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In this paper a non-isolating high voltage (800 V) bidirectional DCDC-converter with a so far unreached efficiency of up to 99.7 % is built and tested in detail. In order to reach this goal, a SiC-MOSFET half bridge is switched at its technical maximum switching speed (200 V/ns) using an extremely low inductive switching cell. This fast and low loss switching cell is attached to a large and highly...
This paper presents flip-chip bonding as an alternative to wire-bonding for commercially available silicon carbide (SiC) MOSFETs. A process was developed for the wire-bondless attachment of a SiC power MOSFET onto a substrate. The gate and source bond pads of commercially available MOSFETs are typically made of aluminum to aid the wire bonding process. The process for obtaining a finish suitable for...
In this paper, the design principles, procedures and considerations for a 3 kW high efficiency LLC resonant DC/DC transformer is presented. The efficiency-oriented design procedure involves analytical methods for calculating converter RMS current on both primary side and secondary side, transformer winding AC loss and MOSFET switching loss. These methods are reviewed in this paper. The resonant inductor...
The experimental results of high frequency SiC MOSFET inverter with the CCS050M12CM2 1200 V, 50 A module applied to a permanent magnet synchronous motor are described in this paper. Two versions of inverter design are compared. The first version of the inverter is designed in the same way as for a traditional IGBT inverter. However it couldn't function at nominal voltage due to voltage ringing caused...
In this paper, a multi-cell converter approach for a telecom rectifier module breaking through the efficiency and power density barriers of traditional single-cell converter systems is shown. The potential of the multi-cell approach for high efficiency is derived from fundamental scaling laws of the system performances, such as the losses generated by the semiconductors and the harmonic spectrum,...
This paper discusses design issues of the high-frequency, four-leg interleaved DC/DC boost converter (6kW/650V ) that combines high efficiency with high power density. Low switching energies of the applied SiC MOSFETs and Schottky diodes offer operation at high switching frequency. Together with suitable phase-shift of the control signals this leads to input/output current frequency multiplication...
The operating efficiency of the full bridge converters via one and two output inductors was evaluated and analyzed based on the same power devices, magnetic components, output voltage ripple and switching frequency, is presented in this paper. Since the core losses of the output inductor and primary MOSFET ZVS performance will be affected by the output inductance at different load currents, the operating...
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