New 48 V Reference Design Aims to Propel E-Bike and E-Scooter Development

The demand for e-bikes, e-scooters, and related merchandise are undoubtedly on the rise. The truth is, in an article on how e-bikes are designed, AAC contributor Steve Arar notes that e-bike firm Lime lately introduced that they’ve reached 150 million rides in simply 3 years. 


E-bike sales over the past couple of years

E-bike gross sales over the previous couple of years. Picture used courtesy Cycle Volta

To assist enhance and develop such applied sciences, Renesas recently released a new 48 V mobility solution. Dubbing their resolution a “profitable mixture,” Renesas expressed hope that the reference design will assist prospects speed up their designs and push them extra shortly to market.


Why 48 Volts?

48 V could look like an arbitrary quantity, however it actually serves a specific purpose

Traditionally, 12 V has been an ordinary voltage degree for energy distribution in lots of functions. But as units from energy instruments to server racks develop and require extra energy, I2R losses have turn out to be vital. So, to fight this problem, engineers have began to undertake 48 V as an ordinary for industrial-type energy provides.

Delivering the identical quantity of energy to a load at 48 V versus 12 V affords 16 occasions much less I2R losses—nothing to scoff at. And since e-bike programs typically require excessive energy outputs to the motor with a view to produce massive quantities of torque, 48 V has turn out to be an ordinary in lots of designs.


Renesas’ Reference Design for 48 V 

With this normal in thoughts, Renesas has now launched a new mobility solution for e-bikes designed at 48 V


Applications of the new Renesas solution

Functions of the brand new Renesas resolution. Picture used courtesy of Renesas


This reference design employs a modular strategy to help within the design of each core and non-compulsory useful blocks that may be adopted for a lot of 24 V–48 V. The design itself consists of 15 totally different Renesas ICs, highlighted by the ISL94216 16-cell battery entrance finish (BFE), the HIP2211 100 V MOSFET drivers, and the RX23T 32-bit microcontroller for motor management. 

The answer is designed to be powered from a 25 AHr Li-ion battery that drives a 1,600 W inverter, good for reaching speeds as much as 5,000 rpm.


The Principal Blocks

The system consists of two core useful blocks and two non-compulsory ones. The core useful blocks embody the battery entrance finish (BFE) and the motor management board whereas the non-compulsory blocks are a Bluetooth low-energy management board and a wi-fi charging receiver board. 

The BFE boasts over 200 mA exterior cell balancing, which Renesas claims to allow quick recharging and excessive utilization in massive battery packs.


System block diagram

System block diagram. Picture used courtesy of Renesas


The motor management board helps a 48 V battery pack and might attain as much as 5,000 RPM utilizing a 1,600-W inverter powertrain with motor management sensors. 


Function-Constructed for Mobility Options

With this launch, Renesas hopes to assist its prospects develop e-bikes and plenty of different mobility options. In keeping with the corporate, the answer is designed for functions like lawnmowers, electrical carts, robotic cleaners, energy instruments, energy banks, and extra. 

DK Singh, director of the programs and options staff at Renesas, says, “Our new 48 V mobility profitable mixture resolution combines Renesas’ superior BFE, industry-leading MCUs, together with analog and energy units, and modern motor management know-how to assist prospects velocity up the event of their excessive energy and torque e-scooters and e-bikes.”