阅读说明：本技术 交流电流源 (Alternating current source ) 是由 卢维 于 2019-08-29 设计创作，主要内容包括：本发明公开一种交流电流源,包括信号处理电路、功率放大调节电路、输出电路及采样反馈电路,信号处理电路的输入端输入交流电源,信号处理电路的输出端与功率放大调节电路的输入端连接,功率放大调节电路的输出端与输出电路的输入端连接,采样反馈电路的采样端与输出电路的输出端连接,采样反馈电路的反馈端与信号处理电路的输入端连接；信号处理电路将输入的交流电源通过傅里叶变换分解为N路正弦控制信号；功率放大调节电路包括N路功率放大电路,每一功率放大电路输入一路正弦控制信号；采样反馈电路采样输出电路的输出电流信号反馈至信号处理电路。本发明技术方案提升了交流电流源输出电流的精度。(The invention discloses an alternating current source which comprises a signal processing circuit, a power amplification regulating circuit, an output circuit and a sampling feedback circuit, wherein an alternating current power supply is input into the input end of the signal processing circuit, the output end of the signal processing circuit is connected with the input end of the power amplification regulating circuit, the output end of the power amplification regulating circuit is connected with the input end of the output circuit, the sampling end of the sampling feedback circuit is connected with the output end of the output circuit, and the feedback end of the sampling feedback circuit is connected with the input end of the signal processing circuit; the signal processing circuit decomposes an input alternating current power supply into N paths of sinusoidal control signals through Fourier transform; the power amplification regulating circuit comprises N power amplification circuits, and each power amplification circuit inputs a sinusoidal control signal; the sampling feedback circuit samples the output current signal of the output circuit and feeds the output current signal back to the signal processing circuit. The technical scheme of the invention improves the precision of the output current of the alternating current source.)

1. An alternating current source is characterized by comprising a signal processing circuit, a power amplification regulating circuit, an output circuit and a sampling feedback circuit, wherein the input end of the signal processing circuit is used for inputting an alternating current power supply, the output end of the signal processing circuit is connected with the input end of the power amplification regulating circuit, the output end of the power amplification regulating circuit is connected with the input end of the output circuit, the sampling end of the sampling feedback circuit is connected with the output end of the output circuit, and the feedback end of the sampling feedback circuit is connected with the input end of the signal processing circuit;

the signal processing circuit is used for decomposing an input alternating current power supply into N paths of sinusoidal control signals through Fourier transform and sending the N paths of sinusoidal control signals to the power amplification regulating circuit;

the power amplification regulating circuit comprises N power amplification circuits, and each power amplification circuit inputs one sinusoidal control signal decomposed by the signal processing circuit; each power amplifying circuit is used for generating a standard analog sinusoidal signal according to an input sinusoidal control signal and performing power amplification processing so as to output each path of output signals after power amplification to the output circuit for vector synthesis;

the sampling feedback circuit is used for sampling the output current signals after the vector synthesis of the output circuit, feeding the sampled output current signals back to the signal processing circuit, comparing the sampled output current signals with the N paths of sinusoidal control signals one by one after Fourier transform, and adjusting and outputting the sinusoidal control signals corresponding to each power amplification circuit in the power amplification adjusting circuit.

2. The ac current source of claim 1, wherein said signal processing circuit splits N sinusoidal control signals of the ac power source into one fundamental and N-1 harmonics by fourier transform.

3. The ac current source of claim 2, wherein one of said N power amplifier circuits is a digital power amplifier circuit, and the remaining N-1 power amplifier circuits are linear amplifier circuits;

the digital power amplifying circuit is used for performing power amplification processing on the fundamental wave decomposed by the signal processing circuit;

each linear amplifying circuit is used for amplifying the harmonic waves decomposed by the signal processing circuit.

4. The ac current source according to claim 3, wherein each of the power amplifier circuits comprises a signal control circuit and a current amplifier circuit, an input terminal of the signal control circuit is an input terminal of the power amplifier circuit, an output terminal of the signal control circuit is connected to an input terminal of the current amplifier circuit, and an output terminal of the current amplifier circuit is an output terminal of the power amplifier circuit;

the signal control circuit is used for converting the sine control signal correspondingly input by the signal processing circuit into a standard sine wave signal and outputting the standard sine wave signal to the current amplifying circuit;

and the current amplifying circuit is used for carrying out current amplification processing on the input standard sine wave signal and outputting the processed signal.

