Constant current driver circuit for led

A constant current driver circuit for LED (Light-Emitting Diode) is provided. The driver circuit comprises: a BUCK circuit consisting of transformer T1, diode D9, capacitance C5 and field-effect tube Q1; a voltage limiting circuit consisting of resistance R1, diode D8, capacitance C1, resistance R3,...

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Bibliographic Details
Main Authors GAO, YUAN, QIAO, YU-BO
Format Patent
LanguageChinese
English
Published 01.01.2013
Subjects
ADVERTISING
ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION
CRYPTOGRAPHY
DISPLAY
EDUCATION
PHYSICS
SEALS
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Summary:A constant current driver circuit for LED (Light-Emitting Diode) is provided. The driver circuit comprises: a BUCK circuit consisting of transformer T1, diode D9, capacitance C5 and field-effect tube Q1; a voltage limiting circuit consisting of resistance R1, diode D8, capacitance C1, resistance R3, audion Q2, voltage stabilizing diode DZ1 and diode D10; and a current limiting circuit consisting of resistance R4, audion Q3, audion Q4 and resistance R2. The current conducted by field-effect tube Q1 flows through the primary side of transformer T1 and LED load, then flows through field-effect tube Q1 and resistance R2, and then returns to the negative pole of a power. When the field-effect tube Q1 is switched off, the current flows through the primary side of transformer T1, LED load and diode D9 and therefore forms a loop.
Bibliography:Application Number: TW20121117775