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 Cu-k converters) applying series Cu-k implementing VL techniques is introduced. Compared with the Cu-k 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.