EV Auxiliary Systems

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Optimize EV Auxiliary Loads and Actuators

Electrify auxiliary systems for superior efficiency and comfort in EVs: thermal management with oil pumps, HVAC and battery control made smarter.

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Overview

As vehicles transition from internal combustion engines to electrified powertrains, auxiliary systems play a critical role in ensuring performance, safety, and passenger comfort. Traditional belt-driven components are being replaced by advanced electric solutions that deliver higher efficiency, precise control, and improved reliability.

EV auxiliary systems encompass essential applications such as Battery Management Systems (BMS) for optimal energy utilization, HVAC PTC heaters and e-compressors for climate control, and battery heating and cooling to maintain optimal operating conditions. These systems are powered by high voltage battery in BEVs, HEVs, and PHEVs, as well as 48 V networks in mild hybrids, enabling seamless integration and reduced mechanical complexity. By electrifying pumps, compressors, and thermal management units, automakers can minimize energy losses, reduce wiring weight, and enhance overall system efficiency. These enhancements support extended driving range, faster charging, and greater passenger comfort.

Explore how onsemi enables these innovations with scalable, high-performance solutions designed to meet the demanding requirements of modern EV auxiliary systems. Discover automotive semiconductors covering Automotive Smart Power Module (ASPM), IGBT, EliteSiC, Super-Junction MOSFET, Automotive Power Module (APM) and gate drivers, providing flexibility to design scalable systems and optimize cost per kilowatt.

Products

Intelligent Power Modules (IPMs)
High voltage power modules with integrated gate drivers for consumer, industrial and automotive applications. Offering a large range of 3 Phase inverter modules covering power levels from 50 W to 10 kW. Available in different topologies including PFC and input bridge rectifier.
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MOSFET Modules
MOSFET Modules are used for automotive motor drive and on-board charger applications. They come in 40 V, 60 V, 80 V and 650 V ratings with superjunction technology and sense resistor. Aside from the six-pack and the full and half bridge topology, they are also available in the totem pole PFC topology.
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Silicon Carbide (SiC) MOSFETs

Our SiC MOSFETs are designed to be fast and rugged and include system benefits from high efficiency to reduced system size and cost. MOSFETs are metal–oxide–semiconductor field-effect transistors with insulated gates. These silicon carbide MOSFETs have a higher blocking voltage and higher thermal conductivity than silicon MOSFETs, despite having similar design elements. SiC power devices also have a lower state resistance and 10 times the breakdown strength of regular silicon. In general, Systems with SiC MOSFETs have better performance and increased efficiency when compared to MOSFETs made with silicon material.

There are many advantages to choosing SiC MOSFETs over silicon MOSFETs, such as higher switching frequencies. High-temperature development is also not a concern when using SiC MOSFET modules because these devices can operate efficiently even in high heat. Additionally, with SiC MOSFETs, you benefit from a more compact product size because all components (inductors, filters, etc.) are smaller.

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IGBTs
Insulated Gate Bipolar Transistors (IGBTs) that offer maximum reliability in high performance power conversion applications.
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High Voltage MOSFETs
Portfolio of high voltage super-junction (SJ) MOSFETs meant for general usage and for several applications such as Power Factor correction, server/telecom power, led lighting.
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Gate Drivers
GaN, IGBT, FET, MOSFET, H-Bridge MOSFET, and SiC MOSFET inverting and non-inverting drivers ideal for switching applications.
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IGBT Modules
IGBT Modules are used in traction and in the DC-AC stages of solar inverters, energy storage systems, uninterruptible power supplies and motor drives.
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Low/Medium Voltage MOSFETs
Portfolio of comprehensive range of Low-medium voltage power Mosfets that delivers superior performance and reliability for switching applications. Our cutting-edge PowerTrench® T10 technology delivers industry leading RDS, higher power density, reduced switching losses and better thermal performance.
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Digital Isolators
Products that use a high frequency modulated signal to transmit high speed digital data across a capacitive isolation barrier.
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