Patent ID: 8188669
Filing Date: 2012-05-29
Classification: F21S,F21W,F21Y,H05B

Abstract:
1. A decorative lamp for displaying alternately snowing or water-flowing pattern, comprising: a rectification power supply, a controller, and a lamp series section connected in sequence, wherein the lamp series section is composed of a plurality of LED strings connected in parallel or in series; the controller comprises an integrated circuit including a plurality of outputs and switch devices for controlling sequentially flashing of the LED strings, each of the switch devices having two terminals electrically connected in series to a loop of the respective LED string, each of the LED strings has respective terminal connected to a common terminal which is a direct current output terminal of the rectification power supply, the other terminal of the LED string is connected to the respective switch device; the integrated circuit has a power supply terminal connected to the direct current output terminal of the rectification power supply, the plurality of outputs of the integrated circuit are connected to control terminals of the switch devices, respectively; wherein the lamp series section is composed of a first LED string, a second LED string and a third LED string, or is composed by parallel connection of a plurality of the first, second and third LED strings; one or more LEDs of the first LED string are connected in series to form a series unit, the adjacent series units have respective terminals connected to the common terminal of the integrated circuit, while the other terminals connected to, from top to bottom sequentially, a first to a fourth outputs of the integrated circuit, respectively; or the two series units at the upper of the four series units of the first LED string having the other terminals connected to, from top to bottom sequentially, the third and the fourth output terminals of the integrated circuit, respectively, while the two series units at the lower of the four series units of the first LED string having the other terminals connected to, from top to bottom sequentially, the first and the second outputs of the integrated circuit, respectively; the second LED string is composed of a upper LED string and a lower LED string, the upper and lower LED strings are respectively composed of four series units from top to bottom sequentially, each of the four series units comprising one or more LEDs connected in series, and the two series units at the same position from the upper and lower LED strings being in series connection; the four series units of the lower LED string have the other terminals jointly connected to the common terminal of the integrated circuit; the two series units at the upper of the four series units of the upper LED string have the other terminals connected to, from top to bottom sequentially, the third and the fourth outputs of the integrated circuit, respectively, while the two series units at the lower of the four series units of the upper LED string have the other terminal connected to, from top to bottom sequentially, the first and the second outputs of the integrated circuit, respectively; or the four series units of the upper LED string have the other terminals connected to, from top to bottom sequentially, the first to the fourth outputs of the integrated circuit, respectively; the third LED string is composed of an upper LED string, an intermediate LED string and a lower LED string, the upper, intermediate and lower LED strings are respectively composed of four series units from top to bottom sequentially, each of the four series units comprising one or more LEDs connected in series, and three series units at the same position from the upper, intermediate and lower LED strings being in series connection; the four series units of the lower LED string have the other terminals jointly connected to the common terminal of the integrated circuit; the four series units of the upper LED string have the other terminals connected to, from top to bottom sequentially, the first to the fourth outputs of the integrated circuit, respectively; or the two series units at the upper of the four series units of the upper LED string have the other terminals connected to, from top to bottom sequentially, the third and the fourth outputs of the integrated circuit, respectively, while the two series units at the lower of the four series units of the upper LED string have the other terminals connected to, from top to bottom sequentially, the first and the second outputs of the integrated circuit, respectively.