摘要：【中文】本发明公开了一种应用于磁悬浮轴承的环形拓扑四桥臂控制装置及方法，属于磁悬浮轴承控制领域，包括4个单向导通器件、4个可控开关、4个绕组和电源。改变各个可控开关在一个开关周期内的导通时间控制通过各绕组的电流，通过将4个绕组分为两组，控制绕组中共模电流与差模电流的方式，实现对磁悬浮轴承中控制两个自由度的四个绕组电流的控制。本发明4个绕组环形连接，对于单个八极径向磁轴承的四个绕组只需要四个桥臂进行控制，对普通的桥式电路中单个线圈需要两个桥臂控制的方式，有效提高了器件的利用率。同时本发明提供的控制器在对两个绕组之间的差分电流进行控制时，可实现较高的电压利用率。 【EN】The invention discloses a ring topology four-bridge arm control device and method applied to a magnetic suspension bearing, belongs to the field of magnetic suspension bearing control, and comprises 4 one-way conduction devices, 4 controllable switches, 4 windings and a power supply. The current passing through each winding is controlled by changing the conduction time of each controllable switch in one switching period, and the control of the currents of the four windings for controlling two degrees of freedom in the magnetic suspension bearing is realized by dividing the 4 windings into two groups and controlling the common mode current and the differential mode current in the windings. The invention has the advantages that the 4 windings are annularly connected, only four bridge arms are needed for controlling the four windings of the single octupole radial magnetic bearing, and two bridge arms are needed for controlling a single coil in a common bridge circuit, so that the utilization rate of devices is effectively improved. Meanwhile, when the controller provided by the invention is used for controlling the differential current between the two windings, higher voltage utilization rate can be realized.