Linked Questions
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When/why would you use a Zener diode as a flywheel diode (on the coil of a relay)?
I have just been cogitating on the tutorial at http://www.electronics-tutorials.ws/io/io_5.html, and in the discussion of flywheel diodes it includes this sentence without further elaboration:
As ...
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7
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4
answers
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When a current flow in an inductor is interrupted, what limits the voltage rise?
When the current flowing in an inductor is interrupted the voltage will rise until (typically) there is a flashover or insulation breakdown in the switch. Assuming extremely good insulation what would ...
- 14.3k
6
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2
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Why would you bypass a zener diode in the flyback protection of a relay coil? [duplicate]
SparkFun sells a relay control kit that you solder together. On the back of the circuit board there is a pair of metal contacts that are labeled "bridge for zener bypass". I assume you put a small ...
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7
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5
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Can the inductive kick be discharged without a freewheeling diode, in this example?
In literature we commonly see the use of a freewheel diode to protect the circuit against the inductive kick when the switch goes from closed to open (Fig 1). However, what would be the pros/cons of ...
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4
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4
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Why do designers use a series diode and zener for coil suppression rather than just a zener?
I understand the use of the Zener but what I don't understand is one topology uses two components, but why can't the other topology be used ?
simulate this circuit – Schematic created using ...
- 12.1k
6
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3
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How do I calculate the decay time for an inductor and freewheeling diode?
How do I calculate the time it takes for the current to decay in an inductor when a freewheeling diode is used?
I've tried using just L/R but the result is never right when I simulate in LTSpice
Then ...
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1
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2
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Confusions with placing and sizing the flyback diode, TVS and Zener
I have couple of questions regarding the location of flyback diode and sizing and locating the Zener and TVS diodes. For example below at the far end there is a magnetic relay which is controlled by a ...
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How does flyback diode decrease the response time of a solenoid valve
Dear all StackExchange users,
I want to make a circuit consisting of 8 valves. Each valve has 55mH and 33 ohm. I want to control them with an Arduino board and a proper MOSFET. Valves reaction time ...
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4
votes
1
answer
758
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Check for if I've picked the correct flyback and zener diodes for a solenoid valve driver
I want to use an arduino power driver shield which contains the RFP30N06LE MOSFET to drive the 12V version of a solenoid valve which has a power consumption of 2.0 Watts (so 167 mA current draw I ...
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1
vote
1
answer
494
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Can I use a back to back Zener as a flyback diode for an AC coil?
I am using the below AC electromagnet to switch on/off a pneumatic system. (It is a pneumatic actuator. I think that is what it is called.)
The issue is, when I turn off (disconnect the switch) the ...
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1
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2
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Is it possible to repeatedly use a schottky diode at its surge current without damage
I've been working on a circuit with an inductive load and a MOSFET, but I'm having trouble finding a suitable freewheeling diode. If I choose a diode with a maximum surge current higher than the ...
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