![]() However, this is not critical for most electronics as they handle output quite well. ![]() To distinguish inverters with much less distortion output from modified sinusoidal (three-step) inverter designs, manufacturers often use the term pure sine wave converter.Īlmost all consumer quality converters sold as “pure sine wave converters” do not produce a smooth sine wave output at all, just a less unstable output from the square wave (two steps) and the modified sine wave (three steps). Sine WaveĪ power converter device that produces a multi-step sine waveform is referred to as a sine wave converter. ![]() The square wave output can produce a “buzz” when connected to audio equipment and is generally unsuitable for sensitive electronics. This is one of the simplest waveforms that an inverter design can produce and is best suited for low-sensitivity applications such as lighting and heating. IEEE Standard 519 recommends less than 5% THD for grid-connected systems. Technical standards for commercial power distribution networks require less than 3% THD in the waveform at the customer connection point. One measure of the purity of a sine wave is the total harmonic distortion (THD).Ī quadratic pulse wave of 50% is equivalent to a sine wave of 48% THD. Common types of inverters produce square waves or corrugated squares. Output waveformĪ converter can produce a square wave, a modified sine wave, a pulsed sine wave, a modulated pulse wavelength (PWM), or a sine wave depending on the circuit design. Circuits that perform the opposite function, converting AC to DC, are called rectifiers. Circuits that perform the same function for electronic signals, which usually have very low currents and voltages, are called oscillators. Power converters are mainly used in electrical applications where there are high currents and voltages. Static converters do not use moving parts in the conversion process. The inverter produces no power and the power is supplied from a DC source.Ī power converter can be completely electronic or it can be a combination of mechanical parts (such as a rotary switch) and electronic circuits. The input voltage, the output voltage, the frequency, and the total power handling depend on the design of the particular device or circuit. Inverters do the opposite of “inverters” which were originally large electromechanical devices that convert AC to DC. A power converter, or inverter, is an electronic power device or circuit that converts direct current (DC) to alternating current (AC).The resulting AC frequency depends on the specific device used.
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