CN111509987A - Resonant converter, parameter optimization method and device thereof, and electronic equipment - Google Patents

Resonant converter, parameter optimization method and device thereof, and electronic equipment Download PDF

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Publication number
CN111509987A
CN111509987A CN202010430567.8A CN202010430567A CN111509987A CN 111509987 A CN111509987 A CN 111509987A CN 202010430567 A CN202010430567 A CN 202010430567A CN 111509987 A CN111509987 A CN 111509987A
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resonant
converter
calculating
inductance value
resonant converter
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徐伟
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Qingdao Nengfeng Electric Co ltd
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Qingdao Nengfeng Electric Co ltd
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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
    • H02M3/33584—Bidirectional converters
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention discloses a resonant converter and a parameter optimization method and device thereof, electronic equipment and a computer readable medium, wherein the method comprises the following steps: calculating a gain expression of the resonant converter; calculating the excitation inductance value according to the working result of the resonant converter; calculating a resonance inductance value and a resonance capacitance value according to the gain expression and the excitation inductance value; and calculating the parameters of the resonant converter according to the resonant inductance value and the resonant capacitance value. When the forward and reverse power of the resonant converter is transmitted, the forward and reverse characteristics are the same because the effect that the parameters are equivalent and symmetrical after the primary and secondary sides are equivalent according to the transformation ratio of the transformer is realized, and the equivalence and the substitution are easy to realize on the basis of an actual digital control algorithm. The purposes of zero voltage switching-on (ZVS) of a switching tube on the primary side of the converter and zero current switching-off (ZCS) of a diode on the secondary side can be well achieved, so that the converter can stably and efficiently carry power in two directions, and meanwhile, the size and the cost of a transformer are reduced.

Description

Resonant converter, parameter optimization method and device thereof, and electronic equipment
Technical Field
The invention relates to the field of photoelectric energy sources, in particular to a resonant converter, a parameter optimization method and device thereof, electronic equipment and a computer readable medium.
Background
In recent years, the application of electrochemical energy storage technology in China is rapidly developed and demonstrated and applied in each link of a power system, large-scale application conditions are basically provided, some matching policies actively encourage promotion of energy production and consumption revolution, healthy development of photovoltaic and energy storage business is promoted, clean energy of photovoltaic power generation is adopted, the energy storage technology is combined, power batteries are utilized in a gradient manner, and the method has advancement in many aspects.
The high-power isolated bidirectional DC/DC converter can realize the functions of direct current transformation, bidirectional energy transmission and electrical isolation, is widely applied to the fields of electric automobiles, renewable energy sources, direct current distribution systems, uninterruptible power supply systems, power electronic transformers and the like, and whether the high power density and the high transformation efficiency can be realized is always the key point and the difficulty of the design of the DC/DC converter, particularly, the bidirectional DC/DC converter at the end of an energy storage battery has higher requirements on efficiency, transformation ratio, reliability and the operation capability of various working modes, so that the LL C resonant converter with the soft switching characteristic and the wide gain range is not lost as a more ideal converter topology, and the key point of realizing the high-efficiency operation of the LL C resonant converter lies in the configuration and optimization of circuit parameters, so that the converter can still stably and efficiently operate under the bidirectional energy transmission condition of being connected to a high-voltage bus side and a low-voltage side through reasonable parameter design becomes an urgent problem to be solved.
LL C resonant converter has natural soft switch characteristic, can realize the zero voltage of the switching tube of the primary side inversion (ZVS) and zero current of the secondary side rectifier diode is turned off (ZCS) in wide input voltage and full load range, do not need any auxiliary network and control simply. at present, the application to two-way DC/DC converter of LL C resonant converter has been studied, wherein have adopted the topology of two-way LL C converter, but only traditional full bridge converter while working in reverse direction, have proposed a kind of asymmetric two-way C LL C resonant converter structure, have realized the soft switch both during two-way operation, but its forward and reverse operating characteristic is not the same, have increased the difficulty of design, have proposed the C LL C resonant converter of the symmetrical structure, but its gain of resonance point is smaller than 1 and influenced by the load, and the rectifier diode has not realized ZCS LL C converter can not be in forward and reverse direction operation, have gain of the soft switch characteristic of the C resonant converter of LL and the soft switch characteristic can not keep the two-way operation of the two-way resonant converter.
