Ac to dc led illumination devices, systems and method
AssigneeGt Biomescilt Light Limited
InventorTong Fatt Chew
Life of this patent
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Abstract
Illumination devices (10), systems and methods that convert an alternating current (AC) supply (14) to a direct current (DC) for powering a plurality of light emitting diodes (LEDs) are disclosed. An illumination device (10) comprises a full wave rectifier (12) for converting the AC supply into a direct current (DC). A current limiting diode (CLD) module (16), comprising at least one CLD is coupled in series to an output of the full wave rectifier and a light emitting diode (LED) module (18) comprising a plurality of LEDs is coupled in series between an output of the CLD module (16) and the full wave rectifier (12).
Claims30
An illumination device comprising:
- a full wave rectifier for converting an alternating current (AC) supply into a direct current (DC);
- a current limiting diode (CLD) module coupled in series to an output of the full wave rectifier, the CLD module comprising at least one CLD;
- and
- a light emitting diode (LED) module coupled in series between an output of the CLD module and the full wave rectifier, the LED module comprising a plurality of LEDs;
- wherein a pulsed (DC) forward current having a truncated waveform is supplied to the LED module.
A method of powering an illumination device including:
- converting an alternating current (AC) supply into a direct current (DC) with a full wave rectifier;
- and
- passing the DC into a current limiting diode (CLD) module coupled in series to an output of the full wave rectifier, the CLD module comprising at least one CLD;
- and
- supplying a pulsed forward current having a truncated waveform to a light emitting diode (LED) module coupled in series between an output of the CLD module and the full wave rectifier, the LED module comprising a plurality of LEDs.
Dependencies are inferred from the claim text.