What Happens if You Power a DC Device with AC Voltage?

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Discussion Overview

The discussion centers around the effects of powering a DC device with an AC voltage, specifically considering a scenario where a device rated for 5 V DC is supplied with 10 V peak to peak AC voltage. Participants explore the implications for device operation, potential damage, and the role of device specifications.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants propose that the outcome depends on the specific device and its internal protections against reverse bias.
  • One participant suggests that without reverse-bias protection, internal components could be damaged.
  • Another participant questions whether the device would turn on and off in response to the AC voltage, depending on the voltage levels during each cycle.
  • It is noted that devices requiring DC typically need a steady voltage to function correctly, as they may include integrated circuits that cannot operate with fluctuating voltages.
  • One participant strongly advises against powering a DC device with AC, emphasizing the risks involved.

Areas of Agreement / Disagreement

Participants generally agree that the effects depend on the specific device and its design, but there is no consensus on the exact outcomes or the extent of potential damage.

Contextual Notes

Limitations include the lack of specific details about the devices in question, the assumptions regarding internal protections, and the potential variability in device responses to AC voltage.

salman213
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I was just curious what would happen if a device working at for example, 5 V DC voltage, is given 10 V peak to peak AC voltage. Would the device still operate?

maybe it depends on the device but can someone briefly explain ..?

thanks!
 
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My opinion is that it would depend on the device. If it didn't have reverse-bias protection, you could potentially fry some internal components. I also think it could be turning on and off at the same period as the input frequency.
 
would the on and off result from not getting enough voltage to run it. For example when it is above a certain voltage it is on, but when it drops it turns off until 1 period passes?
 
It would depend on device but I am sure that if it is specified that it requires DC then it must have DC.
Most devices contain integrated circuits, processors etc. These require a steady DC supply to work correctly with reference to a steady ground point. You would then be supplying 5 volts for one half cycle and then -5V for the other and obviosly crossing the 0V line at the rated mains frequency in your country. Most circuits will have some sort of protection to protect against reverse polarity but the IC's etc will not work for below a certain voltage and also reverse polarity.
So the answer to your question is don't do it!

http://www.powerups.co.uk
 

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