Disclosure of Invention
The resonant converter can realize bidirectional transmission power, has the soft switching characteristic of an LL C converter no matter in forward or reverse operation, does not need an additional buffer circuit, and can keep constant voltage gain from no load to full load.
One aspect of the present invention provides a resonant converter, comprising a first full-bridge converter and a second full-bridge converter, wherein a high frequency transformer is disposed between the first full-bridge converter and the second full-bridge converter, the first full-bridge converter comprises a first resonant inductor and a first resonant capacitor, the second full-bridge converter comprises a second resonant inductor and a second resonant capacitor,
when the resonant converter works in the forward direction, the exciting inductor is arranged on the first full-bridge converter, the first full-bridge converter applies a driving signal, and the second full-bridge converter does not apply the driving signal;
when the resonant converter works reversely, the excitation inductor is arranged on the second full-bridge converter, the first full-bridge converter does not apply the driving signal, and the second full-bridge converter applies the driving signal.
According to a preferred embodiment of the present invention, the first resonance capacitor and the second resonance capacitor have the same capacitance value, and the first resonance inductor and the second resonance inductor have the same inductance value.
A second aspect of the present invention provides a parameter optimization method for a resonant converter as described above, including:
calculating a gain expression of the resonant converter;
calculating the excitation inductance value according to the working result of the resonant converter;
calculating a resonance inductance value and a resonance capacitance value according to the gain expression and the excitation inductance value;
and calculating the parameters of the resonant converter according to the resonant inductance value and the resonant capacitance value.
According to a preferred embodiment of the present invention, the calculating the gain expression of the resonant converter further includes:
establishing an equivalent model of the resonant converter by a fundamental component method;
calculating a transfer function of the resonant converter according to the equivalent model;
and calculating a gain expression of the resonant converter according to the transfer function.
According to a preferred embodiment of the present invention, the calculating the excitation inductance value according to the operation result of the resonant converter further includes:
calculating the upper limit of the excitation inductance according to the capacitance value of the switching tube when the resonant converter works:
Figure BDA0002500383910000031
in the formula: cSFor switching the tubes in parallel (assuming C)S1-CS4All equal); t is tdeadIs the dead time of the trigger pulse.
According to a preferred embodiment of the present invention, the calculating a resonance inductance value and a resonance capacitance value according to the gain expression and the excitation inductance value further includes:
will be Q ═ ωrLm/(kReq) L obtaining the resonance inductance value by substituting the gain expression1＝L2＝Lm/kopt；
Calculating the resonance capacitance value as
Figure BDA0002500383910000032
According to a preferred embodiment of the present invention, the calculating the parameter of the resonant converter according to the resonant inductance value and the resonant capacitance value further includes:
and calculating parameters of the resonant converter according to the resonant inductance value, the resonant capacitance value and the actual transformation ratio coefficient of the high-frequency transformer.
A third aspect of the present invention provides a parameter optimization apparatus for a resonant converter, including:
the gain calculation module is used for calculating a gain expression of the resonant converter;
the excitation inductance value calculation module is used for calculating the excitation inductance value according to the working result of the resonant converter;
the resonance inductance value calculation module is used for calculating the resonance inductance value according to the gain expression and the excitation inductance value;
the resonance capacitance value calculation module is used for calculating a resonance capacitance value according to the gain expression and the excitation inductance value;
and the parameter calculation module is used for calculating the parameters of the resonant converter according to the resonant inductance value and the resonant capacitance value.
A fourth aspect of the present invention provides an electronic apparatus, wherein the electronic apparatus includes: a processor; and the number of the first and second groups,
a memory storing computer executable instructions that, when executed, cause the processor to perform any of the methods.
A fifth aspect of the invention provides a computer readable storage medium, wherein the computer readable storage medium stores one or more programs which, when executed by a processor, implement any of the methods.
The technical scheme of the invention has the following beneficial effects:
the invention adopts a fundamental wave analysis method to analyze the resonant frequency and the gain characteristic of the bidirectional full-bridge C LLL C resonant converter, and provides a simple and feasible parameter optimization design method applied to a direct-current transformer.
