Warsaw rectifier

The Warsaw rectifier is a pulse-width modulation (PWM) rectifier invented by Włodzimierz Koczara [pl] in 1992.^[1][2]

Fig. 1: Schematic of Warsaw Rectifier topology

Fig. 2: Patent PL167855 scan

Features

The Warsaw Rectifier provides the following features:

• Unity power factor ^[3]
• Three-wire input, which does not require a 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 to flow through switches
• No cross-short circuiting of switches possible
• Dead time is not required

Topology

The 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 (composed of four diodes and one IGFET circuit) are connected in a delta topology. The rectifier output does not require a divided DC-link circuit as required in the Vienna rectifier topology.^[4][5]

See also

• Vienna rectifier