阅读说明：本技术 动态同步伺服直流电源 (Dynamic synchronous servo direct-current power supply ) 是由 陈相兴 于 2019-09-26 设计创作，主要内容包括：本发明公开了一种动态同步伺服直流电源,包括：用于与市电连接的降压整流滤波电路；用于直流稳压的串联稳压电路；用于反相放大音频信号的反相比例放大电路；用于连接反相比例放大电路和串联稳压电路的信号耦合电路；用于连接音频信号源和连接串联稳压电路输出端的音频信号放大器；用于提供音频信号的音频信号源；所述串联稳压电路分别与降压整流滤波电路、信号耦合电路和音频信号放大器连接,所述反相比例放大电路分别与信号耦合电路和音频信号源连接；所述音频信号源分别与反相比例放大电路和音频信号放大器连接；本发明彻底解决了传统稳压电源向音频信号放大器供电时出现的各种杂乱的不同频率和波形的纹波干扰的技术问题。(The invention discloses a dynamic synchronous servo direct-current power supply, which comprises: the voltage reduction rectification filter circuit is used for being connected with a mains supply; a series voltage stabilizing circuit for DC voltage stabilization; an inverting proportional amplifying circuit for inverting and amplifying the audio signal; the signal coupling circuit is used for connecting the inverse proportion amplifying circuit and the series voltage stabilizing circuit; the audio signal amplifier is used for connecting an audio signal source and connecting the output end of the series voltage stabilizing circuit; an audio signal source for providing an audio signal; the series voltage stabilizing circuit is respectively connected with the voltage reduction rectification filter circuit, the signal coupling circuit and the audio signal amplifier, and the inverse proportion amplifying circuit is respectively connected with the signal coupling circuit and the audio signal source; the audio signal source is respectively connected with the inverse proportion amplifying circuit and the audio signal amplifier; the invention thoroughly solves the technical problem of various disordered ripple interferences with different frequencies and waveforms when the traditional voltage-stabilized power supply supplies power to the audio signal amplifier.)

1. Dynamic synchronous servo direct current power supply, its characterized in that includes:

the voltage reduction rectification filter circuit (1) is used for being connected with a mains supply;

a series voltage stabilizing circuit (2) for DC voltage stabilization;

an inverting proportional amplifying circuit (5) for inverting-amplifying the audio signal;

a signal coupling circuit (6) for connecting the inverse proportion amplifying circuit and the series voltage stabilizing circuit;

the audio signal amplifier (3) is used for connecting an audio signal source and connecting the output end of the series voltage stabilizing circuit;

an audio signal source (4) for providing an audio signal;

the series voltage stabilizing circuit (2) is respectively connected with the voltage reduction rectification filter circuit (1), the signal coupling circuit (6) and the audio signal amplifier (3), and the inverse proportion amplifying circuit (5) is respectively connected with the signal coupling circuit (6) and the audio signal source (4); the audio signal source (4) is connected with the audio signal amplifier (3);

the voltage-reducing rectification filter circuit (1) processes the input mains supply voltage into positive and negative double direct current voltages which are input into the series voltage-stabilizing circuit (2), the anti-phase proportional amplifying circuit (5) is used for carrying out anti-phase amplification on an audio signal input from the audio signal source (4) and then inputting the audio signal to the signal coupling circuit (6), the signal coupling circuit (6) is used for respectively inputting the audio signal after the anti-phase amplification to a positive output voltage sampling and amplifying input end of the series voltage stabilizing circuit (2) and a negative output voltage sampling and amplifying input end of the series voltage stabilizing circuit (2), the audio signal after the anti-phase amplification is used for modulating the output voltage of the series voltage stabilizing circuit (2), the series voltage stabilizing circuit (2) is used for supplying the modulated output voltage to the audio signal amplifier (3), and the waveform and the frequency of the ripple wave of the modulated output voltage are completely synchronous with the waveform and the frequency of the output signal of the audio signal source (4).

2. The dynamically synchronized servo dc power supply of claim 1, wherein:

the step-down rectification filter circuit (1): the transformer T1, the rectifier bridge Z1, the capacitor C1 and the capacitor C2 are included;

the series voltage stabilizing circuit (2): the positive voltage circuit comprises a positive voltage circuit and a negative voltage circuit, wherein the positive voltage circuit comprises a voltage stabilizing diode ZD1, a voltage stabilizing diode ZD2, a voltage stabilizing diode ZD3, a field effect transistor Q1, a triode Q2, a triode Q3, a resistor R1, a resistor R2, a resistor R3, a capacitor C3, a constant current diode CRD1, a potentiometer RP1 and a positive output end + Vout; the negative voltage circuit comprises a voltage stabilizing diode ZD4, a voltage stabilizing diode ZD5, a voltage stabilizing diode ZD6, a field effect transistor Q6, a triode Q4, a triode Q5, a resistor R4, a resistor R5, a resistor R6, a capacitor C4, a constant current diode CRD2, a potentiometer RP2 and a negative output end-Vout;

the inverse proportional amplifying circuit (5): the circuit comprises a capacitor C7, a resistor R7, a resistor R8 and an operational amplifier U1;

the signal coupling circuit (6): the device comprises a potentiometer RP3, a potentiometer RP4, a capacitor C5 and a capacitor C6.

