USB powerbank with pure 5V output

[Baluncore]

At least as likely, the label could indicate the output rating, 36VDC @5Amps.
Or 36Watts 5VDC.
A clue is the voltage rating of the capacitors at the DC output, 50V... so more likely 36V output.

There are too many possibilities, with insufficient information to make any rational deduction.
There is even less evidence that guessing might actually help anyone. No one needs to know.

Why is it called switching? what switches?

This is not the place for a beginners question driven tutorial on a subject that takes a year to understand properly.
As a novice, you need to trust the technology, or begin a study of switching converters.
Follow the tutorial in the above post or go to;
https://en.wikipedia.org/wiki/Switched-mode_power_supply

 

[new6ton]

There are too many possibilities, with insufficient information to make any rational deduction.
There is even less evidence that guessing might actually help anyone. No one needs to know.This is not the place for a beginners question driven tutorial on a subject that takes a year to understand properly.
As a novice, you need to trust the technology, or begin a study of switching converters.
Follow the tutorial in the above post or go to;
https://en.wikipedia.org/wiki/Switched-mode_power_supply

You are right. But which is safer to use on a very expensive laboratory equipment for permanent lab setting (to protect the investment). A DC/AC switching adaptor or a 12v battery and 12vto 5 v DC converter like the following:

https://www.meanwell.com/webapp/product/search.aspx?prod=DDR-15

click image to enlarge it

 

[Baluncore]

But which is safer to use on a very expensive laboratory equipment for permanent lab setting (to protect the investment). A DC/AC switching adaptor or a 12v battery and 12vto 5 v DC converter like the following:

They are equally unlikely to cause an over-voltage problem.
It is 100 times more likely that expensive equipment will be stolen.

 

[new6ton]

They are equally unlikely to cause an over-voltage problem.
It is 100 times more likely that expensive equipment will be stolen.

But technically. The DC to DC converter would be more safe because in the even the converter is damaged, the overvoltage would only be 9V or 12V (the battery) instead of full 110 volts. In average use. You are right that it is 100 times more likely it would be stolen.

But it would matter if it would be used as a tactical equipment, to detect chemical warfare residue or explosive traces. In such case then the DC to DC converter would be more appropriate. Correct? Not that I'll use it on them but just asking. And all spectrometers are controlled for export to North Korea because they have military use too.

 

[davenn]

The DC to DC converter would be more safe because in the even the converter is damaged, the overvoltage would only be 9V or 12V (the battery) instead of full 110 volts.

HUH ?? where did you get the 110V from in a DC - DC converter ??

 

[Baluncore]

But technically. The DC to DC converter would be more safe because in the even the converter is damaged, the overvoltage would only be 9V or 12V (the battery) instead of full 110 volts.

No.
110 Vrms AC is rectified to 155 V DC. We still have 240 Vrms which gives 340 V DC. I have been designing, building and servicing switching supplies for over 40 years. A failure in the HV circuit has always blown the fuse, sometimes it has shattered semiconductors, but it has never jumped to the isolated low voltage output.

On the other hand, a DC-DC converter is usually not isolated. A short circuited switch failure is more likely to connect the input voltage to the output through the inductor. That over-voltage should be detected by a crowbar circuit which will short the output and so protect the load, quickly blowing the fuse.
https://en.wikipedia.org/wiki/Crowbar_(circuit)

 

[rbelli1]

the overvoltage would only be 9V or 12V

Which may be just as destructive depending on the equipment as 115VAC.

a DC-DC converter is usually not isolated.

Meanwell DDR ones are.

If you are still concerned, get a medical power supply with a cardiac float rating.

https://recom-power.com/en/applications/medical/medical-power-supplies.html?0

You can literally bet your life on that not frying the equipment.

BoB

 

[new6ton]

HUH ?? where did you get the 110V from in a DC - DC converter ??

I meant "the overvoltage would only be 9V or 12V (the battery) instead of full 110 volts (if an AC/DC switching adaptor used, at least I thought so initially).

Btw. the Spectrometer I have is mostly optics. The only components that need the 5V is the laser and CCD. The laser can be replaced by a hole at the side of the unit. Does anyone know what kind of CCD has this spec?

Linear CCD Array	Linear CCD Array
Pixel Number	3648
Pixel Size	8 μm x 200 μм
Dark Current	630 e/pixel/s
Readout Noise	30 e rms
Dynamic Range	2100
Max Quantum Efficiency	90%
Integration Time	10 ms – 500000 ms

This is what composes a raman spectrometer (mine doesn't have a TE cooler or any fiber optics, the one below costs $65,000). Can you make the components less than $16,000? I think my supplier can assemble them for less than $1,000. What is your opinion? Note the software is only one time deal for all their products. It's like Apple creationg the IOS for all Iphones units and not each individually programmed.

 

[Tom.G]

Hamamatsu is a major supplier of line sensors, TI used to make some but I couldn't find any in a brief search. Since line sensors are used in flatbed scanners, other possibilities are HP (Hewlett-Packard) and Canon.

Here is a link to the Hamamatsu catalog:
https://www.hamamatsu.com/resources/pdf/ssd/image_sensor_kmpd0002e.pdf
above found with:
https://www.google.com/search?&q=Hamamatsu+ccd+linear+sensor
Cheers,
Tom

 

[sophiecentaur]

If the spectrometer is that expensive then why not spend a bit more money and use the manufacturer's recommended supply unit? If you are really worried about what could happen when there is a power supply fault then read the bit in the manual which tells you about the warrantee being void if you don't use the right PSU.

 

[anorlunda]

The OP question has been flogged to death. Thread closed.