Special inverter suppliers remind you that in daily industrial production, there are inverters that do not require rectifier units, which are the so-called alternating current inverters. However, the vast majority of the market is AC-DC-AC frequency converter, which also contains a rectifier unit, which is a format formed by technology and market competition to a certain extent, and the AC-DC frequency converter is less expensive to produce and more reliable and sophisticated to use, so we all use it. In practice, this is also in line with some of the rules of human scientific research.
For example, our sounds are now digitized, turned into abbreviated 0-1 codes, and then transmitted to distant places, and then turned into real sounds. Because the abbreviated things are simple to quantify and process, we will linearize the messy curves, and then use the linearized things to approximate the cluttered practical links.
AC-DC-AC inverter, is the first communication electricity into DC, and then through the IGBT chopping method inverted into communication, chopping time division processing input DC is relatively simple, because it is linear, from the calculus point of view, as long as the dividend is small enough for many squares, the cumulative effect effect is the same as the sine wave, and IGBT these devices, itself can only be turned on and off, so it is more appropriate to process the signal of the square.
Therefore, the communication has been changed to DC first, and it seems that there is an additional process, and in practice, "sharpening the knife without cutting wood", it is much simpler horizontally and vertically. Other rectifier modules and capacitors are classified as more traditional and sophisticated electronic devices, and the price is relatively cheap, but the volume is a little larger.
AC-DC inverter is relatively common and consists of three parts: rectifier, filter system and inverter. The rectifier is a diode three-phase bridge uncontrolled rectifier or a full-control rectifier composed of high-power transistors, and the inverter is a three-phase bridge circuit composed of high-power transistors.
The central filter link is to filter the voltage or current after rectification with a capacitor or reactor, and the AC-DC inverter can be divided into two types: voltage type and current type according to the different central DC filtering links, because of various factors such as control methods and hardware design, voltage inverter is widely used, and it is used in the field of industrial automation inverter (using variable voltage and frequency conversion VVVF control, etc.) and IT, power supply in the field of uninterruptible power supply (that is, UPS, using constant voltage and constant frequency CVCF control).
Of course, this is not to say that AC inverters are not developed. The matrix inverter is a new type of alternating direct inverter, consisting of nine switching arrays that are directly connected between the three-phase input and output. The matrix converter does not have a central DC link, and the output is composed of three levels, and the harmonic content is relatively small; Its power circuit is simple and compact, and can output a sinusoidal load voltage with controllable frequency, amplitude and phase; Matrix converters have a controllable input power factor and can operate in four quadrants, although matrix converters have many advantages.
However, in the process of commutation, it is not allowed to have two switches on or off at the same time, which is more difficult to achieve. The highest output voltage capability of matrix converters is low, and the high acceptance voltage of the device is also a big disadvantage of this type of converter. In addition, although it does not need a rectifier unit, it has 6 more switching devices than AC-DC inverters. |
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Typical wiring method for the main circuit of a Reynolds frequency converter
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RN: on behalf of Reynolds;
B: low-voltage frequency conversion governor;
2: 2000 series;
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Reynolds inverter code function description
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CNC cutting machine
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