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Solid-state lighting system operated with a high DC voltage

  • US 10,218,218 B2
  • Filed: 06/21/2018
  • Issued: 02/26/2019
  • Est. Priority Date: 06/15/2012
  • Status: Active Grant
First Claim
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1. A light-emitting diode (LED) lighting system, comprising:

  • a luminaire, comprising;

    at least two electrical conductors configured to couple to a line voltage from alternate-current (AC) mains or a direct-current (DC) voltage from a DC power source;

    one or more LED arrays;

    a first full-wave rectifier connected to the at least two electrical conductors and configured to convert the line voltage from the AC mains into a first DC voltage or to receive and to pass the DC voltage from the DC power source;

    an input filter configured to suppress a radio-frequency interference (RFI) noise; and

    a Buck circuit coupled to the first full-wave rectifier via the input filter, the Buck circuit configured to provide a power factor correction and to convert the first DC voltage into a second DC voltage that powers up the one or more LED arrays and to meet LED luminaire efficacy and power factor requirements when the line voltage from the AC mains is available;

    a rechargeable battery;

    a second full-wave rectifier connected to unswitched AC mains and configured to convert a line voltage from the unswitched AC mains into a third DC voltage;

    a first driver comprising an isolated step-down converter, a first ground reference, and a second ground reference electrically isolated from the first ground reference, wherein the first driver is coupled to the second full-wave rectifier and configured to convert the third DC voltage into a fourth DC voltage that charges the rechargeable battery to reach a fifth DC voltage;

    a second driver comprising a step-up converter comprising a first electronic switch, a second electronic switch, and a center-tapped transformer, the second driver configured to receive the fifth DC voltage from the rechargeable battery and to convert the fifth DC voltage into a sixth DC voltage when the line voltage from the unswitched AC mains is unavailable; and

    a voltage sensing and control circuit comprising a first voltage sensing circuit and a relay switch configured to connect either the line voltage from the unswitched AC mains or the sixth DC voltage to the at least two electrical conductors to operate the luminaire, the voltage sensing and control circuit configured to enable the second driver when a rechargeable battery test is performed,wherein;

    the first voltage sensing circuit is configured to detect whether the line voltage from the unswitched AC mains is available and to control the relay switch to couple the sixth DC voltage to the at least two electrical conductors when the line voltage from the unswitched AC mains is unavailable or when the rechargeable battery test is performed, andthe rechargeable battery test is performed to ensure that the rechargeable battery is in a working condition.

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