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US 10,652,965 B2Granted
Apparatus, dimmable light emitting diode drive circuit and control method
AssigneeSilergy Semiconductor Technology (Hangzhou) LTD
InventorsJianxin Wang, Huiqiang Chen
Life of this patent
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Abstract
An apparatus can include: a light-emitting diode (LED) drive circuit having a silicon-controlled rectifier dimmer; and a bus voltage adjustment circuit configured to adjust a direct current bus voltage to delay a turn-on time instant of the silicon-controlled rectifier dimmer when a conduction angle signal is greater than an angle threshold.
Claims20
An apparatus, comprising:
- a) a light-emitting diode (LED) drive circuit having a silicon-controlled rectifier dimmer;
- b) a rectification circuit coupled to the silicon-controlled rectifier dimmer, wherein the rectification circuit is configured to generate a direct current bus voltage;
- and
- c) a bus voltage adjustment circuit configured to adjust the direct current bus voltage in accordance with conduction angle information of the silicon-controlled rectifier dimmer by increasing the direct current bus voltage to delay a turn-on time instant of the silicon-controlled rectifier dimmer when a conduction angle signal is greater than an angle threshold.
1 more element
A method of controlling a light-emitting diode (LED) drive circuit with a silicon-controlled rectifier dimmer, the method comprising:
- a) acquiring a conduction angle signal for indicating conduction angle information of the silicon-controlled rectifier dimmer;
- b) generating, by a rectification circuit coupled to the silicon-controlled rectifier dimmer, a direct current bus voltage;
- and
- c) adjusting the direct current bus voltage in accordance with the conduction angle information of the silicon-controlled rectifier dimmer by increasing the direct current bus voltage to delay a turn-on time instant of the silicon-controlled rectifier dimmer when the conduction angle signal is greater than an angle threshold.
1 more element
Dependencies are inferred from the claim text.