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Author Topic: Adjustable DC Regulated Power Supply (0 - 30 V 2 mA - 3 A)With Digital Control  (Read 3628 times)
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sadman
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« on: March 11, 2019, 05:17:03 05:17 »

Hi

Although it is very famous design from electronics lab but recently Elektor launch it as kit, original design have some bug in it which was optimized by Audioguru at eevblog in this attachment i have added the schematic optimized by Audioguru and Elektor kit PDF document bonus added digital control of this power supply by a Russian forum and 10A version by the same forum. i like the digital control part of this power supply.

Regards
sadman

 
« Last Edit: March 11, 2019, 05:19:31 05:19 by sadman » Logged
sadman
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« Reply #1 on: March 11, 2019, 11:52:43 11:52 »

Elektor is selling same kit from banggood which is also have same bug as banggood and electronics lab circuit Audioguru modified the circuit which is much better and work as expected he did a great job complete discussion is here.

https://www.eevblog.com/forum/beginners/bangood-psu-enhancements/
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Wizpic
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« Reply #2 on: March 11, 2019, 06:34:33 18:34 »

I built this PSU some years ago, Based on the same design as the links you posted. I did have some problems with it, If you read pages and pages over on the electronics lab forum, One topic is 94 pages long.

In my opinion the design is not very good or reliable, I found that it worked but after some testing I found that the current limit side did not work if I remember correctly, I was not really happy with it so I stopped using it and threw it in the bin in the end even tough I paid little extra for the TLE2141 op-amps and carried out all the mod's but still no joy.

Sorry don't mean to be negative, Good share for people who want to build it on a budget and some people may disagree with me. From reading through most of the comments there is lots of people having issues  and Audioguru has answered everyone or someone tries to change the design.


Makes you wonder if the Elektor are selling that supply with the TLE2141 op-amps with that kit as it only cost 11 euro's ?

Those op-amps cost me round about £6 GBP for the 3.
The digital readout looks ok, But I would rather build my own using a 16bit ADC with a TFT display or a GLD with bigger fonts .
One of the best power supplies I've built was based on the veleman K7200 which they discontinued  Sad

Well that's my 2 pennies worth  
« Last Edit: March 11, 2019, 06:37:33 18:37 by Wizpic » Logged

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sadman
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« Reply #3 on: March 11, 2019, 10:22:43 22:22 »

I built this PSU some years ago, Based on the same design as the links you posted. I did have some problems with it, If you read pages and pages over on the electronics lab forum, One topic is 94 pages long.

In my opinion the design is not very good or reliable, I found that it worked but after some testing I found that the current limit side did not work if I remember correctly, I was not really happy with it so I stopped using it and threw it in the bin in the end even tough I paid little extra for the TLE2141 op-amps and carried out all the mod's but still no joy.

Sorry don't mean to be negative, Good share for people who want to build it on a budget and some people may disagree with me. From reading through most of the comments there is lots of people having issues  and Audioguru has answered everyone or someone tries to change the design.


Makes you wonder if the Elektor are selling that supply with the TLE2141 op-amps with that kit as it only cost 11 euro's ?

Those op-amps cost me round about £6 GBP for the 3.
The digital readout looks ok, But I would rather build my own using a 16bit ADC with a TFT display or a GLD with bigger fonts .
One of the best power supplies I've built was based on the veleman K7200 which they discontinued  Sad

Well that's my 2 pennies worth  

Hi Wizpic

I will never take your comment as negative as comments always open up new possibilities and ideas I have the whole design and build instruction of K7200 power supply based on LM723 using two pair one for current control and one for voltage.

I build that for 2 Amp current only as for hobby level you never need current over 2 amp personally I like mix mode power supply switching regulator for pre regulation and linear regulator for output Which will allow good control of heat dissipation (made that supply using LM2596 and LM338) with CC , CV function if member interested I will share K7200 build info here.

sadman
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Sideshow Bob
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« Reply #4 on: March 12, 2019, 09:56:00 09:56 »

Hi Wizpic

I will never take your comment as negative as comments always open up new possibilities and ideas I have the whole design and build instruction of K7200 power supply based on LM723 using two pair one for current control and one for voltage.
I think most of the newer K2700 projects are based on info from this book(link included not my own but checked out) But by all means start a new thread for a K2700 project
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Wizpic
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« Reply #5 on: March 12, 2019, 10:59:45 10:59 »

I think most of the newer K2700 projects are based on info from this book(link included not my own but checked out) But by all means start a new thread for a K2700 project
There is someone selling the bare PCB on e-bay and funny enough itís my drawings and the one on 320v.com, years ago I copied and laid out the pcb for it,the one on 320volt.com is my case drawing too I know itís mine because itís got smart designs on pcb lol, itís a good power supply
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« Reply #6 on: March 12, 2019, 03:32:16 15:32 »

Hi sadman

there is a relay control block diagram to select the secondary winding of the transformer,
do you have the sch for this block?

Regards
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« Reply #7 on: March 14, 2019, 06:11:22 18:11 »

Not to be the bearer of bad news, but the russian "addition" does not do any Digital Control.

The so called "Digital Control" only reads the voltage and the current, displays it on a 16x2 LCD and probably (I cannot tell only by looking at the russian schematic) cuts the output if overload occurs.

There are options to do digitally controlled power supplies by implementing a DC/DC (like my PSU based on TL494 and 12 bit DACs), but also linear options may be implemented with digipots (careful on the max current that can pass through the digipot).
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« Reply #8 on: May 16, 2019, 01:08:52 13:08 »

I think it is not worth trying to do any digital control, because PID control is needed. But even so, the loop through the MCU takes time to regulate the output.

