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EV charging - AC and DC wallbox charger

Most electric vehicle charging stations that you find today in home, office, and private parking lots use AC charging. Charging speed depends on the car battery's capacity, power density, and charging power as well as the power available to the charging infrastructure, which is usually limited to 22 kW. DC charging stations, on the other hand, provide much higher charging capacity. Often deployed near highways or at public charging stations, DC charging stations are ideal solutions when you don't have too much time to recharge the car batteries. DC charging is also making its way into home charging stations with charging capacity up to 40KW, also called wallboxes, offering new possibilities for customers since it allows not only fast charging but also bidirectional charging where you can reuse available energy in the car batteries to load home battery storage systems.

Key challenges

In addition to the ease of installation and maintenance of DC charging wallboxes, homes and businesses are looking for the following key features:

  • Compact fixtures with a small form factor and practical design
  • Smart wallbox solutions designed to optimize energy flow and reduce electricity costs
  • Accurate sensing and control of power being supplied directly to the vehicle's battery
  • High-power density solutions to support a wide output voltage range (200 to 1000 V) and flexible charging power sources (22 to 40 kW)
  • Bidirectional charging for vehicle-to-grid (V2G) and vehicle-to-home (V2H) applications

Our products and solutions

To meet the demand for a wide range of AC and DC wallbox chargers, ST offers complete solutions based on STM32 microcontrollers along with fast switching, high-performance power devices including silicon-carbide (SiC) and silicon power MOSFETs, SiC rectifiers and protection devices (TVS), and isolated gate drivers.

ST contributes to the development of high-power-density DC wallbox chargers, with SiC Power Module solutions, and also provides metering devices for real-time energy monitoring and power connections to the grid as well as CAN and Powerline transceivers for connections with electric vehicles.