CN215646736U - Amplifying circuit - Google Patents
Amplifying circuit Download PDFInfo
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- CN215646736U CN215646736U CN202121961563.9U CN202121961563U CN215646736U CN 215646736 U CN215646736 U CN 215646736U CN 202121961563 U CN202121961563 U CN 202121961563U CN 215646736 U CN215646736 U CN 215646736U
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Abstract
The utility model discloses an amplifying circuit which comprises an amplitude adjusting module, an in-phase amplifying module and a reverse-phase amplifying module, wherein the amplitude adjusting module can adjust the amplitude of a sinusoidal signal so that the amplitude of the sinusoidal signal is kept unchanged or smaller than the amplitude of the sinusoidal signal output by a sinusoidal signal generator, and the voltage difference between a first input end and a second input end of a load can be the difference between the sinusoidal signal after in-phase amplification and the sinusoidal signal after reverse-phase amplification instead of the difference between the sinusoidal signal after in-phase amplification and the ground voltage. Therefore, the voltage amplitude of the sinusoidal signal input to the load can be larger than the power supply voltage of the in-phase amplification module or the anti-phase amplification module without external power supply or transformer coupling, and further amplification of the sinusoidal signal is achieved.
Description
Technical Field
The utility model relates to the technical field of power electronics, in particular to an amplifying circuit.
Background
In the prior art, when sinusoidal signals are subjected to voltage and power amplification, the voltage amplitude of the sinusoidal signals cannot exceed the power supply voltage, when the sinusoidal signals with the voltage amplitude higher than the power supply voltage are required, the sinusoidal signals can be realized only by adding a power supply or coupling through a transformer, however, the cost is increased when the power supply is added, and when the frequency of the sinusoidal signals is increased by coupling the transformer, the distortion of the output sinusoidal signals is serious.
Therefore, how to amplify the voltage and power of the sinusoidal signal without increasing the power supply and without transformer coupling is a problem to be solved in the present application.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an amplifying circuit, which can enable the voltage amplitude of a sinusoidal signal input to a load to be larger than the power supply voltage of an in-phase amplifying module or an anti-phase amplifying module without external power supply or transformer coupling, and further amplify the sinusoidal signal.
To solve the above technical problem, the present invention provides an amplifying circuit, including:
the amplitude adjusting module is connected with the input end of the sinusoidal signal generator and is used for adjusting the amplitude of the sinusoidal signal output by the sinusoidal signal generator to be unchanged or reduced so as to output the sinusoidal signal after amplitude adjustment;
the in-phase amplification module is used for amplifying the sinusoidal signal after amplitude adjustment in an in-phase manner so as to output the sinusoidal signal after in-phase amplification;
the input end of the reverse phase amplification module is connected with the output end of the in-phase amplification module, the output end of the reverse phase amplification module is connected with the second input end of the load, and the reverse phase amplification module is used for performing reverse phase on the sine signal after in-phase amplification so as to output the sine signal after reverse phase amplification with a phase difference of 180 degrees with the sine signal after in-phase amplification, and the voltage between the first input end and the second input end of the load is the difference between the sine signal after in-phase amplification and the sine signal after reverse phase amplification.
Preferably, the amplitude adjustment module includes:
the potentiometer is used for adjusting the amplitude of the sinusoidal signal output by the sinusoidal signal generator to be unchanged or reduced by adjusting the resistance value of the potentiometer, and the voltage amplitude of the sinusoidal signal after amplitude adjustment is in negative correlation with the resistance value of the potentiometer;
and the buffer following amplifier is used for carrying out buffer following on the sinusoidal signal after the amplitude is adjusted so as to keep the sinusoidal signal input to a rear circuit consistent with the sinusoidal signal after the amplitude is adjusted and output by the potentiometer.
Preferably, the potentiometer is an analog potentiometer or a digital potentiometer.
