CN107360503A - Surely hinder level pressure output device and hinder level pressure power amplifier surely - Google Patents
Surely hinder level pressure output device and hinder level pressure power amplifier surely Download PDFInfo
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- CN107360503A CN107360503A CN201710793927.9A CN201710793927A CN107360503A CN 107360503 A CN107360503 A CN 107360503A CN 201710793927 A CN201710793927 A CN 201710793927A CN 107360503 A CN107360503 A CN 107360503A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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Abstract
Level pressure output device and surely resistance level pressure power amplifier are hindered surely the invention provides a kind of, belong to broadcast technology field.The device includes audio signal input module,Signal processing module,Control module,Loadtype detection module and output module,Audio signal is received by audio signal input module,The audio signal of input is entered line amplitude and phase adjusted and the audio signal after regulation is amplified into filtering process by signal processing module,Then the control instruction exported by loadtype detection module according to control module detects the type of load equipment,Audio signal output is the pattern with load equipment type matching further according to output module described in the Type Control of load equipment by control module,Fixed resistance and level pressure are integrated into same circuit and carry out selection output by the present invention,The design cost for hindering level pressure output device surely can effectively be reduced,And can be according to type selecting resistance or the output of level pressure pattern surely accordingly of load equipment,Improve the flexibility of design.
Description
Technical field
The present invention relates to broadcast technology field, hinders level pressure output device and surely resistance level pressure work(surely in particular to a kind of
Put machine.
Background technology
Audio frequency power amplifier is divided into level pressure and hinders both of which surely, and existing power amplifier level pressure output and fixed-resistance output are separated, are made
Realized with different output circuits, for existing level pressure power amplifier typically using there is transformer output mode, small part employs no change
Depressor pattern, but this kind of transless pattern output voltage is single, can not change output according to demand.
It is existing to have transformer and transless power amplifier shortcoming difference as follows：
(a):The power amplifier for having transformer is increase output conversion transformer and associated feedback circuit on the basis of fixed resistance power amplifier,
Signal is changed into fixed resistance and level pressure both of which, exported from different transformer circuit, its shortcoming is increased to hinder level pressure surely
Transformer, volume is big, quality weight, and wiring is complicated, and manufacturing cost and cost of transportation are very high, for example 700W determines resistance level pressure
Transformer, quality is up to 6Kg, and quality is bigger if more powerful, and material requested is more, and every cost is higher.
(b):Existing transless level pressure power amplifier, although eliminate output determines resistance constant voltage transfomer, it is exported
Level pressure voltage be fixed single, for example the conventional level pressure voltage of industry has 70V, 100V, 110V, 120V etc., and existing nothing
Transformer level pressure power amplifier often selects one of which to fix output, and product can not be changed if producing, and such a power amplifier,
Can only level pressure output be unable to fixed-resistance output.
Also, the binding post of existing power amplifier level pressure output and fixed-resistance output is separated, and user is in use, need according to loudspeaker
Determine resistance level pressure type, select corresponding binding post to connect, loudspeaker be easily damaged in Miswire；Although output
Binding post hinder surely level pressure be it is separated, but user in use, the same time can only use one of which, if surely hinder level pressure wiring
Post has all connected corresponding loudspeaker, after high-power start, is easily damaged interlock circuit or can not directly start, wiring and using multiple
It is miscellaneous.
So fixed resistance and level pressure output can only be realized using different output circuits in the prior art, will can not hinder surely
Level pressure merges output.
The content of the invention
Level pressure output device and surely resistance level pressure power amplifier are hindered surely it is an object of the invention to provide a kind of, to improve above-mentioned ask
Topic.
What embodiments of the invention were realized in：
A kind of to hinder level pressure output device surely, the level pressure output device that hinders surely includes audio signal input module, at signal
Manage module, control module, loadtype detection module and output module, the audio signal input module with the signal
Manage module coupling, the signal processing module couples with the control module, the signal processing module also with the output mould
Block couples, and the control module couples with the loadtype detection module, the loadtype detection module and the output
Module couples, and the control module also couples with the output module, and the output module is used to couple with load equipment；It is described
Audio signal input module, for receiving audio signal；The signal processing module, for the audio signal of input to be entered
Line amplitude and phase adjusted and the audio signal after regulation is amplified filtering process；The loadtype detection module,
Control instruction for being exported according to the control module detects the type of the load equipment, wherein, the load equipment
Type is fixed resistance or level pressure type；The control module, for output module described in the Type Control according to the load equipment
It is the pattern with the load equipment type matching by audio signal output.
In preferred embodiments of the present invention, the signal processing module include filtration module, signal-adjusting module and
Power amplifier module, the filtration module are coupled with the audio signal input module, and the filtration module is adjusted with the signal
Save module coupling, the signal-adjusting module couples with the power amplifier module, the power amplifier module respectively with it is described
Control module, output module coupling；The filtration module, for being filtered place to the audio signal received
Reason；The signal-adjusting module, for entering line amplitude and phase adjusted to the filtered audio signal, to obtain default
Audio signal in audiorange；Institute's power amplifier module, for the audio signal after regulation to be amplified into processing.
In preferred embodiments of the present invention, the control module includes central processing module, gain amplifier control module
And output mode control module, the central processing module respectively with the gain amplifier control module, the output mode
Control module couples, and the gain amplifier control module couples with the power amplifier module, the output mode control module
Coupled with the output module, the central processing module also couples with the loadtype detection module；The central processing
Module, change the power amplifier module for gain amplifier control module described in the Type Control according to the load equipment
Signal gain amplifier, and controlled and referred to according to corresponding to the type to output mode control module output of the load equipment
Order；The output mode control module, for adjusting the output mode of the output module according to the control instruction, by institute
The audio signal output for stating output module output is the pattern with the load equipment type matching.
