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Questions tagged [spike]

For questions about electrical transients of very short duration (whether voltage, current, etc.), which may cause damage to electronics that are not properly protected. Consider using the "transient" and/or "protection" tag along with this one, if applicable.

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How to eliminate voltage spike when power supply is switched on with mechanical switches

Let me set the scene first: we have a special racing vehicle, where the power souce is a 12s Lipo battery pack (Nominal Voltage = 48V, Maximum = 52V). The battery is protected by our own Battery ...
István Kecskeméti's user avatar
0 votes
0 answers
31 views

How to replace voltage source with other component to get constant voltage of 3.5v

Anyone knows how to replace the voltage source in the circuit but still get the same waveform?My intention is to get the green waveform, but replacing 3.5V voltage source with other components. I ...
User691's user avatar
  • 13
0 votes
0 answers
61 views

HV output flyback converter voltage spikes reduction

I'm trying to reduce the voltage spikes on the output of a high voltage output (~400 VDC). This output is used to apply a stimulus on a patient to evoke a response, so the output load depends on the ...
SukMyMEMEz's user avatar
0 votes
5 answers
130 views

Is there an equation to calculate the voltage spike caused by an inductor in the absence of a freewheeling diode?

I am using a 50V DC power supply to supply an inductive load of 10mH (any kind of inductive load.) I am using a MOSFET as a low side switch. If I do not use a freewheeling diode to discharge the ...
Sudhanva Gokhale's user avatar
6 votes
1 answer
225 views

How to remove huge startup current spikes in charger circuit? [closed]

I am building solar USB charger model in matlab simulink. It uses solar panel as main power source and body consists of 2 buck converters and a battery. First buck converter has output capacitor(...
Ultrix626's user avatar
0 votes
2 answers
77 views

Do 12V fans for cooling a chassis commonly need external flyback diodes?

I'm building an electronics controller. I have a chassis with a 12VDC cooling fan. It seems to me that a fan might present an inductive load to the ACDC power supply it's connected to, so I'm trying ...
Open_Hamster3337's user avatar
2 votes
6 answers
2k views

Simplest way to isolate MOSFET from MCU

I want to switch a 220 V AC motor which is an inductive load with a relay which is controlled by an MCU. I've taken precautions for arcing with a TVS diode on the contacts side, but I still want to go ...
CaveScientist's user avatar
0 votes
3 answers
105 views

Capacitor can't filter the AC detector spikes

I made a simple design to read the status of an 220 V AC relay. I used a diode and resistor to drop the voltage for the PC817 optocoupler and used a capacitor to filter spikes: This is the test ...
Hamid s k's user avatar
  • 333
1 vote
0 answers
40 views

Idea needed to design spike detection

In our electrical workshop, they gave us to design a spike detection telling that later on we will be given a eeg signal as input to our circuit, so we had basic idea that first need to pass it ...
white shadow's user avatar
0 votes
1 answer
30 views

Cause of Current Spikes at Zero Crossing in LC Circuit Connected to 50Hz Mains

I set up a simple experiment where I connected 8x680nF 450VAC polypropylene film capacitors in parallel across a 250VAC, 50Hz mains supply. The capacitors, nominally at 640nF each, have an equivalent ...
15 Volts's user avatar
  • 657
0 votes
2 answers
90 views

How does a voltage surge/spike affect the wall wart power supply's secondary side?

In the photo, you can observe an old-style adjustable wall wart AC to DC power supply, typically composed of a primary winding, secondary winding, rectifier, and capacitor. If a voltage surge or spike ...
xchcui's user avatar
  • 299
1 vote
2 answers
170 views

Simplest circuit to detect 5 V pulse

I have a mechanical assembly with 24 switches, limit switches, selectors, etc. and this assembly along with a box filled with electronics will go and suffer a very long shock and vibration test. I ...
Mike More's user avatar
0 votes
3 answers
114 views

Spikes appearing on the UART pins of Microcontroller when connecting to supply

I am using STM32G0c8t6 microcontroller to make a BLDC motor controller. I am connecting the Rx and Tx of UART to a VCU and they are sharing the same battery. Apart from these, there is no other ...
Gladson Thomas's user avatar
1 vote
1 answer
52 views

AC air compressor voltage spikes [closed]

I have a "mgf compressors" named MINI BEV that generates voltage spikes up to about 500Vpk (353Vrms) on the 230Vrms AC lines. My question is if this is normal? I understand that its an ...
eidetech's user avatar
3 votes
1 answer
119 views

Need regulated 15 kV output

I was just playing around with this ZVS circuit I made in LTspice. It was made to output 15 kV, but when I saw its actual output it had spikes of 25 kV, then it stabilized after a while. How to ...
user012484's user avatar
1 vote
1 answer
44 views

What paths can the induction spike from a relay controlling a Fan and Aircon unit take? How to problem solve it? What would you do?