Preferably, the in-phase amplifying module includes:
the input positive end is connected with the output end of the amplitude adjusting module, and the input negative end is connected with the same-phase amplifier through a first resistor, and is used for amplifying the voltage of the sinusoidal signal after amplitude adjustment based on the resistance value of the first resistor and the resistance value of a second resistor so as to output the sinusoidal signal after voltage amplification;
the in-phase push-pull circuit is used for performing power amplification on the sinusoidal signal after the voltage amplification so as to output the sinusoidal signal after in-phase amplification;
the first resistor and the second resistor arranged between the negative input end of the in-phase amplifier and the output end of the in-phase push-pull circuit are used for being matched with each other to enable the in-phase amplifier to amplify the voltage of the sinusoidal signal with the adjusted amplitude.
Preferably, the in-phase push-pull circuit includes:
the first switch tube is connected with the first power supply positive end at the first end, and connected with the output end of the in-phase amplifier at the control end;
the first end of the second switch tube is connected with the second end of the first switch tube, the second end of the second switch tube is connected with the negative end of the first power supply, and the control end of the second switch tube is connected with the output end of the non-inverting amplifier;
the second end of the first switch tube and the first end of the second switch tube are output ends of the in-phase push-pull circuit;
the first switch tube and the second switch tube are used for conducting or switching off based on the sinusoidal signal after voltage amplification so as to amplify the power of the sinusoidal signal after voltage amplification and output the sinusoidal signal after in-phase amplification.
Preferably, the inverting amplification module includes:
the inverting amplifier is connected with the input positive end of the inverting amplifier through a third resistor and the output end of the in-phase amplification module, and is used for inverting the voltage of the sinusoidal signal after in-phase amplification based on the resistance value of the third resistor and the resistance value of the fourth resistor so as to output the sinusoidal signal after voltage inversion;
the input end of the reverse-phase push-pull circuit is connected with the output end of the reverse-phase amplifier and is used for performing power amplification on the sinusoidal signal after voltage inversion so as to output the sinusoidal signal after reverse-phase amplification;
the third resistor and the fourth resistor arranged between the negative input end of the inverting amplifier and the output end of the inverting push-pull circuit are used for enabling the inverting amplifier to invert the voltage of the sine signal after in-phase amplification in a matching mode.
Preferably, the inverted push-pull circuit includes:
a third switching tube, the first end of which is connected with the positive end of the second power supply, and the control end of which is connected with the output end of the inverting amplifier;
a fourth switching tube, a first end of which is connected with the second end of the third switching tube, a second end of which is connected with the negative end of the second power supply, and a control end of which is connected with the output end of the inverting amplifier;
the second end of the third switching tube and the first end of the fourth switching tube are output ends of the reverse phase push-pull circuit;
the third switch tube and the fourth switch tube are used for conducting or switching off the sinusoidal signal after voltage phase reversal so as to amplify the power of the sinusoidal signal after voltage phase reversal and output the sinusoidal signal after voltage phase reversal amplification.
Preferably, also includes;
the alternating current blocking module is used for isolating the direct current signal in the sinusoidal signal after in-phase amplification so as to input the sinusoidal signal after in-phase amplification after blocking to the first input end of the load; and isolating the direct current signal in the sine signal after the inverting amplification so as to input the sine signal after the inverting amplification after the isolating to a second input end of the load.
Preferably, the ac blocking module includes a first capacitor and a second capacitor;
the first end of the first capacitor is a first input end of the alternating current blocking module, and the second end of the first capacitor is a first output end of the alternating current blocking module;
the first end of the second capacitor is a second input end of the alternating current blocking module, and the second end of the second capacitor is a second output end of the alternating current blocking module.
