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US 2014/0368129 A1Published application
Led lighting device
AssigneeSharp Kabushiki Kaisha
InventorsShogo Fukuda, Tomoyuki Ichiza, Toshimasa Ogawa
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AssigneeSharp Kabushiki Kaisha
InventorsShogo Fukuda, Tomoyuki Ichiza, Toshimasa Ogawa
Estimating the term…
This LED lighting device makes a maximum current to minimum current flowing in an LED a target proportion regardless of LED driving circuit performance and without erroneous operation. An LED lighting device (1) is provided with: an LED circuit (5) that includes at least one LED (1-5); a bypass means (6a) inserted in parallel with the LEDs (1-5); and an LED driving circuit (4) that supplies current by duty control to the LEDs (1-5) and the bypass means (6a). When a prescribed minimum current flows in the LED circuit (5), the LED driving circuit (4) supplies current in which a portion of current flowing in the bypass means (6a) is added to this minimum current and carries out control of the added current by a switching element (TR1) connected in series to the LED circuit (5) and the bypass means (6a).
1-12. (canceled)
An LED lighting device comprising:
An LED lighting device comprising:
Dependencies are inferred from the claim text.