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US 10,536,999 B2Granted
Apparatus, dimmable light emitting diode driver and control method
AssigneeSilergy Semiconductor Technology (Hangzhou) LTD
InventorsHuiqiang Chen, Jianxin Wang
Life of this patent
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Abstract
An apparatus can include: a linear drive circuit configured to control a drive current flowing through an LED load; a control circuit configured to acquire a conduction angle signal of a silicon-controlled rectifier dimmer and control the linear drive circuit; and the control circuit being configured to control the drive current to be decreased to reduce a current ripple and to maintain the silicon-controlled rectifier dimmer in a turn-on state when the conduction angle signal is less than a predetermined value.
Claims24
An apparatus, comprising:
- a) a linear drive circuit comprising a first transistor connected in series with a light emitting diode (LED) load, wherein the linear drive circuit is configured to control the transistor to operate in a linear mode to generate a drive current flowing through the first transistor and the LED load;
- b) a control circuit configured to acquire a conduction angle signal representing conduction angle information of a silicon-controlled rectifier dimmer, and to control the linear drive circuit based on the conduction angle signal;
- and
- c) the control circuit being configured to decrease the drive current through the linear drive circuit to reduce a current ripple flowing through the LED load when the conduction angle signal is less than a predetermined value.
1 more element
Dependencies are inferred from the claim text.