High Frequency  Electronic Ballast

High frequency  electronic  ballast is  basically switching  power  supply  that  eliminates the ohmic  and iron  of conventional ballast with an integrated high frequency inverter figure  shown a block  diagram of electronic  ballast.

The electronic  ballets  has four  sections.  Since teh current  from the  source has  a very  poor  power  hence  the power  factor  correction is very  necessary.  The first  section  of electronic  ballast  is PF correction  which  gives the  current  with  approximate unity PF. The next  section  is rectifier which  converts the AC  into DC. The DC may  contain  the ripple  hence  the third  section of electronic  ballast is capacitor filer  which  the  ripples and electromagnetic interference signals. The  fourth  section is section  is high  frequency inverter which  converts  the DC voltage  into high  frequency AC voltage.