Magnetic integrated full-bridge LLC resonant converter

Abstract

The invention discloses a magnetic integrated full-bridge LLC resonant converter. The converter is characterized by comprising a primary side direct current power supply, an input filter capacitor, aprimary side inverter bridge, a resonance and voltage conversion (comprising a magnetic integrated structure and a resonance capacitor), a secondary side rectifier bridge, an output filter capacitor and an output load, energy is provided by a primary-side direct-current power supply, enters the resonance and voltage conversion part through inversion of a primary-side inverter bridge switching tube, passes through a secondary-side rectifier bridge diode and is finally provided for a load. According to the magnetic integration structure, the resonance inductor, the excitation inductor and the transformer are integrated in one magnetic core, the whole converter only comprises one magnetic element, the size of the magnetic element is effectively reduced, and the power density of the converteris improved. High-power, small-size and high-efficiency energy transmission can be realized under frequency conversion control, phase shift control and frequency conversion and phase shift hybrid control, and the resonant converter has the advantages of wide-range voltage input, the wide gain range, high transmission efficiency, easiness in realizing soft switching and the like.

Description

technical field [0001] The invention relates to power electronic magnetic integration technology, in particular to a magnetic integrated full-bridge LLC resonant converter. Background technique [0002] Because the LLC resonant converter using soft switching technology has the advantages of wide range voltage input, wide gain range, high transmission efficiency, and easy soft switching, etc., it has developed rapidly in recent years, and its application fields are constantly expanding. With the application of third-generation semiconductor devices such as silicon carbide and gallium nitride, converters are developing towards high frequency and high power density. However, the LLC resonant converter has a large number of magnetic components. According to statistics, the weight of magnetic components such as transformers and inductors accounts for 30% to 40% of the converter, and the volume accounts for about 20% to 30%. Therefore, the magnetic components become a limiting con...

AI Technical Summary

Problems solved by technology

[0003] In the actual design of the existing technology, the leakage inductance substitution method is usually used to integrate the inductor and transformer of the LLC resonant converter. Due to the small leakage inductance, the operating frequency range of the converter is limited; because the leakage inductance is not easy to control accurately, and the secondary side of the transformer is also Leakage inductance exists, resulting in increased converter losses

Images