| 摘要 |
<p>The present invention relates to a light dimmer and a method of controlling the operation of same. The light dimmer (1) comprises a switch (2), a control unit (3) and a phase angle regulating unit (4). The energy needed for operating the light dimmer (1) is taken from AC voltage acting over the switch (2). According to the invention, the energy available from the AC voltage acting over the light switch is monitored, and the maximum phase angle of the light dimmer is controlled on the basis of this so that the energy available always exceeds a predetermined minimum. This is accomplished by arranging the phase angle regulating unit (4) to be in connection with a maximum phase angle regulating unit (9), which is connected to a unit (7) for monitoring the voltage over the switch (2). The monitoring unit (7) forms a part of the apparatus and is used for controlling the maximum phase angle.</p> |