When the method is used for forward and reverse power transmission of the resonant converter, the forward and reverse characteristics are the same due to the effect of realizing the symmetry of the parameters after the equivalence of the primary side and the secondary side according to the transformation ratio of the transformer, and the equivalence and the substitution are easy to realize on the actual digital control algorithm. The purposes of zero voltage switching-on (ZVS) of a switching tube on the primary side of the converter and zero current switching-off (ZCS) of a diode on the secondary side of the converter can be well achieved, and the converter can stably and efficiently carry power in two directions.
In some magnetic integration applications, the primary side and the secondary side of the resonant inductor can be better symmetrical according to the transformation ratio by utilizing parameters such as transformer leakage inductance and the like, and the volume and the cost of the transformer are reduced, so that the power density of the converter can be further improved.
Drawings
In order to make the technical problems solved by the present invention, the technical means adopted and the technical effects obtained more clear, the following will describe in detail the embodiments of the present invention with reference to the accompanying drawings. It should be noted, however, that the drawings described below are only drawings of exemplary embodiments of the invention, from which other embodiments can be derived by those skilled in the art without inventive step.
FIG. 1 is a circuit topology of a resonant converter of the present invention;
FIG. 2 is a waveform diagram of the principal operation of a resonant converter of the present invention;
FIG. 3 is a flow chart of a method for optimizing parameters of a resonant converter in accordance with the present invention;
FIG. 4 is a fundamental equivalent model diagram of a resonant converter circuit of the present invention;
FIG. 5 is ω of the present inventionr/ω1Graph relating h and g;
FIG. 6 is a graph of efficiency under different load conditions simulated by the present invention;
FIG. 7 is a graph of gain curves under different loads simulated by the present invention;
FIG. 8 is a schematic diagram of a parameter optimization device of a resonant converter according to the present invention;
FIG. 9 is a schematic diagram of an electronic device structure of the battery recombination of the electric vehicle according to the present invention;
FIG. 10 is a schematic diagram of a computer-readable storage medium of the present invention.
Detailed Description
Exemplary embodiments of the present invention will now be described more fully with reference to the accompanying drawings. The exemplary embodiments, however, may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. The same reference numerals denote the same or similar elements, components, or parts in the drawings, and thus their repetitive description will be omitted.
Features, structures, characteristics or other details described in a particular embodiment do not preclude the fact that the features, structures, characteristics or other details may be combined in a suitable manner in one or more other embodiments in accordance with the technical idea of the invention.
In describing particular embodiments, the present invention has been described with reference to features, structures, characteristics or other details that are within the purview of one skilled in the art to provide a thorough understanding of the embodiments. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific features, structures, characteristics, or other details.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, or sections, these terms should not be construed as limiting. These phrases are used to distinguish one from another. For example, a first device may also be referred to as a second device without departing from the spirit of the present invention.
The term "and/or" and/or "includes any and all combinations of one or more of the associated listed items.
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
Fig. 1 is a circuit topology of a resonant converter of the present invention.
As shown in fig. 1, power devices S1, S2, S3, S4 and S5, S6, S7, S8 in the resonant converter respectively form two full-bridge converters, S1 to S8 are power switching tubes under the control of a single chip microcomputer program, L1 and L2 are resonant inductors, C1 and C2 are resonant capacitors, and L m is an excitation inductor, wherein the first full-bridge converter includes power switching tubes S1 to S4, resonant inductor L1, and resonant capacitor C L, the second full-bridge converter includes power switching tubes S L to S L, resonant inductor L2, and resonant capacitor C L, the state shown in fig. 1 is a forward operation state, in which excitation inductor L m is disposed on the first full-bridge converter, S L and S L add a driving signal with a duty ratio of 50%, to implement an inversion function, S L and S L are disposed in parallel with the same driving signal, when S L and S L are not added with the corresponding rectifying diodes.
In fig. 1, the target parameters include, depending on the desired port: input voltage UinOutput voltage UoTransmission power, resonant frequency fsDead time tdeadDetermining the converter resonant parameter includes LmFor high-frequency transformers TRL1And L2The resonant inductors respectively comprise leakage inductances of a primary side and a secondary side of the transformer; c1And C2Is a resonant capacitor.
