CN111509954A - Correction control method and device for pulse width modulation signal and switching power supply - Google Patents
Correction control method and device for pulse width modulation signal and switching power supply Download PDFInfo
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- CN111509954A CN111509954A CN202010454899.XA CN202010454899A CN111509954A CN 111509954 A CN111509954 A CN 111509954A CN 202010454899 A CN202010454899 A CN 202010454899A CN 111509954 A CN111509954 A CN 111509954A
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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
- H02M1/00—Details of apparatus for conversion
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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
- 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
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
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Abstract
The application discloses a correction control method and device of a pulse width modulation signal and a switching power supply, wherein the method and the device are applied to the switching power supply with a full-bridge topological structure rectifying circuit, and the specific scheme is that when the switching power supply runs, timing is carried out; and when the timing meets a preset condition, controlling a first duty ratio of the first pulse width modulation signal to be the same as a second duty ratio of the second pulse width modulation signal. The driving signals on the bridge arms are reset according to a certain period, so that the duty ratios of the first pulse width modulation signal and the second pulse width modulation signal are the same, the conduction time of the first switching element and the conduction time of the second switching element of the switching power supply are the same, and the problem that the switching power supply cannot work normally due to unequal volt-second products on two sides is solved.
Description
Technical Field
The present disclosure relates to the field of power supply technologies, and in particular, to a method and an apparatus for controlling correction of a pulse width modulation signal, and a switching power supply.
Background
A Switching Mode Power Supply (SMPS), also called a switching Power Supply, a switching converter, or the like, is a high-frequency Power conversion device, and is a Power Supply. The function is to convert a certain input voltage into a voltage or a current required by a user terminal through different types of topological structures. The input of the switching power supply is generally an ac power supply, a commercial power supply or a dc power supply, and the output is used to supply power to a device, such as a personal computer, which needs a dc power supply, that is, the switching power supply is used to realize voltage or current conversion between the two.
Fig. 1 is a schematic diagram of a switching power supply of a full-bridge topology, which includes 4 switching elements k1, k2, k3 and k4 for implementing rectification, each of which is turned on or off under the control of a control signal, thereby implementing rectification of an ac power supply. The first switching element k1 and the third switching element k3 perform switching under the driving of a group of pulse width modulation signals drv 1; meanwhile, the second switching element and the second switching element k2 and the fourth switching element k4 perform switching under the driving of another set of pwm signals drv 2.
When the switching power supply works, the drv1 and the drv2 have the same duty ratio, and the switching power supply works normally. In practice, the inventor of the present application finds that when the input voltage changes, the load changes, or the switching power supply operates under working conditions such as startup, the duty ratios of drv1 and drv2 may not be equal, that is, the on-time of the first switching element k1 and the on-time of the second switching element k2 are different, which may cause the voltage-second products on both sides of the switching power supply to be unequal, so that the transformer magnetic bias and the transformer saturation occur, and the switching power supply may not operate normally.
Disclosure of Invention
In view of this, the present application provides a method and an apparatus for controlling a pwm signal correction, and a switching power supply, so as to make the on-time of a first switching element the same as the on-time of a second switching element, so as to avoid that the switching power supply cannot work normally due to unequal volt-second products on two sides.
In order to achieve the above object, the following solutions are proposed:
a correction control method of pulse width modulation signals is applied to a switching power supply, a rectifying circuit of the switching power supply is of a full-bridge topological structure and comprises a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm, driving signals of the first bridge arm and the third bridge arm are first pulse width modulation signals, driving signals of the second bridge arm and the fourth bridge arm are second pulse width modulation signals, and the correction control method comprises the following steps:
when the switching power supply operates, timing is carried out;
and when the timing meets a preset condition, controlling a first duty ratio of the first pulse width modulation signal to be the same as a second duty ratio of the second pulse width modulation signal.
Optionally, the timing includes:
accumulating according to a preset time length by taking 0 as an initial value;
and clearing the count value through the preset time length when the current count is 1.
Optionally, when the timing meets a preset condition, controlling a first duty cycle of the first pwm signal to be the same as a second duty cycle of the second pwm signal, including:
when the count value is 0 or 1, correcting the second duty ratio according to the first duty ratio so as to enable the second duty ratio to be the same as the first duty ratio;
or when the count value is 0 or 1, correcting the first duty ratio according to the second duty ratio so that the first duty ratio is the same as the second duty ratio.
