USB hub starts from Power Supply

Mouse, keyboard, flash memory, mobile hard drive, USB Desk Lamp, fan, who has no more than seven or eight USB devices at home, are embarrassed to tell people that they have bought a computer at home. However, if there are so many devices and the computer port is not enough, power supply is a problem. Therefore, buy an active USB hub to free the external USB device from the USB port power supply restrictions, is the way to solve the problem. However, if you select USB hub, you should pay attention to the power supply. If the power supply is not powerful, everything will be useless, and even your USB device will be burned out, damaging the USB interface of your computer.

 Step 1: View Current

We know that the maximum power supply current of the motherboard USB port is 500mA, but some active USB hubs are equipped with an adapter of 300 or 400 Ma. The current is smaller than that of the motherboard USB hub, and the driving capacity is very low, it is better to directly use a passive USB hub.

Therefore, when purchasing a USB hub instance, you must first check the output current of the adapter,The adapter with an output current of 1.5a can meet the needs of two mobile hard disks simultaneouslyIf you have more USB devicesThe current of all devices is added (the standard device has a nominal current value on the nameplate) and multiplied by 1.2.To ensure a certain margin of power supply, and then select the hub adapter based on the total data.

 Step 2: view the voltage

If an active USB hub is used, the safety of the device is maintained on the adapter. If the output voltage of the adapter is unstable, the device will be light, not working, and then burned out in smoke. So how can we monitor the voltage of the adapter? For those who are familiar with the electronic knowledge of A multimeter, you can use a multimeter to test the voltage of the USB hub when the device is not connected or the device is fully occupied, check whether it is stable in the range of 5 V ± 5%.

What should a friend without a multimeter do? It doesn't matter. Just take a look. You can first plug in and enable the USB desk lamp, and then plug in other devices in sequence. At this time, observe the brightness of the USB desk lamp. If you are accessing the device, in particular, when the USB desk lamp is connected to a mobile hard disk, the performance of the adapter is poor when the light fades or flashes. This is a potential threat for USB devices.

 

Step 3: View workmanship

For an excellent adapter, it must be well-developed internallyOver-current, over-voltage, and short-circuit protectionAnd many other protection circuits to ensure their security. But when we buy a USB hub, we cannot open the adapter. Let's look at the internal structure. Since we can't see the heart, we can only look at people by appearance, and carefully check whether there is a glitch outside the adapter, whether the workmanship is fine, and whether the wire diameter of the output is thick enough, if these basic requirements do not work well, the adapter must be cut corners and cannot be purchased. Of course, if conditions permit, large-brand adapters, such as Belkin and King racing, are the best choices.