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Secondary side resonance type LLC conversion circuit

A conversion circuit and secondary side technology, applied in the direction of converting AC power input to DC power output, DC power input to DC power output, electrical components, etc., can solve problems such as complex control

Active Publication Date: 2021-01-26
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, when the traditional LLC resonant converter needs to use synchronous rectification to improve the efficiency of the rectification stage, the control is more complicated because the conduction time of the active switch in the rectifier stage is different from that in the inverter stage. , it needs to rely on the external current detection circuit to control the active switching tube in the rectification stage to turn off

Method used

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  • Secondary side resonance type LLC conversion circuit
  • Secondary side resonance type LLC conversion circuit
  • Secondary side resonance type LLC conversion circuit

Examples

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Embodiment Construction

[0026] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus their repeated descriptions will be omitted.

[0027] Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or mo...

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Abstract

The invention relates to a secondary side resonance type LLC conversion circuit. The circuit comprises an inverter stage, a secondary side resonant tank and an active voltage doubling rectifier, the inverter stage comprises an input diode, so that the magnetization inductance of the circuit is not limited by input voltage, a new voltage gain characteristic is formed, and zero-current switching-onand switching-off of an inverter stage active switch of the secondary side resonant LLC conversion circuit are realized. An input diode is turned off in a zero-current manner, and the active switch ofthe active voltage-multiplying rectifier is turned on in a zero-voltage manner. By introducing the additional input diode, the synchronous rectification efficiency of the circuit is improved, and thecost is reduced.

Description

technical field [0001] The present disclosure relates to the field of power electronics, in particular, to a secondary-side resonant LLC conversion circuit. Background technique [0002] The LLC resonant circuit is one of the main power stage topologies, which has many advantages: It operates under zero-voltage switching conditions in the entire load range (including light load), thereby achieving high efficiency; the operating frequency range is relatively narrow, which is convenient for high-frequency Design of the transformer and input filter; the voltage stress of the switches used on the primary side is clamped to the input voltage, while the voltage across the two diodes on the secondary side is always equal to twice the output voltage of the center-tapped transformer. [0003] However, when the traditional LLC resonant converter needs to use synchronous rectification to improve the efficiency of the rectification stage, the control is more complicated because the cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M7/5387
CPCH02M3/33592H02M7/53871H02M1/0058Y02B70/10
Inventor 贾鹏宇周京华
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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