Analysis method and device for LLC resonant converter
A technology of resonant converter and analysis method, which is applied in the direction of output power conversion device, DC power input conversion to DC power output, instrument, etc., can solve the problem that the working frequency of LLC resonant converter cannot be obtained accurately and affects the elements of LLC resonant converter Device selection and other issues
Active Publication Date: 2018-09-21
深圳市英能达电子有限公司
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Problems solved by technology
However, the problem existing in related technologies is that it is impossible to accurately obtain the operating frequency corresponding to the input voltage of the LLC resonant converter, which in turn affects the selection of components in the LLC resonant converter
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[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0029] The following describes the analysis method of the LLC resonant converter and the analysis device of the LLC resonant converter according to the embodiments of the present invention with reference to the accompanying drawings.
[0030] figure 1 It is an analysis method of an LLC resonant converter according to an embodiment of the present invention. Among them, such as figure 2 As shown, the LLC resonant converter includes a resonant capacitor Cr, a resonant inductance Lr and a magnetizing inductance Lm, wherein the mag...
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The invention discloses an analysis method and device for an LLC resonant converter. The method includes the following steps that: when the operating frequency of the LLC resonant converter is smallerthan the resonant frequencies of a resonant inductor and a resonant capacitor, a first time point, a second time point and a third time point are determined, and a first time period and a second timeperiod are constructed; the current function Icr0(t) and voltage function Ucr0(t) of the resonant capacitor in the first time period, the function ULr0(t) of the resonant inductor in the first time period, the voltage function ULm0(t) and current function ILm0(t) of a magnetizing inductor in the first time period, the current function Icr1(t) and the voltage function Ucr1(t) of the of the resonant capacitor in the second time period, and the current function ILm1(t) of the magnetizing inductor in the second time period are obtained; the constraint conditions of the resonant capacitor in the first time period and the second time period are obtained; and a relationship between the operation frequency of the LLC resonant converter and an input voltage is calculated according to the Icr0(t),ULr0(t), ULm0(t ), ILm0(t), Icr1(t), Ucr1(t) and ILml (t) as well as the constraint conditions. Therefore, a mathematical relationship between the operating frequency of the LLC resonant converter andthe input voltage can be obtained.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to an analysis method for an LLC resonant converter and an analysis device for an LLC resonant converter. Background technique [0002] Because the LLC resonant converter has significant advantages such as high efficiency, high power density and low interference, the LLC resonant converter is widely used in the development and design of switching power supplies. [0003] In the related art, the fundamental wave component of the square wave voltage is usually used to replace the input square wave voltage, and then the LLC resonant converter is analyzed and designed to obtain the gain function of the LLC resonant converter, and then the gain curve of the gain function is drawn. However, a problem in the related art is that the operating frequency corresponding to the input voltage of the LLC resonant converter cannot be accurately obtained, which further affects the selectio...
Claims
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Login to View More IPC IPC(8): H02M3/335G06F17/50
CPCG06F30/20H02M3/33569Y02B70/10
Inventor 赫文强张亮阮胜超沈定华
Owner 深圳市英能达电子有限公司