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1 primary frequency
Military: PF -
2 Primary Frequency Macrocontrol
Electrical engineering: PFMУниверсальный русско-английский словарь > Primary Frequency Macrocontrol
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3 primary entry point
High frequency electronics: PEPУниверсальный русско-английский словарь > primary entry point
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4 frequency standard, primary
Engineering: FSPУниверсальный русско-английский словарь > frequency standard, primary
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5 первичная частота
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6 первичная частота
звуковая, низкая частота — audio frequency
Русско-английский военно-политический словарь > первичная частота
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7 первичный эталон частоты
Russian-English dictionary of telecommunications > первичный эталон частоты
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8 первичный эталон частоты
Русско-английский словарь по электронике > первичный эталон частоты
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9 первичный эталон частоты
Русско-английский словарь по радиоэлектронике > первичный эталон частоты
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10 основная частота
1) Engineering: actual frequency, basic frequency, freq fundamental frequency, fundamental2) Railway term: master frequency3) Cinema: primary frequency4) Physics: fundamental frequency5) Electronics: base frequency6) Information technology: reference clock (синхронизации), reference frequency7) Mechanics: dominant mode8) Automation: fixed reference frequency9) Robots: dominant mode (колебаний)10) Aviation medicine: fundamental frequency (голоса)11) Makarov: base frequency (в теории колебаний), basic frequency (в теории колебаний), first frequency, fundamental frequency (в теории колебаний), lowest frequency12) Electrical engineering: elementary frequency -
11 присвоенная частота
1) Engineering: assigned frequency (станции), authorized frequency (станции)2) Electronics: authorized carrier frequency, primary frequency3) Makarov: allocated frequencyУниверсальный русско-английский словарь > присвоенная частота
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12 первичный эталон частоты
1) Engineering: frequency standard, primary2) Telecommunications: primary-frequency standardУниверсальный русско-английский словарь > первичный эталон частоты
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13 доведение до потребителя сигналов эталонных частот
Engineering: dissemination of primary frequency standardУниверсальный русско-английский словарь > доведение до потребителя сигналов эталонных частот
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14 доведение сигналов эталонных частот до потребителя
Engineering: dissemination of primary frequency standardУниверсальный русско-английский словарь > доведение сигналов эталонных частот до потребителя
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15 первичное регулирование частоты
Energy system: primary frequency controlУниверсальный русско-английский словарь > первичное регулирование частоты
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16 передача размера единицы от первичного эталона частоты
Engineering: dissemination of primary frequency standardУниверсальный русско-английский словарь > передача размера единицы от первичного эталона частоты
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17 частота, отведённая первичной службе
Telecommunications: primary frequencyУниверсальный русско-английский словарь > частота, отведённая первичной службе
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18 частота, присвоенная первичной службе
Telecommunications: primary frequencyУниверсальный русско-английский словарь > частота, присвоенная первичной службе
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19 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
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20 основной канал
переключение каналов; коммутация каналов — channel switching
См. также в других словарях:
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