WPG World Peace Group launches e-Compressor air compressor solution for new energy vehicles with Qixin Micro products as the core

On October 9, 2024, WPG Holdings, a leading international semiconductor component distributor dedicated to the Asia-Pacific market, announced that its subsidiary WPI has launched an e-Compressor air compressor solution for new energy vehicles, which is mainly based on Flagchip MCU and supplemented by NXP, Onsemi, Vishay and Nanochip chips as peripheral devices.

Figure 1- A display board of WPG's new energy vehicle e-Compressor air compressor solution with Flagsin Micro products as the core

With the rapid development of the new energy vehicle industry, high-voltage fast charging technology has become the key to solving the problems of "mileage anxiety" and charging efficiency. Under this trend, more and more car companies are moving towards the 800V high-voltage platform. In response to this, WPG World Peace launched a new energy vehicle e-Compressor air compressor solution with FlagCore FC4150F512BS1P64T1A MCU as the core, equipped with NXP automotive safety system basic chip (SBC) MFS2300BMBA0EP, onsemi IPM module NFVA23512NP2T, PSR DC/DC NCV12711ADNR2G device, Shengbang micro operational amplifier SGM8557H-1AQ, nanocore micro isolators NSI8220W0, NSI1311 and NSI1300D25, Molex connectors and Vishay resistors. This solution meets the ASIL-B functional safety level and can be used as an air conditioning system to drive new energy vehicles.

Figure 2-Application scenario of WPG's new energy vehicle e-Compressor air compressor solution with Flagsin Micro products as the core

Flagchip FC4150F512BS1P64T1A is a 32-bit microcontroller based on the ARM Cortex-M4 core, with a maximum operating frequency of 150MHz, built-in high-speed memory, rich I/O ports and peripherals, and the ability to expand multiple functions.

In terms of IPM module design, the solution uses Onsemi's NFVA23512NP2T chip, which has three built-in high-speed half-bridge high-voltage gate drive circuits, integrated (1200V/35A) low-loss IGBT tubes, built-in high-side bootstrap diodes, and supports a maximum 20KHz PWM with a minimum dead zone time of 2μs. The device also provides multiple protection functions, including undervoltage lockout, overcurrent lockout, temperature monitoring and fault reporting of the driver and integrated circuit, etc., which can bring high performance and high safety features to automotive motors.

The low-voltage power supply of this solution is divided into two channels. In the MCU power supply part, a power management chip with functional safety, MFS2300BMBA0EP, is used. This product integrates multiple LDO outputs and multiple monitoring and diagnostic functions, including wake-up input, watchdog, reset, interrupt, and failure output after circuit diagnosis, etc. The device has built-in CAN and LIN modules, which can quickly interact with other modules. In addition, MFS2300BMBA0EP communicates with MCU through SPI, and can provide potential fault monitoring reports when the system is running to enhance safety features.

The IPM power supply uses Onsemi's NCV12711ADNR2G, which is a fixed frequency peak current mode PWM controller suitable for isolated DC/DC topology. The device operates in the range of 4V to 45V, does not require an auxiliary winding, supports programmable frequency adjustment from 100kHz to 1MHz, and has built-in slope compensation to avoid subharmonic oscillations. In addition, the controller integrates soft start, undervoltage lockout (UVLO) and overpower protection (OPP) functions to improve system safety.

In the selection of isolators, the NSI8220W0, NSI1311 and NSI1300D25 used in the solution are all products of Nanochip. Among them, NSI8220W0 is used to transmit PWM signals, feedback VFO, and LDO_PG signals; NSI1311 is used to sample bus voltage and IPM temperature signals; NSI1300D25 is used to sample the current of the bottom side tube of IPM.

For the operational amplifier part, the solution uses Shengbang Micro's automotive-grade SGM8557H-1AQ. This product can be used to convert the differential signals output by the voltage and current sampling isolators into single-ended outputs for sampling by the MCU ADC peripherals.

Figure 3-Block diagram of WPG's new energy vehicle e-Compressor air compressor solution with Flagsin Microelectronics products as the core

In addition to the rich hardware support, this solution adopts the software library architecture of the World Peace Sensorless FOC dual-resistance sampling, and uses the onboard potentiometer to rotate the motor. It also uses the dual-loop control of the current loop and the acceleration loop to make the system operation more stable.

Core technology advantages:

• The combination of MFS2300BMBA0EP (SBC) and FC4150F512BS1P64T1A (MCU) meets the ASIL-B functional safety requirements;

• The SBC FCCU hardware monitors MCU failures, while the Watchdog monitors MCU survival to ensure system failure safety protection;

• Provide full-function motor soft and hard fault protection, over-current, over-voltage, under-voltage, stall, phase loss, over-temperature, etc.

• Provide software demo algorithms, such as high frequency injection, dead zone compensation, sliding film observer, FOC, etc.;

• Provide hardware reference design to accelerate product development.

Program Specifications:

• High-voltage side input voltage range: 460VDC~860VDC;

• Low voltage side input voltage range: 8VDC~18VDC;

• MCU: ARM Cortex-M4 32-bit core, main frequency up to 150MHz, ASIL-B functional safety level;

• Support CAN and LIN communication;

• Support 2/3 Shunt R three-phase current sampling;

• Support overvoltage, overcurrent and overtemperature protection;

• Onboard potentiometer supports speed adjustment;

• Equipped with LED indicator & UART debugging interface;

• Development board size: MCU board 70mm×40mm, motor driver board 150mm×135mm.