The application provides an amplifying circuit, including amplitude adjustment module, cophase amplification module and antiphase amplification module, amplitude adjustment module can adjust sinusoidal signal's amplitude to make sinusoidal signal's amplitude keep unchangeable or be less than sinusoidal signal's the amplitude of sinusoidal signal generator output, through the amplification of cophase amplification module and antiphase amplification module, can make the voltage difference between the first input of load and the second input be after the cophase amplification sinusoidal signal and antiphase amplify back sinusoidal signal's difference, and not after the cophase amplification sinusoidal signal and to the difference of ground voltage. Therefore, the voltage amplitude of the sinusoidal signal input to the load can be larger than the power supply voltage of the in-phase amplification module or the anti-phase amplification module without external power supply or transformer coupling, and further amplification of the sinusoidal signal is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an amplifying circuit according to the present invention;
fig. 2 is a schematic structural diagram of an amplifying circuit according to the present invention.
Detailed Description
The core of the utility model is to provide an amplifying circuit, which can enable the voltage amplitude of a sinusoidal signal input to a load to be larger than the power supply voltage of an in-phase amplifying module or an anti-phase amplifying module without external power supply or transformer coupling, thereby realizing the further amplification of the sinusoidal signal.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an amplifying circuit provided by the present invention, the circuit including:
the amplitude adjusting module 1 is connected with the input end of the sinusoidal signal generator and is used for adjusting the amplitude of the sinusoidal signal output by the sinusoidal signal generator to be unchanged or reduced so as to output the sinusoidal signal after amplitude adjustment;
the in-phase amplification module 2 is connected with the input end of the amplitude adjustment module 1 and the output end of the amplitude adjustment module 1, and is used for amplifying the sinusoidal signals after amplitude adjustment in phase to output the sinusoidal signals after in-phase amplification;
and the reverse-phase amplification module 3 is used for performing reverse phase on the in-phase amplified sinusoidal signal to output a reverse-phase amplified sinusoidal signal with a phase difference of 180 degrees with the in-phase amplified sinusoidal signal, so that the voltage between the first input end and the second input end of the load is the difference between the in-phase amplified sinusoidal signal and the reverse-phase amplified sinusoidal signal.
In the embodiment, the applicant considers that the amplifying circuit in the prior art can only amplify the input voltage to the magnitude of the own power voltage, and if a larger voltage is provided for the load, a power supply needs to be additionally arranged or a transformer coupling needs to be adopted, so that the amplifying circuit amplifies the input voltage to be larger than the voltage of the own power supply, however, the cost is increased by additionally arranging the power supply or arranging the transformer coupling, and when the frequency of the input voltage is higher, the voltage output by the transformer coupling generates larger distortion, which causes an abnormality in the subsequent driving of the load, and more likely affects the normal operation of the load.
In order to solve the above technical problem, an amplitude adjusting module 1, an in-phase amplifying module 2 and an anti-phase amplifying module 3 are provided in the present application, and a user can adjust the amplitude of an input sinusoidal signal by adjusting the amplitude adjusting module 1, however, the amplitude adjusting module 1 can only adjust the amplitude of the sinusoidal signal to be smaller than the amplitude of the sinusoidal signal output by the sinusoidal signal generator or keep the amplitude of the sinusoidal signal output by the sinusoidal signal generator unchanged. Subsequently, the in-phase amplification module 2 performs in-phase amplification on the amplitude-adjusted sinusoidal signal output by the amplitude adjustment module 1, that is, the phase of the amplitude-adjusted sinusoidal signal is not changed, but the voltage of the amplitude-adjusted sinusoidal signal can be maximally adjusted to the power supply voltage of the sinusoidal signal, and the in-phase amplified sinusoidal signal is input to the first input end of the load and the input end of the reverse-phase amplification module 3. The reverse-phase amplification module 3 reverses the phase of the sine signal amplified in the same phase, but the amplitude of the sine signal is not changed, so that the sine signal amplified in the reverse phase is input to the second input end of the load.
Based on this, after the in-phase amplified sinusoidal signal and the anti-phase amplified sinusoidal signal are respectively input to the load in the present application, the voltage difference between the first input end and the second input end of the load is the difference between the in-phase amplified sinusoidal signal and the anti-phase amplified sinusoidal signal, so that the maximum voltage between the first input end and the second input end of the load is greater than the power supply voltage of the in-phase amplification module 2 or the anti-phase amplification module 3, and further amplification of the voltage of the sinusoidal signal is realized.
