| 摘要 |
<p>Two LED arrays (211, 215) are connected in parallel and their ends are connected to an alternating power source AC. Each of the LED arrays is formed by a capacitor and three LED blocks (four components in total) connected in series. Furthermore, each of the LED blocks is formed by two LED connected in opposite directions to each other. Between the two LED arrays, connection points of the respective components are connected via a varistor. Even if any one of LED is disconnected or has failed, a current path is formed via the varistor for the LED connected in series to that LED so that other LED are not turned OFF. Moreover, even if the varistor itself is short-circuited and has failed, normal turning ON operation can be maintained if each of the LED is normal.</p> |