5. The ac current source of claim 4, wherein each of said power amplifying circuits further comprises a sampling circuit, an input terminal of said sampling circuit is connected to an output terminal of said current amplifying circuit, and an output terminal of said sampling circuit is connected to an input terminal of said signal control circuit;

the sampling circuit is used for collecting current signals output by the current amplifying circuit and feeding the current signals back to the signal control circuit so as to adjust the output current of the signal control circuit.

6. The ac current source according to claim 1, wherein said signal processing circuit decomposes the input ac power into N sinusoidal control signals by fourier transform, and outputs the control signals to N of said power amplifying circuits in said power amplifying and adjusting circuit in one-to-one correspondence.

7. The ac current source of claim 1, wherein the output current signal of said output circuit is a vector sum of vector-synthesized output signals respectively output to said output circuit by each of said power amplifying circuits.

Technical Field

The invention relates to the technical field of alternating current source detection, in particular to an alternating current source.

Background

With the development of science and technology, the high-speed development of power electronic technology, many advanced electronic technologies are continuously emerging, the field related to electronic equipment becomes wider and wider, the types of electric equipment are more and more, and meanwhile, the requirements on the control performance of the electric equipment and the power supply precision are also improved. The constant voltage source and the constant current source are important in instruments and meters, electronic equipment and high and new technology industries, however, more researches on the constant voltage source have been devoted for a long time, and in comparison, the researches and designs on the constant current source, particularly an alternating current source, are relatively limited. Along with the development of high efficiency, high stability, high power density and modularization of the power supply, the power supply has more and more important significance for the research and development of the power supply.

The current sources have respective defects in indexes such as harmonic waves, stability, accuracy and the like, and generally adopt a single power source output mode which cannot be compatible under various environments. With the development of various metering devices in China, the index requirements on the current source are higher and higher, and particularly in the field of special application, the domestic technology is far from meeting the requirements.

Disclosure of Invention

The invention mainly aims to provide an alternating current source, aiming at improving the accuracy of the output current of the alternating current source.

In order to achieve the above object, the ac current source provided by the present invention includes a signal processing circuit, a power amplification regulating circuit, an output circuit, and a sampling feedback circuit, wherein an input end of the signal processing circuit is used for inputting an ac power source, an output end of the signal processing circuit is connected to an input end of the power amplification regulating circuit, an output end of the power amplification regulating circuit is connected to an input end of the output circuit, a sampling end of the sampling feedback circuit is connected to an output end of the output circuit, and a feedback end of the sampling feedback circuit is connected to an input end of the signal processing circuit;

the signal processing circuit is used for decomposing an input alternating current power supply into N paths of sinusoidal control signals through Fourier transform and sending the N paths of sinusoidal control signals to the power amplification regulating circuit;

the power amplification regulating circuit comprises N power amplification circuits, and each power amplification circuit correspondingly inputs one sinusoidal control signal decomposed by the signal processing circuit one by one; each power amplifying circuit is used for generating a standard analog sinusoidal signal according to an input sinusoidal control signal and performing power amplification processing so as to output each output signal after power amplification to an output circuit for vector synthesis;

the sampling feedback circuit is used for sampling the output current signals after vector synthesis of the output circuit, feeding the sampled output current signals back to the signal processing circuit, comparing the sampled output current signals with the N paths of sinusoidal signals one by one after Fourier transform, and adjusting and outputting the sinusoidal control signals corresponding to each power amplification circuit in the power amplification adjusting circuit.

Optionally, the signal processing circuit divides N sinusoidal control signals of the ac power supply decomposed by fourier transform into one fundamental wave and N-1 harmonics.

Optionally, one of the N power amplification circuits is a digital power amplification circuit, and the other N-1 power amplification circuits are linear amplification circuits;

the digital power amplifying circuit is used for performing power amplification processing on the fundamental wave decomposed by the signal processing circuit;

each linear amplifying circuit is used for amplifying the harmonic waves decomposed by the signal processing circuit.

Optionally, each of the power amplification circuits includes a signal control circuit and a current amplification circuit, an input end of the signal control circuit is an input end of the power amplification circuit, an output end of the signal control circuit is connected to an input end of the current amplification circuit, and an output end of the current amplification circuit is an output end of the power amplification circuit;

the signal control circuit is used for converting the sine control signal correspondingly input by the signal processing circuit into a standard sine wave signal and outputting the standard sine wave signal to the current amplifying circuit;

and the current amplifying circuit is used for carrying out current amplification processing on the input standard sine wave signal and outputting the processed signal.