It should be noted that, in the present application, the in-phase amplification module 2 not only amplifies the voltage of the sinusoidal signal after the amplitude adjustment, but also amplifies the power of the sinusoidal signal after the amplitude adjustment; in a similar way, the reverse amplification module also amplifies the power of the sine signal amplified in the same phase.
In summary, the application can amplify the sinusoidal signal input to the load with a voltage amplitude larger than the power voltage of the in-phase amplification module 2 or the anti-phase amplification module 3 without an external power supply or transformer coupling, thereby further amplifying the sinusoidal signal.
On the basis of the above-described embodiment:
as a preferred embodiment, the amplitude adjustment module 1 includes:
the potentiometer P1 is used for adjusting the amplitude of the sinusoidal signal output by the sinusoidal signal generator to be unchanged or reduced by adjusting the resistance value of the potentiometer P1, and the voltage amplitude of the sinusoidal signal after amplitude adjustment is in negative correlation with the resistance value of the potentiometer P1;
and the buffer following amplifier U1-A with the input end connected with the output end of the potentiometer P1 is used for carrying out buffer following on the sinusoidal signal after the amplitude adjustment, so that the sinusoidal signal input to a rear circuit and the sinusoidal signal after the amplitude adjustment output by the potentiometer P1 are kept consistent.
Referring to fig. 2, fig. 2 is a schematic structural diagram of an amplifying circuit according to the present invention.
The amplitude adjusting module 1 in this embodiment includes a potentiometer P1 and a buffer follower amplifier U1-a, wherein the adjustment of the amplitude of the sinusoidal signal can be realized by adjusting the resistance of the potentiometer P1 through the moving contact CW, when the resistance of the potentiometer P1 is zero, the amplitude of the sinusoidal signal is unchanged and is still the amplitude of the sinusoidal signal output by the sinusoidal signal generator, and when the resistance value of the resistor of the potentiometer P1 is the maximum resistance value, the amplitude of the sinusoidal signal is the minimum value, and therefore, the amplitude of the sinusoidal signal output by the potentiometer P1 and the resistance value of the resistor of the potentiometer P1 are in negative correlation.
In addition, in order to solve the technical problem, the applicant considers that when the resistance value of the circuit behind the potentiometer P1 is smaller than that of the potentiometer P1, the amplitude of the sinusoidal signal input to the circuit behind the potentiometer P1 is smaller than that of the sinusoidal signal output by the potentiometer P1, for example, when only a power supply and a load are arranged in the circuit, and the internal resistance of the power supply is larger than that of the load, more voltage output by the power supply is added to the internal resistance of the power supply, so that the voltage added to the load is smaller than the voltage of the power supply, the buffer following amplifier U1-a is further arranged behind the potentiometer P1 in the application, and the sinusoidal signal output by the potentiometer P1 can be buffer-followed to ensure that the sinusoidal signal output to the circuit behind the potentiometer P1 is consistent with the sinusoidal signal output by the potentiometer P1. Accordingly, when a power supply, a buffer follower amplifier U1-A and a load are provided in the circuit, the buffer follower amplifier U1-A can ensure that the voltage applied to the load is the supply voltage.
By adjusting the amplitude of the sinusoidal signal, the amplitude of the sinusoidal signal input to the load can meet the load condition after subsequent amplification.
As a preferred embodiment, the potentiometer P1 is an analog potentiometer or a digital potentiometer.
The potentiometer P1 in this embodiment is an analog potentiometer whose resistance can be controlled by the user to be any value within its own resistance range, or a digital potentiometer whose resistance needs to be set to a minimum accuracy so as to adjust its resistance according to the set accuracy.
