微机开关电源的含义-毕业论文外文翻译

中英文翻译

The meaning of computer switching power supply

Switching Power Supply is the use of modern power electronics, control transistors switch on and off the opening time rate, to maintain a stable output voltage power supplies, switching power supply from the general pulse width modulation (PWM) control IC and MOSFET pose. Linear power supply and switching power supply compared with the two costs are increasing output growth, but with different growth rate. Power costs in a linear output power point, but higher than the switching power supply, known as the cost of this reversal point. With the development of power electronics technology and innovation, making switching power supply technology has constantly innovative, cost reverse this point to the increasing output of low-power mobile, switching power supply to provide a broad space for development.

High-frequency switching power supply is the direction of their development, so that

high-frequency switching power supply of small, and switching power supply into a wider range of applications, particularly in the application of high-tech fields, and promote the high-tech products of small, lightweight Of. Also switching power supply in the development and application of energy conservation, resource conservation and environmental protection are of great significance. Switching Power Supply CategoryPeople in switching power supply side is the development of technology-related power electronic devices, while the development of frequency switching technology, the two promote each other to promote the switch power annually to more than

two-digit growth in a light, small, lightweight, low noise, high reliability, Anti-jamming direction. Switching Power Supply can be divided into AC / DC and DC / DC two categories, DC / DC converter which is now modular, design and technology and production technology at home and abroad have been mature and standardized, and have been authorized users, but AC / DC modular, makes its own characteristics in the process of modular, encountered a more complex technology and manufacturing process problems. Following were the two types of switching power supply for the structure and characteristics to set out

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1 DC/DC transform

DC / DC is to transform the fixed DC voltage transformation into a variable DC voltage, also known as DC chopper. Chopper's work in two ways, first PWM Ts the same way, change ton (GM) and the second is the frequency modulation, ton unchanged, change Ts (easily interference). Their specific circuit from the following categories: (1) Buck circuit - buck chopper, the average output voltage U0 less than the input voltage Ui, the same polarity. (2) Boost circuit - Boost chopper, the average output voltage U0 greater than the input voltage Ui, the same polarity. (3) Buck-Boost circuit - buck or boost chopper, U0 average output voltage greater than or less than the input voltage Ui, polar opposite, inductance transmission. (4) Cuk circuit - buck or boost chopper, its average output power U0 pressure greater than or less than the input voltage Ui, polar opposite, capacitance transmission. Today's technology allows soft switching DC / DC has undergone a qualitative leap forward, the United States VICOR companies design and manufacture of a variety