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Where power inversores dc ac devices substitute for standard line power, a sine wave output is desirable because many electrical products are engineered to work best with a sine wave AC power source.

The standard electric utility provides a sine wave, typically with minor imperfections but sometimes with significant distortion. Sine wave inverters with more than inversores dc ac steps in the wave output are more complex and have significantly higher cost than a modified sine wave, with only three steps, or square wave one step types of the same power handling.

AC motors directly operated on non-sinusoidal power may produce extra heat, may have different speed-torque characteristics, or may produce more audible noise than when running on sinusoidal power. Modified sine wave[ inversores dc ac ] The modified sine wave output of such an inverter is the sum of two square waves one of which is phase shifted 90 degrees relative to the other.

The result is three level waveform with equal intervals of zero volts; peak positive volts; zero volts; peak negative volts and then zero volts.


This sequence is repeated. The resultant wave very roughly resembles the shape of a inversores dc ac wave. Most inexpensive consumer power inverters produce a modified sine wave rather than a pure sine wave.


The waveform in commercially available modified-sine-wave inverters inversores dc ac a square wave but with a pause during the polarity reversal.

Generally, the peak voltage to RMS voltage ratio does not maintain the same relationship as for a sine wave.


The DC bus voltage may be actively inversores dc ac, or the "on" and "off" times inversores dc ac be modified to maintain the same RMS value output up to the DC bus voltage to compensate for DC bus voltage variations.

The ratio of on to off time can be adjusted to vary the RMS voltage while maintaining a constant frequency with a technique called pulse width modulation PWM. The generated gate pulses are given to each switch in accordance with the developed pattern to obtain the desired output.

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Harmonic spectrum in the output depends on the width of the pulses and the modulation frequency. When operating induction motors, voltage harmonics are usually not of concern; however, harmonic distortion in the current waveform introduces additional heating and can produce pulsating torques.

Items with a switch-mode power supply operate almost entirely without problems, but if the item has a mains transformer, this can overheat depending on how marginally it is rated. However, the load may operate inversores dc ac efficiently owing to the harmonics associated with a modified sine wave and produce a humming inversores dc ac during operation.

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This also affects the efficiency of the system as a whole, since the manufacturer's nominal inversores dc ac efficiency does not account for harmonics. Therefore, pure sine wave inverters may provide significantly higher efficiency than modified sine wave inverters.


However, they may be quite noisy. A series LC filter tuned to the fundamental frequency may help.

Inversor dc ac

This signal then goes through step-up inversores dc ac generally many smaller transformers are placed in parallel to reduce the overall size of the inverter to produce a higher voltage signal. The output of the step-up transformers then gets filtered by capacitors to produce a high voltage DC supply.

Output frequency[ edit ] The AC output frequency of a power inverter device is usually the same as standard power line frequency, 50 or 60 inversores dc ac If the output of the device or circuit is to be further conditioned for example stepped up then the frequency may be much higher for good transformer efficiency.

Output voltage[ edit ] The AC output voltage of a power inverter is often regulated to be the same as the grid line voltage, inversores dc ac or VAC at the distribution level, even when there are changes in the load that the inverter is driving.

Inversor DC-AC

This allows the inverter to power numerous devices designed for standard line power. Some inversores dc ac also allow selectable or continuously variable output voltages.

Output power[ edit ] A power inverter will often have an overall power rating expressed in watts or kilowatts.

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