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Power Supply Design #4 diode rectifiers

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This episode we add diode rectifiers to the power supply. I’ll show the correct wiring to the toroidal transformer. This is the 4th episode in this series.
Power Supply Design #8 How Much Power? • Power Supply Design #8...
Power Supply Design #7 Capacitor - How Big? • Power Supply Design #7...
Power Supply Design #6 Capacitor • Power Supply Design #6...
Power Supply Design #5 Full Wave Rectifier • Power Supply Design #5...
Power Supply Design #4 diode rectifiers • Power Supply Design #4...
Power Supply Design #3 the Toroidal Transformer • Power Supply Design #3...
Power Supply Design 2 - the Fuse and thermistor • Power Supply Design 2 ...
Power Supply Design 1 - the Power Cord • Power Supply Design 1 ...

Опубликовано:

5 сен 2024

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Комментарии : 24

@friedmule5403 5 лет назад

Really great video, I do really like when you go trough a datasheet like that and make the values logic and easy to understand. I have two questions I hope that you will explain. 1) the result you show by using that transformer with two secondary winding's going trough the two diodes looks the same to me as if you had used a single secondary winding with a full bridge rectifier. Is there any difference, advantage / disadvantages in on or the other? 2) Does that mean that the diodes you uses will produce 45C just to rectify, before also delivering power to the load?

@KissAnalog 5 лет назад

Thank you - and great questions! My next video is actually on this subject;). The diodes do not draw current unless there is a load - which there usually is at least a small load

@kenhnsy 3 года назад

This is fantastic for cross disciplinary engineers.

@KissAnalog 3 года назад

Thank you! I appreciate you!

@andyj2106 5 лет назад

Nice video - I like how you go through the data sheets and how you're breaking this down into such small building blocks. Could I make a suggestion? You say that these were used as an example for explanation (that aren't suitable) but it would be useful to go through a second data sheet that was suitable for your design parameters so we could see the choices you were making and, essentially, looking for in a diode. I think that would help in future videos - perhaps you could just explain some of your thinking as to what would be suitable below? Anyway, nice one Eddie, I'm looking forward to the next instalment.

@KissAnalog 5 лет назад

Andrew Johnson Thank you! That’s a great suggestion. I’ll post another video very soon.

@zanemcelroy7910 4 года назад

Building bench supply from dual primary 18v toroid. Adding a thermistor to help with the inrush. Was causing major heat up when plugged in. It's 9amp per coil. Using as32 thermistor from a salt chlorine system rebuild

@zanemcelroy7910 4 года назад

Also pulled a massive 40v 35amp full bride rectifier package with huge surface area/threaded bolt down hole for heatsinking. 70w tdp needed for cooling at full load. Oooooweeeee. Its gonna be warm.

@KissAnalog 4 года назад

Hi Zane - thanks for sharing this! A 32mm sounds like a good size, but is the resistance at cold? Let’s say it is 2 Ohms then drops to 0.02 Ohms when it has current running thru it - it should not get too hot unless you are running 10 Amps or more continuous (I^2*R = 10^2*0.02 = 2 Watts would be toasty).

@KissAnalog 4 года назад

Sounds like just the right size of bridge. Nice job!

@zanemcelroy7910 4 года назад

@@KissAnalog thanks so much for the reply. I sent you some direct messages on messenger with some picture. I'm not 100% on what your question was. At the moment I have nothing hooked up at all. It's an open circuit. Im just trying to double check all my connections before hooking up to the mains for longer than a few seconds w meters connected everywhere. :-)

@zanemcelroy7910 4 года назад

On my last little plug In test my toroid transformer very quickly got warm and I didn't see the correct output voltage on the two output coils in parallel. I'd be happy to show you the label of transformer and how I am trying to understand the wiring.

@stevebailey1682 3 года назад

Hey Eddie...I have a question. Since you did not parallelize the secondary windings, you were able to use 2 diodes instead of 4 (like in a bridge rectifier). What are the pros (and cons) of wiring the secondary like you showed?

@adaml52 5 лет назад

Hi Eddie, good video In practise wouldn't you use a full wave bridge rectifier module than single diodes and use the transformer secondary windings centre tap as the Gnd . So you have split rail (bipolar) power supply, to power most audio amplifiers V+, Gnd , V- and couple filter capacitors ?. Maybe jumping the gun 😀 Adam.

@KissAnalog 5 лет назад

Adam L Thank you, and great timing! I’m working on a video that I’ll post this week that will do just that;)

@htpcandroid4903 2 года назад

Hi Eddie, thanks for the detailed explanation. great video! I have a question though. Why choosing the diodes to be suitable for a voltage of 110V (or 220V in other regions) when those diodes are located on the secondary side of the transformer where the RMS voltage is around 25V?

@KissAnalog 2 года назад

Thank you! Great question! I was working on a different project and my mind was stuck on that one;) You are right, select the diode to 2 or 3x the working voltage to protect against transients;)

@mahlonkarpaiya252 2 года назад

I have a question. I have a 3 wire power suply from a amp. 20v 0v 20v. What i want to ask is can i use this as if it was 2 power suplys by puttion a rectifier diode set up on each 20v wire and use ther negitive wire on both recitifiers.