Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [circuit-protection]

A device, components, or safety measure designed to protect circuits from overvoltage, overcurrent, a combination of these; or the theory of same.

711 questions
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What is purpose of components in this circuit

I'm trying to understand this circuit but I can't understand purpose of R4 and R6. Can someone explain their purpose?
user46347
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Should I use two fuses for 220V mains?

I'm designing a product that will be fed directly from 220V mains. The 220V goes into a PCB that has a high voltage section and a AC/DC converter module to generate low voltage to the microelectronics. When using 110V I always use a input fuse for…
RHaguiuda
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Do I need a diode & capacitor in this circuit?

I'm new to electronics as a hobby and have just designed a circuit (so please let me know if there's anything else in this circuit wrong) that uses an H-bridge motor driver to control 2 motors. I've read somewhere that I should use a capacitor and a…
Ewan
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Circuit Protection - Difference between two gas discharged tubes that are spec'd the same?

http://www.digikey.com/product-search/compare/en?returnUrl=%2Fproduct-search%2Fen%3FFV%3D90c000e%26k%3DGDT%2B500V%2B20%2525%2B5KA%2BTHROUGH%2BHOLE%26mnonly%3D0%26newproducts%3D0%26ColumnSort%3D-1000011%26page%3D1%26stock%3D0%26pbfree%3D0%26rohs%3D0%2…
Jeff
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Emergency USV for circuit

I have a small circuit with a µC in it. Sometimes it can happen that the circuit looses the power connection, resulting in instantanious shutdown. I am looking now for a capacitor which provides me powe for a short time so that my µC can shut down…
arc_lupus
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Continuity protection for ring circuits

In a ring circuit, a continuity fault has the potential to overload the ring and melt some wire. Detecting such fault at the outlet requires impedance testing (expensive), while doing so at the panel would be relatively cheap. So why hasn't anyone…
capr
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Shunt trips cross compatibility

If you are using a molded case circuit breaker with the specs listed below, is it possible to interchange shunt trips as long as they have the same specifications? They seem to be vendor specific. Currently, I am using a Gladiator GCBX4-SHT-24VDC…
David Wisniewski
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How to add safety to line voltage connected to D-SUB?

Pins 13, 14, and 15 on the D-SUB connecter will be connected to 120AC line voltage when their respective relays are on. I can imagine a situation where line is shorted to neutral (dirty connector, bent pins, etc) and I'd like to get ahead of that…
Dave Fol
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Over Voltage Protection circuit without being affected from temperature

I need adding an OVP circuit for my converter circuit. At the 100Vdc the Brown-Out pin of my PWM controller IC will be pulled down to the ground. I did this with the circuit shown below. But, at 80°C, the transistor is conducting too early. At 80Vdc…
OzkulA
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change cell protection value for 18650 from DW01?

From what I read, the tp4056 with protected circuit can still damage the cell. According to data sheet, VOCP at 4.3v, VODP at 2.4v. Is there an "easier" way to lower VOCP, 4.1v, AND increase VODP, 3.0v? TP4056 data sheet DW01 8205A Thx edit For your…
CSK
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What is the simplest solution for over voltage protection?

In a small device (direct current). What is the simplest and efficient solution for over voltage protection? Regards
Jose de arimatea
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Can someone explain, in detail, how this circuit function?

This is supposed to provide over voltage protection for a system placed in a car.Can anyone explain the functionality of each component? I know that this is basically 2 switches; but when will the switches be triggered ? Usage of BZT585B33T is…
Febin Sunny
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USB Hubs + Laptop

Let's be given a laptop and a single USB controller. Now if one wants to use multiple devices, one has to plug in an USB-HUB and then plug everything into it, for example Gaming controllers, cameras, memory sticks etc. AS I see it all devices and my…
Imago
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Circuit protection for the ADC input

I need to protect my ADC from overvoltage and over current. With all the filter elements excluded, the basic configuration i want to build is below(The ADC side will be floating) On the datasheet, it states that the absolute maximum rating on the…
Steve
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Robust 24V alternator input circuit

I need a bit of advice on the following proposals for interfacing an industrial mining truck's 24VAC alternator signal to a micro. The frequency is DC to 1khz. The voltage varies between 5 and 24V depending on the charging. Its a very dirty…
Pieter Potgieter
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