Analytical calculation of resonant inductance for zero voltage switching in phase-shifted full-bridge converters
Analytical calculation of resonant inductance for zero voltage switching in phase-shifted full-bridge converters
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DOI：
10.1049/iet-pel.2012.0461
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发表时间：
2013-03
影响因子：
2
通讯作者：
M. Hallworth;B. Potter;S. Shirsavar
中科院分区：
文献类型：
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作者：
M. Hallworth;B. Potter;S. Shirsavar
相移全桥（PSFB）转换器通过零电压开关（ZVS）实现高频下的高效功率转换；在开关被选通之前，金属氧化物半导体场效应晶体管的寄生漏极至源极电容通过谐振电感进行放电，从而导致导通开关损耗接近于零。通常，变压器的漏电感中会添加一个额外的电感，以形成对 PSFB 转换器的寄生电容进行充电和放电所需的谐振电感。然而，许多 PSFB 模型在选择实现 ZVS 所需的谐振电感时并未考虑磁化电感或死区时间的影响。谐振电感的选择对于 PSFB 转换器的 ZVS 操作至关重要。谐振电感尺寸不正确将无法实现 ZVS 或限制转换器的负载调节能力。这项研究提出了一个独特而准确的方程，用于计算在宽负载范围内实现 ZVS 所需的谐振电感，并考虑了磁化电感和死区时间的影响。导出的方程根据 PSFB 转换器的 PSPICE 仿真和大量硬件实验进行了验证。
The phase-shift full-bridge (PSFB) converter allows high-efficiency power conversion at high frequencies through zero voltage switching (ZVS); the parasitic drain-to-source capacitance of the metal-oxide semiconductor field-effect transistor is discharged by a resonant inductance before the switch is gated resulting in near zero turn-on switching losses. Typically, an extra inductance is added to the leakage inductance of a transformer to form the resonant inductance necessary to charge and discharge the parasitic capacitances of the PSFB converter. However, many PSFB models do not consider the effects of the magnetising inductance or dead-time in selecting the resonant inductance required to achieve ZVS. The choice of resonant inductance is crucial to the ZVS operation of the PSFB converter. Incorrectly sized resonant inductance will not achieve ZVS or will limit the load regulation ability of the converter. This study presents a unique and accurate equation for calculating the resonant inductance required to achieve ZVS over a wide load range incorporating the effects of the magnetising inductance and dead-time. The derived equations are validated against PSPICE simulations of a PSFB converter and extensive hardware experimentations.