Parallel rectification topological structure and LLC resonant circuit

Abstract

The invention discloses a parallel rectification topological structure and an LLC resonant circuit. The parallel rectification topological structure comprises a plurality of rectification circuits, wherein each rectification circuit comprises a transformer and a rectification bridge which are connected with each other, and the rectification bridges of the rectification circuits are connected in parallel; in addition, the two adjacent rectification bridges share one bridge arm; and the transformers of the respective rectification circuits work synchronously, and the rectification circuits are controlled to be connected in series to be output or connected in parallel to be output through switching to synchronous same-phase operation or synchronous reversed-phase operation. According to the parallel rectification topological structure, the rectification bridges of the rectification circuits are connected in parallel, so that two adjacent rectification bridges share one bridge arm, and therectification circuits are controlled to be connected in series to be output or connected in parallel to be output through switching to synchronous same-phase operation or synchronous reversed-phaseoperation of the transformers of the rectification circuits, so that the device cost and the power loss are reduced; and moreover, the switching control is simple, the charging process is not requiredto be interrupted, and the application range is wider.

Description

technical field [0001] The invention relates to the technical field of circuit design, in particular to a parallel rectification topology and an LLC resonant circuit. Background technique [0002] With the emergence and development of electric vehicles, their holdings have been considerable, so the charging market for electric vehicles has also become very large, which requires the support of supporting charging equipment. Due to the demand for high-power chargers for electric vehicles, charging equipment is required to operate within a wide output range and provide the highest possible charging efficiency and reliability. In some existing charging schemes, an LLC resonant circuit is used to form a charging circuit. The LLC resonant circuit uses a resonant network including two inductors and a capacitor, and operates under zero-voltage switching conditions, thereby reducing switching loss and switching noise, and improving power conversion efficiency. [0003] However, in t...

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Problems solved by technology

However, if figure 1 In the scheme shown, the use of relays will increase the component cost of the rectification topology, and will also cause power loss and heat dissipation problems, and the contact switching process of the relay needs to stop charging, so the charging current will be interrupted, affecting charging efficiency, and Its reliability is also affected by the life of the relay contacts

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