为了降低损耗,提高DC/DC转换器的效率以及工作范围,提出了一种高效率的混合型全桥DC/DC转换器。其由移相全桥串联谐振转换器和带有倍压电路的有源钳位升压转换器组合而成,并使用电路结构简单的混合控制方案。在正常输入范围内,所提出的...为了降低损耗,提高DC/DC转换器的效率以及工作范围,提出了一种高效率的混合型全桥DC/DC转换器。其由移相全桥串联谐振转换器和带有倍压电路的有源钳位升压转换器组合而成,并使用电路结构简单的混合控制方案。在正常输入范围内,所提出的转换器作为相移全桥串联谐振转换器工作,通过在所有开关和整流二极管上应用软开关,并降低传导损耗,从而提高转换效率。当输入低于正常输入范围时,转换器作为有源钳位升压转换器工作,增强了工作范围。由于混合操作,所提出的转换器在正常输入范围下以比常规转换器更大的相移值进行工作。因此,所提出的转换器能够在较宽的工作范围内提供高功率转换效率。最后建立了一个1 k W的原理样机,来验证所提出转换器的有效性。展开更多
By using the output inductors and body capacitances without adding any component compared with hard switching synchronous rectifier,the topology of a soft switched synchronous rectifier with phase-shifted full bridge ...By using the output inductors and body capacitances without adding any component compared with hard switching synchronous rectifier,the topology of a soft switched synchronous rectifier with phase-shifted full bridge zero voltage switching DC/DC converter is proposed. The converter efficiency is maximized due to soft switching of the full bridge MOSFETs and the synchronous MOSFETs, and also the low conduction loss of synchronous MOSFET. The operation principles of the circuit are analyzed in detail and the small-signal model is derived, also the converter dynamic characteristics are analyzed. Frequency responses of transfer functions under different values of transformer primary leakage inductance are discussed. The experimental results were obtained from a 400 V input and 100 A/12 V output DC/DC converter operating at 100 kHz. The results show that the converter efficiency is 2% higher in rated power than traditional diode rectifier.展开更多
文摘为了降低损耗,提高DC/DC转换器的效率以及工作范围,提出了一种高效率的混合型全桥DC/DC转换器。其由移相全桥串联谐振转换器和带有倍压电路的有源钳位升压转换器组合而成,并使用电路结构简单的混合控制方案。在正常输入范围内,所提出的转换器作为相移全桥串联谐振转换器工作,通过在所有开关和整流二极管上应用软开关,并降低传导损耗,从而提高转换效率。当输入低于正常输入范围时,转换器作为有源钳位升压转换器工作,增强了工作范围。由于混合操作,所提出的转换器在正常输入范围下以比常规转换器更大的相移值进行工作。因此,所提出的转换器能够在较宽的工作范围内提供高功率转换效率。最后建立了一个1 k W的原理样机,来验证所提出转换器的有效性。
文摘By using the output inductors and body capacitances without adding any component compared with hard switching synchronous rectifier,the topology of a soft switched synchronous rectifier with phase-shifted full bridge zero voltage switching DC/DC converter is proposed. The converter efficiency is maximized due to soft switching of the full bridge MOSFETs and the synchronous MOSFETs, and also the low conduction loss of synchronous MOSFET. The operation principles of the circuit are analyzed in detail and the small-signal model is derived, also the converter dynamic characteristics are analyzed. Frequency responses of transfer functions under different values of transformer primary leakage inductance are discussed. The experimental results were obtained from a 400 V input and 100 A/12 V output DC/DC converter operating at 100 kHz. The results show that the converter efficiency is 2% higher in rated power than traditional diode rectifier.
