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How much output voltage is required for 1.5 ton AC? 

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A maximum applied voltage of 1.9 kV, which is equivalent to approximately 38 mW of power input, is required for operation, which is significantly lower than the power required for the previously reported devices.
The voltage stress across the switching devices can be so mush reduced at a given ac output voltage.
In this paper, a new family of single stage AC/DC circuits is proposed which shows a high power factor and a tight regulated output voltage.
The experimental results obtained on a 3 kW prototype, built for the input voltage of 250 V and output voltage of 15 kV, confirmed the expected performances.
The experimental results reveal that the optimum small-signal ac voltage should be less than 100 mV.
The test result shows that the energy harvester produces a maximum AC output voltage of 3 V with an optimal resistive load of 200 Ω for 1.5 m/s 2 acceleration at the resonant frequency of 275 Hz.
This paper reaches a conclusion that the number of sub-modules, the voltage modulation ratio, the operation conditions and the control frequency are four key factors that influence the harmonic characteristics of the AC output voltage.
this paper proposes an AC/AC power converter that expands the output voltage range.
However, the choice of the AC voltage level remains critical as it determines the required amount of balancing current, the number of devices and the cell topology, influencing greatly the total efficiency and volume of the obtained DC/DC converter.
The main advantages of the proposed ac-ac converter are the absence of magnetic elements, the stress voltages in all components being equal to half of the high-side voltage, the common reference between input and output voltages, the employment of a single SC leg, the ability to be bidirectional, the high efficiency, and the high power density.
It provides a minimum voltage drop compared to other two AC-DC converter circuits.
This voltage can be used as an input for an inverter to generate an AC voltage.
First of all the voltage should be stepped up to sufficient level at which the DC/AC conversion can be performed to AC mains voltage requirements.
Though the output capacitor voltages of the converters are relatively low compared to those of a conventional inverter, equivalent level of AC output voltages can be obtained.
This is the first step toward establishing an ac voltage standard at the National Institute of Advanced Industrial Science and Technology
Analysis demonstrates that the output voltage capacity and power factor adjustability is limited under unbalanced conditions.
The results illustrate that, at air inlet velocity 0.96 m/s, the maximum percentage of the saved power per ton refrigeration for each kg phase change material with respect to conventional AC unit is about 11.6%, 6.7% and 5.4% for inlet air temperature 45 °C, 40 °C and 35 °C respectively.
Results indicate that only a relatively small DC reactor is required to reduce significantly the voltage distortion, surge current, and AC and DC harmonics.

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