LCC resonant converter with power factor correction for power supply units

Abstract

This article presents a power supply using an LCC resonant converter having power factor correction with burst mode operation. In order to improve the performance from no load to full load, a microcontroller with an active control has been introduced. The light load efficiency is increased using burst mode operation. The proposed controller provides zero voltage switching. Mathematical analysis is done, and steady state characteristics are drawn. A simple design example is given based on the equations. The proposed converter has good efficiency with good power factor at all loading conditions. This is shown by the simulation and experimental results obtained through testing the prototype.

High Step Up Converter with Transformerless Inverter for Grid Integration

“…( 5) During the operation, the voltage across the primary inductor V L is equal to the input voltage V PV . Therefore, it can be written as (6) The inductor voltage V I can be expressed in terms of transformer turns ratio and V L as below (7) Now, the voltage V B can be written as (8) In order to have discontinuous conduction, using the voltage second balance equation, the inductor voltage V L in the low voltage side to become zero is written as (9) After simplification, the above equation becomes (10) Since the voltage V CL across capacitor C L is equal to negative of the inductor voltage V L in the low voltage side, voltage V CL across capacitor C L can be written as below (11) https://www.indjst.org/ Using Kirchhoff 's voltage law, the voltage V B of the converter can be written as (12) The inductor voltage V I in the secondary to become zero is written as From equations ( 11) -( 13), the voltage gain of the converter is written as Voltage gain (14) In the inverter operation, the voltage variation has to be limited in the specified value. This is done by designing the capacitor.…”