October / November 2021

www.epe2021.com EPE ECCE 2021 REVIEW 21 ASIC gate driver, which will also reduce the overall effort. This optimization technique is based on a two- stage sequential algorithm in which the optimal current profiles are identified. The obtained gate current profiles reduce the switching energies while maintaining similar device stress during turn- on and turn-off events. The evaluation showed superior switching performance for the current shaping compared to a voltage and unshaped current source drivers. The switching losses over the entire operating range were significantly reduced, especially at partial loads. At system level, the inverter losses were reduced by 45 % leading to a 7.6 % reduction of the total electrical drive losses over the WLTP driving cycle. Control Algorithm for a dual active bridge The Dual Active Bridge (DAB) converter is a galvanic isolated, bidirectional DC/DC converter. It consists of two full bridges, connected by a Medium FrequencyTransformer (MFT). The advantages of the DAB include high power density, good component utilization and high efficiency due to low switching losses. Advanced modulation schemes can improve Zero Voltage Switching (ZVS) behavior, converter efficiency in partial load or wide voltage gain scenarios. The paper “Transient Power Control Algorithm for a Dual Active Bridge” by Karlsruhe Institute of Technology (http://eti.kit.edu ) presents a novel approach for transitions between operating points. The method is applicable to arbitrary modulation schemes. Steady state operation is attained after one switching period while the correct power transfer during the transition is ensured. The novel TPC scheme for operation point transitions of the DAB, considering prevention of a transient offset in the inductor current and controlling the demanded power during the transition period, is based on the calculation of the rectifier current R , using a switching scheme derived from SPS modulation. While the measurement results show the expected behavior, small deviations due to neglected parasitic effects can be observed. It is shown that it is possible to combine the novel TPC scheme with other modulation schemes, which allows for efficient operation in steady state condition while preserving a good transient behavior. If a voltage controller is used, the improved dynamic behavior results in a faster response time of the DAB, enabling a better performance of the controller. AS To receive your own copy of Power Electronics Europe subscribe today at: www.power-mag.com SPONSORS 5-7 APRIL 2022 HALLS 9 & 10 NEC BIRMINGHAM 85%BOOKED! #SmartIndustryExpo www.smartindustry-expo.com Damien Oxlee +44 (0)1732 370342 damien.oxlee@dfamedia.co.uk Andy Wylie +44 (0)1732 370341 andy.wylie@dfamedia.co.uk IN ASSOCIATION WITH: CO-LOCATED WITH: The Future of Integrated Automation SECURE YOUR STAND NOW Talking Industry