Passive current balance driving apparatus

摘要

A passive current balance driving apparatus including first and second drivers is provided. The first driver includes a first balance-capacitor having a first terminal coupled to a first terminal of an AC signal source and a second terminal providing a first balance AC-voltage; and a first rectification unit rectifying the first balance AC-voltage to output a first DC-voltage to drive a first LED string with multi-LEDs connected in series. The second driver includes a second balance-capacitor having a first terminal coupled to a first terminal of the AC signal source and a second terminal providing a second balance AC-voltage; and a second rectification unit rectifying the second balance AC-voltage to output a second DC-voltage to drive a second LED string with multi-LEDs connected in series. The capacitive reactances of these two balance-capacitors are the same and respectively greater than the total internal resistances of the first and second LED strings.