2012年2月9日星期四

The use of switch power supply and introduction


The use of switch power supply and introduction
Switch power supply products widely used in industrial automation control, military equipment, scientific research equipment, LED lighting, industrial control equipment, communications equipment, electric power equipment, instrument and apparatus, medical equipment, semiconductor refrigeration heating, air cleaner, electronic refrigerator, LCD monitor, LED lighting, communications equipment, audio-visual products, security, computer case, digital products and equipment class, etc.
introduction
Along with the power electronic technology high speed development, the power electronic equipment and people's work and life of increasingly close relationship, and electronic equipment is inseparable from the reliable power supply, into the 80 s computer power achieve of switch power supply, the first complete computer power generation, in the 90 s switching power supply are entering the field of various electronic, electrical equipment, process

Switch power supply


Switching power supply is to use modern power electronic technology, www.siliconray.com control switch tube opened and shut off the time ratio, maintain the stable output voltage of a power supply, switching power supply general by pulse width modulation (PWM) control IC and MOSFET composition. Switch power supply, linear power supply and compared to the cost of both as the output power increases, but both growth rate each different. Linear power cost in a certain output power point, but higher than the switch power, this is called cost reversal points. Along with the power electronic technology development and innovation, making the switch power technology is in constant innovation, the cost low output growing point to reverse the power move, the switch power supply provided a broad space for development

2012年2月6日星期一

How to quick and good learning ARM? Have development board


How to quick and good learning ARM? Have development board
1, learn how to download the Bootloader, through computer installed in a ADS1.2 software; DEMO development board has a ADS engineering documents, can through the ADS is open, you make a file compiler, through the JTAG download to development board.
2, learn how to download
WINCE, development board with specifications, through the "super terminal" step by step and do.
3, learn how to download Linux, development board with specifications, through the "super terminal" step by step and do.
4, you can also play not WINCE and Linux, then you will have to buy a simulator, like playing 51 SCM, control ARM, and also through ADS software design and simulation.
Of course premise condition is: you must C language more skilled, understand the operating system, the bookstore has a book, you can be in accordance with the above step by step operation, through the experiment will soon learn!

How to buy SCM development board


Want to learn 51 SCM, don't know what to buy good development board, taobao many, various types of all have, and takes the color, don't know which to buy. Buy any of the recommended a development board, had better be practical, incidental tutorial easily to learn, can do more than the best. In addition to recommend the practical intro book better, thank you. Problems added:

Color is not useful? As is common LCD practical.

General flowing water lamp, digital tube, matrix keyboard, independent keyboard, liquid crystal, a buzzer, the I2C is about the same, all get through to the single chip is about introduction, the practicality of the color is not big, general test plate on the 8 * 8 dot matrix also can show simple letters Numbers...
As for the book, GuoTianXiang recommend the new concept 51 SCM C language tutorial, introduction, improve, the development, the development QuanGongLve"
Hope that the above information will help you



LCD and LED the most fundamental difference?


Don't know what you say is television screens, if is TV words difference between (you first search LCD display principle, the mobile phone is not convenient for typing), led TV is using led back light, the use of common LCD similar energy-saving lamps back light, in addition to back light other are the same. Of course the former slightly better than the latter.
And cell phone led display is usually refers to oled, show principle and LCD has essential difference, LCD itself not to shine, and through the filter light to realize and colorful, and their own can emit light oled color to achieve and colorful.

At present DaBing oled technology still not mature, so the TV screen is still LCD technology, just used the luminous efficiency higher led as a back light, and small screen oled, has been used, such as samsung mobile phones i9000.
Hope I answer you can