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GOPHERT CPS-3205 adjustable switch mode power supply - description and review

grala1 8259 16
This content has been translated » The original version can be found here
  • Hello again, everyone.
    Today I will try to describe you the Chinese regulated impulse power supply by GOPHERT, model CPS - 3205. Perhaps this description will encourage you to buy this power supply, discourage you or help you make a decision.
    I bought my copy on Aliexpress for $ 44.98 with the shipment (Aliexpress additionally gave me a $ 3 discount coupon, which allowed me to lower the price from the one given above - so there is always a few zlotys more in my pocket). After about 16 days, it was already in my possession - quite quickly considering the dimensions of the package.
    From what I noticed, such a power supply in Poland is offered by only one company from Wroc³aw for PLN 300 with shipping.
    Below are some details of this switching power supply:
    - 115VAC or 230VAC input voltage set with a switch next to the power socket;
    - regulation of the output voltage in the range from 0 to 32VAC;
    - resolution of the output voltage adjustment 0.01V;
    - regulation of the output current in the range from 0 to 5A;
    - current regulation resolution 0.001A;
    - maximum output power 160W;
    - visualization of settings and reading of parameters on two four-digit seven-segment LED displays;
    - adjustment of settings via an encoder;
    - power supply dimensions, approx. 120x60x195mm;
    - weight, approx. 700 g.
    The power supply is in a metal, aluminum housing, it is sold with a power cord, and a two-color two-wire cable with banana-crocodile tips and a short instruction manual in English.
    The described power supply is managed by the STM8S105K4T6C microprocessor.
    Below is a photo of the front and rear panels.

    GOPHERT CPS-3205 adjustable switch mode power supply - description and review

    GOPHERT CPS-3205 adjustable switch mode power supply - description and review

    Below are some photos of what we can find inside our device and what is hidden under the front panel.

    GOPHERT CPS-3205 adjustable switch mode power supply - description and review
    GOPHERT CPS-3205 adjustable switch mode power supply - description and review
    GOPHERT CPS-3205 adjustable switch mode power supply - description and review
    GOPHERT CPS-3205 adjustable switch mode power supply - description and review
    GOPHERT CPS-3205 adjustable switch mode power supply - description and review
    GOPHERT CPS-3205 adjustable switch mode power supply - description and review

    It's time to describe how we make settings in this small power supply.
    The power supply is turned on with the rocker switch located at the back of the housing. After switching it on, the left display shows the current measurement of the output voltage - 00.00V, and the right display shows the word "OFF", because to fully start the power supply, use the "ON / OFF" switch on the front panel. After pressing the "ON / OFF" button, the current voltage will be displayed on the left display and the current output will be displayed on the right display. The PSU remembers the settings used during the previous use of the PSU despite disconnecting it from the mains.
    There are two LEDs next to the right display - the green one described as "CV" - voltage limitation, and the red one described as "CC" - current limitation. Usually, the green CV LED is on all the time, because we have an active limitation of the output voltage by entering the output voltage setting value. The red one will add "CC" and it will light up only when the current drawn from the power supply is greater than its setting - at this point the "CV" LED turns off.
    On the righton the side of these two LEDs we have a "V / A" switch, thanks to which we choose what we want to set - voltage or current. Further on the right there is an encoder with which we can change the settings.
    To set the voltage, select the "V" switch and press the encoder. The unity value after the decimal point is highlighted; by turning the encoder, we change it, another press of the encoder will move the highlighted value to the left - this time to the value of tens after the decimal point, another press of the encoder will again shift the highlighted value to the left and now we can change the voltage unity order on the output, another press of the encoder will cause the highlighting decimal values. After approx. 3 seconds of inactivity, the display changes to the current voltage value at the output.
    Here are a few photos to make it clearer.

    GOPHERT CPS-3205 adjustable switch mode power supply - description and review
    GOPHERT CPS-3205 adjustable switch mode power supply - description and review

    Next pressing of the encoder or turning it will display or change the value of the last set.
    Change the current setting in the same way as the voltage setting, but you need to set the switch to the "A" position.
    Another photo.

