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PARALLEL TO SERIAL CONVERTER RC NET WORK TRIAL

Locate the origin of the ringing frequency with near field probes (if necessary).

But note, in some situations the ringing with low power could be different from the ringing at higher power (especially if parasitic capacitances in diodes or transistors change with power).

Consider reducing power in your application to minimize the risk of damage to the prototype (and increasing safety for user).

Because ringing is related with parasitics, it is not easy to optimize the network by simulation (note I write it is not easy, but it is possible).Ī typical procedure to obtain optimum values for Rs and Cs in applications is explained in the following procedure:

PARALLEL TO SERIAL CONVERTER RC NET WORK TRIAL

The proper values for Rs and Cs are usually obtained by experimental procedures and/or by trial and error using a real prototype. The Rs-Cs snubber network looks like Figure 1, where both components are connected in parallel with transistors and diodes, especially in switching applications as inverters or DC/DC converters.įigure 1: Typical RC networks in diodes and transistors In my previous article “Ringing with High Quality Components” ( In Compliance, May 2017) I explained that ringing is the origin of emissions, distortion, damage, instability, etc., and introducing losses using resistors or ferrites is a common solution, especially when the ringing frequency is not high enough from the switching frequency, situation where the RC snubber network explained in this article is not so useful or possible. I t is common practice in power electronics to use simple resistor-capacitor (RC) networks to reduce the stress in power transistors and diodes due to voltage spikes created by parasitic inductances and capacitances in transformers, inductors, diodes, transistors, layout, and other components.Ī co-lateral effect of those spikes is related with EMI/EMC problems in both conducted and radiated emissions because the existence of some resonance (ringing) between inductances and capacitances.

Snubbers are RC networks that are really useful for protecting components (transistors, diodes, etc.) and reducing EMI, especially in switching applications.