CN108762372B - Driving signal generation system and method - Google Patents
Driving signal generation system and method Download PDFInfo
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- CN108762372B CN108762372B CN201810539685.5A CN201810539685A CN108762372B CN 108762372 B CN108762372 B CN 108762372B CN 201810539685 A CN201810539685 A CN 201810539685A CN 108762372 B CN108762372 B CN 108762372B
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/02—Digital function generators
- G06F1/025—Digital function generators for functions having two-valued amplitude, e.g. Walsh functions
Abstract
The invention discloses a driving signal generating system and a driving signal generating method. Wherein the system comprises: the power amplifier comprises a control unit, a filter circuit, a bipolar signal conversion unit and a power amplification unit, wherein the control unit is used for generating a pulse width modulation signal; the input end of the filter circuit is connected with the output end of the control unit and is used for filtering the pulse width modulation signal output by the control unit; the input end of the bipolar signal conversion unit is connected with the output end of the filter circuit and is used for adjusting the pulse width modulation signal subjected to filtering processing to obtain a control signal; the input end of the power amplification unit is connected with the output end of the bipolar signal conversion unit and used for performing power amplification on the input control signal to generate a driving signal. The driving signal generating system and the method provided by the invention can simplify the circuit structure for generating the driving signal, thereby reducing the hardware cost of the circuit.
Description
Technical Field
The invention relates to the technical field of signal processing, in particular to a driving signal generating system and a driving signal generating method.
Background
Pulse Width Modulation (PWM) is a very effective technique for controlling an analog circuit by modulating the Width of a series of pulses to equivalently obtain a desired waveform, and is widely used in many fields from measurement, communication to power control and conversion.
In the prior art, pulse width modulation is realized by a technical route of a microcontroller and a digital-to-analog conversion module, a sine function or a triangular function is periodically dispersed into hundreds of points, a function value corresponding to each point is made into a table, each function value corresponds to a voltage value, a microprocessor continuously outputs the voltage value based on the size of each function value, and then the processes are circularly repeated, so that signals with various pulse shapes can be obtained at the output end of the digital-to-analog conversion module. However, the hardware circuit of the above method is complex, the digital-to-analog conversion module occupies a lot of I/O ports of the microprocessor, the pin resource consumption is serious, and in addition, when the frequency and phase adjustment of the control signal is needed, the modification of the software is also very large, which is not beneficial to the later maintenance. In the power electronic technology, the voltage value of a modulation wave and a carrier wave in a certain intersection interval is compared, the high level and the low level of an output level and the duration of the high level or the low level are controlled, and narrow pulses with different shapes are added to a link with inertia according to equal impulse, so that the waveform of a required pulse width modulation wave is obtained. However, the above method needs a carrier wave with a certain frequency and a related bridge circuit to implement, and has complex hardware and higher cost.
Therefore, it is an important issue to be solved in the art how to provide a driving signal generating system capable of generating a driving signal by using a pwm wave to reduce the hardware cost of the circuit.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a driving signal generating system and a driving signal generating method.
In one aspect, the present invention provides a driving signal generating system, which includes a control unit, a filter circuit, a bipolar signal converting unit, and a power amplifying unit, wherein:
the control unit is used for generating a pulse width modulation signal;
the input end of the filter circuit is connected with the output end of the control unit and is used for filtering the pulse width modulation signal output by the control unit;
the input end of the bipolar signal conversion unit is connected with the output end of the filter circuit and is used for adjusting the pulse width modulation signal subjected to filtering processing to obtain a control signal;
the input end of the power amplification unit is connected with the output end of the bipolar signal conversion unit and used for performing power amplification on the input control signal to generate a driving signal.
The control unit adopts a single chip microcomputer, and the model of the single chip microcomputer is STC15W4K56S 4.
The filter circuit adopts a passive second-order low-pass RC filter.
Wherein, the bipolar signal conversion unit adopts an OP07C single-channel subtracter.
The power amplification unit adopts an LM1875 power amplifier.
In another aspect, the present invention provides a driving signal generating method, including:
the control unit outputs a pulse width modulation signal to the filter circuit according to preset working parameters;
the filter circuit carries out filtering processing on the pulse width modulation signal and sends the pulse width modulation signal subjected to filtering processing to a bipolar signal conversion unit;
the bipolar signal conversion unit obtains a control signal according to a preset voltage and the pulse width modulation signal subjected to filtering processing and sends the control signal to the power amplification unit;
the power amplification unit is used for carrying out power amplification on the input control signal to generate a driving signal.
