Method and apparatus for cancelling output current ripples in led driving circuits
AssigneeHuizhou Light Engine Ltd.
InventorsKam Wah Siu, Wa Hing Leung, Siu Hong Wong, Bo Tian
Life of this patent
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Abstract
A device and method for reducing current ripple to a light emitting diode array having a single stage power factor correction driver with an output voltage ripple that is reduced by using a linear current regulator connected in series between the single stage power factor correction driver and the light emitting diode array, which actively adjusts an equivalent impedance of the linear current regulator in correspondence with the output voltage ripple of the single stage power factor correction driver.
Claims14
A lighting array comprising:
- a single stage power factor correction driver for converting an AC supply voltage to DC and providing a power correction factor, with an output of the single stage power factor correction driver having an output voltage ripple;
- a light emitting diode array;
- and
- a linear current regulator connected in series between the single stage power factor correction driver and the light emitting diode array to actively adjust an equivalent impedance of the linear current regulator in correspondence with the output voltage ripple of the single stage power factor correction driver.
A method of reducing output current ripple to a light emitting diode comprising:
- converting an AC supply voltage to DC and providing a power correction, factor through a single stage power factor correction driver, with an output of the single stage power factor correction driver having an output voltage ripple;
- and
- adjusting an equivalent impedance of the linear current regulator in correspondence with the output voltage ripple of the single stage power factor correction driver through a linear current regulator connected in series between the single stage power factor correction driver and a light emitting diode array.
Dependencies are inferred from the claim text.