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公开(公告)号：US10859603B1
公开(公告)日：2020-12-08
申请号：US16734017
申请日：2020-01-03
Applicant: Apple Inc.
Inventor： Erhan Ozalevli , Evaldo M. Miranda, Jr. , Behzad Mohtashemi
IPC: H03K17/082 , G01R15/14 , H03F3/45
Abstract: Embodiments relate to sensing a current provided by a power supply circuit. The current sensing circuit includes a sense transistor for sensing the current provided by a main transistor, a driver for controlling a bias provided to the sense transistor and the main transistor, and a sense resistor for converting the sensed current to a voltage value. Moreover, the current sensing circuit includes a controller that modifies at least one of: (a) a resistance of the main transistor by adjusting the bias voltage provided by the driver, (b) a gain ratio between a load current and a sensing current by adjusting a number of individual devices that are active in the sense transistor, and (c) a resistance of the sense resistor.
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公开(公告)号：US20180091054A1
公开(公告)日：2018-03-29
申请号：US15646035
申请日：2017-07-10
Applicant: Apple Inc.
Inventor： InHwan Oh , Manisha P. Pandya , Behzad Mohtashemi
CPC classification number: H02M3/158 , H02M1/083 , H02M3/1588 , H02M2001/0009
Abstract: A power converter includes a buck converter with a low-side switch. During a discharge mode, current passes through the low-side switch to form a current loop. The low-side switch is typically closed synchronously with the opening of a high-side switch coupled to an input voltage level to the buck converter. The power converter also includes a high-side controller and a low-side controller, which together are configured to adjust the timing of the operation mode of the high-side controller between a storage mode and the discharge mode.
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公开(公告)号：US11823612B2
公开(公告)日：2023-11-21
申请号：US17853247
申请日：2022-06-29
Applicant: Apple Inc.
Inventor： Behzad Mohtashemi , Asif Hussain , Feng Guo , Jingdong Chen , Ming Gu , Mohammad J Navabi-Shirazi , Omar Alnaggar , Venkataraman V Iyer , Yang Zhang
IPC: G09G3/20
CPC classification number: G09G3/2092 , G09G2310/0264 , G09G2310/08
Abstract: A display device include a first light emitting diode (LED), a second LED, and at least one processor of a driver. The processor drives the first LED and the second LED. The processor determines a first pulse width associated with the first LED and a second pulse width associated with the second LED based on a level of brightness to be emitted by the first LED and the second LED. The processor also receives a gap clock and determines a first pulse start time and a first pulse end time for the first LED based on the first pulse width. Moreover, the processor determines a second pulse start time and a second pulse end time for the second LED based on the first pulse end time, the second pulse width, and/or the gap clock, in which the first pulse end time and the second pulse end time are different.
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4.发明申请公开(公告)号：US20230100812A1
公开(公告)日：2023-03-30
申请号：US17870576
申请日：2022-07-21
Applicant: Apple Inc.
Inventor： Behzad Mohtashemi , Mohammad J Navabi-Shirazi , Feng Guo , Omar Alnaggar , Venkataraman V Iyer , Jingdong Chen , Yang Zhang , Ming Gu , Asif Hussain
IPC: G09G3/34
Abstract: Systems and methods for preserving a pulse width modulation (PWM) resolution while increasing the frequency of a pulse width modulation (PWM) clock are provided. An electronic display backlight system may include a backlight element and backlight dimming circuitry. The backlight element may be driven according to a pulse width modulation (PWM) signal over a PWM clock cycle equal to a multiple M of a baseline PWM clock frequency associated with a baseline PWM resolution. The backlight dimming circuitry may receive a brightness code of the baseline PWM resolution and generate the PWM signal at least in part by dividing the brightness code by M.
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公开(公告)号：US20220061135A1
公开(公告)日：2022-02-24
申请号：US17238851
申请日：2021-04-23
Applicant: Apple Inc.
Inventor： Ming Gu , Yanhui Xie , Jingdong Chen , Asif Hussain , Behzad Mohtashemi , Mohammad Jafar Navabi-Shirazi , Linda A. Kamas , Alejandro Lara Ascorra
IPC: H05B45/14 , H05B45/325 , G09G3/34
Abstract: Aspects of the subject technology relate to electronic devices having a display. The display includes a channel of light emitting diodes (LEDs) having controllable brightness levels and control circuitry coupled to the channel of LEDs. The control circuitry provides a pulse width modulated (PWM) signal having a duty cycle to control the brightness levels. An adaptive headroom control circuitry is configured to sense a headroom voltage signal for the channel of LEDs and apply a first time period for blanking the headroom voltage signal during the first time period that is associated with a settling time for the headroom voltage signal.
