A Study on 3-phase Interleaved DC-DC Boost Converter Structure and Operation for Input Current Stress Reduction

Abstract

This paper analyses a 3-phase interleaved DC-DC boost converter for the conversion of low input voltage with high input current to higher DC output voltage. The operation of the 3-phase interleaved DC-DC boost converter with multi-parallel of boost converters is controlled by interleaved of switching signals with 120 degrees phase-shifted. Therefore, with this circuit configuraion, high input current is evenly shared among the parallel units and consequently the current stress is reduced on the circuit and semiconductor devices and contributes reduction of overall losses. The simulation and hardware results show that the current stress and the semiconductor conduction losses were reduced approximately 33% and 32%, respectively in the 3-phase interleaved DC-DC boost converter compared to the conventional DC-DC boost converters. Furthermore, the use of interleaving technique with continuous conduction mode on DC-DC boost converters is reducing input current and output voltage ripples to increase reliability and efficiency of boost converters.

Design and development of PWM switching for 5-level multiphase interleaved DC/DC boost converter using FPGA

“…When the n-switch is ON, the inductor current on n-phase is charging while the others are discharging. The inductor current rate of change can be calculated using (2) and 3:…”

“…There are types of DC/DC converters such as buck, boost, buck-boost, Sepic, Cuk and Flyback [1]. Conventional or single-phase DC/DC converters have certain limitations such as high current stress, high input current ripple, and less efficiency [2]. Another drawback is high conduction loss in the switching devices, which is a major constraint since it affects the output power of the converter [3].…”

Optimum Phase Selection of Multiphase Interleaved DC-DC Boost Converter for Current Stress and Switching Devices Losses Reduction

“…Normally, conventional DC-DC boost converter suffered high switching device losses and consequently will reduce the converter efficiency due to the limitation of circuit structure. Thus, in order to reduce the switching device losses, i.e., switching loss and conduction loss, an interleaving technique with multiphase circuit is introduced to achieve the reduction of inductor current ripple and current stress [5], [6]. Multiphase is defined as parallel branches of circuit, while interleaved can be defined as all branches are working in phase-shifted to each other by considering similar switching frequency and duty cycle [5]- [7].…”

“…Thus, in order to reduce the switching device losses, i.e., switching loss and conduction loss, an interleaving technique with multiphase circuit is introduced to achieve the reduction of inductor current ripple and current stress [5], [6]. Multiphase is defined as parallel branches of circuit, while interleaved can be defined as all branches are working in phase-shifted to each other by considering similar switching frequency and duty cycle [5]- [7]. According to the [5], [6], [8], [9], the main advantage of the multiphase IBC over the conventional DC-DC boost converter is it can solve the issues of current stress and inductor current ripple.…”

“…Multiphase is defined as parallel branches of circuit, while interleaved can be defined as all branches are working in phase-shifted to each other by considering similar switching frequency and duty cycle [5]- [7]. According to the [5], [6], [8], [9], the main advantage of the multiphase IBC over the conventional DC-DC boost converter is it can solve the issues of current stress and inductor current ripple. As mentioned in [10], when high current and low voltage at source are considered, a multiphase with an interleaving technique is considered to reduce the inductor current ripple as well as current stress.…”