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E-Bike

E-Bike Solutions from Texas Instruments

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For position and current if necessary Comparators and shunt signal conditioning if necessary Input Amplifier Input Amplifier Comparators and shunt signal conditioning if necessary Clock Digital Isolators Digital Isolators Digital Isolators Digital Isolators Digital Isolators Digital Isolators AC/DC Converter with Green Mode Controller Backlight Battery Charger Battery Fuel Gauges Battery Protection Mosfet Drivers Core & I/O Power System Power The TMS320F28015 DSP is a highly integrated, high-performance solution for demanding control applications. For a more economical, straight-forward system, we suggest the MSP430 micro controllers. Relay Drivers Temperature Sensor Temperature Sensor

Design Considerations

Electric bikes are becoming an increasingly intriguing option for commuters who live relatively close to work or for those looking for an alternative to the more expensive motorized options.  As battery and motor technology forges ahead, the speed and range of E-bikes are surging with it. The E-bike can use a variety of components based on the desired cost and complexity of the design.

The core subsystems include:

Controller:
Typically includes detection, A/D conversion, and output comparison components.  For a low-end system, the ultra-low power microcontroller is available while the C2000 digital signal processor can be used for a complex system with more features.

Electric motor:
Typically either brush or brushless DC motors are used for the E-bike.  The brushless, although more reliable and efficient, can increase the bike weight.  

Battery:
A variety of battery types are used from lead-acid to lithium.  The lead-acid battery is commonly used for its low-cost but is much larger and heavier as well as less “green” than the lithium battery.   

Power management:
Provides power to run functional blocks and oversees battery activity.  For a low-end E-bike, the host controller with comparators and discretes can be used to manage a lead-acid battery.  More complex E-bikes utilize specific ICs which offer cell protection, monitoring and fuel gauging to provide safety and critical information about the lithium battery to the user.

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