Research On High Gain Dual Input Converter With Multi-Switch Capacitor

With the development of the global economy,people’s demand for energy is growing.However,due to the unreasonable use of fossil fuels,global environmental pollution problems and energy crises have become increasingly serious.In recent years,in order to solve this problem,researchers in various professional fields have turned their attention to renewable energy.Renewable energy has received extensive attention due to its advantages of clean and environmental protection and large storage capacity.However,due to the low output voltage of the new energy supply unit,the DC bus or load requirements cannot be met;and the new energy supply unit is susceptible to weather and environmental factors,and the output is difficult to stabilize.In order to solve the problems of converters with new energy supply units mentioned above,three new topologies was proposed in this paper.In the three new topologies proposed in this paper,there are auxiliary power supply units to ensure the reliability of the system power supply,and the voltage gain of the converter is improved by using the boosting capability of the switched capacitors.Based on the traditional Boost converter,the idea of topology deduction with the second highest gain network was combined in this paper.The voltage gain of the second high gain network is the highest,and the voltage stress of the power device is small.The high gain network and the traditional dual input will be selected.The Boost converter is combined to use the energy storage unit as an auxiliary power supply unit to ensure the reliability of the system,and a control module that can control the working state of the input source is added to form the first high gain topology of the present invention.Switching capacitors.Based on the two-input high-gain topology of two capacitors,two switchingcapacitor boosting units replace the original one,forming two dual-input high-gain converters with three capacitors,further increasing the voltage gain of the converter.And reduce the voltage stress of a part of the power device.Firstly,the working modes of each working mode was analized in detail in this paper,and then gave its working principle,finally analized its basic working characteristics and derived the expression of its switching capacitor voltage through steady state analysis.Then,through The comparison between the topology of the two switched capacitors and the traditional two-input Boost converter illustrates the superiority of the two-capacitor topology.Finally,the superiority of the three-capacitor topology is illustrated by comparison with the topology with two switched capacitors.Aiming at the high-gain dual-input converter with multi-switch capacitor proposed in this paper,a control scheme suitable for dual-input converters with new energy supply units was adopted in this paper,so that the converter can work normally in various working modes.At the same time,it can meet the requirements of system power supply reliability,and carry out simulation verification and experimental verification.The feasibility of the topology and control scheme was verified by simulation and experiment.