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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".

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Problem: Transient Voltages in Grounding Circuit Cause comms loss

I am working with a Hipot unit to break down a DUT. The Hipot is powered by an independent 220V Ckt. In my test setup I have a PC and another unit, both of these are powered from separate 120V ...
Juan Antonio's user avatar
2 votes
1 answer
75 views

What does back-back mean in the context of TVS diodes?

I am making the schematic of a 24 V power supply regulator using the LM74900-Q1 IC. When selecting the TVS diodes, I found the following design suggestion in the datasheet of another IC (LM74800-Q1) ...
Luis J. Mora's user avatar
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0 answers
17 views

Standards/Insight into Transient Protection of Industrial/Construction Equipment

I am designing a device that will be connected to the 12 or 24V battery of certain construction and industrial equipment. I'm aware that because these are industrial vehicles/equipment we will need ...
Andy M's user avatar
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2 votes
1 answer
127 views

How to avoid transient voltage spikes when powering up a device?

I'm using the linear regulator LP2985-50 from TI to power a set of op amps (NE5532). The op amps provide an analog signal to a component that is very sensitive to overvoltages. Upon power up, I first ...
oscar garcia's user avatar
3 votes
1 answer
746 views

How to properly model biased photodiode circuit with cross-talk

The overall goal is the following: I need a board with two photodiodes, each with a bias tee (cutoff around 70 MHz) connected to it, for a total of 4 outputs. The photodiodes will see short pulses, ...
EENovice's user avatar
0 votes
1 answer
107 views

Protecting other circuits from Geiger power supply

I'm designing a Geiger counter power supply that boosts 3.3 V to 500 V. The circuit is a basic voltage booster. 3.3 V power line is directly connected to inductor where high voltage is generated. How ...
zerobeat's user avatar
0 votes
0 answers
48 views

Arc jumping from high resistance to low resistance path

Trying to make sense of how to cut current on a high-voltage system without turning everything into plasma. Specifically, I'm wondering whether you could reduce the current by going gradually (but ...
VoltsAndNuts's user avatar
2 votes
0 answers
133 views

Overvoltage Clamping protection for Boost Converter

I think my circuit is failing because of ESD and/or transients when initially connecting my device to a supply. How should I go about protecting the gate of M1? What's the best way to clamp the ...
Zachary Anderson's user avatar
1 vote
0 answers
232 views

Specifying a TVS to protect against inductive spikes

I'm choosing a transient voltage suppressor to absorb the freewheeling current from a 1mH inductor in the rare situation the output of a SMPS is disconnected during load. simulate this circuit –...
James Fotherby's user avatar
0 votes
1 answer
89 views

Is this component correctly used?

So, There is this schematic that a previous collegue made for a project that I took over that have some EMC problems (Burst/EFT). The problem is that 12V on the secondary side of the transformer(not ...
aaq's user avatar
  • 131
0 votes
1 answer
279 views

Difference between D, D+Z and TVS for inductor surge suppression

Let's say I have a switched inductive load (e.g. a lift/hold electromagnet, electromagnetic actuator, or relay coil). IIUC, when the switch/EMR/SSR opens, the collapsing magnetic field can cause the ...
Matthew's user avatar
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7 votes
3 answers
731 views

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 ...
VoltsAndNuts's user avatar
2 votes
2 answers
145 views

Active adjustable voltage limiting circuit

I'm looking for a circuit that can clip the peaks of a sine wave source, typically the source is 40 V peak to peak and should be clipped at about 13.8 V. The circuit below does exactly this but to my ...
Ne3M's user avatar
  • 53
0 votes
0 answers
45 views

Vehicle power vs Li-po battery power: ground potential difference

I have a device that needs to plug into automotive power (via the OBD-II connector) and also has a Li-po battery so it can continue to run for several hours after being unplugged. Additionally, for ...
bgp's user avatar
  • 273
0 votes
2 answers
115 views

How to protect a high-voltage output stage from very high transients

Usually in electronics, one can use MOV or TVS diodes to get rid of voltage transients. That's because most applications run at a voltage of 500 V or less. But assume I want to protect the output ...
MikeTeX's user avatar
  • 1,898
0 votes
3 answers
1k views

How to avoid voltage spikes from solenoid valves?

