A lamp current balance and feedback system and related method are
disclosed for balancing the input and output currents of a lamp by making
use of a lamp current balance and feedback mechanism. The operation of
the lamp current balance and feedback mechanism includes coupling the
input current of the lamp for generating a first balance current by a
first transformer, coupling the output current of the lamp for generating
a second balance current by a second transformer, coupling the first and
second transformers for substantially equalizing the first and second
balance currents, generating a feedback signal based on the first or
second balance current by a feedback circuit, generating a pulse width
modulation signal based on the feedback signal by a pulse width
modulation signal generation circuit, and driving the input and output
currents of the lamp based on the pulse width modulation signal by a
driving circuit.