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US 9,433,056 B2Granted
Light string having at least one protecting circuit
AssigneeYunmeng Yun Xi Lighting Products Co., Ltd.
InventorFeng Ding
Life of this patent
Estimating the term…
Abstract
The present invention provides a light string including at least one light series branch and a protecting circuit connected between the at least one light series branch and an AC power supply. The protecting circuit includes a switching circuit, a sample circuit and a control circuit for switching off the switching circuit and keeping the switching circuit at off-state when the sampled voltage is larger than or equal to a preset voltage, and controlling the switching circuit to turn on and turn off the at least one light series branch. When the number of the failed lamps and removed lamps reaches to a preset number, the current is opened to protecting the reminder light from been burned out. The light string can light on and off alternately like twinkling stars, or the colors can be changed alternately.
Claims20
A light string, comprising:
- at least one light series branch each comprising a plurality of lights connected in series;
- and
- a protecting circuit connected between the at least one light series branch and an AC power supply, the protecting circuit comprising:
- a diode bridge rectifier configured for converting an AC current from the AC power supply to a DC current;
- a switching circuit with an input terminal connected with a positive output of the diode bridge rectifier, the switching circuit comprising a first switching unit and a second switching unit and having a first output terminal and a second output terminal connected with ends of the at least one light series branch;
- a sample circuit configured for sampling a line current flowing in the at least one light series branch or a current relative to the line current and outputting a sampled voltage;
- and
- a control circuit configured for switching off the first and the second switching units and keeping the first and the second switching units at off-state when the sampled voltage is larger than or equal to a preset voltage, and controlling the first and the second switching units to turn on and turn off the at least one light series branch, such that each light series branch illuminates and goes off alternately like twinkling stars;
- wherein each light is such configured that when a lamp of the light is removed from the light or the lamp is burned out, the remainder lamps in the light string can still illuminate, and a voltage drop across each remainder lamp become higher than before.
6 more elements
A light string, comprising:
- at least one light series branch each comprising a plurality of lights connected in series;
- and
- a protecting circuit connected between the at least one light series branch and an AC power supply, the protecting circuit comprising:
- a diode bridge rectifier configured for converting an AC current from the AC power supply to a DC current;
- a switching circuit with an input terminal connected with a positive output of the diode bridge rectifier, the switching circuit having a first output terminal and a second output terminal connected with ends of the at least one light series branch;
- a sample circuit configured for sampling a line current flowing in the at least one light series branch or a current relative to the line current and outputting a sampled voltage;
- and
- a control circuit configured for controlling the switching unit to turn off the at least one light series branch and keep the at least one light series branch at off-state when the sampled voltage is larger than or equal to a preset voltage, and controlling the switching circuit to turn on and turn off the at least one light series branch, such that each light series branch illuminates and goes off alternately like twinkling stars;
- wherein each light is such configured that when a lamp of the light is removed from the light or the lamp is burned out, the remainder lamps in the light string can still illuminate, and a voltage drop across each remainder lamp become higher than before.
6 more elements
A light string, comprising:
- two light series branches each comprising a plurality of lights connected in series;
- and
- a protecting circuit connected between the two light series branches and an AC power supply, the protecting circuit comprising:
- a switching circuit comprising a first switching unit and a second switching unit and having a first output terminal and a second output terminal connected with ends of the two light series branches;
- a sample circuit configured for sampling a line current flowing in the two light series branches or a current relative to the line current and outputting a sampled voltage;
- and
- a control circuit configured for switching off the first and the second switching units and keeping the first and the second switching units at off-state when the sampled voltage is larger than or equal to a preset voltage, and controlling the first and the second switching units to turn on and turn off the two light series branches, such that each light series branch illuminates and goes off alternately like twinkling stars;
- wherein each light is such configured that when a lamp of the light is removed from the light or the lamp is burned out, the remainder lamps in the light string can still illuminate, and a voltage drop across each remainder lamp become higher than before;
- wherein the first output terminal is connected to a positive end of one of the two light series branches and a negative end of the other of the two light series branches, and the second output terminal is connected to a negative end of the one of the two light series branches and a positive end of the other of the two light series branches;
- wherein one of the two light series branches emits lights with different colors from those emitted by the other of the two light series branches.
7 more elements
Dependencies are inferred from the claim text.