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Power supply device for LED and light emitting device having the same

  • US 9,445,481 B2
  • Filed: 03/15/2013
  • Issued: 09/13/2016
  • Est. Priority Date: 08/29/2012
  • Status: Active Grant
First Claim
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1. A power supply device comprising:

  • a wired controller receiving AC power to generate a driving voltage, and outputting a lighting driving signal;

    a wireless controller wirelessly receiving a lighting control signal and outputting the lighting control signal to the wired controller; and

    a standby power supply unit supplying the AC power to an AC/DC rectifying unit of the wired controller;

    wherein the standby power supply unit receives a reference standby voltage based on the driving voltage from the wired controller, stores the reference standby voltage in a capacitor, and supplies the reference standby voltage to the wireless controller as standby power through a power control unit;

    wherein the standby power supply unit comprises;

    a switching unit supplying the reference standby voltage according to a switching signal that is transmitted from the wireless controller; and

    wherein the capacitor is charged with the reference standby voltage and is discharged by supplying the reference standby voltage to the wireless controller;

    wherein the switching unit comprises a first switch supplying the AC power to the wired controller, and a second switch supplying the reference standby voltage to the capacitor;

    wherein when a lighting unit is turned off and a voltage level of the capacitor is greater than a first reference voltage and the capacitor is fully charged, the first switch and the second switch are turned off;

    wherein when the lighting unit is turned on and the capacitor is in a discharge state, the first switch and the second switch are turned on; and

    wherein when the lighting unit is turned off and the capacitor is not charged and a voltage level of the capacitor is lower than a second reference voltage, the first switch and the second switch are turned on.

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