Multi-phase resonant converter with trimmable inductor and phase current balancing method

摘要

A trimmable inductor assembly is provided for optimal balancing of phase currents in a multi-phase resonant converter. A magnetic device includes first and second core portions defining an outer edge of the device having a first axis, and further defining a first air gap. A bracket is positioned proximate the outer edge of the device and a magnetic plate is coupled to the bracket, with the magnetic plate and the second core portion defining a second air gap. A positioning device is coupled to the bracket and is responsive to control signals based on a detected phase current imbalance to drive the bracket and the magnetic plate between a first position defining a minimum air gap for the assembly and a second position defining a maximum air gap for the assembly.

主权项

1. An assembly comprising:
a magnetic device comprising a first core portion having an end with first and second faces and a second core portion having an end with first and second faces, the first faces of the first and second core portions defining a substantially planar outer end of the device having a first axis, the second faces of the first and second core portions defining a first air gap therebetween; a bracket positioned proximate the first face of the first core portion; a magnetic plate coupled to the bracket, the magnetic plate and the second face of the second core portion defining a second air gap therebetween; a positioning device coupled to the bracket and effective to drive the bracket and the magnetic plate along a second axis parallel to the first axis between a first position defining a minimum air gap for the assembly and a second position defining a maximum air gap for the assembly; and the bracket comprising a tab having a tab thickness and extending into the air gap defined by the second faces of the first and second core portions, the tab positioned to engage the second face of the second core portion in the first position wherein the tab thickness defines the minimum air gap for the assembly.