Semiconductor Components Industries, LLC

Minha Hwang

Hyunchul Eum

Dhruv Chopra

Gyumin Park

Reducing total harmonic distortion of power-factor correction switching converters. At least one example is a method of operating a power-factor-correction (PFC) converter, the method comprising: charging an inductance of the PFC converter, thereby creating a charge mode; asserting, during the charge mode, an initial-reset signal by a reset circuit implementing voltage-mode control; ending the charge mode a compensated time after assertion of the initial-reset signal, the compensated time inversely proportional to a magnitude of an input voltage of the PFC converter; and then discharging the inductance of the PFC converter.

Method and system of reducing total harmonic distortion of power-factor correction converters

The present disclosure is related to accurate analog dimming of a light emitting diode (LED). Accurate dimming can require precise control of a power converter that supplies the LED with a current. The precise control relies on accurately sensing a level of the LED. When the power converter operates in a discontinuous conduction mode (DCM), for example at a low dimming ratio, the accuracy of the sensed LED-level can be affected by a resonant current offset, resulting from current ringing in the power converter. The disclosed circuits and methods provide accurate control of the LED-level by compensating for the resonant current offset in the sensed LED-level.

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Seoul, South Korea

Minha Hwang