Discharging problem of a turn-off snubber circuit

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SUMMARY

The discussion focuses on the functionality of turn-on snubber circuits, specifically addressing the confusion surrounding reverse voltage induction in inductive loads during switch turn-off. The participant references a specific snubber circuit from a university resource and contrasts its described purpose of delaying voltage with their textbook's assertion that it delays current. The participant also notes that a different circuit is required for snubbing during turn-off, emphasizing the need for clarity in understanding these components.

PREREQUISITES
  • Understanding of snubber circuits and their applications in electrical engineering.
  • Familiarity with inductive loads and the behavior of voltage and current during switching events.
  • Knowledge of diode functionality in circuit protection and current flow management.
  • Basic principles of circuit design, particularly in relation to turn-on and turn-off processes.
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  • Research the design and application of turn-on snubber circuits in power electronics.
  • Study the differences between voltage and current delay in snubber circuits.
  • Explore the design requirements for turn-off snubber circuits and their components.
  • Learn about the role of diodes in snubber circuits and their impact on circuit behavior.
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Electrical engineers, circuit designers, and students studying power electronics who seek to understand the intricacies of snubber circuits and their operational differences during switching events.

yykcw
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I am referring to the turn-on snubber on page 5 of the following website:
http://www.engr.usask.ca/classes/EE/443/notes/Snubber_Circuits.pdf
I want to ask when the switch start to turn off, isn't that there will be a reverse voltage induced in Ls? Then, the voltage across the switch has to be larger, does it really make sense? If the diode across the current source can share some voltage then it will be reverse bias and all current from the current source will flow to the switch which I think is not reasonable.
Moreover, this website saying the turn-on snubber is to delay the voltage, but my textbook tell me it is to delay the current! Why there will be a difference? I am really confuse right now.
 
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Could you attach a jpeg? I can accommodate only jpegs.
 
The turn-on snubber is designed to reduce the current turn-on voltage. It is a partial circuit.
If you want to snub turn-off also you will need to use a different circuit.
Turn_On snubber.jpg
 

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