CN109586676A - A kind of full load automatic gain mesh power amplifier - Google Patents
A kind of full load automatic gain mesh power amplifier Download PDFInfo
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- CN109586676A CN109586676A CN201910072036.3A CN201910072036A CN109586676A CN 109586676 A CN109586676 A CN 109586676A CN 201910072036 A CN201910072036 A CN 201910072036A CN 109586676 A CN109586676 A CN 109586676A
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- 238000005859 coupling reaction Methods 0.000 claims abstract description 35
- 230000003287 optical effect Effects 0.000 claims abstract description 34
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/56—Modifications of input or output impedances, not otherwise provided for
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
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Abstract
The invention discloses a kind of full load automatic gain mesh power amplifiers, and suitable for the multiple systems including fixed resistance and level pressure, single-chip microcontroller calculates the resistance and output power of access load according to the test voltage and test electric current of measure voltage &；When output power is greater than rated power, by lowering the reference voltage of second operational amplifier inverting input terminal, output power is made to be equal to rated power；When output power is less than or equal to rated power, using test voltage as benchmark voltage；When the first operational amplifier output terminal voltage is greater than reference voltage, second operational amplifier exports high potential, the impedance of linear optical coupling becomes smaller, and the corresponding amplification factor for adjusting the first operational amplifier makes the first operational amplifier output terminal voltage be less than or equal to reference voltage.That is, Adaptive matching forward gain amplification factor makes power amplifier steady operation in design power to achieve the purpose that stable output power when the resistance of access load is any value.
Description
Technical field
The present invention relates to power amplifier techniques fields, amplify more particularly, to a kind of full load automatic gain mesh power
Device.
Background technique
In the research and practice to the prior art, it was found by the inventors of the present invention that being directed to 32 ohm, 16 ohm, 8 Europe
Nurse, 4 ohm, audio industries normal impedance, the power outputs of same traditional power amplifier such as 2 ohm it is simultaneously non-constant.Such as
Need same 500W power amplifier can export 2 ohm of 500W, 4 ohm can export 500W, 8 ohm can export 500W, l00V
Broadcast system equally has 500W, then needs to match the impedance for carrying out access load.It is, in the prior art, it is same
Platform 500W power amplifier can export 2 ohm of 500W, and 4 ohm can only export 300W or so, and 8 ohm can only export the left side 130W
The right side, 100V broadcast system cannot be used at all, and broadcast power amplifier all needs output transformer at present.
Therefore, conventional power amplifier is only used for determining resistance system speaker, and there are the unmatched problems of power；It cannot use
Power unit material is such as wasted at 8 ohm, 500W can only because there is impedance matching in pressure fixing system speaker
Use 130W.
Summary of the invention
The embodiment of the invention provides a kind of full load automatic gain mesh power amplifier, it is suitable for including hindering and determining calmly
Interior multiple systems are pressed in, can be when the resistance of access load be any value, Adaptive matching forward gain amplification factor,
To achieve the purpose that stable output power, make power amplifier steady operation in design power.
In order to solve the above-mentioned technical problem, the embodiment of the invention provides a kind of amplifications of full load automatic gain mesh power
Device, single-chip microcontroller, operational amplifying module, drive amplification module and measure voltage & including sequentially Electricity Federation；Wherein, described
Single-chip microcontroller is also connect with measure voltage &；The operational amplifying module includes linear optical coupling, and respectively with the line
Property optocoupler both ends connection the first operational amplifier and second operational amplifier；
The input signal of the operational amplifying module is by first operational amplifier and the drive amplification module
After the amplification of several multiples, output voltage is obtained；
After the measure voltage & carries out the decaying of identical multiple to the output voltage, obtain test voltage and
Test electric current；
The single-chip microcontroller calculates the resistance of access load, and output according to the test voltage and the test electric current
Power；
When output power is greater than rated power, by the benchmark electricity for lowering the second operational amplifier inverting input terminal
Pressure makes output power be equal to rated power；
When output power is less than or equal to rated power, using the test voltage as benchmark voltage；
When the first operational amplifier output terminal voltage is greater than reference voltage, the second operational amplifier output is high
The impedance of current potential, the linear optical coupling becomes smaller, while accordingly adjusting the amplification factor of first operational amplifier, makes described
One operational amplifier output terminal voltage is less than or equal to the reference voltage.
