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US 9,313,841 B2Granted
LED current balance apparatus
AssigneeGreen Solution Technology Co., Ltd.
InventorsChung-Che Yu, Shian-Sung Shiu, Chia-Ming Chan, Li-Min Lee
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Abstract
The present invention provides an LED current balance apparatus, which utilities capacitances coupled to secondary windings of a transformer to store voltage differences between LED strings. Thereby, the driving voltages applied to LED strings are respectively modulated to make the LED strings flowing through a same driving current. A current regulating apparatus is coupled to all LED strings to stabilize total current of the LED strings at a predetermined current.
Claims14
An LED current balance apparatus, comprising:
- a transformer, having a primary winding and a secondary winding, wherein two terminals of the secondary winding are respectively coupled to an LED unit to drive the LED unit lighting;
- two rectifying energy-storage circuits, respectively coupled to corresponding LED units, wherein every rectifying energy-storage circuit comprises a rectifying unit and an energy-storage unit, the rectifying unit is coupled to a corresponding terminal of the secondary winding for rectifying an electric power supplied by the secondary winding, and the energy-storage unit is coupled to the rectifying unit for storing the rectified electric power;
- at least one capacitive unit, coupled to a corresponding terminal of the secondary winding for storing a bias voltage;
- and
- a current regulating apparatus, having a common node coupled to the LED units and stabilizing a sum of currents flowing through the LED units at a predetermined current.
2 more elements
Dependencies are inferred from the claim text.