Optionally, each of the power amplifying circuits further includes a sampling circuit, an input end of the sampling circuit is connected to an output end of the current amplifying circuit, and an output end of the sampling circuit is connected to an input end of the signal control circuit;

the sampling circuit is used for collecting current signals output by the current amplifying circuit and feeding the current signals back to the signal control circuit so as to adjust the output current of the signal control circuit.

Optionally, the signal processing circuit decomposes the input ac power into N sinusoidal control signals through fourier transform, and outputs the N sinusoidal control signals to the N power amplification circuits in the power amplification and adjustment circuit in a one-to-one correspondence.

Optionally, the output current signal of the output circuit is a vector sum of vector combinations of output signals respectively output to the output circuit by each power amplifying circuit.

According to the technical scheme, the alternating current source comprises a signal processing circuit, a power amplification regulating circuit, an output circuit and a sampling feedback circuit, wherein the output end of the signal processing circuit is connected with the input end of the power amplification regulating circuit, the output end of the power amplification regulating circuit is connected with the input end of the output circuit, the sampling end of the sampling feedback circuit is connected with the output end of the output circuit, and the feedback end of the sampling feedback circuit is connected with the input end of the signal processing circuit; the signal processing circuit decomposes an input alternating current power supply into N paths of sine control signals, the N paths of sine control signals are correspondingly output to N paths of power amplifying circuits in the power amplifying and adjusting circuit one by one, namely, each sine control signal is correspondingly issued to one path of power amplifying circuit for power amplifying processing, and then each amplified current signal is output to the output circuit for vector synthesis. A sampling feedback circuit is arranged between the output circuit and the signal processing circuit, and can collect output current signals after vector synthesis of the output circuit, then the output current signals are fed back to the signal processing circuit to be subjected to Fourier transform decomposition, and then the current signals collected by the output circuit are compared and analyzed with the N sinusoidal control signals one by one to adjust the sinusoidal control signals output to each power amplification circuit in the power amplification adjusting circuit, namely the sinusoidal control signals are compared with each sinusoidal control signal in the N sinusoidal control signals decomposed by the signal processing circuit, and the amplitude and the frequency of the sinusoidal control signals output to each power amplification circuit are adjusted. The technical scheme of the invention improves the precision of the output current of the alternating current power supply.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic circuit diagram of an AC current source according to an embodiment of the present invention;

FIG. 2 is a schematic circuit diagram illustrating an embodiment of a power amplification and regulation circuit of the AC current source in FIG. 1 according to the present invention;

FIG. 3 is a waveform diagram of an embodiment of a sinusoidal control signal decomposed by an AC current source according to the present invention;

FIG. 4 is a schematic circuit diagram illustrating an embodiment of the power amplifier circuit shown in FIG. 2 according to the present invention;

FIG. 5 is a waveform diagram illustrating fundamental and harmonic waveforms of an embodiment of the AC current source output circuit of the present invention;

FIG. 6 is a schematic diagram of a vector sum of an AC current source output circuit according to an embodiment of the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Signal processing circuit	210	Power amplifying circuit
200	Power amplification regulating circuit	211	Signal control circuit
				300	Output circuit	212	Current amplifying circuit
400	Sampling feedback circuit	213	Sampling circuit

The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides an alternating current source.

In an embodiment of the present invention, as shown in fig. 1 and fig. 2, the ac current source includes a signal processing circuit 100, a power amplification regulating circuit 200, an output circuit 300, and a sampling feedback circuit 400, an input end of the signal processing circuit 100 is used for inputting an ac power, an output end of the signal processing circuit 100 is connected to an input end of the power amplification regulating circuit 200, an output end of the power amplification regulating circuit 200 is connected to an input end of the output circuit 300, a sampling end of the sampling feedback circuit 400 is connected to an output end of the output circuit 300, and a feedback end of the sampling feedback circuit 400 is connected to an input end of the signal processing circuit 100;

the signal processing circuit 100 is configured to decompose an input ac power supply into N sinusoidal control signals through fourier transform, and send the N sinusoidal control signals to the power amplification and adjustment circuit 200;

the power amplification regulating circuit 200 includes N power amplification circuits 210, and each power amplification circuit 210 inputs a sinusoidal signal decomposed by the signal processing circuit 100; each of the power amplifying circuits 210 is configured to generate a standard analog sinusoidal signal according to an input sinusoidal control signal, perform power amplification processing, and output each of the output signals after power amplification to the output circuit 300 for vector synthesis;

the sampling feedback circuit 400 is configured to sample an output current signal obtained by vector synthesis by the output circuit 300, and feed back the sampled output current signal to the signal processing circuit 100, and compare the signal with N sinusoidal control signals one by one after fourier transform, so as to adjust and output the sinusoidal control signal corresponding to each power amplification circuit 210 in the power amplification adjustment circuit 200.

