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首页> 外文期刊>Power Electronics, IEEE Transactions on >Variable-Switching-Frequency State-Feedback Control of a Phase-Shifted Full-Bridge DC/DC Converter
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Variable-Switching-Frequency State-Feedback Control of a Phase-Shifted Full-Bridge DC/DC Converter

机译:移相全桥DC / DC转换器的可变开关频率状态反馈控制

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摘要

This paper presents a methodology to control a phase-shifted full-bridge (PSFB) dc/dc converter with variable switching frequency, as a function of the output load power. The main objective of such control is to maximize the conversion efficiency at a wide range of load power levels. By tuning the switching frequency, the net phase of the input impedance of the converter can be manipulated, and thus, at the lower load power operation, the net input impedance can be made highly inductive to achieve zero-voltage switching (ZVS) at the primary-side switches. This paper proposes an efficiency maximization method, which derives an optimum switching frequency based on the load power from a loss-minimization model. In addition, a state-feedback-based control method is proposed for maintaining a tight dynamic regulation over the converter output under a load transient. A 6-kW laboratory prototype of the PSFB converter is developed and designed to validate the proposed control algorithm. The experimental results show a conversion efficiency of 98% at full load and output voltage ripple of ±1%, while ensuring ZVS at all operating points between 100 W and 6 kW.
机译:本文提出了一种根据输出负载功率来控制具有可变开关频率的移相全桥(PSFB)dc / dc转换器的方法。这种控制的主要目的是在很宽的负载功率范围内最大化转换效率。通过调整开关频率,可以控制转换器输入阻抗的净相位,因此,在较低负载功率操作下,可以使净输入阻抗具有高感性,以实现零电压开关(ZVS)。初级侧开关。本文提出了一种效率最大化的方法,该方法根据损耗最小化模型的负载功率得出最佳开关频率。此外,提出了一种基于状态反馈的控制方法,以在负载瞬态情况下保持对转换器输出的严格动态调节。开发并设计了一个6 kW PSFB转换器的实验室原型,以验证所提出的控制算法。实验结果表明,在满载条件下的转换效率为98%,输出电压纹波为±1%,同时确保100 W至6 kW之间的所有工作点的ZVS。

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