Renesas Introduces 48V Mobility Solution for Complex Inverter Control Algorithms

August 27, 2020 Tiera Oliver

Renesas introduced a 48V mobility solution designed to help customers accelerate the development of e-scooters, e-bikes, UPS, and energy storage systems.

The design uses 15 Renesas ICs, including three key devices: the ISL94216 16-cell battery front end (BFE), robust HIP2211 100V MOSFET drivers, and RX23T 32-bit microcontroller (MCU) for motor control. The 48V mobility solution is powered from a 25 AHr Li-ion battery that drives a 1600W inverter to attain speeds up to 5000 rpm.

This reference design uses a modular approach in both hardware and software to showcase 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.

The 48V mobility solution 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 ideal for driving brushless DC (BLDC) motors. Also, two optional boards are available: the wireless charging receiver board, and the Bluetooth Low Energy (BLE 5.0) control board.

For system control, the solution uses a RX23T MCU with built-in floating point unit (FPU) and six high-performance timers tooled for complex inverter control algorithms. According to the company, these features and modular design help engineers reduce the hours in software/hardware development and debug. In addition, unlike other large cell count single-chip battery managers, the integrated ISL94216 offers features that balance and monitor system conditions to improve battery life and safety, independent of the MCU. The solution also uses the ISL81601 60V bidirectional 4-switch synchronous buck-boost controller for ultra-fast charging. The controller’s CC/CV charger profile is implemented through the system MCU.

Key Features of the 48V Mobility Solution

BFE and Charger Board

  • ISL94216 16-cell BFE supports up to 200 mA+ external cell balancing – key to enabling ideal recharging and high utilization in large battery packs with hot plug tolerance up to 62V
  • BFE provides full high-side, battery protection and monitoring for 4S to 16S cell battery packs
  • Renesas’ RX23T 32-bit MCU with built-in FPU supports full control of entire system
  • Renesas ISL28214 op amps deliver low power consumption and input bias, and the ISL81601 maximizes charging efficiency and uses current sensing and I/O monitoring to adjust input levels
  • Renesas’ ISL84051 multiplexer handles up to eight inputs with low RDSon connectivity and nanosecond switch times

Motor Control and Inverter Board

  • The motor control and inverter board supports a 48V battery pack and can reach up 5000 RPM using a 1600-watt inverter powertrain with motor control sensors
  • Motor control and inverter board includes a DC/DC converter, ISL28191 op-amp current sensors, ISL80410 LDO regulator, HIP2211 100V half-bridge MOSFET drivers, and MOSFET bank; connects to the BFE and charger board

Optional Boards and Mobile Phone Application

  • BLE control board with RX23W MCU enables secure mobile phone connectivity via BLE for throttle control, battery status, GPS connection, and saved route history; connects to the BFE and charger board. This MCU is chosen from the same RX Family to enable monotonic software design
  • Wireless charging receiver board features two Renesas wireless receivers used in parallel to boost output as needed; connects to the BFE and charger board
  • Mobile phone application unlocks scooter, controls ON/OFF power and motor start
  • Mobility solution sends diagnostic and parametric data to mobile phone’s secure BLE channel in 1-second intervals

For more information on the Renesas 48V mobility solution, including system block diagram, bill of materials (BOM), and data sheets, visit: www.renesas.com/solutions/industrial-automation/motion-and-drives/48v-mobility-solution.

The new ISL94216 16-cell BFE is available now in a 64-lead QFN package from Renesas’ worldwide distributors, and is priced at $2.99 USD in 1,000-unit quantities.

For more information, visit: www.renesas.com/products/ISL94216.

About the Author

Tiera Oliver, edtorial intern for Embedded Computing Design, is responsible for web content edits as well as newsletter updates. She also assists in news content as far as constructing and editing stories. Before interning for ECD, Tiera had recently graduated from Northern Arizona University where she received her B.A. in journalism and political science and worked as a news reporter for the university's student led newspaper, The Lumberjack.

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