The working parameters comprise the period of a pulse width modulation signal, the number of the periods of the pulse width modulation signal included in a single period of the driving signal, and the duty ratio corresponding to each period of the pulse width modulation signal in the single period of the driving signal.
Wherein the operating parameter further comprises a clock of the pulse width modulated signal.
Wherein, the obtaining of the control signal by the bipolar signal conversion unit according to the preset voltage and the filtered pulse width modulation signal comprises:
and obtaining the control signal after amplifying a difference value obtained by subtracting the preset voltage from the voltage of the pulse width modulation signal.
The driving signal is a sine wave, a triangular wave or a sawtooth wave modulated by pulse width.
According to the driving signal generation system and method provided by the invention, the pulse width modulation signal generated by the control unit is output to the filter circuit, is subjected to filtering processing by the filter circuit and is sent to the bipolar signal conversion unit for adjustment to obtain the control signal, and the power amplification unit is used for carrying out power amplification on the control signal to generate the driving signal, so that the circuit structure for generating the driving signal can be simplified, and the hardware cost of the circuit is reduced.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a driving signal generating system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a filter circuit according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating a driving signal generating method according to an embodiment of the invention;
description of reference numerals:
1-a control unit; 2-a filter circuit;
3-a bipolar signal conversion unit; 4-power amplification unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a driving signal generating system according to an embodiment of the present invention, and as shown in fig. 1, the driving signal generating system provided by the present invention includes a control unit 1, a filter circuit 2, a bipolar signal converting unit 3, and a power amplifying unit 4, wherein:
the control unit 1 is used for generating a pulse width modulation signal; the input end of the filter circuit 2 is connected with the output end of the control unit 1 and is used for filtering the pulse width modulation signal received from the control unit 1; the input end of the bipolar signal conversion unit 3 is connected to the output end of the filter circuit 2, and can receive the filtered pulse width modulation signal from the filter circuit 2, so as to adjust the filtered pulse width modulation signal and obtain a control signal; the input end of the power amplifying unit 4 is connected to the output end of the bipolar signal converting unit 3, and is used for performing power amplification on the control signal input from the bipolar signal converting unit 3 to generate a driving signal.
The operation of the driving signal generating system according to the present invention will be described. The control unit 1 can adopt a singlechip, when generating the pulse width modulation signal, the working parameters of the singlechip need to be set in advance, the working parameters comprise the period of the pulse width modulation signal, the number of the periods of the pulse width modulation signal in a single period of the driving signal and the duty ratio corresponding to the period of each pulse width modulation signal in the single period of the driving signal, the period of the pulse width modulation signal is realized by setting a counter of the singlechip, for example, the period of the pulse width modulation signal is set to be 2400 clock periods of the single chip microcomputer, the number of periods of the pulse width modulated signal included within a single period of the drive signal is set in the on-chip register, and the duty ratio corresponding to the period of each pulse width modulation signal in a single period of the driving signal is arranged in a register of the singlechip. If the default clock of the single chip microcomputer cannot meet the requirement for generating the pulse width modulation signal, the clock of the single chip microcomputer, namely the clock of the pulse width modulation signal, needs to be set, and the working parameters comprise the clock of the pulse width modulation signal. After the working parameters are set, when the single chip microcomputer is started, the single chip microcomputer can calculate and obtain the high level duration and the low level duration of the pulse width modulation signal based on the period of the pulse width modulation signal and the duty ratio corresponding to the period of the pulse width modulation signal, the single chip microcomputer outputs high level in the high level duration, and the single chip microcomputer outputs low level in the low level duration; according to the number of the periods of the pulse width modulation signals included in a single period of the driving signal, the single chip microcomputer outputs the pulse width modulation signals with the number of the periods of the pulse width modulation signals in one period of the driving signal. When receiving the pulse width modulation signal output by the single chip microcomputer, the filter circuit 2 performs filtering processing on the pulse width modulation signal, then sends the pulse width modulation signal subjected to filtering processing to the bipolar signal conversion unit 3, the bipolar signal conversion unit 3 amplifies a difference value obtained by subtracting a preset voltage from a voltage of the pulse width modulation signal to obtain the control signal, then sends the control signal to the power amplification unit 4, and the power amplification unit 4 performs power amplification on the control signal to generate the driving signal. The preset voltage is set according to practical experience, and the embodiment of the invention is not limited.