Further, the full load automatic gain mesh power amplifier, further includes:
When the resistance of access load becomes smaller, the reference voltage of the second operational amplifier inverting input terminal is lowered, is made
Output power is less than or equal to rated power.
Further, the multiple is to preset and adjustable, or carried out according to the impedance of the linear optical coupling adaptive
Adjustment.
Further, output power be less than or equal to rated power, and access load resistance it is constant when, reference voltage
It is constant.
Further, the impedance variations range of the linear optical coupling is 100 ohm to 10 megohms.
Further, the full load automatic gain mesh power amplifier, further includes switch power module, for whole
The power supply of machine is supplied；
After the switch power module powers on, the single-chip microcontroller carries out system detection in advance, it is ensured that system normal operation.
Further, the full load automatic gain mesh power amplifier, further includes:
After the switch power module powers on, the MUTE of the single-chip microcontroller exports high potential, transports at this time by described second
The voltage for calculating amplifier inverting input terminal is defaulted as reference voltage.
Further, the inverting input terminal of first operational amplifier and output end are connect with the linear optical coupling；
The output end of first operational amplifier respectively with the non-inverting input terminal of the second operational amplifier and described
The IN pin of drive amplification module connects；
The two of them pin of the single-chip microcontroller is connect with two input terminals of the second operational amplifier respectively；
The output end of the second operational amplifier is connect with the linear optical coupling；
The VS pin and FSACX pin of the drive amplification module and the same pin of the measure voltage & connect
It connects.
Further, the full load automatic gain mesh power amplifier further includes and the single-chip microcontroller Electricity Federation
Display screen and control keyboard, the display screen are used to show the calculated result of single-chip microcontroller, are also used to show the control keyboard
Operate response results.
Further, the full load automatic gain mesh power amplifier is suitable for hindering system and pressure fixing system surely,
When the resistance of access load is any value, the adaptive output power that adjusts is less than or equal to rated power.
Compared with the prior art, a kind of full load automatic gain mesh power amplifier provided by the invention is suitable for packet
Include the multiple systems including fixed resistance and level pressure, test voltage and test electric current of the single-chip microcontroller according to measure voltage &, meter
Calculate the resistance and output power of access load；When output power is greater than rated power, by lowering second operational amplifier
The reference voltage of inverting input terminal makes output power be equal to rated power；When output power is less than or equal to rated power, to survey
Examination voltage is benchmark voltage；When the first operational amplifier output terminal voltage is greater than reference voltage, second operational amplifier output
The impedance of high potential, linear optical coupling becomes smaller, and the corresponding amplification factor for adjusting the first operational amplifier keeps the first operational amplifier defeated
Outlet voltage is less than or equal to reference voltage.That is, Adaptive matching forward gain is put when the resistance of access load is any value
Big multiple makes power amplifier steady operation in design power to achieve the purpose that stable output power.
