Electric Vehicle Supply Equipment (EVSE)
Electric vehicle supply equipment (EVSE), commonly called charging stations or charging docks, have three to four main sub-systems depending on the type of equipment, each requiring EMI protection from other sub-systems. Filtering, shielding and improved PCB layout are a means of reducing EMI, but these techniques can be costly and consume extra space. Reducing the noise generated by the clock is a fast and less costly approach. SiTime MEMS products offer such noise reduction benefits.
- Level 1 and 2 chargers (AC chargers) have subsystems for AC-DC conversion, HMI and system monitoring at a minimum.
- Level 3 charger (DC chargers) have an additional sub-system for DC-DC conversion.
- Battery buffered charging stations allow for the batteries in the EVSE to be charged during off peak hours helping defray the high recurring cost of using electricity during peak hours. Instead of use a DC-DC sub-system, these chargers require a battery management system (BMS) to monitor the health of the batteries and will benefit from SiTime SiT8021 or SiT9025 oscillators.