-
1 переключение мод
1) Telecommunications: mode switching2) Microelectronics: mode chopping3) Makarov: mode switching (в полупроводниковом лазере) -
2 импульсный источник электропитания с коммутацией тока на первичной стороне
импульсный источник электропитания с коммутацией тока на первичной стороне
-
In primary switch mode power supplies, the AC mains voltage is first rectified and smoothed and then chopped ("switched"). Chopping means that the DC voltage is switched periodically at a frequency of 40 to 200 kHz using a power transistor.
In contrast to linearly regulated power supplies, the power transistor does not act as a variable resistor but as a switch instead. This generates a square-wave AC voltage that is transformed to the secondary circuit using a high-frequency transformer. In the secondary circuit, the voltage is rectifi ed and smoothed. The quantity of energy transformed to the secondary circuit is controlled, depending on the load, by varying the chopping rate. The longer the transistor is conductive, the higher is the quantity of energy transformed to the secondary circuit ( pulse width modulation).
Due to the use of high-frequency AC voltage, primary switch mode power supplies have the decisive advantage that their transformer can be of much smaller size than required for the transformation of low frequencies. This reduces the weight and the dissipation inside the unit. The effi ciency of these units is between 85 and 95 %. Since the output voltage does not directly depend on the input voltage, these units can be used for a wide input voltage range and can even be supplied with DC voltage. Furthermore, it is possible to buffer short-time mains voltage breakdowns up to 200 ms. However, the power failure buffering time is limited by the size of capacitor C1 since a longer buffering time requires a higher capacity and thus a bigger size of the capacitor. Especially in case of small power supplies this is not desirable.
Therefore, a practicable compromise has to be made between the size of the power supply and the buffering time.
Primary switch mode power supplies can be used for all purposes. For example, they are suitable for the supply of all kind of electronics as well as for electromechanical applications.
[ABB]Тематики
EN
Русско-английский словарь нормативно-технической терминологии > импульсный источник электропитания с коммутацией тока на первичной стороне
-
3 импульсный источник электропитания с коммутацией тока на вторичной стороне
импульсный источник электропитания с коммутацией тока на вторичной стороне
-The design of secondary switch mode power supplies differs in only one detail from the design of primary switch mode power supplies. Chopping is performed on the secondary side.
As a result, a much bigger transformer has to be used since it has to transform the mains voltage of 50/60 Hz. However, the transformer also acts as a fi lter and thus minimizes the mains pollution.
[ABB]Тематики
EN
Русско-английский словарь нормативно-технической терминологии > импульсный источник электропитания с коммутацией тока на вторичной стороне
См. также в других словарях:
Timber (arcade game) — Infobox VG title = Timber developer = Marvin Glass and Associates publisher = Bally Midwaycite web|url=http://www.arcade history.com/index.php?page=detail id=2902|title=timber at arcade history: video games, pinballs, slot machines,… … Wikipedia
PRÉHISTORIQUE (ART) — Près de trois millions d’années séparent les premiers outils fabriqués par l’homme des premières images préhistoriques: cette longue période, équivalente de celle qui marqua l’émergence de Homo au sein des Hominidés quelque part en Afrique… … Encyclopédie Universelle
Aristotle: Aesthetics and philosophy of mind — David Gallop AESTHETICS Aesthetics, as that field is now understood, does not form the subjectmatter of any single Aristotelian work. No treatise is devoted to such topics as the essential nature of a work of art, the function of art in general,… … History of philosophy
AMÉRIQUE PRÉCOLOMBIENNE (archéologie et art) - L’Amérique du Sud précéramique — DES ORIGINES AUX PREMIERS VILLAGES Si l’on conserve au mot «préhistoire» son sens le plus courant: «histoire de l’humanité depuis les temps les plus reculés jusqu’à l’apparition des premiers témoignages écrits» (M. Brézillon, 1969), la… … Encyclopédie Universelle
Kamen Rider Den-O (character) — Kamen Rider Den O s first five forms in an eyecatch (from left to right): Rod, Ax, Sword, Gun, and Wing. Kamen Rider Den O (仮面ライダー電王, Kamen Raidā Den ō … Wikipedia
Oscilloscope — This article is about current oscilloscopes, providing general information. For history of oscilloscopes, see Oscilloscope history. For detailed information about various types of oscilloscopes, see Oscilloscope types. Illustration showing the… … Wikipedia
Stone Age — the period in the history of humankind, preceding the Bronze Age and the Iron Age, and marked by the use of stone implements and weapons: subdivided into the Paleolithic, Mesolithic, and Neolithic periods. [1860 65] * * * First known period of… … Universalium
Roland MC-808 — The Roland MC 808 is Roland s latest Groovebox, announced at the Winter NAMM in 2006. It is the successor to the late Roland MC 303, Roland MC 307, Roland MC 505 and Roland MC 909. Though cheaper than the Roland MC 909, it has a number of… … Wikipedia
импульсный источник электропитания с коммутацией тока на первичной стороне — In primary switch mode power supplies, the AC mains voltage is first rectified and smoothed and then chopped ("switched"). Chopping means that the DC voltage is switched periodically at a frequency of 40 to 200 kHz using a power… … Справочник технического переводчика
NASA Infrared Telescope Facility — The NASA Infrared Telescope Facility atop Mauna Kea … Wikipedia
SpongeBob SquarePants (season 7) — SpongeBob SquarePants Season 7 SpongeBob SquarePants, Season 7 Country of origin USA Broadcast … Wikipedia
