Micromobility solution integrates 32-bit MCU with battery frontend

Micromobility solution integrates 32-bit MCU with battery frontend

New Products |
By Christoph Hammerschmidt

The reference design allows the selection of different function blocks according to applications requirements, reduces product development time and reduces the bill of materials. With solution, e-scooters, e-bikes, uninterruptible power supplies (UPS) and energy storage systems can be developed faster.

It uses a modular approach to both hardware and software. This makes it possible to provide main components and optional function blocks that can be used in many applications with 24V to 48V, such as electric vehicles – but also chargers, cleaning robots and much more. The design uses 15 Renesas ICs including three key components: the 16-cell battery front-end (BFE) ISL94216, the rugged 100V MOSFET drivers HIP2211 and the 32-bit RX23T microcontroller (MCU) for motor control. The 48 V mobility winning combination is powered by a 25 Ah lithium-ion battery that drives an inverter (1600 W), reaching 5000 rpm.

“Micro-mobility, such as in the form of e-scooters and e-bikes, enables attractive locomotion with a small CO2 footprint for the first or last mile. The growing demand for these applications is driving new battery management features as cell balancing plays an increasingly important role in recharging,” explains DK Singh, Director, Systems and Solutions Team at Renesas. “Our 48V Mobility Winning Combination helps our customers to develop their high performance, high torque e-scooters and e-bikes faster”.

The solution includes two boards designed to support the higher battery cell count and higher performance of mobility applications. The board containing the BFE (Battery Front End) and the charging unit is designed for larger battery packs with higher voltages. The motor control and inverter board provides synchronized current and voltage measurements and drivers driven by PWM (Pulse Width Modulation) to drive the motor and monitor motor status. The integrated algorithm together with the hardware is ideal for controlling brushless DC (BLDC) motors. In addition, two more boards are optionally available: a board with a receiver for wireless charging and a board with Bluetooth Low Energy (BLE 5.0) for control.

To control the entire system, this winning combination uses a low-cost, energy-saving RX23-T microcontroller with integrated floating point processor (FPU) and six high-performance timers, which are specially adapted to the complex algorithms for driving inverters. These specific characteristics and the modular design help developers to drastically reduce their workload in software and hardware development and troubleshooting. Unlike other single-chip battery management ICs, ISL94216 provides additional features to improve battery life and safety with cell voltage equalization and system parameter monitoring, independent of the MCU. The winning combination also utilizes the ISL81601, a bidirectional synchronous four-quadrant up/down converter (60 V) for ultra-fast charging. The CC/CV (Constant Current/Constant Voltage) charging profile required by the controller is implemented in the system MCU.

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