Detailed description of the invention
Fig. 1 is the circuit diagram of full load automatic gain mesh power amplifier in the embodiment of the present invention；
Wherein, the appended drawing reference in Figure of description is as follows:
M1, single-chip microcontroller；M2, PWM drive amplification chip；M3, measure voltage &；M4, switch power module；M5,
Operational amplifying module；M6, display screen；
U1-A, the first operational amplifier；U1-B, second operational amplifier；
OP1, linear optical coupling；INPUT, signal input part；
D1, the first unilateral diode；D2, the second unilateral diode；D3, third unilateral diode；D4, the 4th unidirectional two pole
Pipe；
R1, first resistor；R2, second resistance；R3,3rd resistor；R4, the 4th resistance；R5, the 5th resistance；R6, the 6th electricity
Resistance；
C1, the first electrolytic capacitor；C2, the second electrolytic capacitor；C3, third electrolytic capacitor；C4, the 4th electrolytic capacitor；C5,
Five electrolytic capacitors；C6, first capacitor；C7, the second capacitor；
Q6, the first field-effect tube；Q7, the second field-effect tube；
L1, the 7th resistance coil；L2, the 8th resistance coil；R7, the 7th resistance of the 7th resistance；R8, the 8th electricity of the 8th resistance
Resistance；R9, the 9th resistance of the 9th resistance.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order to meet when the resistance of access load is any value, Adaptive matching forward gain amplification factor, thus
Achieve the purpose that stable output power, makes power amplifier steady operation in design power.One embodiment of the present of invention mentions
A kind of full load automatic gain mesh power amplifier has been supplied, suitable for the multiple systems including fixed resistance and level pressure, including
The sequentially single-chip microcontroller M1, operational amplifying module M5, drive amplification module M2 and measure voltage & M3 of Electricity Federation.Wherein, institute
Single-chip microcontroller M1 is stated also to connect with measure voltage & M3；The operational amplifying module M5 includes linear optical coupling OP1, Yi Jifen
The the first operational amplifier U1-A and second operational amplifier U1-B not connect with the both ends of the linear optical coupling OP1.
Wherein, the inverting input terminal of the first operational amplifier U1-A and output end are connect with the linear optical coupling OP1；
The output end of the first operational amplifier U1-A respectively with the non-inverting input terminal of the second operational amplifier U1-B and described
The IN pin of drive amplification module M2 connects；The two of them pin of the single-chip microcontroller M1 respectively with the second operational amplifier
Two input terminals of U1-B connect；The output end of the second operational amplifier U1-B is connect with the linear optical coupling OP1；It is described
The VS pin and FSACX pin of drive amplification module M2 is connect with the same pin of the measure voltage & M3.
In order to describe the circuit of full load automatic gain mesh power amplifier in further detail, Fig. 1 is please referred to.
The operational amplifying module M5 further includes the first unilateral diode D1, the second unilateral diode D2, first resistor
R1, second resistance R2；The reference voltage of the single-chip microcontroller M1 adjusts the input terminal of control terminal and the first unilateral diode D1
Connection, the output end of the first unilateral diode D1 are connect with the inverting input terminal of the second operational amplifier U1-B；Institute
The output end for stating second operational amplifier U1-B is connect with the input terminal of the second unilateral diode D2, and described second unidirectional two
The output end of pole pipe D2 is connect by the first resistor R1 with the first end of the linear optical coupling OP1；The linear optical coupling OP1
Second end ground connection, the third end of the linear optical coupling OP1 and the 4th end and the second resistance R2 are connected in parallel to described the
The inverting input terminal of one operational amplifier U1-A, output end.
The operational amplifying module M5 further includes the first electrolytic capacitor C1, the second electrolytic capacitor C2, third electrolytic capacitor
C3, the 4th electrolytic capacitor C4, the 5th electrolytic capacitor C5,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6,
First capacitor C6；The anode of the first electrolytic capacitor C1 is connect with the output end of the first unilateral diode D1, and described the
The anode of two electrolytic capacitor C2 is connect with the output end of the second unilateral diode D2, and the first electrolytic capacitor C1's is negative
Pole, the second electrolytic capacitor C2 cathode ground connection；
The non-inverting input terminal of the second operational amplifier U1-B is electrolysed electricity by the 3rd resistor R3 and the third
Hold the cathode connection of C3, the anode of the third electrolytic capacitor C3 passes sequentially through the 4th resistance R4, the first capacitor C6
It is connected to the single-chip microcontroller M1；The anode of the output end of the first operational amplifier U1-A and the third electrolytic capacitor C3 are even
It connects, the output end of the first operational amplifier U1-A passes through the anode of the 6th resistance R6 and the 5th electrolytic capacitor C5
Connection, the cathode of the 5th electrolytic capacitor C5 are connect with the input terminal of the drive amplification module M2.
