CN118017849A - Soft start and light load control method for double-active-bridge series resonant converter - Google Patents
Soft start and light load control method for double-active-bridge series resonant converter Download PDFInfo
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- CN118017849A CN118017849A CN202410417540.3A CN202410417540A CN118017849A CN 118017849 A CN118017849 A CN 118017849A CN 202410417540 A CN202410417540 A CN 202410417540A CN 118017849 A CN118017849 A CN 118017849A
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Classifications
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33573—Full-bridge at primary side of an isolation transformer
-
- 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
- H02M1/36—Means for starting or stopping converters
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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
- H02M3/01—Resonant DC/DC converters
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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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a soft start and light load control method of a double-active-bridge series resonant converter, electronic equipment and a storage medium, wherein the method comprises the following steps: determining an average output current of the dual-active bridge series resonant converter according to the phase shifting characteristic and the resonance characteristic of the dual-active bridge series resonant converter; acquiring expected output current and maximum switching frequency of the double-active-bridge series resonant converter; determining phase control parameters for the dual active bridge series resonant converter based on the desired output current, the maximum switching frequency, and the average output current; and generating soft start and light load control strategies of the double-active-bridge series resonant converter according to the phase control parameters. According to the invention, the control is performed without adopting a mode of adjusting the duty ratio under the fixed switching frequency, and the soft start and light load control strategy can be generated by utilizing the phase control parameters on the premise of not increasing the control complexity, so that the soft start and light load control effect of the double-active-bridge series resonant converter is optimized.
Description
Technical Field
The invention relates to the technical field of power system control, in particular to a soft start and light load control method of a double-active-bridge series resonant converter, electronic equipment and a computer readable storage medium.
Background
With the continuous development of the power electronics industry, a dual active bridge series resonant converter (DAB-SRC) is increasingly widely used. The DAB-SRC can realize better control effects in the aspects of soft switching, gain and the like under heavier load, but the impedance of a resonant cavity required under soft starting and light load is extremely high and is limited by the control precision of a chip and the characteristics of a switching tube, the current common control mode is to adjust the duty ratio to reduce the gain under fixed switching frequency, but the control complexity is further improved by adjusting the duty ratio in the DAB-SRC, and the control effect is weakened.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the invention provides a soft start and light load control method of a double-active-bridge series resonant converter, electronic equipment and a computer readable storage medium, which can optimize the soft start and light load control effect of DAB-SRC on the premise of not increasing the control complexity.
In a first aspect, an embodiment of the present invention provides a soft start and light load control method for a dual active bridge series resonant converter, including:
determining an average output current of the dual-active bridge series resonant converter according to the phase shifting characteristic and the resonance characteristic of the dual-active bridge series resonant converter;
Acquiring an expected output current and a maximum switching frequency of the dual active bridge series resonant converter;
determining a phase control parameter for the dual active bridge series resonant converter based on the desired output current, the maximum switching frequency, and the average output current;
And generating soft start and light load control strategies of the double-active-bridge series resonant converter according to the phase control parameters.
Optionally, in an embodiment of the present invention, the dual-active-bridge series resonant converter includes a primary side two-leg, a secondary side two-leg, and a resonant cavity disposed between the primary side two-leg and the secondary side two-leg; the determining the average output current of the dual-active bridge series resonant converter according to the phase shifting characteristic and the resonance characteristic of the dual-active bridge series resonant converter comprises the following steps:
The method comprises the steps of obtaining fundamental waves of first voltage and fundamental waves of second voltage of the double-active-bridge series resonant converter, wherein the first voltage is first square wave voltage after phase shifting between two bridge arms of a primary side, the second voltage is second square wave voltage after phase shifting between two bridge arms of a secondary side, the amplitude of the first square wave voltage is equal to the amplitude of primary side input voltage, and the amplitude of the second square wave voltage is equal to the product of the amplitude of secondary side output voltage and the transformer ratio of the double-active-bridge series resonant converter;
Calculating the impedance of the resonant cavity;
And determining the average output current of the dual-active-bridge series resonant converter according to the fundamental wave of the first voltage, the fundamental wave of the second voltage and the impedance of the resonant cavity.
