CN113009197A - Amplitude-frequency adjustable power source - Google Patents
Amplitude-frequency adjustable power source Download PDFInfo
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- CN113009197A CN113009197A CN202110180010.8A CN202110180010A CN113009197A CN 113009197 A CN113009197 A CN 113009197A CN 202110180010 A CN202110180010 A CN 202110180010A CN 113009197 A CN113009197 A CN 113009197A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses an amplitude-frequency adjustable power source which comprises a frequency modulation input module, an amplitude modulation input module and a multiplier, wherein the frequency modulation input module can output an alternating current signal and modulate the frequency of the alternating current signal, the amplitude modulation input module can output a direct current signal and modulate the amplitude of the direct current signal, the multiplier is provided with a first input end and a second input end, the first input end of the multiplier is electrically connected with the output end of the frequency modulation input module, and the second input end of the multiplier is electrically connected with the output end of the amplitude modulation input module so as to superpose and output the alternating current signal and the direct current signal. The invention can simultaneously modulate frequency and amplitude, has high frequency modulation precision and low output waveform distortion rate.
Description
Technical Field
The invention relates to the field of power sources, in particular to an amplitude-frequency adjustable power source.
Background
At present, the existing sinusoidal power source is generally realized by adopting a PWM modulation method or a resonance method, but the limit frequency of the sinusoidal waveform output by the PWM modulation method is low, while the sinusoidal waveform output by the resonance method is difficult to be simultaneously frequency-modulated and amplitude-modulated, and the sinusoidal waveform modulated by the two methods has a high distortion rate and a large harmonic component. For some application fields requiring high requirements on sinusoidal power sources, such as medical instruments, the conventional sinusoidal power sources are difficult to meet the requirements of users.
Disclosure of Invention
The present invention is directed to solving one of the problems of the prior art. Therefore, the invention provides the amplitude-frequency adjustable power source which can simultaneously carry out frequency modulation and amplitude modulation, and has the advantages of high frequency modulation precision and low output waveform distortion rate.
The amplitude-frequency adjustable power source comprises a frequency modulation input module, an amplitude modulation input module and a multiplier, wherein the frequency modulation input module can output an alternating current signal and modulate the frequency of the alternating current signal, the amplitude modulation input module can output a direct current signal and modulate the amplitude of the direct current signal, the multiplier is provided with a first input end and a second input end, the first input end of the multiplier is electrically connected with the output end of the frequency modulation input module, and the second input end of the multiplier is electrically connected with the output end of the amplitude modulation input module so as to superpose and output the alternating current signal and the direct current signal.
The power source with adjustable amplitude and frequency has the following beneficial effects:
the invention relates to an amplitude-frequency-adjustable power source, wherein a frequency modulation input module can output an alternating current signal with adjustable frequency, an amplitude modulation input module can output a direct current signal with adjustable amplitude, the alternating current signal with adjustable frequency and the direct current signal with adjustable amplitude are both input into a multiplier, a signal with adjustable amplitude and frequency is finally obtained through superposition operational amplification of the multiplier, the frequency of the signal can be modulated by modulating the frequency of the alternating current signal, and the amplitude of the signal can be modulated by modulating the amplitude of the direct current signal. Therefore, the amplitude-frequency adjustable power source can simultaneously carry out frequency modulation and amplitude modulation, the frequency modulation precision is high, and the output waveform distortion rate is low.
According to some embodiments of the present invention, the apparatus further comprises a control module, wherein the control module is electrically connected to the fm input module and the am input module, respectively.
According to some embodiments of the invention, the frequency modulated input module is a DDS sinusoidal signal generator.
According to some embodiments of the present invention, the apparatus further comprises a power amplifier module, wherein an input end of the power amplifier module is electrically connected to an output end of the multiplier.
According to some embodiments of the present invention, the apparatus further comprises a feedback module, and the feedback module is electrically connected to the output terminal of the power amplifier module, the output terminal of the amplitude modulation input module, and the second input terminal of the multiplier, respectively, to calibrate the dc signal.