The inverting input terminal of the first operational amplifier U1-A passes through the 5th resistance R5 and the 4th electrolysis electricity
Holding the cathode connection of C4, the anode of the 4th electrolytic capacitor C4 is connect with one end of the signal input part INPUT, and described the
The other end connect and ground of the non-inverting input terminal of one operational amplifier U1-A and the signal input part INPUT.
The drive amplification module M2 includes drive amplification chip, the first field-effect tube Q6, the second field-effect tube Q7, first
Inductance coil L1, the second inductance coil L2, third unilateral diode D3, the 4th unilateral diode D4, the 7th resistance R7, the 8th electricity
Hinder R8, the 9th resistance R9.The first end of the drive amplification chip is connect with the control of Electric potentials end of the single-chip microcontroller M1, the drive
The second end of dynamic amplification chip is connected to the grid of the first field-effect tube Q6, the third list by the 7th resistance R7
It is connect to the input terminal of diode D3 with the grid of the first field-effect tube Q6, the output end of the third unilateral diode D3
It is connect with the second end of the drive amplification chip；The third end of the drive amplification chip passes through the 8th resistance R8 connection
To the grid of the second field-effect tube Q7, the input terminal of the 4th unilateral diode D4 is with the second field-effect tube Q7's
Grid connection, the output end of the 4th unilateral diode D4 are connect with the third end of the drive amplification chip；Described first
The source electrode of field-effect tube Q6 is connect with the drain electrode of the second field-effect tube Q7；4th end of the drive amplification chip passes through string
The the first inductance coil L1 and the 8th resistance R8 coil for joining connection are connected to the measure voltage & M3；Institute
The 5th end for stating drive amplification chip is connected to the measure voltage & M3 by the 9th resistance R9.
The drive amplification module M2 further includes the second capacitor C7, and one end of the second capacitor C7 is connected to described second
The other end of inductance coil L2, the second capacitor C7 are grounded.
The input signal of the operational amplifying module M5 passes through the first operational amplifier U1-A and the drive amplification
After the amplification of several multiples of module M2, output voltage is obtained.
After the measure voltage & M3 carries out the decaying of identical multiple to the output voltage, test voltage is obtained
With test electric current.
The single-chip microcontroller M1 calculates the resistance of access load and defeated according to the test voltage and the test electric current
Power out.
When output power is greater than rated power, by the base for lowering the second operational amplifier U1-B inverting input terminal
Quasi- voltage makes output power be equal to rated power.
When output power is less than or equal to rated power, using the test voltage as benchmark voltage.
When the first operational amplifier U1-A output end voltage is greater than reference voltage, the second operational amplifier
U1-B exports high potential, and the impedance of the linear optical coupling OP1 becomes smaller, while accordingly adjusting the first operational amplifier U1-A's
Amplification factor makes the first operational amplifier U1-A output end voltage be less than or equal to the reference voltage.
In order to which further the solution of the present invention is described in detail, hereafter to some currently preferred embodiments of the present invention
It is specifically described or illustrates.
In specific embodiment, benefit matching half amplifier of function is trained automatically with 500W full load, access load is 8 ohm
For.
After complete machine powering, single-chip microcontroller M1 enters preceding 2 seconds system detections, detects the work shape of measure voltage & M3
State, the MUTE of the single-chip microcontroller M1 exports high potential, the reference voltage (A of second operational amplifier U1-B inverting input terminal at this time
Point) it is 5V, drive amplification module M2 is in mute state, and power amplifier function is without output at this time.
