16 cell reference design supports 48V micromobility

August 26, 2020 //By Nick Flaherty
16 cell reference design supports 48V micromobility
A modular reference design from Renesas Electronics provides hardware and software blocks for 48V micromobility designs.

Renesas Electronics has launched a modular 48V micromobility reference design that combines a microcontroller with 16 cell battery monitoring system for e-scooters, e-bikes, UPS and energy storage systems.

The micromobility reference design uses a modular approach in both hardware and software to provide core and optional functional blocks that can be adopted for many 24V-48V applications such as lawn mowers, electric carts, robot cleaners, power tools, power banks, and more. It uses 15 Renesas chips, including three key devices: the ISL94216 16-cell battery front end (BFE), HIP2211 100V MOSFET drivers and RX23T 32-bit microcontroller (MCU) for motor control. The 48V design is powered from a 25 AHr Li-ion battery that drives a 1600W inverter to attain speeds up to 5000 rpm.

“Micromobility options like e-scooters and e-bikes offer an attractive, low-carbon footprint vehicle for first-mile and last-mile travel. Rising demand for these applications is driving new battery management capabilities as cell balancing plays an increasingly critical role in recharging,” said DK Singh, Director, Systems and Solutions Team at Renesas. “Our new 48V mobility winning combination solution combines Renesas’ advanced BFE, industry-leading MCUs, along with analog and power devices, and innovative motor control technology to help customers speed up the development of their high power and torque e-scooters and e-bikes.”

The 48V design includes two boards that address the higher battery cell count and power levels mobility applications require. The BFE and charger board focuses on larger, higher voltage battery packs. The motor control and inverter board features synchronized current/voltage measurements and drivers that are pulse width modulated (PWM) to actuate the motor, and monitor motor status. The algorithm with the hardware is targetted at brushless DC (BLDC) motors. Also, two optional boards are available, with a wireless charging receiver board and Bluetooth Low Energy (BLE 5.0) control board.

For system control, the micromobility design uses a cost optimized, energy-efficient RX23T MCU with built-in floating point unit (FPU) and six high-performance timers specifically tooled for complex inverter control algorithms. These specific

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