Application Note

Snubber Capacitors In The Field

Knowles - snubber capacitors in the field

Snubber capacitors have a vital role in reducing the negative effects of switching in various applications, especially in switching power supplies. Challenges such as switching transients, parasitic elements, and high-frequency noise are common in this kind of application, making the need for snubber capacitors crucial. Insulated-Gate Bipolar Transistors (IGBTs) are used in electric vehicles (EVs) as they allow for efficient power conversion. EV inverters, which are essential for converting battery power into the energy needed to drive traction motors, rely heavily on IGBTs and snubber capacitors for seamless operation. However, the industry is shifting towards using wide-bandgap semiconductors, and engineers need to reassess component selection criteria, including voltage rating, capacitance value, equivalent series resistance (ESR), and equivalent series inductance (ESL).

This article will explain the changing landscape of power supply circuits and why it's important to adapt to advancements in semiconductor technology.

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