Based on this, the present application does not limit what kind of potentiometer P1 is specifically, as long as the adjustment of the sinusoidal signal can be achieved.
As a preferred embodiment, the in-phase amplifying module 2 includes:
the input positive end is connected with the output end of the amplitude adjusting module 1, and the input negative end is grounded through a first resistor R1, namely a non-inverting amplifier U1-B, and is used for amplifying the voltage of the sinusoidal signal after amplitude adjustment based on the resistance value of the first resistor R1 and the resistance value of a second resistor R2 so as to output the sinusoidal signal after voltage amplification;
the in-phase push-pull circuit is connected with the input end of the in-phase amplifier U1-B and is used for carrying out power amplification on the sinusoidal signal after voltage amplification so as to output the sinusoidal signal after in-phase amplification;
the first resistor R1 and the second resistor R2 arranged between the negative input terminal of the in-phase amplifier U1-B and the output terminal of the in-phase push-pull circuit are used for enabling the in-phase amplifier U1-B to amplify the voltage of the sinusoidal signal after amplitude adjustment in a matching mode.
In the in-phase amplifier module 2 of this embodiment, the amplification factor of the amplitude-adjusted sinusoidal signal amplified by the in-phase amplifier U1-B is determined by the ratio of the resistance of the second resistor R2 divided by the resistance of the first resistor R1, and the amplification factor is in positive correlation with the ratio of the resistance of the second resistor R2 divided by the resistance of the first resistor R1, so that the amplification factor of the amplitude-adjusted sinusoidal signal amplified by the voltage can be adjusted by adjusting the resistances of the second resistor R2 and the first resistor R1.
As a preferred embodiment, the in-phase push-pull circuit includes:
the first switch tube Q1 is connected with the first power supply positive end at the first end, and the control end of the first switch tube Q1 is connected with the output end of the non-inverting amplifier U1-B;
the second switching tube Q2 is connected with the second end of the first switching tube Q1 at the first end, connected with the negative end of the first power supply at the second end and connected with the output end of the non-inverting amplifier U1-B at the control end;
the second end of the first switch tube Q1 and the first end of the second switch tube Q2 are output ends of the in-phase push-pull circuit;
the first switch tube Q1 and the second switch tube Q2 are used for conducting or switching off based on the voltage-amplified sinusoidal signal, so as to perform power amplification on the voltage-amplified sinusoidal signal and output an in-phase amplified sinusoidal signal.
The in-phase push-pull circuit in this embodiment includes a first switch Q1 and a second switch Q2, and the voltage-amplified sinusoidal signal can control the first switch Q1 and the second switch Q2 to be turned on or off, so that the first switch Q1 and the second switch Q2 amplify the power of the voltage-amplified sinusoidal signal to output the final in-phase amplified sinusoidal signal.
In addition, in the present application, the feedback end of the non-inverting amplifier U1-B, that is, the second resistor R2, is disposed at the negative input end of the non-inverting amplifier U1-B, that is, the output end of the non-inverting push-pull circuit, that is, the second resistor R2 is disposed between the second end of the first switch tube Q1 and the first end of the second switch tube Q2, and the negative input end of the non-inverting amplifier U1-B, so that it can be ensured that the voltage signal output by the non-inverting amplifier U1-B does not turn off the first switch tube Q1 and the second switch tube Q2, thereby avoiding cross-over distortion, and ensuring the stability of the waveform of the output non-inverting amplified sinusoidal signal.
As a preferred embodiment, the inverting amplification block 3 includes:
the input positive end is grounded, and the input negative end is connected with the inverting amplifier U1-C through the third resistor R3 and the output end of the in-phase amplification module 2, so that the voltage of the sinusoidal signal after in-phase amplification is inverted based on the resistance value of the third resistor R3 and the resistance value of the fourth resistor R4 to output the sinusoidal signal after voltage inversion;
the input end of the reverse-phase push-pull circuit is connected with the output end of the reverse-phase amplifier U1-C and is used for performing power amplification on the sinusoidal signal after voltage reverse phase so as to output the sinusoidal signal after reverse-phase amplification;
the third resistor R3 and a fourth resistor R4 arranged between the negative input terminal of the inverting amplifier U1-C and the output terminal of the inverting push-pull circuit are used for enabling the inverting amplifier U1-C to invert the voltage of the sine signal amplified in phase.
