Abstract：High-precision power converters are core components of ultra-precision motor motion control

systems.Their output current harmonic distortion can cause unnecessary positioning fluctuations in ultra-precision

motors，severely impacting the precision control system.Total harmonic distortion is an important index in highperformance precision control fields. A class of dual-buck topologies with no dead-time characteristics can

eliminate the current distortion caused by dead-time in traditional bridge topologiesoutput high-quality，stable waveforms. To further improve the output current harmonic distortion of a class of dual-buck topologies，the

sources of harmonic distortion in a class of dual-buck topologies were first clarified.For the harmonic distortion

issues introduced by the power conversion stagecontrol system of a class of dual-buck topologies，the

characteristics of low harmonic distortion a class of dual-buck topologies were summarized. The mechanisms of

suppressing harmonic distortion by different control methods were revealed，and the relationship between various

modulation strategiesharmonic distortion was studied. Finally，specific application scenarios for low-distortion

a class of dual-buck converters were summarized，and reference directions for their future development were

provided.

      Key words：low harmonic distortion；power converter；high-precision a class of dual-buck topologies；low

distortion control methods；hybrid modulation strategies