The following detailed description of specific implementation modes is carried out by combining the accompanying drawings and embodiment parameters, according to the design method, a bidirectional full-bridge C LLL C resonant DC converter which realizes 400-48V voltage transformation from a DC bus to an energy storage battery side and has the power of 1kW is built, the model machine selects the elements of a control chip TMS320F2812(TI), a high-frequency transformer magnetic core EE42(PC40), a high-voltage side switch tube, an IPW65R310CFD, a low-voltage side switch tube and an IPP070N08N3, and main experimental parameters of the model machine are shown in Table 1:
Figure BDA0002500383910000071
TABLE 1
Fig. 2 is a diagram of the main operating waveforms of a resonant converter of the present invention. Fig. 2 is a waveform diagram of the resonant converter in the forward operation in the above embodiment.
Fig. 3 is a flow chart of a parameter optimization method of the resonant converter of the invention.
As shown in fig. 3, the method includes:
and S101, calculating a gain expression of the resonant converter.
Specifically, S101 can be divided into the following steps:
A. establishing an equivalent model of the resonant converter by a fundamental component method;
B. calculating a transfer function of the resonant converter according to the equivalent model;
C. and calculating a gain expression of the resonant converter according to the transfer function.
Specifically, according to the characteristic that the resonant converter generally works near a resonant frequency point, a current waveform is approximate to sine, and simplified equivalent analysis is performed by a fundamental component method, namely, energy can be transmitted only by a fundamental component of a switching frequency, so that the resonant converter is equivalent to a linear network to analyze the input and output characteristics of the resonant converter.
Step B specifically, fig. 4 is a fundamental wave equivalent model diagram of a resonant converter circuit of the present invention. As shown in FIG. 4, to simplify the analysis, a transformer T is usedRThe transformation ratio is set to 1: 1; u. ofAB1、uCD1The fundamental wave components of the voltages of the two points AB and CD are respectively; reqFor AC equivalent load coupling to the primary side, Req＝8Ro/p2Wherein R isoIs the output load.
Thus, the transfer function of the simplified circuit of the C LLL C resonant converter can be obtained as
Figure BDA0002500383910000081
According to the condition that the imaginary part of the transfer function is zero when resonance occurs, the method can be obtained
Figure BDA0002500383910000082
Defined as k-Lm/L1；h＝L2/L1；g＝C2/C1；
Figure BDA0002500383910000083
Figure BDA0002500383910000084
The above formula can be simplified into
Figure BDA0002500383910000085
In the formula: a is k + kh + h; b is k + k/g + h + 1/g; c 1/g
Due to LmMuch greater than L1The series resonant frequency of the equivalent circuit should be greater than the parallel resonant frequency, and the series resonant frequency at which the converter transfers energy should occur should be
Figure BDA0002500383910000086
FIG. 5 is ω of the present inventionr/ω1Graph of h and g using MAT L ABr/ω1Graph of the relationship between h and g, as shown in FIG. 5, ωr/ω 11 projection of the intersection line of the plane and the curved surface on the bottom surface, and the curve expression h g 1, the following relational expression can be obtained
Figure BDA0002500383910000091
Step C specifically, set the normalized frequency ωn＝ωs/ω1，
Figure BDA0002500383910000092
For characteristic impedance, Q ═ Z0/ReqFor the figure of merit, an expression for the converter gain can be obtained:
Figure BDA0002500383910000093
when the switch is operated at the resonant point frequency, i.e. ωs＝ωrThe gain can be simplified to
Figure BDA0002500383910000094
It can be seen that when h · g is 1, the gain of the C LLL C converter at the resonant frequency point is 1, regardless of the load, and the characteristic at this time is the same as that of the LL C resonant converter.
And S102, calculating the excitation inductance value according to the working result of the resonant converter.
In particular, in order to ensure the realization of soft switching, when the switching tube is turned off,the exciting current is ensured to be connected with a capacitor C in parallel to a switching tube in dead timeS1-CS4Whereby the upper limit of the magnetizing inductance is obtained
Figure BDA0002500383910000095
In the formula: cSFor switching the tubes in parallel (assuming C)S1-CS4All equal); t is tdeadIs the dead time of the trigger pulse.
