Light emitting diode (LED) driving device
AssigneeLeadtrend Technology Corp.
InventorsYi-Shan Chu, Hsing-Kuo Chao
Life of this patent
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Abstract
A light emitting diode (LED) driving device includes a power factor correction (PFC) circuit, a bridge switch circuit, a resonant circuit, a transformer and a feedback circuit. The PFC circuit adjusts an output signal thereof based on a feedback signal. The bridge switch circuit transforms the output signal of the PFC circuit into a pulse signal. The resonant circuit resonates and outputs a sinusoidal signal to a primary-side of the transformer based on the pulse signal. The feedback circuit outputs the feedback signal to the PFC circuit in response to a primary-side current of the transformer. Therefore, an output current of the LED driving device is adjusted through modulating the feedback circuit.
Claims14
A light emitting diode (LED) driving device comprising:
- a power factor correction (PFC) circuit, for adjusting an output signal according to a feedback signal;
- a bridge switch circuit, coupled to the PFC circuit, for transforming the output signal from the PFC circuit into a pulse signal;
- a resonant circuit, coupled to the bridge switch circuit, for outputting a sinusoidal signal according to the pulse signal;
- a transformer, a first end of a primary-side of the transformer coupled to the resonant circuit, for receiving the sinusoidal signal;
- and
- a feedback circuit, coupled to a second end of the primary-side of the transformer, for outputting the feedback signal corresponding to a primary-side current of the transformer.
Dependencies are inferred from the claim text.