Patent ID: 9029909
Filing Date: 2015-05-12
Classification: H01L,H02M,H03K

Abstract:
1. A power-packet-switching power converter, comprising: a plurality of phase legs which each include two bidirectional switches which can connect a respective external line to either side of a link inductor which is paralleled by a capacitor, each said bidirectional switch comprising: first and second first-conductivity-type emitter regions on opposing faces of a second-conductivity-type semiconductor mass, first and second second-conductivity-type base contact regions, in proximity to said first and second emitter regions respectively, and oxide-filled trenches between each said first-conductivity-type emitter region and respectively adjacent second-conductivity-type base contact regions; control circuitry which, repeatedly, turns on a selected one or two of said bidirectional switches to drive energy from one or more input lines into said inductor, and then turns off all of said switches to disconnect said inductor, and then turns on a different selected one or two of said bidirectional switches to drive energy from said inductor onto one or two output lines; and a drive circuit which, when the control circuitry selects one of said bidirectional switches for turn-on, drives a base contact region of that switch, to forward bias the associated emitter-base junction and permit majority carriers to flow to the other emitter region on the opposing surface; wherein the drive circuit drives sufficient current through the selected base contact region to generate a total nonequilibrium carrier concentration, in the interior of said semiconductor mass, which is more than thirty times as great as the off-state equilibrium majority carrier concentration, to thereby lower the voltage drop across the switch to less than half a diode drop; wherein, when one said bidirectional switch is conducting in a first direction from one said face, the emitter regions on the opposing face act as collector regions.