Dynamic parameters of active rectifiers

Abstract

The optimum motion trajectory in electric drives of position mechanisms operating under extreme conditions is determined by several separate segments formed from a set of phase trajectories with different target functions. It is shown that the electric drive optimization at one of the segments requires estimating the dynamic parameters of the “braking unit.” Different circuit designs of the “braking unit” of an electric drive are compared. The drawbacks of the most widely used braking circuit with a “drain transistor” (the kinetic energy excess in this circuit is dissipated at the active resistance) are noted. The dynamic parameters of “active rectifiers” operating in the generator mode and traditional circuits with a “drain transistor” are compared using the mathematical modeling methods. The dynamic parameters of “active rectifiers” were assessed quantitatively based on the dependence of the relative overvoltage value in the direct current link on the power returned to the mains.