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Portable power supply with safety switch

  • US 20050122650A1
  • Filed: 12/03/2003
  • Published: 06/09/2005
  • Est. Priority Date: 12/03/2003
  • Status: Abandoned Application
First Claim
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1. A portable electric power supply comprising:

  • a power input having first and second power conductors and a neutral conductor;

    one or more outlets;

    a main power contactor adapted to electrically connect the one or more power outlets to the neutral conductor and one or more of the first and second power conductors when the main power contactor is activated;

    a manually-operated safety switch providing a closed circuit when manually activated and an open circuit when not manually activated;

    a latching contactor providing a closed circuit when activated and an open circuit when not activated, the latching contactor being connected to provide a parallel electrical circuit with the safety switch;

    a voltage sensing relay contactor providing a closed circuit when activated and an open circuit when not activated;

    a voltage sensing relay adapted to measure a first voltage in the first power conductor and a second voltage in the second power conductor and to activate the voltage sensing relay contactor when the first and second voltages exceed a predetermined turn-on value and deactivate the voltage sensing relay contactor when one or both of the first and second voltages falls below a predetermined turn-off value; and

    a main contactor relay, connected in electrical series with the safety switch and the voltage sensing relay contactor between the neutral conductor and at least one of the first and second power conductors, the main contactor relay being adapted to activate the main power contactor and latching contactor when the voltage sensing relay contactor and one or both of the safety switch and latching contactor are activated, and to deactivate the main power contactor and latching contactor when the voltage sensing relay contactor is deactivated.

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