In preferred embodiments of the present invention, the gain amplifier control module include the first switching circuit, first resistor,
Second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance and the first electric capacity, first switching circuit include the
One switch, second switch, the 3rd switch and the 4th switch, first switching circuit couple with the central processing module, institute
The one end for stating first switch couples with one end of the first resistor, one end of the second switch and the one of the second resistance
End coupling, one end of the 3rd switch couples with one end of the 3rd resistor, the described 4th one end switched and described the
Four resistance one end coupling, the other end of the first resistor, the other end of the second resistance, the 3rd resistor it is another
End, the one end of the other end of the 4th resistance with the 5th resistance couple, the other end of the 5th resistance with it is described
6th resistance one end coupling, the other end of the first switch, the second switch the other end, it is described 3rd switch it is another
The other end of one end, the other end of the 4th switch with the 6th resistance couples, one end difference of first electric capacity
One end of the other end, the 6th resistance with the 5th resistance couples, the other end ground connection of first electric capacity.
In preferred embodiments of the present invention, the output mode control module includes the second switching circuit and the 3rd switching
Circuit, second switching circuit are opened including the first inductance, the second inductance, the 3rd inductance, the 4th inductance, the 5th switch, the 6th
Close, the 7th switch and the 8th switch, the 3rd switching circuit include the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electricity
Hold, the 9th switch, the tenth switch, the 11st switch and the 12nd switch, the output mode control module also include the 5th electricity
Sense, the 6th inductance, the 7th inductance, the 6th electric capacity and the 7th electric capacity, second switching circuit and the 3rd switching circuit are equal
Coupled with the central processing module, one end of the 5th switch couples with one end of first inductance, and the described 6th opens
One end of pass couples with one end of second inductance, and one end of the 7th switch couples with one end of the 3rd inductance,
One end of 8th switch couples with one end of the 4th inductance, the other end of first inductance, second inductance
One end with the 5th inductance of the other end, the other end, the other end of the 4th inductance of the 3rd inductance couple,
One end of 5th inductance couples with one end of the 6th inductance, the other end of the 5th switch, the 6th switch
The other end, the 7th switch the other end and the described 8th switch other end coupling of the other end with the 6th inductance
Close, and one end with the 7th inductance couple, one end that the other end of the 7th inductance switchs with the described 9th respectively,
One end of tenth switch, one end of the 11st switch, one end of the 12nd switch couple, the 9th switch
The other end coupled with one end of second electric capacity, one end coupling of the other end and the 3rd electric capacity of the tenth switch
Close, the other end of the 11st switch couples with one end of the 4th electric capacity, the other end of the 12nd switch and institute
State one end coupling of the 5th electric capacity, the other end of second electric capacity, the other end of the 3rd electric capacity, the 4th electric capacity
The other end of the other end and the 5th electric capacity is grounded, one end of the 6th electric capacity and the other end coupling of the 5th inductance
Close, the other end ground connection of the 6th electric capacity, one end of the 7th electric capacity couples with the other end of the 6th inductance, described
The other end ground connection of 7th electric capacity.
In preferred embodiments of the present invention, the loadtype detection module includes signal loading circuit, current detecting
Circuit, amplifying circuit and analog to digital conversion circuit, the signal loading circuit and the current detection circuit with the control
Module couples, and the signal loading circuit and the current detection circuit couple with the output module, the current detecting
Circuit couples with the amplifying circuit, and the amplifying circuit couples with analog-digital conversion circuit as described, analog-digital conversion circuit as described with
The control module coupling.
In preferred embodiments of the present invention, the signal loading circuit includes the 7th resistance, the 8th resistance, the 9th electricity
Resistance, the tenth resistance, the 11st resistance, the 8th electric capacity, the 9th electric capacity, the first relay, the first diode, the first triode and
Standard signal source, one end of the 7th resistance couple with control module, and the other end of the 7th resistance is respectively with described
One end of eight resistance, one end coupling of the 8th electric capacity, the other end of the 8th electric capacity are another with the 8th resistance
End is grounded, and the base stage of the other end of the 7th resistance also with first triode couples, the collection of first triode
Electrode couples with one end of the first relay described in the anode of first diode, the 9th electric capacity, the one or three pole
The grounded emitter of pipe, the negative electrode of first diode couple with one end of the 9th resistance, the 9th resistance it is another
One end couples with first relay, the other end of the 9th electric capacity ground connection, and first relay is also with the described tenth
One end coupling of resistance, the other end of the tenth resistance one end with the 11st resistance, the standard signal source respectively
Coupling, the other end ground connection of the 11st resistance.
In preferred embodiments of the present invention, the current detection circuit includes the 12nd resistance, the 13rd resistance, the tenth
Four resistance, the tenth electric capacity, the 11st electric capacity, the 12nd electric capacity, the 13rd electric capacity, the second relay, the second triode, the two or two
Pole pipe, the 3rd diode, the 4th diode and current detector, one end and the control module coupling of the 12nd resistance
Close, the other end of the 12nd resistance one end with the 13rd resistance, one end of the tenth electric capacity, described the respectively
The base stage coupling of two triodes, the other end of the tenth electric capacity, the other end, second triode of the 13rd resistance
Grounded emitter, the colelctor electrode of second triode respectively the anode with second diode, second relay,
One end coupling of 11st electric capacity, the other end ground connection of the 11st electric capacity, the negative electrode of second diode and institute
One end coupling of the 14th resistance is stated, the other end of the 14th resistance couples with second relay, and the described 11st
One end of electric capacity also couples with second relay, and second relay couples with the output module, described second after
Anode of the electrical equipment also with the 3rd diode couples, the negative electrode of the 3rd diode and the negative electrode coupling of the 4th diode
Close, the plus earth of the 4th diode, the anode of the 3rd diode also couples with the current detector, the electricity
It is in parallel between current sensor, the 12nd electric capacity, the 13rd electric capacity.
