The invention discloses a three-phase three-level
rectifier based on three-winding isolation transformers, aims to solve the problems of complexity of the structure and control of an existing three-switch Sepic type three-phase three-level
rectifier, and belongs to the field of three-level
rectifier topology. The three-phase three-level rectifier based on the three-winding isolation transformers of the invention is applied to an
aviation power supply and comprises three input filter inductors a, three
energy storage capacitors, three three-winding isolation transformers, three groups of bidirectional switches, six power diodes and two output filter capacitors. According to the three-phase three-level rectifier of the invention, a better
power factor correction
effect function can be realized by means of a
simple circuit structure and control, the output
lower limit of the output
voltage is effectively reduced, and the introduction of the three-winding
isolation transformer effectivelyreduces the
voltage stress of a switching tube in the circuit. When the input current crosses zero, the problem of reverse sudden change of the current does not exist; meanwhile, when the input
voltage crosses zero, the voltages at the two ends of each
energy storage capacitor are negative, and even if the input voltage does not exceed the voltage of the
energy storage capacitors, charging of theinput filter inductors is not affected.