Dual Frequency Control Mode of Capacitor Series Parallel Boost Converter
In order to reduce the loss of switching devices of capacitor series parallel Boost converter under the traditional interleaving control mode,starting with the topology and control strategy analysis of capacitor series parallel Boost converter,the frequency of two switches is changed,and a dual frequency control mode with fixed low frequency duty cycle and high frequency modulation is proposed.Among them,the switch tube of the front stage independent Boost works at low frequency,and the mode of fixed duty cycle is adopted to reduce the switching loss.The switch tube of the back stage capacitor connected in series with Boost works at high frequency,and the output is adjusted by changing the duty cycle.At the same time,the two inductors are integrated through magnetic integration to reduce the volume and weight of the magnetic components and reduce the cost.The voltage gain,voltage stress and device loss are analyzed and compared with the traditional same frequency interleaver to demonstrate the feasibility of the proposed theory,give the minimum regulation rule of loss,and use EIE magnetic integration to reduce the volume.Finally,the correctness of the theoretical analysis is verified by building an experimental prototype.
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