Electricity supplying method and system for universal serial bus apparatus
A universal serial bus and power supply system technology, applied in the direction of electrical components, output power conversion devices, etc., can solve problems such as GSM network card not working properly
Inactive Publication Date: 2009-09-09
TECFACE COMM SCI & TECH SHENYANG
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Problems solved by technology
At the moment when the GSM network card is inserted into the main device, there is no charge on the capacitor C, and the USB power supply needs to charge the capacitor C. At this time, the capacitor C is equivalent to a short circuit. The corresponding equivalent circuit is as follows: figure 2 As shown, resulting in the output current of the USB interface is greater than 500mA
In this case, the operating system of the main device will prompt the user to "USB surge", and may turn off the USB power supply, so that the GSM network card cannot work normally
Method used
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[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.
[0025] Aiming at the problems existing in the prior art, the present invention proposes a USB device power supply method and system, in which a circuit is set in the USB device, and the circuit includes: a second resistor, a switch, a control circuit and a second capacitor; wherein: the switch It is connected in parallel with the second resistor, the first end of the second capacitor is grounded, and the second end is connected to the second resistor. In this way, when the USB device is initially inserted into the host device through the USB interface, the control circuit controls the switch to be in an off state, and the USB power supply in the host device charges the second capacitor through the second resistor, and provides the capacitor to the host d...
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The invention discloses a power supplying method of a universal serial bus (USB) device and the system carrying out the method, wherein the USB device comprises a second resistor, a switch, a control circuit and a second capacitor; the switch is in parallel connection with the second capacitor, a first end of the second capacitor is earthed and a second end of the second capacitor is connected with the second resistor; at the moment when the USB device is inserted into a main device initially, the control circuit controls the switch in a close state, a USB power supply in the main device charges the second capacitor through the second resistor and outputs the current provided to the USB device through the second resistor; when the second capacitor finishes charging, the control circuit controls the switch in a close state, the USB power supply outputs the current provided to the USB device through the switch directly. The method and the system can avoid USB surging at the moment when the USB device is inserted in the main device initially.
Description
technical field [0001] The present invention relates to Universal Serial Bus (USB, Universal Serial Bus) technology, in particular to a USB device power supply method and system. Background technique [0002] With the development of the USB interface technology, more and more devices are provided with the USB interface. The slave device, that is, the USB device, can be inserted into the master device through the USB interface, such as a personal computer (PC, Personal Computer). Moreover, according to the USB protocol, the host device can provide the USB device with a current less than 500mA through the USB power supply, that is, supply power to the USB device. For example, a kind of USB network card, a Global System for Mobile communication (GSM, Global System for Mobile communication) network card uses this method to supply power for itself. [0003] However, the GSM network card usually adopts the burst operation mode, and the instantaneous working current is very large,...
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IPC IPC(8): H02M1/34H02M1/36
Inventor 韩文龙
Owner TECFACE COMM SCI & TECH SHENYANG