Patent ID: 11909384
Assignee: GAN SYSTEMS INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. A power semiconductor switching device comprising:
a high-side switch and a low-side switch connected in series in a half-bridge configuration, between a high voltage DC bus and a low voltage DC bus, the high side switch being connected to the low side switch at a switching node, wherein
the high-side switch is a normally-off switch wherein a first normally-on GaN transistor switch (Q1) is connected in series with a normally-off Si MOSFET switch (M1), the source of Q1 being connected to the drain of M1;
the low side switch is a normally-on switch, comprising a second normally-on GaN transitory switch (Q2); and
Q1 has a source, a drain and a gate, wherein the drain of Q1 is connected to the high voltage DC bus and the source of Q1 is connected to a drain of M1, and the gate of Q1 is connected to a first gate drive terminal for directly driving the gate of Q1; the source of M1 is connected to the switching node, a gate of M1 is connected to an enable (control) terminal for directly driving the gate of the M1; a high-side ground terminal is connected to the source of M1; and a voltage sense terminal is connected to a common point between the source of Q1 and the drain of M1; and
Q2 has a source, a drain and a gate, the drain of Q2 is connected to the switching node and the source of Q2 is connected to the low voltage DC bus, and the gate of Q2 is connected to a second gate drive terminal for directly driving the gate of Q2; and a low-side ground terminal is connected to the source of Q2.