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首页> 外文会议>2013 Abstracts IEEE International Conference on Plasma Science >Optimal design of a modular 11kW serial parallel resonant converter for a solid state 115-kV long pulse modulator
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Optimal design of a modular 11kW serial parallel resonant converter for a solid state 115-kV long pulse modulator

机译：固态115 kV长脉冲调制器的模块化11kW串联并联谐振转换器的优化设计

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Modern accelerator driven experiments like linear colliders or spallation sources are supplied by RF amplifiers using klystrons. The cathode voltage for these klystrons can be generated by long pulse modulators generating highly accurate voltage pulses in the length of milliseconds. Common designs like Bouncer Modulator topologies using pulse transformers become huge for long pulses. The series parallel resonant converter (SPRC) is a modular topology which avoids this drawback as the transformer is operated at high frequencies. In the considered application, the required nominal pulse voltage amplitude is 115kV with a pulse power of 2.88MW and a pulse length of 2.8ms. The pulse to pulse reproducibility of 0.02% and a voltage ripple at top of less than 0.05% are highly demanding. Additionally, the energy delivered to the load in case of an arcing klystron should not exceed 10J and the time of the converter should exceed 109 pulses. In order to meet these highly demanding specifications, the modulator is based on interleaved SPRC modules. Because of the high number of degrees of freedom as geometric parameters of the transformer, number of parallel semiconductors, design of the resonant tank the optimization procedure presented in [1] has been developed for designing the modulator. A SPRC module contains a full bridge connected to a series parallel circuit followed by a transformer a rectifier and a filter capacitor. In this paper, an optimal design of a single module according to the design considerations in [1] which are based on an electrical model of the inverter, a magnetic, a thermal and an isolation model of the transformer is presented and the design trade-offs/alternatives are discussed in detail. For validation of the models and the optimization procedure, a prototype of a single module has been built and is tested under full load conditions. There the focus is on evaluating the thermal behaviour of the transformer and the isolation of the transf- rmer, which is especially crucial for a series connection of the modules. In order to meet the highly demanding requirements on the ripple and the reproducibility, a comprehensive small signal model based on [2] and control strategy for optimal interleaving of the series connected modules is presented in the paper. This enables to minimize the output voltage ripple and reducing the filtering effort at the same time.
机译：使用速调管的RF放大器提供了现代加速器驱动的实验，例如线性对撞机或散裂源。这些速调管的阴极电压可以通过长脉冲调制器生成，该调制器会在毫秒的长度内生成高度精确的电压脉冲。对于长脉冲，使用脉冲变压器的Bouncer调制器拓扑之类的常见设计变得非常庞大。串联并联谐振转换器（SPRC）是模块化拓扑，可避免此缺点，因为变压器在高频下工作。在考虑的应用中，所需的额定脉冲电压幅度为115kV，脉冲功率为2.88MW，脉冲长度为2.8ms。对脉冲至脉冲的可复制性要求为0.02％，顶部的电压纹波小于0.05％。此外，在产生速调管时，传递给负载的能量不应超过10J，转换器的时间应超过10 9 脉冲。为了满足这些高要求的规范，调制器基于交错式SPRC模块。由于作为变压器几何参数的自由度很高，并联半导体的数量众多，谐振储能电路的设计以及为设计调制器而开发的[1]中介绍的优化程序。 SPRC模块包含一个全桥，该全桥连接到串联并联电路，随后是变压器，整流器和滤波电容器。在本文中，根据[1]中的设计考虑，提出了基于逆变器的电气模型，变压器的磁，热和隔离模型的单个模块的最佳设计，并且设计权衡如下： offs / alternatives被详细讨论。为了验证模型和优化过程，已构建了单个模块的原型，并在满负荷条件下进行了测试。那里的重点是评估变压器的热性能和变压器的隔离，这对于模块的串联特别重要。为了满足对纹波和再现性的高要求，本文提出了一种基于[2]的综合小信号模型和控制策略，以实现对串联模块的最佳交错。这样可以使输出电压纹波最小化，同时减少滤波工作。

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