EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: Raj on November 12, 2019, 04:25:20 pm
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I'm there commentator, 'Suraj Grewal' in this video.
Prove the statement in the screenshot is working for schematic in that point of video.
Video link-https://youtu.be/Rmq4OKhKX-4
My statement... There will never be current flow across diode d3,d4
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Extra protection for capacitor?
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redrawn for clearity
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This circuit is a bit of a mule, a hybrid of dual rail centre tapped half wave and single rail full bridge. Is it a single rail full bridge with a bodge to get a dual rail supply?
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Just a damn classic voltage doubler with two useless diodes.
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Just a damn classic voltage doubler with two useless diodes.
Maybe he did that on purpose, so that it becomes more memorable.
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Sometimes this circuit is used for products that work with both 120VAC and 240VAC.
Drawn like this it would double the output voltage, but when you break the link between TP+ and AC- it would act as a full bridge rectifier for 240V (or 230V really) countries. Although for use with 230V there should be resistors across both the caps to balance out the leakage current.
That might be where the mistake comes from, it's not an uncommon thing to see in various products as I understand it.
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Sometimes this circuit is used for products that work with both 120VAC and 240VAC.
Drawn like this it would double the output voltage, but when you break the link between TP+ and AC- it would act as a full bridge rectifier for 240V (or 230V really) countries. Although for use with 230V there should be resistors across both the caps to balance out the leakage current.
That might be where the mistake comes from, it's not an uncommon thing to see in various products as I understand it.
Bingo....ive seen that in many smps power supply input side...would have made more sense if he was to put a switch there.
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This circuit (with a switch as mentioned above) was used for many years in the "silver box" PC supplies.
The switch would modify the circuit as a voltage doubler (for 120VAC) or a full bridge (for 240 VAC).
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I'm there commentator, 'Suraj Grewal' in this video.
Prove the statement in the screenshot is working for schematic in that point of video.
Video link-https://youtu.be/Rmq4OKhKX-4
My statement... There will never be current flow across diode d3,d4
Please use descriptive titles in your threads.
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I'm there commentator, 'Suraj Grewal' in this video.
Prove the statement in the screenshot is working for schematic in that point of video.
Video link-https://youtu.be/Rmq4OKhKX-4
My statement... There will never be current flow across diode d3,d4
Please use descriptive titles in your threads.
Apparently I can still modify it... Suggest one.
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Voltage doubler, redundant diodes?