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Advances in power electronics have made it possible to achieve high powerlevels, e.g., reaching GW in grids, or alternatively high output bandwidths,e.g., beyond MHz in communication. Achieving both simultaneously, however,remains challenging. Various applications, ranging from efficient multichannelwireless power transfer to cutting-edge medical and neuroscience applications,are demanding both high power and wide bandwidth. Conventional inverters canachieve high power and high quality at grid or specific frequency ranges butlose their fidelity when reaching higher output frequencies. Resonant circuitscan promise a high output frequency but only a narrow bandwidth. We overcomethe hardware challenges by combining gallium-nitride (GaN) transistors withmodular cascaded double-H bridge circuits and control that can manage typicaltiming and balancing issues. We developed a lightweight embedded controlsolution that includes an improved look-up-table digital synthesizer and anovel adaptive-bias-elimination nearest-level modulation. This solutioneffectively solves the conflict between a high power level and high outputbandwidth and can--in contrast to previous approaches--in principle be scaledin both dimensions. Our prototype exhibits a frequency range from DC to 5 MHzwith <18% total voltage distortion across the entire frequency spectrum, whileachieving a power level of >5 kW. We conducted tests by sweeping the outputfrequency and two channel-mixing trials, which included a practicalmagnetogenetics-oriented stimulation pulse and an entertaining trial toreproduce the famous Arecibo message with the current spectrum.

Design and Implementation of DC-to-5~MHz Wide-Bandwidth High-Power High-Fidelity Converter