Talk:Flyback diode

message: I think those articles are just about the same thing, whereas this one is a little bit more elaborate. --sdschulze (talk) 16:32, 12 May 2008 (UTC)
thread_title:  Merge with Free Wheeling Diode 

message: diode D in series with Induct. L then switch S?  —Preceding unsigned comment added by 213.55.92.50 (talk) 13:32, 12 February 2009 (UTC)
thread_title:  pls tell me the function of diode in series with inductor and switch like.. 

message: The derivation section of this article refers to a circuit and components that are never shown and identified. Someone who thoroughly understands the subject would have no problem imagining the circuit and component locations. But presumably the article is written for someone without thorough understanding.  —Preceding unsigned comment added by WithGLEE (talk • contribs) 16:26, 18 August 2010 (UTC)
thread_title:  Derivation section of article. 

message: Flyback without a resistive path cannot create an infinite voltage. Radiation losses take over.  — Preceding unsigned comment added by 76.176.189.220 (talk) 21:49, 6 August 2012 (UTC)
thread_title:  No infinite voltage 

message: The green arrow illustrating flow from the inductive kick is going in the wrong direction.
Purplephlogiston (talk) 01:56, 17 February 2014 (UTC)
thread_title:  Figure 2 diagram 

message: I am fairly sure that the term "flyback" comes from the appearance of the phenomenon in cathode ray tube driver circuits. In the horizontal deflection circuit, as it commands the rapid "fly back" of the electron beam to start a new scan line, the magnetic deflection coils must quickly reverse their magnetic field. The energy from the coils, produces a large current pulse that is used in the high voltage "flyback" transformer to generate the anode voltage for the CRT.
Am I wrong on this origin?
Gwideman (talk) 17:15, 11 May 2014 (UTC)
thread_title:  Origin of "Flyback" term 

message: The lead currently states:
:: A flyback diode (sometimes called a snubber diode, commutating diode, freewheeling diode, suppressor diode, suppression diode, clamp diode or catch diode) is a diode used to eliminate flyback, which is the sudden voltage spike seen across an inductive load when its supply voltage is suddenly reduced or removed.
The definition is too simple and the various names oven imply subtle differences.
A fluxed inductor will exhibit a flyback voltage spike when the current is interrupted. Diodes are often used in the presence of these spikes, but those diodes can have different purposes.
Some diode circuits are placed across the inductor; other circuits are placed across the switch.  Some circuits are designed to quickly dissipate the inductive energy, some intend to keep the inductor current flowing, and others are designed to recover the stored energy. In still other circuits, the diode's function is not to suppress the flyback but rather isolate the capacitor which collected the inductive energy.
Snubbers and suppressors are usually focussed on protecting the switch. For mechanical contacts, their purpose is to prevent arcing. They often consist of more than just a diode.
Clamp diodes are usually associated more with setting a voltage rather than tackling the inductive spike. Clamp diodes are used with capacitors in logic switching circuits. In the flyback regulator context, the clamp diode can be used on the primary side to set the secondary output voltage. The low efficiency version uses a zener diode as a shunt regulator. The high efficiency version uses a clamp winding and returns the energy to the power supply. In the flyback switcher, the flyback is desired; the goal is not to snub or suppress or eliminate the flyback.
The typical reverse-biased diode across inductor can suppress the flyback, but it keeps the current flowing with little loss. The circuit is a problem when trying to turn the magnetic field off quickly. A zener or a diode-resistor combination will speed the field collapse.
Zener diodes can be used as suppressor diodes. In that circumstance, the energy is being removed quickly by dissipation.
Freewheeling diodes provide reverse current paths to keep the current going. In simple applications, it can be viewed as the same a flyback protection diode, but there are more subtle uses. (See figure 5 where unidirectional IGBT with freewheel diode looks like bidirectional short.)
Glrx (talk) 03:16, 25 March 2016 (UTC)
thread_title:  Terminology 

message: The reference supplied was never offered to be a reference for all the terms offered in the article.  It was clearly identified as an example of the use of 'catch doide' and in that it succeeded.  I agree that references supporting the other terms are required.  --Elektrik Fanne 13:49, 25 March 2016 (UTC)
replies: text: My edit comment also stated that the reference was not authoritative. It is just a text reference, there are no diagrams, and the statements cannot be verified.  Some statements are also wrong: "Usually, a 'catch' diode would be placed across the inductive solenoid to safely dump power from the spike into the power supply’s ground return."  The issue is energy rather than power. The energy gets converted to heat in the diode and the solenoid rather than being dumped into the supply's ground return. There are other confusing remarks. Glrx (talk) 18:23, 25 March 2016 (UTC)
thread_title:  Reference for catch diode. 

message: Current is the flow of electrons. Voltage is a difference of electrical charge, and is the reason that current flows in a specific direction (if at all). In DC current, the negative side of the battery has an abundance of electrons, giving it a negative charge, while the positive side of a battery has a lack of electrons, giving it a positive charge. When connected to a circuit, electrons flow from the negative side of the battery through the circuit to the positive side of the battery.
In the article, it says "Current is flowing "down" from the positive terminal of the voltage source to its negative terminal, through the inductor.", which is incorrect.
Additionally, the green arrows in the illustrations indicating the direction of current flow are pointing in the wrong direction. 
Regarding a diode, here is how I remember which direction a diode will allow current to flow:
Current can flow in the opposite direction of the arrow, but current attempting to flow in the same direction as the arrow hits a wall and is stopped.
12.131.93.13 (talk) 19:46, 15 December 2017 (UTC)
thread_title:  Incorrect information in article relating to direction of current flow