Optionally, in one embodiment of the present invention, the resonant cavity includes a resonant inductance and a resonant capacitance; the calculation formula of the average output current is as follows:
；
，，；
Wherein, For the said average output current it is,For the phase shift angle of the first square wave voltage,For the phase shift angle of the second square wave voltage,Is the phase shift angle between the two bridge arms of the primary side and the two bridge arms of the secondary side,For the transformer ratio of the dual active bridge series resonant converter,For the magnitude of the first square-wave voltage,For the impedance of the resonant cavity,For the inductive reactance of the resonant inductance,As the capacitive reactance of the resonant capacitor,For the switching frequency of the dual active bridge series resonant converter.
Optionally, in one embodiment of the present invention, the determining the phase control parameter for the dual active bridge series resonant converter according to the desired output current, the maximum switching frequency, and the average output current includes:
And substituting the expected output current and the maximum switching frequency into the calculation type of the average output current by taking the expected output current as the average output current of the double-active-bridge series resonant converter and taking the maximum switching frequency as the switching frequency of the double-active-bridge series resonant converter, and calculating to obtain the phase control parameter of the double-active-bridge series resonant converter.
Optionally, in one embodiment of the present invention, the generating a soft start and light load control strategy of the dual active bridge series resonant converter according to the phase control parameter includes:
when the phase control parameter is Controlling the phase shift angle of the second square wave voltagePhase shift angle between two bridge arms of primary side and two bridge arms of secondary sideUnchanged, adjustTo achieve adjustmentBy adjustingSoft start and light load control are carried out on the double active bridge series resonant converter;
Wherein, For a desired output current of the dual active bridge series resonant converter,，，Is the maximum switching frequency of the dual active bridge series resonant converter.
Optionally, in one embodiment of the present invention, the generating a soft start and light load control strategy of the dual active bridge series resonant converter according to the phase control parameter includes:
when the phase control parameter is Controlling the phase shift angle of the first square wave voltagePhase shift angle between two bridge arms of primary side and two bridge arms of secondary sideUnchanged, adjustTo achieve adjustmentBy adjustingSoft start and light load control are carried out on the double active bridge series resonant converter;
Wherein, For a desired output current of the dual active bridge series resonant converter,，，Is the maximum switching frequency of the dual active bridge series resonant converter.
Optionally, in one embodiment of the present invention, the generating a soft start and light load control strategy of the dual active bridge series resonant converter according to the phase control parameter includes:
when the phase control parameter is Controlling the phase shift angle of the first square wave voltagePhase shift angle of the second square wave voltageUnchanged, adjustTo achieve adjustmentBy adjustingSoft start and light load control are carried out on the double active bridge series resonant converter;
Wherein, For a desired output current of the dual active bridge series resonant converter,，， Is the maximum switching frequency of the dual active bridge series resonant converter.
In a second aspect, an embodiment of the present invention provides an electronic device, including:
At least one processor;
At least one memory for storing at least one program;
the soft start and light load control method of the dual active bridge series resonant converter of the first aspect is implemented when at least one of the programs is executed by at least one of the processors.
In a third aspect, an embodiment of the present invention provides a computer readable storage medium, in which a program executable by a processor is stored, where the program executable by the processor is used to implement the soft start and light load control method of the dual active bridge series resonant converter according to the first aspect.
The soft start and light load control method, the electronic equipment and the computer readable storage medium of the double-active-bridge series resonant converter provided by the invention can clearly calculate the phase control parameters of the double-active-bridge series resonant converter by acquiring the expected output current and the limited maximum switching frequency of the double-active-bridge series resonant converter under the actual condition and combining the average output current of the double-active-bridge series resonant converter, and further generate the soft start and light load control strategy of the double-active-bridge series resonant converter by utilizing the phase control parameters.
