FREQUENCY CONVERTER Russian patent published in 1994 - IPC

FIELD: converter technique. SUBSTANCE: device has power rectifier groups on the basis of triacs 1-3, auxiliary triac bridge 5-10 with capacitor 11. The moment of rendering the conducting of triacs is determined by an arrival of pulse from programmable storage device 18 through delay element 19-27. The input of device 18 is connected to the output of counter 16 connected to output of OR gate 3 the input of which is connected to outputs of synchronizers 12-14. The device is characterized in that modes of intermittent current at low rotational speeds at natural switching of the rectifiers are excluded. EFFECT: enhanced reliability. 4 dwg