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PortugalElectric Bicycle
Overview
Electric bicycles (E-bikes) combine batteries, motors, and controllers to deliver clean and efficient mobility. Power semiconductors play a critical role in traction, charging, and auxiliary power management, ensuring high efficiency, long range, and system reliability.
System Architecture
Battery Pack: Provides 36V/48V/72V supply, managed by a BMS for protection and balancing.
Traction Inverter: Converts DC to three-phase AC for BLDC or PMSM motors, enabling smooth drive control and regenerative braking.
On-Board Charger: AC-DC with PFC and LLC topologies, optimized for high efficiency and safe charging.
Auxiliary DC/DC: Supplies low-voltage rails (12V/5V) for lighting, displays, and control systems.
Recommended Power Devices
SiC MOSFETs: Enable higher switching frequency and lower conduction losses, improving energy efficiency and thermal performance.
IGBT Modules: Suitable for mid-to-high power traction systems, providing robust operation and cost efficiency.
Low-RDS(on) MOSFETs: Ideal for battery protection, synchronous rectification, and auxiliary DC/DC conversion.
Integrated Power Modules: Combine power switches, drivers, and thermal design into compact packages for high power density and easy assembly.
Key Performance Features
System Voltage: 48V to 72V battery platforms
Drive Stage: Three-phase inverter with FOC or six-step control, regenerative braking supported
Charging: PFC + LLC with synchronous rectification, peak efficiency up to ~94%
Discharge Efficiency: System-level efficiency ~93% with optimized device selection
Cooling: Natural or forced-air cooling, compact design for urban and off-road e-bikes
Design Considerations
Choose device ratings with sufficient voltage/current margins (650V/1200V classes for SiC MOSFETs and IGBTs).
Implement robust gate drive design with short-circuit and overcurrent protection.
Optimize thermal management using heat sinks and high-performance substrates.
Ensure EMI/EMC compliance through proper layout, filtering, and shielding.
Why Baoquan Zhijie
Baoquan Zhijie provides a comprehensive portfolio of SiC MOSFETs, IGBTs, low-RDS(on) MOSFETs, and power modules tailored for electric bicycle applications. Our solutions enable manufacturers to achieve higher efficiency, longer range, compact system design, and improved overall reliability.
