SBAA541 December 2022 AMC1202 , AMC1302 , AMC1306M05 , AMC22C11 , AMC22C12 , AMC23C10 , AMC23C11 , AMC23C12 , AMC23C14 , AMC23C15 , AMC3302 , AMC3306M05
The control loops regulation performances of the power conversion system in DC charging stations are significantly impacted by current-sensor parameters such bandwidth, gain, and offset error.
This application note defined system simulations of AC/DC and DC/DC, correspondingly, with the minimum requirements of current sensors based on the different features. The results in this document illustrate that in DC charging stations, shunt-based designs can match and even present higher performances in all the measurement points by having low power consumption. Challenges for the shunt-based current sensing were found in the switching node of the DC/DC converter when low-latency zero-crossing current detection needs to be achieved. An alternative method for detecting the zero crossing of the current was proposed.
In conclusion, the methodology applied in this application note is not valid only for an 11-kW system but can be scaled up to higher power, leading to a proper guideline in the selection of current sensors.