In preferred embodiments of the present invention, the amplifying circuit includes the 14th electric capacity, the 15th electric capacity, the 15th electricity
Resistance, the 16th resistance, the 17th resistance, the 18th resistance, the 19th resistance and amplifier, analog-digital conversion circuit as described include the
16 electric capacity, the 17th electric capacity, the 20th resistance and modulus conversion chip, one end and the electric current of the 14th electric capacity are examined
Survey module coupling, the other end of the 14th electric capacity and one end of the 15th resistance, the positive input of the amplifier
End coupling, the other end ground connection of the 15th resistance, the reverse input end of the amplifier and the one of the 16th resistance
End coupling, the other end ground connection of the 16th resistance, one end of the 16th resistance also with the 17th resistance one
End coupling, the other end of the 17th resistance couples with the output end of the amplifier, the output end of the amplifier also with
One end coupling of 18th resistance, one end of the other end of the 18th resistance and the 15th electric capacity, described the
One end coupling of 19 resistance, the other end of the other end of 15 electric capacity and the 19th resistance is grounded, and described the
One end of 19 resistance couples with the modulus conversion chip, one end and the modulus conversion chip coupling of the 16th electric capacity
Close, the other end of the 16th electric capacity ground connection, one end also with the 20th resistance of the modulus conversion chip, the described 17th
One end coupling of electric capacity, the other end, the other end of the 17th electric capacity of the 20th resistance are grounded, and the modulus turns
Chip is changed also to couple with the control module.
A kind of to hinder level pressure power amplifier surely, the level pressure power amplifier that hinders surely includes load equipment and hinders level pressure output device surely,
Surely the resistance level pressure output device couples with the load equipment.
The beneficial effect of the embodiment of the present invention is：
The embodiment of the present invention provides a kind of resistance level pressure output device surely and hinders level pressure power amplifier surely, is inputted by audio signal
Module receives audio signal, and the audio signal of input is entered line amplitude and phase adjusted and by after regulation by signal processing module
Audio signal is amplified filtering process, and the control instruction then exported by loadtype detection module according to control module is examined
Survey the type of the load equipment, control module is further according to output module described in the Type Control of the load equipment by the sound
Frequency signal output is pattern with the load equipment type matching, and fixed resistance and level pressure are integrated into same circuit in the present embodiment
Selection output is carried out, can effectively reduce the design cost for hindering level pressure output device surely, and can be according to load equipment
Type selecting resistance or the output of level pressure pattern surely accordingly, improves the flexibility of design.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by embodiment it is required use it is attached
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore be not construed as pair
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 is a kind of structured flowchart for hindering level pressure output device surely provided in an embodiment of the present invention；
Fig. 2 is another structured flowchart for hindering level pressure output device surely provided in an embodiment of the present invention；
Fig. 3 is a kind of circuit theory diagrams of gain amplifier control module provided in an embodiment of the present invention；
Fig. 4 is a kind of circuit theory diagrams of output mode control module provided in an embodiment of the present invention；
Fig. 5 is a kind of circuit theory diagrams of loadtype detection module provided in an embodiment of the present invention；
Fig. 6 is a kind of structured flowchart for hindering level pressure power amplifier surely provided in an embodiment of the present invention.
Icon：200- hinders level pressure power amplifier surely；210- load equipments；100- hinders level pressure output device surely；110- audios are believed
Number input module；120- signal processing modules；122- filtration modules；124- signal-adjusting modules；126- power amplifier modules；
130- control modules；132- central processing modules；134- gain amplifier control modules；136- output mode control modules；140-
Loadtype detection module；142- signal loading circuits；144- current detection circuits；1441- current detectors；146- amplification electricity
Road；148- analog to digital conversion circuits；150- output modules.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.The present invention implementation being generally described and illustrated herein in the accompanying drawings
The component of example can be configured to arrange and design with a variety of.
Therefore, below the detailed description of the embodiments of the invention to providing in the accompanying drawings be not intended to limit it is claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.It is common based on the embodiment in the present invention, this area
The every other embodiment that technical staff is obtained under the premise of creative work is not made, belong to the model that the present invention protects
Enclose.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent accompanying drawing in individual accompanying drawing.
In addition, term " first ", " second ", " the 3rd " etc. are only used for distinguishing description, and it is not intended that instruction or hint
Relative importance.
In the description of the invention, it is also necessary to explanation, unless otherwise clearly defined and limited, term " setting ",
" coupling ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or one
Connect body；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirect by intermediary
It is connected, can is the connection of two element internals.For the ordinary skill in the art, on being understood with concrete condition
State the concrete meaning of term in the present invention.
Other features and advantages of the present invention will illustrate in subsequent specification, also, partly become from specification
It is clear that or understood by implementing the embodiment of the present invention.The purpose of the present invention and other advantages can be by being write
Specifically noted structure is realized and obtained in specification, claims and accompanying drawing.
It refer to Fig. 1, Fig. 1 is a kind of structured flowchart for hindering level pressure output device 100 surely provided in an embodiment of the present invention, institute
Stating fixed resistance level pressure output device 100 includes audio signal input module 110, signal processing module 120, control module 130, load
Type detection module 140 and output module 150, the audio signal input module 110 and the coupling of signal processing module 120
Close, the signal processing module 120 couples with the control module 130, the signal processing module 120 also with the output mould
Block 150 couples, and the control module 130 couples with the loadtype detection module 140, the loadtype detection module
140 couple with the output module 150, and the control module 130 also couples with the output module 150, the output module
150 are used to couple with load equipment (not shown).
The audio signal input module 110 is used to receive audio signal input.It is defeated as a kind of mode, the audio signal
Entering module 110 can be designed using interface circuit.
The signal processing module 120, for the audio signal of input to be entered into line amplitude and phase adjusted and incited somebody to action
Audio signal after regulation is amplified filtering process.
The loadtype detection module 140, for exported according to the control module 130 control instruction detection described in
The type of load equipment, wherein, the type of the load equipment is fixed resistance or level pressure type.
The control module 130, for output module 150 described in the Type Control according to the load equipment by the sound
Frequency signal output is the pattern with the load equipment type matching, i.e., hinders pattern or level pressure pattern surely.
Fig. 2 is refer to, Fig. 2 is another structured flowchart for hindering level pressure output device 100 surely provided in an embodiment of the present invention,
As a kind of mode, the signal processing module 120 includes filtration module 122, signal-adjusting module 124 and power amplification mould
Block 126, the filtration module 122 couple with the audio signal input module 110, the filtration module 122 and the signal
Adjustment module 124 couples, and the signal-adjusting module 124 couples with the power amplifier module 126, the power amplifier module
126 couple with the control module 130, the output module 150 respectively.
