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1 воинское формирование, переданное в оперативное управление
Универсальный русско-английский словарь > воинское формирование, переданное в оперативное управление
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2 кто-то незначительный
Phraseological unit: chopped liver (someone or something insignificant.)Универсальный русско-английский словарь > кто-то незначительный
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3 печень с луком обжаренная на шмальце (еврейское блюдо)
Phraseological unit: chopped liver (A Jewish food made by frying liver and onions in schmaltz.)Универсальный русско-английский словарь > печень с луком обжаренная на шмальце (еврейское блюдо)
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4 прерывистый
1) General subject: broken, discontinuous, discrete, faltering, fitful, intermissive, intermittent, interrupted, pulsed, sporadic (АД), irregular2) Medicine: discontinuous (напр. об электрофорезе), intermittent (напр. о воздействии)4) Bookish: saccadic (о движении)5) Construction: non-continuous6) Mining: jumping7) Cartography: discontinued (характеристика сигналов на морских картах)8) Ecology: disjunctive (об ареале), scattered9) Programming: sampling10) Automation: abrupt, noncontinuous (напр. о поверхности)11) Makarov: broken (о голосе, сне, линии), chopped, rickety, scattered (об ареале), stick-slip12) Phraseological unit: catch-as-catch-can -
5 что-то незначительное
Phraseological unit: chopped liverУниверсальный русско-английский словарь > что-то незначительное
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6 печень с луком обжаренная на шмальце
Phraseological unit: (еврейское блюдо) chopped liver (A Jewish food made by frying liver and onions in schmaltz.)Универсальный русско-английский словарь > печень с луком обжаренная на шмальце
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7 импульсный источник электропитания с коммутацией тока на первичной стороне
импульсный источник электропитания с коммутацией тока на первичной стороне
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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
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