[neonixie-l] Re: Q: Active full-wave rectifiers

[martin martin]

Sir Nixie Bunny
I have one of your 10 year old Burroughs Nixie clocks.  Is there any chance 
you would upgrade the FW to include the "slot machine" affect?  I only 
replaced one tube in about 9 years

I'll pay of course!


martin

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[neonixie-l] Not a Nixie but since the E1T was mentioned recently I thought the S11S1 must be mentioned here!

[Dekatron42]

The S11S1 is an experimental tube that combines an E1T with output 
electrodes for all ten stages!

Just have a look here and marvel at the mechanical construction: 
http://www.hts-homepage.de/DDD/S11S1.html

I'd love to have a few of those to build a clock with!

/Martin

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[neonixie-l] Re: Q: Active full-wave rectifiers

[Paul Andrews]

@gregebert: Yes, I ordered a switching regulator. The 6.3V AC just happens 
to be available on the transformer I am using for other purposes.

@jfeng: I am tending to agree that an isolated 5V power adapter is the way 
to go, particularly as I will want the logic circuits to stay functioning 
even if I disconnect the mains transformer. However, as an exercise, this 
is turning out to be more interesting than I thought, so I will pursue it 
for a while longer. Not sure if I'm up for building my own buck/boost 
converter. Yet.

On Sunday, March 24, 2019 at 10:46:22 AM UTC-4, Paul Andrews wrote:
>
> I want to create a 5V/1A regulated power supply from a 6.3V RMS input. I 
> can get a regular diode bridge in a 4 pin DIP package, but it is marginal 
> and my simulations and actual tests show that the forward voltage drop is 
> too much under even a light load. My simulations show that a Schottky diode 
> bridge works OK, and I can get an SMD 4 pin package with a total forward 
> voltage drop of around 0.8V. However, I have seen designs for active MOSFET 
> full-wave rectifiers, so I figured I might as well try to go that route.
>
> I came across two potential ICs to help. One is the LT4320 and the other 
> is the FDMQ8205. The LT4320 uses external FETs, but the killer seems to be 
> that the minimum output voltage is 9V. The FDMQ8205 has internal FETs, but 
> I can't figure out how I would use it in a regular full-wave bridge 
> rectifier. It has AC inputs and gate drive inputs and I'm not sure what the 
> gate drive inputs should be. In note 4 in the datasheet 
> they show a wiring 
> diagram that connects the AC input to the gate inputs, but I can't tell if 
> that is a topology that would provide full wave rectification, or if it is 
> just something used for testing.
>
> Does anyone have any experience with active bridges at these voltages, or 
> with these ICs? Is there an alternative I should be looking at? Should I 
> just stick with the Schottky diode version?
>

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Re: [neonixie-l] Re: Q: Active full-wave rectifiers

['jf...@my-deja.com' via neonixie-l]

If all you want is to get 5Vdc rom the mains, a USB charger seems like a 
very attractive option.  They are usually less than US$5 and occupy about 
1cu in (plus the power plug).  My initial concern would be safety 
isolation, but some of these will surely be UL listed or CE qualified.

However, if you are doing an engineering laboratory exercise requiring 
using a 6.3vac source then this is almost interesting.  It should be 
possible to build a buck-boost regulator that will tolerate a very wide 
range of unregulated inputs.

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Re: [neonixie-l] Re: Q: Active full-wave rectifiers

[gregebert]

I tend to use higher voltage transformers, in the 8-12VAC range, full-wave 
rectifiers + filter-cap, then use switching-regulators that are 
pin-compatible replacements for the popular LDO regulators. They are 90%+ 
efficient, and therefore generate almost no measurable heat. 

If the current is really low, say 50mA or less, I'll use an LDO.

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RE: [neonixie-l] Re: Q: Active full-wave rectifiers

[johnk]

And I’d ask about mains stability.

Was half-wave ruled out?

 

John K

 

 

From: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com] On 
Behalf Of petehand
Sent: Monday, 25 March 2019 18:43
To: neonixie-l
Subject: [neonixie-l] Re: Q: Active full-wave rectifiers

 

I would use four discrete schottky diodes in a bridge, and a low dropout 
regulator like an LM1117. The 5V version of the LM1117 regulates down to 6.2V 
input and delivers 800mA.

 

 

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[neonixie-l] Re: Q: Active full-wave rectifiers

[petehand]

I would use four discrete schottky diodes in a bridge, and a low dropout 
regulator like an LM1117. The 5V version of the LM1117 regulates down to 
6.2V input and delivers 800mA.


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