CN113179037A - Switching frequency modulation method and device and storage medium - Google Patents

Switching frequency modulation method and device and storage medium Download PDF

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Publication number
CN113179037A
CN113179037A CN202110504133.2A CN202110504133A CN113179037A CN 113179037 A CN113179037 A CN 113179037A CN 202110504133 A CN202110504133 A CN 202110504133A CN 113179037 A CN113179037 A CN 113179037A
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frequency
modulation
switching
wave
region
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CN202110504133.2A
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CN113179037B (en
Inventor
张永征
邓占锋
尉志勇
赵国亮
苑立国
李士林
刘勇
穆永保
杨海运
宫艳朝
吕建中
马立平
史善哲
任茂鑫
周哲
龙云波
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State Grid Corp of China SGCC
State Grid Hebei Electric Power Co Ltd
North China Electric Power University
Global Energy Interconnection Research Institute
State Grid Shanghai Electric Power Co Ltd
Handan Power Supply Co of State Grid Hebei Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
State Grid Hebei Electric Power Co Ltd
North China Electric Power University
Global Energy Interconnection Research Institute
State Grid Shanghai Electric Power Co Ltd
Handan Power Supply Co of State Grid Hebei Electric Power Co Ltd
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Priority to CN202110504133.2A priority Critical patent/CN113179037B/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention discloses a modulation method, a device and a storage medium of switching frequency, wherein a triangular carrier wave and a modulation wave are applied to a switch, and the modulation method comprises the following steps: changing the frequency of the triangular carrier wave to generate a switching signal comprising a first frequency, a second frequency and a third frequency, wherein the first frequency is greater than the second frequency; and controlling the switch to work according to the switch signal in a half modulation wave period. By implementing the invention, the higher harmonic components in the network access current and the grid-connected voltage in the power electronic device are reduced by adjusting the switching frequency contained in the switching signal. The risk of generating large resonant current by high-frequency resonance of a power grid is reduced, the loss of a switching device caused by the increase of the switching action times is avoided, high-frequency alternating components passing through other devices such as a capacitor and an inductor in a power electronic device are reduced, and the loss of the devices is reduced.

Description

Switching frequency modulation method and device and storage medium
Technical Field
The invention relates to the technical field of power electronics, in particular to a method and a device for modulating switching frequency and a storage medium.
Background
With the development of new energy power generation and flexible power transmission technologies, the application of power electronic devices in power grids is more and more extensive. The power electronic device is used as a harmonic source, and higher harmonics output to a power grid influence the power quality of the power grid, cause high-frequency resonance and possibly generate large high-frequency resonance current. The high-frequency tolerance of the traditional equipment in the power grid is very limited, and the larger high-frequency resonant current can directly cause the damage of the corresponding equipment in the power grid.
Increasing the switching frequency of a power electronic device can effectively reduce harmonic output, but this increases the cost of the device, and increases the number of operations per unit time, which greatly increases the loss of the switching device. Other devices in the whole apparatus will also generate larger loss due to the increase of the passing high frequency alternating component. The increase in loss shortens the life of each device and increases the heat dissipation capacity and cost of power electronic equipment in engineering construction.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method, an apparatus, and a storage medium for modulating a switching frequency, so as to solve the technical problem in the prior art that designing a motor controller of an electric vehicle by using manual layout wastes time and labor.
The technical scheme provided by the invention is as follows:
a first aspect of an embodiment of the present invention provides a method for modulating a switching frequency, where a triangular carrier and a modulated wave are applied to a switch, and the method includes: changing the frequency of the triangular carrier wave to generate a switching signal comprising a first frequency, a second frequency and a third frequency, wherein the first frequency is greater than the second frequency; and controlling the switch to work according to the switch signal in a half modulation wave period.
Optionally, changing the frequency of the triangular carrier comprises: dividing one half of the modulation wave period into a first region, a second region and a third region according to the amplitude of the modulation wave; and changing the frequency of the triangular carrier waves in the three areas, so that a switching signal with a first frequency is generated in the first area, a switching signal with a second frequency is generated in the second area, and a switching signal with a third frequency is generated in the third area.
Optionally, the amplitude of the modulated wave in the first region is smaller than the amplitude of the modulated wave in the second region, and the amplitude of the modulated wave in the second region is smaller than the amplitude of the modulated wave in the third region.
Optionally, after dividing one-half of the modulation wave period into a first region, a second region, and a third region according to the amplitude of the modulation wave, the method further includes: judging whether the modulation degree of the modulation wave is greater than a preset value; when the modulation degree of the modulation wave is larger than a preset value, the ranges of the second area and the third area are increased; and when the modulation degree of the modulation wave is smaller than a preset value, reducing the range of the second area and the third area.
Optionally, after changing the frequency of the triangular carrier, the method further includes: the frequency of the triangular carrier in the third region is zero.
Optionally, after changing the frequency of the triangular carrier, the method further includes: in each modulation period, the symmetry of the triangular carrier wave is the same as the symmetry of the modulation wave.
Optionally, after changing the frequency of the triangular carrier, the method further includes: in each modulation period, the carrier frequency is an odd multiple of the modulation wave frequency.
A second aspect of embodiments of the present invention provides a modulation apparatus for a switching frequency, in which a triangular carrier and a modulated wave are applied to a switch, the modulation apparatus including: the modulation module is used for changing the frequency of the triangular carrier wave and generating a switching signal comprising a first frequency, a second frequency and a third frequency, wherein the first frequency is greater than the second frequency, and the third frequency is zero; and the control module is used for controlling the switch to work according to the switch signal in a half modulation wave period.
A third aspect of the embodiments of the present invention provides a computer-readable storage medium, where computer instructions are stored, and the computer instructions are configured to cause the computer to execute the method for modulating the switching frequency according to any one of the first aspect and the first aspect of the embodiments of the present invention.
A fourth aspect of an embodiment of the present invention provides an electronic device, including: the modulation method comprises a memory and a processor, wherein the memory and the processor are connected in communication with each other, the memory stores computer instructions, and the processor executes the computer instructions so as to execute the modulation method of the switching frequency according to any one of the first aspect and the first aspect of the embodiments of the invention.
The technical scheme provided by the invention has the following effects:
according to the modulation method, the modulation device and the storage medium of the switching frequency provided by the embodiment of the invention, the higher harmonic components in the network access current and the grid-connected voltage in the power electronic device are reduced by adjusting the switching frequency contained in the switching signal. The risk of generating large resonant current by high-frequency resonance of a power grid is reduced, the loss of a switching device caused by the increase of the switching action times is avoided, high-frequency alternating components passing through other devices such as a capacitor and an inductor in a power electronic device are reduced, and the loss of the devices 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 other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a modulation method of a switching frequency according to an embodiment of the present invention;
FIG. 2 is a block diagram of a single-phase inverter topology according to an embodiment of the present invention;
fig. 3 is a flowchart of a modulation method of a switching frequency according to another embodiment of the present invention;
fig. 4 is a switching signal diagram of a modulation method of a switching frequency according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a modulated carrier signal of a modulation method of a switching frequency according to an embodiment of the present invention;
fig. 6 is a flowchart of a modulation method of a switching frequency according to another embodiment of the present invention;
FIG. 7 is a schematic diagram of PWM voltage waveforms generated under a conventional SPWM modulation and a modulation method of switching frequency according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a switching frequency modulation method and a conventional SPWM modulated network access current waveform according to an embodiment of the present invention;
FIGS. 9(a) and 9(b) are schematic diagrams of sub-components of network-access current under the modulation of conventional SPWM and the modulation method of switching frequency according to the embodiment of the present invention;
fig. 10(a) and 10(b) are schematic diagrams of grid-connected voltage sub-components under the modulation method of the switching frequency and the conventional SPWM according to the embodiment of the present invention;
FIG. 11 is a schematic diagram of a switching frequency modulation apparatus according to an embodiment of the present invention;
FIG. 12 is a schematic structural diagram of a computer-readable storage medium provided in accordance with an embodiment of the present invention;
fig. 13 is a schematic structural diagram of an electronic device provided in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 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.
The embodiment of the invention provides a modulation method of switching frequency, wherein a triangular carrier wave and a modulation wave are applied to a switch, and as shown in fig. 1, the modulation method comprises the following steps:
step S101: changing the frequency of the triangular carrier wave to generate a switching signal comprising a first frequency, a second frequency and a third frequency, wherein the first frequency is greater than the second frequency, and the third frequency is zero; specifically, a switching operation will be described with a single-phase inverter as an example. Wherein, as shown in fig. 2, the single-phase inverter includes a switching device S1To S4A DC capacitor and a reactor, wherein the DC voltage at two ends of the capacitor is UdcThe grid-connected voltage of the inverter is UgridThe current input to the grid is Igrid. The switch is applied with a triangular carrier wave and a modulation wave, the modulation wave is a power frequency sinusoidal voltage, and the generated switching signal comprises three different switching frequencies, namely a first frequency, a second frequency and a third frequency, by changing the frequency of the triangular carrier wave.
Step S102: and controlling the switch to work according to the switch signal in one half of the modulation wave period. In one embodiment, after the switching signal is obtained by changing the triangular carrier frequency, the switching signal can be used to control the operation of the switching device in the modulation wave in every half cycle. Specifically, for the single-phase inverter shown in fig. 2, after changing the frequency of the triangular carrier, the modulation wave is compared with the frequency signal of the changed triangular carrier, and when the modulation wave signal is larger than the carrier signal, S1、S3Conduction, S2、S4Turning off; when modulating a wave signalWhen the number is smaller than the carrier signal, S2、S4Conduction, S1、S3And (6) turning off.
In an embodiment, since the first frequency is greater than the second frequency and the third frequency is zero, the equivalent switching frequency of the switching signal can be made to be the same as the existing switching frequency by setting the value of the first frequency and the second frequency. That is, the high frequency harmonics output from power electronic devices such as single phase inverters are reduced without changing or increasing the number of switching device operations.
According to the modulation method of the switching frequency provided by the embodiment of the invention, the higher harmonic components in the network access current and the grid-connected voltage in the power electronic device are reduced by adjusting the switching frequency contained in the switching signal. The risk of generating large resonant current by high-frequency resonance of a power grid is reduced, the loss of a switching device caused by the increase of the switching action times is avoided, high-frequency alternating components passing through other devices such as a capacitor and an inductor in a power electronic device are reduced, and the loss of the devices is reduced.
Compared with the SPWM modulation mode which is commonly used at present, the switching frequency modulation method provided by the embodiment of the invention reduces higher harmonic components in the network access current and the grid-connected voltage of the power electronic device under the condition that the equivalent switching frequency is not changed, namely under the condition that the action times of a switching device are not increased.
In one embodiment, as shown in fig. 3, the step S101 of changing the frequency of the triangular carrier includes the following steps:
step S201: dividing one half of the modulation wave period into a first region, a second region and a third region according to the amplitude of the modulation wave; in an embodiment, when the frequency of the triangular carrier is changed, adjustment may be made based on the amplitude of the modulation wave. Specifically, as shown in fig. 4, since the adopted modulation wave is a sine wave, each half cycle of the modulation wave can be divided into three regions according to the magnitude of the modulation wave amplitude within one half cycle of the modulation wave, wherein the modulation wave amplitude of the first region is smaller than the modulation wave amplitude of the second region, and the modulation wave amplitude of the second region is smaller than the modulation wave amplitude of the third region. That is, the amplitude of the modulated wave in the third region is the largest, the amplitude of the modulated wave in the second region is the second, and the amplitude of the modulated wave in the first region is the smallest.
Step S202: the frequency of the triangular carrier wave in the three regions is changed, so that a switching signal of a first frequency is generated in the first region, a switching signal of a second frequency is generated in the second region, and a switching signal of a third frequency is generated in the third region. Specifically, as shown in fig. 5, after the modulation wave is divided into three regions, the sizes of the triangular carriers may be set corresponding to the three regions, so that the triangular carrier frequency is the largest in the first region, the triangular carrier frequency is the second of the triangular carrier frequency in the second region, and the frequency of the triangular carrier in the third region is zero.
It should be noted that when the first frequency is adopted in the first region, the second frequency is adopted in the second region, and the third frequency is adopted in the third region, fixed frequencies are adopted in the first region, the second region, and the third region, that is, the frequency in each region is fixed, and the frequency is different between the regions.
In one embodiment, as shown in fig. 6, after dividing one-half of the modulation wave period into a first region, a second region and a third region according to the amplitude of the modulation wave, the method further includes the steps of:
step S301: and judging whether the modulation degree of the modulation wave is greater than a preset value.
Step S302: when the modulation degree of the modulation wave is larger than a preset value, the ranges of the second area and the third area are increased.
Step S303: when the modulation degree of the modulation wave is smaller than a preset value, the ranges of the second area and the third area are reduced.