In this embodiment, the signal processing circuit 100 decomposes the input ac power into N sinusoidal control signals, and it is understood that the signal processing circuit 100 may be a high-speed digital signal processing system or a high-speed DSP processing system, and may decompose the complex ac power into multiple sinusoidal control signals through fourier transform. That is, the input ac power is decomposed into sine waves of various frequencies by fourier transform, and then each of the decomposed sine control signals is output to each of the power amplification circuits 210 in the power amplification and adjustment circuit 200, so as to amplify the multiple sine control signals output by the signal processing circuit 100.

The fourier transform, i.e. the fast fourier transform, in the above embodiments means that a certain function satisfying a certain condition can be represented as a trigonometric function (sine and/or cosine function) or a linear combination of their integrals. In different fields of research, fast fourier transforms have many different variant forms, such as continuous fourier transforms and discrete fourier transforms. It is a method of analyzing a signal, and components of the signal may be analyzed, or the signal may be synthesized using these components. Many waveforms can be used as components of the signal, such as sine waves, square waves, sawtooth waves, etc., and fast fourier transforms use sine waves as components of the signal.

The power amplification regulating circuit 200 includes N power amplifying circuits 210, and it can be understood that the N power amplifying circuits 210 correspond to N sinusoidal control signals decomposed by the signal processing circuit 100 one to one. After the ac power is decomposed into N sinusoidal control signals by fourier transform in the signal processing circuit 100, each sinusoidal control signal corresponds to one power amplification circuit 210, so as to realize independent amplification of each sinusoidal control signal. After each path of sinusoidal control signal is amplified, it is output to the output circuit 300. The N-channel power amplifier circuit 210 may be 5 channels, 10 channels, 15 channels, etc., and is set according to the actual situation of the application environment, and is not limited here.

In this embodiment, the power amplifying circuit 210 may be a transformer coupled to the power amplifying circuit 210, and the power amplifying circuit 210 may implement impedance transformation, but has a large volume, low efficiency, and poor low-frequency and high-frequency characteristics; or a class A linear amplifying circuit is adopted, the output of the amplifier is in direct proportion to the input signal, and a straight line passing through the origin is formed on the coordinate. That is, in the present scheme, the sinusoidal control signal output by the signal processing circuit 100 is in direct proportion to the current signal output by the power amplification and adjustment circuit 200, the waveform states are consistent, and only the amplitudes are different; a class D digital power amplifying circuit can be adopted, which is similar to a DC-DC switch type inverter circuit, for the scheme, each sinusoidal control signal output by the signal processing circuit 100 is modulated and processed by a PWM circuit to form a pulse chain with a duty ratio in a certain proportion to the sinusoidal control signal, and after the pulse chain is amplified by the switch circuit, a low-pass filter filters high-frequency components to restore the waveform of the amplified sinusoidal control signal.

In the above embodiment, the sampling feedback circuit 400 collects the output current signal of the output circuit 300 and feeds the output current signal back to the signal processing circuit 100. It can be understood that the output current signal collected here is a vector sum of vector compositions of each power amplifying circuit 210 in the power amplifying and adjusting circuit 200 after performing power amplification, and outputting the amplified current to the output circuit, that is, each power amplifying circuit 210 has an amplified current output, and a vector sum calculated for the outputs of the N power amplifying circuits 210 is the output current of the output circuit 300. After receiving the feedback signal output by the sampling feedback circuit 400, the signal processing circuit 100 performs fast fourier analysis on the feedback sampling signal, that is, compares the feedback sampling signal with each sinusoidal control signal after fourier transform in the signal processing circuit 100, so as to adjust each sinusoidal control signal in N paths of sinusoidal control signals decomposed by fourier transform in the signal processing circuit 100. The scheme improves the precision of the output current of the output circuit 300.

