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US 2018/0027624 A1Published application
Control circuit and method of led lighting apparatus
AssigneeSilicon Works Co., Ltd.
InventorYong Geun KIM
Life of this patent
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Abstract
Disclosed is a control circuit of an LED lighting apparatus, capable of reducing total harmonic distortion (THD). The control circuit may include a THD reduction circuit configured to control a driving current on a current path corresponding to light emission of an LED group in response to a change of a rectified voltage.
Claims11
A control circuit of an LED lighting apparatus which includes one or more LED groups to emit light in response to a change of a rectified voltage, the control circuit comprising:
- a driver configured to provide a current path for a driving current of the one or more LED groups by comparing a sensing voltage to one or more reference voltages corresponding to the one or more LED groups;
- and
- a total harmonic distortion (THD) reduction circuit configured to control the driving current to follow at least part of the change of the rectified voltage, the driving current being outputted from the driver.
A control method of an LED lighting apparatus, comprising:
- sequentially emitting light one or more LED groups in response to a change of a rectified voltage;
- providing, by a driver, a current path by comparing a sensing voltage to one or more reference voltages corresponding to the one or more LED groups in response to a sequential light emitting states of the one or more LED groups;
- primarily controlling, by the driver, a driving current on the current path in response to the change of the rectified voltage while the current path is provided;
- and
- secondarily controlling, by a THD reduction circuit, the driving current outputted from the driver such that the driving current follows at least part of the change of the rectified voltage,
- wherein the driving current is controlled to have a waveform following at least part of the change of the rectified voltage through the primary and secondary controls.
3 more elements
Dependencies are inferred from the claim text.