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BrainKorea21 FOUR Open Courseware KNU전자전기융합인재양성교육연구단

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홈 > 학문/산업 분야별

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전체강좌 6, 현재 1 / 전체 1 페이지
  • A design of 12-bit 125-MS/s 2.5-bit/Cycle SAR-based pipeline ADC employing a loop-based gain-boosting amplifier 영상 +강의담기

    학문/산업 분야별 ▶ 전력전자 ▶ 세미나 및 튜토리얼

     

    This seminar covers a different approach of loop-based gain-boosting technique to provide a better matching of pole-zero doublet and a smaller power consumption, while achieving DC gain as high as multi-stage amplifiers. As an example of how to use this amplifier, pipeline ADCs are chosen because it requires a residue amplifier between the stages. A proposed ADC architecture combines a multi-bit per cycle SAR ADC and a pipeline approach to achieve a high-speed performance. Also, a 2.5 bit/cycle SAR ADC is applied as a sub-ADC in pipeline stages, and a resistor-DAC is utilized for SAR and residue operation. As a result, the prototype ADC achieves 12-bit and 125-MS/s with a loop-based gain-boosting amplifier.

     

    더보기+

    강의기간 : 2023-11-23 ~ 2023-11-23 강의수 : 1 최근 업데이트 : 2023-12-01 조회 : 102

  • Active Cell Balancing Algorithm considering Cycle Life of Battery Systems 영상 +강의담기

    학문/산업 분야별 ▶ 전력전자 ▶ 세미나 및 튜토리얼

     

    Lithium-ion batteries are widely used in energy storage systems thanks to their high energy density and relatively long lifespan compared to other types of batteries. In this seminar, I will cover the design of the battery management system (BMS) for managing Li-ion battery systems, especially the circuit design and algorithms for active cell balancing. In particular, I introduce techniques aimed at alleviating issues like cell aging caused by cell heating in high-power applications such as electric vehicles.

     

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    강의기간 : 2023-08-09 ~ 2023-08-09 강의수 : 1 최근 업데이트 : 2023-08-14 조회 : 178

  • Miniaturizing Artificial-Intelligence-of-Things into a Millimeter Scale 영상 +강의담기

    학문/산업 분야별 ▶ 전력전자 ▶ 세미나 및 튜토리얼

     

    Miniature Internet-of-Things (IoT) systems have unique feature sets that include wireless communication, energy harvesting, and a small form factor, thus enabling non-invasive, secure placement for biomedical, ecological, surveillance, and infrastructure applications, among others. There has been substantial research on the miniaturization of IoT systems. The size of the bare die is often only 1-2 mm; however, the associated systems are typically much larger than just the die, resulting in centimeter-size systems due to included peripherals such as batteries and casings. This leads to a design challenge for the electronics of miniaturized systems because the maximum physical battery size and battery storage capacity are severely limited.

    In this talk, I will discuss the challenges in developing miniature IoT systems and introduce a millimeter-scale system platform. The system has been developed as the world’s smallest computer. To optimize circuit performance, the system is constructed from die fabricated in different technologies which are then stacked and wire-bonded together. The stacked structure increases silicon area per unit volume and makes it easy to swap layers in and out for flexibility in system configuration. Also, I will describe several examples of a low-power circuit technique that enables the system for energy harvesting, sensor interface, and reference circuits. Then, I will introduce two interesting use scenarios of miniature systems for ecological studies. Lastly, I will share his future research directions with different applications and discuss how to transform a miniature IoT device into a miniature “Artificial-Intelligence-of-Things (AIoT)” device.

     

    더보기+

    강의기간 : 2023-06-07 ~ 2023-06-07 강의수 : 1 최근 업데이트 : 2023-06-12 조회 : 161

  • Advanced control for efficient power conversion integrated circuits From high-power to RF systems 파일영상 +강의담기

    학문/산업 분야별 ▶ 전력전자 ▶ 세미나 및 튜토리얼

    Circuits and architectures for efficient power conversion have become crucial in emerging smart systems. Switching power amplifiers (PA) are very attractive for such applications, because they exhibit better efficiency compared to linear PA designs, due to saturated operation. Switching PAs also allow for utilization of deep submicron CMOS technologies, due to which these designs can be easily integrated with digital circuits, and can benefit from process scaling, in performance as well as in area.

    Pulse-width-modulation (PWM) is commonly used with switching PAs. A PWM signal typically employs a high-frequency switching pulse waveform as a carrier signal, wherein the pulse-width or duty-cycle of each pulse is modulated by a given low-frequency input signal. The carrier frequency can vary from several kHz to GHz, and is typically determined by the target application.

    In this presentation, advanced control for efficient power conversion circuits that use PWM from high-power to RF applications will be presented. I will present a digitally-intensive transmitter using RF-PWM with carrier-switching in the first part of the presentation. Proposed carrier switching concept not only allows the transmitter to drive modulated signals with large peak-to-average power ratio (PAPR), but also improves the back-off efficiency. The second part of the presentation, I will present a high-speed PWM driver with multi-level class-D PA. Employing a PLL-based PWM architecture enables high switching frequency operation with high linearity and a multi-level output stage provides high efficiency, at high switching frequency by reducing the switching levels. The final part of the presentation, I will present an efficient buck/buck-boost reconfigurable LED driver that supports PWM and pulse-frequency-modulation (PFM) operation. Power factor (PF) and total harmonic distortion (THD) are improved by employing proposed adequate reference control.

     

     

    강의기간 : 2018-11-21 ~ 2018-11-21 강의수 : 1 최근 업데이트 : 2018-11-21 조회 : 2148

  • PWM Converter Modeling and Compensation Design_ICPE 2015-ECCE Asia 파일영상 +강의담기

    학문/산업 분야별 ▶ 전력전자 ▶ 세미나 및 튜토리얼

    This tutorial lecture will cover the small-signal modeling, dynamic analysis, and control design of PWM dc-to-dc converters.

    더보기+

    강의기간 : 2015-06-01 ~ 2015-06-01 강의수 : 3 최근 업데이트 : 2016-12-26 조회 : 4873

  • Energy harvesting 영상 +강의담기

    학문/산업 분야별 ▶ 전력전자 ▶ 세미나 및 튜토리얼

     

    강의기간 : 2015-06-09 ~ 2015-06-09 강의수 : 1 최근 업데이트 : 2015-06-22 조회 : 3313

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