Ceralink Capacitors

9th November 2015

CeraLink™ Capacitors

The revolution for fast switching inverters

The new TDK CeraLink™ offers many benefits for stabilizing and filtering the DC link circuits of power inverters – particularly in comparison with conventional capacitor technologies. Developers of topologies with new fast-switching IGBT modules will profit from this innovation.

The power semiconductor switches used in power supplies and inverters are determined by two technologies, namely MOSFETs and IGBTs. MOSFETs can be operated at relatively high switching frequencies significantly above 30 kHz, but unlike IGBTs, they have a very large chip surface area.

A new generation of IGBT modules operates at frequencies of up to 100 kHz. Line-based and turn-off losses are of about the same magnitude in both systems. Fast IGBTs, whose manufacturing complexity is significantly lower and chip areas are often smaller than superjunction MOSFETs, are the basis of an IGBT3 technology with high switching frequencies and an excellent price-performance ratio.

Fast-switching systems require circuit designs with minimized ESR and ESL values. Accordingly, the passive components – inductors, but especially capacitors – must also keep pace with the high switching frequencies. These in turn permit more compact and lightweight passive components to be used, producing lower losses and increasing efficiency.

Capacitors are at the focus of these developments. They must combine high switching frequencies with low ESL and ESR values as well as an extremely compact design. Conventional capacitor technologies are only partially able to meet these requirements. The CeraLink represents a completely new approach: This advanced component is a ceramic multilayer ripple-current suppressor, also known as a link circuit or DC link capacitor; moreover, it functions as a snubber.

The first designs of an on-board inverters, were based on existing OEM specifications for rated voltages of about 400 V DC on the high-voltage side. The CeraLink is currently available in several designs. Its capacitance range extends from 1 µF to 20 µF at rated voltages of 500 V DC and 1000 V DC. The various terminal designs are shown in Figure 1. The SMD versions (LP and SMD) are designed for direct integration in semiconductor power modules in view of the restricted space available (Figure 1). They can be soldered, bonded or sintered.

 

Key Benefits of Ceralink Capacitors:

●Effective capacitance increases with rising voltage and leads to high capacitance density

●Low ESL and low inductive connection

●Low ESR especially at high frequencies and high temperatures

●Highest permissible current per capacitor volume

●High operating and peak temperatures with temperature excursions up to +150 °C

●High robustness against high temperatures

●Supports fast-switching semiconductors and high switching frequencies

●Supports further miniaturization of power electronics on the system level

 

A new approach to ceramic power capacitors

Patented product solution for high DC voltage applications in power electronics based on multilayer components with

●Anti-ferroelectric ceramics

¬Modified Pb La (Zr, Ti) O3

●Copper inner electrodes

●High-temperature stable ceramic- metal interconnects based on sintered silver to realize capacitance values up to 100 μF

 

Comparison @ 25 °C, 1 kHz, 1 V RMS

 

Download our Ceralink Capacitor data sheet - 1uF_500Vdc.pdf

Download our Ceralink Capacitor data sheet - 20uF_500Vdc.pdf

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Ceralink Capacitors

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