Under the conditions of system no problem, the MUTE of the single-chip microcontroller M1 exports low potential, and the drive amplification module M2 is beaten
Silence switch is opened, power amplifier starts to work normally at this time.
When the input signal of signal input part INPUT is 2.5V, by the first operational amplifier U1-A and described
(multiple is to preset and adjustable, or according to the linear optical coupling OP1's for 40 times of signals amplification of drive amplification module M2
Impedance is adaptively adjusted), obtain output voltage (B point) 100V.
If the resistance (impedance) of LOAD access load is zero (load to be detected what LOAD do not take over), output
Voltage is after M340 times of the measure voltage & of decaying, test voltage 2V, and test current value is 0.At this point, single
Piece machine M1 is 2V according to test voltage and test current value is 0 to be calculated, and result is zero load, and then is shown and counted by display screen M6
Calculating result is zero load.
If LOAD access load is 8 ohm, tested through the measure voltage & M3, obtaining test voltage is
2V tests electric current 12.5A.The single-chip microcontroller M1 is 2V according to test voltage and test current value is that 12.5A is calculated, as a result
It is 8 ohm, and then shows that calculated result is 8 ohm by display screen M6.The output power of power amplifier reaches 1250W at this time,
It is more than seriously rated power 500W, at this moment the single-chip microcontroller M1 lowers the reference voltage most 1.6V of A point immediately (LOAD resistance value is not
In the case where change, this value will no longer change).
When the C point voltage of the first operational amplifier U1-A output is more than 1.6V, the second operational amplifier U1-
Output high potential, linear optical coupling OP1-A's B start to work at once, and the impedance of linear optical coupling OP1-B becomes smaller the (linear light at once
Coupling OP1 will be changed by 10 megohm of 100 ohmic resistance), by adjusting the amplification factor of the first operational amplifier U1-A, from
And C point is made to be less than or equal to 1.6V, so the output less than 63V is at after B point, rated output 500W power.
In a preferred embodiment, if the resistance value of LOAD access load becomes smaller, the single-chip microcontroller M1 will continue to turn A point down
Reference voltage, make whole system operating power be less than or equal to 500W.
In specific embodiment, or train benefit matching half amplifier of function automatically with 500W full load, access load is
For 32 ohm.
After complete machine powering, single-chip microcontroller M1 enters preceding 2 seconds system detections, detects the work shape of measure voltage & M3
State, the MUTE of the single-chip microcontroller M1 exports high potential, the reference voltage (A of second operational amplifier U1-B inverting input terminal at this time
Point) it is 5V, drive amplification module M2 is in mute state, and power amplifier function is without output at this time.
Under the conditions of system no problem, the MUTE of the single-chip microcontroller M1 exports low potential, and the drive amplification module M2 is beaten
Silence switch is opened, power amplifier starts to work normally at this time.
When the input signal of signal input part INPUT is 2.5V, by the first operational amplifier U1-A and described
(multiple is to preset and adjustable, or according to the linear optical coupling OP1's for 40 times of signals amplification of drive amplification module M2
Impedance is adaptively adjusted), obtain output voltage (B point) 100V.
If the resistance (impedance) of LOAD access load is zero (load to be detected what LOAD do not take over), output
Voltage is after M340 times of the measure voltage & of decaying, test voltage 2.5V, and test current value is 0.At this point,
Single-chip microcontroller M1 is 2V according to test voltage and test current value is 0 to be calculated, and result is zero load, and then is shown by display screen M6
Calculated result is zero load.
If LOAD access load is 32 ohm, tested through the measure voltage & M3, obtaining test voltage is
2V tests electric current 3.5A.The single-chip microcontroller M1 is 2V according to test voltage and test current value is that 3.5A is calculated, and result is
32 ohm, and then show that calculated result is 8 ohm by display screen M6.The output power of power amplifier reaches 330W at this time, small
In rated power 500W, at this moment the reference voltage of the uncomfortable A point of the single-chip microcontroller M1, reference voltage (A point) are still 5V (LOAD resistance value
In the case where constant, this value will no longer change), at this moment power amplifier is the work of level pressure mode, and C point voltage is set as 2.5V base
It is quasi-.
