公开(公告)号：US20240405768A1

公开(公告)日：2024-12-05

申请号：US18327620

申请日：2023-06-01

Applicant: GAN SYSTEMS INC.

Inventor： Nan XING ,  Robert Wayne MOUNGER ,  Lucas Andrew MILNER ,  Krishnaswamy NAGARAJ ,  Sridhar RAMASWAMY ,  Yinglai XIA ,  Edward MACROBBIE

IPC: H03K17/687

Abstract: A power transistor circuit suppling an internal voltage to an internal voltage supply node. The power transistor circuit includes external terminals, to each of which signals and/or voltages are applied, for each of the input node, output node and control node of the power transistor. The power transistor circuit includes the power transistor, a current draw transistor, a first diode connected between an external control terminal and the internal voltage supply node, and a second diode connected between the current draw transistor output node and the internal voltage supply node. The power transistor circuit includes a charge pump that receives power from the internal voltage supply node and outputs a voltage to the control node of the current draw transistor. In operation, the internal voltage supply node receives power from the external control terminal via the first diode, or an external input terminal via the current draw transistor and the second diode.

公开(公告)号：US20240313651A1

公开(公告)日：2024-09-19

申请号：US18185098

申请日：2023-03-16

Applicant: GAN SYSTEMS INC.

Inventor： Nan XING ,  Yinglai XIA ,  Yalong LI

IPC: H02M3/158 ,  H02M1/00

CPC classification number: H02M3/158 ,  H02M1/0009

Abstract: A power transistor current sense circuit. The control nodes of each of a power transistor and sense transistors are connected. The input nodes of the power transistor and each of the sense transistors are also connected. A voltage divider is connected between a reference voltage source and the output node of a second sense transistor. A negative feedback circuit is connected between the output of the voltage divider and the output node of the first sense transistor. The negative feedback circuit forces a voltage at the output node of the first sense transistor to be approximately equal to the divided voltage. A power transistor current determination component measures a sense current that passes through the first sense transistor, and from that detects the current passing through the power transistor.

公开(公告)号：US20250023464A1

公开(公告)日：2025-01-16

申请号：US18350664

申请日：2023-07-11

Applicant: GAN SYSTEMS INC.

Inventor： Krishnaswamy NAGARAJ ,  Nan XING ,  Sridhar RAMASWAMY ,  Edward MACROBBIE ,  Robert Wayne MOUNGER ,  Lucas Andrew MILNER

IPC: H02M3/07

Abstract: A voltage supply circuit that generates a voltage on a voltage supply node. The voltage supply circuit includes an adjustable capacitor, an alternating voltage source, a charge source, and an adjusting circuit. When the alternating voltage on the second capacitor terminal transitions low, the voltage on the first capacitor terminal also becomes low, and the charge source provides charge to the first capacitor terminal of the adjustable capacitor. When the alternating voltage on the second capacitor terminal transitions high, the voltage on the first capacitor terminal also becomes high, and charge is thereby pumped from the first capacitor terminal to the voltage supply node. The adjusting circuit periodically samples the voltage on the voltage supply node, and adjusts the capacitance of the adjustable capacitor to increase or decrease that voltage.

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.

公开(公告)号：US20240393374A1

公开(公告)日：2024-11-28

申请号：US18322441

申请日：2023-05-23

Applicant: GAN SYSTEMS INC.

Inventor： Lucas Andrew MILNER ,  Marco A. ZUNIGA ,  Nan XING ,  Robert Wayne MOUNGER ,  Edward MACROBBIE ,  Sridhar RAMASWAMY ,  Ahmad MIZANNOJEHDEHI ,  Thomas William MACELWEE

IPC: G01R19/00

Abstract: A current sense circuit that allows for accurate sensing of a power current that flows through a power transistor as the power transistor ages. The circuit includes the power transistor, a sense transistor and a pull-up component. The control nodes of the power transistor and the sense transistor are connected, causing the power transistor and sense transistor to be on or off simultaneously. The pull-up component is connected between the input node of the power transistor and the input node of the sense transistor. When power is provided to the pull-up component, and when each of the power transistor and sense transistor are off, the pull-up component forces a voltage present at the sense transistor input node to be approximately equal to a voltage present at the power transistor input node, causing the sense and power transistors to age together.