| 摘要 |
<p>In a circuit (switch means 10) for overvoltage protection of a low voltage device (11) arranged to control a load (12) an energy storage capacitor (17) is connected to charge from supply (+V) whilst the device is controlled from a control circuit (100). During overvoltage, the controller (100) is disconnected by switch means (15) and the capacitor (17) is connected by switch means (16, 18) across the device to maintain it in an on state so that overvoltage device damage is prevented. The circuit is suited to transitory overvoltage conditions such as automotive load dump and to integration with the controlled device.</p> |
