New power inverter platform from NXP
NXP Semiconductors announced a new automotive power control reference platform for an electric vehicle traction motor inverter. The new power inverter reference design platform combines NXP’s automotive microcontrollers (MCUs), power management system basis chips (SBCs), and new isolated high-voltage IGBT gate drivers with application specific system enablement software. The company says the combination is designed to help carmakers deliver the next generation of hybrid and electric vehicles with greater speed and less development risk.
Traction motor inverters convert DC battery voltage to multi-phase alternating current to drive the traction motors of electric and hybrid vehicles at the speed and acceleration demanded by the driver. Complex system control is required to monitor the motor’s state, sense the driving currents, and reliably calculate and apply the desired torque energy.
NXP partnered with VEPCO Technologies to engineer an ASIL-D-capable, high-voltage power control reference platform and inverter prototype. For the prototype, the platform controls a Fuji Electric 800V silicon IGBT power module with integrated current and temperature sensing for driving 100 kW 3-phase motors.
NXP plans to enable its customers to develop motor inverters based on the reference design platform with its system control components, enablement software, and functional safety enablement, while VEPCO Technologies will offer contract system engineering services for application and performance specific development on the platform.
The control reference platform uses NXP automotive components to provide the required functional building blocks with an efficient system bill-of-materials for both inverter control and drive operations and functional safety assurance.
The new GD3100 isolated high-voltage gate driver IC targets ISO 26262 ASIL D compliancy. It features IGBT gate control redundancy and on/off state validation, IGBT current and temperature monitoring, analog and logic BIST, and low- and high-voltage fail-safe inputs.
The MPC5775E microcontroller comes with integrated motor control capabilities and software resolver implementation. Running PMSM sensorless field-oriented control uses < 10% of its computing capabilities, leaving maximum bandwidth for the required safety features and complex driving strategies.
The FS65xx is a power management safety system basis chip designed in multiple electrification applications. It includes ASIL- D ready fail-silent functional safety as a safety element out of context.