Ilan Yoscovich


Dr. Daniel Nahum Zmood


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A High Input Voltage Auxiliary Power Supply with High Step-Down Ratio

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A Five Level Transformer-less Single-Phase Photovoltaic Inverter based on Low Voltage MOSFETs and Reduced Common Mode Voltage Generation


A High Input Voltage Auxiliary Power Supply with High Step-Down Ratio - Power electronic converters require auxiliary supplies for the operation of their control logic and secondary systems such as main relays and fans. For renewable applications it is advantageous to generate this supply from the converter DC bus due to ride-though considerations, but this brings with it challenges for converters that have high DC input voltages as the power supply requires a high step-down ratio. Simple buck implementations at such voltages suffer from cost and availability of switches, parasitic switching issues and high turns ration transformer designs.

A Five Level Transformer-less Single-Phase Photovoltaic Inverter based on Low Voltage MOSFETs and Reduced Common Mode Voltage Generation - Transformer-less inverters are the predominant converter used in modern photovoltaic power systems due to their reduced cost and high efficiency. An essential feature of a Transformer-less inverter is reduced common mode voltage generation on the DC BUS to minimize parasitic leakage currents so that electrical faults can be detected using a residual current detector (RCD). Most modern commercial transformer-less inverters use topologies that minimize the common mode voltage and achieve 3 – Level PWM which allows a reduction in the size of the output filter and therefore reduced cost. This paper will present a Five level PWM single phase inverter that achieves reduced common mode leakage currents using low-cost low voltage MOSFETs. The topology will be presented, and its major features discussed, and experimental results provided to illustrates its improved performance.

  Ilan Yoscovich received his B.Sc. in Electrical Engineering (with honors) in 1995 and an M.Sc Electrical Engineering (with honors), both from Tel Aviv University. His major fields of interest include power electronics topologies, signal processing, electronics system and detailed design.

  Ilan joined SolarEdge in 2009 and serves as the Chief Technology Officer, responsible for leading future technology strategy, managing some of the most innovative PV power harvesting development activities within the Company and overseeing research and development and product activities with respect to technology, intellectual property, performance and cost structure. Prior to joining SolarEdge, Ilan served as Chief Technology Officer of Slyde Technologies, a wireless technology start-up company, between 2005 and 2008. Prior to that, Ilan spent 10 years with the Electronics Research Department (‘‘ERD’’), one of Israel’s national labs, which is tasked with developing innovative and complex systems. During this period, Ilan held various research and development and management positions. Ilan holds over 80 granted patents in the field of power electronics and electronic system design and control. the


  Dr. Daniel Nahum Zmood (S’97) received the B.S. degree (with honors) in Electrical Engineering from Monash University, Melbourne, Australia, in 1996 and the Ph.D. degree in power electronics from Monash University, Clayton, Australia, in 2003. His major fields of interest include the modulation and control of Power Electronics Converters, current regulation of sinusoidal converters, switch mode power supply design and control and signal processing. Daniel joined SolarEdge in 2015 and is a Director in R&D for Innovation and E-Mobility. Daniel led the development of SolarEdge’s first utility scale inverter; a compact 330kW inverter and is presently leading the development of SolarEdge’s eMobility inverter activities. He has published 12 papers at international conferences and in professional journals and has a number of Patents in various stages of assessment. Dr. Zmood is currently a member of the IEEE Industry Applications, IEEE Power Electronics, and IEEE Industrial Electronics Societies.