You should see if you can measure the current draw when using the 4.5V power supply.
At the output of the 3.7V power supply, connect a load resistor to see if the power supply can take the load. Try with 2Ω resistor. That will mean a current draw of 1.85A. See if the power supply LED is on or it blinks. This way, you'll be certain if the power supply is ok or not.
One way of knowing if it's linear or switching will be by considering its weight. A linear power supply should be much heavier than the switching one as the linear one will have a heavy transformer and a linear regulator with heatsink. The switching one will be based on an SMPS circuit, which will use ferrite transformer and will have smaller heatsink(s) due to greater efficiency.
Hope this helps.
Tahmid.
Oh by the way, the power supply is as small as the old Nokia cellphone chargers and are very light. Am I sure that this is a switching power supply then?
Start with 1000-1500 mA and see what happens. One other possibility is that the current sensor in the power supply could be damaged, so the current readings are not proper and the power supply stops working at a current lower than it was rated for.
It might be, but you may be better off buying a new power supply. Depends on you though.
If you can't find one, you may be able to build one for yourself. Or you can use a DC-DC converter circuit that will provide 3.7V output with more common input voltages such as 12V.
I'm not too confident building one myself. Are you suggesting I make a DC-DC converter or purchase one?
Whichever is convenient for you. If you are not too confident building one, it's better you purchase one.
If you can not find a fixed voltage output device, you may use one with a variable voltage and you can adjust the output to 3.7V.
Here's one such device: **broken link removed**
Here's more: **broken link removed**
https://www.amazon.com/Tekpower-Variable-Supply-1-5-15-HY152A/dp/B000RO8J98
https://www.cybermarket.co.uk/shop/power-supplies/bench-top-power-supplies.html
https://www.circuitspecialists.com/bench-power-supply-csi1802x.html
Hope this helps.
Tahmid.
If you have a 12V power supply, like I said before, you can use a DC-DC converter like this: **broken link removed**
You can use a 12V power supply, such as this one: **broken link removed**
No, the capability of the DC-DC converter is set by the converter itself and the limitation of the power supply. The converter specifies a maximum capability of 3A.
The capability of the 12v supply is 3A. So, maximum power output is 36W. When converted to 3.7V, that equates to a current of 9.73A (if efficiency = 100%). So, a DC-DC buck converter can draw up to nine point something ampere and still be within limit of the power supply capacity.
The converter is rated at a maximum of 3A and this is less than the 9A I calculated.
Hope this helps.
Tahmid.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?