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System for providing auxiliary power to lighting unit for heavy equipment having a direct current power supply and no uninterruptible power supply

  • US 6,388,392 B1
  • Filed: 03/23/1999
  • Issued: 05/14/2002
  • Est. Priority Date: 03/23/1999
  • Status: Expired due to Fees
First Claim
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1. A lighting system for machinery powered via a direct current power bus connected to a direct current power supply, the direct current power bus providing a predetermined steady-state potential, the machinery being provided with a discharge lamp and ballast connected to the direct current power bus, said lighting system comprising an energy storage bank connected in parallel with respect to said direct current power supply and said ballast, said energy storage bank comprising at least one capacitor and operable to maintain a voltage across said ballast corresponding approximately to said steady-state potential of said direct current power bus, and to discharge and at least momentarily sustain a voltage across said ballast when power from said direct current power bus to said ballast decreases below a selected voltage, said energy storage bank operating passively.

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