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

Claim 0:
1. 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 a first number of 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 the first number of phases that are each configured to be coupled to a second voltage source;
a multi-phase transformer comprising the first number of primary side windings that are each connected to a respective one of the first number of phases of the first inverter or rectifier circuit and the first number of secondary side windings that are each connected to a respective one of the first number of phases of the second inverter or rectifier circuit, each of the first number of primary side windings being magnetically coupled to a respective one of the first number of secondary side windings via one or more magnetic cores; and
a second number of blocking capacitors on the primary side of the isolated multi-phase DC/DC converter, the second number being one less than the first number, each of the second number of blocking capacitors on the primary side of the isolated multi-phase DC/DC converter being directly connected in series between one of the first number of phases of the first inverter or rectifier circuit and the respective one of the first number of primary side windings such that a blocking capacitor is not connected in series between a remaining one of the first number of phases of the first inverter or rectifier circuit and the respective remaining one of the first number of primary side windings;
wherein the first number is at least three;
wherein each of the second number of 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 one of the first number of primary side windings;
wherein the second number of 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 remaining one of the first number of primary side windings to equal a sum of average values of the magnetizing currents flowing through the others of the first number of 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 first number of primary side windings are connected with each other in a Y-connection configuration or a Δ-connection configuration, and the first number of 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.