Efficiency Optimization Method for Converter Parallel System Based on Parameter Optimization Method
An optimization method and efficiency optimization technology, applied in the field of converters, can solve the problems of unbalanced operation performance of parallel modules and the influence of parallel system operation efficiency, and achieve the effect of improving operation efficiency.
Active Publication Date: 2022-06-03
XIAN JIEHANG ELECTRONICS SCI & TECH CO LTD
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Problems solved by technology
The invention solves the problem in the prior art that due to the differences in the parallel modules of the Buck converter, when the conventional current sharing strategy is adopted, the operating performance of the parallel modules is unbalanced, and the operating efficiency of the parallel system is affected.
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[0108] The inverter parallel system in this embodiment is composed of three different Buck modules in parallel, such as figure 1 shown, the parallel system input voltage V in =24V, system output voltage V o = 12V, the system switching frequency f = 500kHz, the system's on-duty ratio D = 0.5, the parameters of the three parallel modules are shown in Table 1.
[0109] Table 1 Parallel module parameters
[0110] module one module two Module three R on (mΩ)
35 13.4 8.1 R L (mΩ)
19 1 7 L(μH) 50 10 30 t on (ns)
27 16 41 t off (ns)
49 20 44 V on (V)
0.6 0.6 0.6
[0111] figure 2 This is the numerical simulation result of the efficiency of the parallel system of Buck converters directly calculated according to the efficiency formula. Curve 1 is the efficiency curve of the parallel system when the parallel modules distribute the current evenly, and curve 2 is the current distribution of the para...
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The present invention provides an efficiency optimization method of converter parallel system based on parameter optimization method, establishes the mathematical model of the efficiency optimization problem of Buck converter parallel system, and eliminates the optimization problem in the parallel system efficiency optimization problem by adopting the method of substitution and elimination The equality constraints of variables, through the variable substitution method, eliminate the inequality constraints on the optimization variables in the parallel system efficiency optimization problem, transform the parallel system efficiency optimization constrained problem into an unconstrained optimization problem, and solve the problem that satisfies the highest operating efficiency of the converter parallel system The current distribution value of each parallel module. The present invention converts the efficiency optimization problem of the Buck converter parallel system into an unconstrained optimization problem by adopting the substitution elimination method and the variable replacement method, and obtains an analytical expression solution method for the efficiency optimization of the converter parallel system, and realizes The purpose of current distribution is to improve the operation performance of the modules, and to improve the operation efficiency of the converter parallel system.
Description
technical field [0001] The invention relates to the technical field of converters, in particular to a method for optimizing the efficiency of a DC-DC converter. Background technique [0002] DC-DC switching converter is the main component of switching power supply, which has been widely used in aerospace, communication, computer and other fields. With the development of converters, in order to solve the problems of increasing current stress, thermal stress and expensive power switching devices of a single converter, the parallel connection of multiple power modules is widely used in DC converters. [0003] At present, the research on the current control method of the parallel DC-DC converter has obtained a series of results, which can be mainly divided into: output impedance method, master-slave setting method, active current sharing method and so on. The proposed control methods have their own characteristics, but their basic starting point is the same, and the parallel mo...
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IPC IPC(8): H02M3/00H02M3/158H02J1/10
CPCH02M3/00H02M3/1584H02J1/102Y02B70/10
Inventor 李永峰宁超帆成军平
Owner XIAN JIEHANG ELECTRONICS SCI & TECH CO LTD