Abstract
This paper presents the analysis of open loop power stage dynamics relevant to voltage mode control for elementary Luo DC-DC converter for certain specific applications like Hybrid Electric Vehicles, fuel cell vehicles. A comparative analysis is carried out on positive output super lift series of converters to evaluate voltage gain, output voltage ripple, stresses on the switches and efficiency. The most suitable converter is modelled and verified using State Space average method and Circuit averaging technique. The transfer function from duty cycle to output voltage and input voltage to output voltage are derived. The transfer function can be used in modelling the complete luo converter when voltage mode control is used. Also a simple efficiency modelling technique is proposed with computer simulation using MATLAB/SIMULINK that confirms the predicted results.
Highlights
Electrical power systems in future hybrid and fuel cell vehicles may employ three voltage (14V, 42V and High Voltage (HV)) nets
High step up DC-DC converter is necessary for many applications such as FCV, HEV to step up the voltage to high level .One of the key blocks inside hybrid electric vehicles is the DC-DC converter for auxiliary power supply of electric loads
With the increasing demand of renewable energy sources, we have proposed superlift series of luo converter instead of boost converter, which is typically used in hybrid electric vehicle
Summary
Electrical power systems in future hybrid and fuel cell vehicles may employ three voltage (14V, 42V and High Voltage (HV)) nets. Switching frequency is 70100 kHz. Battery power systems often stack cells in series to achieve higher voltage. The Prius would need nearly 417 cells to power the motor. A Prius uses only 168 cells and boosts the battery voltage from 202 to 500 V. Voltage Lift (VL) technique is a popular method widely used in electronic circuit design. It has been successfully employed in dc/dc converter applications in recent years and opened a way to design high voltage gain converters. Accurate modelling of the power stage is necessary to determine closed-loop transfer functions
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