A correction control device of pulse width modulation signals is applied to a switching power supply, a rectifying circuit of the switching power supply is of a full-bridge topology structure and comprises a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm, driving signals of the first bridge arm and the third bridge arm are first pulse width modulation signals, driving signals of the second bridge arm and the fourth bridge arm are second pulse width modulation signals, and the correction control device comprises:
a timing module configured to time when the switching power supply is operated;
the execution module is configured to control a first duty ratio of the first pulse width modulation signal to be the same as a second duty ratio of the second pulse width modulation signal when timing meets a preset condition.
Optionally, the timing module includes:
the accumulation control unit is configured to accumulate the data according to a preset time length by taking 0 as an initial value;
and the zero clearing control unit is configured to zero the count value after the preset time length when the current count is 1.
Optionally, the execution module includes a first execution unit or a second execution unit, where:
the first execution unit is used for correcting the second duty ratio according to the first duty ratio when the count value is 0 or 1, so that the second duty ratio is the same as the first duty ratio;
the second execution unit is configured to, when the count value is 0 or 1, correct the first duty ratio according to the second duty ratio so that the first duty ratio is the same as the second duty ratio.
A switching power supply characterized by being provided with the correction control device as described above.
A switching power supply comprising a controller, wherein the controller comprises at least one processor and a memory coupled to the processor, wherein:
the memory is for storing a computer program or instructions;
the processor is configured to acquire and execute the computer program or the instructions to cause the controller to execute the correction control method as described above.
According to the technical scheme, the method and the device for controlling the correction of the pulse width modulation signal are applied to the switching power supply with the full-bridge topological structure rectifying circuit, and the specific scheme is that when the switching power supply runs, timing is carried out; and when the timing meets a preset condition, controlling a first duty ratio of the first pulse width modulation signal to be the same as a second duty ratio of the second pulse width modulation signal. The driving signals on the bridge arms are reset according to a certain period, so that the duty ratios of the first pulse width modulation signal and the second pulse width modulation signal are the same, the conduction time of the first switching element and the conduction time of the second switching element of the switching power supply are the same, and the problem that the switching power supply cannot work normally due to unequal volt-second products on two sides is solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a switching power supply of a full-bridge topology;
FIG. 2 is a schematic diagram of a full bridge topology in accordance with an embodiment;
fig. 3 is a flowchart of a method for controlling modification of a pwm signal according to an embodiment of the present application;
fig. 4 is a block diagram of a modification control device for a pwm signal according to an embodiment of the present application;
fig. 5 is a block diagram of another pwm signal modification control apparatus according to an embodiment of the present application;
fig. 6 is a block diagram of another modification control device for pwm signals according to an embodiment of the present application;
fig. 7 is a block diagram of a controller according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
Fig. 3 is a flowchart of a method for controlling modification of a pwm signal according to an embodiment of the present disclosure.
The correction control method provided by the embodiment is applied to the switching power supply, and particularly applied to a controller of the switching power supply. The rectifying circuit of the switching power supply is of a full-bridge topology structure, and comprises a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm, as shown in fig. 2, wherein the first bridge arm is provided with a first switching element k1, the second bridge arm is provided with a second switching element k2, the third bridge arm is provided with a third switching element k3, and the fourth bridge arm is provided with a fourth switching element k 4. The switching element in the application is an IGBT element, an MOS element or other elements with switching action.
The first switching element and the third switching element are driven by a group of driving signals, and the driving signals are first pulse width modulation signals; the second switching element and the fourth switching element are driven by another set of driving signals, and the driving signals are second pulse width modulation signals.
As shown in fig. 1, the correction control method specifically includes the following steps:
and S1, timing when the switching power supply operates.
During normal startup and subsequent operation of the switching power supply, particularly when the input voltage changes, the load changes or the switching power supply works under working conditions such as startup and the like, a data space is opened up as a timer based on the MCU, and timing is performed according to a certain rule, specifically, timing can be performed in the following way:
first, the timer is set to zero, and the zero is accumulated as an initial value of the timing, and the timing value of the timer may be limited to 0 and 1. The timing unit can be determined according to practical conditions, such as taking each switching cycle as a timing unit.
Then, in the timing process, when the current timing value is 1, namely the timing value becomes 1, the timer is cleared after a timing unit, so that the timing value of the timer is circulated between 0 and 1.
We regard the count value of the timer as 0 or 1 as meeting the preset condition.
And S2, controlling the duty ratio of the first pulse width modulation signal and the second pulse width modulation signal to be the same.
Specifically, in this embodiment, when the preset condition is satisfied, the duty ratio of the first pwm signal and the duty ratio of the second pwm signal are adjusted to be the same when the timing value of the timer is 0 or 1.
