Abstract
When the fuel cell (FC) is being activated before used in industrial applications, a power conditioner is needed to interface the FC with the load. Due to low current ripples, high output power, and simple structure, the multi-phase interleaved non-isolated DC-DC converter is most suitable for the power conditioner. This paper proposed, analyzed and designed a four-phase interleaved buck-boost converter with changed load connection (CLC-FIBC) for the FC activation with characteristics as simple structure, wide input current, high current, and low current ripples. The operating principle and mathematical model of the CLC-FIBC were firstly analyzed, derived and presented, and then mathematical equations of transistor voltage stress and inductor current ripple are derived respectively. Besides, this CLC-FIBC was compared with several DC-DC converters to prove the superiority. The simulation and experimental prototype was built to validate the theoretical analysis after presenting some design considerations. Simulation and experimental results show that the CLC-FIBC has characteristics of both step up/down function, high power, wide input current range, and low current ripples.
Highlights
The fuel cell (FC) is usually used in microgrid, fuel cell vehicles (FCVs), and aerospace [1]–[4]
CONTROL STRATEGY Since the proposed CLC-four-phase interleaved boost converter (FIBC) is used for the FC power conditioner with the high-power and wide input current demand, a suitable control strategy is important to obtain both the wide current input range and the fast load transient response when the load varies
The proposed CLC-FIBC has a floating load, and we control this converter as a boost converter
Summary
The fuel cell (FC) is usually used in microgrid, fuel cell vehicles (FCVs), and aerospace [1]–[4]. D. Wang et al.: Four-Phase Interleaved Buck-Boost Converter With Changed Load Connection technology can increase the input power, reduce the input current ripple and the current stress of the switching devices [8], [14]–[19]. The new CLC-FIBC uses four-phase interleaved strategy to increase the input power This CLC-FIBC changes the connection location of the load to obtain wide input current range, both step-up and step-down functions, and transistor common ground configuration, which will simplify drive design of power transistor in the multi-phase parallel application. The main circuit topology of the CLC-FIBC (Figure 1(c)) follows four identical parallel connections of the CLC-SBC to feed power to the load and reduce the input current ripple.
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