LIGHT EMITTING DEVICE DRIVER CIRCUIT, CURRENT RIPPLE REJECTER THEREIN, AND CURRENT RIPPLE REJECTION METHOD THEREFOR

摘要

The present invention discloses a light emitting device driver circuit, a current ripple rejecter therein, and a current ripple rejection method therefor. The light emitting device driver circuit includes: a power converter circuit, for converting an input voltage carrying an AC component to an output voltage and supplying an output current; and a current ripple rejecter, which is coupled to the power converter circuit, for filtering a ripple of the output current to generate a light emitting device current, and supplying the light emitting device current to a light emitting device circuit. The current ripple rejecter includes: a low-pass-filter circuit, for filtering the ripple of the output current to generate a filtered current; and a current amplification circuit, which is coupled to the low-pass-filter circuit, for amplifying the filtered current to generate an amplified current; wherein the light emitting device current includes the amplified current.