Problem: I have an induction spike feeding back into my AirCon and Fan control project when the fan or Aircon is switched off. The program keeps running on the microcontroller but the spike ...
Jonathan Birch's user avatar
0 votes
2 answers
313 views

Two switch forward converter with transient spikes on gate to source voltage

I have a problem with my two switch forward converter. As soon as the current increases at the input from around 200mA, a transient/spike starts appears at both the turn-on and turn-off of Vgs. The ...
PowerSayan's user avatar
0 votes
1 answer
83 views

Should I use an N-channel or a P-channel MOSFET in a coil gun?

With an N-channel MOSFET, the coil is located between Vcc and drain so when the MOSFET switches off the coil has to create a big voltage spike because it has to overcome the MOSFET. Is that problem ...
MineII CrafterII's user avatar
1 vote
2 answers
127 views

How to measure inrush current over 3 minutes

I have a DC electronic system that takes approx. three minutes to boot up, and I have to decide what gauge wire to make power cables. During boot up, this system powers on several different sub-...
mikey B's user avatar
  • 11
1 vote
1 answer
74 views

FPGA controlled ADC has undefined data

I have an MAX11116AUT-T ADC Controlled by an FPGA at a 6.25MHz clock. Once the CS signal is set to low, I can see data being returned by the ADC on the falling edge of the clock. There is, however, a ...
Mart's user avatar
  • 376
2 votes
6 answers
299 views

When starting up an LDO, a spike appears on the output voltage; can it damage the microcontroller?

(This my first post, I hope you can clearly understand my problem) The ME6203-50 IC is a High Input Voltage LDO Regulators from Microne (Nanjing Micro One Electronics Inc). I'm looking to use theses ...
Jack Berg's user avatar
0 votes
1 answer
47 views

How can I generate an intentional DC spike voltage?

I have a 24 VDC circuit which uses a photocell to detect the level of fluid in a tank. When the level drops, this operates a 24 VDC, 1 A fluid solenoid which refills the tank. It works fine with ...
Chris's user avatar
  • 3
0 votes
0 answers
62 views

How to detect voltage peaks above a set threshold?

I have a power source that will generate voltage peaks for a very short amount of time (around 20 - 100 Microseconds long). I am trying to develop an electrical circuit that will capture the peak ...
Raph's user avatar
  • 1
1 vote
1 answer
72 views

20 V peak on a buck converter output

I noticed that an LM5007 buck converter set to 3.3 V on startup shows a peak of 20 V for 150 ns, and then a smaller peak after 100 ns. I know that the feedback resistors have the wrong values. Below ...
Marek Bílý's user avatar
7 votes
3 answers
701 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
5 votes
2 answers
609 views

EMC emission harmonics

I have a crystal associated with an Ethernet-to-PCIe bridge operating at 25 MHz. I observe spikes at 62.5 MHz and 312.5 MHz. Those harmonics are 2.5 times and 12.5 times the crystal fundamental ...
user avatar
1 vote
1 answer
316 views

Spikes on IGBT's turn-on waveforms

Here are the ideal IGBT turn-on waveforms and the actual waveforms from my own gate driver. What causes the spikes on the actual waveforms at t0? Idealized gate turn-on waveforms IGBT Turn-on ...
hossein valizadeh's user avatar
1 vote
2 answers
142 views

Is lightning waveform a special case of RC discharge circuit? Why is it modelled as a double exponential function?

As per wiki: The electric current within a typical negative CG lightning discharge rises very quickly to its peak value in 1–10 microseconds, then decays more slowly over 50–200 microseconds. Why ...
Dynamic_equilibrium's user avatar
0 votes
2 answers
158 views

Basic NE555 assembly exhibits voltage spike

I have below the most basic NE555 assembly and I observe a voltage spike in my signal with the oscilloscope. I am barely jumping back on the electronic wagon after 20 years, so I may miss something ...
galop1n's user avatar
  • 103
0 votes
2 answers
146 views

Designing a flyback converter for 12V Input to 120V Output with LT Spice. Are these reverse voltage spikes normal

With this setup, I'm getting some periodic voltage spikes on the primary and secondary inductor (secondary spikes to around 2.7kV). The output shows the constant ~120V I want. Are those voltage spikes ...
P4r4Lys3d's user avatar
15 votes
6 answers
3k views

Does switching on a bench power supply cause a voltage spike on its outputs?

