Patent ID: 9467079
Filing Date: 2016-10-11
CPC Classification: H02P

Claim Text:
1. A power supply system for a direct-current drive, comprising: a power converter for at least one direction-dependent two-quadrant operating mode; at least one associated pulse-based actuation device; an input-side connection and an output-side connection for the power converter; at least one mechanical interruption device for at least one of the input-side connection and the output-side connection; a first measuring device for detecting a respective first characteristic variable for the current flowing on the output side is provided on the output side, and a second measuring device on the input side for determining a respective second characteristic variable for the current flowing on the output side based on the measured values of said second measuring device, wherein the power supply system is provided to continually provide values of a current flowing on the output side during operation, and the power supply system is configured to: receive a safe torque off (STO) signal, after receiving the safe torque off signal, immediately adjust the output voltage of the power converter such that the current flowing on the output side is brought down to zero or at least below a safety-critical limit value close to zero already within a first time interval, once the first time interval, which begins when the STO signal is received, has elapsed, at least one of interrupting the output of pulses to the power converter and interrupting the output of a current-direction signal to the power converter, with the result that a feed of actuation power through the actuation device into the power converter is interrupted, and supply an interruption signal to the at least one mechanical interruption device once a second subsequent time interval has elapsed and the current flowing on the output side has not decayed below a safety-critical limit value, wherein a logic AND operation of a respective undershoot of the first and the second characteristic variables is used as criterion for a decay of the current flowing on the output side below the safety-critical limit value.