When C point voltage is more than 2.5V, the second operational amplifier U1-B exports high potential, linear optical coupling OP1- at once
A starts to work, and the impedance of linear optical coupling OP1-B becomes smaller at once, and (the linear optical coupling OP1 will be by 10 megohm of 100 ohmic resistance
Variation), by adjusting the amplification factor of the first operational amplifier U1-A, so that C point is less than or equal to 2.5V, so B
It is at the output less than 100V after point, is no more than the voltage rating of loudspeaker in this way.
In a preferred embodiment, if the resistance value of LOAD access load becomes smaller, the single-chip microcontroller M1 will continue to turn A point down
Reference voltage, make whole system operating power be less than or equal to 500W.
In a preferred embodiment, based on the above embodiment, the full load automatic gain mesh power amplifier,
Further include:
When the resistance of access load becomes smaller, the benchmark electricity of the second operational amplifier U1-B inverting input terminal is lowered
Pressure makes output power be less than or equal to rated power.
For example, same 500W power amplifier can export 2 ohm of 500W, 4 ohm can export 500W, and 8 ohm of energy are defeated
500W out, l00V broadcast system equally have 500W, can directly export and be not required to appropriate output transformer and can be used for determining resistance system sound
The problem of case, the various places such as pressure fixing system speaker, there is no impedance matchings.
It does not waste material in any situation, and .500W can use 500W in any condition, so that the power amplifier
It can be with a tractor serves several purposes.
According to foregoing description, the present embodiment be can satisfy when the resistance of access load is any value, Adaptive matching
Forward gain amplification factor makes power amplifier steady operation in design power to achieve the purpose that stable output power.
Preferably, the multiple is to preset and adjustable, or carried out according to the impedance of the linear optical coupling OP1 adaptive
Adjustment.
Preferably, it is less than or equal to rated power in output power, and when the resistance for accessing load is constant, reference voltage is permanent
It is fixed.
Preferably, the impedance variations range of the linear optical coupling OP1 is 100 ohm to 10 megohms.
Preferably, the full load automatic gain mesh power amplifier, further includes switch power module M4, for whole
The power supply of machine is supplied；
After the switch power module M4 is powered on, the single-chip microcontroller M1 carries out system detection in advance, it is ensured that system operation
Normally.
Preferably, the full load automatic gain mesh power amplifier, further includes:
After the switch power module M4 is powered on, the MUTE of the single-chip microcontroller M1 exports high potential, at this time by described the
The voltage of two operational amplifier U1-B inverting input terminals is defaulted as reference voltage.
Preferably, the full load automatic gain mesh power amplifier further includes and the Electricity Federation the single-chip microcontroller M1
Display screen M6 and control keyboard, the display screen M6 are used to show the calculated result of single-chip microcontroller M1, are also used to show the control
The operation response results of keyboard.
