Effi

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

• источники и системы электропитания

EN

• primary switch mode power supply

линейный нерегулируемый источник электропитания
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Рис. ABB

The AC mains voltage (50/60 Hz) applied at the input side is transformed to a lower level and rectifi ed by a subsequent rectifi er. Then, a capacitor C smoothes the output voltage of the rectifi er. The dimension of the transformer depends on the desired output voltage.
Due to the design of the electric circuit, the output voltage directly depends on the input voltage which in turn means that variations of the mains voltage have direct effect to the output side. Since no regulation is done on the secondary side, the residual ripple of the output voltage is in the dimension of volts and specifi ed as a percentage of the DC output voltage.
Due to their simple design, unregulated power supplies are very robust and durable. Their effi ciency is approx. 80 %.
Unregulated power supplies are primarily used for simple electromechanical applications that do not require exact output voltages, e.g. for the supply of contactors.
[ABB]

Тематики

• источники и системы электропитания

Синонимы

• нерегулируемый источник питания

EN

• linearly unregulated power supply
• unregulated power supply

линейный нерегулируемый источник электропитания
-

Рис. ABB

The AC mains voltage (50/60 Hz) applied at the input side is transformed to a lower level and rectifi ed by a subsequent rectifi er. Then, a capacitor C smoothes the output voltage of the rectifi er. The dimension of the transformer depends on the desired output voltage.
Due to the design of the electric circuit, the output voltage directly depends on the input voltage which in turn means that variations of the mains voltage have direct effect to the output side. Since no regulation is done on the secondary side, the residual ripple of the output voltage is in the dimension of volts and specifi ed as a percentage of the DC output voltage.
Due to their simple design, unregulated power supplies are very robust and durable. Their effi ciency is approx. 80 %.
Unregulated power supplies are primarily used for simple electromechanical applications that do not require exact output voltages, e.g. for the supply of contactors.
[ABB]

Тематики

• источники и системы электропитания

Синонимы

• нерегулируемый источник питания

EN

• linearly unregulated power supply
• unregulated power supply

малошумное исполнение
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[Интент]

Параллельные тексты EN-RU

Low Noise Option
This option consists in replacing the standard condenser fans by high effi ciency EC (Electronically Commutated) axial fans.

The noise reduction is achieved by managing the fan rotation speed depending on outdoor temperature, building load and time zone.
[Lennox]

Малошумное исполнение
Данное техническое решение заключается в замене стандартных вентиляторов конденсатора на высокоэффективные осевые вентиляторы EC (с электронно управляемым электродвигателем).

Снижение уровня шума обеспечивается за счет регулирования скорости вращения вентилятора в зависимости от температуры наружного воздуха, тепловой загрузки здания и временного диапазона.

[Перевод Интент]

Тематики

• кондиционирование воздуха в целом

EN

• low noise option