DC analysis of converters using rectifier control cell

This paper identifies a combination of a capacitor, a current source, and a diode (CID) in the charge-pump power factor correction circuit (CPPFC) as a three-terminal device or control cell performing a converter control function similar to that of the conventional switching-cell in PWM and quasi-resonant (QR) converters. As the three-terminal device and a, switching-cell are similar, all the analytical techniques established for PWM and QR converters can be applied seamlessly to this new class of control cell and converter. A dc model of the control cell is derived using circuit-averaging technique. Even if the control device is presented as three-terminal device, its model reveals that the control cell is inherently a two-terminal half wave rectifier. A dimensionless current-voltage characteristic of the control cell is calculated and verified experimentally. By applying permutation technique to the control cell, many variations of this new type of converter can be generated. Conversion ratios of the basic converter topologies are calculated and confirmed by simulations as well as experimental data. The output voltage of a converter using this type of control cell is load sensitive similar to that of a PWM converter operating in the discontinuous conduction mode.