网页This section discusses parasitic oscillation and ringing of a MOSFET in switching applications. The oscillation and ringing of the gate voltage could cause false switching, increase power losses and lead to permanent damage of a MOSFET. Major causes of the oscillation and ringing of a MOSFET are as follows:
Electronic oscillator - Wikipedia
网页An electronic oscillator is an electronic circuit that produces a periodic, oscillating or alternating current (AC) signal, usually a sine wave, square wave or a triangle wave, [1][2][3] powered by a direct current (DC) source.
Modeling and Analysis of SiC MOSFET Switching Oscillations
网页2016年7月7日 · SiC MOSFETs exhibit extremely fast switching characteristics, which are unfortunately accompanied by undesirable switching oscillations. In this paper, equivalent circuit models incorporating all parasitic elements are developed for the turn-ON and turn-OFF of a SiC MOSFET.
网页The occurring oscillations are caused by the high commutating inductance. Compared to the turn-off behavior with Lσ = 50 nH, it can be recognized that the switching speed decreases considerably due to the higher Rg off and, consequently, lower rise rate of the voltage. That causes an immense increase of turn-off losses. 1.4.
A Switching Oscillation Suppression Method With Clamping …
网页In this article, an oscillation suppression method with clamping function and quantitative design is presented, which not only effectively clamps the drain-source voltage overshoot but also does not reduce the switching speed and increase the switching loss.
A Switching Oscillation Event-Triggered Switch Fault Detection …
网页To address the challenges, a novel method is proposed to detect and diagnose the switch fault using the converter PWM high-frequency (HF) switching oscillation. First, the switching event status in a SiC dc–dc converter is captured from the HF switching oscillation current in a noncontact way.
网页inductor of a switching converter meet is called the switch node. It is not uncommon for the parasitic inductances and capacitances to interact and cause voltage oscillations in the 200-MHz+range at the switch node. If the amplitude of this ringing is above the absolute maximum rated voltage of the low-side switch, it can be destructive to the ...
Why does turning a MOSFET ON too fast cause ringing?
网页2019年1月2日 · When the FET turns OFF, a series LC circuit is formed. Its inductance is the load and traces, and its capacitance is the FET's Cds. Depending on layout, this can ring at high frequencies. The fix is to switch slower by adding a resistor to the gate, or add a snubber, or reduce the parasitics by a better layout. Ringing at turn-on
网页Parasitic oscillation is a push-pull situation where the voltages and currents oscillate out of phase between devices. Parasitic oscillation can be very intermittent in nature, compounded by the fact that the impedance of test probes may in some cases eliminate it, making it difficult to prove its existence.
What is causing large oscillations in my DC/DC boost converter?
网页The oscillations on the output are large, that is 3 V peak to peak. After doing a bit of research it seems that my problems are not particular to my choice of converter, but, to problems with my PCB layout (see links below). I'm not sure how to fix my layout to ensure acceptable results.
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