USB power or charger function
RVT02 Posted messages 39 Status Membre -
Hello, I would like to know if, instead of using my old standard power adapter 220V / multi-voltage 1.5V - 3V - 4.5V - 6V - 7.5V - 9V - 12V set to 5V, I could use a USB charger socket 220V / 5V.
The device that needs to be powered with 5V is not a smartphone, but it can only be powered by a USB socket (no other type of power socket has been provided).
The goal is to avoid adding (or tinkering) an adapter to the cable of my multi-voltage adapter to equip it with a USB socket.
My device that requires 5V power through a USB socket does not have any indication of the necessary power; to measure the current intensity, it would require using a smartphone power USB cable with an ammeter inserted.
All I know is that the current supplied through the USB socket of my computer is not sufficient; the device does not work when connected to the USB socket of the computer.
So I thought about these smartphone charger sockets that can be found everywhere; they are very compact and are designed to deliver 5V.
But their primary function is to charge a smartphone, with an internal device to regulate the charge; my power needs to be constant and must run for hours without interruption.
The USB socket is increasingly used to power a device; there is no longer a jack connector.
Can a USB charger 220V / 5V be intended to power a device that does not recharge continuously?
It probably depends on the current intensity required, and whether there is a current or duration limitation device.
The wall socket 220V converters that have USB sockets allow you to charge a device or just power it, but probably without a regulation device for current intensity or duration.
What do you think?
3 réponses
I was able to measure the consumption: 120 mA. So, it's a bit too much for a USB2 connection, and since there is no communication between the devices (it's not about charging a battery), the amperage doesn't increase with USB3 either. Unless there's a software workaround to make the computer deliver more than 100 mA (which is not easy to achieve), my only option left is to buy a USB charger plug 220V/5V (1A will be more than sufficient). Moral of the story: Although powering via USB plug is becoming more common, power from a computer's USB port is not always viable.
Hi
5v * xAmperes = wWatts.
You can't touch the v though, for those who can do more can do less for the A, so the Watts. The power supply can deliver more but not less.
You need to choose a wall socket model with enough amperes, they are not all the same. 0.5A per socket? 1A per socket? About 2A per socket? About 3A per socket? And be careful with those that advertise a big number but each socket only provides 2A.
So you can continuously power a 5v device without a non-recharging battery.
Is the plug required by your device there?
Is it a simple usb? There are several variants, the one from your pc is not enough.
Is it a usb-C? Many more Amperes can and must therefore be provided in this case.
But as soon as you plug in a device containing a battery, you need a smart charger that communicates with it. The trick is to use a higher voltage to go through the cables and plugs, and the charging or consuming device lowers the voltage.
With 2 wires, it's hard to provide much more than 3A, so 15-18 watts at 5v.
The material of the wires, the pins, and especially the diameter are important.
With 4 wires and some wiring tricks on the sockets, you can double it.
People often talk about 30 watts but there are already devices that require more than 100w. Even the cables are special.
https://www.frandroid.com/comment-faire/comment-fonctionne-la-technologie/391724_tout-savoir-sur-lusb-type-c-ce-nouveau-connecteur-unifie
Really no way to get an idea of what this device is? No brand model reference label?
Hello Luc,
The device in question is a mini audio amplifier delivered with a jack / USB Type A cable.
In fact, on the amplifier itself, it is a female jack socket (contrary to what I wrote earlier) but which, through the supplied cable, requires connecting to a USB Type A power supply.
This is how I was able to test by connecting this amplifier to a USB Type A port on my computer; it does not work (probably not enough current)
I was also able to test with my multi-voltage power supply (with a max of 1A) connected this time directly via a jack plug to the amplifier; it works (sufficient current).
Rather than monopolizing my large multi-voltage power supply, I would have liked to use these types of phone chargers that are much less bulky and would allow me to connect my jack / USB Type A cable.
I do not wish to cut the jack / USB cable supplied with the amplifier to insert an ammeter, nor do I want to cut the cable of my multi-voltage power supply.
Here is the amplifier (no current or power indicated):
https://fr.aliexpress.com/item/1005001798965126.html?spm=a2g0o.order_list.order_list_main.15.14675e5b8rLImU&gatewayAdapt=glo2fra
My question is mainly to know if a USB phone charger can work without time limitation or current regulation on a device like an amplifier, whereas it is supposed to only work for the duration of the phone battery recharge.
P.S.: I will try to find a suitable male jack plug with the amplifier, to be able to insert my ammeter between the cable of my multi-voltage power supply and the amplifier.