| 摘要 |
<p>The circuit comprises a switched dc/dc converter (CC1) of the "fly-back" type, a second switched dc/dc converter (CC2) of the "feed-forward" type, an H-shaped bridge switching circuit (HB) which is connected to the dc/dc converters (CC1, CC2) and in the central branch of which the discharge lamp (L) and associated reactive starter means (TT) are disposed, and a control circuit (ECU) which can drive the dc/dc converters (CC1, CC2) and the bridge switching circuit (HB) in a manner such that, each time the lamp (L) is switched on, a very high voltage is applied initially, in particular, in order to start the lamp, and subsequently a low voltage is applied, but with a high electrical power, in order to support the passage of a large current through the lamp (L) during the heating (warming-up) of the lamp (L) and during the subsequent steady operation of the lamp (L). <IMAGE></p> |
