| 摘要 |
A control circuit for triacs controlled by constant voltage, together with the controllable resistance of a field effect transistor (7), shifts the load current of a condensor chain (3, 4, 5) in such a way that the current flow angle of the triac (8) can be varied over approximately the whole range of phase angles from 0 to 180 DEG . As the condensors in the chain are used simultaneously to ensure the symmetry of the current flow angle, very few components are required. |