The filtration module 122, for being filtered processing to the audio signal received, certainly, in order to realize
Output impedance and load equipment impedance matching, also need to match input impedance.If the in addition, frequency of the audio signal of input
It is too high or too low, then can not meet the needs of load equipment, it is described can also be filtered out by the filtration module 122 frequency it is too high or
Too low audio signal, to obtain the audio signal in the range of preset audio, for example, audio signal frequency is generally 20-
20KHZ, by the regulation of the signal-adjusting module 124, the idling frequency beyond required frequency range can be filtered out.It is used as one kind side
Formula, the filtration module 122 can use filter capacitor or filter resistance to be designed.
The signal-adjusting module 124 is used to enter line amplitude and phase adjusted to the filtered audio signal.As
A kind of mode, the signal-adjusting module 124 can use the power amplifier module 126, for by the sound after regulation
Frequency signal is amplified processing, and the possibility amplitude that the audio signal after regulation has is relatively low, so also needing the sound of these low amplitudes
Frequency signal exports after being amplified by the power amplifier module 126, and as a kind of mode, the power amplifier module 126 includes
The auxiliary circuit of amplification chip, high-power power amplification tube and correlation, low amplitude signal pass through amplification chip, high-power power amplification tube and phase
After the Comprehensive Control for closing auxiliary circuit, high-amplitude high-power signal is zoomed into.
As a kind of mode, the control module 130 include central processing module 132, gain amplifier control module 134 with
And output mode control module 136, the central processing module 132 respectively with the gain amplifier control module 134, described defeated
Exit pattern control module 136 couples, and the gain amplifier control module 134 couples with the power amplifier module 126, described defeated
Exit pattern control module 136 is coupled with the output module 150, and the central processing module 132 is also examined with the loadtype
Module 140 is surveyed to couple.
The central processing module 132, mould is controlled for gain amplifier described in the Type Control according to the load equipment
Block 134 changes the signal gain amplifier of the power amplifier module 126, and according to the type of the load equipment to described defeated
Exit pattern control module 136 exports corresponding control instruction.
The gain amplifier control module 134 receives the relevant control instruction that central processing module 132 is sent, and according to this
Control instruction performs corresponding switching action, changes the signal gain amplifier of power amplifier module 126, so as to change output audio letter
Number effective breadth.
The output mode control module 136, for adjusting the output of the output module 150 according to the control instruction
Pattern, the audio signal output that the output module 150 is exported are the pattern with the load equipment type matching, also
It is that the control instruction sent according to central processing module 132 performs corresponding switching action, the filtering ginseng of regulation output module 150
Number and effective output impedance, enter to be about to the audio signal regulation of output to the pattern of load equipment demand, i.e., hinder pattern or fixed surely
Die pressing type.
The output module 150 is additionally operable to filter out carrier wave and other garbage signals in audio signal, and carries out output resistance
Anti- regulation, exports audio signal is issued to specific power output in specified impedance condition and export.
Wherein, central processing module 132 typically uses single-chip microcomputer or the ARM chips with ARM kernels, such as STM32FXX systems
Row, the central processing module 132 can carry out network communication by network management interface and exterior terminal equipment or equivalent devices,
And also obtain parameter setting of the user to load equipment.
Central processing module 132 is also communicated by SPI and loadtype detection module 140, is read and is examined from loadtype
Survey the type of the feedback information, i.e. load equipment of module 140.
Central processing module 132 to gain amplifier control module 134, output mode control module 136 and is born by I/O port
Type detection module 140 is carried to be controlled.
The operation principle of control module 130 is as follows：
Central processing module 132 can obtain user to load equipment by network interface with web-based management form web page
Parameter configuration, include the power output of load equipment, wave volume, frequency modulation input etc., then by these parameter informations
Preserved, in the initialization time section that load equipment starts, send loadtype detection instruction, loadtype detection module
140 receive progress circuit function switching after the instruction, are transformed into the pattern of loadtype detection, now, loadtype detection
The correlation properties data of the feedback load equipment of module 140, such as load impedance, voltage swing and size of current etc., central processing
Module 132 judges the type of load equipment according to these data, if for example, detecting that voltage in 2.5V-3.3V, judges
Load equipment type is fixed resistance, judges load equipment type for level pressure if 2.5V is less than；And the central processing module 132 will be sentenced
Fixed result is compared with user is to the configuration parameter of load equipment, than in the case of more consistent, even user is to load
Configuration parameter represent that the load equipment is level pressure type, and judge that the load equipment is also level pressure type, then start respective mode
Gain control and output mode control signal, gain amplifier control module 134 are receiving with output mode control module 136 under formula
To after command adapted thereto, corresponding switching action is carried out, so as to which audio signal to be carried out to the output of corresponding modes.
Fig. 3 is refer to, Fig. 3 is a kind of circuit theory diagrams of gain amplifier control module 134 provided in an embodiment of the present invention,
The gain amplifier control module 134 includes the first switching circuit, first resistor R1, second resistance R2,3rd resistor R3, the 4th
Resistance R4, the 5th resistance R5, the 6th resistance R6 and the first electric capacity C1, first switching circuit include first switch K1, second
K2, the 3rd switch K3 and the 4th switch K4 are switched, first switching circuit couples with the central processing module 132, described
First switch K1 one end couples with one end of the first resistor R1, one end and the second resistance of the second switch K2
R2 one end coupling, one end of the 3rd switch K3 couple with one end of the 3rd resistor R3, the 4th switch K4's
One end couples with one end of the 4th resistance R4, the other end of the first resistor R1, the second resistance R2 the other end,
The one end of the other end of the 3rd resistor R3, the other end of the 4th resistance R4 with the 5th resistance R5 couples, institute
The other end for stating the 5th resistance R5 couples with one end of the 6th resistance R6, the other end of the first switch K1, described
The two switch K2 other end, the other end of the 3rd switch K3, the other end of the 4th switch K4 are electric with the described 6th
Hinder R6 other end coupling, one end of the first electric capacity C1 other end with the 5th resistance R5, the 6th electricity respectively
Hinder R6 one end coupling, the other end ground connection of the first electric capacity C1.