According to some embodiments of the present invention, the feedback module includes a voltage division sampling circuit, a peak hold circuit, and a comparator, the comparator has a first input terminal and a second input terminal, the input terminal of the voltage division sampling circuit is electrically connected to the output terminal of the power amplifier module, the input terminal of the peak hold circuit is electrically connected to the output terminal of the voltage division sampling circuit, the first input terminal of the comparator is electrically connected to the output terminal of the amplitude modulation input module, the second input terminal of the comparator is electrically connected to the output terminal of the peak hold circuit, and the output terminal of the comparator is electrically connected to the second input terminal of the multiplier.
According to some embodiments of the present invention, the voltage division sampling circuit includes a resistor R1 and a resistor R2, one end of the resistor R1 is electrically connected to the output terminal of the power amplifier module, the other end of the resistor R1 is electrically connected to the peak holding circuit and one end of the resistor R2, respectively, and the other end of the resistor R2 is electrically connected to ground.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of a schematic structure of one embodiment of a power source of the present invention;
fig. 2 is a schematic circuit diagram of a power source according to an embodiment of the invention.
Reference numerals:
the frequency modulation input module 100, the amplitude modulation input module 200, the multiplier 300, the control module 400, the power amplifier module 500, the feedback module 600, the voltage division sampling circuit 610, the peak holding circuit 620 and the comparator 630.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the positional or orientational descriptions referred to, for example, the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., are based on the positional or orientational relationships shown in the drawings and are for convenience of description and simplicity of description only, and do not indicate or imply that the sandbags or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
An amplitude-frequency adjustable power source according to the present invention, as shown in fig. 1, includes a frequency modulation input module 100, an amplitude modulation input module 200, and a multiplier 300, where the amplitude modulation input module 200 is capable of outputting an ac signal and modulating a frequency of the ac signal, the amplitude modulation input module 200 is capable of outputting a dc signal and modulating an amplitude of the dc signal, the multiplier 300 is provided with a first input end and a second input end, the first input end of the multiplier 300 is electrically connected to an output end of the frequency modulation input module 100, and the second input end of the multiplier 300 is electrically connected to an output end of the amplitude modulation input module 200 to superimpose and output the ac signal and the dc signal.
Therefore, the amplitude-frequency adjustable power source can simultaneously carry out frequency modulation and amplitude modulation, the frequency modulation precision is high, and the output waveform distortion rate is low. The fm input module 100 can output an ac signal with adjustable frequency, the am input module 200 can output a dc signal with adjustable amplitude, both the ac signal with adjustable frequency and the dc signal with adjustable amplitude are input to the multiplier 300, and a signal with adjustable amplitude and frequency is finally obtained through the superposition operational amplifier of the multiplier 300, wherein the frequency of the signal can be modulated by modulating the frequency of the ac signal, and the amplitude of the signal can be modulated by modulating the amplitude of the dc signal.
Specifically, assuming that the first input signal of the multiplier 300 is V1, the second input signal of the multiplier 300 is V2, and the output signal of the multiplier 300 is V3, V1, V2, and V3 satisfy V3 ═ K × V1 × V2, where K is a constant coefficient, and the value of K is determined by the multiplier 300 itself. Generally, the type of the multiplier 300 is preferably AD734, and the type of the multiplier 300 has high precision, small error and only 2MHz bandwidth when the gain is 400.
In some embodiments of the present invention, as shown in fig. 1, the present invention further includes a control module 400, and the control module 400 is electrically connected to the fm input module 100 and the am input module 200, respectively.
Specifically, the control module 400 is generally a single chip microcomputer, and the single chip microcomputer can change the frequency of the output signal of the fm input module 100 by sending a control command, and can also change the amplitude of the output signal of the am input module 200 by sending a control command, so as to achieve the effect of simultaneously utilizing the nc fm and am. Generally, the model of the single chip microcomputer is preferably STM32F103, the internal DA precision of the single chip microcomputer of the model is 12 bits, and the adjusting resolution is about 0.81 mV.
In some embodiments of the present invention, the fm input module 100 is a DDS sine signal generator.
Specifically, the DDS sinusoidal signal generator is high in frequency resolution, multiple in output frequency points, high in frequency switching speed, low in output phase noise, small in size, light in weight and convenient to integrate. Generally, the model of the DDS sinusoidal signal generator is preferably AD9850, and the DDS sinusoidal signal generator of this model can output a sinusoidal wave with a frequency range of 0.1Hz to 40MHz, has a wide output frequency range and an accuracy of 0.029Hz, and is much higher than the accuracy of the conventional PWM modulation power source and the conventional resonant power source.
