Link logic control (LLC) resonant converter control method and control device

A technology of a resonant converter and a control method, which is applied in the fields of conversion equipment with intermediate conversion to AC, sustainable manufacturing/processing, climate sustainability, etc., can solve problems such as inability to control LLC converters, and achieve solutions. Designing difficult effects

Active Publication Date: 2010-08-11
EMERSON NETWORK POWER CO LTD
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  • Abstract
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Problems solved by technology

Therefore, the existing single-cycle control technology cannot be applied to the LLC converter to control the regulation of the LLC converter

Method used

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  • Link logic control (LLC) resonant converter control method and control device
  • Link logic control (LLC) resonant converter control method and control device
  • Link logic control (LLC) resonant converter control method and control device

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Embodiment Construction

[0034] The present invention will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0035] Introduced in the following embodiments is a single-cycle control technology suitable for application in frequency conversion systems such as LLC resonant converters. A new integral reset technology is adopted, and the single-cycle control principle is used to generate a constant duty ratio (usually 0.5). the control pulse. The control idea is: in a switching cycle, the on-time Ton is generated by integral comparison, and the off-time Toff is generated by a time control circuit, which is always equal to the on-time Ton to ensure a constant duty ratio. When the off-time Toff ends, The trigger pulse clock is given to start the next switching cycle. like figure 2 shown. In this way, the modulation frequency of the PFM can be adjusted by adjusting the conduction time Ton.

[0036] image 3 An embodiment of the present...

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Abstract

The invention discloses link logic control (LLC) resonant converter control method and control device. In a switching period, an on time Ton is generated through integration, an off time Toff is generated through a time control circuit and is always equal to Ton, the duty ratio is ensured constant, when the Toff is ended, a trigger impulse clock is given and a next switching period is started, therefore, the modulation frequency of a power factor meter (PFM) can be regulated through regulating the off time Ton; in addition, the reset of an integration signal is controlled by an impulse signal with proportioned impulse width and off time Ton, thereby realizing the regulation of an output voltage through regulating the working frequency of a converter.

Description

technical field [0001] The invention relates to nonlinear control technology, especially the control technology of LLC (double inductor plus capacitor) resonant converter. Background technique [0002] With the rapid development of power electronics technology, high power, high efficiency, and high power density have become a development trend of switching power supplies. Increasing the switching frequency is an effective solution, but the increase of the switching frequency brings about the problem of excessive loss of the switching tube, which cannot be solved by the traditional BUCK converter, but the resonant converter can better solve it This problem, and therefore the application of resonant converters, has been extensively studied and concerned. As a special circuit topology, the LLC resonant conversion circuit can not only meet the requirements of high frequency, but also achieve higher conversion efficiency, and has been widely used in the industry. [0003] The L...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28
CPCY02P80/10
Inventor 赵敬辉许峰
Owner EMERSON NETWORK POWER CO LTD
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