Specifically, for the division of the three areas in the modulated wave, the modulation degree of the modulated wave may be used as a reference, and when the modulation degree of the modulated wave is greater than a preset value, that is, the modulation degree is greater, the ranges of the second area and the third area may be appropriately increased; when the modulation degree of the modulation wave is smaller than the preset value, that is, the modulation degree is small, the ranges of the second area and the third area can be appropriately narrowed. Wherein the preset value can be set based on the structure of the power electronic device to be modulated.
In one embodiment, since different triangular carrier frequencies are used in the first region, the second region and the third region, the triangular carrier frequencies are switched between different regions. In frequency switching, the phase of the triangular carrier wave is ensured not to change suddenly. Specifically, some existing techniques can be adopted to realize that the phase does not change suddenly when the frequency of the triangular carrier changes.
In one embodiment, the changing the frequency of the triangular carrier further comprises: in each modulation period, the symmetry of the triangular carrier wave and the symmetry of the modulation wave are the same. In particular, the symmetry may be an axial symmetry or a central symmetry. If the modulated wave is symmetrical about the center, the changed triangular carrier is also symmetrical about the center. If the modulated wave is symmetrical about the axis, the changed triangular carrier is also symmetrical about the axis.
In one embodiment, the changing the frequency of the triangular carrier further comprises: in each modulation period, the carrier frequency is an odd multiple of the modulation wave frequency. Specifically, if the modulation wave frequency is n, the changed carrier frequency is X n, where X is an odd number.
In one embodiment, when modulating the switching frequency of the switching device in the single-phase inverter shown in fig. 2, the modulation method in the above embodiment and the conventional SPWM are compared; the equivalent switching frequency is ensured to be the same under the two modulation modes, and the grid-connected voltage U under the two modulation modes is comparedgirdCurrent I to the gridgrid。
Wherein, the equivalent switching frequency is 1250Hz, the same modulation wave, reactor and the same voltage U at two ends of the capacitor are adopteddcU output by adopting the switching frequency modulation method and the traditional SPWMpwmAs shown in fig. 7, the network-entry current waveform is shown in fig. 8. It can be seen that the current input into the power grid is distorted more obviously near the peak value by adopting the traditional SPWM mode.
Fourier analysis of the network-entry current shown in fig. 8 was performed, and the results are shown in fig. 9(a) and 9 (b). It can be seen that, when the traditional SPWM modulation method is adopted, the harmonic waves input to the power grid by the inverter are mainly concentrated in the high frequency band, i.e., around the switching frequency of 25 times; when a variable switching frequency modulation mode is adopted, the high-frequency section network-accessing harmonic wave is obviously reduced, and the harmonic wave is distributed to lower frequency.
To grid-connected voltage UgridAs a result of the fourier analysis, as shown in fig. 10(a) and 10(b), it can be seen that the entire high-frequency component in the grid-connected voltage is reduced by the switching frequency modulation method according to this embodiment. Calculate U within 31gridThe total harmonic distortion rate of the obtained variable switching frequency is 2% lower than that of the traditional SPWM mode.
An embodiment of the present invention further provides a modulation apparatus for switching frequency, as shown in fig. 11, where a triangular carrier and a modulated wave are applied to a switch, and the modulation apparatus includes:
the modulation module 1 is used for changing the frequency of the triangular carrier wave and generating a switching signal comprising a first frequency, a second frequency and a third frequency, wherein the first frequency is greater than the second frequency, and the third frequency is zero; for details, refer to the related description of step S101 in the above method embodiment.
And the control module 2 is used for controlling the switch to work according to the switch signal in a half modulation wave period. For details, refer to the related description of step S102 in the above method embodiment.
According to the modulation device of the switching frequency provided by the embodiment of the invention, the higher harmonic components in the network access current and the grid-connected voltage in the power electronic device are reduced by adjusting the switching frequency contained in the switching signal. The risk of generating large resonant current by high-frequency resonance of a power grid is reduced, the loss of a switching device caused by the increase of the switching action times is avoided, high-frequency alternating components passing through other devices such as a capacitor and an inductor in a power electronic device are reduced, and the loss of the devices is reduced.
Compared with the SPWM modulation mode which is commonly used at present, the switching frequency modulation device provided by the embodiment of the invention reduces higher harmonic components in the network access current and the grid-connected voltage of the power electronic device under the condition that the equivalent switching frequency is not changed, namely under the condition that the action times of a switching device are not increased.
