CN114244117A - Control method and control device of low-ripple switching power supply - Google Patents
Control method and control device of low-ripple switching power supply Download PDFInfo
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- CN114244117A CN114244117A CN202111592147.0A CN202111592147A CN114244117A CN 114244117 A CN114244117 A CN 114244117A CN 202111592147 A CN202111592147 A CN 202111592147A CN 114244117 A CN114244117 A CN 114244117A
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- 238000004590 computer program Methods 0.000 claims description 19
- 238000004891 communication Methods 0.000 claims description 13
- 238000007750 plasma spraying Methods 0.000 abstract description 11
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- 230000008569 process Effects 0.000 description 10
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- 230000008878 coupling Effects 0.000 description 3
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
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Abstract
The invention provides a control method and a control device of a low-ripple switching power supply. The low-ripple switching power supply comprises N Buck circuits connected in parallel, wherein each Buck circuit comprises a switch tube group consisting of M switch tubes connected in parallel, a diode group consisting of M diodes connected in parallel and an energy storage inductor; the method comprises the following steps: determining the phase of a target switching tube; determining 360 °/N as a first phase difference and 360 °/N/M as a second phase difference; determining the phases of the N multiplied by M switching tubes based on the phase of the target switching tube, the first phase difference and the second phase difference; and generating driving signals of the N multiplied by M switching tubes based on the phases of the N multiplied by M switching tubes. The invention can reduce the current ripple of the output current in the switching power supply and improve the fineness degree of plasma spraying processing.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a control method and a control device of a low-ripple switching power supply.
Background
The current ripple of the plasma spraying power supply has great influence on the quality of the coating, and the output current ripple of the conventional silicon controlled power supply and the inverter power supply is large, so that the requirement of fine spraying processing cannot be met. The plasma spraying process requires that the output power of the power supply is generally more than 80 kW. For the power supply with high power and low-voltage and high-current output characteristics, a scheme that a plurality of power supply modules are directly connected in parallel is often used, although the scheme can meet the requirement of high power, the current ripple is correspondingly increased, and the current among the power supply modules is difficult to balance. Therefore, the plasma spraying power supply has a problem that the current ripple of the output current is large.
Disclosure of Invention
The invention provides a control method and a control device of a low-ripple switching power supply, which can reduce the current ripple of output current in a plasma spraying power supply and improve the fineness degree of plasma spraying processing.
In a first aspect, the invention provides a control method of a low-ripple switching power supply, where the switching power supply includes N Buck circuits connected in parallel, each Buck circuit includes a switch group formed by M switching tubes connected in parallel, a diode group formed by M diodes connected in parallel, and an energy storage inductor, where M and N are integers greater than or equal to 2; the method comprises the following steps: determining the phase of a target switch tube, wherein the target switch tube is any one of N multiplied by M switch tubes; determining 360 DEG/N as a first phase difference, determining 360 DEG/N/M as a second phase difference, wherein the first phase difference is the phase difference between two Buck circuits with adjacent phases, and the second phase difference is the phase difference between two switching tubes with adjacent phases in each Buck circuit; determining the phases of N multiplied by M switching tubes in the switching power supply based on the phase of the target switching tube, the first phase difference and the second phase difference; and generating driving signals of the N multiplied by M switching tubes based on the phases of the N multiplied by M switching tubes in the switching power supply.
The invention provides a control method of a low-ripple switching power supply, which is characterized in that M switching tubes are connected in parallel in each Buck circuit while N Buck circuits are connected in parallel, and the phases of the M switching tubes are arranged in a staggered mode through a control circuit, namely, the phase difference between two adjacent switching tubes is set to be 360 DEG/N/M, so that the staggered parallel arrangement of the whole switching power supply is realized. Therefore, the output current of the whole switching power supply is increased through the N multiplied by M switching tubes, the number of the switching tubes is increased, the switching frequency of the switching tubes in the switching power supply is improved, the high current of the switching power supply is met, and the current ripple of the output current is reduced. It should be understood that the fluctuation of the output current of the switching power supply is directly related to the fineness of the plasma spraying process, and the current ripple of the output current of the switching power supply is reduced, so that the fineness of the plasma spraying process can be improved.
