Texas Instruments has introduced a fully tested battery management and traction inverter system reference design

     Texas Instruments has introduced a fully tested battery management and traction inverter system reference design, as well as new analog circuits with advanced monitoring and protection features that help reduce carbon dioxide emissions and enable hybrid electric vehicles and electric vehicles (HEV/EV) to last longer.

     Texas Instruments' new Battery Management System (BMS) reference design - Scalable 6 to 96 string battery monitoring circuits with advanced BQ79606A-Q1 precision battery monitors and equalizers. Engineers can use reference designs to quickly bring their vehicle designs to market. The design enables battery monitoring in a Daisy chain configuration, creating a highly accurate and reliable system design for lithium-ion battery packs from 3 strings to 378 strings and from 12 V to 1.5 kV.

     The highly integrated BQ79606A-Q1 precisely monitors temperature and voltage levels, helping to maximize battery life and on-road time. In addition, the BQ79606A-Q1 battery monitor features safety status communication to help system designers meet automotive Safety Integrity Level D (ASIL-D) requirements. This is the highest functional safety objective as defined in the ISO 26262 road vehicle standard.

     With as much as tens of kilowatts of power flowing through electric vehicles' traction inverters and batteries, high temperatures can damage expensive and sensitive powertrain components. Excellent system thermal management is essential for vehicle performance and for the protection of drivers and passengers. To protect powertrain systems, such as 48-V starter generators, from overheating, Texas Instruments introduces the TMP235-Q1 precision analog output temperature sensor. This low-power, low-static current (9μA) device with high accuracy (typical values of ±0.5°C and maximum accuracy of ±2.5°C over the entire operating temperature range from -40°C to 150°C) helps the traction inverter system to react to temperature fluctuations with appropriate thermal management techniques.

     The TMP235-Q1 temperature sensor is combined with the recently announced UCC21710-Q1 and UCC21732-Q1 gate drivers to help designers create smaller, more efficient traction inverter designs. These devices are the first isolated gate drivers to integrate IGBT and SIC FET sensing - enabling higher system reliability in applications up to 1.5 kVRMS and isolated surge protection beyond 12.8 kV (specified isolation voltage is 5.7 kV). These devices also provide fast detection times to prevent overcurrent events while ensuring a safe system shutdown.

     To power the new gate driver directly from the car's 12V battery, Texas Instruments has released a new reference design that demonstrates three types of IGBT/SiC bias power options for traction inverter power levels. The design includes reverse polarity protection, electrical transient clamping, and over - and under-voltage protection circuits. The compact design includes the new LM5180-Q1. It is A 100 V, 1 A synchronous buck converter with extremely low 10-μA typical standby static current.