Led-based lighting apparatus with low flicker
AssigneeVastView Technology Inc.
InventorsHung-Chi Chu, YuhRen Shen
Life of this patent
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Abstract
An LED-based lighting apparatus is powered by multi-phase AC voltages to reduce flicker. A multi-phase AC-to-AC power generator is used to generate a plurality of AC voltages from an AC power source. The plurality of AC voltages each having a different phase are rectified by a plurality of rectifiers to provide a plurality of rectified AC voltages for a plurality of LED lighting units. Each LED lighting unit has voltage dependent brightness and reaches maximum brightness at different time due to the phase difference in the rectified AC voltage. The peak-to-peak variation in the total brightness is reduced and therefore the LED-based lighting apparatus has low flicker.
Claims21
An LED-based lighting apparatus, comprising:
- a plurality of AC voltages each having a different phase;
- a plurality of rectifiers coupled respectively to said plurality of AC voltages to generate a plurality of rectified AC voltages;
- and
- a plurality of LED lighting units connected respectively to said plurality of rectified AC voltages;
- wherein each of said plurality of LED lighting unit has voltage dependent brightness.
An LED-based lighting apparatus, comprising:
- a plurality of AC voltages each having a different phase;
- and
- a plurality of LED AC driving units connected respectively to said plurality of AC voltages;
- wherein each of said plurality of LED AC driving unit has voltage dependent brightness.
An LED-based lighting apparatus, comprising:
- a plurality of AC voltages each having a different phase;
- a plurality of rectifiers coupled respectively to said plurality of AC voltages to generate a plurality of rectified AC voltages, said plurality of rectified AC voltages being connected in parallel;
- and
- an LED lighting unit connected to said plurality of rectified AC voltages;
- wherein said plurality of LED lighting unit has voltage dependent brightness.
Dependencies are inferred from the claim text.