Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [protection]

Ancillary circuitry that protects the main circuitry in case of a fault. Examples of faults protected against are: overvoltage, ESD, overheating, and overloading (too high of a current draw). In some cases the protection circuitry is sacrificial, being destroyed or degraded in the act of protecting.

Recommended reading:
How to protect low-speed interfaces and power supply circuits by Littelfuse (2021)

918 questions
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Protecting electronics against welding damage

Users who perform welding on machinery are not necessary diligent in taking precautions like disconnecting the battery from the vehicle. Apparently, welding can cause severe damage to the electronics. So: What is the actual mechanism that causes…
Damien
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Circuit Protection

I want something for my power that acts like a diode, but without the voltage drop, to protect the circuit from damage if the batteries are connected the wrong way. Is this even possible?
Dean
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Are PTC resettable fuses fast enough to protect from shorts?

Time to trip of most of PTCs is about 0.1 seconds. In case of short between VCC and GND the current will be very high (maximum a power supply can provide) for at least 0.1s. Isn't it enough to burn out one of the components usually present in series…
ibiza
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ADC over-voltage input protection while keeping accuracy?

i just want to get the idea for the input voltage protection for a fully differential ADC. The analogue voltage inputs supposed to be 0-5v, but someone being careless could plug a higher voltage (up to probably around 20v) by accident and blow the…
napon
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How do I protect power out connector from having power in connected to it?

I'm building an adapter for rotary encoder that reads input of encoder and sends pulses by RS485. I'm using two RJ-45 connectors to provide power both for adapter and encoder. Both connectors have the same pinout. The right side connector receives…
miceuz
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How are engineers protected against lightning strikes when testing transmission lines?

Transmission lines have protection systems to protect themselves from lightning strikes, but in the case of a strike hitting a line under test - how is the user protected? I'm looking for an answer in the scenarios of a strike hitting the line 20…
user160063
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circuit protection feedback

The is the simulated version of the schematic. I have designed a protection circuit for my pcb and I would appreciate having some feedback before starting the PCB design. The circuit is broken down as follow; -ESD protection provided by a one…
user49395
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Sense coil based leakage current meter (with LCD display)

This is the circuit diagram of the previous Leviton GFCI receptable without auto-monitoring self test. Do you (or others) know whether the current coming out of the sense transformer or sense coil is directly the differential current of say 3mA? Or…
Jtl
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Overcurrent shutdown circuit

This circuit mainly consists of a high side current sensing circuit, a current mirror, an op amp, U1, working as a comparator, and a controlling PMOS, M3, to control the current through the load. Here's the schematic: When the load current exceeds…
dirac16
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Protection diode selection for wire wounded resistor load

I need to know how to select the free wheeling protection diode for the circuit? the load is wire wounded resistor of 115 ohm with 3.5 Kilo watt. Can any one suggest me is protection diode required in this case? and if yes please let me know how to…
Ajit Kumar
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Overcurrent Protection Circuit

I'm pretty new to electronics and the first thing I want to have on a PCB is a simple signal source (sinusoidal 12V RMS ; 100 Hz Frequency). To not blow things up I want a current monitoring circuit which should disconnect the source if the load…
Marco
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Significance of gl/gG rating on circuit breaker

I noticed that circuit breakers have a gl/gG rating. eg: gl/gG= 100A. Can someone explain the significance of this rating?
SivaDotRender
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Protecting voltage source from reversed voltage

I have this circuit for having measurements like with a multimeter diode function. The ADS1115 result is reported to PC software and stored in a database for later reference comparison. I could protect the ADC INPUT by Zener diode and op-amp…
Husam
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Hysteresis for battery protection circuit?

recently I asked the forum for help to build a 12v li-ion battery undervoltage protection circuit and some kind members solved the issue (click to preview). however, (user @Prathik Prashanth) mentioned a very clever point that you don't usually take…
jzeds1491
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What does zero Iq means in reverse voltage protection ICs

I was looking for reverse voltage protection circuits for my circuit. I happen to stumble upon an IC LM74610 combined with a NMOS seems to offer a good Reverse voltage protection. As i am skimming through the datasheet to see if it can work within…
Jake quin
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