Author Topic: Circuit diagram for power supply kit  (Read 185 times)

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Online Dhanushka

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Circuit diagram for power supply kit
« on: Today at 03:54:31 am »
https://www.ebay.com/itm/0-30V-2mA-3A-Adjustable-DC-Regulated-Power-Supply-DIY-Kit-Short-with-Protection/272492114559?hash=item3f71cbb27f:g:EXAAAOSwa~BYWQ85

Can any one give me the circuit diagram for this kit or any other one better than for this according to following specs?

0-30V variable output voltage with variable 0-3A current

Thanks
 

Offline lordvader88

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Re: Circuit diagram for power supply kit
« Reply #1 on: Today at 02:26:35 pm »
It's some type of buck/boost converter since the max Vcc is 24V but the outout goes to 30V .  I don't see any inductors tho, how is that powering 3A if there's no external inductors ?
 
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Offline mariush

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Re: Circuit diagram for power supply kit
« Reply #2 on: Today at 02:54:19 pm »
Pictures in the link are clear enough to draw the schematic yourself.
 
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Online Dhanushka

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Re: Circuit diagram for power supply kit
« Reply #3 on: Today at 03:33:46 pm »
Dear lordvader88,

The peak value of 24 V is greater than 24 V. Therefore, it has high DC level of greater than 24 V after regulation. Also, it needs a at least 3A transformer for sufficient current of 3A. 

 

Offline MosherIV

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Re: Circuit diagram for power supply kit
« Reply #4 on: Today at 04:29:31 pm »
So you are saying that the kit needs a 24V 3A transformer?

Sounds like a linear type. With 24V input V, the psu will struggle to deliver  good clean  V above 22V under load. 24V transfers are called 24V for a reason - they are designed to deliver 24V under load.
Then the regulation of the psu will loose another 2V approximately.

Sounds like the suppliers either do not know what they are doing or they hope that buyers are not going to notice the poor high power performance or assume it is an assembly issue.
 
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Online JackJones

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Re: Circuit diagram for power supply kit
« Reply #5 on: Today at 04:44:00 pm »
http://www.paulvdiyblogs.net/2015/05/tuning-030v-dc-with-03a-psu-diy-kit.html

There's the schematic, along with some improvements made to it.
 
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Online xavier60

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Re: Circuit diagram for power supply kit
« Reply #6 on: Today at 04:44:11 pm »
It will output 30V or close with little loading.
As well as the 24VAC transformer, looks like a heat-sink and fan needs to be added.
Hioki AS100D vom, HP 54645A dso, Fluke 87V dmm, AN8008 dmm, Agilent U8002A psu, New! FY6600 function gen.
 
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Online Zero999

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Re: Circuit diagram for power supply kit
« Reply #7 on: Today at 05:46:01 pm »
That kit contains some design flaws. At best it'll perform very poorly, at worse, it'll blow up. Here's a thread discussing it in detail.
https://www.eevblog.com/forum/beginners/0-30v-0-3a-psu-audiogurus-version/msg2232978/#msg2232978
 
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