With the growing awareness of environmental protection and the acceleration of urbanization, e-bikes have gradually evolved from simple transportation tools into high-tech products integrating intelligence and networking.
I. As e-bikes become increasingly intelligent, why is circuit protection becoming more and more important?
Smart meters, app connectivity, BMS battery management systems, CAN communication, MCU central controllers, sensor monitoring, intelligent algorithm control… more and more electronic functions are being integrated into the e-bike system, making the riding experience smarter, safer, and more convenient.
However, behind this intelligent upgrade lies new challenges—a significant increase in electrical risks.
II. E-bike Electrical Architecture
The electrical architecture of e-bikes is highly integrated, mainly composed of a battery management system (BMS), a controller (MCU), a motor drive (MOSFET/BLDC), a human-machine interface (screen/CAN bus), and a power conversion module (DC/DC). Electrical interference in any of these components can lead to system failure or even safety accidents.
III. Common Electrical Risks of E-bikes and Semiware Protection
1️⃣ CAN Communication Interface Risks
Many smart E-bikes use the CAN bus to achieve data communication between modules such as the BMS, MCU, and instruments.
However, the CAN interface usually connects to long wiring harnesses, making it susceptible to:
- ESD (Electrostatic Discharge)
- Surge impact
- Electromagnetic interference (EMI)
- Transient overvoltage
Insufficient protection can lead to communication abnormalities, data loss, and even control system failure.
Semiware Recommended Solution: SE23T20B24LB | TVS Diode Array
2️⃣ DC/DC Converter: The "Voltage Regulator" Line of Defense at the Power Supply End
E-bikes typically require DC/DC modules for voltage conversion to provide stable power to modules such as the MCU, display, and sensors.
However, the power system often faces:
- Transient impact from battery insertion and removal
- Voltage fluctuations during motor startup
- Surges caused by load switching
- Overvoltage risks due to power supply abnormalities
Therefore, high-power TVS diodes need to be placed at the power input to "absorb" this energy.
Semiware offers several high-reliability options:
- SVC500B60 / SVC500B64: 5000W power, providing precise clamping protection for systems around 60V and 64V respectively.
2. SVC500B75 (5.0SMDJ75CA): 5000W high power, providing clamping protection up to 92.1V.
Besides the interface and power supply, the power MOSFETs (responsible for the high-current switching of the motor) and MCU (responsible for system control) in the E-bike are also vulnerable.
👉 View complete protection solutions: https://en.semiware.com/applications/e-bike/
Semiware has over 15 years of EMC protection experience, accumulating rich practical application experience in TVS diodes, ESD protection arrays, surge protection devices, and power devices, providing more complete and reliable circuit protection support for E-bikes.
If you are developing E-bikes, electric two-wheelers, or smart mobility devices and require circuit protection solutions, please contact us. We can help you build a more stable and reliable electronic system.
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