CN107979341B - Sine wave signal generating device based on inversion technology - Google Patents
Sine wave signal generating device based on inversion technology Download PDFInfo
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- CN107979341B CN107979341B CN201711102329.9A CN201711102329A CN107979341B CN 107979341 B CN107979341 B CN 107979341B CN 201711102329 A CN201711102329 A CN 201711102329A CN 107979341 B CN107979341 B CN 107979341B
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Abstract
The invention discloses a sine wave signal generating device based on an inverter technology, which comprises a single chip microcomputer, a DDS chip, a digital potentiometer chip, a comparison control circuit and an H-bridge circuit, wherein the H-bridge circuit comprises an MOS (metal oxide semiconductor) tube Q1, an MOS tube Q2, an MOS tube Q3, an MOS tube Q4 and a low-pass filter; the DDS chip and the digital potentiometer chip are matched to generate an expected sine wave signal under the control of the single chip microcomputer, the comparison control circuit generates four control signals according to an error between the expected signal and a current feedback value of the H-bridge circuit, the four control signals respectively control four MOS (metal oxide semiconductor) tubes of the H-bridge circuit to realize SPWM (sinusoidal pulse width modulation) control, and then the sine wave signal applied to an excitation object is generated through the low-pass filter. The invention can generate pulse control signals through inner loop feedback to realize the generation of expected sine waves similar to SPWM control, and can adjust the amplitude of sine wave output through outer loop signal feedback to achieve the purpose of closed loop control.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a sine wave signal generation technology.
Background
The current commonly used sine wave signal source is generally realized by adopting direct digital frequency synthesis, namely DDS technology, the DDS technology is the latest frequency source synthesizing method at present based on Shannon sampling theorem, and the basic principle is that the theoretical sampling value of the required signal is realized by D/A conversion and a low-pass filter. The DDS chip register is arranged through buses such as a singlechip I2C and the like, so that sine wave signals with various frequencies can be realized conveniently.
Fig. 1 illustrates the principle of the DDS technique, where N is the phase accumulator word length, K is the frequency control word, fc is the clock frequency, and fo is the output frequency. By setting K and N, one can obtain: phase increment delta psi of 2 pi/2 in unit clock periodNThe output sine wave frequency fo is Kfc/2NResolution is Δ f ═ fc/2N。
According to the area equivalent principle of the sampling control theory, namely the effect of adding the narrow pulses with equal impulse but different shapes to the link with inertia is basically the same, and the sine wave signal generation can also be realized through the SPWM inversion technology.
As shown in fig. 2: the SPWM signal may be generated by comparing a triangular wave with a sinusoidal wave, outputting a negative voltage when the triangular wave amplitude is higher than the desired sinusoidal wave amplitude, and outputting a positive voltage when the triangular wave amplitude is lower than the desired sinusoidal wave amplitude. If the triangular wave frequency is sufficiently large, the SPWM pulse has a waveform substantially equal to the desired sine wave after passing through a suitable filter.
At present, both the direct digital frequency synthesis and SPWM technology have special chips which are easy to realize digital control, the frequency conversion speed is high, the precision is high, the complexity of a control circuit can be greatly reduced, and particularly, the DDS technology can conveniently realize sine wave signals with various frequencies.
However, these two methods also have some disadvantages, mainly including: the power of the output signal of the special integrated chip is too small to meet the application requirement of a circuit with larger power, and the amplitude of the output signal cannot be continuously adjusted; although the output power requirement can be met without using a dedicated chip to implement the sine wave signal, the circuit complexity is inevitably increased greatly, a specific algorithm needs to be added, and finally, the signal amplitude and frequency variation flexibility cannot be achieved.
Therefore, it is necessary to design a sine wave signal source that can not only exert the advantages of digital frequency synthesis, but also satisfy the requirements of flexible output power and amplitude frequency variation.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a sine wave signal generating device which not only can exert the advantages of digital frequency synthesis, but also can meet the requirements of flexible output power and amplitude frequency change.
