Light load operation method of LLC resonant converter

A resonant converter and light-load operation technology, applied in the direction of converting DC power input to DC power output, instruments, and adjusting electrical variables, etc., can solve the problems of output voltage ripple, poor voltage control ability, and low Burst frequency, etc., to achieve Effects of reduced ripple, low cost, and increased Burst frequency

Inactive Publication Date: 2019-08-02
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0008] Aiming at the above defects or improvement needs of the prior art, the present invention provides a light-load operation method of an LLC resonant converter, thereby solving the problem of poo

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  • Light load operation method of LLC resonant converter
  • Light load operation method of LLC resonant converter
  • Light load operation method of LLC resonant converter

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[0040] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but 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 conflict with each other.

[0041] The invention provides a light-load operation method of an LLC resonant converter, which can accurately control the output voltage, while minimizing the output voltage ripple, simple control and easy realization.

[0042] Such as figure 1 As shown, in the light-load operation method of the LLC resonant converter of the embodiment of the present invention, the LLC resonant converter includes a br...

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Abstract

The invention discloses a light load operation method of an LLC resonant converter. The method is characterized in that through utilizing closed-loop control Burst duty cycle under a light load, a degree of control freedom is added, and control precision of an output voltage is higher; through utilizing the closed-loop control Burst duty cycle, the voltage regulation process is smoother, and system robustness is stronger; the Burst frequency can be changed by a digital processor, compared with a traditional method, the Burst frequency can be increased, when output filter parameters are the same, output voltage ripples can be reduced, and the output power quality can be improved; compared with a traditional frequency hysteresis loop and a voltage hysteresis loop, fast detection and controlare not needed, requirements for a sampling rate and the control speed of the digital processor are not high, and easy realization and low cost are achieved.

Description

technical field [0001] The invention belongs to the technical field of DC / DC converters, and more specifically relates to a light-load operation method of an LLC resonant converter. Background technique [0002] High efficiency, high power density and high reliability have always been the development trend of switching converters. At present, resonant soft switching technology has been widely used in switching converters to improve converter efficiency and power density. The LLC resonant converter can realize the zero-voltage conduction of the input bridge switch tube, and can also realize the zero-current shutdown of the output rectifier diode within a certain load range, so it has the advantages of high efficiency, small size, and good electromagnetic compatibility. It has received extensive attention in recent years. [0003] Different from general converters, LLC resonant converters adopt pulse frequency modulation technology (Pulse Frequency Modulation, PFM), the opera...

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33569H02M1/0003Y02B70/10
Inventor 陈昌松李含其段善旭万文超蔡涛石林
Owner HUAZHONG UNIV OF SCI & TECH
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