3. The dynamically synchronized servo dc power supply of claim 2, wherein:

in the step-down rectification filter circuit (1): the primary side of a transformer T1 is connected with a mains supply, the secondary side of the transformer T1 is connected with an alternating current input end of a rectifier bridge Z1, the central point of the secondary side of the transformer T1 is grounded, the positive output end of the rectifier bridge Z1 is connected with the positive electrode of a capacitor C1, the negative electrode of a capacitor C1 is grounded, the negative output end of the rectifier bridge Z1 is connected with the negative electrode of the capacitor C2, and the positive electrode of a capacitor C2 is grounded;

in a positive voltage circuit of the series voltage stabilizing circuit (2): the anode of a constant current diode CRD1 is connected with the anode of a capacitor C1 of the buck rectifier filter circuit 1, the cathode of the constant current diode CRD1 is respectively connected with the anode of a zener diode ZD1, the G pole of a field effect tube Q1 and the C pole of a triode Q3, the D pole of the field effect tube Q1 is connected with the anode of a capacitor C1 of the buck rectifier filter circuit (1), the S pole of the field effect tube Q1 is connected with the positive output end + Vout, the cathode of a zener diode ZD1 is connected with the cathode of a ZD2, the anode of a ZD2 is connected with the positive output end + Vout, one end of a resistor R1 is respectively connected with the C pole of a triode Q2 and the anode of a capacitor C84 of the buck rectifier filter circuit (1), the other end of the resistor R1 is respectively connected with the anode of a capacitor C3, the cathode of a ZD3 and the B pole of a triode Q2, the cathode of a capacitor C5 is grounded, the anode of a ZD 3723 and one end of a resistor R583757324, the other end of the resistor R3 is connected with the E pole of the triode Q2 and the E pole of the triode Q3 respectively, one end of the resistor R2 is connected with the positive output end + Vout, the other end of the resistor R2 is connected with the B pole of the triode Q3, one end of the potentiometer RP1 and one end of the potentiometer RP3 of the signal coupling circuit (6) respectively, and the other end of the potentiometer RP1 is grounded;

in the negative voltage circuit of the series voltage stabilizing circuit (2): the cathode of a constant current diode CRD2 is connected with the cathode of a capacitor C2 of a buck rectification filter circuit (1), the anode of a constant current diode CRD2 is respectively connected with the anode of a zener diode ZD5, the G pole of a field effect tube Q6 and the C pole of a triode Q5, the D pole of a field effect tube Q6 is connected with the cathode of a capacitor C2 of the buck rectification filter circuit (1), the S pole of a field effect tube Q6 is connected with a negative output end Vout, the cathode of a zener diode ZD5 is connected with the cathode of a zener diode ZD6, the anode of a zener diode 6 is connected with the negative output end Vout, one end of a resistor R5 is respectively connected with the C pole of a triode Q4 and the cathode of a capacitor C2 of the buck rectification filter circuit (1), the other end of a resistor R5 is respectively connected with the cathode of a capacitor C4, the anode of a zener diode ZD4 and the B pole of a triode Q4, the anode of a capacitor C4 is grounded, the cathode of a, one end of a resistor R4 is grounded, the other end of the resistor R4 is respectively connected with the E pole of the triode Q4 and the E pole of the triode Q5, one end of a resistor R6 is connected with the negative output end-Vout, the other end of a resistor R6 is respectively connected with the B pole of the triode Q5, one end of a potentiometer RP2 and one end of a potentiometer RP4 of the signal coupling circuit (6), and the other end of the potentiometer RP2 is grounded;

in the inverting proportional amplifying circuit (5): one end of a resistor R8 is connected with an audio signal input end Vin, the other end of a resistor R8 is respectively connected with an inverting input end of an operational amplifier U1, one end of a resistor R7 and one end of a capacitor C7, a non-inverting input end of an operational amplifier U1 is grounded, and an output end of an operational amplifier U1 is respectively connected with the other end of a resistor R7, the other end of a capacitor C7, one end of a capacitor C5 of a signal coupling circuit (6) and one end of a capacitor C6 of the signal coupling circuit (6);

in the signal coupling circuit (6): the other end of the capacitor C5 is connected with the other end of the potentiometer RP3, and the other end of the capacitor C6 is connected with the other end of the potentiometer RP 4;

the audio signal amplifier (3) is respectively connected with the positive output end + Vout of the series voltage stabilizing circuit (2) and the negative output end-Vout of the series voltage stabilizing circuit (2);

the audio signal source (4) is connected with an audio signal input end Vin of the inverting proportion amplifying circuit (5).

Technical Field

The invention relates to the field of direct current power supplies for supplying power to audio signal amplifiers, in particular to a dynamic synchronous servo direct current power supply.

Background

For electronic appliances, most of the electronic appliances can work only by a direct-current power supply, and a plurality of application occasions have certain requirements on the voltage stability of the direct-current power supply, and the current direct-current voltage stabilization technology has three types: series voltage regulation, parallel voltage regulation and switching voltage regulation. The three types of voltage-stabilized power supplies have different circuit structure forms, but the principles are different, namely discrete components are adopted, integrated chips are adopted, and the discrete components and the integrated chips are mixed for use.

The advantages and the disadvantages of the current three types of direct current voltage stabilization technologies are introduced in more detail:

① series voltage-stabilized power supply, which is to connect a controllable adjusting element in series to divide the input DC voltage to realize voltage stabilization, and is essentially equivalent to connect a variable resistor in series.

