1. High Frequency Planar Magnetics Modeling
1. High Frequency Planar Magnetics Modeling
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The momentum towards high efficiency, high frequency, and high power density in power supplies limits wide use of conventional wire-wound magnetic components. Planar-wound structures are generally created by laminating planar copper windings and disk-like dielectrics into multilayer PCBs that are enclosed by a low-profile magnetically permeable core. planar magnetics yields number of advantages such as low profile, excellent thermal characteristic, extremely good repeatability, modularity, easy manufacturing etc. Our research focus on its fundamental characteristics:
The momentum towards high efficiency, high frequency, and high power density in power supplies limits wide use of conventional wire-wound magnetic components. Planar-wound structures are generally created by laminating planar copper windings and disk-like dielectrics into multilayer PCBs that are enclosed by a low-profile magnetically permeable core. planar magnetics yields number of advantages such as low profile, excellent thermal characteristic, extremely good repeatability, modularity, easy manufacturing etc. Our research focus on its fundamental characteristics:
• Winding loss (Skin effect, Proximity effect, Fringing effect, Radical effect...)
• Winding loss (Skin effect, Proximity effect, Fringing effect, Radical effect...)
• Leakage inductance (Accurate model due to high frequency eddy current)
• Leakage inductance (Accurate model due to high frequency eddy current)
• Winding capacitance (Models for Z type and U type winding schemes...)
• Winding capacitance (Models for Z type and U type winding schemes...)
• Optimal winding layout ( Interleaved winding layouts, half-turn layouts ...)
• Optimal winding layout ( Interleaved winding layouts, half-turn layouts ...)
2. Magnetics Integration
2. Magnetics Integration
Magnetics integration has been seen as the most efficient way to shrink significantly in size of passive components. Discrete passive components with different functions such as transformers and inductors are assembled as one integrated device. Magnetics integration can be used in a wide range of power applications from several Watts to several kilo-Watts. Planar integrated magnetics (PIM) with multi-layer PCB has proven to be an effective means of reducing power converters' size, weight and cost, whilst also increasing power efficiency. Our research focus on:
Magnetics integration has been seen as the most efficient way to shrink significantly in size of passive components. Discrete passive components with different functions such as transformers and inductors are assembled as one integrated device. Magnetics integration can be used in a wide range of power applications from several Watts to several kilo-Watts. Planar integrated magnetics (PIM) with multi-layer PCB has proven to be an effective means of reducing power converters' size, weight and cost, whilst also increasing power efficiency. Our research focus on:
• Modeling of magnetics integration
• Modeling of magnetics integration
• Multiple-phase coupled inductors, and Matrix transformers
• Multiple-phase coupled inductors, and Matrix transformers
• LLC resonant converters (integrate the resonant inductor into the transformer)
• LLC resonant converters (integrate the resonant inductor into the transformer)
• Integrated EMI filters (integrate CM and DM chokes as well as capacitors)
• Integrated EMI filters (integrate CM and DM chokes as well as capacitors)
• New idea /core geometry for magnetics integration
• New idea /core geometry for magnetics integration
3. High Frequency, High Efficiency, and High Power Density (3-H) Switch-Mode Power Converters
3. High Frequency, High Efficiency, and High Power Density (3-H) Switch-Mode Power Converters
24-32 V input / 400 V output @ 400 W, 1 MHz switching frequency, peak efficiency is 97%, power density is 223 W/in3
24-32 V input / 400 V output @ 400 W, 1 MHz switching frequency, peak efficiency is 97%, power density is 223 W/in3
Applications: Fuel cell, Photovoltaic, TWTA
Applications: Fuel cell, Photovoltaic, TWTA
5-20 V input / 4 V output @ 40 W, 1 MHz switching frequency, peak efficiency is 98%, power density is 448 W/in3
5-20 V input / 4 V output @ 40 W, 1 MHz switching frequency, peak efficiency is 98%, power density is 448 W/in3
Applications: Server, PoL, Battery Charger
Applications: Server, PoL, Battery Charger
3-H power converters have been identified as one of the key challenges to achieving its vision of increased economic growth rate with a minimal environmental impact. Innovative solutions in power electronics integration will enable unprecedented performance of power converters, thereby creating unique and highly competitive solutions. Our research focuses on:
3-H power converters have been identified as one of the key challenges to achieving its vision of increased economic growth rate with a minimal environmental impact. Innovative solutions in power electronics integration will enable unprecedented performance of power converters, thereby creating unique and highly competitive solutions. Our research focuses on:
• Advanced Circuit Topologies & Architecture (especially for resonant converters)
• Advanced Circuit Topologies & Architecture (especially for resonant converters)
• GaN/SiC Applications & Characteristics
• GaN/SiC Applications & Characteristics
• MHz Magnetic Materials and Design Methodology
• MHz Magnetic Materials and Design Methodology
4. Wireless Power Transfer (WPT)
4. Wireless Power Transfer (WPT)
Wireless power transfer systems are expanding their applications toward smart machines such as service robots, automated guided vehicles, unmanned aerial vehicles, electric vehicles (EV), and many more. Our research targets to a fast charging with a low cost, small profile and light system as well as high transfer efficiency, thereby focus on:
Wireless power transfer systems are expanding their applications toward smart machines such as service robots, automated guided vehicles, unmanned aerial vehicles, electric vehicles (EV), and many more. Our research targets to a fast charging with a low cost, small profile and light system as well as high transfer efficiency, thereby focus on:
• Topology investigation (single stage regulation), as well as advanced control scheme
• Topology investigation (single stage regulation), as well as advanced control scheme
• Resonant Tanks and Coils Optimization Design
• Resonant Tanks and Coils Optimization Design
• Coils Misalignment
• Coils Misalignment
• Underwater WPT Investigation
• Underwater WPT Investigation
5. Microfabrication Inductor
5. Microfabrication Inductor
It is believed that the next level of improvement in power electronics will come from high frequency integrated power modules. Magnetic components such as inductors and transformers are limiting the development. The trend toward miniaturization and integration of magnetic components poses a highly non-trivial issue to be surmounted, and is creating new challenges in the fields of electronic engineering and materials science. This research is based upon a high-level cross-disciplinary collaboration which combines the needed top expertise on micro- and nanofabrication, electronic circuit design and magnetism.
It is believed that the next level of improvement in power electronics will come from high frequency integrated power modules. Magnetic components such as inductors and transformers are limiting the development. The trend toward miniaturization and integration of magnetic components poses a highly non-trivial issue to be surmounted, and is creating new challenges in the fields of electronic engineering and materials science. This research is based upon a high-level cross-disciplinary collaboration which combines the needed top expertise on micro- and nanofabrication, electronic circuit design and magnetism.
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