The frequency converter, the control manner, and uses the frequency converter the motor control manner

摘要

The invention relates to a procedure and an apparatus for converting a first alternating voltage into a second alternating voltage with respect to frequency and amplitude by means of a first (1) and a second (2) bridge consisting of switches (T1...T12) and a resonant circuit (3) connected between the bridges. The invention also relates to the use of a frequency converter for the control of a motor. In accordance with conditions determined according to the invention, the main voltages of the supplying network and the main voltages of the load (M) are alternately connected by means of mains bridge switches (T1...T6) and load bridge switches (T7...T12), respectively, across a resonant circuit (3) consisting of a capacitor (CR) and a coil (LR). The duration of each period of connection of the voltage is equal to half the cycle of the characteristic frequency of the resonant circuit formed, and when power is supplied, a bridge change is effected after each period. IMAGE