According to the driving signal generation system provided by the invention, the pulse width modulation signal generated by the control unit is output to the filter circuit, is subjected to filtering processing by the filter circuit and is sent to the bipolar signal conversion unit for adjustment to obtain the control signal, and the power amplification unit is used for carrying out power amplification on the control signal to generate the driving signal, so that the circuit structure for generating the driving signal can be simplified, and the hardware cost of the circuit is reduced.
On the basis of the above embodiments, the control unit 1 further adopts a single chip microcomputer, and the model of the single chip microcomputer is STC15W4K56S 4.
On the basis of the above embodiments, the filter circuit 2 further employs a passive second-order low-pass RC filter.
For example, fig. 2 is a schematic structural diagram of a filter circuit according to an embodiment of the present invention, and as shown in fig. 2, the filter circuit is the passive second-order low-pass RC filter, and a series circuit composed of a resistor R2 and a capacitor C2 is further connected in parallel with a capacitor C1 to a main circuit having a resistor R1. The resistor R2 and the capacitor C2 are connected in series to form a series circuit, one end of the series circuit is connected with the resistor R1, the other end of the series circuit is grounded, one end of the capacitor C1 is connected between the resistor R1 and the series circuit, the other end of the capacitor C1 is grounded, and the resistor R2 and the capacitor C2 are connected between the resistor R2 and the output end of the capacitor C2. Wherein R1 and R2 may equal 3k Ω and C1 and C2 may equal 1 microfarad.
On the basis of the above embodiments, further, the bipolar signal conversion unit 3 employs an OP07C single-channel subtractor.
On the basis of the above embodiments, the power amplifying unit 4 further adopts an LM1875 power amplifier.
Fig. 3 is a schematic flow chart of a driving signal generating method according to an embodiment of the present invention, and as shown in fig. 3, the driving signal generating method according to the present invention includes:
s301, the control unit outputs a pulse width modulation signal to the filter circuit according to preset working parameters;
specifically, the driving signal generating method provided by the present invention may be based on the driving signal generating system described in any of the above embodiments. The control unit may generate a pulse width modulation signal based on an operating parameter and output the pulse width modulation signal to a filter circuit. The operating parameters are preset and may include a period of the pwm signal, a number of periods of the pwm signal included in a single period of the driving signal, and a duty ratio corresponding to each period of the pwm signal in the period of the driving signal.
S302, the filter circuit carries out filtering processing on the pulse width modulation signal and sends the pulse width modulation signal subjected to filtering processing to a bipolar signal conversion unit;
specifically, after receiving the pulse width modulation signal, the filter circuit performs filtering processing on the pulse width modulation signal, and then sends the pulse width modulation signal subjected to filtering processing to a bipolar signal conversion unit.
S303, the bipolar signal conversion unit obtains a control signal according to a preset voltage and the pulse width modulation signal after filtering processing and sends the control signal to a power amplification unit;
specifically, after receiving the filtered pulse width modulation signal, the bipolar signal conversion unit amplifies a difference value obtained by subtracting a preset voltage from a voltage of the pulse width modulation signal to obtain a control signal, and then sends the control signal to the power amplification unit.
And S304, the power amplification unit performs power amplification on the input control signal to generate a driving signal.
Specifically, the power amplification unit performs power amplification on the control signal after receiving the control signal, so as to generate a driving signal, and the driving signal is used for driving a load.
According to the driving signal generation method provided by the invention, the pulse width modulation signal generated by the control unit is output to the filter circuit, is subjected to filtering processing by the filter circuit and is sent to the bipolar signal conversion unit for adjustment to obtain the control signal, and the power amplification unit is used for carrying out power amplification on the control signal to generate the driving signal, so that the circuit structure for generating the driving signal can be simplified, and the hardware cost of the circuit is reduced.
On the basis of the foregoing embodiments, further, the operating parameter includes a period of a pulse width modulation signal, a number of periods of the pulse width modulation signal included in a single period of the driving signal, and a duty ratio corresponding to each period of the pulse width modulation signal in the single period of the driving signal.