The negative input terminal of the inverting amplification module 3 in this embodiment is connected to the output terminal of the in-phase amplification module 2 through the third resistor R3, and the third resistor R3 and the fourth resistor R4 are set to have the same resistance value, so that it can be ensured that only the in-phase amplified sinusoidal signal is inverted, and then the power of the in-phase amplified sinusoidal signal is amplified by the inverting push-pull circuit. To ensure the subsequent normal driving of the load.
As a preferred embodiment, the inverted push-pull circuit includes:
the third switching tube Q3 is connected with the first end and the positive end of the second power supply, and the control end of the third switching tube Q3 is connected with the output end of the inverting amplifier U1-C;
the fourth switching tube Q4 is connected with the second end of the third switching tube Q3 at the first end, connected with the negative end of the second power supply at the second end and connected with the output end of the inverting amplifier U1-C at the control end;
the second end of the third switch tube Q3 and the first end of the fourth switch tube Q4 are output ends of the reverse phase push-pull circuit;
the third switch tube Q3 and the fourth switch tube Q4 are used for conducting or switching off based on the sinusoidal signal after voltage phase inversion, so as to perform power amplification on the sinusoidal signal after voltage phase inversion and output the sinusoidal signal after voltage phase inversion and amplification.
The reverse-phase push-pull circuit in this embodiment includes a third switch tube Q3 and a fourth switch tube Q4, and the sinusoidal signal after voltage phase inversion can control the third switch tube Q3 and the fourth switch tube Q4 to turn on or off, so that the third switch tube Q3 and the fourth switch tube Q4 amplify the power of the sinusoidal signal after voltage phase inversion to output the final sinusoidal signal after phase inversion amplification.
In addition, the feedback end of the inverting amplifier U1-C, that is, the fourth resistor R4, in this application connects the negative input terminal of the inverting amplifier U1-C with the output terminal of the inverting push-pull circuit, that is, the fourth resistor R4 is disposed between the second end of the third switch tube Q3 and the first end of the fourth switch tube Q4 and the negative input terminal of the inverting amplifier U1-C, so that it can be ensured that the voltage signal output by the inverting amplifier U1-C prevents the third switch tube Q3 and the fourth switch tube Q4 from being turned off, thereby avoiding crossover distortion and ensuring the stability of the waveform of the output in-phase amplified sinusoidal signal.
It should be further noted that three amplifiers in the present application can be replaced by a multi-channel amplifier, and one multi-channel amplifier can realize buffer following, in-phase amplification and reverse amplification, thereby saving cost.
As a preferred embodiment, further comprising;
the alternating current blocking module is used for isolating the direct current signal in the sine signal after the in-phase amplification so as to input the sine signal after the blocking of the direct current signal after the in-phase amplification to the first input end of the load; and isolating the direct current signal in the sine signal after the inverting amplification so as to input the sine signal after the inverting amplification after the isolating to the second input end of the load.
The applicant considers that when the in-phase amplification module 2 and the anti-phase amplification module 3 respectively amplify sinusoidal signals, because the in-phase amplification module 2 and the anti-phase amplification module 3 are respectively provided with a direct-current power supply, the in-phase amplified sinusoidal signals and the anti-phase amplified sinusoidal signals may be doped with direct-current components, which may cause the waveforms of the sinusoidal signals input to the load and the sinusoidal signals output by the sinusoidal signal transmitter to be inconsistent, and may cause the subsequent failure of ideal control for the load.