②, shunt regulator, input end circuit is a current source which can set current (change the current of the current-limiting resistance), the current is set according to the load maximum current and is bigger than the load maximum current, that is, there is a certain current margin, the current which can not be used by the load is consumed by the parallel regulating tube, the character is the fatal shortcoming of shunt regulator, the load ability is bad, the efficiency is low, the heat is high.

③, switching regulator power supply, it is through changing direct current into high frequency pulse, then carry on the electromagnetic transformation to realize voltage transformation and steady voltage, the advantage of the switching regulator power supply is very high in efficiency, very low to generate heat, and can raise the pressure and can step down.

Common to the above three techniques: before voltage stabilization, the three DC stabilized power supplies rectify AC into DC, then add filter capacitor to carry out primary filtering, and after voltage stabilization, add filter capacitor and decoupling capacitor with certain capacity. When three kinds of direct current regulated power supply provide electric current for the load, certain voltage ripple all can appear, only the size difference is and is wanting, and this is mainly that the charge-discharge of electric capacity and the change of load current arouse. For a signal amplifier, when a traditional direct current stabilized power supply is used for supplying power, various disordered ripple interferences with different frequencies and waveforms can be found through software simulation or oscilloscope observation, resonance can also occur at certain signal frequency points, and the ripple interference can be serious.

Disclosure of Invention

In order to overcome the above problems in the prior art, the present invention provides a dynamic synchronous servo dc power supply. When the dynamic synchronous servo direct-current power supply supplies power to the audio signal amplifier, the waveform and the frequency of the ripple wave of the output voltage are completely synchronous with the waveform and the frequency of the output signal of the audio signal source, and the amplitude of the ripple voltage dynamically changes along with the strength of the output signal of the audio signal source, so that the dynamic synchronous servo direct-current power supply has very high working efficiency and extremely low dynamic internal resistance, and the technical problem of various disordered ripple wave interferences with different frequencies and waveforms when the traditional stabilized voltage power supply supplies power to the audio signal amplifier is thoroughly solved.

In order to achieve the technical purpose, the technical scheme of the invention is as follows:

dynamic synchronous servo direct current power supply, its characterized in that includes:

the voltage reduction rectification filter circuit is used for being connected with a mains supply;

a series voltage stabilizing circuit for DC voltage stabilization;

an inverting proportional amplifying circuit for inverting and amplifying the audio signal;

the signal coupling circuit is used for connecting the inverse proportion amplifying circuit and the series voltage stabilizing circuit;

the audio signal amplifier is used for connecting an audio signal source and connecting the output end of the series voltage stabilizing circuit;

an audio signal source for providing an audio signal;

the series voltage stabilizing circuit is respectively connected with the voltage reduction rectification filter circuit, the signal coupling circuit and the audio signal amplifier, and the inverse proportion amplifying circuit is respectively connected with the signal coupling circuit and the audio signal source; the audio signal source is connected with the audio signal amplifier;

the voltage reduction rectification filter circuit processes the input mains supply voltage into positive and negative double direct current voltages which are input to the series voltage stabilizing circuit, the inverse proportion amplifying circuit performs inverse amplification on an audio signal input from an audio signal source and then inputs the audio signal to the signal coupling circuit, the signal coupling circuit respectively inputs the audio signal after inverse amplification to a positive output voltage sampling and amplifying input end of the series voltage stabilizing circuit and a negative output voltage sampling and amplifying input end of the series voltage stabilizing circuit, the audio signal after inverse amplification modulates the output voltage of the series voltage stabilizing circuit, the series voltage stabilizing circuit supplies the modulated output voltage to the audio signal amplifier, and the waveform and the frequency of ripples of the modulated output voltage are completely synchronous with the waveform and the frequency of the output signal of the audio signal source.

The step-down rectification filter circuit comprises a transformer T1, a rectifier bridge Z1, a capacitor C1 and a capacitor C2, wherein the primary side of the transformer T1 is connected with a mains supply, the secondary side of the transformer T1 is connected with the alternating current input end of the rectifier bridge Z1, the central point of the secondary side of the transformer T1 is grounded, the positive output end of the rectifier bridge Z1 is connected with the positive electrode of a capacitor C1, the negative electrode of the capacitor C1 is grounded, the negative output end of the rectifier bridge Z1 is connected with the negative electrode of the capacitor C2, and the positive electrode of the capacitor C2 is grounded.

The series voltage stabilizing circuit comprises a positive voltage circuit and a negative voltage circuit,

the positive voltage circuit comprises a voltage stabilizing diode ZD1, a voltage stabilizing diode ZD2, a voltage stabilizing diode ZD3, a field effect transistor Q1, a triode Q2, a triode Q3, a resistor R1, a resistor R2, a resistor R3, a capacitor C3, a constant current diode CRD1, a potentiometer RP1 and a positive output end + Vout.

