ELECTRIC-TRAIN TRACTION INDUCTION DRIVE Russian patent published in 2007 - IPC H02M7/757 

FIELD: electric-train drives using traction induction motors supplied with power from systems incorporating current inverters.

SUBSTANCE: proposed drive is characterized in that its power supply system has single-section input filter incorporating reactor Lf connected to contact system through high-speed switch HS and pneumatic contactor PC-1, as well as resistor R3 connected in parallel with the latter and two series-connected capacitors Cf1 and Cf2; connected in parallel with each of capacitors is thyristor voltage limiter TVL1 and TVL2, respectively; connected in series with each of the latter is braking resistor Rb1 and Rb2, respectively; positive plate of capacitor Cf1 is connected to input of thyristor chopper TC1 and negative plate of capacitor Cf2, to output of thyristor chopper TC2; output of thyristor chopper TC1 and input of thyristor chopper TC2 are connected through respective inverse diodes VD15 and VD25 to midpoint of capacitor bank Cf1-CF2; connected to output of thyristor chopper TC1 through smoothing reactor Lc1 is input of off-line current inverter OLCI1) whose output is connected through pneumatic contactor PC2 and parallel circuit set up of resistor R13m thyristors VS71.2 and VS71.1, resistor R14 to input of similar off-line current inverter OLCI2 made in the form of three circuits whose output is connected through smoothing reactor Lc2 to input of thyristor chopper TC2; output of off-line current inverter OLCI1 is connected to positive plate of capacitor Cf1 through diode VD12; input of off-line current inverter OLCI2 is connected through diode VD22 to negative plate of capacitor Cf2.

EFFECT: improved characteristics of device.

5 cl, 5 dwg, 1 tbl