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An interleaved parallel llc resonant converter with enhanced derating and fault-tolerant operation capability

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

Active Publication Date: 2020-11-27
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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  • An interleaved parallel llc resonant converter with enhanced derating and fault-tolerant operation capability
  • An interleaved parallel llc resonant converter with enhanced derating and fault-tolerant operation capability
  • An interleaved parallel llc resonant converter with enhanced derating and fault-tolerant operation capability

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Effect test

Embodiment 1

[0024] like 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 the ...

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 present invention provides an interleaved parallel LLC resonant converter with enhanced derating fault-tolerant operation capability, which is characterized in that it includes: N parallel full-bridge LLC resonant converters and an extra switch for enhancing derating fault-tolerant operation capability; The primary sides of the N parallel full-bridge LLC resonant converters share an input power supply, and the secondary sides share an output load; the secondary winding sides of the N parallel full-bridge LLC resonant converters are provided with N(N-1 ) / 2 additional switches, and the two ends of each of the additional switches are respectively connected to one end of the secondary winding of two different full-bridge LLC resonant converters, so as to realize the mutual connection of the secondary windings of any two full-bridge LLC resonant converters even. The above-mentioned interleaved parallel LLC resonant converter with enhanced derating fault-tolerant operation capability has low 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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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/32
CPCH02M1/32H02M3/33523H02M3/33569H02M1/0067H02M1/325Y02B70/10
Inventor 陈桂鹏卿新林
Owner XIAMEN UNIV