In order to solve the technical problem, the alternating current blocking module is further arranged, and can isolate the direct current signal in the in-phase amplified sinusoidal signal and the reverse-phase amplified sinusoidal signal, so that the waveforms of the in-phase amplified sinusoidal signal and the reverse-phase amplified sinusoidal signal input into the load cannot be changed greatly, and good power supply to the load is guaranteed.
As a preferred embodiment, the ac blocking module includes a first capacitor C1 and a second capacitor C2;
the first end of the first capacitor C1 is a first input end of the ac blocking module, and the second end is a first output end of the ac blocking module;
the first end of the second capacitor C2 is the second input end of the ac blocking module, and the second end is the second output end of the ac blocking module.
The ac blocking modules in this embodiment are the first capacitor C1 and the second capacitor C2, and the first capacitor C1 and the second capacitor C2 are capacitive devices, and the voltage across the capacitive devices cannot change instantaneously, so that the dc signals in the in-phase amplified sinusoidal signal and the anti-phase amplified sinusoidal signal can be isolated, and the waveforms of the in-phase amplified sinusoidal signal and the anti-phase amplified sinusoidal signal can be maintained.
In addition, the first capacitor C1 and the second capacitor C2 have the characteristics of low cost and simple structure.
Of course, the application does not limit the specific structure of the ac blocking module.
In addition, the first input end and the second input end of the load are isolated through the first capacitor C1 and the second capacitor C2 with the same parameters, and the loss and the phase shift consistency of the two capacitors are guaranteed. Since the sinusoidal signals at the first and second inputs of the load are in opposite phase, the amplitude of the signal at the load is OU1-OUT 2-2 OUT 1. The power supply in the in-phase amplification module 2 and the anti-phase amplification module 3 is powered to +/-15V, and in the case of no difference, the maximum range of the amplitude of the output signal at the end OUT1 of the first capacitor C1 is rail-to-rail +/-13V due to the voltage drop of a switching tube in the push-pull circuit. After reverse differential, the amplitude range of signals at two ends of the load is +/-26V and exceeds the supply voltage of the power supply.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. An amplification circuit, comprising:
the amplitude adjusting module is connected with the input end of the sinusoidal signal generator and is used for adjusting the amplitude of the sinusoidal signal output by the sinusoidal signal generator to be unchanged or reduced so as to output the sinusoidal signal after amplitude adjustment;
the in-phase amplification module is used for amplifying the sinusoidal signal after amplitude adjustment in an in-phase manner so as to output the sinusoidal signal after in-phase amplification;
the input end of the reverse phase amplification module is connected with the output end of the in-phase amplification module, the output end of the reverse phase amplification module is connected with the second input end of the load, and the reverse phase amplification module is used for performing reverse phase on the sine signal after in-phase amplification so as to output the sine signal after reverse phase amplification with a phase difference of 180 degrees with the sine signal after in-phase amplification, and the voltage between the first input end and the second input end of the load is the difference between the sine signal after in-phase amplification and the sine signal after reverse phase amplification.
2. The amplification circuit of claim 1, wherein the amplitude adjustment module comprises:
the potentiometer is used for adjusting the amplitude of the sinusoidal signal output by the sinusoidal signal generator to be unchanged or reduced by adjusting the resistance value of the potentiometer, and the voltage amplitude of the sinusoidal signal after amplitude adjustment is in negative correlation with the resistance value of the potentiometer;
and the buffer following amplifier is used for carrying out buffer following on the sinusoidal signal after the amplitude is adjusted so as to keep the sinusoidal signal input to a rear circuit consistent with the sinusoidal signal after the amplitude is adjusted and output by the potentiometer.
3. The amplification circuit of claim 2, wherein the potentiometer is an analog potentiometer or a digital potentiometer.
