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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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 (...
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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 ...
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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,...
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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 ...
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Transient protection (TVS), for back to back N-channel MOSFET switch with user-accessible connections?

I am designing an electronic power switch device which can be placed inline between a power source and a load (e.g. a charger and a battery, or a battery and a load). It needs to be biderectional (i.e....
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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 ...
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2 votes
1 answer
266 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 ...
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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 ...
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3 votes
3 answers
135 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 ...
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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 ...
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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 ...
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3 votes
1 answer
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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/...
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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 ...
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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 ...
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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 ...
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1 answer
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Calculate measurement accuracy of voltage divider with suppressor diode?

I have a voltage divider to measure the voltage in a DC Bus. I parallel to R1 I have a suppressor diode (D1) to protect the input of the microcontroller from transient overvoltages. This diode has a ...
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2 votes
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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 ...
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6 votes
1 answer
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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 ...
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3 votes
1 answer
197 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 ...
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1 vote
1 answer
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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 ...
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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 ...
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1 answer
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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 ...
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1 vote
3 answers
64 views

How does increasing the duration of the transient response become a problem?

I'm looking at the TI TPS727 LDO regulator datasheet and it says this: 8.2.1.2 Transient Response As with any regulator, increasing the size of the output capacitor reduces over- and ...
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1 answer
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MOSFET and TVS Voltage requirements for 120V single phase AC circuit

I am designing a circuit that will gate single phase 120V AC through back-to-back N-channel MOSFETs connected as shown below. When passing AC, one MOSFET is on and the body diode in the other is ...
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3 votes
1 answer
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Placement and values for ferrite bead/capacitor ESD protection / transient suppression filter

I've been researching but found it difficult to find a clear answer on this. I need to add ESD protection to my circuit, in this Texas Instruments video it talks about combining a TVS diode with a FBC ...
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How do I suppress this voltage spike/dip?

I have a system that's currently testing automotive brushed dc motors. Occasionally, I'm getting interruptions in my data acquisition system that I believe is being caused by transients coming from ...
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1 answer
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Overloading of ESD protection diode on CAN lines through current during Bulk current injection - test

I have a design checklist question for a typical CAN circuit for an automotive application as below : The question is related to the ESD suppressor : "Was a capacitor parallel to the diode considered, ...
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Help needed for HV DC/DC converter

I need to design a boost converter that outputs ~20 mA DC and an unloaded voltage of around 68-100 V. The inverter will be part of a Zener diode analyzer. I built it on the idea of the Joule thief (...
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2 votes
1 answer
735 views

Interpretation of EN 61000-4-5 Surge requirement on a DC Power Port

I am trying to understand how to treat the DC power port on my industrial device (read: will be used in CNC machine shops and industrial processing plants and the like) should be tested according to ...
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4 votes
2 answers
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What is a typical reverse recovery time for a Zener diode, or is reverse recovery time not applicable to Zener diodes?

A little background: I am trying to understand how Zener diodes respond to high voltage transients. I stumbled across discussions of reverse recovery time, and I'm curious how it applies specifically ...
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0 votes
3 answers
263 views

Surge or other suppressor I can use, to prevent tool blowing fuse if blade sticks [closed]

I want to say up front, that this question involves minor modification (transient surge/current suppression) to the power supply side of a power tool. Usually I'd be the last to do anything like this (...
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1 answer
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Reverse Polarity and TVS Diodes Not Working?

This is a follow up to this issue: Damaged TPL7407LA Transistor Array (*Updated With Scope Testing Images*) We are experiencing both reverse polarity and transient voltage spikes in our automotive ...
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1 vote
1 answer
828 views

Calculating energy of transient/surge handled by metal oxide varistors (MOV) or surge suppressors?

As I get to know more about the MOV operation, there are more things needed to understand. My MOV (V420La20AP) has Varistor voltage of 680 Vrms (10%) at 1 mA, and maximum clamping voltage of 1120 V ...
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0 votes
3 answers
443 views

The circuit-level "why" of the loudspeaker / amplifier “POPP” sound

in the other question about the "popp" sound I asked if the "popp" is harmful to a loudspeaker. Since I am also interested in the "why" on the circuit level, here is my next question. I put this ...
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2 votes
0 answers
247 views

High power / high current clamping circuit

I am looking for ideas on how to clamp high energy surges in the input of a high current / high power system. The input to the system is 24V. During steady state, the system sources 85A of current ...
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4 votes
1 answer
372 views

Suppressing "travelling" EMI spikes

I am working on a circuit with a AC to DC power supply module and wireless MCU module. The MCU operates at 240MHz and on the power input to the module there are 2 x 0.1uF capacitors and a 22uF ...
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1 vote
1 answer
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Transient Response Suppression

In my project i am using an ultrasonic transducer. The transducer has a high Q-factor so that it's zero input transient responses decay rate is quite low and i am suffering from that because the ...
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1 vote
0 answers
231 views

TVS protection burnt too easily

It's about an year that I'm using TVS diodes to suppress spikes from the AC motors (240V - max 240W) that drives my roller shutters and protect the solid state relay that actuate the motor. What is ...
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3 votes
1 answer
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Transient Current Effects from Independent Charging Circuit

I've been working to automate a household appliance. The device is normally controlled by a switch that must constantly be depressed in order for the device to operate. Instead, I replaced this ...
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0 votes
2 answers
568 views

Transient voltage noise in 240 V AC mains detection circuit MSP430FR2311 gets RESET

I am detecting 240 V AC mains using optocoupler. Here is my circuit. When I am doing this my microcontroller resets every time I on/off the 230V AC circuit. I've seen response of the on & off ...
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