Drawings
FIG. 1 is a flow chart of a soft start and light load control method for a dual active bridge series resonant converter according to an embodiment of the present invention;
FIG. 2 is a schematic circuit topology of a dual active bridge series resonant converter according to one embodiment of the present invention;
fig. 3 is a flowchart of step S1000 in fig. 1;
FIG. 4 is a schematic diagram of waveforms of a first square wave voltage and a second square wave voltage according to an embodiment of the present invention;
FIG. 5 (a) is a graph of one of the phase control parameters versus the desired output current provided by an embodiment of the present invention;
FIG. 5 (b) is a graph of one of the phase control parameters versus the desired output current provided by another embodiment of the present invention;
FIG. 5 (c) is a graph of one of the phase control parameters versus the desired output current provided by another embodiment of the present invention;
FIG. 6 (a) is a control block diagram of a high side bus loop provided by an embodiment of the present invention;
FIG. 6 (b) is a control block diagram of a low side battery voltage loop provided by an embodiment of the present invention;
FIG. 7 is a schematic diagram of the soft-onset effect of high side voltage provided by an embodiment of the present invention;
FIG. 8 is a schematic diagram of the soft-effect of the low side voltage provided by an embodiment of the present invention;
Fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It should be noted that although functional block division is performed in a device diagram and a logic sequence is shown in a flowchart, in some cases, the steps shown or described may be performed in a different order than the block division in the device, or in the flowchart.
The invention provides a soft start and light load control method of a double-active-bridge series resonant converter, electronic equipment and a computer readable storage medium, wherein the soft start and light load control method of the double-active-bridge series resonant converter comprises the following steps: determining an average output current of the dual-active bridge series resonant converter according to the phase shifting characteristic and the resonance characteristic of the dual-active bridge series resonant converter; acquiring expected output current and maximum switching frequency of the double-active-bridge series resonant converter; determining phase control parameters for the dual active bridge series resonant converter based on the desired output current, the maximum switching frequency, and the average output current; and generating soft start and light load control strategies of the double-active-bridge series resonant converter according to the phase control parameters. According to the invention, the phase control parameters of the double-active-bridge series resonant converter can be definitely calculated by acquiring the expected output current and the limited maximum switching frequency of the double-active-bridge series resonant converter under the actual condition and combining the average output current of the double-active-bridge series resonant converter, and then the soft start and light load control strategies of the double-active-bridge series resonant converter are generated by utilizing the phase control parameters.
Fig. 1 is a flowchart of a soft start and light load control method of a dual active bridge series resonant converter according to an embodiment of the present invention. As shown in fig. 1, the soft start and light load control method of the dual active bridge series resonant converter may include, but is not limited to, steps S1000 to S4000, wherein the process of establishing the voltage from zero to the target value is called soft start, and the light load corresponds to the heavy load, which means that the dual active bridge series resonant converter is in a condition of no load or less load after the soft start is completed.
Step S1000: determining an average output current of the dual-active bridge series resonant converter according to the phase shifting characteristic and the resonance characteristic of the dual-active bridge series resonant converter;
step S2000: acquiring expected output current and maximum switching frequency of the double-active-bridge series resonant converter;
Step S3000: determining phase control parameters for the dual active bridge series resonant converter based on the desired output current, the maximum switching frequency, and the average output current;
step S4000: and generating soft start and light load control strategies of the double-active-bridge series resonant converter according to the phase control parameters.
In this step, only the expected output current and the limited maximum switching frequency of the dual-active bridge series resonant converter under the actual condition are obtained and the average output current is combined, so that the phase control parameter of the dual-active bridge series resonant converter can be clearly calculated, and further, the soft start and light load control strategies of the dual-active bridge series resonant converter are generated by utilizing the phase control parameter.
