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Anti-interference method for USB equipment

A device and diode technology, applied in the application field of USB KEY, can solve problems such as computer USB power fluctuations and interference devices

Inactive Publication Date: 2011-06-29
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Generally, computers have multiple USB interfaces. When a USB device is working on the computer, if another USB device is connected to the computer, it will cause the computer’s USB power supply to fluctuate, thereby interfering with the working device. Therefore, it is necessary to design an anti-interference The circuit ensures that the USB device works normally

Method used

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  • Anti-interference method for USB equipment

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Embodiment Construction

[0007] The present invention will be further described below in conjunction with the accompanying drawings.

[0008] On the power pin of the USB connector, connect a forward diode in series, and connect a power filter capacitor in parallel to the ground between the diode and other devices in the USB device.

[0009] Using the principle of forward conduction and reverse cut-off of the diode, when the USB device is working normally, the diode is forward conduction, and the power supply provides energy to other devices in the USB device. In order to ensure the power supply voltage of other devices in the USB device, usually use Turn on diode with low voltage drop. At the same time, the capacitor stores charge. The capacitor has two functions, one is to improve the power quality of other devices in the USB device, and the other is to store energy. When the diode is reversed, the capacitor provides energy to other devices in the USB device.

[0010] When other USB devices are con...

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Abstract

The invention relates to an anti-interference method for USB equipment, which comprises the steps that a forward diode is accessed into a power source pin of a USB adaptor through series connection; and a power source filter capacitor is connected in parallel between the diode and other devices in the USB equipment in an over-the-ground manner. In terms of the forward conduction and reverse blocking principle of the diode, when other USB equipment is accessed to a computer, a USB power source is reduced instantly, the diode is in a reverse blocking state, and the power for the other devices in the USB equipment is supplied by the capacitor. Therefore, the normal work of the other devices in the USB equipment can not be affected by the reduction of the power source.

Description

technical field [0001] The invention relates to the technical field of USB KEY application. Background technique [0002] Generally, computers have multiple USB interfaces. When a USB device is working on the computer, if another USB device is connected to the computer, it will cause the computer’s USB power supply to fluctuate, thereby interfering with the working device. Therefore, it is necessary to design an anti-interference The circuit ensures that the USB device works normally. Contents of the invention [0003] On the power pin of the USB connector, connect a forward diode in series, and connect a power filter capacitor in parallel to the ground between the diode and other devices in the USB device. [0004] Utilizing the principle of forward conduction and reverse cut-off of the diode, when the USB device is working normally, the diode is forward conduction, and the power supply provides energy for other devices in the USB device. The capacitor has two functions...

Claims

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Application Information

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IPC IPC(8): H01R13/719G06F13/38
CPCY02B60/1235Y02B60/1228Y02D10/00
Inventor 李丹
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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