The anode of a constant current diode CRD1 is connected with the anode of a capacitor C1 of the buck rectification filter circuit, the cathode of the constant current diode CRD1 is respectively connected with the anode of a zener diode ZD1, the G of a field effect tube Q1 and the C of a triode Q3, the D of the field effect tube Q1 is connected with the anode of a capacitor C1 of the buck rectification filter circuit, the S of the field effect tube Q1 is connected with the positive output end + Vout, the cathode of the zener diode ZD1 is connected with the cathode of a zener diode ZD2, the anode of a zener diode ZD2 is connected with the positive output end + Vout, one end of a resistor R1 is respectively connected with the C of the triode Q2 and the anode of a capacitor C1 of the buck rectification filter circuit, the other end of the resistor R42 is respectively connected with the anode of a capacitor C3, the cathode of a zener diode ZD3 and the B of the triode Q2, the cathode of the capacitor C3 is grounded, the anode of the zener diode ZD3 is grounded, the other end of the resistor R3 is connected with the E pole of the triode Q2 and the E pole of the triode Q3 respectively, one end of the resistor R2 is connected with the positive output end + Vout, the other end of the resistor R2 is connected with the B pole of the triode Q3, one end of the potentiometer RP1 and one end of the potentiometer RP3 of the signal coupling circuit respectively, and the other end of the potentiometer RP1 is grounded.

The negative voltage circuit comprises a voltage stabilizing diode ZD4, a voltage stabilizing diode ZD5, a voltage stabilizing diode ZD6, a field effect transistor Q6, a triode Q4, a triode Q5, a resistor R4, a resistor R5, a resistor R6, a capacitor C4, a constant current diode CRD2, a potentiometer RP2 and a negative output end-Vout.

The cathode of a constant current diode CRD2 is connected with the cathode of a capacitor C2 of the buck rectification filter circuit, the anode of the constant current diode CRD2 is respectively connected with the anode of a zener diode ZD5, the G pole of a field effect tube Q6 and the C pole of a triode Q5, the D pole of the field effect tube Q6 is connected with the cathode of a capacitor C2 of the buck rectification filter circuit, the S pole of the field effect tube Q6 is connected with the negative output end Vout, the cathode of the zener diode ZD5 is connected with the cathode of a zener diode ZD6, the anode of the zener diode ZD6 is connected with the negative output end Vout, one end of a resistor R5 is respectively connected with the C pole of a triode Q4 and the cathode of a capacitor C2 of the buck rectification filter circuit, the other end of the resistor R5 is respectively connected with the cathode of a capacitor C4, the anode of a zener diode 4 and the B pole of a triode Q4, the anode of a capacitor C465 is grounded, the cathode of the zener diode ZD 58, the other end of the resistor R4 is connected with the E pole of the triode Q4 and the E pole of the triode Q5 respectively, one end of the resistor R6 is connected with the negative output end-Vout, the other end of the resistor R6 is connected with the B pole of the triode Q5, one end of the potentiometer RP2 and one end of the potentiometer RP4 of the signal coupling circuit respectively, and the other end of the potentiometer RP2 is grounded.

The inverting proportional amplifying circuit comprises a capacitor C7, a resistor R7, a resistor R8 and an operational amplifier U1; one end of the resistor R8 is connected to the audio input terminal Vin, the other end of the resistor R8 is connected to the inverting input terminal of the operational amplifier U1, one end of the resistor R7 and one end of the capacitor C7, respectively, the non-inverting input terminal of the operational amplifier U1 is grounded, and the output terminal of the operational amplifier U1 is connected to the other end of the resistor R7, the other end of the capacitor C7, one end of the capacitor C5 of the signal coupling circuit and one end of the capacitor C6 of the signal coupling circuit, respectively.

The signal coupling circuit comprises a potentiometer RP3, a potentiometer RP4, a capacitor C5 and a capacitor C6; the other end of the capacitor C5 is connected to the other end of the potentiometer RP3, and the other end of the capacitor C6 is connected to the other end of the potentiometer RP 4.

The audio signal amplifier is respectively connected with the positive output end + Vout of the series voltage stabilizing circuit and the negative output end-Vout of the series voltage stabilizing circuit.

The audio signal source is connected with an audio signal input end Vin of the inverting proportional amplifying circuit.

When the audio signal source has no signal output, the calculation formula of the output voltage of the series voltage stabilizing circuit is as follows:

output voltage of positive output terminal + Vout:

negative output terminal-output voltage of Vout:

in the formula R₂Is the resistance of resistor R2, R_P1Resistance value, V, of the circuit into which potentiometer RP1 is connected_ZD3The reference voltage provided for zener diode ZD 3. R₆Is the resistance of resistor R6, R_P2Resistance value, V, of the circuit into which potentiometer RP2 is connected_ZD4The reference voltage provided for zener diode ZD 4.

When the audio signal source has signal output, the calculation formula of the output voltage of the series voltage stabilizing circuit is as follows:

output voltage of positive output terminal + Vout:

negative output terminal-output voltage of Vout:

in the formula R₇Is the resistance of resistor R7, R₈Is the resistance value of the resistor R8, Vin (t), is the signal voltage of the input signal Vin provided by the audio signal source, R_P3For the resistance, R, of the circuit into which the potentiometer RP3 is connected_P4The resistance value of the circuit connected to the potentiometer RP 4. Note: vin (t) is a time domain variable, the signal voltages at different times are different, the corresponding output voltages + vout (t) and-vout (t) are functions of the variable vin (t), and the output voltages at different times are different.

Note: in the above output voltage calculation formula, the reference voltage V_ZD3Is positive, reference voltage V_ZD4Is negative. And the influence of the base currents of the transistor Q3 and the transistor Q5 on the output voltage is approximately calculated, because the base currents of the transistor Q3 and the transistor Q5 are very small, the influence on the output voltage is very small, and the influence can be ignored.

Compared with the prior art, the invention has the advantages that:

1. when the dynamic synchronous servo direct-current power supply supplies power to the audio signal amplifier, the waveform and the frequency of the ripple wave of the output voltage are completely synchronous with the waveform and the frequency of the output signal of the audio signal source, and the amplitude of the ripple voltage dynamically changes along with the strength of the output signal of the audio signal source, so that the technical problem of various disordered ripple wave interferences with different frequencies and waveforms when the traditional stabilized voltage supply supplies power to the audio signal amplifier is thoroughly solved.

2. The dynamic synchronous servo direct-current power supply comprises: the device comprises a voltage reduction rectification filter circuit, a series voltage stabilizing circuit, an inverse proportion amplifying circuit, a signal coupling circuit, an audio signal amplifier and an audio signal source, wherein the voltage reduction rectification filter circuit is connected with a mains supply, the series voltage stabilizing circuit is used for stabilizing direct current voltage, the inverse proportion amplifying circuit is used for amplifying audio signals in an inverse way, the signal coupling circuit is used for connecting the inverse proportion amplifying circuit and the series voltage stabilizing circuit, the audio signal amplifier is used for connecting the audio signal source and connecting the output end of; the series voltage stabilizing circuit is respectively connected with the voltage reduction rectification filter circuit, the signal coupling circuit and the audio signal amplifier, and the inverse proportion amplifying circuit is respectively connected with the signal coupling circuit and the audio signal source; the audio signal source is connected with the audio signal amplifier; the structure of the invention is that the modulation function of the signal to the output voltage is added on the basis of the traditional series voltage-stabilized power supply, all the filtering and decoupling capacitors at the output end of the voltage-stabilized power supply are removed, and essentially, a certain proportion of signal voltage is superposed on the basis of voltage stabilization, which does not simply stabilize the voltage any more, but is a servo mechanism, and corresponding voltage and current are synchronously and actively provided according to the requirement of the load instead of passive adjustment, so that the working efficiency of the dynamic synchronous servo direct-current power supply is very high, and the dynamic internal resistance is extremely low.

3. Compared with the traditional stabilized voltage power supply for supplying power to the audio signal amplifier, the dynamic synchronous servo direct-current power supply disclosed by the invention has the advantages that the frequency response, the amplitude-frequency characteristic, the phase-frequency characteristic, the waveform distortion and other parameters of the audio signal amplifier are obviously improved.

Drawings

FIG. 1 is a block diagram of the present invention;

FIG. 2 is a schematic diagram of the circuit of the present invention;

FIG. 3 is a graph of a 20Hz sine wave simulation waveform of the present invention;

FIG. 4 is a graph of a 20kHz sine wave simulation waveform of the present invention;

FIG. 5 is a graph of a 20Hz square wave simulation waveform of the present invention;

FIG. 6 is a waveform diagram of a 20kHz square wave simulation of the present invention.

Detailed Description

The invention is further described with reference to the accompanying drawings in which:

as shown in fig. 1: dynamic synchronous servo DC power supply includes:

a voltage-reducing rectification filter circuit 1 for connecting with the commercial power;

a series voltage stabilizing circuit 2 for dc voltage stabilization;

an inverting proportional amplifying circuit 5 for inverting-amplifying the audio signal;

a signal coupling circuit 6 for connecting the inverse proportion amplifying circuit and the series voltage stabilizing circuit;

the audio signal amplifier 3 is used for connecting an audio signal source and connecting the output end of the series voltage stabilizing circuit;

an audio signal source 4 for providing an audio signal;

the series voltage stabilizing circuit 1 is respectively connected with the voltage reduction rectification filter circuit 2, the signal coupling circuit 6 and the audio signal amplifier 3, and the inverse proportion amplifying circuit 5 is respectively connected with the signal coupling circuit 6 and the audio signal source 4; the audio signal source 4 is connected with the audio signal amplifier 3.

As shown in fig. 2, the step-down rectification filter circuit 1 includes a transformer T1, a rectifier bridge Z1, a capacitor C1 and a capacitor C2, a primary side of the transformer T1 is connected to a commercial power, a secondary side of the transformer T1 is connected to an ac input terminal of the rectifier bridge Z1, a center point of a secondary side of the transformer T1 is grounded, a positive output terminal of the rectifier bridge Z1 is connected to a positive electrode of the capacitor C1, a negative electrode of the capacitor C1 is grounded, a negative output terminal of the rectifier bridge Z1 is connected to a negative electrode of the capacitor C2, and a positive electrode of the capacitor C2 is grounded.

The voltage-reducing rectification filter circuit 1 processes the input mains supply voltage into positive and negative double direct-current voltages and inputs the positive and negative double direct-current voltages to the series voltage stabilizing circuit 2, the inverse proportion amplifying circuit 5 performs inverse amplification on an audio signal input from the audio signal source 4 and inputs the audio signal to the signal coupling circuit 6, the signal coupling circuit 6 respectively inputs the audio signal after inverse amplification to a positive output voltage sampling and amplifying input end of the series voltage stabilizing circuit 2 and a negative output voltage sampling and amplifying input end of the series voltage stabilizing circuit 2, the audio signal after inverse amplification modulates the output voltage of the series voltage stabilizing circuit 2, the series voltage stabilizing circuit 2 supplies the modulated output voltage to the audio signal amplifier 3, and the waveform and the frequency of ripples of the modulated output voltage are completely synchronous with the waveform and the frequency of the output signal of the audio signal source 4; and the amplitude of the ripple voltage dynamically follows the strength of the output signal of the audio signal source.

