CN117748966A - Efficiency optimal control method and system based on frequency self-adaptive phase-shifting modulation control - Google Patents
Efficiency optimal control method and system based on frequency self-adaptive phase-shifting modulation control Download PDFInfo
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Abstract
The invention provides an efficiency optimal control method and system based on frequency self-adaptive phase-shifting modulation control, which effectively control the working state of a converter by calculating the normalized direct-current voltage gain of the converter and utilizing the technology of combining frequency modulation and phase shifting, so that the working state of the converter can be regulated to output voltage in a certain range; an intelligent optimization algorithm is introduced to obtain an optimal phase shift angle, and the efficiency of the converter is maximized under the condition that the output voltage is unchanged, so that the performance of the system is improved, and the energy loss is reduced.
Description
Technical Field
The invention relates to the technical field of setting and controlling power electronics and semiconductor devices, in particular to an efficiency optimal control method and system based on frequency self-adaptive phase-shifting modulation control.
Background
LLC resonant converters are of great interest because the primary side switch can implement a zero voltage switch (ZVS Zero Voltage Switch) and the secondary side switch can implement a zero current switch (ZCS Zero Current Switch). It has the advantages of high efficiency, high power density, low electromagnetic interference, etc. Therefore, LLC resonant converters are widely used in new energy fields. For a conventional LLC converter, high efficiency can be achieved by soft switching when operating at the resonant frequency. However, in wide voltage gain applications, the switching frequency is far from the resonance point, resulting in larger circulating current losses and reduced efficiency. Furthermore, in high current applications, single phase LLC resonant converters often need to solve the problem of excessive current stress by connecting more switching devices in parallel or using passive devices with high current ratings. However, this may cause problems such as heat dissipation of the system, current sharing of the device, and reliability issues. The parallel LLC resonant converter has the advantages of small voltage stress and current stress, high efficiency, small current ripple and the like, and is an ideal scheme for solving the problems.
For converters, cost reduction has been a concern. The traditional parallel LLC resonant converter has the defect of higher cost, so that the adoption of the LLC converter and the active bridge type parallel hybrid LLC converter is a good choice, the number of passive devices is effectively reduced, and the cost of the converter is effectively reduced by adopting a method of mixing bridge arms of Si-based power devices and SiC-based power devices. However, when the hybrid LLC converter is applied to an application scenario with a wide voltage range, there is a disadvantage in that the voltage gain range is not large enough. Further, since the Si-based power device has a larger loss than the SiC-based power device, a new control method is required to reduce the loss of the inverter by controlling the current flowing through the Si-based power device and the SiC-based power device.
Disclosure of Invention
In view of the above, in order to solve the above-mentioned problems in the prior art, the present application proposes an efficiency optimal control method and system based on frequency adaptive phase shift modulation control.
The application solves the problems through the following technical means:
the first aspect of the present application provides an efficiency optimal control method based on frequency adaptive phase shift modulation control, including the following steps:
step S100, establishing an equivalent model based on circuit structures of an LLC resonance part and an auxiliary bridge part of the converter, and establishing a constraint equation through relations among input voltage, input current, output voltage and output current of the converter;
step 200, bringing fundamental components of LLC resonance part input voltage, auxiliary bridge part input voltage, fundamental components of converter output voltage and fundamental components of converter output current in the converter circuit into the constraint equation to obtain an expression of normalized DC voltage gain of the converter;
step S300, bringing electric energy parameters of an LLC resonance part and an auxiliary bridge part into an expression of a normalized direct-current voltage gain of the converter, and solving the normalized direct-current voltage gain of the converter;
and step 400, searching the frequency and the phase shift angle with optimal converter efficiency under the condition of maintaining the converter normalized direct current voltage gain unchanged by applying an intelligent optimization algorithm.
