A structure suitable for high power step-up llc resonant converter

Abstract

The invention discloses a structure applicable to a high-power boost LLC resonant converter, which comprises an inversion side, a rectification side, a transformer and a radiator, wherein the inversion side and the rectification side are connected with the transformer and jointly arranged above the radiator; the top of the inversion side is inserted with a driving board, and the driving board is inserted with a minimum system board; the inversion side is provided with two half-bridge modules, two resonant inductors and an inversion side PCB (Printed Circuit Board), and positive and negative bus copper sheets and a pair of resonant capacitor banks are respectively arranged on the inversion side PCB; the two resonant inductors are connected to an inversion side wiring terminal of the transformer through Litz wires; the rectification side includes four diode modules, a rectification side PCB is connected on the four diode modules, the rectification side PCB is provided with a filter capacitor bank formed by connecting five capacitors in parallel, and the four diode modules and the filter capacitor bank are connected with the transformer through the rectification side PCB. The structure achieves high power density under the premise of ensuring the heat dissipation and electromagnetic compatibility.

Description

technical field [0001] The invention belongs to the field of structure design of power electronic converters, and in particular relates to a structure suitable for high-power step-up LLC resonant converters. Background technique [0002] The rapid development of power electronics technology puts forward higher requirements for the power density and efficiency of the converter. The LLC resonant converter can realize the zero-voltage turn-on of the primary side switch tube and the zero-current turn-off of the secondary side rectifier tube. Its excellent soft switching characteristics can greatly reduce the switching loss and improve the efficiency; it can realize the high-frequency design of the switch, thereby increasing the power Density; at the same time, LLC resonant converter has wide input voltage range and small switch stress, these advantages make it a commonly used topology at present. [0003] High-power step-up LLC converter is a kind of practical application class...

AI Technical Summary

Problems solved by technology

In the structural design process of this type of converter, there are mainly the following problems: First, under normal circumstances, high power means that the active components (switch tubes, diodes) and passive components (inductors, capacitors, transformers) of the converter The size will also increase accordingly, and the arrangement of devices will be difficult, thus affecting the power density of the converter; second, the resonant current of the high-power step-up LLC converter is relatively large, and the heating elements in the converter, such as switching devices, resonant inductors, Transformers, heat dissipation is more difficult; third, the high-power main circuit with high-speed switching tubes is likely to cause electromagnetic interference to the control circuit, affecting the stability of the control, and it is also easy to cause electromagnetic pollution to the outside

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