A High-Frequency Inverter for Variable-Load Operation
A High-Frequency Inverter for Variable-Load Operation
复制标题
用于可变负载操作的高频逆变器
DOI：
10.1109/ecce.2018.8558145
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发表时间：
2018
影响因子：
5.5
通讯作者：
D. Perreault
中科院分区：
文献类型：
--
作者：
Weston D. Braun;D. Perreault
本文提出了一种新的逆变器结构，适用于驱动广泛变化的负载阻抗在高频（HF，3-30 MHz）及以上。我们沿着提出的架构的基础理论和设计考虑，以及物理原型和效率优化控制器。HF可变负载逆变器（HFVLI）架构包括两个具有独立可控的幅度和相位的HF逆变器，这两个HF逆变器连接在一起并且经由无损功率组合网络连接到负载，在此实现为导抗转换器。通过控制两个组成逆变器的幅度和相对相位，即使对于负载阻抗的宽变化，每个组成逆变器所看到的负载也可以保持在期望的范围内。这允许使用高效的零电压开关逆变器，否则这些逆变器在呈现宽阻抗范围的应用（诸如无线功率传输和RF等离子体生成）中将被排除或限制。原型HFVLI系统证明了所提出的方法的好处。它的工作频率为13.56 MHz，可以以95.4%的效率向21.8 + 0.3j负载提供1 kW的最大输出功率，并能够以高功率高效率驱动各种容性和感性负载。
This paper presents a new inverter architecture suitable for driving widely varying load impedances at high frequency (HF, 3–30 MHz) and above. We present the underlying theory and design considerations for the proposed architecture along with a physical prototype and efficiency optimizing controller. The HF variable-load inverter (HFVLI) architecture comprises two HF inverters with independently controllable amplitude and phase connected together and to the load via a lossless power combining network, implemented here as an immittance converter. By controlling the amplitudes and relative phase of the two constituent inverters, the loading seen by each constituent inverter can be kept in a desirable range even for wide variations in load impedance. This allows for the use of highly efficient zero-voltage switching inverters that would otherwise be precluded or limited in applications presenting wide impedance ranges, such as wireless power transfer and RF plasma generation. The prototype HFVLI system demonstrates the benefits of the proposed approach. It operates at 13.56 MHz and can supply a maximum output power of 1 kW into a 21.8 + 0.3j load at an efficiency of 95.4% and is able to drive a wide range of capacitive and inductive loads at high power with high efficiency.