During the specific adjustment, the duty ratio of the second pwm signal may be adjusted based on the duty ratio of the first pwm signal, so that the duty ratio of the second pwm signal is consistent with the duty ratio of the first pwm signal; or the duty ratio of the first pulse width modulation signal is adjusted by taking the duty ratio of the second pulse width modulation signal as a standard so as to enable the duty ratio of the first pulse width modulation signal to be consistent with the duty ratio of the second pulse width modulation signal.
It can be seen from the above technical solutions that, the present embodiment provides a method for controlling correction of a pulse width modulation signal, which is applied to a switching power supply having a full-bridge topology rectifier circuit, and specifically, when the switching power supply is in operation, timing is performed; and when the timing meets a preset condition, controlling a first duty ratio of the first pulse width modulation signal to be the same as a second duty ratio of the second pulse width modulation signal. The driving signals on the bridge arms are reset according to a certain period, so that the duty ratios of the first pulse width modulation signal and the second pulse width modulation signal are the same, the conduction time of the first switching element and the conduction time of the second switching element of the switching power supply are the same, and the problem that the switching power supply cannot work normally due to unequal volt-second products on two sides is solved.
Example two
Fig. 4 is a block diagram of a modification control device for a pwm signal according to an embodiment of the present application.
The correction control device provided by the embodiment is applied to the switching power supply, and particularly applied to a controller of the switching power supply. The rectifying circuit of the switching power supply is of a full-bridge topology structure, and as shown in fig. b2, the rectifying circuit of the switching power supply comprises a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm, wherein the first bridge arm is provided with a first switching element k1, the second bridge arm is provided with a second switching element k2, the third bridge arm is provided with a third switching element k3, and the fourth bridge arm is provided with a fourth switching element k 4. The switching element in the application is an IGBT element, an MOS element or other elements with switching action.
The first switching element and the third switching element are driven by a group of driving signals, and the driving signals are first pulse width modulation signals; the second switching element and the fourth switching element are driven by another set of driving signals, and the driving signals are second pulse width modulation signals.
As shown in fig. 2, the correction control apparatus specifically includes a timing module 10 and an execution module 20.
The timing module is used for timing when the switching power supply runs.
That is, during normal startup and subsequent operation of the switching power supply, particularly during transient operations such as input voltage change, load change or startup, a data space is created as a timer based on the MCU, and timing is performed according to a certain rule, and the module includes an accumulation control unit 11 and a zero clearing control unit 12, as shown in fig. 5.
The accumulation control unit is used for setting the timer to zero and accumulating the zero as an initial value of the timing, and the timing value of the timer can be limited to 0 and 1. The timing unit can be determined according to practical conditions, such as taking each switching cycle as a timing unit.
The zero clearing control unit is used for clearing the timer when the current timing value is 1 in the timing process, namely after a timing unit passes after the timing value becomes 1, so that the timing value of the timer is circulated between 0 and 1.
We regard the count value of the timer as 0 or 1 as meeting the preset condition.
The execution module is used for controlling the duty ratio of the first pulse width modulation signal to be the same as that of the second pulse width modulation signal.
Specifically, in this embodiment, when the preset condition is satisfied, the duty ratio of the first pwm signal and the duty ratio of the second pwm signal are adjusted to be the same when the timing value of the timer is 0 or 1. The execution module specifically includes a first execution unit 21 and a second execution unit 22, which do not work simultaneously, as shown in fig. 6.
During specific adjustment, the first execution unit is used for adjusting the duty ratio of the second pulse width modulation signal by taking the duty ratio of the first pulse width modulation signal as a standard so as to enable the duty ratio of the second pulse width modulation signal to be consistent with the duty ratio of the first pulse width modulation signal; the second execution unit is used for adjusting the duty ratio of the first pulse width modulation signal by taking the duty ratio of the second pulse width modulation signal as a standard so as to enable the duty ratio of the first pulse width modulation signal to be consistent with the duty ratio of the second pulse width modulation signal.
It can be seen from the above technical solutions that, the present embodiment provides a correction control device for a pulse width modulation signal, and the method is applied to a switching power supply having a full-bridge topology rectifier circuit, and the specific solution is to perform timing when the switching power supply is running; and when the timing meets a preset condition, controlling a first duty ratio of the first pulse width modulation signal to be the same as a second duty ratio of the second pulse width modulation signal. The driving signals on the bridge arms are reset according to a certain period, so that the duty ratios of the first pulse width modulation signal and the second pulse width modulation signal are the same, the conduction time of the first switching element and the conduction time of the second switching element of the switching power supply are the same, and the problem that the switching power supply cannot work normally due to unequal volt-second products on two sides is solved.