In an embodiment, the type and specification of the dual active bridge series resonant converter may be various, and the specific topology of the dual active bridge series resonant converter is described below, and the specific topology of the dual active bridge series resonant converter is used as a principle description of the application of the soft start and light load control method of the present embodiment, but should not be construed as any limitation of the present embodiment. Fig. 2 is a schematic circuit topology diagram of a dual-active bridge series resonant converter according to an embodiment of the present invention, wherein a primary side of the converter is a high-voltage side, and a voltage is; The secondary side is low voltage side and can be connected with a battery, and the voltage is; S1, S2, S3, S4, Q1, Q2, Q3 and Q4 are MOSFET switch tubes, four D1 on the primary side and four D2 on the secondary side are diodes, CS1, CS2, CS3, CS4 and CQ1, CQ2, CQ3 and CQ4 are capacitors, cbus is a high-voltage side capacitor, cbat is a low-voltage side capacitor, transformer ratios of the converter are N, lr and Cr are resonant inductance and resonant capacitance respectively, and specifically, the double-active-bridge series resonant converter comprises primary two bridge arms, secondary two bridge arms and a resonant cavity arranged between the primary two bridge arms and the secondary two bridge arms, wherein the resonant cavity comprises the resonant inductance and the resonant capacitance.
Based on the circuit topology of the dual active bridge series resonant converter shown in fig. 2, one embodiment of the present application, as shown in fig. 3, step S1000 may include, but is not limited to, steps S1100 through S1300.
Step S1100: the method comprises the steps of obtaining fundamental waves of first voltage and fundamental waves of second voltage of the double-active-bridge series resonant converter, wherein the first voltage is first square wave voltage after phase shifting between two bridge arms of a primary side, the second voltage is second square wave voltage after phase shifting between two bridge arms of a secondary side, the amplitude of the first square wave voltage is equal to the amplitude of primary side input voltage, and the amplitude of the second square wave voltage is equal to the product of the amplitude of secondary side output voltage and the transformer ratio of the double-active-bridge series resonant converter;
step S1200: calculating the impedance of the resonant cavity;
step S1300: the average output current of the dual active bridge series resonant converter is determined based on the fundamental of the first voltage, the fundamental of the second voltage, and the impedance of the resonant cavity.
In this step, the phase shift characteristic of the dual active bridge series resonant converter is considered, that is, the fundamental wave of the first voltage and the fundamental wave of the second voltage of the dual active bridge series resonant converter are obtained, and the resonance characteristic of the dual active bridge series resonant converter is considered, that is, the impedance of the resonant cavity is calculated, so that the average output current thereof can be determined from the fundamental wave of the first voltage, the fundamental wave of the second voltage and the impedance of the resonant cavity.
In particular, the method comprises the steps of,Is of amplitude magnitudeIs phase-shifted between the two legs of the primary sideAfter that, the processing unit is configured to,As shown in fig. 4, the fundamental wave of the voltage is:
；
Is provided with The primary side voltage phase is used as a reference, and the primary side phase difference and the secondary side phase difference areI.e. the phase shift angle between the two legs of the primary side and the two legs of the secondary side is。
Is of amplitude magnitudeWhen the second square wave voltage of the secondary side is shifted between the two bridge armsAfter that, the processing unit is configured to,As shown in fig. 4, the fundamental wave of the voltage is:
。
The impedance of the resonant cavity consisting of Lr and Cr is:
；
Wherein, ，，，For the impedance of the resonant cavity,Is the inductance of the resonant inductor,Is the capacitive reactance of the resonant capacitor,Switching frequency for a dual active bridge series resonant converter;
combining the voltage across the resonant cavity 、Impedance of resonant cavityThe current of the resonant cavity can be obtained:
；
Its average output current The method comprises the following steps:
。
Step S3000 may include, but is not limited to, step S3100, in one embodiment of the present application.
Step S3100: and substituting the expected output current and the maximum switching frequency into the calculation type of the average output current, and calculating to obtain the phase control parameter of the double-active-bridge series resonant converter.
