A battery-powered single-stage three-phase high step-up converter topology for micro DC-UPS

Abstract

A conventional battery-powered AC uninterruptible power supply (AC-UPS) that steps up low DC voltage to high DC voltage and cascades with the high frequency inverter is complicated in control and of low efficiency due to two-stage power conversion. This paper presents a threephase high step-up converter with a single-stage DC/DC power conversion suitable for micro DC-UPS applications. In this paper, the circuit operating theory and steady-state analysis of the proposed topology are first addressed then a 100 V/110 W circuit prototype is designed, built and applied in 24 Vbattery-powered micro DC-UPS for a 19 V/85 W laptop PC appliance. The feasibility and effectiveness of the proposed converter topology are confirmed with experimental results. The maximum conversion efficiency of the proposed converter is about 93.5%, and the overall efficiency of the designed system is high due to the losses in the power conversion process when reduced. Compared with the conventional AC-UPS, the proposed micro DC-UPS achieves potentially about 3% maximum energy savings.

A New Combined Boost Converter with Improved Voltage Gain as a Battery-Powered Front-End Interface for Automotive Audio Amplifiers

“…For the sake of verifying the performance of the proposed combined boost converter, the other three converters published in [11,19,24] are used for comparison here, as shown in Table 6. It can be For the sake of verifying the performance of the proposed combined boost converter, the other three converters published in [11,19,24] are used for comparison here, as shown in Table 6. It can be For the sake of verifying the performance of the proposed combined boost converter, the other three converters published in [11,19,24] are used for comparison here, as shown in Table 6.…”

“…It can be For the sake of verifying the performance of the proposed combined boost converter, the other three converters published in [11,19,24] are used for comparison here, as shown in Table 6. It can be observed that the amounts of passive components in [19] exceed the requirement in the converter. It will lead to an increase in manufacturing costs.…”

“…High boost DC/DC (direct current to direct current) voltage conversions are indispensable in a power electronic interface of certain low-voltage DC-powered electrical devices, including audio amplifiers [1][2][3][4][5][6][7], high intensity discharge (HID) lamps [8][9][10][11][12][13][14], uninterruptible power supplies (UPS) [15][16][17][18][19], and electric vehicle systems [20][21][22][23][24][25][26][27][28][29][30][31][32]. For such high voltage gain application, the conventional boost converter have to works for extremely wide duty cycle which increases power consumption and has low reliability problems [32,33].…”

“…In addition, although exceeding duty cycles can be prevented, the input current ripple is large because of its single-phase operation makes the converter not suitable for high current and low ripple applications. In order to further decrease the voltage stress on active switches and electromagnetic interference (EMI), Lai presented a high boost converter consisting of three-phase circuits by an auxiliary forward circuit [19]. However, the circuit structure of this particular topology is costly and complex.…”

A single-phase on-line UPS system for multiple load transformers

“…An uninterruptible power supply (UPS) system is an essential equipment for sensitive load applications to maintain the power during outages and meet under and over utility voltage conditions [1,2]. Based on their configuration and operating principle, UPS systems are categorized into three major types: 1) offline, 2) line-interactive, and 3) on-line [3,4].…”