基于负载自适应的辅助LC网络宽范围零电压开通的输入串联输出并联移相全桥DC-DC变换器
Loads Adaptive Input-series-output-parallel Phase Shift Full Bridge Derived DC-DC Converters With Auxiliary LC Networks to Achieve Wide Zero Voltage Switching Range
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摘要: 提出一种由2个移相全桥(phase-shifting full-bridge,PSFB)变换器模块和2个辅助LC网络组成的输入串联输出并联的DC-DC变换器。每一个LC网络连接在一个模块超前桥臂的中点和另一个模块滞后桥臂的中点之间。利用辅助LC网络,滞后桥臂开关管可以实现轻载下的零电压开通(zero voltage switching,ZVS),辅助LC网络的电流幅值可以自适应负载变化,即轻载时电流幅值大,用于实现滞后桥臂软开关管能量多,重载时,LC网络电流幅值小,环流损失小。因此,所提变换器适用于宽范围负载。对变换器的特点进行分析,并通过一个功率900W的原理样机验证了所提变换器的性能。Abstract: An input-series-output-parallel（ISOP） two phase shift full bridge DC-DC converters with two auxiliary LC networks was proposed. Each LC network is connected between the leading-leg mid-point of a module and the lagging-leg mid-point of the other one. With the aid of the LC networks even at light loads, ZVS for lagging-leg switches can be achieved, and the current amplitude of LC networks are load adaptive. i.e., at light loads, the energy used to achieve soft switching for lagging leg switches increases and the circulating current and its loss is reduced. Thus, it is very suitable for wide load range. The feature of the converter is analyzed. The performance of the proposed converter is verified by a 900 W experimental prototype.
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