河南科技大学毕业设计（论文）
DESIGN OF A MICRO-COMPUTER SWITCHING
POWER SUPPLY BASED ON TL494
ABSTRACT
With the development of switching power supply in the field of computer ,
correspond, aviation and astronautics , instrument appearance and electrical production
etc, the demand of the production are increasing as people need ,and people have
brought forward higher request to aspect such as the power efficiency , bulk factor, and
reliability. The switch power not only volume is small but also efficiency is height,
weight makes light, which are substituting the inefficient, both stupid and serious
linearity power in many aspects step by step.
With the electric power electronic technology development, especially high
efficiency device of IGBT and the MOSFET rapid development, the switching power’s
performance develop various and its cost is becoming cheaper and cheaper, people
could accept the new switching power. The information technology development also
set a higher request to the power source technology, thus promoted the switching power
technology development.
The microcomputer power usually adopts pulse width modulation switching power
supply. This subject introduces a kind of PWM technology based on half bridge type
microcomputer switching power supply. It is through the use of drive IC TL494 control
of the pulse of PWM switch conduction to control dc output. In this paper the
microcomputer switching power supply filter circuits, auxiliary power, PWM control
and drive circuit, multi-channel DC voltage output circuit, automatic control circuit of
detailed design method and design ideas, and detailed circuit.
KEY WORDS: IGBT，PWM，switching power, drive circuit，rectify
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