    GOPHERT CPS-3205 adjustable switch mode power supply - description and review

    There is also a "LOCK" button on the front panel, it is used to lock the settings. After pressing it, a red LED lights up under this button and from now on, we cannot change the current and voltage settings, even though after turning the encoder the right digit on the current or voltage display lights up, depending on the current or voltage display. which position is the "V / A" switch. Unlocking the settings is done by pressing the "LOCK" button again.
    Here is a photo after pressing "LOCK".

    GOPHERT CPS-3205 adjustable switch mode power supply - description and review

    Below are some photos from voltage measurements.

    GOPHERT CPS-3205 adjustable switch mode power supply - description and review
    GOPHERT CPS-3205 adjustable switch mode power supply - description and review
    GOPHERT CPS-3205 adjustable switch mode power supply - description and review
    GOPHERT CPS-3205 adjustable switch mode power supply - description and review

    Below are some photos from current measurements.

    GOPHERT CPS-3205 adjustable switch mode power supply - description and review
    GOPHERT CPS-3205 adjustable switch mode power supply - description and review
    GOPHERT CPS-3205 adjustable switch mode power supply - description and review

    As you can see - the voltage and current measurements on the PSU's displays are quite precise.
    We can also notice that sometimes despite the current limit setting, the output current is a bit higher than in the setting. I don't think it will do any damage, because as you can see - the maximum difference is 5mA.
    For the test, I decided to load the power supply to the maximum for a few minutes and see if it would survive or die.
    Here are some photos.

    GOPHERT CPS-3205 adjustable switch mode power supply - description and review
    GOPHERT CPS-3205 adjustable switch mode power supply - description and review

    As you can see in the picture above - after more than 7 minutes of maximum load, the maximum temperature of the power supply in the warmest place is 32 ° C, so you can say that nothing at an ambient temperature of around 22 ° C.
    The cables got the most in this test. After a few minutes, they became more flexible than silicone tubing, although these are ordinary. This is not surprising as the cross-section of this cable is probably 0.5mm.
    Here is a picture of the wires.

    GOPHERT CPS-3205 adjustable switch mode power supply - description and review
    GOPHERT CPS-3205 adjustable switch mode power supply - description and review

    As you can see in the photo below - the "little Chinese hands" did not touch when making these wires, it was a pity for them even to solder the wire to the terminal. I recommend replacing these cables with other ones with banana plugs, because these are also not of the best quality, and sometimes such cables fell apart after a few days of use.
    Summarizing the power supply, I can say that the operation of the power supply is very intuitive and can be assimilated in a few minutes without reading the manual, so it will not bring a problem to anyone.
    For me, this power supply is very handy, easy to use, has small dimensions and is light, which makes it portable. A big advantage for me is showing the value of the current limit setting, which I missed in other power supplies.
    In turn, its disadvantages for me are the location of both the output sockets on the back of the casing and the rocker switch, and the inability to replace the fuse without disassembling the casing. Although I think that if the sockets and the rocker switch were at the front, it would increase the dimensions of the power supply.
    The power supply makes sounds, the volume of which depends on the load on it, but it is not bothersome or terribly loud, I would risk saying that the power supply in which the fan starts is louder.
    In the manual, we can find information that this device has an efficiency of approx. 88%, that it has protection against overheating and short-circuit. I did not check the efficiency - I did not care about it, I also did not have the opportunity to check the thermal protection and the short-circuit protection is probably the fuse inside the device, which can be seen in one of the photos.
    I had no way of checking "how I sow" this power supply.
    I had no problems with powering the electronics from it, and with charging the car battery overnight - the electronics did not fail, the power supply did not cause any problems.

    I think that the power supply in this amount is worth recommending to other users of this forum, for this money it is worth having it in your small workshop.
    GOPHERT's offer also includes other larger models such as: CPS - 1660, CPS - 3220 or CPS - 6003.

    Remember that when buying from China, our Customs Office may stop the shipment and charge it or impose VAT - I do not know the current amounts at which the office begins to be interested in our shipment.

