| 摘要 |
<p>A light source (7), for example a LED source, is supplied from an input power supply (1) through a converter circuit including a primary side(2, 3, 4, 8, 10, 13) and a secondary side (6, 9, 11, 12, 15), separated by a galvanic barrier (5), wherein the primary side includes a power factor control block (2) with an output capacitor (3). On the secondary side there is provided some save circuitry (15) for saving operational data of the converter upon failure of said input power supply (1), and said save circuitry is powered, during saving said operational data, with energy derived form said output capacitor (3) of said power factor control block (2).</p> |