It should be noted that the mains voltage and frequency are different in different countries and regions, for example, the mains voltage in china is 220v and the frequency is 50 hz, and the mains voltage in japan and usa is 110 v and the frequency is 60 hz. During circuit design, corresponding adjustment is performed according to different mains supply inputs.

As shown in fig. 2, the series voltage regulation circuit 2 includes a positive voltage circuit and a negative voltage circuit,

the positive voltage circuit comprises a voltage stabilizing diode ZD1, a voltage stabilizing diode ZD2, a voltage stabilizing diode ZD3, a field effect transistor Q1, a triode Q2, a triode Q3, a resistor R1, a resistor R2, a resistor R3, a capacitor C3, a constant current diode CRD1, a potentiometer RP1 and a positive output end + Vout.

The anode of a constant current diode CRD1 is connected with the anode of a capacitor C1 of the buck rectification filter circuit 1, the cathode of the constant current diode CRD1 is respectively connected with the anode of a zener diode ZD1, the G pole of a field effect tube Q1 and the C pole of a triode Q3, the D pole of the field effect tube Q1 is connected with the anode of a capacitor C1 of the buck rectification filter circuit 1, the S pole of the field effect tube Q1 is connected with the positive output end + Vout, the cathode of a zener diode ZD1 is connected with the cathode of a zener diode ZD2, the anode of a ZD2 is connected with the positive output end + Vout, one end of a resistor R1 is respectively connected with the C pole of a triode Q2 and the anode of a capacitor C1 of the buck rectification filter circuit 1, the other end of the resistor R1 is respectively connected with the anode of a capacitor C3, the cathode of a ZD3 and the B pole of a triode Q2, the cathode of a capacitor C5 is grounded, the anode of a zener diode ZD3 is grounded, one, the other end of the resistor R3 is connected with the E pole of the triode Q2 and the E pole of the triode Q3 respectively, one end of the resistor R2 is connected with the positive output end + Vout, the other end of the resistor R2 is connected with the B pole of the triode Q3, one end of the potentiometer RP1 and one end of the potentiometer RP3 of the signal coupling circuit 6 respectively, and the other end of the potentiometer RP1 is grounded.

The negative voltage circuit comprises a voltage stabilizing diode ZD4, a voltage stabilizing diode ZD5, a voltage stabilizing diode ZD6, a field effect transistor Q6, a triode Q4, a triode Q5, a resistor R4, a resistor R5, a resistor R6, a capacitor C4, a constant current diode CRD2, a potentiometer RP2 and a negative output end-Vout.

The cathode of a constant current diode CRD2 is connected with the cathode of a capacitor C2 of the buck rectification filter circuit 1, the anode of the constant current diode CRD2 is respectively connected with the anode of a zener diode ZD5, the G pole of a field effect tube Q6 and the C pole of a triode Q5, the D pole of the field effect tube Q6 is connected with the cathode of a capacitor C2 of the buck rectification filter circuit 1, the S pole of the field effect tube Q6 is connected with a negative output end Vout, the cathode of a zener diode ZD5 is connected with the cathode of a zener diode ZD6, the anode of a zener diode ZD6 is connected with the negative output end Vout, one end of a resistor R5 is respectively connected with the C pole of the triode Q4 and the cathode of a capacitor C2 of the buck rectification filter circuit 1, the other end of the resistor R5 is respectively connected with the cathode of a capacitor C4, the anode of a zener diode ZD4 and the B pole of the triode Q4, the anode of the capacitor C4 is grounded, the cathode of the zener diode ZD, the other end of the resistor R4 is connected with the E pole of the triode Q4 and the E pole of the triode Q5 respectively, one end of the resistor R6 is connected with the negative output end-Vout, the other end of the resistor R6 is connected with the B pole of the triode Q5, one end of the potentiometer RP2 and one end of the potentiometer RP4 of the signal coupling circuit 6 respectively, and the other end of the potentiometer RP2 is grounded.

The 220V mains supply is reduced in voltage through a transformer T1, then a rectifier bridge Z1 rectifies the voltage, positive and negative double direct-current voltages are obtained after filtering of a capacitor C1 and a capacitor C2, and the direct-current voltage obtained after filtering of the capacitor C1 and a capacitor C2 is the effective value of alternating current after the voltage is reduced by the transformer

