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Interleaved parallel LLC resonant converter with enhanced derating fault-tolerant operation capability

A technology of resonant converter and operating capability, which is applied in the direction of high-efficiency power electronic conversion, output power conversion device, DC power input conversion to DC power output, etc., can solve the problems of unfavorable promotion of full-bridge LLC resonant converter system, and achieve The effect of increased performance

Active Publication Date: 2020-03-13
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to realize topology reconstruction, the full-wave rectification and secondary structures of the two full-bridge LLC resonant converters need to be adjusted to different connections, which is not conducive to the extension to N interleaved parallel full-bridge LLC resonant converter systems

Method used

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  • Interleaved parallel LLC resonant converter with enhanced derating fault-tolerant operation capability
  • Interleaved parallel LLC resonant converter with enhanced derating fault-tolerant operation capability
  • Interleaved parallel LLC resonant converter with enhanced derating fault-tolerant operation capability

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Experimental program
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Effect test

Embodiment 1

[0024] Such as figure 1 As shown, the embodiment of the present invention includes N parallel-connected full-bridge LLC resonant converters and N(N-1) / 2 additional switches for enhancing derating fault-tolerant operation capability; in this embodiment, the ith full-bridge The secondary sides of the LLC resonant converter are respectively provided with i-1 additional switches for enhancing the capacity of derating fault-tolerant operation, i=1, 2...N. ;

[0025] The primary sides of N parallel-connected full-bridge LLC resonant converters share an input power supply V in , the secondary side shares an output load R, and the two ends of the output load R are connected in parallel with a filter capacitor C o . Each full-bridge LLC resonant converter includes four power switch tubes, four power diodes, a resonant inductor, a resonant capacitor and an isolation transformer;

[0026] On the primary side of the full-bridge LLC resonant converter, the first power switch S 1 and t...

Embodiment 2

[0031] refer to Figure 7 , as a simple replacement of Embodiment 1, it differs from Embodiment 1 in that the opposite end of the secondary winding of the second full-bridge LLC resonant converter is connected to the Nth full-bridge LLC resonant through an additional switch The terminal with the same name of the secondary winding of the converter, and the terminal with the same name of the secondary winding of the Nth full-bridge LLC resonant converter is no longer connected to the terminal with the same name of the secondary winding of the second full-bridge LLC resonant converter. There are multiple feasible connection schemes for the additional switching tubes, and it is only necessary to ensure that the secondary sides of any two LLC resonant converters are connected. Therefore, the connection relationship of Embodiments 1 and 2 should not be used to limit the protection scope of the present invention.

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Abstract

The invention provides an interleaved parallel LLC resonant converter with enhanced derating fault-tolerant operation capability. The interleaved parallel LLC resonant converter is characterized by comprising N full-bridge LLC resonant converters connected in parallel and additional switches used for enhancing the derating fault-tolerant operation capability, wherein the primary sides of the N full-bridge LLC resonant converters connected in parallel share one input power supply, and the secondary sides of the N full-bridge LLC resonant converters share one output load; N (N-1) / 2 additional switches are arranged at the secondary winding sides of the N full-bridge LLC resonant converters connected in parallel, and the two ends of each additional switch are connected to one ends of the secondary windings of the two different full-bridge LLC resonant converters respectively so as to achieve the interconnection of the secondary windings of any two full-bridge LLC resonant converters. The interleaved parallel LLC resonant converter with enhanced derating fault-tolerant operation capability is low in implementation cost.

Description

technical field [0001] The invention relates to a fault-tolerant operation technology of a DC converter, in particular to an interleaved parallel LLC resonant converter with low cost and enhanced derating fault-tolerant operation capability. Background technique [0002] LLC resonant converter can realize soft switching operation in the whole load range, effectively reduces switching loss, has the advantages of high efficiency, high frequency, high power density, etc., and has been widely used in electric vehicles, space shuttles and servers Power and other important occasions. As the demand for electric capacity continues to increase in practical applications, multiple full-bridge LLC resonant converter modules can be used in parallel to avoid excessive current stress on each module. Compared with a single converter, the multi-module parallel system also has natural advantages in dealing with fault-tolerant operation after unexpected failures. Theoretically, when a full-b...

Claims

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Application Information

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IPC IPC(8): H02M3/335H02M1/32
CPCH02M1/32H02M3/33523H02M3/33569H02M1/0067H02M1/325Y02B70/10
Inventor 陈桂鹏卿新林
Owner XIAMEN UNIV