Abstract
The interleaved buck converter with an extended duty cycle is analyzed in terms of unexplored parasitic switching states that diminish the switch utilization and its safety due to high-magnitude charging and discharging currents. The analysis explains the origin of the states and their effects and demonstrates their correlation with the existing voltage ripple on flying capacitors. The article further demonstrates that the voltage ripple can no longer be arbitrarily chosen as parasitic states emerge whenever the ripple exceeds an identified critical value being equal to the twofold voltage drop on the diode. A simple design criterion for flying capacitance is proposed. For a limited set of battery-powered DC–DC converters, a solution permitting the use of smaller capacitance by adding an extra switch is proposed. The derived findings are verified using experimental and simulation results.
Highlights
DC–DC converters, capable to operate at a high voltage conversion ratio between the input Vin and output voltages Vout, are gaining noticeable consideration in different applications [1,2], ranging from point-of-load converters to converters in several hybrid vehicle configurations
The voltage rating of the switch is commonly reduced by applying multi-level DC–DC converters, such as the one with a flying capacitor [9,10,11,12,13,14]
This is certain for Commonly, when analyzing converters, bulky arevoltage implied, assuming output smoothing capacitor, which has the direct impact on capacitors the output quality andthe on the voltage ripple on the capacitor is small enough compared to its average voltage
Summary
DC–DC converters, capable to operate at a high voltage conversion ratio between the input Vin and output voltages Vout , are gaining noticeable consideration in different applications [1,2], ranging from point-of-load converters to converters in several hybrid vehicle configurations. The voltage rating of the switch is commonly reduced by applying multi-level DC–DC converters, such as the one with a flying capacitor [9,10,11,12,13,14] In this case, the switch utilization is increased at the price of increased control complexity. In order not to exceed the current rating of the individual switch, the complexity of control becomes problematic due to the increased number of current transducers but mostly as the current has to be evenly shared both in the steady state and during transients The advantages of both concepts, i.e. multi-level and multi-phase, have been successfully. DC–DC converters, bulky arevoltage implied, assuming output smoothing capacitor, which has the direct impact on capacitors the output quality andthe on the voltage ripple on the capacitor is small enough compared to its average voltage This is certain for electromagnetic interference (EMI).
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