| 摘要 |
<p>The invention relates to a device for ignition and operation of discharge tubes in an energy saving mode and using a bridge- coupled DC/AC converter. The discharge tube is connected to the AC output of the bridge- coupled device. The essence of the invention lies in that the condenser (7) is coupled parallel with the discharge tube (6) and an inductive coil (5) is coupled in series in a way that they forming together an oscillating circuit. One of the half-bridge is formed by two semiconductor switching elements (1, 2) the control electrodes of which are connected to the outputs (20, 21 ) of a signal generator (10, 21 ) providing alternatively impulses shifted in time to control electrodes. Control impulses exciting a current through the tube (6) in opposite directions, and disconnecting the semiconductor switching elements (1,2) in the intervals between the impulses. The other half-bridge consists of AC coupling elements connected to the other input (9,8) and to the serial coupled circuit comprising the semiconductor switching elements (2, 1) actually switched on, the inductive coil (5) and the fluorescent lamp (6).</p> |
