| 摘要 |
1. Phase-angle control circuit for motors having a commando stage (5) and at least one current transformer (6, 6') of which the rectified secondary voltage serves for the actual value acquisition of the motor current and in addition is used for determining the current crossover, characterized in that a direct voltage which maps the current actual value is gained from the secondary voltage of one or a plurality of current transformers (6, 6') by a rectifier circuit, in which each controlled switch (8, 8') is connected directly and each second controlled switch (9, 9') is connected via an inversion member (10, 10'), and is fed to a comparator circuit (13, 14, 15) which serves for detecting the current crossover. |