In some embodiments of the present invention, as shown in fig. 1, the present invention further includes a power amplifier module 500, and an input end of the power amplifier module 500 is electrically connected to an output end of the multiplier 300.
Specifically, the power amplifier module 500 may include a class a power amplifier circuit and may also include a class b power amplifier circuit. In an embodiment of the present invention, if the requirement for the power amplifier module 500 is low distortion rate, the power amplifier module 500 includes a class a power amplifier circuit; in another embodiment of the present invention, the power amplifier module 500 is required to have low power consumption, and the power amplifier module 500 includes a class b power amplifier circuit. In addition, the output terminal of the power amplifier module 500 can be regarded as the output terminal of the whole power source, and is electrically connected to the external load and normally operates.
In some embodiments of the present invention, as shown in fig. 1, the power amplifier further includes a feedback module 600, and the feedback module 600 is electrically connected to the output terminal of the power amplifier module 500, the output terminal of the amplitude modulation input module 200, and the second input terminal of the multiplier 300 respectively to calibrate the dc signal.
Specifically, the signal output by the power amplifier module 500 is actually the signal output by the multiplier 300 that is subjected to power amplification processing, so that the feedback module 600 actually forms a feedback signal by using the signal output by the multiplier 300, and re-transmits the feedback signal to the second input end of the multiplier 300 to form a feedback adjustment system, which plays a role of negative feedback adjustment on the multiplier 300, and the feedback signal can play a role of reference calibration on the dc signal output by the amplitude modulation input module 200, so that the amplitude modulation error of the amplitude modulation input module 200 can be reduced, and the accuracy of amplitude modulation is improved.
In some embodiments of the present invention, as shown in fig. 1 and fig. 2, the feedback module 600 includes a voltage division sampling circuit 610, a peak hold circuit 620 and a comparator 630, the comparator 630 has a first input end and a second input end, the input end of the voltage division sampling circuit 610 is electrically connected to the output end of the power amplifier module 500, the input end of the peak hold circuit 620 is electrically connected to the output end of the voltage division sampling circuit 610, the first input end of the comparator 630 is electrically connected to the output end of the amplitude modulation input module 200, the second input end of the comparator 630 is electrically connected to the output end of the peak hold circuit 620, and the output end of the comparator 630 is electrically connected to the second input end of the multiplier 300.
Specifically, the comparator 630 is a voltage comparator, and the signal output by the output terminal is obtained by calibrating and comparing the signals input by the two input terminals. The signal output by the output terminal of the power amplifier module 500 is an ac signal, the instantaneous voltage value of the ac signal is constantly changing, the voltage division sampling circuit 610 can divide the ac signal output by the output terminal of the power amplifier module 500 to obtain a feedback ac signal, and further output the feedback ac signal to the peak hold circuit 620, when the feedback ac signal is input into the peak hold circuit 620, the peak hold circuit 620 can record the peak value of the instantaneous voltage value of the feedback ac signal and output a feedback dc signal for calibrating the dc signal, the voltage value of the feedback dc signal is equal to the peak value of the instantaneous voltage value recorded by the peak hold circuit 620, the feedback dc signal output by the peak hold circuit 620 is then input to the second input terminal of the comparator 630, and the dc signal output by the amplitude modulation input module 200 is calibrated and adjusted, further, the signal input to the second input terminal of the multiplier 300 is adjusted, so that the accuracy of amplitude modulation of the power source is increased, and errors are reduced.
In some embodiments of the present invention, as shown in fig. 2, the voltage division sampling circuit 610 includes a resistor R1 and a resistor R2, one end of the resistor R1 is electrically connected to the output terminal of the power amplifier module 500, the other end of the resistor R1 is electrically connected to the peak holding circuit 620 and one end of the resistor R2, respectively, and the other end of the resistor R2 is electrically connected to ground.
