Drawing on more than two decades of experience in developing new isolation manufacturing technologies and integrated circuits (ICs) for high-voltage systems, Texas Instruments (TI) introduced a new family of solid state relays, including automotive-qualified isolated drivers and switches, These products provide the industry's best reliability and help improve the safety of electric vehicles (EVs). These new isolated solid state relays also enable ultra-small form factor solutions while reducing bill of materials (BOM) costs for powertrain and 800V battery management systems.
The TPSI3050-Q1 isolated switch driver with integrated 10V gate supply and the TPSI2140-Q1 1400V, 50mA isolated switch each use a unique approach that integrates power and signal isolation through a single isolation barrier, improving reliability while significantly reducing Solution size and cost reduction (compared to existing electromechanical relays and solid state photorelays). These devices are the first in a new line of solid-state relays that will also include integrated circuit devices designed for high-voltage industrial applications. To learn more about the benefits of solid state relays, read the technical article "How to Use Solid State Relays for Higher Reliability Isolation and Smaller Size Solutions".
"High-voltage systems are becoming more commonplace, especially with the proliferation of electric vehicles. At TI, we're very focused on finding new ways for system designers to solve complex isolation challenges, such as securing vehicles as the industry transitions to 800V batteries. Reliable and safe operation while reducing solution size and cost," said Troy Coleman, vice president and general manager of Power Switching, Interfaces and Lighting at Texas Instruments (TI). "By integrating more functionality into isolation technology, our new solid-state relays enable engineers to reduce the size, cost and complexity of high-voltage power supplies while safeguarding the safety of next-generation automotive and industrial systems."
Higher system reliability through integrated isolation technology
New solid-state relays can disconnect and connect loads through a single isolation barrier in microseconds (compared to milliseconds for electromechanical relays), enabling safer operation of high-voltage automotive systems. The TPSI3050-Q1 provides up to 5kVRMS of reinforced isolation, and its operating life is also 10 times higher than that of electromechanical relays, which also degrade over time. In addition, the TPSI2140-Q1 provides up to 3.75kVRMS of base-type isolation, enabling it to achieve more than four times higher time-dependent dielectric breakdown reliability than solid-state photorelays.
Reduce system size and cost with integrated power and signal isolation
Solid-state relays integrate power and signal transmission into a single chip, while also eliminating at least three components from their design, significantly reducing solution size while reducing BOM cost by up to 50%. Compared to mechanical relay solutions, the TPSI3050-Q1 can reduce solution size by up to 90% by integrating the functions of isolated power supplies, digital isolators and gate drivers. Compared to traditional solid state photorelay solutions, the TPSI2140-Q1 can reduce solution size by up to 50% by integrating signal FETs and resistors and eliminating the need for reed relays.
Improving the safety of 800V battery management systems
Designed for high voltage measurement and insulation monitoring, the TPSI2140-Q1 can be used with battery pack monitors such as the BQ79631-Q1 to detect insulation faults in 800V battery management systems faster and more accurately than solid state photorelays. The TPSI2140-Q1 supports the use of resistors smaller than 1MΩ and can withstand 300% more avalanche current than traditional photorelays, contributing to safer human-machine interaction.
Realize different designs through a variety of isolation products
Solid State Relays are a new addition to TI's growing product line for isolating signals and/or power. Other new products include the UCC14240-Q1 isolated DC/DC bias power module, which utilizes TI's proprietary integrated transformer technology to achieve high power density, low EMI and high reliability for extended electric vehicle driving range; other isolated products Also included is the AMC23C12, the industry's first reinforced isolated comparator. The AMC23C12 combines the functionality of a standard comparator with a galvanic isolation barrier to reduce solution size by 50% while providing ultra-fast isolated bidirectional overcurrent and overvoltage detection in less than 400 nanoseconds
