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公开(公告)号：US20180041130A1
公开(公告)日：2018-02-08
申请号：US15669345
申请日：2017-08-04
CPC分类号： H02M3/33507 , H02M1/32 , H02M3/33523
摘要： Methods and systems for providing electrical power using an isolated DC-DC converter, including the actions of: a) providing current to a primary side of a transformer at multiple predetermined open loop current levels using a power supply, said power supply providing said open loop current levels in increasing amplitude order and at predetermined times, said open loop current levels and times being selected to ramp a voltage across output terminals connected to a secondary side of said transformer so that after said power supply provides a maximum one of said open loop current levels, said voltage reaches a threshold sufficient to enable a closed loop controller connected to said output terminals to send a feedback signal to said primary side, said threshold being insufficient to fully power said output terminals; and b) sending said feedback signal to said primary side using said closed loop controller when said voltage reaches said threshold, said power supply controlled in response to said feedback signal to continue providing current to said primary side at closed loop current levels, said feedback signal selected to control said power supply to increase said closed loop current levels until said output terminals are fully powered.
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公开(公告)号：US20240235504A9
公开(公告)日：2024-07-11
申请号：US17972518
申请日：2022-10-24
发明人： Harsh Sheokand , Tarunvir Singh , Anant Kamath , Suvadip Banerjee
IPC分类号： H03F3/45
CPC分类号： H03F3/45654 , H03F3/45183 , H03F2203/45526
摘要： A system includes an operational amplifier which includes a first amplifier input, a second amplifier input and an amplifier output. The system includes a first switch which includes a first terminal and includes a second terminal coupled to the first amplifier input. The system includes a second switch which includes a first terminal coupled to the first amplifier input and a second terminal coupled to the second amplifier input. The system includes a first bias current source coupled between the first amplifier input and a common potential and includes a second bias current source coupled between the first terminal of the first switch and the common potential. The system includes a feedback path between the amplifier output and the first amplifier input.
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公开(公告)号：US20240235422A1
公开(公告)日：2024-07-11
申请号：US18153249
申请日：2023-01-11
发明人： Anant Kamath , Suvadip Banerjee
CPC分类号： H02M7/538 , B60L50/51 , H02M1/0064 , B60L2210/44
摘要： In described examples, a converter circuit includes a primary-side ground, a current sensor, a control signal generator, first and second control switches, and a transformer with a center-tapped primary-side coil. A first terminal of the first control switch is coupled to a first terminal of the coil and a first input of the current sensor. A first terminal of the second control switch is coupled to a second terminal of the coil and a second input of the current sensor. Second terminals of the first and second control switches are coupled to ground. The control signal generator closes the first control switch and opens the second control switch in a first phase; opens the first control switch and closes the second control switch in a second phase that alternates with the first phase; and adjusts first phase duration in response to current sensor output, without changing converter period duration.
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公开(公告)号：US10291225B2
公开(公告)日：2019-05-14
申请号：US15728230
申请日：2017-10-09
发明人： Xiong Li , Anant Kamath
IPC分类号： H03K17/18 , H03K17/567 , G01R31/28
摘要： An isolated insulated gate bipolar transistor (IGBT) gate driver is provided which integrates circuits, in-module, to support the measurements of threshold voltage, and collector-emitter saturation voltage of IGBTs. The measured gate threshold and collector-emitter saturation voltage can be used as precursors for state of health predictions for IGBTs. During the measurements, IGBTs are biased under specific conditions chosen to quickly elicit collector-emitter saturation and gate threshold information. Integrated analog-to-digital converter (ADC) circuits are used to convert measured analog signals to a digital format. The digitalized signals are transferred to a micro controller unit (MCU) for further processing through serial peripheral interface (SPI) circuits.
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公开(公告)号：US20240028540A1
公开(公告)日：2024-01-25
申请号：US18371490
申请日：2023-09-22
IPC分类号： G06F13/38 , G06F9/4401 , G06F13/42
CPC分类号： G06F13/382 , G06F9/4413 , G06F13/4282 , G06F2213/0042
摘要： Various configurations of high-speed data communication devices, e.g., repeaters, interfacing between a host and a peripheral, and methods of operating the same, are provided to improve the Remote Wake sequence. Repeaters include circuitry to detect the start of Resume signaling or the end of Resume, following initiation of Remote Wake. In an example, pull-up resistors coupled to upstream differential signal lines and a detection circuit with a current source are controlled to detect the start of Resume signaling. In another example, the upstream-side pull-resistors and an enable signal to an upstream-side transmitter are controlled to detect the end of Resume.