The functional description of the modulation device of the switching frequency provided by the embodiment of the invention refers to the description of the modulation method of the switching frequency in the above embodiment in detail.
An embodiment of the present invention further provides a storage medium, as shown in fig. 12, on which a computer program 601 is stored, and when the instructions are executed by a processor, the steps of the modulation method of the switching frequency in the foregoing embodiments are implemented. The storage medium is also stored with audio and video stream data, characteristic frame data, an interactive request signaling, encrypted data, preset data size and the like. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD) or a Solid State Drive (SSD), etc.; the storage medium may also comprise a combination of memories of the kind described above.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
An embodiment of the present invention further provides an electronic device, as shown in fig. 13, the electronic device may include a processor 51 and a memory 52, where the processor 51 and the memory 52 may be connected by a bus or in another manner, and fig. 13 takes the connection by the bus as an example.
The processor 51 may be a Central Processing Unit (CPU). The Processor 51 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof.
The memory 52, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as the corresponding program instructions/modules in the embodiments of the present invention. The processor 51 executes various functional applications and data processing of the processor, i.e. implementing the modulation method of the switching frequency in the above-described method embodiments, by running non-transitory software programs, instructions and modules stored in the memory 52.
The memory 52 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 51, and the like. Further, the memory 52 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 52 may optionally include memory located remotely from the processor 51, and these remote memories may be connected to the processor 51 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory 52 and when executed by the processor 51 perform a method of modulating the switching frequency as in the embodiment of fig. 1-10.
The details of the electronic device may be understood by referring to the corresponding descriptions and effects in the embodiments shown in fig. 1 to fig. 10, and are not described herein again.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims (10)

1. A method for modulating a switching frequency, wherein a triangular carrier wave and a modulation wave are applied to a switch, the method comprising:
changing the frequency of the triangular carrier wave to generate a switching signal comprising a first frequency, a second frequency and a third frequency, wherein the first frequency is greater than the second frequency;
and controlling the switch to work according to the switch signal in a half modulation wave period.
2. The method of claim 1, wherein changing the frequency of the triangular carrier comprises:
dividing one half of the modulation wave period into a first region, a second region and a third region according to the amplitude of the modulation wave;
and changing the frequency of the triangular carrier waves in the three areas, so that a switching signal with a first frequency is generated in the first area, a switching signal with a second frequency is generated in the second area, and a switching signal with a third frequency is generated in the third area.
3. The method according to claim 2, wherein the amplitude of the modulation wave in the first region is smaller than the amplitude of the modulation wave in the second region, and the amplitude of the modulation wave in the second region is smaller than the amplitude of the modulation wave in the third region.
4. The method of modulating the switching frequency according to claim 2, wherein after dividing one-half of a modulation wave period into a first region, a second region, and a third region according to the amplitude of the modulation wave, further comprising:
judging whether the modulation degree of the modulation wave is greater than a preset value;
when the modulation degree of the modulation wave is larger than a preset value, the ranges of the second area and the third area are increased;
and when the modulation degree of the modulation wave is smaller than a preset value, reducing the range of the second area and the third area.
5. The method of modulating the switching frequency according to claim 2, further comprising, after changing the frequency of the triangular carrier: the frequency of the triangular carrier in the third region is zero.
6. The method of modulating the switching frequency according to claim 1, further comprising, after changing the frequency of the triangular carrier: in each modulation period, the symmetry of the triangular carrier wave is the same as the symmetry of the modulation wave.
7. The method of modulating the switching frequency according to claim 1, further comprising, after changing the frequency of the triangular carrier: in each modulation period, the carrier frequency is an odd multiple of the modulation wave frequency.
8. A modulation apparatus for switching a frequency, wherein a triangular carrier wave and a modulated wave are applied to a switch, said modulation apparatus comprising:
the modulation module is used for changing the frequency of the triangular carrier wave and generating a switching signal comprising a first frequency, a second frequency and a third frequency, wherein the first frequency is greater than the second frequency, and the third frequency is zero;
and the control module is used for controlling the switch to work according to the switch signal in a half modulation wave period.
9. A computer-readable storage medium storing computer instructions for causing a computer to execute the method of modulating a switching frequency according to any one of claims 1 to 7.
10. An electronic device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to perform the method of modulating the switching frequency according to any one of claims 1 to 7.
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