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How is reverse recovery calculated?
Reverse recovery occurs after the input voltage transitions from +Vo to −Vo at time t = T/2.
What causes reverse recovery?
When a diode is reverse-biased, carriers are swept out of the drift layer until the forward current becomes zero. During this process, a large recovery current flows through the diode in the reverse direction. This current causes a large reverse recovery loss.
How can the reverse recovery time of a diode be improved?
faster diodes has lower reverse recovery current and shorter recovery time. If you don’t have problem in to increase losses then you can use bigger gate resistor to decrease di/dt and the spikes.
How can I improve my reverse recovery?
Why is reverse recovery time important?
The reverse recovery is very important especially when switching from higher currents to high reverse voltage within a very short time (switching off losses).
How do you reduce reverse recovery?
What is the proper way to check reverse recovery time In LTspice?
But if I set Trise and Tfall as 0.00000001 which is the 1/1000 of the square wave period, I get the following plots for the diode currents: As you can see the fast recovery time of 1N4148 can be seen very explicitly. What is the proper way to check reverse recovery time in LTspice/SPICE?
How to calculate the total pulse width In LTspice?
In your case, you have Tperiod=10u and Ton=5u, which means that Tfall/Trise will be 0.1*Ton=0.5u. This also means that the total pulse width, calculated from the time it reaches 50% of the rising time, until 50% of the falling time, gets to be Ton+ (Trise+Tfall)/2=5u+ (0.5u+0.5u)/2=5.5u.
What’s the proper way to demonstrate reverse recovery time?
LTspice’s solution for this is the parasitics, Rser and/or Cpar, but Rser is the one that matters. When set, it will be converted, internally, into a current source, thus having much higher chances of convergence. For your case, it’s unlikely this will be needed, but it’s not a bad thing to remember.
Can you set rise and fall times to zero In LTspice?
In LTspice, setting the rise and fall times of a pulse source to zero will not mean that they will be null, as that will be both a physical impossibility, and a machine problem — a low and a high cannot coexist in the same time. So, LTspice circumvents this by setting them to 10% of the Ton.