Current balance power supply circuit of multi-group light-emitting diode

A technology of light-emitting diodes and power supply circuits, which is applied to the layout of electric lamp circuits, semiconductor devices of light-emitting elements, and circuit layout. The effect of low loss and the same luminous brightness
CN101511136AActive Publication Date: 2009-08-19DELTA ELECTRONICS INC
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
DELTA ELECTRONICS INC
Publication Date
2009-08-19

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Abstract

The invention relates to a current balance power supply circuit of a multi-group LBD for driving the multi-group LBD to has same luminosity. The current balance power supply circuit at least contains: a current power supply circuit for receiving the electrical power source and converting into a current with a special current size for providing to the multi-group LBD; a flow equalization circuit connected with the current power supply circuit and multi-group LBD which contains at least a coupling inductor for balancing the multi-group LBD current size; and a current control unit connected withthe current power supply circuit and at least one group LBD of the multi-group LBD for detecting current size of the multi-group LBD and controlling the output current of the current power circuit. The current balance power supply circuit can make each group LBD current balance and has same luminosity, low circuit power consumption, high operating efficiency, less element and low circuit complexity, and save cost greatly.
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Description

technical field

[0001] The invention relates to a power supply circuit, in particular to a current balanced power supply circuit for multiple groups of light emitting diodes. Background technique

[0002] In recent years, due to breakthroughs in light emitting diode (Light Emitting Diode, LED) manufacturing technology, the luminous brightness and luminous efficiency of light emitting diodes have been greatly improved. Therefore, light emitting diodes have gradually replaced traditional lamps and become new lighting components, and are widely used in household lighting, for example. Devices, automotive lighting devices, hand-held lighting devices, LCD panel backlight, traffic signal lights, sign boards and other lighting applications.

[0003] In the application of multiple light-emitting diodes, since the characteristics of each light-emitting diode are different from each other, the magnitude of the current flowing through each light-emitting diode is not the same, which no...

Claims

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