In this step, since the impedance of the resonant cavity required by soft start and light load is theoretically equivalent to infinity, the switching frequency is adjusted to be maximum, that is, the maximum switching frequency is taken as the switching frequency of the dual-active bridge series resonant converter, and the expected output current is taken as the average output current of the dual-active bridge series resonant converter, and the calculation formula of the average output current is known, so that the phase control parameter of the dual-active bridge series resonant converter can be accurately and reliably calculated by substituting the calculation method.
In one embodiment of the present application, step S4000 may include, but is not limited to, step S4100.
Step S4100: when the phase control parameter isControl ofAndUnchanged, adjustTo achieve adjustmentBy adjustingSoft start and light load control are carried out on the double active bridge series resonant converter;
Wherein, For a desired output current of a dual active bridge series resonant converter,，，Is the maximum switching frequency of the dual active bridge series resonant converter.
It can be seen thatIs fixed asControl ofAndUnchanged by adjustingCan be adjustedAt this timeI.e. phase shift angle equivalent to the first square wave voltageThereby by adjustingRealizing the control of soft start and light load of the double active bridge series resonant converter as shown in fig. 5 (a)As the load increases fromGradually lowering until reaching heavy load, at this timeMaintained at a stable value A, A being 0 or 0 toArbitrary values in between.
It will be appreciated that the manner in which the desired output current of the dual active bridge series resonant converter is obtained may be varied, and is not limited herein, for example, when power flows from a high voltage side to a low voltage side,Is positive; when power flows from the low pressure side to the high pressure side,Negative, when no loadIs a value close to zero. When the low side voltage is fixed and the high side is soft from zero, it can be calculated using, but not limited to, the high side bus loopAs shown in fig. 6 (a),For the high-side voltage control target value,For the high-side voltage sample, G1 is a controller adapted under the loop, such as, but not limited to, a PI controller, corresponding to that stateAs shown in fig. 7, the horizontal axis of fig. 7 represents time, the vertical axis represents voltage value, it can be seen that,Soft starting is carried out along with the time, the voltage gradually increases gradually, and finally, the voltage approaches to a balance value; when the high-side voltage is fixed and the low-side is soft starting from zero, the low-side battery voltage loop is used for calculatingAs shown in fig. 6 (b),Is the low-voltage side voltage control target value,For the low-side voltage sample, G2 is a controller adapted under the loop, such as, but not limited to, a PI controller, corresponding to that stateAs shown in fig. 8, the horizontal axis of fig. 8 represents time, the vertical axis represents voltage value, it can be seen that,The soft start is carried out along with the time, the early voltage increasing effect is obvious, the later stage is gradually gentle, and finally, the balance value is tended.
In one embodiment of the present application, step S4000 may include, but is not limited to, step S4200.
Step S4200: when the phase control parameter isControl ofAndUnchanged, adjustTo achieve adjustmentBy adjustingSoft start and light load control are carried out on the double active bridge series resonant converter;
It can be seen that Is fixed asControl ofAndUnchanged by adjustingCan be adjustedAt this timeI.e. the phase shift angle can be equivalent to the second square wave voltageThereby by adjustingRealizing the control of soft start and light load of the double active bridge series resonant converter as shown in fig. 5 (b)As the load increases fromGradually lowering until reaching heavy load, at this timeMaintained at a stable value B, B being 0 or 0 toArbitrary values in between.
Step S4000 may include, but is not limited to, step S4300, in one embodiment of the present application.
Step S4300: when the phase control parameter isControl ofAndUnchanged, adjustTo achieve adjustmentBy adjustingSoft start and light load control are carried out on the double active bridge series resonant converter;
It can be seen that Is fixed asControl ofAndUnchanged by adjustingCan be adjustedAt this timeI.e. the phase shift angle between the two legs of the primary side and the two legs of the secondary sideThereby by adjustingControl of soft-start and light-load of the double-active bridge series resonant converter is realized as shown in fig. 5 (c)Gradually increasing from 0 as the load increases until a heavy load is reached, at which timeMaintained at a stable value C, C being 0 orTo the point ofArbitrary values in between.
