A Intrinsic Current-Sharing Control with a Voltage Limiter for Wide Range Duty Cycle in Interleaved Voltage-Multiplier Boost Dc-Dc Converter

Project: National Science and Technology CouncilNational Science and Technology Council Academic Grants

Project Details

Abstract

The interleaved voltage-multiplier boost converter (IVMBC) exhibits very good performance in low conduction loss, acceptable switch stress, fast transient response and a very high power density. The bottleneck for application in interleaved topology lies in the current-sharing control, especially in the duty-ratio smaller than 0.5. As a result, some circuits due to the switching thermal stress inside the boost circuit are not uniform, causing system reliability problems. In this paper, an intrinsic current-sharing control method in wide range of duty ratio for an interleaved voltage-multiplier boost converter is proposed. Instead of complex current-sharing control in conventional interleaved voltage-multiplier boost converter, an effective current-sharing control method is designed with a voltage limiter. With this design, current-sharing can be achieved in the wide range of duty-ratio without a current sensor. Firstly, the analysis and model of the current-sharing mechanism of voltage-doublier boost converter is developed. Based upon amp-second balance strategy, the average state-space equation and open-loop transfer function of the voltage-multiplier can be obtained. The controller proportional-integral (PI-type) parameters can be determined by Bode plots. The proposed current-sharing control is implemented and demonstrated in a voltage-doubler in a Field Programmable Gate Array (FPGA) chip. The simulation results validate the current-sharing capability of the proposed method for increasing the system reliability in IVMBC.

Project IDs

Project ID:PB10907-2472
External Project ID:MOST109-2221-E182-026
StatusFinished
Effective start/end date01/08/2031/07/21

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