A Full Bridge llc Resonant Converter with Double Fault Tolerance

Abstract

The invention discloses a full-bridge LLC resonant converter with double fault tolerance, which comprises two full-bridge LLC resonant circuits and two auxiliary diodes; the primary side of the full-bridge LLC resonant circuit is a full-bridge circuit structure, and the secondary side is a Full-wave rectification circuit structure; the two auxiliary diodes are power diodes, which are used to reconfigure the topology of the secondary side during the second fault to ensure the normal operation of the converter. The converter of the present invention realizes the first fault tolerance through redundant circuit topology, realizes the second fault tolerance through topology reconstruction, and has the ability to maintain normal operation after suffering two faults. The control strategy of the converter of the present invention is simple, and the voltage and current stress of the switch tube on the primary side does not increase before and after the failure, simplifies the design of system control and circuit parameters, and reduces the device cost. In addition, the switching tubes on the primary side of the converter of the present invention can realize zero-voltage turn-on during operation, which improves the efficiency of the converter and avoids electromagnetic interference caused by hard switching.

Description

technical field [0001] The invention belongs to the field of power electronics and specifically designs a full-bridge LLC resonant converter with double fault tolerance. Background technique [0002] With the increasingly fierce competition in the aviation market, lower cost and more environmentally friendly aircraft have become a research hotspot for aviation manufacturers. In order to meet the ever-increasing requirements of the aviation industry, more electric aircraft technology has emerged. Different from traditional aircraft, it uses the power system as the main secondary energy system, replacing the mechanical, hydraulic and pneumatic systems of traditional aircraft, improving the comprehensive utilization efficiency of energy, effectively reducing aircraft emissions, and reducing the impact on the environment . At the same time, the use of electric energy as a secondary energy source makes it easier to optimize the energy structure, reduces the power demand for the...

AI Technical Summary

Problems solved by technology

But the converter can only withstand one failure

In addition, after a fault occurs, in order to ensure the same power output, the current stress of the switch tube on the primary side of the converter increases, which is greater than the normal operating value, which not only increases the cost of the device, but also brings inconvenience to the circuit parameter design

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