In order to solve the technical problems, the invention adopts the following technical scheme: a sine wave signal generating device based on an inversion technology comprises a single chip microcomputer, a DDS chip, a digital potentiometer chip, a comparison control circuit and an H bridge circuit, wherein the H bridge circuit comprises an MOS tube Q1, an MOS tube Q2, an MOS tube Q3, an MOS tube Q4 and a low-pass filter, the MOS tube Q1 and an MOS tube Q2 are connected with a first MOS tube driving chip, and the MOS tube Q3 and an MOS tube Q4 are connected with a second MOS tube driving chip; the DDS chip and the digital potentiometer chip are matched to generate an expected sine wave signal under the control of the single chip microcomputer, the comparison control circuit generates four control signals according to an error between the expected signal and a current feedback value of the H-bridge circuit, the four control signals respectively control four MOS (metal oxide semiconductor) tubes of the H-bridge circuit to realize SPWM (sinusoidal pulse width modulation) control, then a low-pass filter generates a sine wave signal applied to an excitation object, the excitation object is connected with an output circuit of the H-bridge circuit, and a voltage feedback value of the excitation object is used as a control parameter of the digital potentiometer to adjust the output of an expected amplitude value.
Preferably, the comparison control circuit comprises a first amplifier, and a second amplifier and a third amplifier connected with the first amplifier, wherein the input ends of the first amplifier, the second amplifier and the third amplifier are connected with a reference level, the deviation of an expected sine wave and a current feedback signal is obtained through the first amplifier, and the deviation signals are respectively compared through the second amplifier and the third amplifier to obtain two paths of square wave signals similar to the SPWM.
Preferably, the comparison control circuit further comprises a JK flip-flop and a phase inverter connected to the MOS transistor driver chip, each SPWM generates mutually exclusive square wave control signals through the phase inverter and the JK flip-flop, the MOS transistors are controlled through the MOS transistor driver chip, the MOS transistors Q2 and Q3 are turned off when the MOS transistors Q1 and Q4 are turned on, and the MOS transistors Q1 and Q4 are turned off when the MOS transistors Q2 and Q3 are turned on.
Preferably, the first amplifier is connected with a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C5 and a capacitor C6, wherein the resistor R2, the resistor R3, the resistor R4 and the first amplifier form an adder for generating a deviation signal, and the resistor R5, the capacitor C5 and the capacitor C6 are configured to perform a filtering function.
Preferably, the low-pass filter includes an inductor L1, an inductor L2, an inductor L3, an inductor L4, a capacitor C1, a capacitor C2, a capacitor C3, and a capacitor C4.
Preferably, the comparison control circuit further comprises a transformer T1 and a resistor R1, the first partial coil of the transformer T1 is connected to the H-bridge circuit, and the transformer T1 and the resistor R1 convert the operating current into a voltage value for feedback.
Preferably, the excitation target is connected to a transformer T2 and a transformer T3, and a sine wave signal formed by the SPWM is output to the excitation target through the transformer T2 and then fed back through the transformer T3.
The technical scheme adopted by the invention is mainly to apply a DDS chip, a digital potentiometer chip, an H-bridge circuit and a feedback control principle to generate sine wave signals. The problem of low output power of chip signals is solved by applying an H-bridge circuit, sine wave signals with various expected frequencies and amplitudes can be conveniently generated by applying a DDS and a digital potentiometer chip, pulse control signals can be generated by inner ring feedback to realize that the control is similar to SPWM control to generate expected sine waves, and the amplitude of sine wave output can be adjusted by outer ring signal feedback to achieve the purpose of closed-loop control.
After the technical scheme is adopted, the invention has the following advantages:
1. the frequency and the amplitude of the output sine wave can be controlled in a digital way through a singlechip, a DDS chip,
The control of the digital potentiometer chip is realized;
2. the output power of the signal is large, and the DC power supply power, the filter circuit and the device parameters can be adjusted
Number to change the maximum output power;
3. the application range is wide, and various applications can be realized according to different excitation objects or loads.
