Patent ID: 11929683
Assignee: DELTA ELECTRONICS, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. An isolated multi-phase DC/DC converter comprising:
a first inverter or rectifier circuit at a primary side of the isolated multi-phase DC/DC converter, the first inverter or rectifier circuit comprising three phases that are each configured to be coupled to a first voltage source;
a second inverter or rectifier circuit at a secondary side of the isolated multi-phase DC/DC converter, the second inverter or rectifier circuit comprising three phases that are each configured to be coupled to a second voltage source;
a multi-phase transformer comprising three primary side windings that are each connected to a respective one of the three phases of the first inverter or rectifier circuit and three secondary side windings that are each connected to a respective one of the three phases of the second inverter or rectifier circuit, each of the three primary side windings being magnetically coupled to a respective one of the three secondary side windings via one or more magnetic cores; and
two blocking capacitors on the primary side of the isolated multi-phase DC/DC converter, each of the two blocking capacitors on the primary side of the isolated multi-phase DC/DC converter being directly connected in series between respective first and second phases of the three phases of the first inverter or rectifier circuit and respective first and second windings of the three primary side windings such that a blocking capacitor is not connected in series between a third phase of the three phases of the first inverter or rectifier circuit and a third winding of the three primary side windings;
wherein each of the two blocking capacitors on the primary side of the isolated multi-phase DC/DC converter blocks DC components of a magnetizing current flowing through the respective first and second windings of the three primary side windings;
wherein the two blocking capacitors on the primary side of the isolated multi-phase DC/DC converter cause an average value of a magnetizing current flowing through the third winding of the three primary side windings to equal a sum of average values of the magnetizing currents flowing through the first and second windings of the three primary side windings over a predetermined period of time, wherein the predetermined period of time corresponds to a resonant frequency of the isolated multi-phase DC/DC converter and wherein the resonant frequency is synchronous with a switching frequency; and
wherein the three primary side windings are connected with each other in a Y-connection configuration or a Δ-connection configuration, and the three secondary side windings are connected with each other in a Y-connection configuration or a Δ-connection configuration to thereby form Y-Y winding pairs, Y-Δ winding pairs, Δ-Y winding pairs, or Δ-Δ winding pairs.