I want to control a solenoid valve (24VDC, ~10W) using an ESP32 MCU. My initial approach to do this was to use a GPIO pin to control a transistor, which again should control a coil relay. This coil ...
eidetech's user avatar
4 votes
1 answer
812 views

ESD protection only with a common mode choke

In general, for a successful CAN/CAN FD communication one needs protection against ESD pulses and common mode noise. Most of the time the protections are made by TVS diodes and common mode choke (see ...
THz_Tim's user avatar
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1 vote
1 answer
326 views

Automotive ISO 7637-2 transients and LT4363 surge protector chip

Can this part be used for the +150V / -220V transients in the ISO? Taking this diagram: And modifying it to this: Where the IXFP60N25X3M is a 250V capable N_MOSFET and R_sns = 5 mohm for 10A max. ...
kellogs's user avatar
  • 1,061
1 vote
1 answer
410 views

Picking TVS and ferrite beads for MCP9600 thermocouple converter

I'm about to use the MCP9600 thermocouple voltage to I2C converter for the first time. Because I need my output to be as precise as possible, I decided to apply the recommended circuit shown in figure ...
drydre's user avatar
  • 75
2 votes
1 answer
977 views

Mitigating FET current spikes in an SMPS buck converter

I'm currently designing an SMPS buck converter that converts 311VDC to 60VDC at 10 Amps maximum load. I'm using ESP32 for the PWM control, and IR2110 for the switching driver. The switch I'm currently ...
Kevin's user avatar
  • 101
0 votes
1 answer
127 views

ATmega freezes because of power supply

I'm using a 10W/12V PCB mount SMPS for a project. In the same board I'm using an ATMEGA2560. When there is a power fluctuation, the ATmega freezes and all the communication is halted. How can I fix ...
Lex's user avatar
  • 71
1 vote
1 answer
386 views

how does AC coupling eliminate the ground current problem between data source and destination in FPD_Link II I/F?

Reading about FPD-Link II in Wikipedia, I came across this statement for which I need clarification: Because the signal is DC balanced the application can use AC coupling, which eliminates the ...
jrive's user avatar
  • 639
0 votes
0 answers
255 views

Noise suppression circuits for a 120VAC motor

I am building a circuit for a relay that controls power to a 1000 watt pump motor. I want to do what I can to reduce noise and failure of the circuits from transients etc. Here is my schematic: I ...
notsolowki's user avatar
0 votes
0 answers
193 views

Switching Transient Protection For ADC Pin

I am playing around with one old transformer. I am trying to use it in combination with voltage divider to get AC 230V main into DC range (0-3.3V) suitable for ESP32 ADC input. I build circuit for ...
moci's user avatar
  • 97
0 votes
1 answer
461 views

How to protect high-speed SPI from ESD

I want to use the following screen with an ESP32 IC. The screen is controlled via SPI. I want to know how do I prevent ESD from damaging the ESP32? I have created the following schematic, which uses a ...
JoeyB's user avatar
  • 2,391
0 votes
0 answers
158 views

Current flow in PWM brushed DC motor drive

I am driving a brushed DC motor (Cytron gear motor) using a gate driver (SN754410) to do PWM motor speed control. My expectation I expected a triangular current wave, ramp up when PWM on, ramp down ...
EdL's user avatar
  • 182
2 votes
2 answers
616 views

Microcontroller Power Transient Voltage Spike

First of all thanks for even taking your time to read this question. We are hoping someone can help assist us with an issue we have been having. We are currently working on an automotive tail light ...
jacob80's user avatar
  • 31
10 votes
4 answers
2k views

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 ...
VanGogh66's user avatar
  • 301
0 votes
0 answers
437 views

How to best protect 12V from voltage transient spikes?

I am building an AC power supply and I decided to put digital current and voltage panel meters into it. I have an issue where whenever my main contactor engages and disengages, there is a transient ...
Ranger's user avatar
  • 1
2 votes
1 answer
547 views

How to prevent transients when switching off a transformer

I have built a vacuum tube amplifier. Its power supply consists of a transformer, a vacuum tube rectifier and choke input filter. Everything works well, except that sometimes when I turn it off (...
Pentium100's user avatar
  • 6,630
3 votes
4 answers
2k views

Why a low pass filter across relay contacts instead of a high pass filter?

I have found a snubber, it is a low pass filter. It doesn't make sense to have a low pass filter across the contact. I would consider transients such as arcing to be high frequency; therefore, a high ...
Sam 's user avatar
  • 319
3 votes
2 answers
5k views

Supply turn-on voltage spikes - best practices for protection

The problem I recently had a situation where a board had a destructive fail event from turning on a 53V battery which appeared to have had a voltage spike at least over 80V, most likely well over 100V,...
KyranF's user avatar
  • 6,313
0 votes
1 answer
62 views

Low Current (<500mA) Transient Current Suppression Methodologies

I am looking into possible methods of protecting against small current transients for use with a laser module and am having trouble finding information, partly because I am unsure what exactly to be ...
snowmanemperor's user avatar
0 votes
0 answers
466 views

How to combine transient voltage TVS diode and overvoltage Zener diode for analog output?

