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公开(公告)号：US20180375325A1
公开(公告)日：2018-12-27
申请号：US15629949
申请日：2017-06-22
Applicant: Silicon Laboratories Inc.
Inventor： Sean A. Lofthouse , Alan L. Westwick
Abstract: A switch controls current to be supplied to an inductive load when turned on. A clamp circuit clamps a flyback voltage resulting from turning off the switch. The clamp circuit has a first clamping voltage responsive to the switch being turned off, and has a second clamping voltage, higher than the first clamping voltage, responsive to a current level through the inductive load being lower than a predetermined current level. That ensures that as the current comes down to levels required to break contact, the clamp voltage is increased to speed the collapse of the magnetic field when needed to minimize contact wear by maintaining armature momentum.
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公开(公告)号：US10756538B2
公开(公告)日：2020-08-25
申请号：US15495336
申请日：2017-04-24
Applicant: Silicon Laboratories Inc.
Inventor： Pranav R. Kaundinya , Sean A. Lofthouse
Abstract: A technique for operating a driver includes enabling the driver to provide a first current through a first terminal of a driver device of the driver in a first mode of operation. The method includes sensing a voltage drop across the first terminal and a second terminal of the driver device to generate a sensed voltage level indicative of the voltage drop. The method includes generating a comparison output signal indicative of a comparison of the sensed voltage level to a threshold voltage level. The method includes selectively enabling the driver to provide a second current in a second mode of operation based on the comparison output signal. The first current may be less than the second current. The enabling may include enabling a first portion of the driver device using a first control signal, while a second portion of the driver device is disabled using a second control signal.
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公开(公告)号：US20180309286A1
公开(公告)日：2018-10-25
申请号：US15495336
申请日：2017-04-24
Applicant: Silicon Laboratories Inc.
Inventor： Pranav R. Kaundinya , Sean A. Lofthouse
IPC: H02H9/04
Abstract: A technique for operating a driver includes enabling the driver to provide a first current through a first terminal of a driver device of the driver in a first mode of operation. The method includes sensing a voltage drop across the first terminal and a second terminal of the driver device to generate a sensed voltage level indicative of the voltage drop. The method includes generating a comparison output signal indicative of a comparison of the sensed voltage level to a threshold voltage level. The method includes selectively enabling the driver to provide a second current in a second mode of operation based on the comparison output signal. The first current may be less than the second current. The enabling may include enabling a first portion of the driver device using a first control signal, while a second portion of the driver device is disabled using a second control signal.
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4.发明申请公开(公告)号：US20210318368A1
公开(公告)日：2021-10-14
申请号：US16846731
申请日：2020-04-13
Applicant: Silicon Laboratories Inc.
Inventor： Sean A. Lofthouse , James D. Austin
Abstract: A calibration operation determines a resistance of a sense resistor in a POE system. A voltage measurement is taken with a first current flowing through the sense resistor. A second voltage measurement is taken with a second current flowing through the resistor. A resistance value of the sense resistor is determined based on a voltage difference between the first and second voltage measurements and a current difference between the first current and the second currents.
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Patent Agency Ranking
公开(公告)号：US10809777B2
公开(公告)日：2020-10-20
申请号：US15586891
申请日：2017-05-04
Applicant: Silicon Laboratories Inc.
Inventor： Pranav R. Kaundinya , Sean A. Lofthouse
Abstract: A technique for thermal management of a circuit includes generating a power consumption estimate for the circuit based on a predetermined update amount and a comparison of a sensed voltage level to a predetermined voltage level. The method includes generating a fault signal based on the power consumption estimate and a predetermined power consumption limit. Generating the power consumption estimate may include sensing a voltage drop across a first terminal of a device of the circuit and a second terminal of the device to generate the sensed voltage level. The sensed voltage level may be indicative of the voltage drop. The method may include updating the power consumption estimate by the predetermined update amount in response to a clock signal. The power consumption estimate may be used as a proxy for a measurement of a thermal state of the circuit.
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公开(公告)号：US10581241B2
公开(公告)日：2020-03-03
申请号：US15629949
申请日：2017-06-22
Applicant: Silicon Laboratories Inc.
Inventor： Sean A. Lofthouse , Alan L. Westwick
IPC: H02M1/32 , H02M1/34 , H03K17/08 , H03K17/16 , H03K17/30 , H03K17/64 , H02H9/04 , H03K17/082 , H03K17/60
Abstract: A switch controls current to be supplied to an inductive load when turned on. A clamp circuit clamps a flyback voltage resulting from turning off the switch. The clamp circuit has a first clamping voltage responsive to the switch being turned off, and has a second clamping voltage, higher than the first clamping voltage, responsive to a current level through the inductive load being lower than a predetermined current level. That ensures that as the current comes down to levels required to break contact, the clamp voltage is increased to speed the collapse of the magnetic field when needed to minimize contact wear by maintaining armature momentum.
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公开(公告)号：US20180321718A1
公开(公告)日：2018-11-08
申请号：US15586891
申请日：2017-05-04
Applicant: Silicon Laboratories Inc.
Inventor： Pranav R. Kaundinya , Sean A. Lofthouse
Abstract: A technique for thermal management of a circuit includes generating a power consumption estimate for the circuit based on a predetermined update amount and a comparison of a sensed voltage level to a predetermined voltage level. The method includes generating a fault signal based on the power consumption estimate and a predetermined power consumption limit. Generating the power consumption estimate may include sensing a voltage drop across a first terminal of a device of the circuit and a second terminal of the device to generate the sensed voltage level. The sensed voltage level may be indicative of the voltage drop. The method may include updating the power consumption estimate by the predetermined update amount in response to a clock signal. The power consumption estimate may be used as a proxy for a measurement of a thermal state of the circuit.
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公开(公告)号：US10084376B2
公开(公告)日：2018-09-25
申请号：US13917387
申请日：2013-06-13
Applicant: Silicon Laboratories Inc.
Inventor： Sean A. Lofthouse
CPC classification number: H02M3/155 , H02M2001/0045 , H02M2001/009 , Y10T307/406
Abstract: A circuit such as a subscriber line interface circuit (SLIC) has a multiple output power converter including an inductive converter, a first passive rectifier, a first capacitor, and a second passive rectifier. The inductive converter has a voltage input terminal for receiving an input voltage, and a voltage output terminal. The first passive rectifier has an input coupled to the voltage output terminal of the inductive power converter, and an output for providing a first power supply voltage. The first capacitor has a first terminal coupled to the output terminal of the inductive converter, and a second terminal. The second passive rectifier has an input coupled to the second terminal of the first capacitor, and an output terminal for providing a second power supply voltage different from the first power supply voltage.
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公开(公告)号：US20140368035A1
公开(公告)日：2014-12-18
申请号：US13917387
申请日：2013-06-13
Applicant: Silicon Laboratories Inc.
Inventor： Sean A. Lofthouse
CPC classification number: H02M3/155 , H02M2001/0045 , H02M2001/009 , Y10T307/406
Abstract: A circuit such as a subscriber line interface circuit (SLIC) has a multiple output power converter including an inductive converter, a first passive rectifier, a first capacitor, and a second passive rectifier. The inductive converter has a voltage input terminal for receiving an input voltage, and a voltage output terminal. The first passive rectifier has an input coupled to the voltage output terminal of the inductive power converter, and an output for providing a first power supply voltage. The first capacitor has a first terminal coupled to the output terminal of the inductive converter, and a second terminal. The second passive rectifier has an input coupled to the second terminal of the first capacitor, and an output terminal for providing a second power supply voltage different from the first power supply voltage.
Abstract translation: 诸如用户线接口电路（SLIC）的电路具有包括电感转换器，第一无源整流器，第一电容器和第二无源整流器的多输出功率转换器。 感应转换器具有用于接收输入电压的电压输入端子和电压输出端子。 第一无源整流器具有耦合到感应功率转换器的电压输出端的输入端和用于提供第一电源电压的输出端。 第一电容器具有耦合到感应转换器的输出端的第一端子和第二端子。 第二无源整流器具有耦合到第一电容器的第二端子的输入端和用于提供不同于第一电源电压的第二电源电压的输出端子。
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