Paralleling magamp-postregulator modules with sliding-mode-control method

Abstract

This paper presents the parallel application of the magnetic amplifier (magamp) postregulators with a sliding-mode control. The system can be robust and with fast dynamic response based on the sliding-mode control. The controller can be designed in the time domain directly, which makes the design strategy easier and realizable. When the load increases, the parallel operation is adequate to be adopted. With the sliding-mode control and proper current distribution, the output currents of the parallel modules can be same when the capacity of the individual module is equal. Even if the capacities of the modules are different, the module with more capacity can also provide more output current and work well. Therefore, the purposes of controlling the output current distribution and achieving the stability of output voltage based on this kind of control strategy are achieved. Simulations and experimental results show that the parallel modules of magamp postregulators with the sliding-mode control can obtain the well dynamic behavior and proper current distribution.