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Soft-switching operation of the dual-interleaved boost converter over all duty ratios

机译:双交错升压转换器在所有占空比上的软开关操作

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To extend the operating range of the snubber assisted zero-voltage and zero-current transition dual-interleaved boost converter beyond its inherent soft-switching limit of = 0.5, a resonant pulse transformer is proposed instead of the resonant inductor. The 1 : 2 turns ratio of the transformer ensures full discharge of the snubber capacitor at all duty ratio values to facilitate zero-voltage zero-current switching at turn on of the main switching devices. The effectiveness of the topology has been confirmed by SPICE simulation and demonstrated by a 20 kW SiC metal-oxide-semiconductor field-effect transistor converter. The prototype operated at 20 kW, 112 kHz, 320-600 V achieving 98.7% efficiency and achieved 98.2% efficiency at 6 kW. Taking the additional losses in the auxiliary circuit into account, the switching losses at 20 kW are reduced by 74% compared with hard-switching operation, representing a 54% reduction in overall losses.
机译:为了将缓冲器辅助的零电压和零电流转换双交错升压转换器的工作范围扩展到其固有的软开关极限= 0.5以上,提出了一种谐振脉冲变压器来代替谐振电感器。变压器的1:2匝数比可确保在所有占空比值下缓冲电容器都完全放电,从而有助于在主开关器件导通时实现零电压零电流开关。拓扑的有效性已通过SPICE仿真得到证实,并通过20 kW SiC金属氧化物半导体场效应晶体管转换器进行了演示。该原型在20 kW,112 kHz,320-600 V的电压下运行,可实现98.7%的效率,而在6 kW下可实现98.2%的效率。考虑到辅助电路中的额外损耗,与硬开关操作相比,20 kW时的开关损耗降低了74%,总损耗降低了54%。

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