Further, the method for establishing an equivalent model based on the circuit structure of the LLC resonant part and the auxiliary bridge part of the converter, and establishing a constraint equation through the relation among the input voltage, the input current, the output voltage and the output current of the converter comprises the following steps:
the converter is divided into an LLC resonant section and an auxiliary bridge section, whereby four constraint equations can be derived:
；
wherein u is AB Input voltage i of LLC resonance part r1 For the input current of LLC resonant part, L r Is resonance inductance, j is complex unit, omega is angular resonance frequency, C r Is the resonance capacitance, i s Is the current of the secondary side, n 1 Transformer ratio, L, of LLC resonant part m1 Is a transformer Tr 1 Exciting inductance of u AC To assist the input voltage of the bridge section, i r2 To assist the input current of the bridge portion, n 2 To assist the transformer ratio of the bridge part, L m2 Is a transformer Tr 2 Exciting inductance of u o1 A secondary side transformer voltage for LLC resonance part, u o2 To assist the secondary side transformer voltage of the bridge section, u o Is the output voltage.
Further, the expression includes:
；
in phi 1 Is u AC (t) leadingPhase difference phi 2 Input voltage u to resonant tank AB Secondary side output voltage u of transformer with LLC resonance part o1 Phase difference between->Is the voltage U AB Is the fundamental component of U in For the input voltage to be applied to the circuit,is the voltage u AC Fundamental component, i s For the output current of the secondary side of the transformer, < >>Is i s Fundamental component, I O To output current, U O To output voltage omega s For the switching frequency f s T is a time function, D is a duty cycle,/>for outputting voltage U O Is included in the power supply system.
Further, the expression of the normalized dc voltage gain of the converter includes:
bringing the fundamental components of the voltage, current variables in the converter circuit into the constraint equation, the normalized DC voltage gain of the converter can be expressed as:
；
wherein,r is the quality factor of the resonant converter O For outputting resistance, f n To normalize the switching frequency (f n =f s /f r ），f s For switching frequency f r Is the resonant frequency, m is the inductance L m1 And inductance L r The ratio between.
Further, the converter can realize a voltage gain variation range between 0.5 and 2.0 according to a preset frequency and a phase shift angle.
Furthermore, by applying the intelligent optimization algorithm, the frequency and the phase shift angle with optimal converter efficiency are found under the condition of maintaining the normalized direct current voltage gain of the converter unchanged, and the method comprises the following steps:
step S401, initial adjustment of voltage gain is realized through preset frequency control and phase angle control;
step S402, calculating the efficiency of the current converter, determining an optimal phase shift angle through an intelligent algorithm, and calculating the new efficiency of the converter under the optimal phase shift angle;
step S403 judges whether the new efficiency of the updated converter is greater than the efficiency of the converter before updating, if yes, the step S404 is skipped, otherwise, the step S402 is skipped directly;
step S404 applies the optimal phase shift angle determined by the intelligent algorithm, stabilizes the output voltage by frequency modulation, and jumps to step S402.
Further, the initial adjustment of the voltage gain is achieved through preset frequency control and phase angle control, and the voltage gain is controlled in one of the following modes: phase shift control, fixed frequency phase shift control and fixed phase angle frequency modulation control.
Further, the step of implementing the initial adjustment of the voltage gain by the preset frequency control and phase angle control includes:
judging according to the value of the target voltage gain, and if the target voltage gain is more than or equal to 0.5 and less than 1.5, performing fixed frequency phase shift adjustment to the target voltage gain;
if the target voltage gain is greater than or equal to 1.5 and less than or equal to 2.0, performing fixed phase angular frequency modulation control to adjust to the target voltage gain;
if the value of the target voltage gain is not in the first two judging ranges, the effective voltage gain adjusting range of the converter is exceeded, and the voltage gain is adjusted to be the value closest to the target voltage gain in the effective range.
A second aspect of the present application provides an efficiency-optimized control system based on frequency-adaptive phase-shift modulation control, including:
the first processing module establishes an equivalent model based on the circuit structures of the LLC resonance part and the auxiliary bridge part of the converter, and establishes a constraint equation through the relation among the input voltage, the input current, the output voltage and the output current of the converter;
the second processing module brings fundamental components of LLC resonance part input voltage, auxiliary bridge part input voltage, fundamental components of converter output voltage and fundamental components of converter output current in the converter circuit into the constraint equation to obtain an expression of normalized direct current voltage gain of the converter;
the determining module brings the electric energy parameters of the LLC resonant part and the auxiliary bridge part into an expression of the normalized direct-current voltage gain of the converter, and solves the normalized direct-current voltage gain of the converter;
and the optimizing module is used for searching the frequency and the phase shift angle with optimal converter efficiency under the condition of maintaining the normalized direct current voltage gain of the converter unchanged by applying an intelligent optimizing algorithm.
Compared with the prior art, the invention has the beneficial effects that at least:
the invention provides an efficiency optimal control method and system based on frequency self-adaptive phase-shifting modulation control, which effectively control the working state of a converter by calculating the normalized direct-current voltage gain of the converter and utilizing the technology of combining frequency modulation and phase shifting, so that the working state of the converter can be regulated to output voltage in a certain range; an intelligent optimization algorithm is introduced to obtain an optimal phase shift angle, and the efficiency of the converter is maximized under the condition that the output voltage is unchanged, so that the performance of the system is improved, and the energy loss is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic circuit diagram of a hybrid bridge arm LLC converter of a Si-based power device and a SiC-based power device provided by the invention;
FIG. 2 is a schematic diagram of a frequency-based adaptive phase-shift modulation control and corresponding voltage gain according to the present invention;
FIG. 3 is a flow chart of an efficiency optimization control method based on frequency adaptive phase-shift modulation control provided by the invention;
FIG. 4 is a flow chart of optimizing converter efficiency using an intelligent optimization algorithm provided by the present invention;
fig. 5 is a schematic diagram of an efficiency optimization control system based on frequency adaptive phase-shift modulation control according to the present invention.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, the following detailed description of the technical solution of the present invention refers to the accompanying drawings and specific embodiments. It should be noted that the described embodiments are only some embodiments of the present invention, and not all embodiments, and that all other embodiments obtained by persons skilled in the art without making creative efforts based on the embodiments in the present invention are within the protection scope of the present invention.
In this application, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The technical terms referred to in this application are:
LLC is an abbreviation of the English "Inductor-Capacitor", chinese means "Inductor-Capacitor", representing three main components in LLC resonant converters, respectively: two series inductances and a parallel capacitor. These three components constitute the basic resonant circuit structure of the device.
A Si-based power device is a power semiconductor device manufactured using Silicon (Silicon) as a main material, and generally includes MOSFET (metal oxide semiconductor field effect transistor), BJT (bipolar junction transistor), IGBT (insulated gate bipolar transistor), and the like. They have the characteristics of high efficiency, low on-resistance, high voltage resistance and the like, the method has wide application in the fields of power supply conversion, motor control, automobile electronics and the like.
The SiC-based power device is a power semiconductor device manufactured with Silicon Carbide (Silicon Carbide) as a main material, and belongs to a third generation semiconductor. It has the advantages of higher breakdown electric field intensity, higher saturated electron drift velocity, lower dielectric constant and the like, can work under high temperature, high voltage, high frequency and other environments, and the switching frequency can be improved, the switching loss can be reduced, and the volume can be reduced, so that the method has wide application prospect in the power electronics field.
Example 1
Referring to a circuit schematic diagram of a Si-based power device and SiC-based power device hybrid bridge arm LLC converter of fig. 1, an embodiment of the present application provides a wide voltage gain control method based on frequency adaptive phase shift modulation control, including the following steps:
step S100, establishing an equivalent model based on circuit structures of an LLC resonance part and an auxiliary bridge part of the converter, and establishing a constraint equation through relations among input voltage, input current, output voltage and output current of the converter;
further, the method for establishing an equivalent model based on the circuit structure of the LLC resonant part and the auxiliary bridge part of the converter, and establishing a constraint equation through the relation among the input voltage, the input current, the output voltage and the output current of the converter comprises the following steps:
the converter is divided into an LLC resonant section and an auxiliary bridge section, whereby four constraint equations can be derived:
；
wherein u is AB Input voltage i of LLC resonance part r1 For the input current of LLC resonant part, L r Is resonance inductance, j is complex unit, omega is angular resonance frequency, C r Is the resonance capacitance, i s Is the current of the secondary side, n 1 Transformer ratio, L, of LLC resonant part m1 Is a transformer Tr 1 Exciting inductance of u AC To assist the input voltage of the bridge section, i r2 To assist the input current of the bridge portion, n 2 To assist the transformer ratio of the bridge part, L m2 Is a transformer Tr 2 Exciting inductance of u o1 A secondary side transformer voltage for LLC resonance part, u o2 To assist the secondary side transformer voltage of the bridge section, u o Is the output voltage.
Step 200, bringing fundamental components of LLC resonance part input voltage, auxiliary bridge part input voltage, fundamental components of converter output voltage and fundamental components of converter output current in the converter circuit into the constraint equation to obtain an expression of normalized DC voltage gain of the converter;
further, the expression includes:
；
in phi 1 Is u AC (t) leadingPhase difference phi 2 Input voltage u to resonant tank AB Secondary side output voltage u of transformer with LLC resonance part o1 Phase difference between->Is the voltage U AB Is the fundamental component of U in For the input voltage to be applied to the circuit,is the voltage u AC Fundamental component, i s For the output current of the secondary side of the transformer, < >>Is i s Fundamental component, I O To output current, U O To output voltage omega s For the switching frequency f s T is a time function, D is a duty cycle,/>for outputting voltage U O Is included in the power supply system.
Further, the expression of the normalized dc voltage gain of the converter includes:
bringing the fundamental components of the voltage, current variables in the converter circuit into the constraint equation, the normalized DC voltage gain of the converter can be expressed as:
；
wherein,r is the quality factor of the resonant converter O For outputting resistance, f n To normalize the switching frequency (f n =f s /f r ），f s For switching frequency f r Is the resonant frequency, m is the inductance L m1 And inductance L r The ratio between.
Step S300, bringing electric energy parameters of an LLC resonance part and an auxiliary bridge part into an expression of a normalized direct-current voltage gain of the converter, and solving the normalized direct-current voltage gain of the converter;
further, the converter can realize a voltage gain variation range between 0.5 and 2.0 according to a preset frequency and a phase shift angle.
Further, the step of implementing the initial adjustment of the voltage gain by the preset frequency control and phase angle control includes:
judging according to the value of the target voltage gain, and if the target voltage gain is more than or equal to 0.5 and less than 1.5, performing fixed frequency phase shift adjustment to the target voltage gain;
if the target voltage gain is greater than or equal to 1.5 and less than or equal to 2.0, performing fixed phase angular frequency modulation control to adjust to the target voltage gain;
if the value of the target voltage gain is not in the first two judging ranges, the effective voltage gain adjusting range of the converter is exceeded, and the voltage gain is adjusted to be the value closest to the target voltage gain in the effective range.
As shown in fig. 2, the converter of the present invention can achieve a voltage gain range from 0.5 to 2.0 by using a phase shift plus frequency modulation control method. The running track is from A to B, and corresponds to fixed frequency phase shift; corresponding to the fixed phase angle modulation from B to C; different gains can be realized through strategies of A to B and C to D, so that output voltage adjustment is realized, but the system efficiency is not the optimal scheme; because the output voltage can be adjusted by frequency modulation and phase shift, different frequency modulation and phase shift ratios exist for the same output voltage and gain. While different phase angles result in the currents of the corresponding Si-based and SiC-based power devices also changing, resulting in different converter efficiencies.
And step 400, searching the frequency and the phase shift angle with optimal converter efficiency under the condition of maintaining the converter normalized direct current voltage gain unchanged by applying an intelligent optimization algorithm.
Further, as shown in fig. 3, the method for obtaining the frequency and the phase shift angle with optimal converter efficiency by applying the intelligent optimization algorithm under the condition of maintaining the normalized dc voltage gain of the converter unchanged includes the following steps:
step S401, initial adjustment of voltage gain is realized through preset frequency control and phase angle control;
step S402, calculating the efficiency of the current converter, determining an optimal phase shift angle through an intelligent algorithm, and calculating the new efficiency of the converter under the optimal phase shift angle;
step S403 judges whether the new efficiency of the updated converter is greater than the efficiency of the converter before updating, if yes, the step S404 is skipped, otherwise, the step S402 is skipped directly;
step S404 applies the optimal phase shift angle determined by the intelligent algorithm, stabilizes the output voltage by frequency modulation, and jumps to step S402.
Further, the initial adjustment of the voltage gain is achieved through preset frequency control and phase angle control, and the voltage gain is controlled in one of the following modes: phase shift control, fixed frequency phase shift control and fixed phase angle frequency modulation control.
