Abstract
Recent studies on compact and lightweight electronic devices have demonstrated that the LLC resonant converter (LRC) can facilitate achieving high efficiency and high power density. Moreover, employing a planar transformer can further improve the overall system power density. Although the planar transformer can assist in reducing the size of the converter, its high magnetic coupling makes the leakage inductance too small for a resonant inductor in the LRC. Therefore, an extra inductor must be employed separately, leading a considerable decrease in the power density. From this reason, significant research on integrated magnetics has been conducted to combine a transformer and external inductor into a single core. However, they require additional wires or magnetic sheets, and their structures are complex and costly. To overcome these limitations, the integrated magnetics planar transformer (IMPT) for a high power density LRC is proposed in this paper. In the proposed approach, since the primary wire is split into each side leg of the EE-type magnetic core and each operates as a transformer and a resonant inductor alternatively, an external inductor or additional wires are unnecessary. In addition, since the magnetic flux density of the IMPT is approximately equivalent to that of conventional transformer, the core size and the number of turns are almost the same. Therefore, the proposed IMPT features higher efficiency and power density without additional size and costs. To confirm the validity of the proposed IMPT, the operational principles, theoretical analysis, design considerations, and experimental results from a 350 W prototype are presented.
Highlights
Today, most electronic devices and systems are becoming compact and lightweight but their power consumptions are continuously increased
The primary wire is split into each side leg of the EE-type magnetic core, and each operates as a transformer and inductor alternatively in every switching period
A lowprofile single planar transformer can be implemented without the need of an external inductor or additional wires
Summary
Most electronic devices and systems are becoming compact and lightweight but their power consumptions are continuously increased. Many approaches aimed at further increasing power density of the LRC have been the scope of many studies, considering these advantages. Magnetic components, such as a transformer and an inductor, are critical because they occupy a large amount of space in electronic systems. Power switches with excellent performance (i.e., small parasitic capacitors, high on and off speed, small turn on resistance) have been steadily released, a limitation is still existed in reducing the size of a magnetic device by increasing only the switching frequency [2,3,4]. The primary wire is split in half, and each wire is placed on each side leg of the EE- or UU-type magnetic core
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
