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This paper presents an active balancing scheme for a 5-level flying capacitor converter operating with an effective switching frequency of 1 MHz. The proposed technique utilises only a single voltage transducer to sense the multilevel waveform. The states of the flying capacitor and bus voltages are estimated from multiple samples of the multilevel waveform over one switching period (4 µs for a single...
Power and control isolation is necessary for many applications including isolated gate drive supply, device characterisation and the testing of power electronics converters. Commonly the isolation stage is integrated directly into the converter and therefore cannot easily be repurposed for another project, serviced in case of failure or easily adjusted for other power supply requirements. This paper...
To overcome the limitations of existing gate drive topologies an improved gate drive concept is proposed to provide fast, controlled switching of power MOSFETs. The proposed topology exploits the cascode configuration with the inclusion of an active gate clamp to ensure that the driven MOSFET may be turned off under all load conditions. Key operating principles and advantages of the proposed gate...
A new small full bridge module for MMCC research is presented. Each full bridge converter cell is a single small (65 × 30 mm) multilayer PCB with two low voltage high current (22 V, 40 A) integrated half bridge ICs and the necessary isolated control signals and auxiliary power supply (2500 V isolation). All devices are surface mount, minimising cell height (4 mm) and parasitic inductance. Each converter...
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