There are cheap alternatives in Banggood now that work very well, with lots of current and wide range of voltage output.

See here: https://www.banggood.com/RUIDENG-DPS5020-Constant-Voltage-Current-Step-Down-Communication-Digital-Power-Supply-Module-p-1181200.html?rmmds=detail-left-hotproducts__6&ID=514816&cur_warehouse=CN

pic_maniac
« Last Edit: May 16, 2019, 01:14:31 13:14 by pic_maniac » Logged
Old_but_Alive
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« Reply #9 on: May 17, 2019, 01:44:40 01:44 »

I have 3 of these, and I recommend them.


https://www.banggood.com/DP50V5A-Buck-Adjustable-DC-Power-Supply-Module-With-Integrated-Voltmeter-Ammeter-Color-Display-p-1050061.html?currency=USD&utm_source=rtbhouse&utm_medium=cpc_brand&utm_content=all&utm_campaign=rtb-electronics-all-en&cur_warehouse=CN


there are several versions, lower cost for the 30V, 3A version.

Bluetooth and serial interfaces work.

One of the DP50V5, I use a boost converter to up 12V to 50V.

https://www.banggood.com/DC-DC-8_5-48V-To-10-50V-10A-250W-Continuous-Adjustable-High-Power-Boost-Power-Module-Step-Up-Board-p-1248941.html?rmmds=search&cur_warehouse=CN

It works fine
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« Reply #10 on: May 17, 2019, 06:00:04 06:00 »

I've just ordered one of those after reading lots of opinions on them, a DPS5005. Should arrive next week. Now I'm deciding whether to power it from a linear PSU built around a 160W torroid I have lying around, or buy a 48V SMPS. I'm trying not to spend more than absolutely necessary though so I'll probably go for the linear since I have all the parts needed.

That boost converter is a good idea though... I have plenty of high current 12V PSUs... another option!
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sadman
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« Reply #11 on: September 01, 2019, 04:30:29 04:30 »

an update to the schematic
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bobcat1
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« Reply #12 on: September 01, 2019, 09:15:22 09:15 »

I don't think I will build something like this:
As the design is old ,full linear ,inefficient ,need tow power source ....
Today bench-top power supply designed as switching + tracking(LDO follow the switcher) in order to get low noise and high efficiency with computer control (digital control) and LCD (TFT) screen who can measure the resistance of the lead wire(cable) in order to compensate the loss, with far less weight in compare to linear unit due to the lake of heavy linear transformer

But whether you are looking for simple design Wurth Electronic has an evaluation board with schematic name : DNS002 MagI3C Power Supply
who can provide 0~15V and 0~2.5A from any switching 7~36V PSU the design is simple and can work with almost any switching regulator who provide [email protected] (test it with simulation) and no need for a heavy linear transformer.

https://www.we-online.com/web/en/electronic_components/news_pbs/News_Detail_Standard_Parts_111618.php


 

All the best

Bobi
     
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pic_maniac
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« Reply #13 on: September 01, 2019, 02:42:29 14:42 »

Things have changed and building a linear PS is too much power wasted as heat. Though, I have not found a good design with tracking LDO.

There are plenty PCBs ready made SMPS with a lot of ampere capacity and digital control in the usual Chinese sites if one wants an almost ready made solution.
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zac
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« Reply #14 on: September 01, 2019, 05:04:56 17:04 »

Things have changed and building a linear PS is too much power wasted as heat. Though, I have not found a good design with tracking LDO.

There are plenty PCBs ready made SMPS with a lot of ampere capacity and digital control in the usual Chinese sites if one wants an almost ready made solution.

Keep in mind switching power supplies tend to be noisy (electrically) so may not be ideal for some applications such as those dealing with very small voltages.
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« Reply #15 on: September 02, 2019, 02:36:32 02:36 »

That is why (in good designs) they are followed by a tracking LDO.
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sadman
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« Reply #16 on: September 02, 2019, 01:01:14 13:01 »

That is why (in good designs) they are followed by a tracking LDO.

I will share a good design with tracking LDO
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zac
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« Reply #17 on: September 02, 2019, 08:48:24 20:48 »

Are there any lab power supplies that have a switching topology with an LDO or other method of reducing noise on the output?  

I've been using these old HP linear variable power supplies that are rated at 0.35 mV (rms) ripple/noise.  I wish I could finish a switching version with noise characteristics that are within an order of magnitude of that.  

https://www.keysight.com/us/en/products/dc-power-supplies/bench-power-supplies/e3630-series-bench-power-supply-80-200w.html

Some switching models such as this one claim 0.5 mV (rms) noise/ripple, but that seems hard to believe:

https://www.amazon.com/Variable-Precision-Adjustable-Regulated-Alligator/dp/B077GVMP5X
« Last Edit: September 02, 2019, 08:57:32 20:57 by zac » Logged
sadman
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« Reply #18 on: September 05, 2019, 07:49:34 07:49 »

That is why (in good designs) they are followed by a tracking LDO.

here is design with LDO and tracking
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bobcat1
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« Reply #19 on: September 08, 2019, 09:43:44 09:43 »

here is design with LDO and tracking

One limit this power supply output limited to less then 20V

All the best

Bobi
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sadman
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« Reply #20 on: September 08, 2019, 11:40:52 11:40 »

One limit this power supply output limited to less then 20V

All the best

Bobi

share design is for reference it can be easily modified up-to 30 volts in those days i am working on good LAB power supply with CC/CV mode and microcontroller controlled

sadman
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pic_maniac
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« Reply #21 on: September 09, 2019, 04:34:47 04:34 »

The point of sadman was to show how to use tracking regulator. The rest is up to the experienced designer.
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