Resonant converter topology with wide output voltage range and control method thereof
A resonant converter and voltage range technology, which is applied in the direction of output power conversion device, electrical variable adjustment, control/regulation system, etc., can solve the problems of difficult optimization of converter parameters, decrease of power density, increase of cost, etc., to reduce design Difficulty, efficiency-enhancing, performance-enhancing effects
Active Publication Date: 2020-06-09
ZHEJIANG UNIV +1
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Problems solved by technology
[0002] The topologies of the conventional LLC resonant converter and the series resonant converter have been disclosed, but the conventional LLC converter and the series resonant converter are only suitable for the case where the output voltage gain range is narrow, and when the output voltage gain range is wide Occasions, such as LED dimming circuits, electric vehicle chargers, etc., the operating point of such resonant conversion will deviate far from the rated operating point, which makes it difficult to optimize the parameters of the converter, resulting in problems such as decreased power density, decreased efficiency, and increased costs.
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[0014] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0015] refer to figure 1 It is a specific wide output voltage range resonant converter topology, including a DC input power supply, three switching bridge arms, which are respectively connected across the two ends of the DC input power supply, and each bridge arm is connected in series with two full Controlled switches, in which: the upper and lower switches of the first bridge arm and their anti-parallel diodes are respectively S1, S6, Ds1, Ds6, and the upper and lower switches of the second bridge arm and their anti-parallel diodes are respectively S2 and S5 , Ds2, Ds5, the upper and lower switches of the third bridge arm and their anti-parallel diodes are S3, S4, Ds3, Ds4 respectively; The first resonant branch connected between the midpoint of the first bridge arm and the midpoint of the second bridge arm, the first resonant branch is composed of the first reson...
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The invention discloses a resonant converter topology with a wide output voltage range and a modulation method thereof. The topology comprises an input filter capacitor, three switch bridge arms formed by six switch tubes, two groups of resonance branches, two groups of full-bridge rectification circuits and an output filter capacitor. The control method comprises frequency conversion control of the resonant converter and mode switching control corresponding to different output voltage working conditions. The specific mode is that under the working condition that the required output voltage gain is small, the switch tubes of the middle bridge arm are all turned off, the bridge arms on the two sides adopt a variable-frequency resonant converter control method; and under the working condition that the required output voltage gain is large, the three bridge arms adopt the variable-frequency resonant converter control method at the same time, and the voltage gain range of the resonant converter is widened through mode switching control.
Description
technical field [0001] The present invention relates to a topology and a control method of a power electronic converter, and more particularly to a topology of a resonant converter with a wide output voltage range and a control method for realizing a wide voltage output range through mode switching. Background technique [0002] The topologies of the conventional LLC resonant converter and the series resonant converter have been disclosed, but the conventional LLC converter and the series resonant converter are only suitable for the case where the output voltage gain range is narrow, and when the output voltage gain range is wide Occasions, such as LED dimming circuits, electric vehicle chargers, etc., the operating point of this type of resonant conversion will deviate far from the rated operating point, which makes it difficult to optimize the parameters of the converter, resulting in problems such as decreased power density, decreased efficiency, and increased costs. . ...
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IPC IPC(8): H02M3/335
CPCH02M3/33523H02M3/3353H02M1/0058Y02B70/10
Inventor 杨得秋张军明徐德鸿王泽峰胡长生梅营金佑燮
Owner ZHEJIANG UNIV