LED CIRCUIT ARRANGEMENT WITH IMPROVED FLICKER PERFORMANCE
First Claim
1. A circuit arrangement for a light emitting device, comprising:
- a first circuit branch for receiving an AC voltage and comprising a first light emitting diode (LED) circuit serially connected with a first phase-shifting element,a second circuit branch connected in parallel with said first circuit branch, said second circuit branch comprising a second LED circuit serially connected to a second phase-shifting element, in reverse order compared to the LED circuit and phase-shifting element in the first circuit branch, anda third circuit branch comprising a third LED circuit, said third circuit branch having one end connected to a point in said first circuit branch between said first LED circuit and said first phase-shifting element, and a second end connected to a point in said second circuit branch between said second LED circuit and said second phase-shifting element.
3 Assignments
0 Petitions
Accused Products
Abstract
A circuit arrangement (1) for a light emitting device, comprising a first circuit branch (2) for receiving an AC voltage and comprising a first light emitting diode (LED) circuit (3) serially connected with a first phase-shifting element (4), a second circuit branch (12) connected in parallel with the first circuit branch, the second circuit branch comprising a second LED circuit (13) serially connected to a second phase-shifting element (14), in reverse order compared with the LED circuit and phase-shifting element in the first circuit branch, and a third circuit branch (22) comprising a third LED circuit (23) connected between the first and second branches.
With such a circuit design, the current through the first and second LED can be phase shifted compared with the current though the third LED circuit, so that the first and second light emitting diode circuits emit light during one time period, while the third light emitting diode circuit emits light during a second period.
13 Citations
10 Claims
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1. A circuit arrangement for a light emitting device, comprising:
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a first circuit branch for receiving an AC voltage and comprising a first light emitting diode (LED) circuit serially connected with a first phase-shifting element, a second circuit branch connected in parallel with said first circuit branch, said second circuit branch comprising a second LED circuit serially connected to a second phase-shifting element, in reverse order compared to the LED circuit and phase-shifting element in the first circuit branch, and a third circuit branch comprising a third LED circuit, said third circuit branch having one end connected to a point in said first circuit branch between said first LED circuit and said first phase-shifting element, and a second end connected to a point in said second circuit branch between said second LED circuit and said second phase-shifting element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification