A 400 Hz aircraft power generating system which has been designed to achieve significant improvements in power density and reliability is introduced. Design targets for this exploratory development program include system (generator-plus-converter) power density of 1 kVA/lb and mean-time-between-failure (MTBF) of 500 h. At the heart of the new variable-speed constant-frequency (VSCF) configuration is a high-frequency resonant link inverter designed so that all inverter switching occurs under zero-voltage conditions. Advantages include minimization of switching losses and significant reductions in power device switching stresses and electromagnetic interference (EMI) generation. Inverter losses are further reduced by using MOS-controlled thyristors (MCTs) as the power switches in order to take advantage of their low forward voltage. A 60 kVA breadboard version of the system has been constructed, and test results which confirm its key performance characteristics are presented.
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机译：介绍了旨在显着提高功率密度和可靠性的400 Hz飞机发电系统。该探索性开发计划的设计目标包括1 kVA / lb的系统（发电机加转换器）功率密度和500 h的平均故障间隔时间（MTBF）。新变速恒频（VSCF）配置的核心是高频谐振链路逆变器，其设计使得所有逆变器切换都在零电压条件下进行。优点包括最大程度地减少开关损耗，并显着降低功率器件的开关应力和电磁干扰（EMI）的产生。通过使用MOS控制晶闸管（MCT）作为电源开关，可进一步降低逆变器损耗，以利用其低正向电压。已经构建了该系统的60 kVA面包板版本，并给出了确认其关键性能特征的测试结果。
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