Wherein, SEL_A_1 the and SEL_A_2 ports of the first switching circuit couple with central processing module 132, the 5th resistance
R5 one end, the 6th resistance R6 other end are also connected with other auxiliary circuits in the gain amplifier control module 134.It is central
Centre processing module 132 is judged after being currently needed for the mode of operation of use, i.e., fixed resistance or level pressure pattern, then passes through SEL_A_1/
2 send instruction, and the first switching circuit is held according to instruction class, carries out corresponding handover operation, when the first switching circuit uses first
Resistance R1, second resistance R2,3rd resistor R3, the 4th resistance R4 different resistances when, the multiplication factor of whole power amplifier just occurs
Change, so that respective change occurs for output voltage, because whether fixed resistance or level pressure, in the output form of expression, except
Inconsistent output impedance is exactly that output voltage is inconsistent, and gain control is actually to be used to adjust output voltage.
Fig. 4 is refer to, Fig. 4 is a kind of circuit theory diagrams of output mode control module 136 provided in an embodiment of the present invention,
The output mode control module 136 includes the second switching circuit and the 3rd switching circuit, and second switching circuit includes the
One inductance L1, the second inductance L2, the 3rd inductance L3, the 4th inductance L4, the 5th switch K5, the 6th switch K6, the 7th switch K7 and
8th switch K8, the 3rd switching circuit include the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5, the
Nine switch K9, the tenth switch K10, the 11st switch K11 and the 12nd switch K12, the output mode control module 136 are also wrapped
Include the 5th inductance L5, the 6th inductance L6, the 7th inductance L7, the 6th electric capacity C6 and the 7th electric capacity C7, second switching circuit and
3rd switching circuit couples with the central processing module 132, one end of the 5th switch K5 and the described first electricity
Feel L1 one end coupling, one end of the 6th switch K6 couples with one end of the second inductance L2, the 7th switch K7
One end coupled with one end of the 3rd inductance L3, one end and the 4th inductance L4 of the 8th switch K8 one end coupling
Close, the other end of the first inductance L1, the other end of the second inductance L2, the other end, described of the 3rd inductance L3
The one end of the 4th inductance L4 other end with the 5th inductance L5 couples, the other end of the 5th inductance L5 and described the
Six inductance L6 one end coupling, the other end of the 5th switch K5, the other end of the 6th switch K6, the 7th switch
The K7 other end couples with the described 8th switch K8 other end of the other end with the 6th inductance L6, and with described the
Seven inductance L7 one end coupling, the other end of the 7th inductance L7 switch K9 one end, the described tenth with the described 9th respectively
Switch K10 one end, one end of the 11st switch K11, one end of the 12nd switch K12 couple, and the described 9th opens
The other end for closing K9 couples with one end of the second electric capacity C2, the other end and the 3rd electric capacity of the tenth switch K10
C3 one end coupling, the other end of the 11st switch K11 couple with one end of the 4th electric capacity C4, and the described 12nd opens
The other end for closing K12 couples with one end of the 5th electric capacity C5, the other end of the second electric capacity C2, the 3rd electric capacity C3
The other end, the other end of the other end and the 5th electric capacity C5 of the 4th electric capacity C4 be grounded, the 6th electric capacity C6
One end coupled with the other end of the 5th inductance L5, the other end of the 6th electric capacity C6 ground connection, the 7th electric capacity C7
One end coupled with the other end of the 6th inductance L6, the other end of the 7th electric capacity C7 ground connection.
Wherein, SEL_A_1 the and SEL_A_2 ports of the second switching circuit couple with central processing module 132, the 3rd switching
SEL_A_1 the and SEL_A_2 ports of circuit couple with central processing module 132, certainly, the 5th inductance L5 other end, the 7th
The inductance L7 other end is also connected with other auxiliary circuits in the output mode control module 136.When central processing module 132
Judge after being currently needed for the mode of operation of use, i.e., fixed resistance or level pressure pattern, then sent and instructed by SEL_A_1/2, the
Two switching circuits and the 3rd switching circuit carry out corresponding handover operation, when the second switching circuit uses the first electricity according to instruction
Feel L1, the second inductance L2, the 3rd inductance L3, the 4th inductance L4 different value and the 3rd switching circuit use the second electric capacity C2, the
Three electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5 different value when, the filtering characteristic and output impedance of power amplifier output loop are sent out
Changing, so that with load equipment type matching, reach the function that switching output mode controls.
Fig. 5 is refer to, Fig. 5 is a kind of circuit theory diagrams of loadtype detection module 140 provided in an embodiment of the present invention,
The loadtype detection module 140 includes signal loading circuit 142, current detection circuit 144, amplifying circuit 146 and mould
Number change-over circuits 148, the signal loading circuit 142 and the current detection circuit 144 with the coupling of control module 130
Close, the signal loading circuit 142 and the current detection circuit 144 couple with the output module 150, the electric current inspection
Slowdown monitoring circuit 144 couples with the amplifying circuit 146, and the amplifying circuit 146 couples with analog-digital conversion circuit as described 148, described
Analog to digital conversion circuit 148 couples with the control module 130.
The signal loading circuit 142 include the 7th resistance R7, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10,
11st resistance R11, the 8th electric capacity C8, the 9th electric capacity C9, the first relay JZX1, the first diode D1, the first triode Q1
And standard signal source AC, one end of the 7th resistance R7 are coupled by IOA ports with control module 130, the 7th electricity
One end with the 8th resistance R8, one end of the 8th electric capacity C8 couple the resistance R7 other end respectively, the 8th electric capacity
The other end of the C8 other end and the 8th resistance R8 is grounded, and the other end of the 7th resistance R7 is also with the described 1st
Pole pipe Q1 base stage coupling, the colelctor electrode of the first triode Q1 and the first relay described in the anode of the first diode D1
Device JZX1, the 9th electric capacity C9 one end coupling, the grounded emitter of the first triode Q1, the first diode D1
Negative electrode coupled with one end of the 9th resistance R9, the other end of the 9th resistance R9 and the first relay JZX1 couplings
Close, the other end ground connection of the 9th electric capacity C9, one end couplings of the first relay JZX1 also with the tenth resistance R10
Closing, one end with the 11st resistance R11, the standard signal source AC are coupled the other end of the tenth resistance R10 respectively,
The other end ground connection of the 11st resistance R11.