And selecting the output voltage of the transformer according to actual needs. The triode Q2, the triode Q3, the triode Q4 and the triode Q5 are all high-amplification small-power triodes, and respectively carry out differential sampling servo amplification on the output voltage of the positive output end + Vout and the output voltage of the negative output end-Vout of the series voltage stabilizing circuit. The voltage stabilizing diode ZD3 and the voltage stabilizing diode ZD4 respectively provide sampling and amplifying reference voltages, the resistor R1 is the current limiting resistor of the voltage stabilizing diode ZD3, and the resistor R5 is the current limiting resistor of the voltage stabilizing diode ZD4The capacitor C3 further filters and stabilizes the voltage across the zener diode ZD3, and the capacitor C4 further filters and stabilizes the voltage across the zener diode ZD 4. Resistor R3 is the emitter resistor of transistor Q2 and transistor Q3, resistor R4 is the emitter resistor of transistor Q4 and transistor Q5, transistor Q2 and transistor Q3 are NPN type differential pair transistors, and transistor Q4 and transistor Q5 are PNP type differential pair transistors. The resistor R3 and the resistor R4 introduce negative feedback, stabilize the sum of the currents passing through the differential pair transistors, and are equivalent to a constant current device, because the sum of the currents of the two transistors is constant current, the differential amplifier has strong inhibition effect on common mode signals, differential mode signals can be amplified, and the single tube working current of the differential pair transistors is set to be 1-5 mA. The resistor R2 and the potentiometer RP1 are output voltage sampling circuits of a positive output end + Vout, and the resistor R6 and the potentiometer RP2 are output voltage sampling circuits of a negative output end-Vout. The static output voltage is high and low through a potentiometer RP1 and a potentiometer RP 2; the constant current diode CRD1 is used as the collector load of the triode Q3, the constant current diode CRD2 is used as the collector load of the triode Q5, and the current selection of the constant current diode CRD1 and the current selection of the constant current diode CRD2 are both 1-5 mA; the constant current diode has great dynamic internal resistance, and can improve the amplification factor of sampling amplification. The constant current diode is selected to simplify the circuit, and although the constant current source is easily built by using a discrete piece, the circuit is relatively complex, and a plurality of components are used. The highest voltage withstanding values of the differential pair transistors and the constant current diodes are selected according to actually required power supply voltage; the field effect transistor Q1 is an N-channel MOS transistor and is a regulating transistor for the output voltage of the positive output end + Vout, and the field effect transistor Q6 is a P-channel MOS transistor and is a regulating transistor for the output voltage of the negative output end-Vout. The adjusting tube is a field effect tube because the field effect tube is a voltage control device, the grid input impedance is very high, the driving current is very small, the field effect tube Q1 and the field effect tube Q6 select different types and parameters according to the output voltage and current required actually, if the required current is very large, a high-power field effect tube is selected, and a plurality of field effect tubes can be used in parallel. If the adjusting tube adopts a high-power bipolar transistor, when the output current is large, the driving current is also large, the requirement can be met only by multi-stage combined amplification, and the circuit is complexThe ripple waveform of the output voltage is distorted greatly during dynamic state, so that the output voltage is difficult to make and easy to self-excite, and the processing is troublesome. The term "static" as used herein refers to a state in which no signal is output from an audio signal source, and "dynamic" refers to a state in which a signal is output from an audio signal source. The input and output voltage difference of the adjusting tube is determined according to the sum of the minimum working voltage of the constant current diode and the driving voltage required by the adjusting tube at the maximum output current: too small, the regulating tube cannot work normally; too big, the consumption of adjusting tube increases, and the work efficiency of power reduces. Zener diode ZD1, zener diode ZD 2; the Zener diode ZD5 and the Zener diode ZD6 respectively protect the field effect transistor Q1 and the field effect transistor Q6, if the field effect transistor is internally integrated with protection, the four Zener diodes can be cancelled, the selection of the Zener diode is selected according to the highest GS (grid-source electrode) breakdown voltage of the field effect transistor, for example, the highest GS breakdown voltage is +/-20V, and the protection Zener diode is selected to be tens of volts.

As shown in fig. 2, the inverting proportional amplifying circuit 5 includes a capacitor C7, a resistor R7, a resistor R8, and an operational amplifier U1; one end of the resistor R8 is connected to the audio input terminal Vin, the other end of the resistor R8 is connected to the inverting input terminal of the operational amplifier U1, one end of the resistor R7 and one end of the capacitor C7, respectively, the non-inverting input terminal of the operational amplifier U1 is grounded, and the output terminal of the operational amplifier U1 is connected to the other end of the resistor R7, the other end of the capacitor C7, one end of the capacitor C5 of the signal coupling circuit 6 and one end of the capacitor C6 of the signal coupling circuit 6, respectively.

The power supply required by the operational amplifier is omitted, and the power supply voltage of the operational amplifier is determined according to the design requirement and the parameters of the selected model of the operational amplifier. The operational amplifier is preferably of a FET field effect input type, which has high input impedance, and for the inverse proportion amplifying circuit, a balance resistor of a positive input end of the operational amplifier to the ground can be omitted and the operational amplifier is directly grounded, so that the circuit is simplified. The amplification factor of the inverse proportion amplifying circuit is determined by the ratio of the resistor R7/R8, the capacitor C7 is an anti-self-excitation capacitor, the capacity is generally several to tens of pF, and the amplification factor is determined according to the parameters of the selected operational amplifier model and the frequency of an input signal.

As shown in fig. 2, the signal coupling circuit 6 includes a potentiometer RP3, a potentiometer RP4, a capacitor C5, and a capacitor C6; the other end of the capacitor C5 is connected to the other end of the potentiometer RP3, and the other end of the capacitor C6 is connected to the other end of the potentiometer RP 4.