4. The amplification circuit of claim 1, wherein the in-phase amplification module comprises:
the input positive end is connected with the output end of the amplitude adjusting module, and the input negative end is connected with the same-phase amplifier through a first resistor, and is used for amplifying the voltage of the sinusoidal signal after amplitude adjustment based on the resistance value of the first resistor and the resistance value of a second resistor so as to output the sinusoidal signal after voltage amplification;
the in-phase push-pull circuit is used for performing power amplification on the sinusoidal signal after the voltage amplification so as to output the sinusoidal signal after in-phase amplification;
the first resistor and the second resistor arranged between the negative input end of the in-phase amplifier and the output end of the in-phase push-pull circuit are used for being matched with each other to enable the in-phase amplifier to amplify the voltage of the sinusoidal signal with the adjusted amplitude.
5. The amplification circuit of claim 4, wherein the in-phase push-pull circuit comprises:
the first switch tube is connected with the first power supply positive end at the first end, and connected with the output end of the in-phase amplifier at the control end;
the first end of the second switch tube is connected with the second end of the first switch tube, the second end of the second switch tube is connected with the negative end of the first power supply, and the control end of the second switch tube is connected with the output end of the non-inverting amplifier;
the second end of the first switch tube and the first end of the second switch tube are output ends of the in-phase push-pull circuit;
the first switch tube and the second switch tube are used for conducting or switching off based on the sinusoidal signal after voltage amplification so as to amplify the power of the sinusoidal signal after voltage amplification and output the sinusoidal signal after in-phase amplification.
6. The amplification circuit of claim 1, wherein the inverting amplification module comprises:
the inverting amplifier is connected with the input positive end of the inverting amplifier through a third resistor and the output end of the in-phase amplification module, and is used for inverting the voltage of the sinusoidal signal after in-phase amplification based on the resistance value of the third resistor and the resistance value of the fourth resistor so as to output the sinusoidal signal after voltage inversion;
the input end of the reverse-phase push-pull circuit is connected with the output end of the reverse-phase amplifier and is used for performing power amplification on the sinusoidal signal after voltage inversion so as to output the sinusoidal signal after reverse-phase amplification;
the third resistor and the fourth resistor arranged between the negative input end of the inverting amplifier and the output end of the inverting push-pull circuit are used for enabling the inverting amplifier to invert the voltage of the sine signal after in-phase amplification in a matching mode.
7. The amplification circuit of claim 6, wherein the inverted push-pull circuit comprises:
a third switching tube, the first end of which is connected with the positive end of the second power supply, and the control end of which is connected with the output end of the inverting amplifier;
a fourth switching tube, a first end of which is connected with the second end of the third switching tube, a second end of which is connected with the negative end of the second power supply, and a control end of which is connected with the output end of the inverting amplifier;
the second end of the third switching tube and the first end of the fourth switching tube are output ends of the reverse phase push-pull circuit;
the third switch tube and the fourth switch tube are used for conducting or switching off the sinusoidal signal after voltage phase reversal so as to amplify the power of the sinusoidal signal after voltage phase reversal and output the sinusoidal signal after voltage phase reversal amplification.
8. The amplification circuit of any one of claims 1-7, further comprising;
the alternating current blocking module is used for isolating the direct current signal in the sinusoidal signal after in-phase amplification so as to input the sinusoidal signal after in-phase amplification after blocking to the first input end of the load; and isolating the direct current signal in the sine signal after the inverting amplification so as to input the sine signal after the inverting amplification after the isolating to a second input end of the load.
9. The amplification circuit of claim 8, wherein the ac blocking module comprises a first capacitor and a second capacitor;
the first end of the first capacitor is a first input end of the alternating current blocking module, and the second end of the first capacitor is a first output end of the alternating current blocking module;
the first end of the second capacitor is a second input end of the alternating current blocking module, and the second end of the second capacitor is a second output end of the alternating current blocking module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121961563.9U CN215646736U (en) | 2021-08-19 | 2021-08-19 | Amplifying circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121961563.9U CN215646736U (en) | 2021-08-19 | 2021-08-19 | Amplifying circuit |
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| CN215646736U true CN215646736U (en) | 2022-01-25 |
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