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公开(公告)号：US20180287419A1
公开(公告)日：2018-10-04
申请号：US15477199
申请日：2017-04-03
Applicant: NXP B.V.
CPC classification number: H02J7/042 , G01C19/00 , H02J7/0029 , H02J7/0045
Abstract: One example discloses a power management circuit, wherein the power management circuit is configured to cause a device to be operated at a first power level and a second power level. The circuit includes: an RF transmitter configured to generate an RF signal having a set of transmitted RF signal attributes; an RF receiver configured to detect the RF signal having a set of received RF signal attributes; and a proximity detection circuit configured to transition the device from the first power level to the second power level in response to a preselected difference between the transmitted set of RF signal attributes and the received set of RF signal attributes.
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公开(公告)号：US10367414B2
公开(公告)日：2019-07-30
申请号：US15484976
申请日：2017-04-11
Applicant: NXP B.V.
Inventor： Marcel Wilhelm Rudolf Martin van Roosmalen , Petrus Cornelis Theodorus Laro , Humphrey de Groot , Bobby Jacob Daniel , Arjan van den Berg , Dirk Wouter Johannes Groeneveld
Abstract: A switch mode power supply is described including a primary side for coupling to a mains supply and a secondary side for coupling to a device, an isolation transformer comprising a primary coil and a secondary coil and arranged to isolate the primary side from the secondary side, and a noise filter coupled between a primary ground at the primary side and a secondary ground at the secondary side, the noise filter having a conductance value that varies with frequency. The noise filter conductance comprises a peak conductance in a peak conductance frequency region. The noise filter is operable to reduce the common-mode noise of the switch mode power supply at frequencies occurring in the peak conductance frequency region.
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公开(公告)号：US20170302164A1
公开(公告)日：2017-10-19
申请号：US15484976
申请日：2017-04-11
Applicant: NXP B.V.
Inventor： Marcel Wilhelm Rudolf Martin van Roosmalen , Petrus Cornelis Theodorus Laro , Humphrey de Groot , Bobby Jacob Daniel , Arjan van den Berg , Dirk Wouter Johannes Groeneveld
CPC classification number: H02M1/44 , H02J7/0052 , H02J2007/0059 , H02M1/126 , H02M3/33507 , H02M2001/123
Abstract: A switch mode power supply is described including a primary side for coupling to a mains supply and a secondary side for coupling to a device, an isolation transformer comprising a primary coil and a secondary coil and arranged to isolate the primary side from the secondary side, and a noise filter coupled between a primary ground at the primary side and a secondary ground at the secondary side, the noise filter having a conductance value that varies with frequency. The noise filter conductance comprises a peak conductance in a peak conductance frequency region. The noise filter is operable to reduce the common-mode noise of the switch mode power supply at frequencies occurring in the peak conductance frequency region.
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公开(公告)号：US10447068B2
公开(公告)日：2019-10-15
申请号：US15477199
申请日：2017-04-03
Applicant: NXP B.V.
Abstract: One example discloses a power management circuit, wherein the power management circuit is configured to cause a device to be operated at a first power level and a second power level. The circuit includes: an RF transmitter configured to generate an RF signal having a set of transmitted RF signal attributes; an RF receiver configured to detect the RF signal having a set of received RF signal attributes; and a proximity detection circuit configured to transition the device from the first power level to the second power level in response to a preselected difference between the transmitted set of RF signal attributes and the received set of RF signal attributes.
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