collector electrode of the first end of described resistance R 12 and described NPN type triode Q5 is connected to the emitter of described NPN type triode Q4 altogether, the second end ground connection of described resistance R 12, the grounded emitter of described NPN type triode Q5, the first end of the first end of described capacitor C 15 and described resistance R 14 is connected to the base stage of described NPN type triode Q5 altogether, the second end ground connection of described capacitor C 15, the collector electrode of described positive-negative-positive triode Q6 connects the second end of described resistance R 14, the emitter of the first end of described resistance R 15 and described positive-negative-positive triode Q6 connects the power end that forms described audio frequency output control module altogether, the second end of described resistance R 15 and the first end of described resistance R 16 are connected to the base stage of described positive-negative-positive triode Q6 altogether, the second end of described resistance R 16 is connected with the negative pole of described storage capacitor C16, the positive pole of the first end of described resistance R 13 and described storage capacitor C14 is connected to the drain electrode of described PMOS pipe Q3 altogether, the second end ground connection of described resistance R 13, the negative pole of described storage capacitor C14 is the internal output of the R channel of described audio frequency output control module, the positive pole of the first end of described resistance R 17 and described storage capacitor C16 is connected to the source electrode of described PMOS pipe Q3 altogether, the second end ground connection of described resistance R 17, the negative pole of described storage capacitor C16 is the external output of the R channel of described audio frequency output control module, the first end of described inductance L 2 is the left channel signals input of described audio frequency output control module, described resistance R 18 is connected between the first end of described inductance L 2 and the first end of described capacitor C 17, the first pin of bidirectional diode D4 described in the second termination of described capacitor C 17, the crus secunda ground connection of described bidirectional diode D4, the source electrode of PMOS pipe Q7 described in the second termination of described inductance L 2, described capacitor C 19 is connected between second end and ground of described inductance L 2, described resistance R 19 is connected between the grid and source electrode of described PMOS pipe Q7, the collector electrode of described NPN type triode Q8 connects the grid of described PMOS pipe Q7, described resistance R 20 is connected between the base stage and ground of described NPN type triode Q8, the first end of the first end of described resistance R 21 and described capacitor C 18 is connected to the tripod of described bidirectional diode D4 altogether, the second end ground connection of described capacitor C 18, the second end of described resistance R 21, the collector electrode of the first end of described resistance R 22 and described NPN type triode Q9 is connected to the emitter of described NPN type triode Q8 altogether, the second end ground connection of described resistance R 22, the grounded emitter of described NPN type triode Q9, the first end of the first end of described capacitor C 21 and described resistance R 24 is connected to the base stage of described NPN type triode Q9 altogether, the second end ground connection of described capacitor C 21, the collector electrode of described positive-negative-positive triode Q10 connects the second end of described resistance R 24, the emitter of the first end of described resistance R 25 and described positive-negative-positive triode Q10 is connected to the first end of described resistance R 15 altogether, the second end of described resistance R 25 and the first end of described resistance R 26 are connected to the base stage of described positive-negative-positive triode Q10 altogether, the second end of described resistance R 26 is connected with the negative pole of described storage capacitor C22, the positive pole of the first end of described resistance R 23 and described storage capacitor C20 is connected to the drain electrode of described PMOS pipe Q7 altogether, the second end ground connection of described resistance R 23, the negative pole of described storage capacitor C20 is the internal output of the L channel of described audio frequency output control module, the positive pole of the first end of described resistance R 27 and described storage capacitor C22 is connected to the source electrode of described PMOS pipe Q7 altogether, the second end ground connection of described resistance R 27, the negative pole of described storage capacitor C22 is the external output of the L channel of described audio frequency output control module.
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| CN201210207218.5A CN102769729B (en) | 2012-06-21 | 2012-06-21 | Television and audio external play control circuit thereof |
| HK13101496.2A HK1174174A1 (en) | 2012-06-21 | 2013-02-04 | Television and audio external play control circuit thereof |
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| CN201210207218.5A CN102769729B (en) | 2012-06-21 | 2012-06-21 | Television and audio external play control circuit thereof |
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| CN102769729B true CN102769729B (en) | 2014-08-13 |
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| CN106303801A (en) * | 2016-09-22 | 2017-01-04 | 捷开通讯(深圳)有限公司 | Circumscribed loudspeaking component and audio frequency apparatus |
| CN106454618B (en) * | 2016-09-28 | 2020-06-26 | 深圳市冠旭电子股份有限公司 | External charging current detection circuit of sound box and sound box |
| CN107995564B (en) * | 2018-01-25 | 2023-08-08 | 东莞市源康电子有限公司 | Audio amplifying circuit powered by positive and negative dual power supplies |
| CN108391203B (en) * | 2018-02-27 | 2021-08-24 | Tcl通力电子（惠州）有限公司 | Audio playing control method and device, audio playing equipment and system |
| CN108200518B (en) * | 2018-03-07 | 2024-04-12 | 合肥惠科金扬科技有限公司 | Audio circuit and audio equipment for eliminating instant noise during power-on |
| CN114296538A (en) * | 2021-12-07 | 2022-04-08 | 广东虹勤通讯技术有限公司 | Electronic equipment power amplifier power supply control circuit and electronic equipment |
| CN114567848B (en) * | 2022-01-26 | 2024-05-07 | 惠州华阳通用电子有限公司 | Audio output channel state detection device and method |
| CN116996813B (en) * | 2023-09-27 | 2024-01-26 | 深圳市立平科技有限公司 | Analog audio input amplitude limiting circuit for sound equipment |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101924970A (en) * | 2010-06-04 | 2010-12-22 | 深圳创维－Rgb电子有限公司 | Circuit for eliminating earphone plosion of liquid crystal display television |
| CN201726364U (en) * | 2010-02-12 | 2011-01-26 | 上海楷锐音响设备有限公司 | Audio power amplifier with audio signal control switch |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5223813B2 (en) * | 2009-08-10 | 2013-06-26 | ヤマハ株式会社 | Electronics |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201726364U (en) * | 2010-02-12 | 2011-01-26 | 上海楷锐音响设备有限公司 | Audio power amplifier with audio signal control switch |
| CN101924970A (en) * | 2010-06-04 | 2010-12-22 | 深圳创维－Rgb电子有限公司 | Circuit for eliminating earphone plosion of liquid crystal display television |
Also Published As
| Publication number | Publication date |
|---|---|
| HK1174174A1 (en) | 2013-05-31 |
| CN102769729A (en) | 2012-11-07 |
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