More than 600 switch mode power converters are installed in LEP (Large Electron Positron colliding beam accelerator) to power the main ring magnet system. The horizontal and vertical magnets are fed by 520 bipolar, four-quadrant units of 675-W output rating. The short chains of quadrupole and sextupole magnets with copper windings are powered by 105 modular resonant-type power converters of a DC output rating of 3.75 kW. Their transformer-coupled output stage makes it possible to choose three different output ratings, i.e. 300 A/125 V, 200 A/188 V, and 150 A/250 V. Eight high-current 2000-A, 10-V converters feed the superconducting quadrupoles for the low- beta insertions in the physics interaction regions. Details are given on the initial CERN design work leading to the choice of circuit topology, in order to meet the strict accelerator requirements, particularly on efficiency, size, and reliability.
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机译：LEP（大电子正电子碰撞电子束加速器）中安装了600多个开关模式功率转换器，用于为主环形磁体系统供电。水平和垂直磁体由520W额定输出功率的520个双极四象限单元供电。带有铜绕组的四极和六极磁体的短链由105个模块化谐振型功率转换器提供动力，其直流输出额定值为3.75 kW。它们的变压器耦合输出级使得可以选择三个不同的输出额定值，即300 A / 125 V，200 A / 188 V和150 A / 250V。八个高电流2000-A，10-V转换器为物理相互作用区域中低β插入的超导四极子。为了满足严格的加速器要求，特别是效率，尺寸和可靠性方面的要求，详细介绍了导致电路拓扑选择的CERN初始设计工作。
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