The current detection circuit 144 includes the 12nd resistance R12, the 13rd resistance R13, the 14th resistance R14, the tenth
Electric capacity C10, the 11st electric capacity C11, the 12nd electric capacity C12, the 13rd electric capacity C13, the second relay JZX2, the second triode
Q2, the second diode D2, the 3rd diode D3, the 4th diode D4 and current detector 1441, the 12nd resistance R12's
One end couples with the control module 130, and the other end of the 12nd resistance R12 is respectively with the 13rd resistance R13's
One end, the base stage coupling of one end of the tenth electric capacity C10, the second triode Q2, the tenth electric capacity C10's is another
Hold, the grounded emitter of the other end, the second triode Q2 of the 13rd resistance R13, the second triode Q2's
The colelctor electrode anode with the second diode D2, the second relay JZX2, one end of the 11st electric capacity C11 respectively
Coupling, the other end ground connection of the 11st electric capacity C11, negative electrode and the 14th resistance R14 of the second diode D2
One end coupling, the other end of the 14th resistance R14 couples with the second relay JZX2, the 11st electric capacity
C11 one end also couples with the second relay JZX2, and the second relay JZX2 couples with the output module 150,
Anodes of the second relay JZX2 also with the 3rd diode D3 couples, the negative electrode of the 3rd diode D3 with it is described
4th diode D4 negative electrode coupling, the plus earth of the 4th diode D4, the anode of the 3rd diode D3 also with
The current detector 1441 couples, the current detector 1441, the 12nd electric capacity C12, the 13rd electric capacity C13
Between it is in parallel.
The amplifying circuit 146 includes the 14th electric capacity C14, the 15th electric capacity C15, the 15th resistance R15, the 16th electricity
Hinder R16, the 17th resistance R17, the 18th resistance R18, the 19th resistance R19 and amplifier F1, analog-digital conversion circuit as described 148
Including the 16th electric capacity C16, the 17th electric capacity C17, the 20th resistance R20 and modulus conversion chip U1, the 14th electric capacity
C14 one end couples with the current detection module, the other end and the 15th resistance R15 of the 14th electric capacity C14
One end, the amplifier F1 positive input coupling, the 15th resistance R15 the other end ground connection, the amplifier
F1 reverse input end couples with one end of the 16th resistance R16, the other end ground connection of the 16th resistance R16, institute
State the one end of the 16th resistance R16 one end also with the 17th resistance R17 to couple, the 17th resistance R17's is another
End couples with the output end of the amplifier F1, the one end of the output end of the amplifier F1 also with the 18th resistance R18
Coupling, the other end of the 18th resistance R18 and one end of the 15th electric capacity C15, the one of the 19th resistance R19
End coupling, the other end of the other end of 15 electric capacity and the 19th resistance R19 are grounded, the 19th resistance
R19 one end couples with the modulus conversion chip U1, one end and the modulus conversion chip U1 of the 16th electric capacity C16
Coupling, the other end ground connection of the 16th electric capacity C16, one end also with the 20th resistance R20 of the modulus conversion chip U1,
One end coupling of the 17th electric capacity C17, the other end of the 20th resistance R20, the 17th electric capacity C17 it is another
End is grounded, and the modulus conversion chip U1 also couples with the control module 130.
As illustrated, output module 150 includes power amplifier output plug, the P1 in figure is power amplifier out splice going splice, cascade after P1
Load equipment is connect, i.e., fixed resistance or level pressure loudspeaker, after load equipment is connected on P1 ports, it is possible to by testing P1 ends
Equiva lent impedance on mouth, so as to judge the type of load equipment, its Cleaning Principle is as follows：In the opening initialization of load equipment
Stage, central processing module 132 control IOA and IOB ports to switch over, and circuit-mode is switched into load equipment detection mould
Formula, now in standard signal source AC signal loading to P1 ports, returned to after load equipment on current detector 1441,
Different load equipment types, the form and amplitude of the waveform obtained on current detector 1441 are different, and the signal
After analog to digital conversion circuit 148 carries out analog-to-digital conversion, central processing module 132 is fed back to, central processing module 132 passes through logarithm
According to analyzing and processing after, be compared with the inherent data of different loads equipment, you can analyze the type of present load equipment,
Central processing module 132 sends normal work instruction after the completion of load equipment initialization, IOA and IOB ports switch, made again
Circuit enters the mode state of normal signal output.
In the embodiment of the present invention, level pressure output device 100 is hindered surely and may also include alarm module, is detecting load equipment class
Alarmed when type mismatches with user to the configuration parameter of load equipment by alarm module, so as to avoid because of wiring error
Or improper use damage load equipment.
In addition, hindering level pressure output device 100 surely eliminates fixed resistance level pressure conversion transformer, and remain with original transformation
The repertoire of device, especially on High-power amplifier, every cost such as production, material, transport, installation is greatly reduced,
Machine dimensions can be reduced simultaneously, reduce line and complex structural designs degree.
Also, the unification of level pressure binding post will can be surely hindered in the present embodiment to a binding post output, wiring and using simple
It is single, and the same time this hinder surely level pressure output device 100 be only possible to export it is a kind of with load equipment type matching audio signal,
Effectively reduce the complexity of circuit design.
It should be noted that hindering the control of the output mode of level pressure output device 100 surely, i.e., export on earth and hinder pattern also surely
It is any pattern in level pressure pattern, or level pressure pattern, is judged jointly by two conditions, first, user's web administration
The output mode configured in device, second, the mould that the loadtype that automatic load type detection module 140 detects is calculated
Formula, when completely the same both this, hinder surely after level pressure output device 100 starts and be cut to corresponding pattern immediately, when both not
When consistent, control module 130 can end power amplifier output, send alarm signal, and discharge user model confirmation signal, if with
Family confirms currently used method, then output mode is defined by user to load equipment configuration.