In one possible implementation manner, determining the phases of the N × M switching tubes in the switching power supply according to the phase of the target switching tube, the first phase difference, and the second phase difference includes: determining the phase of a target switching tube as the phase of a first Buck circuit where the target switching tube is located; determining the phases of the Buck circuits except the first Buck circuit in the N Buck circuits based on the phase of the first Buck circuit and the first phase difference; and determining the phases of the N multiplied by M switching tubes in the switching power supply based on the phase and the second phase difference of each Buck circuit in the N Buck circuits.
In one possible implementation, generating the driving signals of the N × M switching tubes based on phases of the N × M switching tubes in the switching power supply includes: acquiring the total current of the N Buck circuits, the current of each Buck circuit and the total current target value of the N Buck circuits; performing PI calculation based on the total current and the total current target value, and determining the current target value of each Buck circuit; performing PI calculation based on the current of each Buck circuit and the current target value of each Buck circuit, and determining the duty ratio of each Buck circuit; and generating duty ratio signals of the N multiplied by M switching tubes based on the phases of the N multiplied by M switching tubes in the switching power supply and the duty ratio of each Buck circuit.
In one possible implementation manner, the performing PI calculation based on the total current and the total current target value to determine the current target value of each Buck circuit includes: determining a total current error based on the total current and the total current target value; inputting the total current error into a pre-trained neural network model, and correcting PI parameters in the neural network model to obtain a corrected neural network model; and performing PI calculation based on the total current error and the corrected neural network model to obtain a current target value of each Buck circuit.
In a second aspect, the invention provides a control device for a low-ripple switching power supply, where the switching power supply includes N Buck circuits connected in parallel, each Buck circuit includes a switch group formed by M switching tubes connected in parallel, a diode group formed by M diodes connected in parallel, and an energy storage inductor, where M and N are integers greater than or equal to 2; the control device includes: a communication module and a processing module; the communication module is used for acquiring the phase of a target switch tube, and the target switch tube is any one of N multiplied by M switch tubes; the processing module is used for determining 360 DEG/N as a first phase difference, determining 360 DEG/N/M as a second phase difference, wherein the first phase difference is the phase difference between two adjacent Buck circuits, and the second phase difference is the phase difference between two adjacent switching tubes in the phase of each Buck circuit; determining the phases of N multiplied by M switching tubes in the switching power supply according to the phase of the target switching tube, the first phase difference and the second phase difference; and generating driving signals of the N multiplied by M switching tubes based on the phases of the N multiplied by M switching tubes in the switching power supply.
In a possible implementation manner, the processing module is specifically configured to determine a phase of the target switch tube as a phase of a first Buck circuit in which the target switch tube is located; determining the phases of the Buck circuits except the first Buck circuit in the N Buck circuits based on the phase of the first Buck circuit and the first phase difference; and determining the phases of the N multiplied by M switching tubes in the switching power supply based on the phase and the second phase difference of each Buck circuit in the N Buck circuits.
In a possible implementation manner, the communication module is further configured to obtain a total current of the N Buck circuits, a current of each Buck circuit, and a total current target value of the N Buck circuits; the processing module is specifically used for performing PI calculation based on the total current and the total current target value and determining the current target value of each Buck circuit; performing PI calculation based on the current of each Buck circuit and the current target value of each Buck circuit, and determining the duty ratio of each Buck circuit; and generating duty ratio signals of the N multiplied by M switching tubes based on the phases of the N multiplied by M switching tubes in the switching power supply and the duty ratio of each Buck circuit.
In one possible implementation, the processing module is specifically configured to determine a total current error based on the total current and a total current target value; inputting the total current error into a pre-trained neural network model, and correcting PI parameters in the neural network model to obtain a corrected neural network model; and performing PI calculation based on the total current error and the corrected neural network model to obtain a current target value of each Buck circuit.
