Monday, February 9, 2009

Line Interactive UPS schematics

Schematics of line interactive UPS

Sunday, February 8, 2009

Active Power Factor Correction

Useful links on Active Power Factor Correction
Power Factor Correction Handbook
UC3854 Controlled Power Factor Correction Circuit Design
Optimizing Performance in UC3854 Power Factor Correction Applications
UC3854A and UC3854B Advanced Power Factor Correction Control ICs (Rev. A)
Improved Power MOSFETS Boost Efficiency IN A 3.5kw Single Phase PFC
Optimizing the Design of 3.5kw Single-MOSFET Power Factor Correctors

Solid State Servo Buck

Block Diagram of AC Static PWM Buck Automatic Voltage Regulator

Solid State Servo Boost

Block diagram of Static PWM boost servo stabilizer

Battery Powered CFL Inverter Flyback

Circuit of popular Battery powered CFL inverter using flyback out put stage.
It is the lowest component count and coast but will fail at no load (tube disconnected).

Thursday, February 5, 2009

DC AC CFL Inverter Push Pull

Parallel resonant current fed push pull inverter for battery powered lighting applications. It uses capacitor C3 for preheating and electrostatic shield for tube starting.


DC AC CFL Inverter with preheating

Parallel resonant current fed push pull inverter with preheated staring with out the help of electrostatic shield for battery powered lighting applications.No load protection is also  provided.