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 [令和二年十二月二十一日(2020/12/21]
XYS3580アダプタ 自家製DC電源を改造  [English Note]

以前、メータを「アナログ」から「デジタル」へ、そして更に「アナログ」へ戻した経緯がある「自家製DC電源」を、今回、更に、"(μC制御)デジタル表示式"に改造した。
理由は、小数点以下2桁目の"電圧値"を見たかったのと、偶に、(精度の高い)30V電圧が欲しい時に備える為だ。

実は、この前に、"デジタル式DC電源ジャンク"を買ったのだが、それを壊してしまったので、それの修理パーツを探していた。その途中で、目に留まったものだ。

此の"DC-DC-CONVタイプ・アダプタ"の面白い処は、"入力電圧"が固定であっても、電流容量さえあれば、幅広い任意の"出力電圧"が取り出せる点だ。
手元には、(ジャンクで買った)"定電圧のスイッチング電源基板"が数種あるので、それと組み合わせれば、簡単に"可変DC電源"が作れるわけだ。
しかし、それらを入れる"ケース"を探していて、良いものが見付らず...それに、新しく作るのは無駄で、今ある「自家製DC電源」を改造すれば簡単だと、気付いたわけだ。

この「XYS3580」は、「AliExpress」で、最も低価格のものを探して、それを買った。($20.53送料込み 当時の為替レートがよく分からないが、およそ¥2,200程度か?)
(「YouTube」には、使い方などの色々な動画が上がっているようだが、本品は"μC制御"なので、多種多様な制御が出来るらしいので、参考にさせて貰おう)

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+++ 嵌め込み枠に無駄な細工 +++

元の「自家製DC電源」のアナログ・メータを外してから、「ハンド・ニブラ」で四角い窓(約77mmx39mm)を穿ったのだが、リード線を付けて差し込む段になって、そのままでは入らないことが分かった。(図4[クリック])
もし、数Aの電流を取り出すつもりなら、太いリード線を使わねばならないが、それを付けておくと窓から入らないってこと!
止むを得ず、その個所だけ"削り増し"をした。(図3)

当初から気になっていたのだが、ここには、"向きを間違えた端子台"を使ったのではないかと思う。
これを、四角窓に嵌め込もうとすると、太いリード線が邪魔になることは自明だからだ。
リード線の太さだけ、窓を"削り増し"すれば済む話だが、それは"綺麗"ではない!
(形が綺麗なものは、良く働く!)
むしろ、リード線は、後ろに引き出すのが、スマートで望ましい。



+++ 収納状態、入力電圧の設定 +++

実は、このケースは、昔から色々な実験回路を組み込んでは、バラして再活用して来た。
その為、周りは孔だらけだ。
でも、その都度役に立ってくれているから、(私にとっては、)有り難い箱だ。z(^^;
収まり具合も、ちょうど良さそうだ。(多少の余裕はあるけど)(図5)

入力用の電源部は、20V,2Aだが、電圧を下げて電流を増やすことは可能なので、12V,3Aくらいは取り出せると思う。(ただし、現在は、約15Vの調節してある)
今まで、当苑で、そんなに大きい電流を連続的に流した経験は少ないので、実験用には、これで十分間に合うだろう。
後は、こうした多機能型の"使い勝手"がどれだけ良いか、だろうな。


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[2020/12/21]
XYS3580 adapter Modified homemade DC power supply

" Homemade DC power supply ", which has a history of returning the meter from "analog" to "digital" and then to "analog", is now added to " Remodeled to digital display type ".
The reason is that I wanted to see the "voltage value" in the second decimal place, and I happened to be prepared when I wanted a (highly accurate) near 30V voltage.

Actually, I bought " Digital DC power supply junk " before this, but I broke it, so I was looking for repair parts. On the way, it caught my eye.

The interesting thing about this "DC-DC-CONV type adapter" is that even if the "input voltage" is fixed, a wide range of arbitrary "output voltages" can be taken out as long as there is a current capacity.
I have several types of "constant voltage switching power supply boards" (bought at junk) at hand, so if I combine them, I can easily make a "variable DC power supply".
However, I was looking for a "case" to put them in and couldn't find a good one. ... Besides, I realized that it was useless to make a new one, and it would be easy to modify the existing "homemade DC power supply".

This " XYS3580 " is " AliExpress ", I searched for the cheapest one and bought it. ($ 20.53 shipping included. I don't know the exchange rate at that time, but is it about \ 2,200 ?)
(In " YouTube ", How to use it, etc. It seems that various videos have been uploaded, but since this product is "μC control", it seems that a wide variety of controls can be performed, so let me refer to it.)

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+++ Useless work on the fitting frame +++

After removing the analog meter of the original "homemade DC power supply", I pierced a square window (about 77mmx39mm) with a "hand nibbler", but it became a stage to insert with a lead wire, so it can not be entered as it is. (Fig_4 [click])
If I'm going to draw a few amperes of current, I'll have to use a thick lead, but with that I won't be able to get in through the window !
I had no choice but to scrape only that part. (Fig_3)

I was worried from the beginning, but I think I used " terminal block in the wrong direction ".
This is because it is obvious that the thick lead wire will get in the way when I try to fit it in the square window.
It's a story that I only have to "shave" the window by the thickness of the lead wire, but that is not "beautiful" !
(Things with beautiful shapes work well !)
Rather, it is smart and desirable to pull the leads to rear direction .



+++ Storage state, input voltage setting +++

In fact, "this case" has long been reused by incorporating various experimental circuits.
Therefore, the surrounding area is full of holes.
But it's a nice box (for me) because it's useful each time. z(^^;
The fit seems to be just right. (Although there is some margin) (Fig_5)

The power supply for input is 20V, 2A ( but I adjuseted about 15V), but since it is possible to lower the voltage and increase the current, 12V, I think I can take out about 3A .
Until now, I haven't had the experience of continuously passing such a large current at this garden, so this should be enough for experiments.
After that, I wonder how good such a multifunctional " usability " is.


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