In a third aspect, the invention further provides a low-ripple switching power supply, where the switching power supply includes N Buck circuits connected in parallel, each Buck circuit includes a switch group formed by M parallel switches, a diode group formed by M parallel diodes, and an energy storage inductor, where M and N are integers greater than or equal to 2; the phase difference between two Buck circuits adjacent in phase is 360 degrees/N, and the phase difference between two switching tubes adjacent in phase in each Buck circuit is 360 degrees/N/M.
In a fourth aspect, the present invention further provides a control apparatus, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method according to the first aspect or any one of the possible implementations of the first aspect when executing the computer program.
In a fifth aspect, the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, performs the steps of the method according to the first aspect or any one of the possible implementations of the first aspect.
For technical effects brought by any one implementation manner of the second aspect to the fifth aspect, reference may be made to the technical effects brought by the first aspect or the implementation manner corresponding to the first aspect, and details are not described here again.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a low-ripple switching power supply according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a control method of a low-ripple switching power supply according to an embodiment of the present invention;
fig. 3 is a schematic phase diagram of a switching tube in a low-ripple switching power supply according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a control loop of a low-ripple switching power supply according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an output current of a low-ripple switching power supply according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a control device of a low-ripple switching power supply according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another control device for a low-ripple switching power supply according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In the description of the present invention, "/" means "or" unless otherwise specified, for example, a/B may mean a or B. "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. Further, "at least one" or "a plurality" means two or more. The terms "first", "second", and the like do not necessarily limit the number and execution order, and the terms "first", "second", and the like do not necessarily limit the difference.
In the embodiments of the present application, words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present relevant concepts in a concrete fashion for ease of understanding.
Furthermore, the terms "including" and "having," and any variations thereof, as referred to in the description of the present application, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to the listed steps or modules, but may alternatively include other steps or modules not listed or inherent to such process, method, article, or apparatus.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made by way of specific embodiments with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a low-ripple switching power supply according to an embodiment of the present invention. The switching power supply comprises N Buck circuits connected in parallel, each Buck circuit comprises a switch tube group formed by M switch tubes connected in parallel, a diode group formed by M diodes connected in parallel and an energy storage inductor, and M and N are integers larger than or equal to 2.
For each Buck circuit, the drain electrode of the switch tube group is connected with the positive electrode of the input end of the switch power supply, the source electrode of the switch tube group is connected with the cathode of the diode group and the first end of the energy storage inductor, the anode of the diode group is connected with the cathode of the input end and the cathode of the output end of the staggered parallel switch power supply, and the second end of the energy storage inductor is connected with the positive electrode of the input end of the switch power supply.
Illustratively, as shown in fig. 1, N and M have a value of 4, the switching power supply includes 4 Buck circuits connected in parallel, each Buck circuit includes a switch group formed by 4 switching tubes connected in parallel, a diode group formed by 4 diodes connected in parallel, and an energy storage inductor.
Based on the low-ripple switching power supply shown in fig. 1, as shown in fig. 2, an embodiment of the present invention provides a control method of a low-ripple switching power supply, where an execution subject of the method is a control device of a switching power supply, and the method includes steps S201 to S204.
S201, the control device determines the phase of a target switch tube.
The target switch tube is any one of N multiplied by M switch tubes.
For example, the target switch tube may be a switch tube in the first Buck circuit, for example, the first switch tube T11, or the first switch tube T12. Alternatively, the target switch tube may also be a switch tube in the second Buck circuit, for example, the second switch tube T22, or the second switch tube T23.
S202, the control device determines 360 DEG/N as a first phase difference and 360 DEG/N/M as a second phase difference.
The first phase difference is the phase difference between two Buck circuits with adjacent phases, and the second phase difference is the phase difference between two switching tubes with adjacent phases in each Buck circuit.
For example, assuming that N and M both take on values of 4, the first phase difference is 90 °, and the second phase difference is 22.5 °.
S203, the control device determines the phases of the N multiplied by M switching tubes in the switching power supply based on the phase of the target switching tube, the first phase difference and the second phase difference.
And S204, the control device generates driving signals of the N multiplied by M switching tubes based on the phases of the N multiplied by M switching tubes in the switching power supply.
The invention provides a control method of a low-ripple switching power supply, which is characterized in that M switching tubes are connected in parallel in each Buck circuit while N Buck circuits are connected in parallel, and the phases of the M switching tubes are arranged in a staggered mode through a control circuit, namely, the phase difference between two adjacent switching tubes is set to be 360 DEG/N/M, so that the staggered parallel arrangement of the whole switching power supply is realized. Therefore, the output current of the whole switching power supply is increased through the N multiplied by M switching tubes, the number of the switching tubes is increased, the switching frequency of the switching tubes in the switching power supply is improved, the high current of the switching power supply is met, the current ripple of the output current is reduced, and the fineness of plasma spraying processing is improved.
Optionally, step S203 may be implemented as steps S301 to S303.
S301, the control device determines the phase of the target switching tube as the phase of the first Buck circuit where the target switching tube is located.
For example, assuming that the target switch tube is the first switch tube T11 and the phase is 0, the phase of the first Buck circuit is 0.
S302, the control device determines the phases of the Buck circuits except the first Buck circuit in the N Buck circuits based on the phase of the first Buck circuit and the first phase difference.
Illustratively, assuming that the phase of the first Buck circuit is 0 and the first phase difference is 90 °, the phase of the second Buck circuit is 90 °, the phase of the third Buck circuit is 180 °, and the phase of the fourth Buck circuit is 270 °.
And S303, the control device determines the phases of the N multiplied by M switching tubes in the switching power supply based on the phase and the second phase difference of each Buck circuit in the N Buck circuits.
Illustratively, assuming that the phase of the second Buck circuit is 90 °, the phases of the four switching tubes in the second Buck circuit are 90 °, 112.5 °, 135 °, and 157.5 °, respectively.
For example, assuming that N and M both take on values of 4, the first phase difference is 90 °, the second phase difference is 22.5 °, and the phases of N × M switching tubes are shown in table 1.
TABLE 1
| First Buck circuit | T11 | T12 | T13 | T14 |
| Phase position | 0° | 22.5° | 45° | 67.5° |
| Second Buck circuit | T21 | T22 | T23 | T24 |
| Phase position | 90° | 112.5° | 135° | 157.5° |
| Third Buck circuit | T31 | T32 | T33 | T34 |
| Phase position | 180° | 202.5° | 225° | 247.5° |
| Fourth Buck circuit | T41 | T42 | T43 | T44 |
| Phase position | 270° | 292.5° | 315° | 337.5° |
As shown in fig. 3, an embodiment of the invention provides a phase diagram of a switching tube in a low-ripple switching power supply. The phase of the first switch tube T11 is 22.5 ° different from the phase of the first second switch tube. The phase of the first switch tube T11 is different from the phase of the second switch tube by 90 °.
It should be noted that the phase of the switching tube may be generated based on the FPGA circuit. Illustratively, the FPGA circuit includes a counter and a number of registers equal to the number of switching tubes. The counter counts based on the phase of the target switch tube, and sends phase angle data to the corresponding register of the switch tube every 22.5 degrees. Therefore, the phase angle data of each of the switching tubes is stored in the corresponding register.
Optionally, step S204 may be implemented as steps S401 to S304.
S401, the control device obtains the total current of the N Buck circuits, the current of each Buck circuit and the total current target value of the N Buck circuits.
As a possible implementation, in the main circuit and each Buck circuit, a hall current sensor is provided. The control device can acquire the total current of the switching power supply and the current of each Buck circuit through the Hall current sensor.
S402, the control device performs PI calculation based on the total current and the total current target value, and determines the current target value of each Buck circuit.