EXAMPLE III
The embodiment provides a switching power supply, a rectifying circuit of which is a full-bridge topology structure, and as shown in fig. 2, the switching power supply includes a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm, the first bridge arm is provided with a first switching element k1, the second bridge arm is provided with a second switching element k2, the third bridge arm is provided with a third switching element k3, and the fourth bridge arm is provided with a fourth switching element k 4. The switching element in the application is an IGBT element, an MOS element or other elements with switching action.
The first switching element and the third switching element are driven by a group of driving signals, and the driving signals are first pulse width modulation signals; the second switching element and the fourth switching element are driven by another set of driving signals, and the driving signals are second pulse width modulation signals.
The switching power supply is provided with a correction control device, and the correction control device specifically comprises a timing module and an execution module.
The timing module is used for timing when the switching power supply runs.
During normal startup and subsequent operation of the switching power supply, a data space is opened up based on the MCU to serve as a timer, and timing is carried out according to a certain rule.
The accumulation control unit is used for setting the timer to zero and accumulating the zero as an initial value of the timing, and the timing value of the timer can be limited to 0 and 1. The timing unit can be determined according to practical conditions, such as taking each switching cycle as a timing unit.
The zero clearing control unit is used for clearing the timer when the current timing value is 1 in the timing process, namely after a timing unit passes after the timing value becomes 1, so that the timing value of the timer is circulated between 0 and 1.
We regard the count value of the timer as 0 or 1 as meeting the preset condition.
The execution module is used for controlling the duty ratio of the first pulse width modulation signal to be the same as that of the second pulse width modulation signal.
Specifically, in this embodiment, when the preset condition is satisfied, the duty ratio of the first pwm signal and the duty ratio of the second pwm signal are adjusted to be the same when the timing value of the timer is 0 or 1. The execution module specifically includes a first execution unit and a second execution unit, which do not work simultaneously.
During specific adjustment, the first execution unit is used for adjusting the duty ratio of the second pulse width modulation signal by taking the duty ratio of the first pulse width modulation signal as a standard so as to enable the duty ratio of the second pulse width modulation signal to be consistent with the duty ratio of the first pulse width modulation signal; the second execution unit is used for adjusting the duty ratio of the first pulse width modulation signal by taking the duty ratio of the second pulse width modulation signal as a standard so as to enable the duty ratio of the first pulse width modulation signal to be consistent with the duty ratio of the second pulse width modulation signal.
The correction control device can ensure that the duty ratios of the first pulse width modulation signal and the second pulse width modulation signal are the same by resetting the driving signals on each bridge arm according to a certain period, so that the conduction time of the first switching element and the conduction time of the second switching element of the switching power supply are the same, and the problem that the switching power supply cannot work normally due to unequal volt-second products on two sides is solved.
Example four
FIG. 7 is a block diagram of a controller according to an embodiment of the present application
The embodiment provides a switching power supply, a rectifying circuit of which is a full-bridge topology structure, and as shown in fig. 2, the switching power supply includes a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm, the first bridge arm is provided with a first switching element k1, the second bridge arm is provided with a second switching element k2, the third bridge arm is provided with a third switching element k3, and the fourth bridge arm is provided with a fourth switching element k 4. The switching element in the application is an IGBT element, an MOS element or other elements with switching action.
The first switching element and the third switching element are driven by a group of driving signals, and the driving signals are first pulse width modulation signals; the second switching element and the fourth switching element are driven by another set of driving signals, and the driving signals are second pulse width modulation signals.
The switching power supply is provided with a controller, which as shown in fig. 7 is provided with at least one processor 101 and a memory 102, both connected by a data bus 103. The memory is used for storing computer programs or instructions, and the processor is used for acquiring and executing the computer programs or instructions, so that the controller can execute the following control steps:
and S1, timing when the switching power supply operates.
During normal startup and subsequent operation of the switching power supply, a data space is opened up as a timer based on the MCU, and timing is performed according to a certain rule, specifically, timing can be performed in the following manner:
first, the timer is set to zero, and the zero is accumulated as an initial value of the timing, and the timing value of the timer may be limited to 0 and 1. The timing unit can be determined according to practical conditions, such as taking each switching cycle as a timing unit.
Then, in the timing process, when the current timing value is 1, namely the timing value becomes 1, the timer is cleared after a timing unit, so that the timing value of the timer is circulated between 0 and 1.
We regard the count value of the timer as 0 or 1 as meeting the preset condition.
