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公开(公告)号：US20160320788A1
公开(公告)日：2016-11-03
申请号：US15143321
申请日：2016-04-29
Applicant: Apple Inc.
Inventor： Rajarshi Paul , Yehonatan Perez , Stephen J. Hrinya , Eugene L. Shoykhet
Abstract: A host electronic device may be coupled to an accessory electronic device. During normal operation, the host device may supply the accessory device with power over a power supply line. Back-powering events in which the accessory device delivers power to the host device may be prevented by interposing a protection transistor in the power supply line. A current mirror may be formed using the protection transistor and an additional transistor that produces a sense current proportional to the amount of current that is flowing through the power supply line. A current-to-voltage amplifier may produce a sense voltage that is proportional to the sense current. A bias circuit may be used to bias the sense current through the current mirror. A control circuit may compare the sense voltage to one or more reference voltages and turn off the protection transistor when appropriate to prevent back-powering of the host device.
Abstract translation: 主机电子设备可以耦合到辅助电子设备。 在正常操作期间，主机设备可以通过电源线向附件设备供电。 可以通过在电源线中插入保护晶体管来防止附件设备向主机设备传送电力的反向供电事件。 可以使用保护晶体管和产生与流过电源线的电流量成比例的感测电流的附加晶体管来形成电流镜。 电流 - 电压放大器可以产生与感测电流成正比的感测电压。 可以使用偏置电路来将感测电流偏置通过电流镜。 控制电路可以将感测电压与一个或多个参考电压进行比较，并且在适当时关闭保护晶体管以防止主机设备的反向供电。
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Patent Agency Ranking
公开(公告)号：US10048715B2
公开(公告)日：2018-08-14
申请号：US15143321
申请日：2016-04-29
Applicant: Apple Inc.
Inventor： Rajarshi Paul , Yehonatan Perez , Stephen J. Hrinya , Eugene L. Shoykhet
Abstract: A host electronic device may be coupled to an accessory electronic device. During normal operation, the host device may supply the accessory device with power over a power supply line. Back-powering events in which the accessory device delivers power to the host device may be prevented by interposing a protection transistor in the power supply line. A current mirror may be formed using the protection transistor and an additional transistor that produces a sense current proportional to the amount of current that is flowing through the power supply line. A current-to-voltage amplifier may produce a sense voltage that is proportional to the sense current. A bias circuit may be used to bias the sense current through the current mirror. A control circuit may compare the sense voltage to one or more reference voltages and turn off the protection transistor when appropriate to prevent back-powering of the host device.
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公开(公告)号：US20160094763A1
公开(公告)日：2016-03-31
申请号：US14502886
申请日：2014-09-30
Applicant: Apple Inc.
Inventor： Parin Patel , Stephen J. Hrinya
CPC classification number: H04N5/2256 , G09G3/3406 , G09G2330/02 , H02M1/36 , H02M3/1584 , H02M2001/0032 , H04M1/22 , H04M2250/12 , H04M2250/52 , H04N5/23241 , H04N5/23293 , H05B33/0815 , H05B33/0845 , H05B33/0872 , Y02B70/16
Abstract: An asymmetric multiphase boost that provides flash functionality for display backlights. A backlight power management module for a display backlight may implement and control an asymmetric multiphase boost that includes two boost phases: a primary boost phase for typical display backlighting, and a secondary or flash boost phase that provides flash functionality via the display backlight when needed. The primary boost phase may be sized to provide high low-load efficiency, high inductance, and low switching frequency for normal display backlight operations. The flash boost phase may be sized for high current and peak power, low inductance, and high switching frequency for pulsed current applications. Via the asymmetric multiphase boost, the backlight power management module may, for example, be used to provide a camera flash function for front facing cameras.
Abstract translation: 一个不对称的多相增压，为显示背光提供闪光功能。 用于显示器背光的背光源电源管理模块可以实现和控制非对称多相升压，其包括两个升压阶段：用于典型显示器背光的初级升压阶段，以及在需要时通过显示器背光提供闪光功能的次级或闪电升压阶段。 主要的升压阶段的大小可以为正常的显示器背光操作提供高的低负载效率，高电感和低开关频率。 对于脉冲电流应用，闪存升压阶段的大小可以用于高电流和峰值功率，低电感和高开关频率。 通过非对称多相增压，背光源电源管理模块可以例如用于为前置摄像机提供相机闪光功能。
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公开(公告)号：US09531931B2
公开(公告)日：2016-12-27
申请号：US14502886
申请日：2014-09-30
Applicant: Apple Inc.
