Milan M. Jovanović's Work and Impact on Power Electronics Industry
Milan M. Jovanović, a highly influential researcher in the power electronics field, has made significant contributions to the industry through his work on AC/DC power supplies, power semiconductor devices, and voltage regulation modules. His philosophy of creating greener solutions has led to efficiency improvements in power systems, reducing energy consumption and electronic waste. His legacy continues to inspire power electronics professionals worldwide.
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MILAN M. JOVANOVIS WORK AND IMPACT ON THE POWER ELECTRONICS INDUSTRY MILAN M. JOVANOVI POWER ELECTRONICS LAB Member of U.S. National Academy of Engineering IEEE Fellow Most cited industry-affiliated power electronics researcher in the world Published nearly 300 journal and conference papers Holds over 50 U.S. patents Milan M. Jovanovi 1952 - 2018
MILANS MAJOR RESEARCH AREAS MILAN M. JOVANOVI POWER ELECTRONICS LAB AC/DC POWER SUPPLIES FOR COMPUTER / TELECOM APPLICATIONS MODELING & EVALUATION OF POWER SEMICONDUCTOR DEVICES DESKTOP TELECOM SERVER NOTEBOOK ADAPTER QUASI-RESONANT CONVERTERS VOLTAGE REGULATION MODULES (VRMs) DATA CENTER ARCHITECTURES AUTOMOTIVE POWER ELECTRONICS LED DRIVERS http://t3.gstatic.com/images?q=tbn:ANd9GcROCjy1G_0ChkWB5C5qBw_0gI0GLX41ahbMxqvz44NlAup8HLsE
MILANS PHILOSOPHY MILAN M. JOVANOVI POWER ELECTRONICS LAB Making our world greener was Milan s philosophy that heavily influenced his work and achievements Efficiency improvements of ac/dc power systems through development, refinements, and optimization of power converter architectures, topologies, control, and power management techniques aimed at creating conditions for optimal use of semiconductor components and magnetic devices
MILANS WORK MILAN M. JOVANOVI POWER ELECTRONICS LAB Review of Milan s work is essentially review of history of power electronics technologies for modern server, telecom, and portable data-processing equipment, as well as for on-board electric vehicle applications in the last 35 years Impact of Milan s work on the power electronics industry is enormous Power supply techniques developed by research teams led by Milan have been employed in hundreds of millions power supplies made by Delta Electronics and other manufacturers, resulting in enormous cumulative energy savings and electronic-material waste reduction Milan s legacy will live through the R&D work of thousands of power electronics professionals worldwide, who will find inspiration in his great achievements and vision To honor Milan s work, Delta s Advanced R&D Power Electronics Lab in Research Triangle Park, NC has been named Milan M. Jovanovi Power Electronics Lab (MPEL)
MAJOR ACHIEVEMENTS CCM BOOST PFC WITH SOFT SWITCHING MILAN M. JOVANOVI POWER ELECTRONICS LAB To solve reverse-recovery losses of fast-recovery boost diodes when switched under hard-switching conditions, MPEL proposed a number of active-snubber circuits to control di/dt of boost diode current and to create conditions for ZVS of boost switch Two topologies were extensively utilized for power supplies in computer server and telecom equipment L B D L L S D D1 D2 C C L S T R V o C FR V I N DS RCC B RL V IN V o S L CC N1 N2 V C D C S S 1 DC S 1 From late 1990s until mid 2010s, majority of off-line power supplies for data centers employed one of these two topologies Since late 2010s, newly introduced SiC diodes that do not have reverse-recovery losses have replaced fast-recovery diodes active-snubber circuit were not used in new designs
MAJOR ACHIEVEMENTS SINGLE-STAGE FLYBACK ADAPTER WITH PFC MILAN M. JOVANOVI POWER ELECTRONICS LAB V X F o D 2 D L o a d 2 0 V 9 0 W L 1 S R P F C D vi n ii n N 5 + 2 N S C F I n p u t F i l t e r N 1 + ii n v C i n B D 6 9 0 - 2 6 4 VR M S D D 4 3 S W This adapter technology was the only single-stage adapter technology with PFC in the external power supply industry that met the EN61000-3-2 standard specifications on the line-current harmonics with a high efficiency around 90% In 15 years this technology has been implemented in more that 15 million notebook adapters for the universal-line voltage with a nameplate output power 75 W (mostly 75 W 85 W, and 90 W) manufactured by Delta due to its excellent performance and cost effectiveness
MAJOR ACHIEVEMENTS THREE-PHASE BOOST PFC (TAIPEI RECTIFIER) MILAN M. JOVANOVI POWER ELECTRONICS LAB Three-phase PFC rectifiers with three or more switches exhibit superior PF and input-current THD Three-phase PFC rectifiers with only one or two switches are increasingly employed in cost-sensitive applications such as battery chargers MPEL introduced a new three-phase, two-switch ZVS DCM PFC boost rectifier that achieves input- current THD < 5% over entire input-voltage and load-current ranges without using any additional soft-switching circuitry DCM CO1 D1 D2 D3 L 1 V A S1 + L C L 2 V B V O R CR 0 L 3 V C CO2 S2 D4 D5 D6 C1 C2 C3 N Virtual Neutral S1 S2 TYPICAL INPUT-CURRENT WAVEFORMS THD < 3% FREQUENCY CONTROL Dominant on Japanese telecom power supply market due to low cost and high performance Single Module 3kW
MAJOR ACHIEVEMENTS SERIES-RESONANT CONVERTER WITH REDUCED FREQUENCY-RANGE CONTROL MILAN M. JOVANOVI POWER ELECTRONICS LAB Resonant converters with wide input/output voltage ranges have drawback: operation at very wide switching frequency range reduced efficiency due to increased driving and magnetic component losses MPEL proposed a new control method with reduced switching frequency range for series- resonant converters by controlling output voltage with combined Variable-frequency control of primary-side switches Delay-time control of secondary-side SRs with respect to primary-side switches This technology is implemented in unidirectional and bidirectional On-Board Charger Modules (OBCMs) for electric vehicles 6.6 kW Bi-directional OBCM 11 kW Bi-directional OBCM
