direct current-direct current DC-DC converter
direct-current direct-current converter
dual current closed loop
Dual closed-loop speed contrd system
dual closed-loop system
position and speed dual-closed loop
speed closed loop system
alternating current-direct current
asymmetric alternating current-direct current powe
asymmetric alternating current-direct current power supply
CT Direct Current Speed Governing System
digit direct current speed regulator
direct current speed adjustment
direct current speed regulating
direct current speed regulation
Direct-current Speed Governing System
Earth Judgment of Direct Current System