Specifically, the total resistance of the voltage division sampling circuit 610 is the sum of the resistance values of the resistor R1 and the resistor R2, and assuming that the ratio between the amplitude of the signal output by the power amplifier module 500 and the amplitude of the signal input by the peak holding circuit 620 is a voltage division coefficient, the voltage division coefficient is equal to the ratio between the resistance value of the resistor R2 and the total resistance of the voltage division sampling circuit 610. The resistances of the resistor R1 and the resistor R2 may be set according to actual conditions.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. An amplitude-frequency adjustable power source, comprising:
a frequency modulated input module (100) capable of outputting an alternating current signal and capable of modulating the frequency of the alternating current signal;
an amplitude modulation input module (200) capable of outputting a direct current signal and capable of modulating an amplitude of the direct current signal;
the multiplier (300) is provided with a first input end and a second input end, the first input end of the multiplier (300) is electrically connected with the output end of the frequency modulation input module (100), and the second input end of the multiplier (300) is electrically connected with the output end of the amplitude modulation input module (200) so as to superpose and output the alternating current signal and the direct current signal.
2. An amplitude-frequency adjustable power source as claimed in claim 1, wherein: the frequency modulation input module (100) and the amplitude modulation input module (200) are electrically connected with the control module (400), and the control module (400) is electrically connected with the frequency modulation input module (100) and the amplitude modulation input module (200) respectively.
3. An amplitude-frequency adjustable power source as claimed in claim 1, wherein: the frequency modulation input module (100) is a DDS sine signal generator.
4. An amplitude-frequency adjustable power source as claimed in claim 2, wherein: the power amplifier further comprises a power amplifier module (500), and the input end of the power amplifier module (500) is electrically connected with the output end of the multiplier (300).
5. An amplitude-frequency adjustable power source as claimed in claim 4, wherein: the power amplifier further comprises a feedback module (600), and the feedback module (600) is electrically connected with the output end of the power amplifier module (500), the output end of the amplitude modulation input module (200) and the second input end of the multiplier (300) respectively to calibrate the direct current signal.
6. An amplitude-frequency adjustable power source as claimed in claim 5, wherein: the feedback module (600) comprises a voltage division sampling circuit (610), a peak value holding circuit (620) and a comparator (630), wherein the comparator (630) is provided with a first input end and a second input end, the input end of the voltage division sampling circuit (610) is electrically connected with the output end of the power amplifier module (500), the input end of the peak value holding circuit (620) is electrically connected with the output end of the voltage division sampling circuit (610), the first input end of the comparator (630) is electrically connected with the output end of the amplitude modulation input module (200), the second input end of the comparator (630) is electrically connected with the output end of the peak value holding circuit (620), and the output end of the comparator (630) is electrically connected with the second input end of the multiplier (300).
7. An amplitude-frequency adjustable power source as claimed in claim 6, wherein: the voltage division sampling circuit (610) comprises a resistor R1 and a resistor R2, one end of the resistor R1 is electrically connected with the output end of the power amplifier module (500), the other end of the resistor R1 is electrically connected with the peak holding circuit (620) and one end of the resistor R2 respectively, and the other end of the resistor R2 is electrically connected with the ground.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110180010.8A CN113009197A (en) | 2021-02-08 | 2021-02-08 | Amplitude-frequency adjustable power source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110180010.8A CN113009197A (en) | 2021-02-08 | 2021-02-08 | Amplitude-frequency adjustable power source |
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| CN113009197A true CN113009197A (en) | 2021-06-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114221527A (en) * | 2022-02-22 | 2022-03-22 | 深圳市深澳视觉科技有限公司 | Alternating current-direct current energy conversion control circuit and high-frequency medical equipment |
| CN115728530A (en) * | 2022-11-14 | 2023-03-03 | 浙江涵普电力科技有限公司 | Wide-load adaptive AC testing voltage source device |
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| CN110531127A (en) * | 2019-07-23 | 2019-12-03 | 深圳市嘉兆鸿电子有限公司 | Power source |
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| US4672300A (en) * | 1985-03-29 | 1987-06-09 | Braydon Corporation | Direct current power supply using current amplitude modulation |
| CN1344980A (en) * | 2001-10-10 | 2002-04-17 | 杭州竞达电子有限公司 | AC power source stable feedback method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115728530A (en) * | 2022-11-14 | 2023-03-03 | 浙江涵普电力科技有限公司 | Wide-load adaptive AC testing voltage source device |
| CN115728530B (en) * | 2022-11-14 | 2024-06-04 | 浙江涵普电力科技有限公司 | Wide load adaptability alternating current test voltage source device |
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Application publication date: 20210622 |