Hybridge zero-current-switching rectifier for high-frequency DC-DC converter applications

An analysis and experimental verification of a hybridge current-driven zero-current-switching rectifier are given. In the hybridge rectifier, the diodes turn on at zero di/dt, low dv/dt, and turn off at low di/dt. Therefore, the hybridge rectifier is suitable for high-frequency high-efficiency applications. The current source driving the rectifier can be constituted by a class D or a class E inverter. Since these inverters operate with nearly zero switching losses, high power-density DC-DC converters can be assembled by using resonant inverters and hybridge rectifiers. A DC-DC converter based on a class D series resonant inverter and a hybridge rectifier was designed and tested for a constant output voltage Y_O=12 V and an output current I_O from no-load to 12 A. The converter was operated at a DC input voltage ranging from 200 to 380 V and a minimum frequency of f=600 kHz. The theoretical results and measured performances were in good agreement. A maximum converter efficiency as high as 90% has been achieved for the DC-DC converter operated at full load