Universal serial bus host interface used in protective-relay device

A universal serial bus, relay protection device technology, applied in the direction of electrical digital data processing, instruments, etc., can solve the problem of inconvenient data interaction, and achieve the effect of cost saving and simple operation

Inactive Publication Date: 2009-01-07
JIANGSU WISCOM TECHNOLOGY CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This way of data interaction is very inconvenient, especially during on-site maintenance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Universal serial bus host interface used in protective-relay device
  • Universal serial bus host interface used in protective-relay device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] figure 1 It is the schematic circuit diagram of the present invention. The AT91RM9200 chip provides a USB host interface, HDMA and HDPA are serial data transmission lines, and the first resistor R1 and the second resistor R2 are used for impedance matching of the line. In order to prevent the USB host from always detecting the connection of the slave, a pull-down third resistor R3 and a fourth resistor R4 are added to the transmission line. Capacitors, inductors and other devices in the circuit play a role in anti-electromagnetic interference. This interface also provides a 5V DC power supply for the USB storage device.

[0012] Specifically, the AT91RM9200 chip U1 is used to provide the serial data transmission line of the USB host interface through its "HDMA" and "HDPA" pins. "HDMA" and "HDPA" are respectively connected to the USB host through the first resistor R1 and the second resistor R2. The "2, 3" pins of the interface terminal J1; at the same time, the "2" p...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention is based on ARM9 chip and USB host interface and is used for completing hot plug of external USB storage device; based on an embedded operation system, the user interaction interface program is written to realize the read-write to USB storage device The invention uses AT91RM9200 chip whose 'HDMA' and 'HDPA' pins provides USB host machine interface function; +5V power is connected to pin'1'of the USB host machine connector through a filter circuit composed of third capacitor and fouth capacitor and inductor to provide USB positive power; pin '4'of the USB host machine connector is grounded.

Description

technical field [0001] The present invention is a kind of construction circuit based on ARM9 chip USB Host interface, realizes the hot swap to the external USB (universal serial bus) storage device, writes the corresponding user interaction interface program on the basis of the embedded operating system to realize the external The reading and writing of the USB storage device can achieve the purpose of burning the device execution program and exporting the internal data. It provides convenience for external data exchange and engineering maintenance of power system protection devices. It belongs to the technical field of power system automation devices. Background technique [0002] During the production and on-site engineering maintenance of power system automation devices, engineering personnel often burn the execution program for the device. They usually use an external programmer, or use a computer (portable) to communicate with the device through the serial port to real...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityPatents(China)
IPC IPC(8): G06F13/40
Inventor仲伟丁宁董雪鹏叶留金吴參林詹利群
OwnerJIANGSU WISCOM TECHNOLOGY CO LTD