Three-phase multi-level boost PFC rectifier with flying capacitors
AssigneeDelta Electronics, Inc.
InventorsLaszlo Huber, Peter Mantovanelli Barbosa
Life of this patent
Estimating the term…
Abstract
In one embodiment, a method to reduce inductor current ripple in a three-phase, flying capacitor multi-level boost power factor correction rectifier circuit having three totem-pole legs, the method including: determining, for the three-phase, flying capacitor multi-level boost power factor correction rectifier circuit, for which of at least one of a segment in a line cycle or a voltage level of a phase-to-neutral voltage, and for which totem-pole leg selected from any one of the three totem-pole legs, to apply an additional phase shift at one or more instances of time in the line cycle; and applying the additional phase shift in such a way as to center align midpoint voltages of the three totem-pole legs.
Claims18
A method to reduce inductor current ripple in a three-phase, flying capacitor multi-level boost power factor correction rectifier circuit having three totem-pole legs, the method comprising:
- determining, for the three-phase, flying capacitor multi-level boost power factor correction rectifier circuit, for which of at least one of a segment in a line cycle or a voltage level of a phase-to-neutral voltage, and for which totem-pole leg selected from the three totem-pole legs, to apply an additional phase shift at one or more instances of time in the line cycle;
- and
- applying the additional phase shift in such a way as to center align midpoint voltages of the three totem-pole legs,
- wherein the determining is made according to the level of the three-phase, flying capacitor multi-level boost power factor correction rectifier circuit.
A power factor correction rectifier, comprising:
- a three-phase, flying capacitor multi-level boost power factor correction rectifier circuit comprising three totem-pole legs, one of the totem-pole legs comprising switches arranged in pairs with one pair coupled to a flying capacitor;
- and
- a control circuit configured to:
- determine for which of at least one of a segment in a line cycle or a voltage level of a phase-to-neutral voltage, and for which totem-pole leg selected from the three totem-pole legs, to apply an additional phase shift at one or more instances of time in the line cycle;
- and
- apply the additional phase shift in such a way as to center align midpoint voltages of the three totem-pole legs,
- wherein the control circuit is configured to determine according to the level of the three-phase, flying capacitor multi-level boost power factor correction rectifier circuit.
Dependencies are inferred from the claim text.