Specifically, the period of the pwm signal may be set to a preset number of clock periods, where the preset number is set according to actual needs, and the embodiment of the present invention is not limited. The more the number of the periods of the pulse width modulation signal included in a single period of the driving signal is, the more accurate the driving signal is, and the number of the periods of the pulse width modulation signal is set according to actual needs, which is not limited in the embodiment of the present invention. The duty ratio corresponding to the period of each pulse width modulation signal in a single period of the driving signal is set according to actual needs, and the embodiment of the invention is not limited.
On the basis of the foregoing embodiments, further, the operating parameter further includes a clock of the pulse width modulation signal.
Specifically, when the default clock of the control unit cannot meet the generation requirement of the pulse width modulation signal, the generation requirement of the pulse width modulation signal can be met by selecting other clocks of the control unit.
On the basis of the foregoing embodiments, further, the obtaining, by the bipolar signal conversion unit, a control signal according to a preset voltage and the filtered pulse width modulation signal includes:
and obtaining the control signal after amplifying a difference value obtained by subtracting the preset voltage from the voltage of the pulse width modulation signal.
Specifically, after obtaining the filtered pulse width modulation signal, the bipolar signal conversion unit subtracts the preset voltage from the voltage of the filtered pulse width modulation signal to obtain a difference between the two voltages, and amplifies the difference to obtain the control signal.
In addition to the above embodiments, the driving signal may be a pulse width modulated sine wave, a triangular wave, or a sawtooth wave.
In particular, the drive signal may be a pulse width modulated sine wave, a triangular wave or a sawtooth wave.
For clarity of description of the driving signal generating method provided by the present invention, the following description will take the example of generating a pulse width modulated sine wave. And (3) discretely taking 200 point values from a complete sine function independent variable value interval according to an interval equal principle, wherein the sine function value corresponding to each point is the duty ratio in each PWM period, and the SPWM signals can be generated by PWM signals with 200 duty ratios changing according to a sine rule. The control unit adopts a singlechip with the model of STC15W4K56S4, the period of the pulse width modulation signal is set to 2400 clock periods, the control unit is realized through a counter of the singlechip, the counter is one clock period after counting once, the number of the periods of the pulse width modulation signal included in a single period of the driving signal is 200, the driving signal is arranged in a register of the singlechip, the 200 periods of the pulse width modulation signal in the single period of the driving signal respectively correspond to duty ratios, 200 duty ratios are obtained, and the 200 duty ratios are arranged in another register of the singlechip. The single chip microcomputer can calculate and obtain high level duration and low level duration of each pulse width modulation signal according to the period 2400 of the pulse width modulation signal and a duty ratio corresponding to the period of each pulse width modulation signal, output a high level within the high level duration, output a low level within the low level duration, zero clearing the counter when the counter reaches 2400 to start outputting the next pulse width modulation signal, and finishing outputting the driving signal in one period when 200 pulse width modulation signals are output. The passive second-order low-pass RC filter filters the pulse width modulation signal output by the single chip microcomputer, the pulse width modulation signal subjected to wave filtering processing is sent to an OP07C single-channel subtracter, the OP07C single-channel subtracter amplifies a difference value obtained by subtracting the preset voltage from the voltage of the pulse width modulation signal to obtain a control signal, the control signal is sent to an LM1875 power amplifier, and the LM1875 power amplifier performs power amplification processing on the control signal to obtain the pulse width modulation sine wave so as to drive corresponding loads.
The triangle wave, sawtooth wave, etc. of the pulse width modulation can be realized by adopting the method, and the details are not repeated here.
The specific process of the method embodiment of the present invention may refer to the descriptions of the above system embodiments, and will not be described herein again.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A driving signal generating system, comprising a control unit, a filter circuit, a bipolar signal converting unit and a power amplifying unit, wherein:
the control unit is used for generating a pulse width modulation signal;
the input end of the filter circuit is connected with the output end of the control unit and is used for filtering the pulse width modulation signal output by the control unit;
the input end of the bipolar signal conversion unit is connected with the output end of the filter circuit and is used for amplifying the difference value obtained by subtracting a preset voltage from the voltage of the pulse width modulation signal to obtain a control signal;
the input end of the power amplification unit is connected with the output end of the bipolar signal conversion unit and used for performing power amplification on the input control signal to generate a driving signal.