    Per post # 14 of the user " dive "I corrected the error in the name of the power supply.
    Thank you for being vigilant and pointing out the error.

    Cool! Ranking DIY
    Can you write similar article? Send message to me and you will get SD card 64GB.
    About Author
    grala1
    VAG group specialist
    Offline 
    grala1 wrote 9297 posts with rating 3278, helped 1273 times. Live in city Kalisz. Been with us since 2006 year.
  • #2
    ^ToM^
    Level 39  
    I have already read about these power supplies and for this price group the product is solid (not counting the cables, which may come from a different supplier).

    However, I have a question, what did they send you with, was it regular mail, DHL or another courier, because the delivery time is quite short?
    As for the customs duty - the customs officers' paths are unknown. Once the 100-dollar merchandise passes flawlessly, and the other time, in $ 30, they're clinging. This is a lottery. Technically, it's customs duties from $ 40 - it seems. :)
  • #3
    grala1
    VAG group specialist
    China Ordinary Parcel "Free Shipping via AliExpress Standard Shipping"
    It was not ordered to a Polish address, so I don't care about customs officers.
    I am now waiting for the second package, which was also sent on the same day, has already been in the country for a week (not Poland), but the post office is not in a hurry with delivery.
  • #4
    zster

    Level 28  
    ^ToM^ wrote:
    Technically, it's customs duties from $ 40 - it seems.


    Formally, VAT must be paid on each amount :) But this is where the lottery works (so far) - they will add customs and / or VAT once and not, regardless of the amount ..
  • #5
    jotbegie
    Level 11  
    As for VAT, they already scare you The Polish tax office wants to tax Aliexpress


    What is the convenience of controlling one encoder compared to the "classic" two-potentiometer (coarse and fine, analog). From the description it seems complicated, although being able to adjust the accuracy by changing the comma is ingenious. The disadvantage will probably be the lack of reading during setup, if I understand the description correctly. Well, they saved on the knobs, they could put separate electricity, not some switch.
  • #6
    Eryk1000
    Level 17  
    I have this power supply but in the CPS-6005 0-60V 0-5A version. Now I can say that it's OK for a small workshop. Unfortunately, I had some adventures with him. The Chinese sent him wrapped in an envelope :D just in the envelope without the cardboard box. During transport, he got a few pisses: / I even straightened the panel. In addition, after starting it turned out that only the panel works (lights) and does not provide voltage at the output. It turned out that the induction elements inside are not protected against shocks and they simply gave February. After a few hours devoted to the power supply, it came to life and works until now. It would be nice to calibrate it more precisely, maybe someone has already done it? As it has already been written, the cables need to be improved, and preferably replaced with something more solid, with a voltage drop at 5A.
  • #7
    parafka
    Level 20  
    How about someone reviewing something Polish?
    Recently, I have noticed a flood of advertisements for Chinese products instead of DIY projects.
    Unknowing ads where Asian work and Asian business are reviewed.
    You can trash.
  • #8
    eurotips
    Level 37  
    The design is based on the ST8, so in case of problems there is no possibility of repair.
    Neither the firmware, nor the schematic, nor the service. For the workshop, it is a power supply on an ordinary transformer and one that you can fix it yourself.
  • #9
    ^ToM^
    Level 39  
    parafka wrote:
    How about someone reviewing something Polish?
    Recently, I have noticed a flood of advertisements for Chinese products instead of DIY projects.
    Unknowing ads where Asian work and Asian business are reviewed.
    You can trash.


    DIY projects are in a different section and needlework fans will also find a lot of interesting threads. So something different for everyone.
    Here is a thread about the AE power supply. :)
  • #10
    CMS
    Administrator of HydePark
    parafka wrote:
    How about someone reviewing something Polish?


    Just today I was going to describe the Polish clamp multimeter, but I decided to contact Gulson. We talked for a long time and it turns out that it is not that simple. However, there is hope that reviews of "non-Chinese" products will appear soon.

    parafka wrote:
    Recently I have noticed a flood of advertisements for Chinese products


    These aren't ads, just descriptions / reviews, and that's something else entirely.

    parafka wrote:
    Chinese products instead of DIY projects.


