Abstract
In this paper, one AC light-emitting diode (LED) driver with high power factor (PF) and low
total harmonic distortion (THD) is adopted, which is added with the proposed switched LED module
and is controlled based on the field-programmable gate array (FPGA). By doing so, the efficiency
of such an AC LED driver can be improved significantly. This switched LED module is constructed by
several LED strings, which have individual series-connected MOSFET switches. As the switch of the
switched LED module is turned on, the corresponding LED string is short-circuited and hence is not
conducted, whereas as the switch of the switched LED module is turned off, the corresponding LED
string is conducted due to the redundant input voltage across this LED string. Therefore, the
redundant input voltage across between the collector and emitter of the BJT current source can be
reduced, that is, the unwanted power dissipation in the BJT current source can be decreased, so as
to upgrade the efficiency of the overall system.
© 2013 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription