Optimization control method and device for multi-phase interleaving LLC converter
A technology of multi-phase interleaving and control method, which is applied in the field of optimal control of multi-phase interleaving and parallel LLC converters, can solve problems such as low efficiency, and achieve the effects of low cost, easy implementation and low cost
Active Publication Date: 2022-01-28
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
[0004] Aiming at the defects and improvement needs of the prior art, the present invention provides an optimal control method and device for a multi-phase interleaved parallel LLC resonant converter, aiming to solve the problem of the control method of the multi-phase interleaved parallel LLC resonant converter with average load distribution in the medium and low There are inefficiencies under load
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[0037] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0038] In the present invention, the terms "first", "second" and the like (if any) in the present invention and drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.
[0039] The present invention needs to model the output current ripple of each phase. In the example, starting from the working state of the single-phase circuit, a...
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The invention discloses an optimal control method and device for a multi-phase interleaving LLC converter, and belongs to the technical field of switching power supplies of power electronics. The method comprises the following steps: under the condition that loads are stable, for each load distribution scheme, firstly, calculating the theoretical switching frequency according to the phase with the heaviest load; then, on the basis of the theoretical switching frequency, calculating theoretical effective duty ratios of other phases when the phase with the heaviest load works under PFM (Pulse Frequency Modulation); then, calculating the output current ripple and loss of the LLC resonant converter corresponding to each load distribution scheme by utilizing the theoretical switching frequency and the effective duty ratio of each phase; and finally, constructing a cost function based on the output current ripple and the loss, and selecting a scheme with the lowest cost function value as an optimal load distribution scheme. Therefore, the problem of low efficiency of the current average distribution scheme of each phase of the traditional multi-phase interleaved parallel LLC converter under medium and low loads is solved, and comprehensive optimization of output current ripples and power supply efficiency under the medium and low loads is realized.
Description
technical field [0001] The invention belongs to the technical field of switching power supplies of power electronics, and more specifically relates to a multi-phase interleaved parallel LLC converter optimization control method and device. Background technique [0002] With the application and promotion of third-generation wide bandgap semiconductors such as SiC and GaN, the switching frequency of switching power supplies has been greatly increased, which has promoted the miniaturization and high power density of switching power supplies. LLC resonant converter has the advantages of simple structure, MOSFET zero-voltage switching, diode zero-current switching, low electromagnetic interference (EMI) and high conversion efficiency. It is suitable for the third generation of wide bandgap semiconductor devices and has been widely used in recent years. However, in order to achieve zero voltage switching of MOSFET and zero current switching of diode, LLC resonant converter operate...
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IPC IPC(8): H02M3/335H02M1/12H02M1/32
CPCH02M3/33569H02M1/126H02M1/32Y02B70/10
Inventor 刘洋王伟康张鹏
Owner HUAZHONG UNIV OF SCI & TECH