It should be noted that, the input ac power source mentioned in the above scheme may be a complex ac signal to be amplified; the signal processing circuit 100 performs fourier transform decomposition on the fed-back sampling signal, and then compares the processed sampling signal with the N sinusoidal control signals one by one to adjust each sinusoidal control signal output by the signal processing circuit 100, that is, adjust the amplitude and frequency of each sinusoidal control signal.

According to the technical scheme, an alternating current source comprises a signal processing circuit 100, a power amplification regulating circuit 200, an output circuit 300 and a sampling feedback circuit 400, wherein the output end of the signal processing circuit 100 is connected with the input end of the power amplification regulating circuit 200, the output end of the power amplification regulating circuit 200 is connected with the input end of the output circuit 300, the sampling end of the sampling feedback circuit 400 is connected with the output end of the output circuit 300, and the feedback end of the sampling feedback circuit 400 is connected with the input end of the signal processing circuit 100; the signal processing circuit 100 decomposes the input ac power into N sinusoidal control signals, and the N sinusoidal control signals are output to the N power amplification circuits 210 in the power amplification and adjustment circuit 200 in a one-to-one correspondence manner, that is, each sinusoidal control signal is correspondingly issued to each power amplification circuit 210 for power amplification, and then each amplified current signal is output to the output circuit 300 for vector synthesis. The sampling feedback circuit 400 is provided between the output circuit 300 and the signal processing circuit 100, and is capable of collecting an output current signal after vector synthesis of the output circuit 300, feeding the output current signal back to the signal processing circuit 100 for fourier transform decomposition, collecting a current signal of the output circuit 300 and N sinusoidal control signals, and performing one-to-one comparison analysis to adjust a sinusoidal control signal corresponding to each power amplification circuit 210 output to the power amplification adjusting circuit 200, that is, comparing the current signal with each sinusoidal control signal in the N sinusoidal control signals decomposed by the signal processing circuit 100, and adjusting the amplitude and frequency of the sinusoidal control signal output to each power amplification circuit 210. The technical scheme of the invention improves the precision of the output current of the alternating current power supply.

Based on the above embodiment, the signal processing circuit 100 divides N sinusoidal control signals of the ac power supply decomposed by fourier transform into one fundamental wave and N-1 harmonics.

In this embodiment, one of the N power amplification circuits 210 is a digital power amplification circuit, and the other N-1 power amplification circuits are linear amplification circuits;

the digital power amplifying circuit is configured to perform power amplification processing on the fundamental wave decomposed by the signal processing circuit 100;

each of the linear amplifying circuits is configured to amplify the harmonic wave decomposed by the signal processing circuit 100.

It can be understood that, in the above scheme, one fundamental wave and N-1 harmonics are used to decompose the ac power input to the signal processing circuit 100 by fourier transform. Furthermore, the fundamental wave decomposed by Fourier transform in the scheme is 50HZ, and the N-1 path of harmonic waves are a plurality of harmonic wave signal groups with different frequencies. As shown in fig. 3, the 50HZ fundamental wave waveform, the 2 nd harmonic wave waveform, the 3 rd harmonic wave waveform, and the 4 th harmonic wave waveform are decomposed by fourier transform in the signal processing circuit 100. Thereby, the fundamental wave and a plurality of harmonics with different frequencies are output to the power amplification regulating circuit 200 to be amplified independently.

It should be noted that the fundamental wave decomposed by the signal processing circuit 100 is correspondingly input to the digital power amplifying circuit, and the N-1 harmonic waves are correspondingly input to the N-1 linear amplifying circuit one by one. Therefore, the sinusoidal control signal output by the signal processing circuit 100 is independently amplified, and the accuracy of the output current of the power amplification regulating circuit 200 is improved while the energy efficiency is improved.

In this embodiment, when the signal processing circuit 100 inputs an ac power, the fourier transform may decompose a signal of one cycle into a dc component C₀And linear superposition of sinusoidal control signals of different frequencies:C_nrepresenting the amplitude of the n harmonic, nw₀Is the angular frequency.

When n is 1, C₀+C₁COSw₀t is the fundamental component with an angular frequency w₀，The frequency of the fundamental component is, that is, the fundamental frequency in this embodiment is 50HZ, and the frequency of the n-th harmonic is an integer multiple of the fundamental frequency. It is understood that the frequency of the fundamental component is equal to the frequency of the alternating current power supply here.

In the above-described embodiment, the fundamental wave is a sine wave component equal to the longest period of the oscillation in a complex periodic oscillation, and the frequency corresponding to this period is referred to as the fundamental frequency. Harmonic refers to a portion of a periodic function or a periodic waveform that can be expressed by a linear combination of a constant, the same sine function as the minimum positive period of the original function, and a cosine function.

In an embodiment, as shown in fig. 4, each of the power amplifying circuits 210 includes a signal control circuit 211 and a current amplifying circuit 212, an input terminal of the signal control circuit 211 is an input terminal of the power amplifying circuit 210, an output terminal of the signal control circuit 211 is connected to an input terminal of the current amplifying circuit 212, and an output terminal of the current amplifying circuit 212 is an output terminal of the power amplifying circuit 210;

the signal control circuit 211 is configured to convert the sinusoidal control signal correspondingly input by the signal processing circuit 100 into a standard sinusoidal signal, and output the standard sinusoidal signal to the current amplifying circuit 212;

the current amplifying circuit 212 is configured to perform current amplification processing on the input standard sine wave signal and output the processed signal.

In this embodiment, each of the power amplifying circuits 210 further includes a sampling circuit 213, an input end of the sampling circuit 213 is connected to an output end of the current amplifying circuit 212, and an output end of the sampling circuit 213 is connected to an input end of the signal control circuit 211;

the sampling circuit 213 is configured to collect a current signal output by the current amplifying circuit 212 and feed the current signal back to the signal control circuit 211, so as to adjust the output current of the signal control circuit 211.

In this embodiment, N sinusoidal control signals decomposed by the signal processing circuit 100 through fourier transform are input to the N power amplifying circuits 210 in a one-to-one correspondence manner, the sinusoidal control signals input correspondingly are converted into standard sinusoidal signals by the signal control circuit 211 in each power amplifying circuit 210, and the standard sinusoidal signals output by the signal control circuit 211 are output to the current amplifying circuit 212, and the standard sinusoidal signals output by the signal control circuit 211 are amplified, so that the power independent amplification of each sinusoidal control signal output by the signal processing circuit 100 is realized. After each sinusoidal control signal output from the signal processing circuit 100 is converted into a standard sinusoidal signal and amplified, the amplified signal output from the current amplification circuit 212 is sampled by the sampling circuit 213, and the sampled amplified signal is output to the input terminal of the signal control circuit 211, and the signal control circuit 211 compares and analyzes the amplified signal output from the current amplification circuit 212, thereby adjusting the standard sinusoidal signal output from the signal control circuit 211. According to the scheme, each power amplification circuit 210 inputs independent amplification of the sinusoidal control signal, and each power amplification circuit 210 outputs independent sampling of the current signal, so that independent adjustment of each sinusoidal control signal decomposed by the signal processing circuit 100 is realized, and the precision of each power amplification circuit 210 outputting the current signal is improved.

In an embodiment, the output current signal of the output circuit 300 is a vector sum of vector combinations of the output signals respectively output to the output circuit 300 by each of the power amplifying circuits 210.

In this embodiment, the output signals of each power amplifier circuit 210 in the N power amplifier circuits 210 are synthesized in the output circuit 300, and the output waveform after vector superposition is the final output current signal. The scheme takes sine waves as an example: sine wave current function I ═ I_m sin(ω_t+φ)＝I_msin (2 pi f t + phi), where I is the current (a) at time t, Im is the maximum current (a), ω is the angular frequency (rad/s), and Φ is the initial phase shift value, assuming that the output waveform fundamental wave is required to be 50Hz, the amplitude is I, the amplitude content of the included fourth harmonic is 40%, and the phase shift is 30 °, the ac input by the signal processing circuit 100 is obtainedThe source is decomposed into fundamental and fourth harmonics by fourier transform. The first path of output fundamental wave has a wave form function of I ═ I_msin (100 pi x t), the second output is the fourth harmonic, the current waveform frequency is 200Hz, the amplitude content is 40%, the relative phase is 30 degrees, namely the waveform function isThe first and second output waveforms are as shown in fig. 5. N paths of sinusoidal control signals decomposed by fourier transform in the signal processing circuit 100 are amplified by N paths of power amplifying circuits 210 in the power amplifying and adjusting circuit 200, and then high-fidelity currents are output, and vector superposition is performed in the output circuit 300, so that an output waveform obtained through experiments is shown in fig. 6. The scheme improves the precision of the output current of the alternating current source.

It can be understood that the more the sinusoidal control signal waveform decomposed by fourier transform, i.e., the more the sinusoidal control signal amplified by the power amplification circuit 210, the higher the accuracy of the output current of the ac current source.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.