I built the following full wave rectifier circuit. The negative waves should be flipped to positive waves but they are completely cut off. Why are the negative waves cutoff and are not flipped ?
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1\$\begingroup\$ Where are your voltage probes in the circuit? \$\endgroup\$InBedded16– InBedded162024-10-15 13:10:29 +00:00Commented Oct 15, 2024 at 13:10
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2 Answers
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You are plotting v(OUT) relative to ground and not to the lower end of R1: -
I've put a red circle around the node where you are incorrectly plotting v(OUT) relative to (should you expect to see the voltage across R1). That node has a GND symbol attached and, that means that a plot of v(OUT) does exactly that; it plots v(OUT) relative to GND.
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\$\begingroup\$ Thank you. It works now. Also added a capacitor parallel to R1 and LTspice showed me an error with Matrix ... but then i grounded also the negative terminal of R1 and then it worked. \$\endgroup\$Tim Graf– Tim Graf2024-10-16 17:19:31 +00:00Commented Oct 16, 2024 at 17:19
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\$\begingroup\$ @TimGraf you can't ground both the input to the bridge rectifier and the output because you short out a diode. if we are done here, please take note of this: What should I do when someone answers my question. If you are still confused about something then leave a comment to request further clarification. \$\endgroup\$Andy aka– Andy aka2024-10-16 18:06:05 +00:00Commented Oct 16, 2024 at 18:06
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Your diodes are connected incorrectly. The cathodes of D1 and D3 should be connected together, and the anodes should be connected to the positive terminal of the input voltage. Similarly, the cathodes of D2 and D4 should be connected together, and the anodes should be connected to the negative terminal of the input voltage.
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2\$\begingroup\$ Your answer appears to have accumulated a couple of down-votes. Would you care to show us what you're suggesting by making use of the site's built-in schematic editor in case there's some confusion? \$\endgroup\$brhans– brhans2024-10-15 13:26:46 +00:00Commented Oct 15, 2024 at 13:26
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1\$\begingroup\$ The rectifier is drawn correctly. Your suggestion doesn't seem to make sense: if you have two diodes D1 and D3, with cathodes shorted, then you also connect anodes to the same "terminal" of the input voltage, you just got two diodes in parallel. Besides, there is no positive nor negative terminal of the input voltage. That's the whole point of a rectifier. \$\endgroup\$Kuba hasn't forgotten Monica– Kuba hasn't forgotten Monica2024-10-15 16:10:17 +00:00Commented Oct 15, 2024 at 16:10