System and method for implementing ultra-wide output voltage range on basis of LLC topology

An output voltage and topology technology, which is applied in the field of systems that realize an ultra-wide output voltage range, can solve the problems of increased loss of rectifier diodes and transformer resonance inductance, and achieve the effects of reducing switching losses, expanding the output voltage range, and having a simple structure.

Inactive Publication Date: 2017-05-31
STATE GRID INTELLIGENCE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, LLC adopts the PFM frequency modulation control method. When a wide voltage range output is required, the frequency modulation range is too wide. When the voltage is adjusted to a high level, it is easy to enter the ZCS state; Increased losses in diodes, transformers, resonant inductors

Method used

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  • System and method for implementing ultra-wide output voltage range on basis of LLC topology
  • System and method for implementing ultra-wide output voltage range on basis of LLC topology
  • System and method for implementing ultra-wide output voltage range on basis of LLC topology

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] A full bridge LLC topology such as figure 1 As shown, its composition can be broken down into the following parts:

[0025] DC input power Vin.

[0026] A full bridge composed of mosQ1, Q2, Q3, and Q4, in which D1, D2, D3, and D4 are internal parasitic diodes of mos, and C1, C2, C3, and C4 are internal DS parasitic capacitances of mos.

[0027] Resonant capacitor Cr.

[0028] Resonant inductance Lr.

[0029] A transformer with primary magnetizing inductance Lm has a turns ratio of n.

[0030] A full-bridge rectifier composed of diodes D5, D6, D7, and D8.

[0031] Filter capacitor Cf.

[0032] Load RL.

[0033] The resonant capacitor Cr, resonant inductance Lr (including the leakage inductance of the transformer), and the excitation inductance Lm of the full-bridge LLC form a resonant network.

[0034] In the topology, Q1 and Q4 use the sa...

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Abstract

The invention discloses a system for method for implementing an ultra-wide output voltage range on the basis of an LLC topology. The system comprises a full-bridge LLC topology structure, wherein a switching circuit is arranged on a bridge arm of a switching tube full-bridge circuit of the full-bridge LLC topology structure; and states of the switching circuit can be switched to form a switching tube half-bridge circuit. The system is simple in structure, switching between full-bridge LLC and half-bridge LLC can be realized, and a DC/DC part of a charging module can work nearby a resonance point in most cases to reduce switching loss. Compared with a mode of independently using a charging module of a full-bridge LLC and a charging module of a half-bridge LLC, the method has the advantages that the output voltage range can be expanded effectively under the condition that the cost is not increased, design of a resonant network is facilitated, and efficiency under low voltage is improved.

Description

technical field [0001] The invention relates to a system and method for realizing an ultra-wide output voltage range based on an LLC topology. Background technique [0002] With the industrialization of new energy electric vehicles and the continuous development of charging station facilities, the construction of charging piles has put forward requirements for small volume, high power density, high efficiency, and large output voltage range. In order to meet the charging needs of various vehicles on the market, charging piles are required to output a wide range of voltages, ranging from 200V to 750VDC. At present, the DCDC part of the charging module mostly adopts the LLC topology, and the LLC topology is not easy to realize in terms of a large output voltage range. LLC topology generally adopts full bridge and half bridge. [0003] However, regardless of the full-bridge or half-bridge method, the LLC topology adopts the PFM frequency modulation control method. When a wide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33569H02M1/0054Y02B70/10
Inventor 黄厚诚刘爱忠马文超胡勇于波峰唐亮李勇
Owner STATE GRID INTELLIGENCE TECH CO LTD
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