In the embodiment, the transformation ratio of the transformer can be obtained according to the transformation relation of the voltage from the bus to the side of the energy storage battery of 400-48V
Figure BDA0002500383910000096
According to a known target switch resonance frequency fs100kHz and dead time tdead100ns, based on the defined formula for the excitation inductance obtained in step 5
Figure BDA0002500383910000097
Wherein, the capacitor C is connected in parallelsThe calculation L can be substituted according to the device specification of 162pFmLess than 768 muF, increasing the exciting inductance can effectively reduce the effective value of the current, thereby reducing the conduction loss, so the maximum value L is taken in the embodimentm＝768μF。
And S103, calculating a resonance inductance value and a resonance capacitance value according to the gain expression and the excitation inductance value.
Specifically, first, the resonance inductance value is calculated, and Q is made to ωrLm/(kReq) Substituting into the above gain formula, in which the gain is only equal to k and ωnIn this regard, the larger the k value, the smoother the voltage gain of the converter, and the smaller the corresponding Q. When the resonant frequency is fixed, the smaller the Q value is, the smaller the resonant inductance is, which is beneficial to the application of the magnetic integration technology, thereby improving the power density; the larger the resonant capacitance is, the smaller the capacitance voltage is, and a capacitor with lower withstand voltage can be selected. However, the larger the k value, the smaller the leakage inductanceThe leakage inductance of the transformer is not beneficial to the design of the high-frequency transformer, and the corresponding capacitance capacity is increased, so that the volume of the transformer is also increased. The value of k should be compromised by parameters of other elements, generally the selection interval is 5-20, and the value of k in this embodiment isoptThen, 20, the resonant inductance value is obtained:
L1＝L2＝Lm/kopt。
secondly, calculating a resonance capacitance value, and when the voltage regulation function is not needed, adopting open-loop fixed-frequency control by a C LLL C converter, wherein the frequency of a driving signal of a switch is omegasA square wave with a duty cycle of 50%. When the resonant frequency is equal to the switching frequency, i.e. ωs＝ωrAccording to L above1＝L2＝Lm/koptSo that a resonance capacitance value of
Figure BDA0002500383910000101
And S104, calculating parameters of the resonant converter according to the resonant inductance value and the resonant capacitance value.
Specifically, the parameter values of the resonant network can be obtained through the optimization design of the steps. The foregoing steps assume a high frequency transformer T for simplicity of analysisRHas a transformation ratio of 1, according to the fact of TRThe transformation ratio of (1) is n, and the parameters of the primary side are equivalent to the secondary side and multiplied by a coefficient (inductance 1/n)2Capacitance n2) And (4) finishing.
According to the relation of the resonance inductance and the excitation inductance obtained under the preset condition that the transformer transformation ratio is 1 in the steps, the conversion relation of the actual transformer transformation ratio is combined to obtain:
L1＝L2·n2＝Lm/kopt，kopt＝20，n＝8.33
L1＝38.4μH，L2＝0.553μH；
according to the relation between the resonance inductance and the resonance capacitance obtained under the preset condition that the transformer transformation ratio is 1 in the steps, the relation is obtained by combining the conversion relation of the actual transformer transformation ratio:
Figure BDA0002500383910000111
C1＝0.066μF，C2＝4.58μF。
FIG. 6 is a graph of efficiency under different load conditions simulated by the present invention.
Fig. 7 is a graph of the gain under different loads simulated by the present invention.
According to the design requirements of the embodiment, the calculated core parameters of the converter are substituted into the simulation model to perform the simulation of the efficiency and gain curves, and in the efficiency simulation curve in different load conditions in fig. 6, the maximum efficiency of forward operation is 95.8%, and the overall efficiency is slightly lower than that of forward operation in reverse operation. The main reasons for the lower efficiency in reverse operation are: the equivalent exciting current amplitude of the low-voltage side is n times (in the embodiment, n is 8.33) of the exciting current amplitude of the high-voltage side in the forward operation, and the conduction losses of the switching tubes S5, S6, S7 and S8 are increased. Fig. 7 shows a simulation curve of the normalized gain of the embodiment, and the converter can keep the output voltage stable whether the converter works in the forward direction or the reverse direction.
