Electrical Engineering Stack Exchange
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Questions tagged [transient-suppression]

For questions about suppressing transients (whether voltage, current, etc.). Consider using in conjunction with related tags such as "protection", "over-voltage-protection", and "tvs".

For questions about suppressing transients (whether voltage, current, etc.). Consider using in conjunction with related tags such as , , and .

113 questions
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How to decide between a TVS or Zener diode for overvoltage protection?

I'll leave my specific circuit out of this for a more broad question: What criteria does one use when deciding whether to use a Zener diode or a transient voltage suppressor, for overvoltage protection on a particular application? Also when would…
JYelton
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2 answers

What is an "XY" rated safety capacitor, exactly?

Please help me understand this. In a prominent, 480v, 6kW AC servo drive, across three input phases, three 22mm "XY" class 10nF caps are placed for EMI suppression. Also, from these three phases, three of the exact same "XY" caps go to chassis…
rdtsc
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24
votes
3 answers

How to limit inrush current?

I'm designing a device powered from USB. The device uses FTDI FT2232 chip for USB connection. Upon a command from a computer FT2232 chip should enable power via a MOSFET switch to rest of the circuit. This additional circuit has a capacitance of…
ibiza
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11
votes
2 answers

Flyback diodes issues and pull-in & hold current issues in this Relay circuit

Although this may be a basic question but I'm still struggling with it. In this schematic, two zener diodes D1 and D2 are connected back-to back across relay coil L1. The BVds = -30V for Q1. Can I use 15V(Vz = 15V) zeners for D1 and D2 instead of…
jacks
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10
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4 answers

How to shunt 1500 joules when voltage exceeds 75 VDC

I have an alternator that charges at ~58 V at 100 A. If its load (a lithium bank) cuts out suddenly (bms cutoff), I need a way to shunt power for 200 ms to a dummy load to prevent the current from falling to 0 A and voltage spiking to 230~280 V…
VanGogh66
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10
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What are bidirectional Zener diodes used for in DC transient protection?

I often see two zeners (in opposition to each other) being placed across the power supply rails. I don't understand why that is necessary. For example, if I have a 16V Zener diode and a 12V power rail, the 16V Zener will protect the supply from…
cksa361
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9
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2 answers

Transient voltage suppression diode not doing its job

I have a circuit which works on 21V DC and draws 3A maximum current. I need to get it tested to IEC 61000-4-4 and 61000-4-5 standards which are surge immunity tests. I use a UL certified switch mode power supply to power my unit. The supply…
mic
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7
votes
1 answer

Help tame turn-on transient

I'm working on a dual headphone amplifier. I've discovered that it has a pretty bad turn-on transient that results in a loud pop if headphones are plugged into the amplifier when it is turned on. The split positive and negative rails rise very…
strobot
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7
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3 answers

Coil suppression: Zener + diode: how to minimize the negative voltage?

I have come across these two app notes: Coil Suppression Can Reduce Relay Life Application of Coil Suppression with DC Relays Both of them agree on the fact that a common diode + Zener diode in series is the best solution for spike suppression all…
VoltsAndNuts
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7
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3 answers

How to properly snub transient spikes from a transformer and prevent switch mode power supply burn out

I've received a failed switch-mode DC-DC step down converter (part# LTC3631 from Linear). This circuit was driven by a 24VAC transformer which is rectified on the circuit: simulate this circuit – Schematic created using CircuitLab The leads from…
MandoMando
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7
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1 answer

How to choose the correct TVS diode and how to size it?

So I was thinking about transient suppression and I found TVS diodes. I was wondering how to choose the correct TVS diode since they have 3 voltage parameters: Vc --> clamping voltage, voltage I think you want to cut the transient spike. the…
Suvi_Eu
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7
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1 answer

Clamping Inductive Kickback in AC Circuits

I want to eliminate/clamp the inductive kickback that would result from turning off a large inductor, such as a relay or a transformer. In a DC circuit, I would use a diode to flywheel the current. But what do I use in a line voltage AC circuit? Is…
mcu
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5
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2 answers

Long supply line and capacitor to prevent voltage drop

I have a 30 feet line with DC supply 12 V. A motor on the end draws about 0.5 Amps initially (100 ms). It's logic shuts down because of the line's voltage drop caused by inrush current. A capacitor of 1000 uF prevents the shutdown. However, if I…
user2752
5
votes
1 answer

Current-sense for NES/SNES gamepad detection - getting a voltage spike

I'm in the process of designing a wireless controller receiver for the NES/SNES game consoles. My wireless receiver consists of a bluetooth module and an AVR microcontroller, with the microcontroller connected to the controller's control lines. …
qwertymodo
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5
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Regarding ESD diode's architecture

I need one clarification regarding ESD,EFT and SUrge protectors. Different manufacturers have architectures of diodes+Zenar diode combinations for different protection levels for different interfaces. I am attaching a figure which shows 2…
user19579
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