2. The system of claim 1, wherein the control unit is a single chip microcomputer, and the single chip microcomputer is of the type STC15W4K56S 4.
3. The system of claim 1, wherein the filtering circuit employs a passive second-order low-pass RC filter.
4. The system of claim 1, wherein the bipolar signal conversion unit employs an OP07C single channel subtractor.
5. The system of claim 1, wherein the power amplification unit employs an LM1875 power amplifier.
6. A method of generating a drive signal, comprising:
the control unit outputs a pulse width modulation signal to the filter circuit according to preset working parameters;
the filter circuit carries out filtering processing on the pulse width modulation signal and sends the pulse width modulation signal subjected to filtering processing to a bipolar signal conversion unit;
the bipolar signal conversion unit obtains a control signal after amplifying a difference value obtained by subtracting a preset voltage from the voltage of the pulse width modulation signal, and sends the control signal to the power amplification unit;
the power amplification unit is used for carrying out power amplification on the input control signal to generate a driving signal.
7. The method of claim 6, wherein the operating parameter comprises a period of a pulse width modulation signal, a number of periods of the pulse width modulation signal included in a single period of the drive signal, and a duty cycle corresponding to each period of the pulse width modulation signal in the single period of the drive signal.
8. The method of claim 7, wherein the operating parameter further comprises a clock of the pulse width modulated signal.
9. The method according to any of claims 6 to 8, wherein the drive signal is a pulse width modulated sine wave, a triangular wave or a sawtooth wave.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1574586A (en) * | 2003-05-14 | 2005-02-02 | 三星电子株式会社 | High voltage power supply apparatus and method of correcting current output from the apparatus |
| CN201107396Y (en) * | 2007-10-19 | 2008-08-27 | 江苏科技大学 | Direct-current power supply analog device |
| CN101523723A (en) * | 2006-09-05 | 2009-09-02 | 奥迪姆半导体有限公司 | Switching amplifier |
| CN101714853A (en) * | 2009-11-20 | 2010-05-26 | 恩平市西特尔数码科技有限公司 | Bipolar soft-switching PWM power amplifier |
| CN201577030U (en) * | 2009-11-20 | 2010-09-08 | 恩平市西特尔数码科技有限公司 | PWM power amplifier for bipolar soft switch |
| CN102611387A (en) * | 2012-03-07 | 2012-07-25 | 北京优科利尔能源设备有限公司 | Small-signal controller and method for simulating three-phase alternating-current power grid |
| CN104836554A (en) * | 2015-05-11 | 2015-08-12 | 江苏宏云技术有限公司 | Realization method of multifunctional SPWM |
| CN205683402U (en) * | 2016-04-27 | 2016-11-16 | 王恒伟 | A kind of potential therapeutic instrument with output electric current electrical measurement function |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0343355Y2 (en) * | 1984-10-11 | 1991-09-11 | ||
| US9036378B2 (en) * | 2013-02-04 | 2015-05-19 | Inno-Tech Co., Ltd. | Power conversion system with adjustable frequency |
-
2018
- 2018-05-30 CN CN201810539685.5A patent/CN108762372B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1574586A (en) * | 2003-05-14 | 2005-02-02 | 三星电子株式会社 | High voltage power supply apparatus and method of correcting current output from the apparatus |
| CN101523723A (en) * | 2006-09-05 | 2009-09-02 | 奥迪姆半导体有限公司 | Switching amplifier |
| CN201107396Y (en) * | 2007-10-19 | 2008-08-27 | 江苏科技大学 | Direct-current power supply analog device |
| CN101714853A (en) * | 2009-11-20 | 2010-05-26 | 恩平市西特尔数码科技有限公司 | Bipolar soft-switching PWM power amplifier |
| CN201577030U (en) * | 2009-11-20 | 2010-09-08 | 恩平市西特尔数码科技有限公司 | PWM power amplifier for bipolar soft switch |
| CN102611387A (en) * | 2012-03-07 | 2012-07-25 | 北京优科利尔能源设备有限公司 | Small-signal controller and method for simulating three-phase alternating-current power grid |
| CN104836554A (en) * | 2015-05-11 | 2015-08-12 | 江苏宏云技术有限公司 | Realization method of multifunctional SPWM |
| CN205683402U (en) * | 2016-04-27 | 2016-11-16 | 王恒伟 | A kind of potential therapeutic instrument with output electric current electrical measurement function |
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