A second aspect of the present application provides an efficiency optimal control system based on frequency adaptive phase shift modulation control, including:
the first processing module establishes an equivalent model based on the circuit structures of the LLC resonance part and the auxiliary bridge part of the converter, and establishes a constraint equation through the relation among the input voltage, the input current, the output voltage and the output current of the converter;
the second processing module brings fundamental components of LLC resonance part input voltage, auxiliary bridge part input voltage, fundamental components of converter output voltage and fundamental components of converter output current in the converter circuit into the constraint equation to obtain an expression of normalized direct current voltage gain of the converter;
the determining module brings the electric energy parameters of the LLC resonant part and the auxiliary bridge part into an expression of the normalized direct-current voltage gain of the converter, and solves the normalized direct-current voltage gain of the converter;
and the optimizing module is used for searching the frequency and the phase shift angle with optimal converter efficiency under the condition of maintaining the normalized direct current voltage gain of the converter unchanged by applying an intelligent optimizing algorithm.
Compared with the prior art, the invention has the beneficial effects that at least:
the invention provides an efficiency optimal control method and system based on frequency self-adaptive phase-shifting modulation control, which effectively control the working state of a converter by calculating the normalized direct-current voltage gain of the converter and utilizing the technology of combining frequency modulation and phase shifting, so that the working state of the converter can be regulated to output voltage in a certain range; an intelligent optimization algorithm is introduced to obtain an optimal phase shift angle, and the efficiency of the converter is maximized under the condition that the output voltage is unchanged, so that the performance of the system is improved, and the energy loss is reduced.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. The efficiency optimal control method based on the frequency self-adaptive phase-shift modulation control is characterized by comprising the following steps of:
step S100, establishing an equivalent model based on circuit structures of an LLC resonance part and an auxiliary bridge part of the converter, and establishing a constraint equation through relations among input voltage, input current, output voltage and output current of the converter;
step 200, bringing fundamental components of LLC resonance part input voltage, auxiliary bridge part input voltage, fundamental components of converter output voltage and fundamental components of converter output current in the converter circuit into the constraint equation to obtain an expression of normalized DC voltage gain of the converter;
step S300, bringing electric energy parameters of an LLC resonance part and an auxiliary bridge part into an expression of a normalized direct-current voltage gain of the converter, and solving the normalized direct-current voltage gain of the converter;
and step 400, searching the frequency and the phase shift angle with optimal converter efficiency under the condition of maintaining the converter normalized direct current voltage gain unchanged by applying an intelligent optimization algorithm.
2. The method for optimizing control efficiency based on frequency adaptive phase shift modulation control according to claim 1, wherein the establishing an equivalent model based on the circuit structure of the LLC resonant section and auxiliary bridge section of the converter, and establishing a constraint equation by the relation among the input voltage, input current, output voltage and output current of the converter, comprises the steps of:
the converter is divided into an LLC resonant section and an auxiliary bridge section, whereby four constraint equations can be derived:
；
wherein u is AB Input voltage i of LLC resonance part r1 For the input current of LLC resonant part, L r Is resonance inductance, j is complex unit, omega is angular resonance frequency, C r Is the resonance capacitance, i s Is the current of the secondary side, n 1 Transformer ratio, L, of LLC resonant part m1 Is a transformer Tr 1 Exciting inductance of u AC To assist the input voltage of the bridge section, i r2 To assist the input current of the bridge portion, n 2 To assist the transformer ratio of the bridge part, L m2 Is a transformer Tr 2 Exciting inductance of u o1 A secondary side transformer voltage for LLC resonance part, u o2 To assist the secondary side transformer voltage of the bridge section, u o Is the output voltage.
3. The method of optimal efficiency control based on frequency adaptive phase shift modulation control according to claim 2, wherein the fundamental component of the LLC resonant section input voltage, the fundamental component of the auxiliary bridge section input voltage, the fundamental component of the converter output voltage, and the fundamental component of the converter output current are expressed by:
；
in phi 1 Is u AC (t) leadingPhase difference phi 2 Input voltage u to resonant tank AB Secondary side output voltage u of transformer with LLC resonance part o1 Phase difference between->Is the voltage U AB Is the fundamental component of U in For input voltage +.>Is the voltage u AC Fundamental component, i s For the output current of the secondary side of the transformer, < >>Is i s Fundamental component, I O To output current, U O To output voltage omega s For the switching frequency f s Is a function of time, D is a duty cycle, < >>For outputting voltage U O Is included in the power supply system.
4. The method for optimal control of efficiency based on frequency-adaptive phase-shift modulation control of claim 3, wherein the expression of normalized dc voltage gain of the converter comprises:
bringing the fundamental components of the voltage, current variables in the converter circuit into the constraint equation, the normalized DC voltage gain of the converter can be expressed as:
；
wherein,r is the quality factor of the resonant converter O For outputting resistance, f n To normalize the switching frequency (f n =f s /f r ），f s For switching frequency f r Is the resonant frequency, m is the inductance L m1 And inductance L r The ratio between.
5. The method for optimal control of efficiency based on frequency adaptive phase shift modulation control of claim 1, wherein said converter is capable of achieving a voltage gain variation range between 0.5 and 2.0 according to a preset frequency and phase shift angle.
6. The method for controlling the optimal efficiency based on the frequency-adaptive phase-shift modulation control according to claim 1, wherein the step of obtaining the frequency and the phase-shift angle with the optimal efficiency of the converter by applying the intelligent optimization algorithm while maintaining the gain of the normalized dc voltage of the converter is performed comprises the following steps:
step S401, initial adjustment of voltage gain is realized through preset frequency control and phase angle control;
step S402, calculating the efficiency of the current converter, determining an optimal phase shift angle through an intelligent algorithm, and calculating the new efficiency of the converter under the optimal phase shift angle;
step S403 judges whether the new efficiency of the updated converter is greater than the efficiency of the converter before updating, if yes, the step S404 is skipped, otherwise, the step S402 is skipped directly;
step S404 applies the optimal phase shift angle determined by the intelligent algorithm, stabilizes the output voltage by frequency modulation, and jumps to step S402.
7. The method for optimal control of efficiency based on frequency adaptive phase shift modulation control according to claim 6, wherein said initial adjustment of voltage gain is achieved by preset frequency control and phase angle control, controlled using one of the following modes: phase shift control, fixed frequency phase shift control and fixed phase angle frequency modulation control.
8. The method for optimal control of efficiency based on frequency adaptive phase shift modulation control according to claim 6, wherein said step of achieving initial adjustment of voltage gain by preset frequency control and phase angle control comprises:
judging according to the value of the target voltage gain, and if the target voltage gain is more than or equal to 0.5 and less than 1.5, performing fixed frequency phase shift adjustment to the target voltage gain;
if the target voltage gain is greater than or equal to 1.5 and less than or equal to 2.0, performing fixed phase angular frequency modulation control to adjust to the target voltage gain;
if the value of the target voltage gain is not in the first two judging ranges, the effective voltage gain adjusting range of the converter is exceeded, and the voltage gain is adjusted to be the value closest to the target voltage gain in the effective range.
9. An efficiency optimization control system based on frequency adaptive phase shift modulation control, comprising:
the first processing module establishes an equivalent model based on the circuit structures of the LLC resonance part and the auxiliary bridge part of the converter, and establishes a constraint equation through the relation among the input voltage, the input current, the output voltage and the output current of the converter;
the second processing module brings fundamental components of LLC resonance part input voltage, auxiliary bridge part input voltage, fundamental components of converter output voltage and fundamental components of converter output current in the converter circuit into the constraint equation to obtain an expression of normalized direct current voltage gain of the converter;
the determining module brings the electric energy parameters of the LLC resonant part and the auxiliary bridge part into an expression of the normalized direct-current voltage gain of the converter, and solves the normalized direct-current voltage gain of the converter;
and the optimizing module is used for searching the frequency and the phase shift angle with optimal converter efficiency under the condition of maintaining the normalized direct current voltage gain of the converter unchanged by applying an intelligent optimizing algorithm.
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| US20150162840A1 (en) * | 2010-02-18 | 2015-06-11 | Arda Power Inc | Dc-dc converter circuit using an llc circuit in the region of voltage gain above unity |
| CN108448898A (en) * | 2018-03-29 | 2018-08-24 | 合肥工业大学 | LLC based on phase shifting angle feedforward is without sensor synchronous rectification control method |
| CN115995985A (en) * | 2023-02-13 | 2023-04-21 | 重庆邮电大学 | Control method of bidirectional symmetrical LLC resonant converter |
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