LED lighting apparatus and control circuit thereof
First Claim
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1. A control circuit of an LED lighting apparatus, which receives a rectified voltage corresponding to an AC voltage passed through a dimmer and controls a plurality of LED groups included in a lamp to emit light in response to the rectified voltage, the control circuit comprising:
- a regulation circuit configured to provide a selective current path to the plurality of LED groups which emit light in response to the rectified voltage; and
a current control circuit configured to sense a current of the current path, control a flow of starting current based on the rectified voltage during a time including a turn-off period of the lamp, and control supply of a holding current to the dimmer.
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Abstract
Disclosed are an LED lighting apparatus and a control circuit thereof which controls the brightness of a lamp including LEDs using a dimmer. The LED lighting apparatus and the control circuit use a starting current based on a rectified voltage, in order to supply a holding current to the dimmer in a state where a lamp including LEDs is turned off.
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Citations
15 Claims
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1. A control circuit of an LED lighting apparatus, which receives a rectified voltage corresponding to an AC voltage passed through a dimmer and controls a plurality of LED groups included in a lamp to emit light in response to the rectified voltage, the control circuit comprising:
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a regulation circuit configured to provide a selective current path to the plurality of LED groups which emit light in response to the rectified voltage; and a current control circuit configured to sense a current of the current path, control a flow of starting current based on the rectified voltage during a time including a turn-off period of the lamp, and control supply of a holding current to the dimmer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A control circuit of an LED lighting apparatus, which receives a rectified voltage corresponding to an AC voltage passed through a dimmer and controls a plurality of LED groups included in a lamp to emit light in response to the rectified voltage, the control circuit comprising:
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a regulation circuit configured to provide a selective current path to the LED groups which emit light in response to the rectified voltage; a first holding current control circuit configured to sense a current of the current path, control a flow of starting current based on the rectified voltage in response to a point of time that the lamp is turned off, and control supply of a holding current to the dimmer; and a second holding current control circuit configured to sense the current of the current path, control the flow of starting current based on the rectified voltage after a first time point before the lamp is turned off and until a second time point after the lamp emits light, and control the supply of the holding current to the dimmer. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An LED lighting apparatus comprising:
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a lamp comprising a plurality of LED groups; a power supply unit comprising a dimmer and configured to convert an AC voltage into a rectified voltage and supply the rectified voltage to the lamp; a control circuit configured to selectively provide a current path corresponding to light emitting states of the respective LED groups, form the current path by comparing a current sensing voltage corresponding to a current light emitting state to reference voltages allocated to the respective LED groups, control a flow of starting current based on the rectified voltage using the current sensing voltage during a time including a turn-off period of the lamp, and control supply of a holding current to the dimmer; and a current sensing element connected to the current path and configured to provide the current sensing voltage. - View Dependent Claims (14, 15)
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Specification