Author Topic: Bridge Rectifier Dissipation  (Read 307 times)

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Offline boatanchorguy

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Bridge Rectifier Dissipation
« on: January 16, 2018, 03:40:53 am »
With a basic 4 diode bridge rectifier where there is no load - just open circuit on the output side - am I correct that the only energy expended in this system would be heat due to the voltage drops across the diodes? 
 

Offline rx8pilot

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Re: Bridge Rectifier Dissipation
« Reply #1 on: January 16, 2018, 03:44:15 am »
An open circuit has no current. Without current, there is no heat.

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Offline TimNJ

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Re: Bridge Rectifier Dissipation
« Reply #2 on: January 16, 2018, 04:18:29 am »
Not sure the context of your question but yes, without any current, there cannot be dissipation.

On a side note, if you try to probe a bridge rectifier open circuit (or effectively open circuit with a 10M scope probe), you may see some weird nonlinear waveforms. Apply a little load to it and you’ll see what you’d expect.
 

Offline madires

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Re: Bridge Rectifier Dissipation
« Reply #3 on: January 16, 2018, 04:37:50 am »
There would be a negligible small power loss because the diodes have a tiny leakage current.
 


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