ROHM Semiconductor Electronic Vehicle (EV) Solutions
ROHM Semiconductor Electronic Vehicle (EV) Solutions are designed to improve efficiency and performance in state-of-the-art EVs. ROHM offers products optimized for various solutions, with a focus on dedicated EV blocks, such as the main inverter, DC-DC converter, onboard charger, and electric compressor.
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Dedicated EV Blocks
For specialized EV Blocks, it is necessary to isolate the 12V low voltage circuit from the high voltage battery/drive system while providing higher reliability, greater miniaturization, and lower power consumption. ROHM meets these needs with a variety of power devices, including silicon carbide (SiC), insulated gate bipolar transistors (IGBTs), and superjunction metal-oxide semiconductor field-effect transistors (SJ MOSFETs).
Onboard Charger
Onboard chargers consist of AC-DC converters that convert an AC voltage (100V to 240V) to a DC voltage in order to charge the high voltage battery. To ensure worldwide compatibility, the permissible input voltage for many onboard chargers ranges from 85V to 265V. And, to meet market needs for shorter charge times, the voltage specified under fast charging standard is increased, along with battery voltage. As a result, onboard chargers tend to have higher permissible input voltage, promoting the use of SiC not only for the internal diodes, but MOSFETs as well.
DC-DC Converter
In EVs, the engine is replaced by a high voltage battery and motor. The DC-DC converter switches power elements and utilizes a transformer to convert the high battery voltage to a lower voltage. To protect low voltage electronic circuits, it is necessary to electrically isolate both the signal and ground from the low and high voltage boards. ROHM DC-DC converters with built-in SiC MOSFET enable high-speed switching, making it possible to achieve greater miniaturization and higher performance while improving safety.
Main Inverter
The main inverter converts the DC voltage provided by the battery into 3-phase AC voltage for driving the motor. Many power devices used in inverters consist of IGBTs and diodes. The combination of SiC MOSFETs and SiC Schottky barrier diodes offers lower resistance, lower switching losses, and reduced ON resistance.
Electric Compressor
In EVs, the AC compressor is electric. High voltage is used to increase motor efficiency, and for inverters that control rotation, high voltage, along with high reliability and high efficiency, are important factors. ROHM IGBTs for electric compressors are low-loss devices that achieve superior short-circuit tolerance.
SIC MOSFETs & SBDs
Utilizing SiC power devices makes it possible to reduce the size and power consumption of EV systems. Superior voltage and thermal resistance enable mounting under harsh environments and provide greater space savings through optimized thermal design. This contributes to higher efficiency in EVs while expanding interior cabin space.
LDO Regulators
Along with greater functionality and accuracy in automotive blocks, ICs that can supply stable power to MCUs and sensors are increasingly in demand. In response, ROHM offers linear regulators that are strong against external noise and battery fluctuations. ROHM also offers a broad lineup of class-leading automotive-grade quiescent current regulators that contributes to greater energy savings and enables users to select the ideal product based on application requirements.
Low Ohmic Resistors
High power handling capability and ultra-low resistance are ideal for current detection in high-power automotive blocks. High precision welding technology utilized between the resistive elements and electrons allows ROHM PSR series shunt resistors to deliver excellent temperature coefficient of resistance (TCR), even in the low-ohmic region.
IGBT
ROHM IGBTs contribute to greater energy savings and efficiency in a wide range of high voltage, high current applications. Original trench gate structure and thin wager technology achieve low switching loss and VCE(sat). This makes the AEC0Q101-qualified RGS series ideal for various EV systems, including the electric compressor.
SBDs
The broad lineup consists of low VF and ultra-low IR types that allow users to select the ideal product based on set requirements.
MOSFETs
ROHM offers a wide range of MOSFETs that support various motor and drive applications, including low ON resistance models developed using the latest processes.
Additional Resource
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