公开(公告)号：US20240364201A1

公开(公告)日：2024-10-31

申请号：US18309651

申请日：2023-04-28

Applicant: GAN SYSTEMS INC.

Inventor： Yalong LI ,  Yinglai XIA ,  Robert Wayne Mounger ,  Nan XING ,  Edward MacRobbie ,  Zhemin ZHANG

IPC: H02M1/00 ,  H02M1/08 ,  H02M3/156

CPC classification number: H02M1/0009 ,  H02M1/08 ,  H02M3/156

Abstract: A circuit that includes a power transistor and at least one sense transistor and that uses the control drive terminal to not only control the power transistor and the sense transistor, but also to provide power to a current sense circuit. The control nodes of the power transistor and sense transistor are connected, and the input nodes of the power transistor and the sense transistor are also connected. The current sense circuit is connected to the sense transistor control node and is configured to detect current passing through the sense transistor. The current sense circuit is also connected to the control drive terminal and is configured to draw power from the control drive terminal when a high control signal is present on the control drive terminal. Accordingly, the current sense circuit does not require an independent fixed high voltage supply in order to operate.

公开(公告)号：US20240283441A1

公开(公告)日：2024-08-22

申请号：US18172922

申请日：2023-02-22

Applicant: GAN SYSTEMS INC.

Inventor： Nan XING ,  Yinglai XIA ,  Yalong LI ,  Zhemin ZHANG

IPC: H03K17/082 ,  H03K5/24

CPC classification number: H03K17/0822 ,  H03K5/24

Abstract: Desaturation protection for a power field-effect transistor. The desaturation protection circuit includes the power field-effect transistor and a sense field-effect transistor that each have threshold voltages that are approximately the same. The sense field-effect transistor shares a gate terminal with the power field-effect transistor and shares a drain terminal with the power field-effect transistor. The circuit also includes a comparator having a first input terminal connected to a source terminal of the sense field-effect transistor, and having a second input terminal connected to a voltage source that is an offset voltage below a supply voltage. The circuit also includes a pull-up network configured to cause the output of the comparator to represent a state of whether the sense field-effect transistor is on or off, and can directly drive the turning off of the power transistor.