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A three-mode rectification topological structure based on a LLC resonant converter

A resonant converter and topological structure technology, applied in the direction of converting DC power input to DC power output, instruments, and adjusting electrical variables, etc., can solve the problem of slow dynamic response of LLC, unfavorable system stable operation, excessive output voltage ripple, etc. problem, to achieve the effect of improving conversion efficiency, stabilizing output voltage, and reducing voltage ripple

Active Publication Date: 2018-12-07
CHINA THREE GORGES UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The consequence of this method is that the output voltage ripple is too large, causing large electromagnetic interference, which is not conducive to the stable operation of the system.
Due to the narrow bandwidth, the LLC dynamic response speed is slow, and a new control method needs to be proposed to make up for the deficiency

Method used

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  • A three-mode rectification topological structure based on a LLC resonant converter
  • A three-mode rectification topological structure based on a LLC resonant converter
  • A three-mode rectification topological structure based on a LLC resonant converter

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Embodiment

[0055] The present invention relates to a multi-mode rectifier circuit, such as figure 1 As shown, the input voltage range of the LLC resonant converter is 360-400V, the rated input DC voltage is 380V, the output DC voltage is 33V, and the rated output power is 900W. ratio is 8, the resonant capacitor C r is 11nF, the resonant inductance L r is 36uH, the exciting inductance L m is 150uH. The entire topology is divided into two parts: the primary side and the secondary side of the transformer. The primary side includes a full-bridge structure composed of four MOS tubes Q1, Q2, Q3, and Q4 and an LLC resonant network (L r , C r , L m ).

[0056] As shown in Fig. 2(a), when the LLC resonant converter is in the heavy load state, all the switches adopt traditional frequency control. When the LLC resonant converter is in the no-load state, as shown in Fig. 2(b), the left bridge The control mode of the switch tube of the arm remains unchanged, the control signal of the switch t...

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Abstract

Provided is a three-mode rectification topological structure based on a LLC resonant converter. The primary side of a transformer comprises a full-bridge structure composed of four MOSFETs and the LLCresonant converter. The converter includes a resonant inductor, a resonant capacitor and a transformer magnetizing inductor. Without high-frequency driving, switching between a half-bridge, a full-bridge, a load and a transformer disconnection (no-load) mode is realized at the input and output sides while a light load and a heavy load are switched. Since high-frequency driving is not used, voltage ripples are reduced, and a bus voltage is controlled within the full load range. A current dead zone controller is used to achieve the purpose of current sharing. The secondary side of the transformer adopts a three-mode adjustable device. The secondary side of the transformer adopts a PWM controller to switch the heavy-load mode (full-bridge), light-load mode (half-bridge) and no-load mode, anda full-bridge rectification structure is adopted in the heavy-load mode. A half-bridge rectification structure is adopted in the light-load mode, thus achieving smooth transition from the heavy-loadmode to the light-load mode, minimizing of the output voltage ripples and synchronous switching in one-shot. In addition, the efficiency of synchronous rectification conversion is greatly raised.

Description

technical field [0001] The invention relates to a three-mode rectification topological structure based on an LLC resonant converter, and relates to the field of electric energy conversion. Background technique [0002] Due to its unique topological characteristics, LLC converters are widely used in switching power supplies. Compared with traditional power frequency transformers, LLC converters reduce weight, size, and cost while improving power quality. Resonant technology, as an optimization method to realize soft switching, has attracted widespread attention. The resonant network is its basic conversion unit. It is turned on or off under certain conditions, reducing switching loss and achieving the purpose of soft switching. [0003] An ideal synchronous rectifier should achieve the same electrical function as a diode rectifier to reduce the conduction loss. Since the MOSFET is turned on, it conducts bidirectionally, which is different from a diode. Therefore, it is neces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/14
CPCH02M1/14H02M3/33592Y02B70/10
Inventor 马辉赵金刚冯茂刘昊邦
Owner CHINA THREE GORGES UNIV
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