CRE Film Capacitors in Automotive Applications

CRE Capacitors are essential for stabilizing and safeguarding electronic systems from voltage spikes, electromagnetic interference (EMI), and other disturbances. In the context of EV traction inverters, two main types of capacitors are widely used:

Snubber Capacitors: These capacitors suppress voltage spikes by connecting to high-current switching nodes, protecting sensitive electronic circuits.

DC-Link Capacitors: They mitigate inductance effects in inverters and act as filters to shield EV subsystems from voltage surges and EMI.

CRE Film capacitors, known for their high reliability, low equivalent series resistance (ESR), and excellent thermal stability, are particularly suited for these applications. Their robust performance under high voltages and temperatures makes them a preferred choice for automotive engineers.

Traction Inverter Topologies and Capacitor Design

Traction inverters, which are central to EV powertrains, utilize different topologies based on switch type, voltage levels, and application requirements. The four most common topologies include:

650V IGBT Switch Topology

650V SiC MOSFET Switch Topology

1200V SiC MOSFET Switch Topology

650V GaN Switch Topology

These topologies fall into two main subsets:

400V Powertrains: Widely used with simpler 2-level topologies.

800V Powertrains: Common in higher voltage systems, such as electric trains and ships, which may use more complex multi-level topologies.

The selection of capacitor types and specifications depends on the chosen inverter topology. For instance, 400V powertrains typically demand compact and cost-effective solutions, while 800V systems prioritize higher voltage endurance and advanced thermal management. Film capacitors excel in meeting these varied requirements due to their customizable properties and scalability.

Why CRE Film Capacitors Stand Out?

Film capacitors offer several advantages in automotive applications, including:

High Voltage Handling: Suitable for both 400V and 800V powertrains.

Thermal Resistance: Operate efficiently in the high-temperature environments typical of EV systems.

Longevity: Provide extended operational life, reducing maintenance and replacement costs.

As the automotive industry transitions toward electrification, the demand for reliable and efficient components like film capacitors will continue to grow. Their role in enhancing the safety and functionality of power electronic systems solidifies their position as a cornerstone of modern EV technology.

Looking Ahead

With advancements in materials and manufacturing techniques, CRE Film capacitors are poised to meet the increasing performance demands of next-generation EVs. As engineers innovate to optimize powertrain efficiency and cost-effectiveness, the adaptability of film capacitors ensures their relevance in the automotive sector for years to come.

CRE Solution
DC-link C1			Snubber C2
DKMJ-AP	DMJ-PS	DMJ-PC	SMJ-P	SMJ-PS
Voltage
450~1200 (VDC)			630~2000 (VDC)
Capacitance
100~5000 (UF)	10~500 (UF)	1~150 (UF)	0.15~4.7 (UF)
Standard：：IEC-61071 ,AEC-Q200