Article

Bi-directional charging for efficient energy management

Bi-directional charging enables the flow of energy from the vehicle back to the grid or a home. This technology unlocks the potential for EVs to serve as mobile energy storage units, contributing to grid stability and enabling efficient energy management.

Mobility
Infrastructure
Article

Jul 03, 2025

Smart charging for e-cars at home

As we drive towards a more sustainable future, electric vehicles (EVs) are becoming an increasingly popular choice for environmentally conscious consumers. But with the rise of EVs comes the challenge of charging them efficiently and conveniently at home.

Wouldn't it be great to have a seamless and efficient charging experience for electric cars at home? With a solution that is both compact and convenient. Imagine being able to charge an electric car while simultaneously powering an e-bike, e-scooter, washing machine, and other home appliances and devices.

Turning electric vehicles into energy storage systems

Bi-directional charging
Bi-directional charging
Bi-directional charging

Two-way or bi-directional charging of electric vehicles provides a huge opportunity to turn electric vehicles into an additional energy storage system and save excess electricity, making it available when needed. This way, the battery of an electric car can be used as an energy supply for other devices. The technology enables batteries to be both charged and discharged, which is an important and innovative aspect of smart DC charging. For residential solutions using solar power, it will increase drivers’ independence and further help stabilize smart grids. The power can flow in two directions to cover different use cases, such as bridging power shortages, as a buffer for the private households and even reselling power to the grid with a Vehicle-to-Grid (V2G) option in the future. This means that this charging technology for e-cars makes it possible to feed unused energy from the battery back into the power grid. The vehicle’s battery then works like a very large power bank.

Three-in-one system for bi-directional charging

Infineon’s solutions for bidirectional charging make it possible for electric car users to charge with solar power at home at low cost and use their vehicle as a buffer storage system at the same time. To enable this, Infineon has partnered with a collaborator to develop a three-in-one system of power supply and energy management solutions. The system integrates a solar unit, home storage and a charging station. Thanks to bi-directional inverters, the car now also becomes a buffer storage unit or the home’s backup power supply. Looking ahead, bi-directional energy flows will make it possible to realize further Vehicle-to-Home (V2H) and Vehicle-to-Grid (V2G) solutions.

How to ev charge
How to ev charge
How to ev charge

*Enable to set charging only by using remaining power of solar power generation.

How to charge from ev
How to charge from ev
How to charge from ev

Use case

Infineon GaN solution enables new V2X charging systems by OMRON

Onron charging
Onron charging
Onron charging

Conventional home charging systems are often bulky, inefficient, and limited in their capabilities. In collaboration with Infineon, the Japanese company OMRON Social Solutions Ltd. developed the KPEP-A series. This game-changing technology combines Infineon's CoolGaN™ technology with a unique control technology, enabling bidirectional V2X charging and discharging between renewable energy sources, the grid, and an e-car's battery.

The KPEP-A series is one of the smallest and lightest[1] multi-V2X systems in Japan with a 60% reduction in size and weight compared to similar conventional charger and discharger designs yet providing a charging capability of 6 kW. With the integration of Infineon’s CoolGaN™ solution, the power efficiency of the V2X systems has increased by more than 10% at light load and around 4% at rated load. By improving efficiency and a reduction in size and weight, the new system allows easier installation and maintenance while enabling more elegant designs and offering a wider range of options for installation locations.

Infineon's CoolGaN™ technology, based on gallium nitride (GaN), offers higher power efficiency, a smaller size, and lower weight compared with traditional silicon-based solutions. This technology enables the development of more efficient and compact power systems, such as the KPEP-A series

[1] As of December 2022, based on OMRON’s in-house research on product information disclosed by power conditioner manufacturers for EVs and PHEVs

V2X charging systems for a more sustainable future

V2X charging systems have far-reaching benefits for home energy systems, enabling homeowners to optimize their energy usage and reduce their carbon footprint. By transforming the way we think about energy usage and storage, this technology has the potential to play a key role in creating a more sustainable future.
In the context of advancing technology's impact on various industries, Infineon's innovative GaN technology is poised to revolutionize the future of charging. With its ability to enable faster charging speeds, higher power densities, and more compact designs, GaN technology is set to transform the charging landscape. Get ready to experience the future of electric mobility!