Targeted solutions for e-mobility’s five critical subsystems
KEY TAKEAWAYS:
- E-mobility is a system-level design challenge
- The interplay between subsystems is critical
- Focusing on the user experience drives better design choices
E-mobility design is no longer about selecting a single microcontroller, MOSFET, battery monitor or wireless device. Whether the end-product is an e-bike, e-scooter, electric two-wheeler, three-wheeler or larger mobility platform, OEMs are trying to solve a set of tightly connected system challenges: extending range, reducing charging time, lowering cost, managing heat and maintaining reliability over the operating life of the vehicle.
Improving one area can create pressure elsewhere. Faster charging can increase thermal stress; longer range can add battery cost and weight; reducing the bill of materials must not compromise safety. This is where a system-level approach to e-mobility is especially relevant. Rather than discrete components, suppliers now strategically target the main functional blocks inside the vehicle at a system level: power conversion, battery management, motor control, vehicle control and connected intelligence.
We see this in the way Renesas is bringing technologies together as validated application architectures, supported by block diagrams, reference designs, software examples and development resources. For engineering teams, this creates a faster route from concept to evaluation.
Renesas has targeted solutions for the common challenges found in e-mobility design optimization (Source: Renesas)
Efficiency frames range and charging
Power conversion sits at the center of many e-mobility design trade-offs. Every watt lost in conversion becomes heat; increasing thermal management requirements, reducing power density and limiting vehicle performance. Renesas addresses this area with a combination of power management devices, MOSFETs, GaN power devices, gate drivers, sensing, protection and control processors. The addition of GaN capability strengthens the portfolio for high-density, lower-loss designs where space and efficiency are critical.
Typical power-conversion opportunities include AC-DC charging from the grid to the battery, USB-C and USB Power Delivery for portable batteries, DC-DC conversion between 48 V and 12 V rails, and GaN-based power stages for applications that demand higher power density. Renesas reference designs include a 500 W onboard charger for two-wheeler charging applications and bidirectional 12 V/48 V DC-DC platforms that support efficient power transfer between vehicle voltage domains. Another reference design for a MOSFET-based bidirectional converter delivers more than 3 kW at over 95% efficiency while supporting functional-safety requirements. These designs help OEMs reduce implementation complexity and address emerging 48 V architectures.
Renesas also addresses intelligent power distribution, with protection, diagnostics and current monitoring that can replace or support conventional fuses and relays. Software-based e-fuse functionality, implemented through current-sense feedback to the MCU, gives designers greater visibility into abnormal load conditions and supports more serviceable, software-defined vehicle architectures.
Battery management and protection
The battery is one of the most expensive and safety-critical parts of any e-mobility platform. OEMs need accurate state-of-charge and state-of-health information, reliable protection mechanisms, cell balancing, fault detection and long-term pack monitoring. Renesas supports this chain with battery management ICs, fuel-gauge ICs, precision sensing, protection devices, diagnostics and automotive MCUs.
In an automotive battery management system, an MCU communicates with multi-cell lithium-ion battery management devices to monitor cell voltage, temperature and current, to detect faults and control cell balancing. Renesas’ architecture combines the MCU, battery management devices, software support and protection infrastructure into a complete evaluation path.
The solution scales across different battery requirements, from small packs to larger multi-cell systems, with development kits, firmware and ecosystem support designed to help quick engineering evaluation.
Motor control for smooth, efficient motion
Motor control determines how an e-mobility platform feels in use. Acceleration, torque response, ride quality, regenerative braking and overall efficiency all depend on the way power is delivered to the motor. Good motor control can improve range without increasing battery size, while also creating a smoother and more responsive user experience.
Renesas brings together automotive MCUs, sensing, gate drivers, MOSFET power stages and control algorithms to support compact, efficient motor-drive designs. Its BLDC motor control solution targets applications such as e-bikes and e-scooters, where OEMs need a smaller PCB, integrated three-phase smart gate drivers and faster time to market.
For traction applications, the low-voltage inverter reference design for two- and three-wheelers uses the RH850 family, supported by gate drivers, MOSFETs, power management and position sensing. The platform supports motors up to 10 kW and gives customers hardware and software examples for rapid evaluation.
Coordinating the complete e-mobility platform
If the battery system protects the pack and the inverter controls the motor, the vehicle control unit is the brain that coordinates the wider platform. It manages propulsion, charging, diagnostics, communication and decisions across the vehicle. As architectures move toward more software-defined and zonal approaches, the VCU becomes more important because it must connect and supervise multiple subsystems while leaving room for future feature growth.
Renesas positions its VCU around the RH850/U2A MCU, supported by CAN, LIN and Ethernet interfaces for communication with the battery system, motor controller, display, telematics and other electronic units. The wider solution brings together MCUs, power management and connectivity into a single vehicle platform for two-wheelers, three-wheelers and four-wheelers. Renesas also highlights integrated “X-in-one” platforms, including 96 V EV units that consolidate traction inverter, onboard charging, DC-DC conversion and vehicle control. By reducing separate modules, wiring, weight and assembly complexity, this approach can help OEMs lower system cost while increasing integration.
Connected intelligence differentiates rider experiences
Once the core vehicle functions are in place, OEMs increasingly look for differentiation through the rider interface and connected services. Modern e-bikes and scooters are expected to offer more than speed and battery-state information. Digital clusters can support navigation, diagnostics, media, smartphone pairing, service data, remote lock and unlock, and over-the-air connected features.
Renesas’ connected intelligence solutions combine processing, graphics, Bluetooth, Wi-Fi, power management, sensor interfaces and wireless connectivity to create compact cluster and control platforms. This shifts the conversation from core propulsion to user experience. For mass-market e-mobility, the value is a premium interface at an achievable cost, with rugged operation suitable for heat, dust and vibration. For engineering teams, it provides a proven starting point for smarter, more connected vehicle designs.
Avnet’s e-mobility-as-a-system approach
Through its supplier partners, Avnet can support the vehicle as a system. In an e-bike architecture, for example, solutions from Renesas can appear in the charger, battery pack, control unit, inverter, motor control stage and display. The same system-level thinking applies across two-wheelers, three-wheelers, electric motorcycles and broader mobility platforms.
This approach targets OEMs looking to shorten development cycles and reduce risk. Reference designs provide schematics, software, design files and validated architectures that help engineering teams move quickly from evaluation to implementation. For OEMs, the result is a clearer route to scalable, reliable and differentiated e-mobility products.
