e-Prime: Advances in Electrical Engineering, Electronics and Energy (Sep 2023)
Fast Current Control Based on Indirect Current Sensing of The Full-Bridge Converter Associated with An Electromagnetic Micro-Actuator
Abstract
This paper deals with the fast current control of the full-bridge converter loaded with a digital electromagnetic micro-actuator. Input current sensing method is proposed for the initial full-wave control of output current. Input current analysis takes parasitic parameters into account and shows that input current approximately equals output current during the full-wave state. The peak value of input current during steady state is twice the output current. A multi-scale closed-loop control is then implemented, which ensures stable fast current control. In the micro-actuator application, converters are tightly integrated with micro-actuator at output side. Input shunt sensor is easier to implement and has lower power dissipation compared with output shunt sensor. This solution has been validated with an experimental test bench. FPGA board is used to implement the proposed control strategy. Experimental results show that the start-up duration is greatly reduced, thereby realizing the fast current response.