Drawings
The invention is further described with reference to the accompanying drawings and the detailed description below:
FIG. 1 is a schematic diagram of the basic principle of DDS technology;
FIG. 2 is a schematic diagram of SPWM signal generation;
FIG. 3 is a functional block diagram of the present invention;
fig. 4 is a functional block diagram of a comparison control circuit.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
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. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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.
As shown in fig. 3 and 4, a sine wave signal generating device based on an inverter technology includes a single chip, a DDS chip, a digital potentiometer chip, a comparison control circuit, and an H-bridge circuit, where the H-bridge circuit includes a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q3, a MOS transistor Q4, and a low-pass filter, the MOS transistor Q1 and the MOS transistor Q2 are connected to a first MOS transistor driving chip, and the MOS transistor Q3 and the MOS transistor Q4 are connected to a second MOS transistor driving chip;
the DDS chip and the digital potentiometer chip are matched to generate an expected sine wave signal under the control of the single chip microcomputer, the comparison control circuit generates four control signals according to an error between the expected signal and a current feedback value of the H-bridge circuit, the four control signals respectively control four MOS (metal oxide semiconductor) tubes of the H-bridge circuit to realize SPWM (sinusoidal pulse width modulation) control, then a low-pass filter generates a sine wave signal applied to an excitation object, the excitation object is connected with an output circuit of the H-bridge circuit, and a voltage feedback value of the excitation object is used as a control parameter of the digital potentiometer to adjust the output of an expected amplitude value.
Specifically, the comparison control circuit comprises a first amplifier, and a second amplifier and a third amplifier which are connected with the first amplifier, wherein the input ends of the first amplifier, the second amplifier and the third amplifier are connected with a reference level circuit, the output ends of the second amplifier and the third amplifier are connected with a JK trigger and a phase inverter, and the JK trigger is connected with the MOS tube driving chip. The reference level circuit mainly ensures dead time when two SPWM circuits are driven, prevents upper and lower MOS (metal oxide semiconductor) tubes of the same bridge arm from being short-circuited, obtains deviation of an expected sine wave and a current feedback signal through a first amplifier (an H bridge is conducted, if the conduction time is too long, the generated current is larger than the expected current, the deviation is negative, the H bridge is closed, if the conduction time is too short, the generated current is smaller than the expected current, the deviation is positive), and obtains two square wave signals similar to the SPWM through comparison of a second amplifier and a third amplifier respectively by the deviation signals (the output deviation signals are compared with the middle level of the second amplifier and the third amplifier, and if the deviation is larger than the middle level, the MOS tubes output to enable the H bridge to be conducted.
Each SPWM generates mutually exclusive square wave control signals through a phase inverter and a JK trigger, the MOS tube is controlled through a MOS tube driving chip, the MOS tube Q2 and the MOS tube Q3 are closed when the MOS tube Q1 and the MOS tube Q4 are switched on, and the MOS tube Q1 and the MOS tube Q4 are closed when the MOS tube Q2 and the MOS tube Q3 are switched on.
Furthermore, the first amplifier is connected with a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C5 and a capacitor C6, wherein the resistor R2, the resistor R3, the resistor R4 and the first amplifier form an adder for generating a deviation signal, and the resistor R5, the capacitor C5 and the capacitor C6 play a role in filtering. The low-pass filter comprises an inductor L1, an inductor L2, an inductor L3, an inductor L4, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4. The low-pass filter enables the sine wave to work on the main frequency, and plays a role in low-pass filtering, so that inversion from the SPWM signal to the sine wave is realized.
In addition, the comparison control circuit further comprises a transformer T1 and a resistor R1, the first part coil of the transformer T1 is connected into an H-bridge circuit, and the transformer T1 and the resistor R1 convert the working current into a voltage value for feedback. Since the turn-off and turn-on frequency of the MOS transistor is higher than that of the sine wave, the voltage change caused by the turn-on and turn-off of the MOS transistor is quickly reflected to the transformer T1, so that when the turn-on time of the MOS transistor is too long, the voltage is higher than the expected value, a signal for turning off the MOS transistor is formed, and when the voltage is lower than the expected value, the signal for turning on the MOS transistor is formed, and the inner loop feedback control is formed.
