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21 особые замечания по эксплуатации изделия и аварийным случаям
Особые замечания по эксплуатации изделия и аварийным случаям - special notes on regular operation and breakdownsРусско-английский научно-технический словарь переводчика > особые замечания по эксплуатации изделия и аварийным случаям
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22 обслуживание
обслуживание, 1. комплекс работ — service▪ Inspection service, maintenance service, calibration service, lubrication service. Service: To perform a service of maintenance, supply, repair, installation, distribution, etc., for or upon; as to service a car, a radio, a ship, a territoryобслуживание, 2. подготовка к работе (заправка, смазка), уход — servicing (before-operation, during-operation, at-halt, after-operation servicing)▪ Servicing is work on motor vehicles consisting of cleaning, lubricating, replenishment of fuel, lubricant, cooling agent and air for tires to ensure proper operation. Servicing: To make fit for service, as by adjusting, repairing, etc.обслуживание, 3. техобслуживание (поддержание в исправном состоянии) — maintenance▪ The term "maintenance" refers to all actions which a person performs on an actual piece of equipment or machinery to retain the equipment in a serviceable condition or to restore it to serviceability. This involves inspection, servicing, repair, rebuilding, etc.▪ Organizational maintenance is performed by the using organization on its assigned equipment. It consists of inspecting, cleaning, servicing, preserving, lubricating, adjusting and replacing such minor parts as spark plugs or radio tubes.обслуживание профилактическое — preventive maintenance, scheduled maintenance▪ Preventive or scheduled maintenance is defined as those measure taken periodically to achieve maximum efficiency in performance, to ensure continuity of service, to reduce major breakdowns, and to lengthen the useful life of the equipment or system. This form consists mainly of cleaning, lubricating and periodic tests aimed at discovering conditions, if not corrected, may lead to malfunctions.▪ Scheduled maintenance: Periodic inspection, and/or servicing of equipment accomplished on a calendar, mileage or hours of operation basis.обслуживание текущее, уход — routine servicingобслуживание текущее, профилактическое техническое обслуживание [регламентные работы] — routine maintenanceобслуживание техническое N 1 [ТО1] — maintenance service No. 1 [MS 1]обслуживание техническое N 2 [ТО2] — maintenance service No. 2 [MS 2]проводить техническое обслуживание — to undertake maintenance, to perform maintenance, to carry out maintenance, to service▪ In the field, maintenance must be undertaken under most difficult conditions. When servicing the receiver, avoid contact with the power supply and anode circuits.Поставки машин и оборудования. Русско-английский словарь > обслуживание
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23 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.
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Русско-английский словарь нормативно-технической терминологии > импульсный источник электропитания с коммутацией тока на первичной стороне
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