| 摘要 |
<p>An AC line transient suppressor (1) includes a first metal oxide varistor (5) connected between the «hot» and «neutral» lines (2, 3) of an AC power system. A first inductor (6) is con-. nected from the hot line to one terminal of a second metal oxide varistor (8), the other terminal of which is connected to the neutral line. A second inductor (9) having approximately twice the value of the first one (6) is connected from the junction between the first inductor and the second metal oxide varistor (8) to a hot supply terminal (10) to which equipment to be protected is connected. A silicon surge suppressor (11) having a predetermined clamping voltage is coupled between the hit supply terminal (10) and the neutral line conductor. The inductance of the first inductor has a value selected to divert approximately 95% of the transient surge current through the first metal oxide varistor. The second inductor diverts approximately 65% of the remaining surge current through the second metal oxide varistor, so that only approximately 2% of the total surge current flows through the silicon junction diode suppressor (11), allowing it to provide a low clamping voltage.</p> |
