AC to DC Converter (with Full-wave Rectifier) Circuit Design
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- Опубликовано: 5 сен 2024
- How does a AC to DC Converter work with full wave rectification and what is the value or Formula for the resulting DC voltage at the output of the AC adaptor circuit? These questions are discussed and answered in this AC-DC converter circuit design and analysis video. This circuit is implemented with two operational amplifiers (Op Amps), two diodes and a few passive circuit components including resistors and capacitors. Both Op Amps should be properly biased with supply voltages applied. The output of each op amp is connected through the circuit to Op Amp's inverting or negative input terminal to enforce negative feedback that keeps op amp in linear region of operation. It is intuitively explained why and how the combination of two Op Amp stages implements full-wave rectifier. In the presented analysis and explanation in the video, it is shown which Diode is turned On and which one is turned off during half periods of the applied input sinusoidal AC voltage. Then the resulting injected AC current is followed to show that the AC current is half wave rectified resulting in positive output voltage. The second stage is effectively realizing a low-pass filter (LPF) with very low cutoff 3dB frequency of 0.8/beta where beta is the scaling value of the feedback resistor for second Op Amp. This very low 3dB frequency of the overall LPF transfer function results in the removal of all non-DC harmonics of the full-wave rectified sinusoid. Therefore only DC component with value of (2*beta/Pi) * amplitude of input sinusoid appears at the output of the circuit.
Dear professor thank you for sharing so much information. Best regards from Brazil
You are very welcome. Thank you for encouraging comment. Glad that my channel is useful. For more circuit design examples please see ruclips.net/p/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt
Thanks for watching.
Very nice explanation. I would like to see more stuff about poles and zeroes. Especially for compensation of some opamp circuits to prevent instability.
You're welcome. Thanks for the comment. I suggest watching this video ruclips.net/video/KwUnQXbk7gM/видео.html that includes discussion about Poles and Zeros of Sallen-Key Filter and overall filter performance. You might also like ruclips.net/video/Ga8Lu8sWlAk/видео.html Analog Filter Frequency Response, Poles and Zeros analysis video. I hope these examples are helpful.
How does a AC to DC Converter work with full wave rectification and what is the value or Formula for the resulting DC voltage at the output of the AC adaptor circuit? This circuit is implemented with two Op Amps, two diodes and a few resistors and capacitors. For more circuit design videos please see the analog circuit and signal processing video playlist ruclips.net/p/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt
And Digital Circuits and DSP playlist ruclips.net/p/PLrwXF7N522y6cSKr0FmEPP_zQl011VvLr
Thanks for watching.
Very interesting circuit, and explained in a way that even I could understand (I think). Is the practical application of this circuit (as compared to just using 4 diodes and a some filter caps) basically cases where you might want to vary beta, and where you don't need much current at the output?
Thanks for watching, your comment & good question. Glad that this AC-DC Converter Circuit is helpful. Answering your question, this circuit allows fast conversion (depending on Op-Amp type) and independence of conversion from the output load that is driven by tge output of the second operational amplifier. For more Analog Circuit examples please see ruclips.net/p/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt
I hope this is helpful. 🙋♂️
Very educative.... Am a physicist.... Please can you recommend a textbook that can teach me every basic calculation involved in building rectification circuit?...
Thanks ....
Glad that this video is helpful. I suggest watching the following related circuit examples to see more detailed calculations:
RMS meter Peak detector AC/DC converter ruclips.net/video/4aG5NYX8tGo/видео.html
AC/DC Adapter Circuit with Op Amp and Diode ruclips.net/video/3rXW5bPlgd8/видео.html
I hope these videos are helpful.
@@STEMprof thank you
@@emmasteph4985 You are welcome. Best wishes with your Physics studies and research.
can you make a simulation for this?ive been trying to replicate it but it wont work
@@Random-ez8kv Thanks for your interest in this circuit. I suggest using a very-low-drift low-noise FET-input Op Amp. Also make sure you have a clean DC voltage supply with proper bypass capacitor. And use resistors and caps with 1% or better tolerance.
To see more detailed calculations, I suggest watching:
RMS meter Peak detector AC/DC converter ruclips.net/video/4aG5NYX8tGo/видео.html
AC/DC Adapter Circuit with Op Amp and Diode ruclips.net/video/3rXW5bPlgd8/видео.html
I hope these videos are helpful.
Ohhhh 😮, i dont know calculus hahah
Thanks for watching. Which portion of this video are your referring to with regard to calculus?
@@STEMprof 21:45 🤣
@@rudygomez6996 no worries. At 21:40 I am just computing the average of the full-wave rectified (meaning absolute) sinusoidal signal by integrating over one period. 🙂
@@STEMprof thank you 🙂
You're welcome.