Multilevel PRC-LCC resonant converter for X-ray generation

X-ray power supplies must operate under a wide variety of conditions. In fluoroscopy mode, they must transfer from 20 W to 1.2 kW, while in radiography mode they reach up to 100 kW. Input voltage range is also wide: from 400 to 750 V. Designers must achieve full power with lower input voltage, accepting important drops in efficiency under other circumstances. A two-inverter multilevel resonant topology is proposed to address these problems. Adapting the resonant elements, the resulting power stage is versatile enough to minimise the resonant current for both radiography and fluoroscopy. Input voltage fluctuations are compensated by the inverter operations.