Abstract
Single-cell battery power systems are a promising bus architecture for small scientific satellites. However, to bridge the huge voltage gap between a single-cell battery and power bus, bidirectional converters with a high voltage conversion ratio and a large current capability for the low-voltage side are necessary. This article proposes a bidirectional interleaved pulse width modulation (PWM) converter with a high voltage conversion ratio and an automatic current balancing capability. By adding capacitors to conventional interleaved PWM converters, not only are inductor currents automatically balanced without feedback control or current sensors, but also voltage conversion ratios at a given duty cycle can be enhanced. Furthermore, the added capacitors can reduce voltage stresses of switches and charged-discharged energies of inductors, realizing more efficient power conversion and reduced circuit volume in comparison with conventional converters. A 100-W prototype was built for experimental verification, and results demonstrated the fundamental characteristics and efficacy of the proposed converter.
Highlights
Vigorous research and development efforts for small scientific satellites are underway to realize frequent and low-cost scientific space missions
pulse width modulation (PWM) converter with high voltage conversion ratio and passive automatic current balancing capability has been proposed for single-cell battery power systems in
A bidirectional interleaved PWM converter with high voltage conversion ratio and passive automatic current balancing capability has been proposed for single-cell battery power systems in small scientific satellites
Summary
Vigorous research and development efforts for small scientific satellites are underway to realize frequent and low-cost scientific space missions. To bridge the huge voltage gap between the power bus (50 V) and single-cell battery (3.0–4.2 V for lithium-ion cells), a conventional nonisolated pulse width modulation (PWM) converter [Figure 2a] must operate with extremely high duty cycles (e.g., duty converters with such extreme duty cycles are duty cycle cyclegreater greaterthan than0.9). Interleaved converters, whichto equivalently consist of parallel-connected multiple PWM converters operating out of phase, are a favorable solution to mitigate current stresses of switches and inductors. PWMwith converter withconversion-ratio high voltage and automatic current balancingcurrent capability for single-cell battery power systems smallsystems scientific conversion-ratio and automatic balancing capability for single-cell battery in power in satellites. Reduce voltagethe stresses switches and charged-discharged of inductors, contributing to addedof capacitors reduce voltage stresses energies of switches and charged-discharged efficient conversion and reduced circuit power volume.
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