| 摘要 |
<p>Discharge lamps are often connected to the AC network through an inverter and a rectifier, the inverter operating at a frequence of at least 10 kHz. It is possible in this way to maintain the necessary inductance for limiting the low current and at the same time to obtain a high lighting efficiency. However, with this system, the shape of the current extracted from the network differs very much from the sinusoidal shape. In order to avoid this disadvantage the extraction of current has already been controlled by means of a two-state rectifier receiving the half-wave of the network as an order value and the lamp current has an effective value. With this ballast the resulting modulation of the lamp voltage with the network voltage is avoided. </p> |