As a possible implementation, the control device may determine the total current error based on the total current, the total current target value; inputting the total current error into a pre-trained neural network model, and correcting PI parameters in the neural network model to obtain a corrected neural network model; and performing PI calculation based on the total current error and the corrected neural network model to obtain a current target value of each Buck circuit.
And S403, the control device performs PI calculation based on the current of each Buck circuit and the current target value of each Buck circuit, and determines the duty ratio of each Buck circuit.
And S404, the control device generates duty ratio signals of the N multiplied by M switching tubes based on the phases of the N multiplied by M switching tubes in the switching power supply and the duty ratio of each Buck circuit.
As shown in fig. 4, an embodiment of the present invention provides a schematic diagram of a control loop of a low-ripple switching power supply, where the switching power supply adopts double closed-loop control, an outer loop adopts neural network model control, and PI calculation is performed based on a total current of the switching power supply and a target value of the total current to obtain a current target value of each Buck circuit. The inner loop adopts a PI control algorithm, PI calculation is carried out based on the current of each Buck circuit and the current target value of each Buck circuit, the duty ratio of each Buck circuit is determined, and duty ratio signals of N multiplied by M switching tubes are generated based on the phases of the N multiplied by M switching tubes and the duty ratio of each Buck circuit, so that the control of the N multiplied by M switching tubes in the main circuit is realized.
Therefore, the embodiment of the invention can correct the PI parameter in the neural network model based on the total current of the main circuit, so that the calculated current target value of each Buck circuit is adapted to the actual operation condition of the main circuit, and the precision degree of the switch power supply control is improved.
As shown in fig. 5, an embodiment of the present invention provides a schematic diagram of an output current of a low-ripple switching power supply. Curve a is a schematic output current diagram when the values of N and M are both 1. Curve B is the output current diagram when both the values of N and M are 4. By contrast, the current ripple of curve a is much larger than that of curve B.
Therefore, 4 Buck circuits are connected in parallel, and 4 switching tubes are connected in parallel in each Buck circuit, so that the switching frequency of the switching tubes in the switching power supply is improved, the switching frequency of the switching tubes in the switching power supply is increased, the current ripple of the output current is reduced while the large current of the switching power supply is met, and the fineness of plasma spraying processing is improved.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The following are embodiments of the apparatus of the invention, reference being made to the corresponding method embodiments described above for details which are not described in detail therein.
Fig. 6 shows a schematic structural diagram of a control device of a low-ripple switching power supply according to an embodiment of the present invention, where the switching power supply includes N Buck circuits connected in parallel, each Buck circuit includes a switch group formed by M switching tubes connected in parallel, a diode group formed by M diodes connected in parallel, and an energy storage inductor, where M and N are integers greater than or equal to 2. The control device 600 includes: a communication module 601 and a processing module 602.
The communication module 601 is configured to acquire a phase of a target switch tube.
The processing module 602 is configured to determine 360 °/N as a first phase difference, determine 360 °/N/M as a second phase difference, where the first phase difference is a phase difference between two adjacent Buck circuits, and the second phase difference is a phase difference between two switching tubes in each Buck circuit, where the phases of the two switching tubes are adjacent to each other; determining the phases of N multiplied by M switching tubes in the switching power supply according to the phase of the target switching tube, the first phase difference and the second phase difference; and generating driving signals of the N multiplied by M switching tubes based on the phases of the N multiplied by M switching tubes in the switching power supply.
In a possible implementation manner, the processing module 602 is specifically configured to determine a phase of the target switch tube as a phase of a first Buck circuit in which the target switch tube is located; determining the phases of the Buck circuits except the first Buck circuit in the N Buck circuits based on the phase of the first Buck circuit and the first phase difference; and determining the phases of the N multiplied by M switching tubes in the switching power supply based on the phase and the second phase difference of each Buck circuit in the N Buck circuits.
In a possible implementation manner, the communication module 601 is further configured to obtain a total current of the N Buck circuits, a current of each Buck circuit, and a total current target value of the N Buck circuits; the processing module 602 is specifically configured to perform PI calculation based on the total current and the total current target value, and determine a current target value of each Buck circuit; performing PI calculation based on the current of each Buck circuit and the current target value of each Buck circuit, and determining the duty ratio of each Buck circuit; and generating duty ratio signals of the N multiplied by M switching tubes based on the phases of the N multiplied by M switching tubes in the switching power supply and the duty ratio of each Buck circuit.
In one possible implementation, the processing module 602 is specifically configured to determine a total current error based on the total current and a total current target value; inputting the total current error into a pre-trained neural network model, and correcting PI parameters in the neural network model to obtain a corrected neural network model; and performing PI calculation based on the total current error and the corrected neural network model to obtain a current target value of each Buck circuit.
Fig. 7 is a schematic structural diagram of another control device for a low-ripple switching power supply according to an embodiment of the present invention. As shown in fig. 7, the control device 600 of this embodiment includes: a processor 701, a memory 702, and a computer program 703 stored in said memory 702 and executable on said processor 701. The processor 701 implements the steps in the above method embodiments, such as the steps 201 to 204 shown in fig. 2, when executing the computer program 703. Alternatively, the processor 701, when executing the computer program 703, implements the functions of each module/unit in each device embodiment described above, for example, the functions of the communication module 601 and the processing module 602 shown in fig. 6.
Illustratively, the computer program 703 may be partitioned into one or more modules/units that are stored in the memory 702 and executed by the processor 701 to implement the present invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program 703 in the control apparatus 600. For example, the computer program 703 may be divided into the communication module 601 and the processing module 602 shown in fig. 6. The Processor 701 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 702 may be an internal storage unit of the control device 600, such as a hard disk or a memory of the control device 600. The memory 702 may also be an external storage device of the control apparatus 600, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, provided on the control apparatus 600. Further, the memory 702 may also include both an internal storage unit and an external storage device of the control apparatus 600. The memory 702 is used for storing the computer program and other programs and data required by the terminal. The memory 702 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The embodiment of the invention also provides a low-ripple switching power supply, which comprises N Buck Buck circuits connected in parallel, wherein each Buck circuit comprises a switch tube group consisting of M switch tubes connected in parallel, a diode group consisting of M diodes connected in parallel and an energy storage inductor, and M and N are integers greater than or equal to 2; the phase difference between two Buck circuits adjacent in phase is 360 degrees/N, and the phase difference between two switching tubes adjacent in phase in each Buck circuit is 360 degrees/N/M.
Therefore, the switching power supplies are arranged in a staggered and parallel mode, the switching frequency of the switching tube in the switching power supply is improved, the requirement of high current of the switching power supply is met, the current ripple of output current is reduced, and the fineness degree of plasma spraying processing is improved.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other ways. For example, the above-described apparatus/terminal embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media which may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; 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; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. The control method of the low-ripple switching power supply is characterized in that the switching power supply comprises N Buck circuits connected in parallel, each Buck circuit comprises a switch tube group formed by M switch tubes connected in parallel, a diode group formed by M diodes connected in parallel and an energy storage inductor, and M and N are integers more than or equal to 2; the method comprises the following steps:
determining the phase of a target switch tube, wherein the target switch tube is any one of N multiplied by M switch tubes;
determining 360 DEG/N as a first phase difference, and determining 360 DEG/N/M as a second phase difference, wherein the first phase difference is the phase difference between two Buck circuits with adjacent phases, and the second phase difference is the phase difference between two switching tubes with adjacent phases in each Buck circuit;
determining the phases of N multiplied by M switching tubes in the switching power supply based on the phase of the target switching tube, the first phase difference and the second phase difference;
and generating driving signals of the N multiplied by M switching tubes based on the phases of the N multiplied by M switching tubes in the switching power supply.
2. The control method according to claim 1, wherein the determining the phases of the N × M switching tubes in the switching power supply according to the phase of the target switching tube, the first phase difference, and the second phase difference comprises:
determining the phase of the target switching tube as the phase of a first Buck circuit where the target switching tube is located;
determining the phases of the Buck circuits except the first Buck circuit in the N Buck circuits based on the phase of the first Buck circuit and the first phase difference;
and determining the phases of N multiplied by M switching tubes in the switching power supply based on the phase of each Buck circuit in the N Buck circuits and the second phase difference.
