the beginner's guide to frequency inverter
Frequency inverter, in different countries, exists different names, including frequency changer, frequency converter, variable speed drive, variable frequency drive, adjustable speed drive, adjustable frequency drive, ac drive, variable voltage variable frequency drive, vvvf drive, even microdrive.
A frequency inverter is an electronic device, that converts alternating current (AC) of one frequency to alternating current (AC) of another frequency. Frequency inverter may also change the voltage, but if it does, that is incidental to the principal purpose.
The image of frequency inverter from Shenzhen POWTRAN Technology Co., Ltd.
Frequency inverter usually consists of a rectifier stage (producing direct current), which is then inverted to produce alternating current (AC) of the desired frequency. The inverter may use thyristors, IGCTs or IGBTs. If voltage conversion is desired, a transformer will usually be included in either the ac input or output circuitry. The transformer may also provide galvanic isolation between the input and output ac circuits. A battery may also be added to the direct current (EC) circuitry to improve the converter's ride-through of brief outages in the input power.
Frequency inverters vary in power-handling capability, from a few watts to megawatts, widely applied for the motors with different input voltages. For details of frequency inverters with different voltages, you can visit http://www.inverter-china.com/medium-voltage-ac-drive.htm for low voltage frequency inverters or medium voltage ones.
