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1 primary switch mode power supply
- 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
Англо-русский словарь нормативно-технической терминологии > primary switch mode power supply
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2 secondary switch mode power supply
- 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
Англо-русский словарь нормативно-технической терминологии > secondary switch mode power supply
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3 panel
панель; распределительная доска [щит]; приборная доска; консоль ( крыла) ; клин ( полотнища парашютного купола) ; сигнальное полотнище; комиссия, рабочая группаa.c. power panel — щиток управления электросистемой переменного тока
d.c. power panel — щиток управления электросистемой постоянного тока
emergency flotation gear panel — верт. панель аварийных средств обеспечения плавучести
essential services circuit breaker panel — эл. щиток автоматов защиты важнейших потребителей
first officer's instrument panel — приборная доска [панель] второго лётчика [пилота]
hat section stiffened panel — панель, подкрепленная корытообразным профилем
navigation function selector panel — щиток переключения видов [режимов] работы навигационных средств
navigation mode selector panel — щиток переключения видов [режимов] работы навигационных средств
rack cartridge ground test panel — щиток наземной проверки пиропатронов. подвески
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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
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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… … Справочник технического переводчика
