Due to the different design of different USB3.0 motherboards, the onboard USB port provides different power supply methods. Generally, there are the following types: 1. The USB power supply is the same as the keyboard / mouse 1. Select + 5V or + 5VStandBy by the jumper. When + 5VStandBy is used, the power supply capability of the USB interface is very limited (but the advantage is that the USB interface can also be powered even when it is turned off and can be used to charge some handheld devices). This jumper is usually "Allow / Forbid Keyboard Start". 2. The + 5V power supply is used to supply power to the interface through a triode, the power supply mode is controllable, and the current is limited (usually the power of the triode itself limits the output capability). The output end generally has a self-recovery fuse, and the fuse current of the fuse should be less than the limit current of the triode. 3. It is directly connected to the + 5V power supply, and overcurrent protection is provided by a series of self-recovery fuses. The current that can be provided is usually large. For example: on the Gigabyte GA-6OXT motherboard, the normal working current of the self-recovery fuse is 2.5A, and overload protection The current is 4.7A. 4. Choose whether to connect to + 5V through a triode or directly to + 5V through a jumper. When selecting to connect to + 5V through a triode, the situation is the same as point 2 (limited by the output power of the triode, connected in series The self-recovery fuse is matched with the triode); when choosing direct connection, it also depends on whether the same self-recovery fuse is used with the former. If so, the power supply current will not be large. If it is independent, then the situation is similar to point 3. 5. The keyboard, mouse and USB power supply are not together. The keyboard and mouse are directly connected to the power supply + 5V through the fuse resistance, and the front and rear USB interface power supply is supplied by the transistor. Such as: Jetway PR22-S. Second, the USB power supply part is independent 1. The + 5V power supply is powered by a triode, the power supply mode is controllable, and the current is limited (usually the power of the triode itself limits the output capability). The output end generally has a self-recovery fuse, and the fuse current of the fuse should be less than the limit current of the triode. 2. It is directly connected to the + 5V power supply, and the overcurrent protection is provided by a series of self-recovery fuses. The current is usually larger. Under the design of USB interface independent power supply, the “allow / forbid keyboard boot†jumper has nothing to do with the power supply capability of the USB port. The design that should not appear under normal circumstances is: USB independent power supply, but the connection is + 5VStandBy; there is no self-recovery fuse connected in series in the USB power supply circuit (if there is a short circuit, the impact is extremely large). The front USB interface of the computer is also connected from the motherboard. Generally speaking, there are two options for the power supply method of the front USB port: one is the same as the power supply method of the rear port, and the other is directly connected to + 5V (to be connected in series (Resettable fuse). However, the real power supply capacity of the front interface, including the actual transmission speed, is also subject to the quality of the connecting line and the plugs in the middle links. Some methods to judge the type of USB power supply from external phenomena: If the onboard USB interface is controllable power supply, the light of the USB optical mouse is off when it is just turned on or after the machine sleeps. Only when the system starts to load or enter the normal working mode, the light of the optical mouse will be on; and the USB interface uses a + 5V direct supply motherboard. As soon as the power is turned on, the light of the USB optical mouse will be on, in the sleep state It will not go out; the USB interface uses a + 5VSB direct power supply motherboard. It cannot be turned off or sleep. The lights of the USB interface optical mouse and PS / 2 interface keyboard mouse will always be on. 3. Interface power supply method of USBUSB3.0 expansion card 1. Power is supplied through a controllable power module with overcurrent protection. I have a USB2.0 expansion card in my hand, providing four USB ports, using two AIC1526 chips for power supply, I checked the information, this chip is dedicated to the power supply of the USB channel, each chip can provide two channels, 500mA per channel Current. 2. It is directly connected to the + 5V power supply, and overcurrent protection is provided by a series of self-recovery fuses. Many cheap expansion cards on the market do this. Fourth, use another USB interface as an auxiliary power supply port According to the general Lenovo, each interface is 500mA, and when I connect two interfaces, I should have a power supply capacity of about 1000mA. Any two USB ports connected are the same performance-but it is not the case. Usually, the power supply of the USB interface is a USB Host Hub supporting two USB interfaces, using the same power supply. If there are only two onboard USB ports on the rear (or front) of the motherboard, the power supply should be taken from the same power source. No matter whether one or two USB devices are used, the total power supply current is limited to a certain range, especially It is more obvious when the power performance of the PC is poor or when a power supply with a small power is used. If we use an external USB device that consumes a lot of power (a large-capacity, high-speed 2.5-inch USB3.0 mobile hard disk), even if both USB ports are connected, it may not be able to achieve the effect of 500mA + 500mA. However, if the rear (or front) onboard USB interface is four or six, this problem can be avoided, but be careful not to connect it to the two ports that come out of the same USB Host Hub. When it has been connected to some two USB ports, but it does not work properly, you can try to change the position of the auxiliary power supply interface, maybe it can be solved. When using a USB 2.0 expansion card, you can usually refer to the above principles. But sometimes there are different situations: the above-mentioned card using AIC1526 power supply, the first piece 1526 is supplied to Port1, Port2, and the second piece 1526 is supplied to Port3, Port4. After connecting an external USB3.0 mobile hard disk box to Port2 , Port3, there will be insufficient power supply, but if it is connected to Port1, Port3, everything is normal, it stands to reason that two channels on an AIC1526 can provide 500mA of current, not to mention that when connected to Port2, Port3, two 1526 chips supply power together There is no problem that the total supply current of the same chip is large, which causes heat generation-especially when it is switched to Port1 and Port3, it is still powered by two chips, but the other channel of chip one is used. It can only be explained that the two channels of the power supply chip may have asymmetric power supply in the design, but the card circuit has not been analyzed in depth.
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