Warsaw rectifier

The Warsaw rectifier is a pulse-width modulation (PWM) rectifier, invented by Włodzimierz Koczara in 1992.





Features
The Warsaw Rectifier provides following features:
 * Unity power factor
 * Three-wire input, does not require connection to the neutral wire
 * Ohmic behaviour
 * Controlled output voltage
 * Simple control scheme
 * Low power losses

Unique features of the Warsaw Rectifier:
 * Short circuits do not cause current flow through switches
 * No cross short circuit of switches possible
 * Dead time not required

Topology
Warsaw Rectifier is a unidirectional, three-phase, three-switch two-level pulse-width modulation (PWM) rectifier. This topology uses three insulated-gate field effect transistors (IGFET) and eighteen diodes. The bidirectional switches (made as four diodes and one IGFET circuit) are connected in a delta topology. The rectifier output does not require a divided DC-link circuit as in the Vienna Rectifier topology.