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人们在开关电源技术领域是边开发相关的电力电子器件，边开发开关变频技术，两者相互促进推动着开关电源每年以超过两位数字的增长率向着轻、小、薄、低噪声、高可靠、抗干扰的方向发展。开关电源可分为AC/DC和DC/DC两大类，DC/DC变换器现已实现模块化，且设计技术及生产工艺在国内外均已成熟和标准化，并已得到用户的认可，但AC/DC的模块化，因其自身的特性使得在模块化的进程中，遇到较为复杂的技术和工艺制造问题。以下分别对两类开关电源的结构和特性作以阐述
6ES7315-2EH14-0ABO
DC/DC two categories, DC/DC converter has realized modularization, and the design technology and production process at home and abroad have been mature and standardized, and has been recognized by users, but the modularization of AC/DC, because of its own characteristics in the process of modularization, encounter more complex technology and process manufacturing problems. The structure and characteristics of the two types of switching power supply are described below
DC/DC conversion is the conversion of a variable DC voltage into a fixed DC voltage, also known as DC chopper. Chopper working mode has two, one is the pulse width modulation mode Ts unchanged, change ton(universal), the other is frequency modulation (
(1) Buck circuit – buck chopper, the output average voltage U0 is less than the input voltage Ui, the polarity is the same.
(2) Boost circuit — boost chopper, the output average voltage U0 is greater than the input voltage Ui, the polarity is the same.
(3) Buck-boost circuit — Buck or Boost chopper, whose output average voltage U0 is greater than or less than the input voltage Ui, polarity is opposite, inductive transmission.
(4) Cuk circuit – buck or boost chopper, the output average voltage U0 is greater than or less than the input voltage Ui, the polarity is opposite, capacitor transmission. There are Sepic and Zeta circuits.
The above is a non-isolated DC-DC converter circuit. The isolated DC-DC converter includes forward circuit, flyback circuit, half-bridge circuit, full-bridge circuit and push-pull circuit.
Today’s soft switching technology has made a qualitative leap in DC/DC. VICOR has designed and manufactured a variety of ECI soft switching DC/DC converters, whose maximum output power is 300W, 600W, 800W, etc. The corresponding power density is (6.2, 10, 17)W/cm3, and the efficiency is (80 ~ 90) %. The RM series of high frequency switching power module, which adopts soft switching technology, launched by TDK-Lambda in Japan, has a switching frequency of (200 ~ 300)kHz and a power density of 27W/cm3. By using synchronous rectifier (MOSFET instead of Schottky diode), the efficiency of the whole circuit is improved to 90%.
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