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Questions tagged [transient-suppression]

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0
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1answer
41 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 (...
2
votes
1answer
69 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 ...
3
votes
1answer
139 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
68 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 (...
0
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1answer
96 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 ...
0
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1answer
153 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
105 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 ...
2
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0answers
72 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 ...
3
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1answer
134 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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0answers
77 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 ...
1
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0answers
83 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
82 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
256 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 ...
0
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1answer
67 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 "...
1
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2answers
148 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 ...
0
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1answer
140 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 ...
0
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0answers
33 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, ...
0
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1answer
553 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
144 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 ...
0
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2answers
507 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 ...
25
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2answers
6k 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
34 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 ...
1
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1answer
757 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
votes
1answer
234 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 ...
0
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1answer
101 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
74 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 ...
0
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2answers
114 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 ...
0
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2answers
678 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 ...
1
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3answers
609 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 ...
0
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3answers
926 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 ...
3
votes
1answer
953 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 ...
1
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1answer
189 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
357 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 ...
2
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5answers
3k 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 ...
0
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2answers
438 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 ...
2
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2answers
138 views

Ethernet surge and protection

I recently worked with a client who experienced a transient on their Ethernet cabling. As you can see, no actual PCs were damaged, only the Ethernet cards of some machines. We don't know where the ...
4
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1answer
2k views

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. ...
0
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1answer
354 views

Correct design for large contactor circuit?

After some advice here I'm wondering if this is the correct design of my circuit. I'm now using a SSR as the control device to the contactor. The diode, I believe, should not only protect the SSR ...
1
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1answer
743 views

Does this Schottky provide MOSFET transient protection?

I'm studying the schematic for an electronic load available as a kit from Jameco: http://www.jameco.com/Jameco/Products/ProdDS/2161107%20Schematic.pdf There is a Schottky diode shunting the source-to-...
3
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4answers
2k views

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 ...
3
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1answer
966 views

How do I model an over voltage spike on LTSpice? Any circuit example

I am doing project, I am trying to simulate an overvoltage/under voltage protection controller on LTSpice. How do I create overvoltage/unudervoltage on a source? For example a transient voltage spike? ...
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2answers
163 views

Are all snubbers interchangeale?

There are different kinds of snubbers that can be used. I know of 3, but there could be more. D RC RCD If an certain circuit uses a diode, can I swap it for an RC ? Or if a circuit has an RC, can I ...
3
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1answer
1k views

How to conduct “Transient Power” measurement according to ETSI EN 300 220-1 (v2.4.1)?

Background Info The company I work for builds Active RFID hardware that needs to conform to the regulations defined in ETSI EN 300 220 (Part 1). Our working frequency is 433.92 MHz. I am responsible ...
3
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2answers
351 views

Is a 9.6µs over-voltage transient long enough to fry my circuit (Details inside)?

I am designing a board for a 12V automotive environment, with a variety of input voltage transients including load dump and permanent 24V over-voltage. I am using a TVS at the input to clamp to around ...
8
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2answers
2k views

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 ...
3
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3answers
948 views

TVS specification understanding

I have some questions regarding Transient Voltage Suppressors (TVS). The specific datasheet I'm referring to is this, from 1SMB22AT3G. Here is some of its specs: \$V = 22V\$ \$V_c = 35.5V\$ \$I_{...
3
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2answers
2k views

How to suppress current spikes in transistor feedback loop

I am trying to pulse a load with a small constant current pulse (2mA @ 500us). The load does unfortunately have an unknown capacitance in the range 10nF - 1uF, parallel with an unknown resistance ...
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2answers
559 views

Surge suppression for electric motor

I have a 4.2W 12V electric water pump connected in series with a water float switch as a sump pump, powered by a 1A 12V DC power brick. The switch has a maximum switching voltage rating of 100V. ...
2
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2answers
2k views

Transient Voltage Suppressor (TVS) Diode Array

I am having a hard time understanding this logic. Please bare with me if my question is very basic. I would appreciate if someone can explain what is happening? If I look into any typical TVS IC data ...
5
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1answer
369 views

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 ...