Main circuit is provided for asynchronous motor power surge FM power, and the inverter transform part of main circuit substantially can be divided into two classes: the voltage type is the dc voltage source inverter, the transformation as dc circuit communicate the filtering is capacitance. Current model is to transform into the dc current source of converter, communicate the dc circuit filter is the inductance. A121P31D9CQ It consists of three components, will work frequency power transformation for dc power “rectifier”, absorb the converter and inverter the resulting voltage ripple “flat wave, and the loop dc power transformation for ac power” inverter “.
Recently the extensive use of the diode’s converter, it is the industrial frequency power transformation for dc power supply. Also used two groups of transistor converter constitute reversible, because A121P31D9CQ its power converter, can undertake renewable direction reversible operation.
Flat wave loop
After rectifying the rectifier of dc voltage, contains six times the power supply voltage ripple frequency, moreover inverter produces the current ripple also make dc voltage fluctuant. In order to restrain voltage fluctuation, using inductance and capacitance absorption voltage ripple (current). Device capacity hours, if the power and main circuit constitute devices have allowance, can save inductance using simple flat to wave circuits.
The high pressure high-power inverter integration transistor technology and electronic control technology, widely used. The role of frequency converter is to change the ac motor power frequency and amplitude are changing its movement, and the magnetic field of the cycle, achieve the purpose of smooth control motor speed. The emergence of frequency converter, make complex speed regulation control simplifies, use frequency converter + ac induction motor is a rat trap type replaced the most original combined with dc motor only completed work, reducing the volume, reduced maintenance rate, the transmission technology development to a new stage. Inverter can optimize motor running, so can also play the role of synergistic energy saving. According to the global famous inverter production enterprise ABB calculate, only the group worldwide production and installation of the inverter has been able to save each year 1150 billion kilowatt-hours of electricity, reduced correspondingly 9,700 tons in carbon dioxide emissions a year, it has already surpassed the Finnish co2 emissions.
Converter Working Principle
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