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公开(公告)号：US20230291305A1
公开(公告)日：2023-09-14
申请号：US17828470
申请日：2022-05-31
摘要： Circuits and systems include a parallel resistor-capacitor (RC) network coupled between a pin and ground, and first and second transistors coupled in source follower configuration with a common gate coupling. The source of the first transistor is coupled to the pin. A first switch couples a drain of the first transistor to the common gate coupling during soft-start (SS) and decouples that connection during over current limit (OCL) sensing, and a second switch couples a drain of the second transistor to the common gate coupling during OCL sensing and decouples that connection during SS. A first current source is enabled deliver a constant current to the pin during SS. A second current source is enabled to generate a reference voltage at the source of the second transistor during OCL, which reference voltage is transferred to the pin by the source follower configuration. A comparator controls the switches to transition from SS to OCL sensing. The comparator output signal is based on a comparison of the voltage at the pin to a threshold voltage.
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公开(公告)号：US20230237002A1
公开(公告)日：2023-07-27
申请号：US17581202
申请日：2022-01-21
发明人： Anant Kamath , Suzanne M. Vining , Rakesh Hariharan , Mark Wentroble , Christopher Rodrigues , Prajwala P
CPC分类号： G06F13/385 , G06F13/4068 , G06F2213/0042
摘要： An example apparatus includes: a pullup circuit coupled to a first USB terminal; a first pulldown circuit coupled to the first USB terminal; a second pulldown circuit coupled to a second USB terminal; a third pulldown circuit coupled to a third USB terminal; a fourth pulldown circuit coupled to a fourth USB terminal; a high-speed termination detection circuit including: a current source including a first supply terminal and a second supply terminal, the first supply terminal coupled to the first USB terminal, the second supply terminal coupled to the second USB terminal; a first comparator including a first comparator terminal and a second comparator terminal, the first comparator terminal coupled to the first USB terminal; and a second comparator including a third comparator terminal and a fourth comparator terminal, the third comparator terminal coupled to the second USB terminal; and a controller including a first control terminal and a second control terminal, the first control terminal coupled to the second comparator terminal, the second control terminal coupled to the fourth comparator terminal.
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公开(公告)号：US20230065119A1
公开(公告)日：2023-03-02
申请号：US17709812
申请日：2022-03-31
IPC分类号： G06F13/38 , G06F13/42 , G06F9/4401
摘要： Various configurations of high-speed data communication devices, e.g., repeaters, interfacing between a host and a peripheral, and methods of operating the same, are provided to improve the Remote Wake sequence. Repeaters include circuitry to detect the start of Resume signaling or the end of Resume, following initiation of Remote Wake. In an example, pull-up resistors coupled to upstream differential signal lines and a detection circuit with a current source are controlled to detect the start of Resume signaling. In another example, the upstream-side pull-resistors and an enable signal to an upstream-side transmitter are controlled to detect the end of Resume.
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公开(公告)号：US11239839B2
公开(公告)日：2022-02-01
申请号：US17014828
申请日：2020-09-08
发明人： Xiong Li , Anant Kamath
IPC分类号： G01R31/26 , H03K17/18 , H03K17/567 , G01R31/28 , G01R31/42
摘要： In a power supply system, a high-side (HS) insulated-gate bipolar transistor (IGBT) has a first collector, a first gate, and a first emitter. A low-side (LS) IGBT has a second collector coupled to the first emitter, a second gate, and a second emitter. A gate drive circuit is coupled to the first gate of the HS IGBT and the second gate of the LS IGBT. A control circuit is coupled to the gate drive circuit. The control circuit is configured to control the gate drive circuit for biasing the HS IGBT to a HS saturation, and determine a HS degradation of the HS IGBT based on a HS digitized gate voltage of the HS IGBT in the HS saturation.
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公开(公告)号：US10771052B2
公开(公告)日：2020-09-08
申请号：US16371331
申请日：2019-04-01
发明人： Xiong Li , Anant Kamath
IPC分类号： H03K17/18 , H03K17/567 , G01R31/28 , G01R31/26 , G01R31/42
摘要： An isolated insulated gate bipolar transistor (IGBT) gate driver is provided which integrates circuits, in-module, to support the measurements of threshold voltage, and collector-emitter saturation voltage of IGBTs. The measured gate threshold and collector-emitter saturation voltage can be used as precursors for state of health predictions for IGBTs. During the measurements, IGBTs are biased under specific conditions chosen to quickly elicit collector-emitter saturation and gate threshold information. Integrated analog-to-digital converter (ADC) circuits are used to convert measured analog signals to a digital format. The digitalized signals are transferred to a micro controller unit (MCU) for further processing through serial peripheral interface (SPI) circuits.
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