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吸收电路总损耗是牵引传动装置，尤其是大功率逆变器和PWM（脉宽调制）变流器的主要设计依据之一。在大功率等级上，因设计和组装的要求，使得吸收电路过多的损耗成为系统设计人员要解决的一个主要难题。对于工作在直流750V或1．5kV下的GTO装置，在常用的约500Hz开关频率条件下，吸收电路的损耗通常不会达到极限状态。本文讨论的是直流电压为2．4～2．8kV、容量约为2．5MVA的大功率牵引传动装置中的新型能量回收吸收电路。这种电路是所谓非对称低损耗吸收电路的发展，其吸收电路大部分能量要回收到直流电源中去。本文内容包括基于计算机仿真的电路设计以及从试验型逆变器取得的试验结果。
Absorption circuit total loss is one of the main design references for traction drives, especially high-power inverters and PWM (pulse width modulation) converters. At high power levels, the excessive loss of snubber circuits becomes a major challenge for system designers due to design and assembly requirements. For GTO devices operating at 750V or 1.5kV DC, the loss of the snubber circuit typically does not reach its limit state at the commonly used switching frequency of about 500Hz. This article discusses a new type of energy recovery sink circuit in a high power traction drive with a DC voltage of 2.4-2.8 kV and a capacity of about 2.5 MVA. This circuit is the so-called asymmetric low-loss absorption circuit development, the absorption circuit most of the energy to be recycled to the DC power. This article includes circuit design based on computer simulation and experimental results from a pilot inverter.