| 摘要 |
FIELD: electricity. ^ SUBSTANCE: invention relates to electrical engineering and can be used in AC electric stock. In each half-cycle the first (7) or second (8) diodes change into conducting condition, at the same time the second (10) or the first (9) thyristor also changes to conductive condition, since control unit (6) sends control pulse to electrode of thyristor control. As voltage passes over "zero", voltage detector (5) generates a signal, which causes zeroing of the first timer included into control unit (6) and registers constant into the second timer of control unit (6). As current passes over "zero", current detector (4) generates signal, which causes fixation of content in the first timer of control unit (6), at the same time number recorded in this timer is proportional to clock frequency of control unit (6) and angle of current phase shift. The second timer of control unit (6), where constant is recorded in the beginning of half-cycle, continues counting for subtraction until its content becomes equal to content in the first timer of control unit (6). If values of the first and second timer are equal, control unit (6) generates control pulse to disconnect the first (9) or second (100) thyristor. ^ EFFECT: improved power ratio in the whole range of control and reliability. ^ 1 dwg |
