Questions tagged [transient-suppression]

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21 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 ...
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1answer
50 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 ...
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1answer
37 views

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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0answers
29 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 ...
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1answer
216 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 ...
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1answer
100 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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39 views

Rc filter to ground

On one of the machines I'm working on we have a cabinet that ties parallel resistors and capacitors to a machine ground. The cabinet is in parallel with the machine's main transformer and the ...
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1answer
143 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 ...
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1answer
74 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 ...
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1answer
65 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 ...
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3answers
52 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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1answer
68 views

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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1answer
533 views

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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63 views

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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1answer
306 views

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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1answer
53 views

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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1answer
285 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 ...
4
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1answer
498 views

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'm 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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3answers
122 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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1answer
254 views

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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1answer
431 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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3answers
203 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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0answers
121 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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1answer
254 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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1answer
142 views

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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0answers
155 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 ...
3
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1answer
90 views

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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2answers
390 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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1answer
90 views

What is the optimal protection diode placement driving a relay

In any circuit where a transistor or FET is driving a DC relay, its common to see a reverse blocking diode added to suppress the inductive spikes, caused by fast current transitions (particularly the "...
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2answers
230 views

NE555 Controlled Transformer Voltage Spikes

I am attempting to build a NE555 timer controlled step up transformer (3:250). R2 and R3 will be variable resistors when it is completed. Input is 12V and I'm stepping that up to about 1000V. The ...
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1answer
207 views

Preventing power supply startup transients

I am trying to build a huge array of WS2812b's and the wiring is all done. Now, I am in the process of installing it into it's final destination. However, I have read that these WS2812b LEDs are very ...
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0answers
49 views

Water pump, PSU and surges

I've got a home-built watercooler that I've been using for more than a decade on my personal PC. The unit has a single switch for the AC mains (120V 60hz) that splits to power both the AC waterpump, ...
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1answer
1k views

EFT and ESD test failed

My company recently sent a product to undergo EMC testing. The product had passed all the tests except EFT and ESD. Somehow my company ask me as a fresh grads to solve it. TT. I really don't know from ...
3
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1answer
281 views

TVS protection negative going ESD event

I want to protect an 12V input from ESD events. The allowed input voltage range is 0V to 12V. I could use a unidirectional TVS diode for that purpose but my colleges suggest to use a bidirectional ...
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2answers
1k views

What is transil and how it works?

Can anyone tell me how transil works and what its purpose is, because I can't find information? Thank you! What is the purpose of Z1 and Z2 and when they work? Input voltage is 230V AC and the ...
28
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2answers
10k views

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, ...
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0answers
35 views

How does an autoradio suppress transient, switching “plop” generated by an external audio source?

Out of curiosity I'd like to know how an autoradio device works. Maybe it' not how they all work and my case is just an exception but here it is. I have a car TV tuner that is used to switch between ...
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1answer
1k views

Determining Dynamic Resistance of TVS Diode from Datasheet

I'm trying to determine the dynamic resistance of TVS diodes so I can calculate clamping voltage and peak current for a given input pulse (automotive load dump). This app note(1) from ST provides a ...
2
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1answer
304 views

Are TVS diodes a good mechanism to reduce specific kinds of electrical noise?

This specific application relates to small racing quadcopters, which have their own design constraints, but hopefully it's applicable on a larger scale. Certain brands of BLDC ESCs are very popular ...
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1answer
151 views

How to minimize high dV/dt device wich is connected to analog electronic load

I designed an Ac electronic load and tried to connect it to a switch mode half bridge (for testing purposes)as can be seen in the figure. Since the switch mode half bridge has high dv/dt output ...
0
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1answer
86 views

How to protect the enable signal (EN) of a car battery powered device?

I am developing an electronic circuit that will be installed in a car and get its power from the car battery. The circuit will use around 600mA. The device should be turned on when the car ignition is ...
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2answers
173 views

Dissipate quickly an inductance energy

The desirate goal here would be to apply a current throught a weak inductance (< 60µH) at at least 500kHz and producing as much as possible a square current figure. To do so I have to dissipate the ...
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2answers
1k views

TVS diode for surge protection: how does it works beyond Ipp point?

I need to protect the schematic from the surge transient voltage 1.0 kV 1.2/50 us (standard surge model). To accomplish this I planned to use two SMBJ200CA TVSs in series at the input and make all ...
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3answers
736 views

Decoupling Capacitor (High Frequency Spike)

Wondering if anyone could help me rectify my understanding of decoupling capacitors and their role in suppressing high frequency voltage spikes (particularly increases in supply voltage). Similar ...
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3answers
1k views

DC Bus Conditioners in VFD Drives

In VFD Drives, DC Bus conditoners are used to protect the DC link supply from transients. Can you please let me know the different scenarios DC Bus of a VF Drive gets these transients and their ...
2
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1answer
1k views

Transient protection to prevent microcontroller freeze - Selecting MOVs and TVS diodes

I have a circuit which contains an offline switching SMPS circuit (based on viper22a) converting 220V to 5V regulated down to 3.3V using linear regulator IC. This powers up an ESP wifi module and ...
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1answer
247 views

Are voltage transients on LTspice simulations significant?

I (incorrectly*) modeled this simple answer in LTspice IV and am seeing seemingly random instantenous voltage spikes up to +/-1kV on the output of the depletion nMOSFET. Are these real? If so, are ...
3
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1answer
417 views

Where to put a spark gap for ESD protection--to an isolated “GND” or to protective earth?

I am designing some PCBs for a system that runs on a fully-isolated DC power supply. I have three power inputs: Protective earth (connected directly to the line earth of a three-pin US 120V AC power ...
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5answers
4k views

How to remove spikes from switching transistor?

I am building a steady current source which delivers steady current (0-20mA) to an LED. The brightness of the LED (current) is controlled through a potentiometer's voltage and a voltage follower as ...
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2answers
547 views

Spark Suppressor Question

I built a timer for my water heater and have a question about spark suppression. I am using a 120v house timer 1875W to operate a Packard (240B) 2 pole 40A 120v coil relay. The output of the relay ...