Fig. 9 is a schematic structural diagram of an electronic device 1000 according to an embodiment of the present invention. As shown in fig. 9, the electronic device 1000 includes a memory 1100, a processor 1200. The number of the memories 1100 and the processors 1200 may be one or more, and one memory 1100 and one processor 1200 are exemplified in fig. 9; the memory 1100 and the processor 1200 in the device may be connected by a bus or otherwise, for example in fig. 9.
The memory 1100 is used as a computer readable storage medium for storing a software program, a computer executable program, and a module, such as program instructions/modules corresponding to the soft start and light load control methods of the dual active bridge series resonant converter provided in any of the embodiments of the present invention. The processor 1200 implements the soft start and light load control methods of the dual active bridge series resonant converter described above by running software programs, instructions, and modules stored in the memory 1100.
The memory 1100 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for functions. In addition, memory 1100 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some examples, memory 1100 may further include memory located remotely from processor 1200, which may be connected to the device 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.
An embodiment of the present invention further provides a computer readable storage medium storing computer executable instructions for performing the soft start and light load control method of the dual active bridge series resonant converter as provided in any embodiment of the present invention.
An embodiment of the present invention further provides a computer program product, including a computer program or computer instructions, where the computer program or computer instructions are stored in a computer readable storage medium, and where a processor of a computer device reads the computer program or computer instructions from the computer readable storage medium, and where the processor executes the computer program or computer instructions, so that the computer device performs a soft start and light load control method of a dual active bridge series resonant converter as provided in any embodiment of the present invention.
The electronic device and the application scenario described in the embodiments of the present invention are for more clearly describing the technical solution of the embodiments of the present invention, and do not constitute a limitation on the technical solution provided by the embodiments of the present invention, and those skilled in the art can know that, with the evolution of the electronic device and the appearance of a new application scenario, the technical solution provided by the embodiments of the present invention is applicable to similar technical problems.
Those of ordinary skill in the art will appreciate that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof.
In a hardware implementation, the division between the functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed cooperatively by several physical components. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Furthermore, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media.
As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components may reside within a process or thread of execution and a component may be localized on one computer or distributed between 2 or more computers. Furthermore, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local or remote processes such as in accordance with a signal having one or more data packets (e.g., data from a local system, a distributed system, or two components interacting with one another across a network, such as the internet with other systems by way of the signal).
Claims (9)
1. The soft start and light load control method of the double active bridge series resonant converter is characterized by comprising the following steps:
determining an average output current of the dual-active bridge series resonant converter according to the phase shifting characteristic and the resonance characteristic of the dual-active bridge series resonant converter;
Acquiring an expected output current and a maximum switching frequency of the dual active bridge series resonant converter;
determining a phase control parameter for the dual active bridge series resonant converter based on the desired output current, the maximum switching frequency, and the average output current;
And generating soft start and light load control strategies of the double-active-bridge series resonant converter according to the phase control parameters.
2. The soft start and light load control method of a dual active bridge series resonant converter of claim 1, wherein the dual active bridge series resonant converter comprises a primary side two legs, a secondary side two legs, and a resonant cavity disposed between the primary side two legs and the secondary side two legs; the determining the average output current of the dual-active bridge series resonant converter according to the phase shifting characteristic and the resonance characteristic of the dual-active bridge series resonant converter comprises the following steps:
The method comprises the steps of obtaining fundamental waves of first voltage and fundamental waves of second voltage of the double-active-bridge series resonant converter, wherein the first voltage is first square wave voltage after phase shifting between two bridge arms of a primary side, the second voltage is second square wave voltage after phase shifting between two bridge arms of a secondary side, the amplitude of the first square wave voltage is equal to the amplitude of primary side input voltage, and the amplitude of the second square wave voltage is equal to the product of the amplitude of secondary side output voltage and the transformer ratio of the double-active-bridge series resonant converter;
Calculating the impedance of the resonant cavity;
And determining the average output current of the dual-active-bridge series resonant converter according to the fundamental wave of the first voltage, the fundamental wave of the second voltage and the impedance of the resonant cavity.
