LED DRIVING CIRCUIT

摘要

In one embodiment an LED driving circuit can include: (i) a rectifier circuit configured to receive an AC input power supply through a TRIAC, and to generate a bus voltage; (ii) a driving current generator configured to convert the bus voltage to a constant driving current and an output voltage to drive an LED load; and (iii) a current distribution circuit coupled between a positive pole and a negative pole of the bus voltage, where the current distribution circuit is configured to sample an input current to generate a sense signal, and to compare the sense signal against a voltage reference signal that represents an expected input current, so as to regulate the input current according to the voltage reference signal.

主权项

1. An LED driving circuit, comprising:
a) a rectifier circuit configured to receive an AC input power supply through a tri-electrode AC switch (TRIAC), and to generate a bus voltage; b) a driving current generator configured to convert said bus voltage to a constant driving current and an output voltage to drive an LED load; and c) a current distribution circuit coupled between a positive pole and a negative pole of said bus voltage, wherein said current distribution circuit is configured to sample an input current to generate a sense signal, and to compare said sense signal against a voltage reference signal that represents an expected input current, so as to regulate said input current according to said voltage reference signal.