In an Adafruit guide, it is claimed that bench power supplies may produce a voltage spike upon turn on: Source I cannot find any reference to this. My assumption is that their target audience (...
Anas Malas's user avatar
0 votes
3 answers
151 views

LED blinker draws high current during switching, how to prevent current spikes

I have the circuit below: Now focus your attention on TP4056 charging and protection module because it has a DW01A battery protection circuit in it which detects over current at 3A. Also focus your ...
CaveScientist's user avatar
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
0 votes
0 answers
782 views

How to create a steady 5V battery driven supply for ESP32, with huge intermittent power spikes through other step-up circuit?

Do I really need two batteries? I am having huge trouble keeping the 5 V power supply for the ESP32 microprocessor stable, while the other booster draws maximum power in pulses. The 5 V buck converter ...
wezzix's user avatar
  • 131
0 votes
1 answer
241 views

Replacing a diode with a MOSFET for reverse spike protection

Due to thermal considerations I am trying to replace D2 in this answer with a P-MOS FET. Came up with this diagram: The two D1 symbols are just one bidirectional TVS diode (missing symbol in ...
kellogs's user avatar
  • 1,062
1 vote
2 answers
1k views

ESP32 restarting when relay is turned on

I am designing a PCB with a 5V relay that controls an external DIN mounted latching relay (red line with the "1."): The problem I have, is that the ESP32 often restarts after turning the ...
Carlos Garcia's user avatar
0 votes
3 answers
102 views

Reverse spike protection via MOSFET

M3 has |Vds| > 300V |Vgs| = 10V Protecting the load from V1 = -300V 100ms spike: Does this diagram, with carefully picked components, look like it will do the job ? Hw do I select R1, D2 and D3 ?
kellogs's user avatar
  • 1,062
1 vote
0 answers
130 views

Current Spike when charger plugged in?

Here is the rough set up of the system: Relays used 1-1393277-4 (https://www.farnell.com/datasheets/2243264.pdf ). The way the set up works is when the battery is turned on, there is a micro (not ...
Hasman404's user avatar
  • 747
1 vote
2 answers
519 views

Remove half bridge current spikes

I have the below configuration for driving a half bridge converter: As you can see I use just one signal to turn off and turn on low side and high side MOSFETs. I putin a delay while turning MOSFETs ...
H.hashemi's user avatar
-1 votes
1 answer
207 views

How to get rid of transition spike in LT Spice

I have created the below circuit that simulates the current characteristics for a contactor. However I am getting this huge spike when the switches transitiion. Can someone help to prevent this spike ...
JoeyB's user avatar
  • 2,361
2 votes
1 answer
918 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
1 vote
1 answer
311 views

Reduce or filter DC spike and noise

Goodmorning, I have a small voltage drop (about 20-25 mV, DC) on a sense resistor (0.180 Ohm) and I need to amplify this with an op-amp to reach 2-3 V (DC). The signal is not clean and the noise, with ...
philfs's user avatar
  • 73
2 votes
1 answer
99 views

Unwanted spike in the current sink circuit

I designed (with help of several online/offline resources) the following current sink circuit with features: Should be capable of sinking a maximum of 200 mA (AC, RMS). Follows the input sine wave <...
SKGadi's user avatar
  • 862
1 vote
1 answer
997 views

What causes spikes on a primary push-pull transformer with good snubber and tvs?

I am repairing 8 second-hand microgrid inverters from 2013. The internal structure is a push-pull sinusoidal current generator. DC input 12 to 28V, 250W. The primary side suffers from a design problem....
Ambroise's user avatar
0 votes
4 answers
704 views

FET drain voltage spike in push-pull converter

I have returned to my 150W inverter simulation and have a new problem I can't decipher. This is the design: It runs, it allegedly has good efficiency, and it creates a stable 180V output voltage. I'...
pbandjazz's user avatar
  • 337
-1 votes
1 answer
182 views

Current transformer response to step function DC voltage

I was playing with this current transformer as in the diagram (I've inserted the current transformer as an inductor) and noticed that for a DC step function the voltage is limited (in this example to ...
Tzanker's user avatar
  • 139
0 votes
0 answers
155 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
0 votes
1 answer
251 views

Buck converter (LTC3330) voltage spikes in output voltage and in PGVOUT during transient

I am using Linear Technology LTC3330 (2048A evaluation board) buck converter with VIN thresholds set at 10V and 5V. The output set voltage is 3.3V. Inductor is 22uH. The input capacitor is 200uF and ...
Maddy's user avatar
  • 11
2 votes
2 answers
594 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
0 votes
1 answer
107 views

Why does my output get supercompensated?

I have almost finished a project that was supposed to output a square wave signal with a certain frequency but when I tried to make a small change to the circuit something weird happened to my output. ...
PowerTb321's user avatar