3. The method for soft start and light load control of a dual active bridge series resonant converter of claim 2, wherein said resonant cavity comprises a resonant inductance and a resonant capacitance; the calculation formula of the average output current is as follows:
；
，/>，/>；
Wherein, For the average output current,/>For the phase shift angle of the first square wave voltage,/>For the phase shift angle of the second square wave voltage,/>Is the phase shift angle between the two bridge arms of the primary side and the two bridge arms of the secondary side,/>Transformer ratio for the dual active bridge series resonant converter,/>For the magnitude of the first square wave voltage,/>For the impedance of the resonant cavity,/>Inductive reactance of the resonant inductance,/>Is the capacitive reactance of the resonance capacitor,/>For the switching frequency of the dual active bridge series resonant converter.
4. A method of soft start and light load control of a dual active bridge series resonant converter as recited in claim 3 wherein said determining phase control parameters for said dual active bridge series resonant converter based on said desired output current, said maximum switching frequency and said average output current comprises:
And substituting the expected output current and the maximum switching frequency into the calculation type of the average output current by taking the expected output current as the average output current of the double-active-bridge series resonant converter and taking the maximum switching frequency as the switching frequency of the double-active-bridge series resonant converter, and calculating to obtain the phase control parameter of the double-active-bridge series resonant converter.
5. The method of claim 4, wherein generating soft start and light load control strategies for the dual-active bridge series resonant converter based on the phase control parameters comprises:
when the phase control parameter is Controlling the phase shift angle/>, of the second square wave voltagePhase shift angle between two bridge arms of primary side and two bridge arms of secondary side/>Unchanged, regulate/>To achieve adjustment/>By adjusting/>Soft start and light load control are carried out on the double active bridge series resonant converter;
Wherein, For a desired output current of the dual active bridge series resonant converter,/>，，/>Is the maximum switching frequency of the dual active bridge series resonant converter.
6. The method of claim 4, wherein generating soft start and light load control strategies for the dual-active bridge series resonant converter based on the phase control parameters comprises:
when the phase control parameter is Controlling the phase shift angle/>, of the first square wave voltagePhase shift angle between two bridge arms of primary side and two bridge arms of secondary side/>Unchanged, regulate/>To achieve adjustment/>By adjusting/>Soft start and light load control are carried out on the double active bridge series resonant converter;
Wherein, For a desired output current of the dual active bridge series resonant converter,/>，，/>Is the maximum switching frequency of the dual active bridge series resonant converter.
7. The method of claim 4, wherein generating soft start and light load control strategies for the dual-active bridge series resonant converter based on the phase control parameters comprises:
when the phase control parameter is Controlling the phase shift angle/>, of the first square wave voltagePhase shift angle/>, of the second square wave voltageUnchanged, regulate/>To achieve adjustment/>By adjusting/>Soft start and light load control are carried out on the double active bridge series resonant converter;
Wherein, For a desired output current of the dual active bridge series resonant converter,/>，， />Is the maximum switching frequency of the dual active bridge series resonant converter.
8. An electronic device, comprising:
At least one processor;
At least one memory for storing at least one program;
A soft start and light load control method of a dual active bridge series resonant converter as claimed in any one of claims 1 to 7 when at least one of said programs is executed by at least one of said processors.
9. A computer-readable storage medium, in which a processor-executable program is stored, which when executed by a processor is configured to implement the soft start and light load control method of the dual active bridge series resonant converter according to any one of claims 1 to 7.
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