High-temperature MLCC products and extreme temperature solution

01-12-2022 | Samsung Electro-Mechanics | Power

Samsung Electro-Mechanics X8L and X8G MLCC guarantee high reliability in extreme temperatures. High voltage power converters are crucial to EV Powertrain systems as HEV is being developed with a combination of the ICE. This article discusses why ICE powertrain operates in a high-temperature environment and which part of the EV powertrain's thermal management is a critical design aspect to consider.

Power Semiconductor Application (SiC) and High-Temperature MLCC Require Driving range on EVs is limited to its battery capacity. What changes would be needed to increase the range? The answer is simple: we need to improve battery capacity and MPGe (km/kW). However, when the battery capacity increases, charging times also increase, making it inconvenient for drivers, which must be resolved.

Car makers continue to develop and improve fast charging systems to reduce this inconvenience for electric vehicle owners. To decrease charging times, there are two options. The first is to increase the charging voltage, and the second is to increase the capacity (kW) of an electric vehicle charger (OBC).

The power semiconductor types selected for the circuit are also important in enabling an efficient power system. SiC MOSFETs are widely used with Automotive Powertrain DC/DC converters, which help improve power density by increasing frequency and voltage. High-power circuit applications such as OBC and Inverters generate heat, ultimately resulting in thermal management issues.

Coolant systems are designed to solve the thermal issue, which originates from the heat generated by the power semiconductors.

This is why high-temperature 150C MLCC is required in the powertrain of internal combustion engines and EV powertrain systems.

Ultimately, all of these mechanically driven devices reduce gas mileage, to solve this problem, these devices are being replaced with electrical alternatives. Additional electrical components, such as an ECU and sensors, are required, and because they are placed in the engine compartment, they are exposed to high temperatures. Overall, an ICE powertrain environment runs at a high temperature. Typically, an exhaust system radiates heat over 587C, and engine oil and transmission oil are roughly 148C, adding to the overall high-temperature environment.

Considering this, OEMs and suppliers provide a mission profile representing the vehicle's temperature load. It is essential to select the appropriate components considering the environmental operating temperature where a product is used. 150C MLCC, and higher MLCC capacitance at a high-temperature range. Temperature and voltage are factors that affect the lifetime of MLCC. 150C MLCC not only guarantees reliability at high temperatures but also provides a higher MLCC capacitance. The company are introducing its 150C MLCC, which guarantees reliability at high temperatures.

By Seb Springall