Research On Non-isolated High-gain DC-DC Converter With Dickson Charge Pump

Renewable energy power generation technology,as a research hotspot in recent years,has been widely used in the field of new energy microgrids.In order to achieve energy storage,conversion and regulation,power electronic converters as intermediary modules are a key part of it.The non-isolated high-gain DC-DC converter is very suitable for distributed power generation due to its high power density and high efficiency characteristics.The traditional Dickson charge pump converter(DCPC)draws continuous current from the input source in an interleaved manner,which can easily obtain a high voltage gain,and the voltage stress on the converter is low.However,this converter will generate current spikes when the switch is turned off.In this thesis,the topology of the converter is improved,which effectively reduces the current spikes of the switch and achieves zero current shutdown of some diodes.In this thesis,the topology of DCPC is optimized,and a modified Dickson charge pump converter(M-DCPC)is proposed,which simplifies the design process and reduces the size of the converter.At the same time,a small resonant inductor is introduced into the M-DCPC to obtain a high-gain soft-switching converter,which realizes the soft switching of all the switchs and diodes,thereby reducing the circuit losses.In view of the shortcomings of M-DCPC’s insufficient input and output ports,a multi-input multi-output converter(MIMO-M-DCPC)is proposed,which can flexibly access multiple photovoltaic panels with different power and voltage levels,while allowing realize power sharing and MPPT at each input port,making the converter have higher fault tolerance and adjustability.In order to further study the working characteristics of MIMO-M-DCPC,by establishing a small signal model of the converter and introducing a decoupling network to decouple the system,a feedback compensation network is designed and a simulation model of the system closed-loop control is built.Simulation results verify that the converter after closed-loop compensation has good steady-state and transient performance.In view of the voltage mismatch between DCPC capacitors,this thesis expands the topology based on DCPC,by extracting the Dickson charge pump unit,after the unit reorganization and transformation,a boost topology with multiple Dickson units is formed,and then combined with the interleaved boost cell(IBC),a N stages Dickson charge pump converter(N-DCPC)is proposed,the simulation experiments confirmed that N-DCPC has the advantages of high voltage gain and low device voltage stress.