Overvoltage Notching of Electrical Swells

摘要

To protect a connected electrical load from anomalous electricity, an apparatus has a condition sensing unit configured to distinguish a power event type from among power event types from characteristics of an input electricity waveform accepted through an input port. The condition sensing unit indicates the power event type when a corresponding overvoltage criterion is met by characteristics of the input electricity waveform. A power control unit generates, responsive to a power event, a modulation signal that defines at least one amplitude notch in the input electricity waveform in accordance with the power event type. A switching mechanism electrically interposed between the input port and the output port transitions into conducting and non-conducting states in accordance with the modulation signal to superimpose the notch on the input electricity waveform.

主权项

1. An apparatus to protect an electrical load connected to an output port thereof from anomalous electricity accepted through an input port thereof from an electricity supply, the apparatus comprising:
a condition sensing unit configured to distinguish a power event type from among a plurality of power event types from characteristics of an input electricity waveform accepted through the input port, the condition sensing unit indicating the power event type when a corresponding overvoltage criterion is met by the characteristics of the input electricity waveform; a power control unit configured to generate, responsive to a power event, a modulation signal that defines at least one amplitude notch in the input electricity waveform in accordance with the power event type; and a switching mechanism electrically interposed between the input port and the output port and being configured to transition into conducting and non-conducting states in accordance with the modulation signal to superimpose thereby the notch on the input electricity waveform.