Those skilled in the art will appreciate that all or part of the steps to implement the above-described embodiments are implemented as programs (computer programs) executed by a computer data processing apparatus. When the computer program is executed, the method provided by the invention can be realized. Furthermore, the computer program may be stored in a computer readable storage medium, which may be a readable storage medium such as a magnetic disk, an optical disk, a ROM, a RAM, or a storage array composed of a plurality of storage media, such as a magnetic disk or a magnetic tape storage array. The storage medium is not limited to centralized storage, but may be distributed storage, such as cloud storage based on cloud computing.
Embodiments of the apparatus of the present invention are described below, which may be used to perform method embodiments of the present invention. The details described in the device embodiments of the invention should be regarded as complementary to the above-described method embodiments; reference is made to the above-described method embodiments for details not disclosed in the apparatus embodiments of the invention.
Those skilled in the art will appreciate that the modules in the above-described embodiments of the apparatus may be distributed as described in the apparatus, and may be correspondingly modified and distributed in one or more apparatuses other than the above-described embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules.
Fig. 8 is a schematic diagram of an electric vehicle battery reconfiguration device according to the present invention. As shown in fig. 8, the apparatus 200 includes:
a gain calculation module 201, configured to calculate a gain expression of the resonant converter;
an excitation inductance value calculation module 202, configured to calculate the excitation inductance value according to a working result of the resonant converter;
a resonance inductance value calculation module 203, configured to calculate a resonance inductance value according to the gain expression and the excitation inductance value;
a resonance capacitance value calculation module 204, configured to calculate a resonance capacitance value according to the gain expression and the excitation inductance value;
and a parameter calculating module 205, configured to calculate a parameter of the resonant converter according to the resonant inductance value and the resonant capacitance value.
In the following, embodiments of the electronic device of the present invention are described, which may be regarded as specific physical implementations for the above-described embodiments of the method and apparatus of the present invention. Details described in the embodiments of the electronic device of the invention should be considered supplementary to the embodiments of the method or apparatus described above; for details which are not disclosed in embodiments of the electronic device of the invention, reference may be made to the above-described embodiments of the method or the apparatus.
FIG. 9 is a schematic diagram of an electronic device structure of the battery recombination of the electric vehicle according to the present invention; an electronic device 400 according to this embodiment of the invention is described below with reference to fig. 9. The electronic device 400 shown in fig. 9 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present invention.
As shown in fig. 9, electronic device 400 is embodied in the form of a general purpose computing device. The components of electronic device 400 may include, but are not limited to: at least one processing unit 410, at least one memory unit 420, a bus 430 that connects the various system components (including the memory unit 420 and the processing unit 410), a display unit 440, and the like.
Wherein the storage unit stores program code executable by the processing unit 410 to cause the processing unit 410 to perform the steps according to various exemplary embodiments of the present invention described in the above-mentioned electronic prescription flow processing method section of the present specification. For example, the processing unit 410 may perform the steps as shown in fig. 1.
The storage unit 420 may include readable media in the form of volatile storage units, such as a random access memory unit (RAM)4201 and/or a cache memory unit 4202, and may further include a read only memory unit (ROM) 4203.
The storage unit 420 may also include a program/utility 4204 having a set (at least one) of program modules 4205, such program modules 4205 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.
Bus 430 may be any bus representing one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.
Electronic device 400 may also communicate with one or more external devices 500 (e.g., keyboard, pointing device, Bluetooth device, etc.), and may also communicate with one or more devices that enable a user to interact with electronic device 400, and/or with any devices (e.g., router, modem, etc.) that enable electronic device 400 to communicate with one or more other computing devices.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments of the present invention described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiment of the present invention can be embodied in the form of a software product, which can be stored in a computer-readable storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to make a computing device (which can be a personal computer, a server, or a network device, etc.) execute the above-mentioned method according to the present invention. The computer program, when executed by a data processing apparatus, enables the computer readable medium to implement the above-described method of the invention, namely: calculating a gain expression of the resonant converter; calculating the excitation inductance value according to the working result of the resonant converter; calculating a resonance inductance value and a resonance capacitance value according to the gain expression and the excitation inductance value; and calculating the parameters of the resonant converter according to the resonant inductance value and the resonant capacitance value.
FIG. 10 is a schematic diagram of a computer readable storage medium of the present invention, the computer program may be stored on one or more computer readable media, as shown in FIG. 10. The computer readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The computer readable storage medium may include a propagated data signal with readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable storage medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. Program code embodied on a readable storage medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including AN object oriented programming language such as Java, C + +, or the like, as well as conventional procedural programming languages, such as the "C" language or similar programming languages.
In summary, the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that some or all of the functionality of some or all of the components in embodiments in accordance with the invention may be implemented in practice using a general purpose data processing device such as a microprocessor or a Digital Signal Processor (DSP). The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
While the foregoing embodiments have described the objects, aspects and advantages of the present invention in further detail, it should be understood that the present invention is not inherently related to any particular computer, virtual machine or electronic device, and various general-purpose machines may be used to implement the present invention. The invention is not to be considered as limited to the specific embodiments thereof, but is to be understood as being modified in all respects, all changes and equivalents that come within the spirit and scope of the invention.

Claims (10)

1. A resonant converter is characterized by comprising a first full-bridge converter and a second full-bridge converter, wherein a high-frequency transformer is arranged between the first full-bridge converter and the second full-bridge converter, the first full-bridge converter comprises a first resonant inductor and a first resonant capacitor, the second full-bridge converter comprises a second resonant inductor and a second resonant capacitor,
when the resonant converter works in the forward direction, the exciting inductor is arranged on the first full-bridge converter, the first full-bridge converter applies a driving signal, and the second full-bridge converter does not apply the driving signal;
when the resonant converter works reversely, the excitation inductor is arranged on the second full-bridge converter, the first full-bridge converter does not apply the driving signal, and the second full-bridge converter applies the driving signal.
2. The resonant converter of claim 1, wherein the first resonant capacitor and the second resonant capacitor have the same capacitance value and the first resonant inductor and the second resonant inductor have the same inductance value.
3. A method of optimizing parameters of a resonant converter according to claim 1 or 2, comprising:
calculating a gain expression of the resonant converter;
calculating the excitation inductance value according to the working result of the resonant converter;
calculating a resonance inductance value and a resonance capacitance value according to the gain expression and the excitation inductance value;
and calculating the parameters of the resonant converter according to the resonant inductance value and the resonant capacitance value.
4. The method of claim 3, wherein the calculating the gain expression for the resonant converter further comprises:
establishing an equivalent model of the resonant converter by a fundamental component method;
calculating a transfer function of the resonant converter according to the equivalent model;
and calculating a gain expression of the resonant converter according to the transfer function.
5. The method of claim 3, wherein the calculating the excitation inductance value from the operation result of the resonant converter further comprises:
calculating the upper limit of the excitation inductance according to the capacitance value of the switching tube when the resonant converter works:
Figure FDA0002500383900000021
in the formula: cSFor switching the tubes in parallel (assuming C)S1-CS4All equal);tdeadis the dead time of the trigger pulse.
6. The method of claim 5, wherein calculating a resonance inductance value and a resonance capacitance value according to the gain expression and an excitation inductance value further comprises:
will be Q ═ ωrLm/(kReq) L obtaining the resonance inductance value by substituting the gain expression1＝L2＝Lm/kopt；
Calculating the resonance capacitance value as
Figure FDA0002500383900000022
7. The method of claim 6, wherein calculating the parameters of the resonant converter from the resonant inductance and capacitance values further comprises:
and calculating parameters of the resonant converter according to the resonant inductance value, the resonant capacitance value and the actual transformation ratio coefficient of the high-frequency transformer.
8. A parameter optimization apparatus for a resonant converter, comprising:
the gain calculation module is used for calculating a gain expression of the resonant converter;
the excitation inductance value calculation module is used for calculating the excitation inductance value according to the working result of the resonant converter;
the resonance inductance value calculation module is used for calculating the resonance inductance value according to the gain expression and the excitation inductance value;
the resonance capacitance value calculation module is used for calculating a resonance capacitance value according to the gain expression and the excitation inductance value;
and the parameter calculation module is used for calculating the parameters of the resonant converter according to the resonant inductance value and the resonant capacitance value.
9. An electronic device, wherein the electronic device comprises:
a processor; and the number of the first and second groups,
a memory storing computer-executable instructions that, when executed, cause the processor to perform the method of any of claims 3-7.
10. A computer readable storage medium, wherein the computer readable storage medium stores one or more programs which, when executed by a processor, implement the method of any of claims 3-7.
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