Wherein, level pressure pattern typically has several level pressure patterns such as 70V/100V/110V/120V/240V.
Fig. 6 is refer to, Fig. 6 is a kind of structured flowchart for hindering level pressure power amplifier 200 surely provided in an embodiment of the present invention, described
Surely hindering level pressure power amplifier 200 includes load equipment 210 and above-mentioned determines resistance level pressure output device 100, load equipment 210 and fixed resistance
Level pressure output device 100 couples.
As a kind of mode, load equipment 210 can be loudspeaker, sound equipment etc..Load equipment 210, which can have, determines resistance or level pressure
Two types, hindering level pressure output device 100 surely can select level pressure to export or hinder surely defeated according to the type of load equipment 210
Go out, so as to which fixed resistance and level pressure output are incorporated into a circuit output, effectively prevent because the wiring of load equipment 210 is wrong
Cause by mistake or improper use damages load equipment 210, improve the security of load equipment 210.
In summary, the embodiment of the present invention provides a kind of resistance level pressure output device surely and hinders level pressure power amplifier surely, passes through sound
Frequency signal input module receive audio signal, signal processing module by the audio signal of input enter line amplitude and phase adjusted and
Audio signal after regulation is amplified filtering process, then exported by loadtype detection module according to control module
Control instruction detects the type of the load equipment, and control module exports mould further according to described in the Type Control of the load equipment
Audio signal output is the pattern with the load equipment type matching by block, will surely be hindered in the present embodiment and be integrated with level pressure
Selection output is carried out to same circuit, can effectively reduce the design cost for hindering level pressure output device surely, and can basis
Resistance or the output of level pressure pattern surely accordingly of the type selecting of load equipment, improves the flexibility of design.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
1. a kind of hinder level pressure output device surely, it is characterised in that the level pressure output device that hinders surely includes audio signal input mould
Block, signal processing module, control module, loadtype detection module and output module, the audio signal input module with
Signal processing module coupling, the signal processing module couple with the control module, the signal processing module also with
The output module coupling, the control module couple with the loadtype detection module, the loadtype detection module
Coupled with the output module, the control module also couples with the output module, and the output module is used to set with load
Standby coupling；
The audio signal input module, for receiving audio signal；
The signal processing module, for the audio signal of input to be entered into line amplitude and phase adjusted and by after regulation
Audio signal is amplified filtering process；
The loadtype detection module, the control instruction for being exported according to the control module detect the load equipment
Type, wherein, the type of the load equipment is fixed resistance or level pressure type；
The control module, the audio signal is exported for output module described in the Type Control according to the load equipment
For the pattern with the load equipment type matching.
2. according to claim 1 hinder level pressure output device surely, it is characterised in that the signal processing module includes filtering
Module, signal-adjusting module and power amplifier module, the filtration module couples with the audio signal input module, described
Filtration module couples with the signal-adjusting module, and the signal-adjusting module couples with the power amplifier module, the work(
Rate amplification module couples with the control module, the output module respectively；
The filtration module, for being filtered processing to the audio signal received；
The signal-adjusting module, for entering line amplitude and phase adjusted to the filtered audio signal, to obtain pre-
If the audio signal in audiorange；
Institute's power amplifier module, for the audio signal after regulation to be amplified into processing.
3. according to claim 2 hinder level pressure output device surely, it is characterised in that the control module includes central processing
Module, gain amplifier control module and output mode control module, the central processing module respectively with the gain amplifier
Control module, output mode control module coupling, the gain amplifier control module couple with the power amplifier module,
The output mode control module couples with the output module, and the central processing module also detects mould with the loadtype
Block couples；
The central processing module, change institute for gain amplifier control module described in the Type Control according to the load equipment
State the signal gain amplifier of power amplifier module, and according to the type of the load equipment to the output mode control module
Control instruction corresponding to output；
The output mode control module, will for adjusting the output mode of the output module according to the control instruction
The audio signal output of the output module output is the pattern with the load equipment type matching.
4. according to claim 3 hinder level pressure output device surely, it is characterised in that the gain amplifier control module includes
First switching circuit, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance and the first electric capacity,
First switching circuit includes first switch, second switch, third switch and the 4th switch, first switching circuit and institute
Central processing module coupling is stated, one end of the first switch couples with one end of the first resistor, the second switch
One end couples with one end of the second resistance, and one end of the 3rd switch couples with one end of the 3rd resistor, described
4th switch one end coupled with one end of the 4th resistance, the other end of the first resistor, the second resistance it is another
The one end of one end, the other end, the other end of the 4th resistance of the 3rd resistor with the 5th resistance couples, described
The other end of 5th resistance couples with one end of the 6th resistance, the other end of the first switch, the second switch
The other end of the other end, the other end, the other end of the 4th switch of the 3rd switch with the 6th resistance couples,
The other end with the 5th resistance, one end of the 6th resistance couple respectively for one end of first electric capacity, and described first
The other end ground connection of electric capacity.