A kind of full load automatic gain mesh power amplifier provided by the invention is suitable for including fixed resistance and level pressure
Multiple systems, single-chip microcontroller M1 calculates access load according to the test voltage of measure voltage & M3 and test electric current
Resistance and output power；When output power is greater than rated power, by lowering second operational amplifier U1-B anti-phase input
The reference voltage at end makes output power be equal to rated power；When output power is less than or equal to rated power, it is with test voltage
Reference voltage；When the first operational amplifier U1-A output end voltage is greater than reference voltage, second operational amplifier U1-B output
The impedance of high potential, linear optical coupling OP1 becomes smaller, and the corresponding amplification factor for adjusting the first operational amplifier U1-A makes the first operation
Amplifier U1-A output end voltage is less than or equal to reference voltage.That is, when the resistance of access load is any value, adaptive
With forward gain amplification factor, to achieve the purpose that stable output power, power amplifier is made to stablize work in design power
Make.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (10)
1. a kind of full load automatic gain mesh power amplifier, which is characterized in that single-chip microcontroller, operation including sequentially Electricity Federation are put
Big module, drive amplification module and measure voltage &；Wherein, the single-chip microcontroller also connects with measure voltage &
It connects；The operational amplifying module includes linear optical coupling, and the first operation connecting respectively with the both ends of the linear optical coupling is put
Big device and second operational amplifier；
The input signal of the operational amplifying module is several by first operational amplifier and the drive amplification module
After the amplification of multiple, output voltage is obtained；
After the measure voltage & carries out the decaying of identical multiple to the output voltage, test voltage and test are obtained
Electric current；
The single-chip microcontroller calculates the resistance and output power of access load according to the test voltage and the test electric current；
When output power is greater than rated power, by lowering the reference voltage of the second operational amplifier inverting input terminal,
Output power is set to be equal to rated power；
When output power is less than or equal to rated power, using the test voltage as benchmark voltage；
When the first operational amplifier output terminal voltage is greater than reference voltage, the high electricity of second operational amplifier output
Position, the impedance of the linear optical coupling becomes smaller, while accordingly adjusting the amplification factor of first operational amplifier, makes described first
Operational amplifier output terminal voltage is less than or equal to the reference voltage.
2. full load automatic gain mesh power amplifier according to claim 1, which is characterized in that further include:
When the resistance of access load becomes smaller, the reference voltage of the second operational amplifier inverting input terminal is lowered, makes to export
Power is less than or equal to rated power.
3. full load automatic gain mesh power amplifier according to claim 1, which is characterized in that the multiple is pre-
First setting is simultaneously adjustable, or is adaptively adjusted according to the impedance of the linear optical coupling.
4. full load automatic gain mesh power amplifier according to claim 1, which is characterized in that small in output power
In or be equal to rated power, and access load resistance it is constant when, reference voltage is constant.
5. full load automatic gain mesh power amplifier according to claim 1, which is characterized in that the linear optical coupling
Impedance variations range be 100 ohm to 10 megohms.
6. full load automatic gain mesh power amplifier according to claim 1, which is characterized in that further include switch electricity
Source module, the power supply for complete machine are supplied；
After the switch power module powers on, the single-chip microcontroller carries out system detection in advance, it is ensured that system normal operation.
7. full load automatic gain mesh power amplifier according to claim 6, which is characterized in that further include:
After the switch power module powers on, the MUTE of the single-chip microcontroller exports high potential, at this time puts second operation
The voltage of big device inverting input terminal is defaulted as reference voltage.
8. full load automatic gain mesh power amplifier according to claim 1, which is characterized in that
The inverting input terminal and output end of first operational amplifier are connect with the linear optical coupling；
The output end of first operational amplifier respectively with the non-inverting input terminal of the second operational amplifier and the driving
The IN pin of amplification module connects；
The two of them pin of the single-chip microcontroller is connect with two input terminals of the second operational amplifier respectively；
The output end of the second operational amplifier is connect with the linear optical coupling；
The VS pin and FSACX pin of the drive amplification module are connect with the same pin of the measure voltage &.
9. full load automatic gain mesh power amplifier according to claim 1, which is characterized in that further include with it is described
The display screen and control keyboard of single-chip microcontroller Electricity Federation, the display screen are used to show the calculated result of single-chip microcontroller, are also used to show institute
State the operation response results of control keyboard.
10. -9 described in any item full load automatic gain mesh power amplifiers according to claim 1, which is characterized in that suitable
For hindering system and pressure fixing system surely, when the resistance of access load is any value, it is adaptive adjust output power be less than or
Equal to rated power.
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