    Maybe it's just that the editors write, test, review, because that's what they are for and that's what their job is for. We have no influence on whether users want to write something. Consequently, the influx of topics from the "articles" section exceeds that from the DIY section.

    Nothing prevents a colleague from publishing some of his constructions.
  • #11
    Karaczan
    Level 41  
    I like the reviews of Chinese miracles.
    They have hundreds of interesting things, albeit of varying quality.
    That's why it's nice to check who has cut what ;)
    Then you can often buy the same products from us, with the logo of the Polish "producer" ...

    I recently bought a laptop power supply. Polish production! Cool, compact, let us earn!
    I open it, I look at the data tag ... Made in China ;)
    I pin it, it's a revelation.
    The coils of the power supply lying on the floor drowned out the not quiet cooling of the paw.
    Marked solders, PCB quality so sensational that in some places it did not survive the improvement of lead-free solders. Chinese 1st class 1 :D But not badly conceived structurally.
    Corrected this and that, flooded coils, extended cable ... It will work bravely. May ;)

    The "Polish producer" did not even give its logo. Even on the box.

    @CMS your 9V charger wins anyway! ;)
  • #12
    electro
    Level 18  
    Is this power supply galvanically isolated? What is the voltage waveform in terms of noise?
  • #13
    ^ToM^
    Level 39  
    electro wrote:
    is this power supply galvanically isolated? What is the voltage waveform in terms of noise?


    Of course he does. Transformer isolation as in any power supply.
    Somewhere on a foreign forum someone checked and the level of interference was normal. Therefore, at this price, I am afraid that you will not buy anything better of such a small size.
  • #14
    domasia
    Level 14  
    Thank you for the review, the power supply arrived yesterday.
    Works great. As for less than PLN 130 - a great thing.
  • #15
    ^ToM^
    Level 39  
    domasia wrote:
    Thank you for the review, the power supply arrived yesterday.
    Works great. As for less than PLN 130 - a great thing.


    Which exact version did you order?

    Best regards!
  • #16
    domasia
    Level 14  
    Hi,
    it says CPS-3205II on the panel.
    Best regards,
  • #17
    millerek
    Level 11  
    Hello, I bought a SPS-3220, I immediately noticed a voltage drop on the wires. Of course, the included cables are not suitable, I changed to new 6mm2 100cm and new crocodile clips, the error decreased to 0.5V around 15V and at 32V the error is about 4V depending on the load.
    Everything is fine on the terminals, of course, there are no errors in the measurements.
    I don't know whether to think about changing the wires, because on YT I found a video about calibrating this power supply.
    There is one problem because we calibrate by measuring voltage and current.
    The voltage is calibrated at 2V 20V and 30V and 2A and 20A.

    Everything is simple but the calibration goes through a 20A load but at a voltage of 32V ...
    I have no idea how and where I should make such an artificial load ...

    The Asian man from whom I bought sent a request to the producer (and in the auction it was written that the seller is the producer), so far there has been silence for a few weeks, and for a minimum of 2 weeks there will be silence because they are now having their new year and celebrating.

    Sorry for the lack of appropriate technical nomenclature, but I'm not an electronics engineer, rather a user of some necessary things related to it. I have been using this power supply recently to charge batteries in EFB technology that need a charging voltage of 17V to a maximum of 17.5V and no rectifier or automatic power supplies are suitable ...

    I would like to add that I looked inside the CPS-3220, it seems to me that the power supply has a probe to measure the voltage at the output at the terminals. There is also a 680uF 35V capacitor, a bit too small, and I think I'll change it to 2200uF 35V or more.
    He adds a picture because if the probe (or something else is it called) can pull these wires out to the frogs at the end of the wires?
    GOPHERT CPS-3205 adjustable switch mode power supply - description and review

    I used to have a small power supply with additional probes that measured and possibly the power supply corrected losses on the wires or with a large load ..