3. The control method according to claim 1, wherein the generating the driving signals of the nxm switching tubes based on the phases of the nxm switching tubes in the switching power supply comprises:
acquiring the total current of the N Buck circuits, the current of each Buck circuit and the total current target value of the N Buck circuits;
performing PI calculation based on the total current and the total current target value, and determining the current target value of each Buck circuit;
performing PI calculation based on the current of each Buck circuit and the current target value of each Buck circuit, and determining the duty ratio of each Buck circuit;
and generating duty ratio signals of the N multiplied by M switching tubes based on the phases of the N multiplied by M switching tubes in the switching power supply and the duty ratio of each Buck circuit.
4. The control method according to claim 3, wherein the performing PI calculation based on the total current and the total current target value to determine the current target value of each Buck circuit comprises:
determining a total current error based on the total current, the total current target value;
inputting the total current error into a pre-trained neural network model, and correcting a PI parameter in the neural network model to obtain a corrected neural network model;
and performing PI calculation based on the total current error and the corrected neural network model to obtain a current target value of each Buck circuit.
5. The control device of the low-ripple switching power supply is characterized in that the switching power supply comprises N Buck circuits connected in parallel, each Buck circuit comprises a switch tube group formed by M switch tubes connected in parallel, a diode group formed by M diodes connected in parallel and an energy storage inductor, and M and N are integers more than or equal to 2; the control device includes: a communication module and a processing module;
the communication module is used for acquiring the phase of a target switch tube, and the target switch tube is any one of N multiplied by M switch tubes;
the processing module is used for determining 360 DEG/N as a first phase difference, and determining 360 DEG/N/M as a second phase difference, wherein the first phase difference is the phase difference between two adjacent Buck circuits, and the second phase difference is the phase difference between two adjacent switching tubes in the phase of each Buck circuit; determining the phases of N multiplied by M switching tubes in the switching power supply according to the phase of the target switching tube, the first phase difference and the second phase difference; and generating driving signals of the N multiplied by M switching tubes based on the phases of the N multiplied by M switching tubes in the switching power supply.
6. The control device according to claim 5,
the processing module is specifically configured to determine a phase of the target switching tube as a phase of a first Buck circuit in which the target switching tube is located; determining the phases of the Buck circuits except the first Buck circuit in the N Buck circuits based on the phase of the first Buck circuit and the first phase difference; and determining the phases of N multiplied by M switching tubes in the switching power supply based on the phase of each Buck circuit in the N Buck circuits and the second phase difference.
7. The control device according to claim 5,
the communication module is further used for acquiring the total current of the N Buck circuits, the current of each Buck circuit and the total current target value of the N Buck circuits;
the processing module is specifically configured to perform PI calculation based on the total current and the total current target value, and determine a current target value of each Buck circuit; performing PI calculation based on the current of each Buck circuit and the current target value of each Buck circuit, and determining the duty ratio of each Buck circuit; and generating duty ratio signals of the N multiplied by M switching tubes based on the phases of the N multiplied by M switching tubes in the switching power supply and the duty ratio of each Buck circuit.
8. A low ripple switching power supply is characterized in that the switching power supply comprises N Buck Buck circuits connected in parallel, each Buck circuit comprises a switch tube group formed by M switch tubes connected in parallel, a diode group formed by M diodes connected in parallel and an energy storage inductor, and M and N are integers greater than or equal to 2; the phase difference between two Buck circuits adjacent in phase is 360 degrees/N, and the phase difference between two switching tubes adjacent in phase in each Buck circuit is 360 degrees/N/M.
9. A control apparatus, characterized in that the control apparatus comprises a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor, when executing the computer program, implements the steps of the method according to any of the preceding claims 1 to 4.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 4.
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