The capacitor C5 and the capacitor C6 are film capacitors with the capacitance of several uF to several uF, the film capacitance can be stable, the parameters are excellent, and the distortion of signal coupling is small. The potentiometers RP3 and RP4 are used for adjusting the magnitude of the modulation signal current input to the base electrodes of the triode Q3 and the triode Q5, and the base electrodes of the triode Q3 and the triode Q5 are the input ends of the sampling and amplifying of the output voltage of the series voltage stabilizing circuit 2 and are also the input ends of the modulation signals. When the input signal Vin is a positive half cycle, the signal output by the inverting proportional amplifying circuit is inverted, and then the inverted signal is input to the base of the triode Q3 through the capacitor C5 and the potentiometer RP3, the base potential of the Q3 is forcibly pulled down, the base current of the triode Q3 is reduced, the collector current of the triode Q3 is reduced, the constant current diode CRD1 is forced to release higher voltage to drive the field effect transistor Q1, at this time, the output voltage of the positive output end + Vout is increased, the current supplied to the load is increased, and the voltage difference between the input end and the output end of the field effect transistor Q1 is reduced. Meanwhile, the base electrode of the triode Q5 is forcibly pulled down by inputting the capacitor C6 and the potentiometer RP4 to the base electrode of the triode Q5, the base electrode current of the triode Q5 is increased, the collector electrode current of the triode Q5 is increased, the constant current diode CRD2 is forced to absorb redundant voltage and then drive the field effect transistor Q6, at the moment, the output voltage of a negative output end Vout is reduced, the current supplied to a load is reduced, and the voltage difference between the input end and the output end of the field effect transistor Q6 is increased. When the input signal Vin is negative half cycle, the situation is just opposite, the output voltage of the positive output end + Vout is reduced, the current supplied to the load is reduced, and the voltage difference between the input end and the output end of the field effect transistor Q1 is increased. The output voltage of the negative output end-Vout rises, the current supplied to the load increases, and the voltage difference between the input end and the output end of the field effect transistor Q6 decreases, so that the dynamic internal resistance of the power supply is basically negative according to the definition and calculation of the dynamic internal resistance (the ratio of the variation dv of the voltage between the two ends of the conductor or the semiconductor to the variation di of the current passing through the conductor or the semiconductor, namely z is dv/di) under the condition of signal modulation. When no signal is input, the output voltage of the series voltage stabilizing circuit is stabilized on the preset static output voltage value.

As shown in fig. 2, the audio signal amplifier is connected to the positive output terminal + Vout of the series regulator circuit and the negative output terminal-Vout of the series regulator circuit, respectively. The audio signal source is connected with an audio signal input end Vin of the inverting proportional amplifying circuit.

When the dynamic synchronous servo direct-current power supply supplies power to the audio signal amplifier, the waveform and the frequency of the ripple wave of the output voltage are completely synchronous with the waveform and the frequency of the output signal of the audio signal source, and the amplitude of the ripple voltage dynamically changes along with the strength of the output signal of the audio signal source, so the dynamic synchronous servo direct-current power supply is dynamic on the basis of synchronization. And the proportion of the peak value of the ripple voltage relative to the static output voltage of the power supply can be controlled by changing the amplification factor of the inverting proportion amplifying circuit and adjusting the potentiometer RP3 and the potentiometer RP4, and experiments show that the proportion adjustment is good in the range of 1/20-1/40 of the static output voltage and is the proportion of the maximum input signal. If necessary, the voltage can be out of this range, but it should be noted that at the maximum output voltage, enough input-output voltage difference must be left to ensure the normal operation of the regulating tube. For example, the power supply is used for supplying power to an audio signal amplifier, a set of power supplies are independently used for a left channel and a right channel, the static output voltage of the power supply is adjusted to +/-40V, the proportion is adjusted to 1/20, an input signal Vin of an inverting proportional amplifying circuit is a signal which is separated after an output signal of an audio signal source passes through volume control, when the volume is maximized, the peak value Vp of ripple voltage is 2V, the peak value Vp-p of the ripple voltage is 4V, the output voltage of the power supply changes from +/-38V to 42V, and when the volume is adjusted, the proportion is reduced accordingly.

When the audio signal source has no signal output, the calculation formula of the output voltage of the series voltage stabilizing circuit is as follows:

output voltage of positive output terminal + Vout:

negative output terminal-output voltage of Vout:

in the formula R₂Is the resistance of resistor R2, R_P1Resistance value, V, of the circuit into which potentiometer RP1 is connected_ZD3The reference voltage provided for zener diode ZD 3. R₆Is the resistance of resistor R6, R_P2Resistance value, V, of the circuit into which potentiometer RP2 is connected_ZD4The reference voltage provided for zener diode ZD 4.

When the audio signal source has signal output, the calculation formula of the output voltage of the series voltage stabilizing circuit is as follows:

output voltage of positive output terminal + Vout:

negative output terminal-output voltage of Vout:

in the formula R₇Is the resistance of resistor R7, R₈Is the resistance value of the resistor R8, Vin (t), is the signal voltage of the input signal Vin provided by the audio signal source, R_P3For the resistance, R, of the circuit into which the potentiometer RP3 is connected_P4The resistance value of the circuit connected to the potentiometer RP 4. Note: vin (t) is a time domain variable, the signal voltages at different times are different, the corresponding output voltages + vout (t) and-vout (t) are functions of the variable vin (t), and the output voltages at different times are different.

Note: in the above output voltage calculation formula, the reference voltage V_ZD3Is positive, reference voltage V_ZD4Is negative. And the influence of the base currents of the transistor Q3 and the transistor Q5 on the output voltage is approximately calculated, because the base currents of the transistor Q3 and the transistor Q5 are very small, the influence on the output voltage is very small, and the influence can be ignored.

The present invention is not limited to the above embodiments, and other embodiments obtained according to the technical solutions of the present invention should fall within the protection scope of the present invention.