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US 11,903,109 B2Granted
Dimming control method, dimming control circuit and power converter thereof
AssigneeSilergy Semiconductor Technology (Hangzhou) LTD
InventorsHongbin Lai, Jianxin Wang
Life of this patent
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Abstract
A method of controlling a power convertor to perform diming control for a light-emitting diode (LED) load, can include: adjusting a length of a switching period of the power converter in accordance with a dimming signal; and controlling the power converter to generate a drive current corresponding to the dimming signal.
Claims20
A method of controlling a power convertor to perform diming control for a light-emitting diode (LED) load, the method comprising:
- a) adjusting a length of a time interval in which an inductor current remains at zero, in order to adjust a length of a switching period of the power converter in accordance with a first adjustment signal that is correlated to a dimming signal;
- b) controlling the power converter to generate a drive current corresponding to the dimming signal;
- and
- c) wherein a duty cycle of the first adjustment signal is greater than a duty cycle of the dimming signal.
1 more element
A dimming control circuit for controlling a power converter to perform diming control for a light-emitting diode (LED) load, wherein:
- a) a length of a time interval in which an inductor current remains at zero is adjusted, in order to adjust a length of a switching period of the power converter in accordance with a first adjustment signal that is correlated to a dimming signal;
- b) the power converter is controlled to generate a drive current corresponding to the dimming signal;
- c) when a set value of the dimming signal is decreased, the length of the switching period is controlled to be increased correspondingly to decrease the drive current;
- and
- d) wherein a duty cycle of the first adjustment signal is greater than a duty cycle of the dimming signal.
2 more elements
Dependencies are inferred from the claim text.