Single-stage digital power converter for driving LEDs
First Claim
1. A power converter for driving at least one light-emitting diode (LED), the power converter comprising a single stage operable to provide both power factor correction (PFC) for input power and control of current delivered to the at least one LED, the single stage having no more than one inductor for power conversion, wherein the single stage comprises a sine table module for reducing total-harmonic-distortion (THD).
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Abstract
This invention presents a single-stage power converter for driving many number of Light-Emitting-Diode (LED). The power converter converts an AC input voltage into DC current source and regulates the current flowing into the LED. In addition, the AC input current is controlled to have a sinusoidal waveform synchronized with the AC input voltage so that AC input Power Factor is corrected. Hence, both of Power Factor Correction (PFC) and LED current regulation are obtained simultaneously by using a single power conversion stage. So higher efficiency with low cost can be obtained.
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Citations
16 Claims
- 1. A power converter for driving at least one light-emitting diode (LED), the power converter comprising a single stage operable to provide both power factor correction (PFC) for input power and control of current delivered to the at least one LED, the single stage having no more than one inductor for power conversion, wherein the single stage comprises a sine table module for reducing total-harmonic-distortion (THD).
- 8. A power converter for driving at least one light-emitting diode (LED), the power converter comprising a single stage operable to provide both power factor correction (PFC) for input power and control of current delivered to the at least one LED, the single stage having no more than one inductor for power conversion, wherein the single stage comprises means for identifying a synchronization condition for the input power, wherein the input power has an AC voltage component, and wherein the means for identifying a synchronization condition is operable to identify at least one instance of the AC voltage component crossing a zero point.
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11. A single-stage power converter for driving at least one light-emitting diode (LED) using an input power, the converter comprising:
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means for providing power factor correction (PFC) for the input power; and means for controlling current delivered to the at least one LED; wherein the means for providing PFC and the means for controlling current collectively have no more than one inductor wherein the means for providing PFC comprises; a resistor and a diode for identifying a synchronization condition for the input power; and a sine table module for synchronizing a current component and a voltage component of the input power. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification