Driving circuit for driving LED load
AssigneeHimax Analogic, Inc.
InventorHang-Yu Fan
Life of this patent
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Abstract
A driving circuit includes a rectifier circuit and a LED driver integrated circuit. The rectifier circuit rectifies an ac power supply into a de power supply. The LED driver integrated circuit includes a regulator circuit, a voltage detector, a buck boost LED driver, and a common ground terminal. The regulator circuit regulates the dc power supply into a regulated voltage. The voltage detector detects whether the regulated voltage meets a voltage requirement and output the regulated voltage when the voltage requirement is met. The buck boost LED driver converts the regulated voltage detected into an output driving voltage according to a remaining voltage at a negative terminal of the LED load to drive the LED load. Voltage potentials at the common ground terminal and at a load ground terminal of the LED load are the same.
Claims14
A driving circuit for driving a LED load, the driving circuit comprising:
- a rectifier circuit for rectifying an AC power supply into a DC power supply;
- and
- a LED driver integrated circuit comprising:
- a regulator circuit for regulating the de power supply into a regulated voltage;
- a voltage detector for detecting whether the regulated voltage meets a voltage requirement and for outputting the regulated voltage when the voltage requirement is met;
- a signal generator, electrically connected to the voltage detector, for generating a pulse width modulation signal;
- and
- a common ground terminal, wherein voltage potentials at the common ground terminal and at a load ground terminal of the LEE) load are the same;
- and
- a buck boost LED driver for converting the regulated voltage detected into an output driving voltage according to a remaining voltage at a negative terminal of the LED load to drive the LED load.
Dependencies are inferred from the claim text.