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Monitoring and Protection Reference Designs, Analog ICs Target EVs/HEVs

TI's new products promise faster time-to-market, accurate battery monitoring, and reliable thermal management.

Texas Instruments (TI) recently introduced fully tested reference designs for battery management and traction inverter systems, along with new analog integrated circuits (IC) with advanced monitoring and protection features. They help reduce carbon-dioxide emissions and enable hybrid electric vehicles (HEVs) and electric vehicles (EVs) to drive farther and longer.

Scalable across 6- to 96-series cell-supervision circuits, TI’s new battery-management system (BMS) reference design features the advanced BQ79606A-Q1 precision battery monitor and balancer. Engineers can get their automotive designs to market quickly using the reference design, which implements the battery monitor in a daisy-chain configuration to create an accurate and reliable system design for 3- to 378-series, 12-V to 1.5-kV lithium-ion battery packs, claims TI.

The highly integrated BQ79606A-Q1 accurately monitors temperature and voltage levels. It helps maximize battery life and time on the road. The BQ79606A-Q1 battery monitor features safe-state communication that helps system designers meet requirements up to Automotive Safety Integrity Level D (ASIL D), which is the highest functional safety goal defined by the ISO 26262 road-vehicles standard.

Thermal Management Across Traction Inverter System

With so many kilowatts of power filtering through an EV’s traction inverter and batteries, high temperatures could potentially damage expensive and sensitive powertrain elements. Excellent thermal management of the system is crucial to vehicle performance, as well as protecting drivers and passengers.

To protect powertrain systems such as a 48-V starter generator from overheating, TI introduced the TMP235-Q1 precision analog-output temperature sensors. This low-power, low-quiescent-current (9-µA) device provides high accuracy (±0.5°C typical and ±2.5°C maximum accuracy across the full operating temperature from -40°C to 150°C) to help traction inverter systems react to temperature surges and apply appropriate thermal management techniques, says the company.   

Advanced Protection, Space in Traction Inverter Systems

The TMP235-Q1 temperature-sensing device joins the recently released UCC21710-Q1 and UCC21732-Q1 gate drivers in helping designers create smaller, more efficient traction-inverter designs. According to the company, these devices are the first isolated gate drivers to integrate sensing features for insulated-gate bipolar transistors (IGBTs) and silicon carbide (SiC) field-effect transistors, enabling greater system reliability in applications operating up to 1.5 kVRMS and with superior isolation surge protection exceeding 12.8 kV with a specified isolation voltage of 5.7 kV. The devices also provide fast detection times to protect against overcurrent events while ensuring safe system shutdown.

To power the new gate drivers directly from a car’s 12-V battery, TI has released a new reference design demonstrating three types of IGBT/SiC bias-supply options for traction inverter power stages. The design comprises reverse-polarity protection, electric-transient clamping and over- and under-voltage protection circuits. The compact design includes the new LM5180-Q1, which is a 65-V, primary-side regulation flyback converter with a 100-V, 1.5-A integrated power MOSFET.

Learn more about TI’s extensive reference designs and integrated circuits across powertrain systems at TI.com/EV.

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