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US 2011/0031899 A1Published application
Dimmable led device with low ripple current and driving circuit thereof
AssigneePhihong Technology Co., Ltd.
InventorsChung-Jen Chu, Yi-Jing Chen, Hung-Chun Chung
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Abstract
A dimmable light emitting diode (LED) device with low ripple current includes a LED module, a phase dimmer, a voltage converting module, a driving module and a feedback module. The flyback converter of the voltage converting module adds a secondary forward winding connecting to a phase cut-off detector to provide a detecting voltage in proportion to current level of the output current across the LED module.
Claims21
A driving circuit for a dimmable light emitting diode (LED) device with low ripple current comprises:
- a phase dimmer and a phase-modulating module for obtaining a phase-modulating AC voltage;
- a voltage-converting module coupled to the phase-modulating module for converting the AC voltage to a first DC voltage;
- a driving module coupled to the voltage-converting module for receiving the first DC voltage and driving the LED module, controlling one of the output current of the LED module based on the phase-modulating information of the phase-modulating module;
- and
- the voltage-converting module includes at least a secondary forward winding providing a detecting voltage as a reference of the output current of the LED module.
2 more elements
A dimmable light emitting diode (LED) device with low ripple current comprises:
- a LED module;
- a phase dimmer and a phase-modulating module for obtaining a phase-modulating AC voltage;
- a voltage-converting module coupled to the phase-modulating module for converting the AC voltage to a first DC voltage;
- a driving module coupled to the voltage-converting module for receiving the first DC voltage and driving the LED module, controlling one of the output current of the LED module based on the phase-modulating information of the phase-modulating module;
- and
- the voltage-converting module includes at least a secondary forward winding providing a detecting voltage as a reference of the output current of the LED module.
3 more elements
Dependencies are inferred from the claim text.