How do I arrange my circuit so that the TVS diode can do its ESD/transient job, without being fried in the miswiring/overvoltage scenario? I have an analog 0-5V output that needs protection from ...
Jonathan Hale's user avatar
2 votes
1 answer
695 views

Overvoltage protection when going from 24V AC to 3.3V DC

I'm trying to wrap my head around transient voltage protection and how to implement it when also trying to rectify a AC source to DC then step it down to 3.3V for a microcontroller. I understand that ...
Ezzy C's user avatar
  • 23
0 votes
0 answers
183 views

Automotive 24v TVS suppression Question & feedback

Iv been contemplating which approach for voltage suppression for a 24V system. the parts in consideration are RBO40-40G// TPSMD20A || TPSMD251A// PNS40010ER,115 Load Dump for the one on the top ...
lolbardsnin's user avatar
3 votes
3 answers
181 views

New type of TVS diode - where do I find one, if it even exists?

I've been looking at various TVS's and recently came across one I'd never seen before: This particular part is used by Citel for a transient suppression, and concluded that this part had been ...
User Hostile's user avatar
0 votes
0 answers
119 views

Transient voltage supression for high voltage Thyristor or Avalanche TVS

I am making a high voltage 240 VAC 60Hz voltage measurement front end and is in need of a transient suppression device. According the a table in wikipedia. Avalanche and Thyristors are the only ...
Jake quin's user avatar
  • 1,944
0 votes
1 answer
349 views

How to extend optocoupler's common mode transient immunity to its Input constant current driver

Hello planning to use an optocoupler to interface a button meters away from the circuit. The optocoupler ILx series already comes with Common Mode Transient Immunity which would work great for my ...
Jake quin's user avatar
  • 1,944
3 votes
1 answer
549 views

Protecting circuit input against lightning - how to put all the pieces together?

I am designing a single wire (ground return) telephone for use in our hobby caving expeditions, starting out from a well known and successful design called Michiephone (http://speleonics.com.au/...
Mateusz's user avatar
  • 31
1 vote
0 answers
127 views

Automotive Load-dumps, ISO standards & Meaning behind datasheet

Im looking towards using an system basis IC for one of my designs (UJA1164A) and i noticed that under the features & benefits it notes that "Battery and CAN bus pins protected against ...
lolbardsnin's user avatar
0 votes
1 answer
436 views

Transient Voltage Suppression Diode with no current limiting component

BATT= 16V 27V Rated TVS Diode spec - TVS Diode Datasheet The circuit : My questions: I want to understand what happens when the BATT voltage goes above the TVS diode clamping voltage. For both ...
user avatar
0 votes
1 answer
312 views

Where to connect TVS clamping Diodes

This question just came up during the review of a design. Should the TVS rather be placed before the feedthrough-cap or after? I would place the TVS before the cap (see A in schematic) because TVS ...
Jogitech's user avatar
  • 760
0 votes
3 answers
381 views

Calculate measurement accuracy of voltage divider with suppressor diode

I have a voltage divider to measure the voltage in a DC bus. Parallel to R1 I have a suppressor diode (D1) to protect the input of the microcontroller from transient overvoltages. This diode has a ...
ErnstOlch's user avatar
  • 177
2 votes
1 answer
329 views

Ethernet Link is going down while applying EFT pulses on Power Port

We have conducted our system for EFT test as per IEC-61000-4-4. We have applied EFT on the AC side of the AC-DC power supply. We are using the power supply HWS50A-12/A from TDK-Lambda. As per the ...
shafeeq's user avatar
  • 172
8 votes
1 answer
10k views

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 ...
Suvi_Eu's user avatar
  • 851
3 votes
1 answer
246 views

Can spike voltage transient at input gates during control signals switching be avoid?

I have to say that this circuit is mounted over a protoboard. This is a probe scenario. I have a logical circuit where Vin = 12V and sometimes this control signals must switch to 0V and from 0V must ...
Suvi_Eu's user avatar
  • 851
1 vote
1 answer
350 views

Mechanical Switch Causes Transients from AC-DC Power Supply

I'm having trouble getting rid of output transients from this Mean Well PSU right after the AC input is switched. https://www.meanwell.com/Upload/PDF/RPS-500/RPS-500-SPEC.PDF The PSU is a RPS-500 ...
mrbean's user avatar
  • 812
0 votes
1 answer
266 views

Limiting voltage transients with a TVS diode

My goal is to suppress transient voltage spikes from damaging the 5V, 600mA Step-Down Voltage Regulator D36V6F5. I believe the transients are a result of high inductance in the wires between the power ...
andrey's user avatar
  • 504
0 votes
2 answers
331 views

Suppressing Transient Voltages - DC circuit

I have a DC circuit with a 24-26v voltage source (from a battery). The secondary function of the circuit consists of 2x step down converters, 1x to 5v and 1x to 12v. The step down converters are ...
Pedwards82's user avatar