The excitation object is connected to a transformer T2 and a transformer T3, and a sine wave signal formed by the SPWM is output to the excitation object through the transformer T2 and then fed back through the transformer T3. If the feedback voltage value does not meet the expected requirement, the single chip microcomputer can adjust by changing the amplitude of the expected sine wave so as to achieve the purpose of closed-loop control, if the feedback voltage is large, the array potentiometer is controlled so that the amplitude of the sine wave expected to be output is reduced, and because of the relation of deviation control, the final output is close to the expected value, and the output voltage is reduced.
Other embodiments of the present invention than the preferred embodiments described above, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, should fall within the scope of the present invention defined in the claims.
Claims (2)
1. A sine wave signal generating device based on an inverter technology is characterized by comprising a single chip microcomputer, a DDS chip, a digital potentiometer chip, a comparison control circuit and an H-bridge circuit, wherein the H-bridge circuit comprises an MOS tube Q1, an MOS tube Q2, an MOS tube Q3, an MOS tube Q4 and a low-pass filter, the MOS tube Q1 and an MOS tube Q2 are connected with a first MOS tube driving chip, and the MOS tube Q3 and an MOS tube Q4 are connected with a second MOS tube driving chip; the DDS chip and the digital potentiometer chip are matched to generate an expected sine wave signal under the control of the single chip microcomputer, the comparison control circuit generates four control signals according to an error between the expected signal and a current feedback value of the H-bridge circuit, the four control signals respectively control four MOS (metal oxide semiconductor) tubes of the H-bridge circuit to realize SPWM (sinusoidal pulse width modulation) control, then a sine wave signal applied to an excitation object is generated through a low-pass filter, the excitation object is connected with an output circuit of the H-bridge circuit, and a voltage feedback value of the excitation object is used as a control parameter of the digital potentiometer to adjust the output of an expected amplitude value;
the comparison control circuit comprises a first amplifier, a second amplifier and a third amplifier, wherein the second amplifier and the third amplifier are connected with the first amplifier, the input ends of the first amplifier, the second amplifier and the third amplifier are connected with a reference level, the deviation of an expected sine wave and a current feedback signal is obtained through the first amplifier, and the deviation signals are respectively compared through the second amplifier and the third amplifier to obtain two paths of square wave signals similar to SPWM; the comparison control circuit further comprises a JK trigger and a phase inverter which are connected with the MOS tube driving chip, each SPWM generates mutually exclusive square wave control signals through the phase inverter and the JK trigger, the MOS tube driving chip controls the MOS tube, the MOS tube Q2 and the MOS tube Q3 are closed when the MOS tube Q1 and the MOS tube Q4 are switched on, and the MOS tube Q1 and the MOS tube Q4 are closed when the MOS tube Q2 and the MOS tube Q3 are switched on; the first amplifier is connected with a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C5 and a capacitor C6, wherein the resistor R2, the resistor R3, the resistor R4 and the first amplifier form an adder for generating a deviation signal, and the formula of the resistor R5, the capacitor C5 and the capacitor C6 plays a role in filtering; the low-pass filter comprises an inductor L1, an inductor L2, an inductor L3, an inductor L4, a capacitor C1, a capacitor C2, a capacitor C3 and a capacitor C4; the comparison control circuit further comprises a transformer T1 and a resistor R1, a first partial coil of the transformer T1 is connected into an H-bridge circuit, and the transformer T1 and the resistor R1 convert the working current into a voltage value for feedback.
2. The sine wave signal generating device based on the inversion technology as claimed in claim 1, wherein: the excitation object is connected to a transformer T2 and a transformer T3, and a sine wave signal formed by the SPWM is output to the excitation object through the transformer T2 and then fed back through the transformer T3.
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| CN110932613B (en) * | 2019-12-20 | 2023-06-23 | 维沃移动通信有限公司 | Motor driving circuit and electronic device |
| CN115639408A (en) * | 2022-12-23 | 2023-01-24 | 中大智能科技股份有限公司 | High-precision soil conductivity self-adaptive monitoring system |
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