And S2, controlling the duty ratio of the first pulse width modulation signal and the second pulse width modulation signal to be the same.
Specifically, in this embodiment, when the preset condition is satisfied, the duty ratio of the first pwm signal and the duty ratio of the second pwm signal are adjusted to be the same when the timing value of the timer is 0 or 1.
During the specific adjustment, the duty ratio of the second pwm signal may be adjusted based on the duty ratio of the first pwm signal, so that the duty ratio of the second pwm signal is consistent with the duty ratio of the first pwm signal; or the duty ratio of the first pulse width modulation signal is adjusted by taking the duty ratio of the second pulse width modulation signal as a standard so as to enable the duty ratio of the first pulse width modulation signal to be consistent with the duty ratio of the second pulse width modulation signal.
According to the scheme, the driving signals on the bridge arms are reset according to a certain period, so that the duty ratios of the first pulse width modulation signal and the second pulse width modulation signal are the same, the conduction time of the first switching element and the conduction time of the second switching element of the switching power supply are the same, and the problem that the switching power supply cannot work normally due to unequal volt-second products on two sides is solved.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The technical solutions provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the descriptions of the above examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A correction control method of pulse width modulation signals is applied to a switching power supply, a rectifying circuit of the switching power supply is of a full-bridge topological structure and comprises a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm, driving signals of the first bridge arm and the third bridge arm are first pulse width modulation signals, and driving signals of the second bridge arm and the fourth bridge arm are second pulse width modulation signals, and the correction control method is characterized by comprising the following steps of:
when the switching power supply operates, timing is carried out;
and when the timing meets a preset condition, controlling a first duty ratio of the first pulse width modulation signal to be the same as a second duty ratio of the second pulse width modulation signal.
2. The correction control method according to claim 1, wherein the timing includes the steps of:
accumulating according to a preset time length by taking 0 as an initial value;
and clearing the count value through the preset time length when the current count is 1.
3. The correction control method according to claim 2, wherein when the timing satisfies a preset condition, controlling a first duty ratio of the first pulse width modulation signal to be the same as a second duty ratio of the second pulse width modulation signal comprises the steps of:
when the count value is 0 or 1, correcting the second duty ratio according to the first duty ratio so as to enable the second duty ratio to be the same as the first duty ratio;
or when the count value is 0 or 1, correcting the first duty ratio according to the second duty ratio so that the first duty ratio is the same as the second duty ratio.
4. A correction control device of pulse width modulation signals is applied to a switching power supply, a rectifying circuit of the switching power supply is of a full-bridge topology structure and comprises a first bridge arm, a second bridge arm, a third bridge arm and a fourth bridge arm, driving signals of the first bridge arm and the third bridge arm are first pulse width modulation signals, and driving signals of the second bridge arm and the fourth bridge arm are second pulse width modulation signals, and the correction control device is characterized by comprising:
a timing module configured to time when the switching power supply is operated;
the execution module is configured to control a first duty ratio of the first pulse width modulation signal to be the same as a second duty ratio of the second pulse width modulation signal when timing meets a preset condition.
5. The corrective control device of claim 4, wherein the timing module includes:
the accumulation control unit is configured to accumulate the data according to a preset time length by taking 0 as an initial value;
and the zero clearing control unit is configured to zero the count value after the preset time length when the current count is 1.
6. The correction control apparatus according to claim 5, wherein the execution module includes a first execution unit or a second execution unit, wherein:
the first execution unit is used for correcting the second duty ratio according to the first duty ratio when the count value is 0 or 1, so that the second duty ratio is the same as the first duty ratio;
the second execution unit is configured to, when the count value is 0 or 1, correct the first duty ratio according to the second duty ratio so that the first duty ratio is the same as the second duty ratio.
7. A switching power supply characterized by being provided with the correction control device as set forth in any one of claims 4 to 6.
8. A switching power supply comprising a controller, wherein the controller comprises at least one processor and a memory coupled to the processor, wherein:
the memory is for storing a computer program or instructions;
the processor is used for acquiring and executing the computer program or the instructions so as to cause the controller to execute the correction control method according to any one of claims 1 to 3.
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Cited By (1)
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| CN114221529A (en) * | 2021-12-16 | 2022-03-22 | 珠海格力电器股份有限公司 | Bridge circuit driving method, bridge circuit driving device, bridge circuit control system and ultrasonic equipment |
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| CN114221529B (en) * | 2021-12-16 | 2024-05-03 | 珠海格力电器股份有限公司 | Driving method and device of bridge circuit, control system and ultrasonic equipment |
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Application publication date: 20200807 |