Voltage-lift-type Cuk converters: topology and analysis

The voltage-lift (VL) technique is an effective method that could be applied in electronic circuit design. A series of negative output dc–dc converters (Voltage-lift-type Cûk converters) applying series Cûk implementing VL techniques is introduced. Compared with the Cûk converter prototype, these converters can perform positive to negative dc–dc voltage increasing conversion with higher voltage transfer gains. They are different from other existing dc–dc step-up converters and possess several advantages, mainly including fewer switches, clear conversion processes and a high output voltage with the small ripple. Since the proposed converters avoid using transformers and cascade connection, the relative simple structures are beneficial to potential practical applications in future. A detailed theoretical analysis for continuous and discontinuous conduction modes is given. Both simulation and experimental results are provided to verify the main characteristics.