Inventor： Parin Patel , Stephen J. Hrinya
CPC classification number: H04N5/2256 , G09G3/3406 , G09G2330/02 , H02M1/36 , H02M3/1584 , H02M2001/0032 , H04M1/22 , H04M2250/12 , H04M2250/52 , H04N5/23241 , H04N5/23293 , H05B33/0815 , H05B33/0845 , H05B33/0872 , Y02B70/16
Abstract: An asymmetric multiphase boost that provides flash functionality for display backlights. A backlight power management module for a display backlight may implement and control an asymmetric multiphase boost that includes two boost phases: a primary boost phase for typical display backlighting, and a secondary or flash boost phase that provides flash functionality via the display backlight when needed. The primary boost phase may be sized to provide high low-load efficiency, high inductance, and low switching frequency for normal display backlight operations. The flash boost phase may be sized for high current and peak power, low inductance, and high switching frequency for pulsed current applications. Via the asymmetric multiphase boost, the backlight power management module may, for example, be used to provide a camera flash function for front facing cameras.
Abstract translation: 一个不对称的多相增压，为显示背光提供闪光功能。 用于显示器背光的背光源电源管理模块可以实现和控制非对称多相升压，其包括两个升压阶段：用于典型显示器背光的初级升压阶段，以及在需要时通过显示器背光提供闪光功能的次级或闪电升压阶段。 主要的升压阶段的大小可以为正常的显示器背光操作提供高的低负载效率，高电感和低开关频率。 对于脉冲电流应用，闪存升压阶段的大小可以用于高电流和峰值功率，低电感和高开关频率。 通过非对称多相增压，背光源电源管理模块可以例如用于为前置摄像机提供相机闪光功能。
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公开(公告)号：US09329697B2
公开(公告)日：2016-05-03
申请号：US13629276
申请日：2012-09-27
Applicant: Apple Inc.
Inventor： Rajarshi Paul , Yehonatan Perez , Stephen J. Hrinya , Eugene L. Shoykhet
Abstract: A host electronic device may be coupled to an accessory electronic device. During normal operation, the host device may supply the accessory device with power over a power supply line. Back-powering events in which the accessory device delivers power to the host device may be prevented by interposing a protection transistor in the power supply line. A current mirror may be formed using the protection transistor and an additional transistor that produces a sense current proportional to the amount of current that is flowing through the power supply line. A current-to-voltage amplifier may produce a sense voltage that is proportional to the sense current. A bias circuit may be used to bias the sense current through the current mirror. A control circuit may compare the sense voltage to one or more reference voltages and turn off the protection transistor when appropriate to prevent back-powering of the host device.
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公开(公告)号：US20130335057A1
公开(公告)日：2013-12-19
申请号：US13629276
申请日：2012-09-27
Applicant: APPLE INC.
Inventor： Rajarshi Paul , Yehonatan Perez , Stephen J. Hrinya , Eugene L. Shoykhet
Abstract: A host electronic device may be coupled to an accessory electronic device. During normal operation, the host device may supply the accessory device with power over a power supply line. Back-powering events in which the accessory device delivers power to the host device may be prevented by interposing a protection transistor in the power supply line. A current mirror may be formed using the protection transistor and an additional transistor that produces a sense current proportional to the amount of current that is flowing through the power supply line. A current-to-voltage amplifier may produce a sense voltage that is proportional to the sense current. A bias circuit may be used to bias the sense current through the current mirror. A control circuit may compare the sense voltage to one or more reference voltages and turn off the protection transistor when appropriate to prevent back-powering of the host device.
Abstract translation: 主机电子设备可以耦合到辅助电子设备。 在正常操作期间，主机设备可以通过电源线向附件设备供电。 可以通过在电源线中插入保护晶体管来防止附件设备向主机设备传送电力的反向供电事件。 可以使用保护晶体管和产生与流过电源线的电流量成比例的感测电流的附加晶体管来形成电流镜。 电流 - 电压放大器可以产生与感测电流成正比的感测电压。 可以使用偏置电路来将感测电流偏置通过电流镜。 控制电路可以将感测电压与一个或多个参考电压进行比较，并且在适当时关闭保护晶体管以防止主机设备的反向供电。
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