Importance

Loading Importance Indicators...

Abstract

A method and circuit for correcting a power factor in an alternating current/direct current power transformer. The circuit has an inductance fed by a rectified AC voltage, and a switch by which the inductance can be charged and discharged by closing and opening the switch, and further has a diode by which the discharge current of the inductance is fed to the output of the circuit. During the discharge phase, a voltage V_mon corresponding to the output voltage V_BUS is measured, and the measured values are stored. It is further determined when the discharge current reaches or crosses the zero line at the end of a discharge phase. Switch-on and switch-off signals for actuating the switch are generated by analyzing the information determined. The switch should not be switched on again until a particular minimum switch-off time has been reached.

Loading the Abstract Image...

First Claim