5. according to claim 3 hinder level pressure output device surely, it is characterised in that the output mode control module includes
Second switching circuit and the 3rd switching circuit, second switching circuit include the first inductance, the second inductance, the 3rd inductance, the
Four inductance, the 5th switch, the 6th switch, the 7th switch and the 8th switch, the 3rd switching circuit include the second electric capacity, the 3rd
Electric capacity, the 4th electric capacity, the 5th electric capacity, the 9th switch, the tenth switch, the 11st switch and the 12nd switch, the output mode
Control module also includes the 5th inductance, the 6th inductance, the 7th inductance, the 6th electric capacity and the 7th electric capacity, second switching circuit
Coupled with the 3rd switching circuit with the central processing module, one end of the 5th switch and first inductance
One end couple, it is described 6th switch one end coupled with one end of second inductance, it is described 7th switch one end with it is described
One end coupling of 3rd inductance, one end of the 8th switch couple with one end of the 4th inductance, first inductance
The other end, the other end of second inductance, the other end of the 3rd inductance, the 4th inductance the other end with it is described
One end coupling of 5th inductance, one end of the 5th inductance couple with one end of the 6th inductance, the 5th switch
The other end, the other end of the 6th switch, the 7th switch the other end and the described 8th switch the other end and institute
The other end coupling of the 6th inductance is stated, and one end with the 7th inductance couples, the other end difference of the 7th inductance
What one end of one end, the tenth switch with the described 9th switch, one end of the 11st switch, the described 12nd switched
One end couple, it is described 9th switch the other end couple with one end of second electric capacity, it is described tenth switch the other end and
One end coupling of 3rd electric capacity, the other end of the 11st switch couple with one end of the 4th electric capacity, and described the
The other end of 12 switches couples with one end of the 5th electric capacity, the other end of second electric capacity, the 3rd electric capacity
The other end, the other end of the other end and the 5th electric capacity of the 4th electric capacity are grounded, one end of the 6th electric capacity with
The other end coupling of 5th inductance, the other end ground connection of the 6th electric capacity, one end of the 7th electric capacity and described the
The other end coupling of six inductance, the other end ground connection of the 7th electric capacity.
6. according to claim 1 hinder level pressure output device surely, it is characterised in that the loadtype detection module includes
Signal loading circuit, current detection circuit, amplifying circuit and analog to digital conversion circuit, the signal loading circuit and the electric current
Detection circuit couples with the control module, the signal loading circuit and the current detection circuit with the output mould
Block couples, and the current detection circuit couples with the amplifying circuit, and the amplifying circuit couples with analog-digital conversion circuit as described,
Analog-digital conversion circuit as described couples with the control module.
7. according to claim 6 hinder level pressure output device surely, it is characterised in that the signal loading circuit includes the 7th
Resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11st resistance, the 8th electric capacity, the 9th electric capacity, the first relay, first
Diode, the first triode and standard signal source, one end of the 7th resistance couple with control module, the 7th resistance
The other end one end with the 8th resistance, one end of the 8th electric capacity couple respectively, the other end of the 8th electric capacity
It is grounded with the other end of the 8th resistance, the base stage coupling of the other end of the 7th resistance also with first triode
Close, the first relay described in the anode of the colelctor electrode of first triode and first diode, the 9th electric capacity
One end couples, the grounded emitter of first triode, one end of the negative electrode of first diode and the 9th resistance
Coupling, the other end of the 9th resistance coupled with first relay, and the other end of the 9th electric capacity is grounded, and described the
The one end of one relay also with the tenth resistance couples, the other end of the tenth resistance respectively with the 11st resistance
One end, standard signal source coupling, the other end ground connection of the 11st resistance.
8. according to claim 7 hinder level pressure output device surely, it is characterised in that the current detection circuit includes the tenth
Two resistance, the 13rd resistance, the 14th resistance, the tenth electric capacity, the 11st electric capacity, the 12nd electric capacity, the 13rd electric capacity, second after
Electrical equipment, the second triode, the second diode, the 3rd diode, the 4th diode and current detector, the 12nd resistance
One end couples with the control module, the other end of the 12nd resistance one end with the 13rd resistance, described respectively
One end of tenth electric capacity, the base stage coupling of second triode, the other end of the tenth electric capacity, the 13rd resistance
The grounded emitter of the other end, second triode, the colelctor electrode of second triode respectively with second diode
Anode, second relay, the 11st electric capacity one end coupling, the 11st electric capacity the other end ground connection, institute
The negative electrode for stating the second diode couples with one end of the 14th resistance, the other end and described second of the 14th resistance
Relay couples, and one end of the 11st electric capacity also couples with second relay, second relay with it is described defeated
Go out module coupling, anode of second relay also with the 3rd diode couple, the negative electrode of the 3rd diode and
The negative electrode coupling of 4th diode, the plus earth of the 4th diode, the anode of the 3rd diode also with institute
Current detector coupling is stated, it is in parallel between the current detector, the 12nd electric capacity, the 13rd electric capacity.
9. according to claim 8 hinder level pressure output device surely, it is characterised in that the amplifying circuit includes the 14th electricity
Appearance, the 15th electric capacity, the 15th resistance, the 16th resistance, the 17th resistance, the 18th resistance, the 19th resistance and amplifier,
Analog-digital conversion circuit as described includes the 16th electric capacity, the 17th electric capacity, the 20th resistance and modulus conversion chip, and the described 14th
One end of electric capacity couples with the current detection module, the other end of the 14th electric capacity and the one of the 15th resistance
End, the positive input coupling of the amplifier, the other end ground connection of the 15th resistance, the reverse input of the amplifier
End couples with one end of the 16th resistance, the other end ground connection of the 16th resistance, one end of the 16th resistance
One end also with the 17th resistance couples, and the other end of the 17th resistance couples with the output end of the amplifier,
The one end of the output end of the amplifier also with the 18th resistance couples, the other end of the 18th resistance and described the
One end of 15 electric capacity, one end coupling of the 19th resistance, the other end of 15 electric capacity and the 19th resistance
The other end be grounded, one end of the 19th resistance couples with the modulus conversion chip, the one of the 16th electric capacity
End is coupled with the modulus conversion chip, and the other end of the 16th electric capacity is grounded, and the modulus conversion chip is also with second
One end of ten resistance, one end coupling of the 17th electric capacity, the other end of the 20th resistance, the 17th electric capacity
The other end is grounded, and the modulus conversion chip also couples with the control module.
10. a kind of hinder level pressure power amplifier surely, it is characterised in that the level pressure power amplifier of resistance surely includes load equipment and claim
Determine resistance level pressure output device described in 1-9 is any, the level pressure output device of resistance surely couples with the load equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710793927.9A CN107360503B (en) | 2017-09-05 | 2017-09-05 | Constant-resistance constant-voltage output device and constant-resistance constant-voltage power amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710793927.9A CN107360503B (en) | 2017-09-05 | 2017-09-05 | Constant-resistance constant-voltage output device and constant-resistance constant-voltage power amplifier |
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| CN107360503B CN107360503B (en) | 2023-06-06 |
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| CN107360503B (en) | 2023-06-06 |
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