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Patent Agency Ranking
公开(公告)号：US11237191B2
公开(公告)日：2022-02-01
申请号：US17092158
申请日：2020-11-06
Applicant: Apple Inc.
Inventor： Erhan Ozalevli , Evaldo M. Miranda, Jr. , Behzad Mohtashemi
IPC: G01R15/14 , H03K17/082 , H03F3/45
Abstract: Embodiments relate to sensing a current provided by a power supply circuit. The current sensing circuit includes a sense transistor for sensing the current provided by a main transistor, a driver for controlling a bias provided to the sense transistor and the main transistor, and a sense resistor for converting the sensed current to a voltage value. Moreover, the current sensing circuit includes a controller that modifies at least one of: (a) a resistance of the main transistor by adjusting the bias voltage provided by the driver, (b) a gain ratio between a load current and a sensing current by adjusting a number of individual devices that are active in the sense transistor, and (c) a resistance of the sense resistor.
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公开(公告)号：US20160329830A1
公开(公告)日：2016-11-10
申请号：US15148245
申请日：2016-05-06
Applicant: Apple Inc.
Inventor： Asif Hussain , Behzad Mohtashemi , Manisha P. Pandya , Mohammad J. Navabi-Shirazi
CPC classification number: H02M7/537 , H02M1/08 , H02M3/158 , H02M2001/0009 , H02M2001/0058 , Y02B70/1425 , Y02B70/1483 , Y02B70/1491
Abstract: Various systems, apparatuses, and methods are disclosed herein, which provide a new power conversion topology for isolated systems that does not include a transformer. Embodiments of the inventive systems comprise: a switching system utilizing high voltage, low leakage switches, e.g., Silicon Carbide (SiC) MOS-FETs; a power source; an inductor and a capacitor operating as a link stage resonant LC circuit; and a load. The switching system may be configured to be controlled in a synchronized ‘four phase’ control loop process, wherein the input switches are prevented from being closed at the same time as the output switches, thereby providing electrical isolation between the input power source and the load—without the use of a transformer. The techniques disclosed herein are applicable to any number of isolated systems that supply power to electronic systems such as: digital cameras, mobile phones, watches, personal data assistants (PDAs), portable music players, displays, and computers.
Abstract translation: 本文公开了各种系统，装置和方法，其为不包括变压器的隔离系统提供新的功率转换拓扑。 本发明系统的实施例包括：利用高电压，低泄漏开关（例如碳化硅（SiC））MOS-FET的开关系统; 电源; 作为链路级谐振LC电路的电感器和电容器; 和一个负载。 开关系统可以被配置为被控制在同步的“四相”控制环路过程中，其中防止输入开关与输出开关同时闭合，从而在输入电源和负载之间提供电隔离 - 不使用变压器。 本文公开的技术适用于向诸如数字照相机，移动电话，手表，个人数据助理（PDA），便携式音乐播放器，显示器和计算机之类的电子系统供电的任何数量的隔离系统。
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公开(公告)号：US20230085621A1
公开(公告)日：2023-03-23
申请号：US17853247
申请日：2022-06-29
Applicant: Apple Inc.
Inventor： Behzad Mohtashemi , Asif Hussain , Feng Guo , Jingdong Chen , Ming Gu , Mohammad J. Navabi-Shirazi , Omar Alnaggar , Venkataraman V. Iyer , Yang Zhang
IPC: G09G3/20
Abstract: A display device include a first light emitting diode (LED), a second LED, and at least one processor of a driver. The processor drives the first LED and the second LED. The processor determines a first pulse width associated with the first LED and a second pulse width associated with the second LED based on a level of brightness to be emitted by the first LED and the second LED. The processor also receives a gap clock and determines a first pulse start time and a first pulse end time for the first LED based on the first pulse width. Moreover, the processor determines a second pulse start time and a second pulse end time for the second LED based on the first pulse end time, the second pulse width, and/or the gap clock, in which the first pulse end time and the second pulse end time are different.
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公开(公告)号：US20210208184A1
公开(公告)日：2021-07-08
申请号：US17092158
申请日：2020-11-06
Applicant: Apple Inc.
Inventor： Erhan Ozalevli , Evaldo M. Miranda, JR. , Behzad Mohtashemi
IPC: G01R15/14 , H03F3/45 , H03K17/082
Abstract: Embodiments relate to sensing a current provided by a power supply circuit. The current sensing circuit includes a sense transistor for sensing the current provided by a main transistor, a driver for controlling a bias provided to the sense transistor and the main transistor, and a sense resistor for converting the sensed current to a voltage value. Moreover, the current sensing circuit includes a controller that modifies at least one of: (a) a resistance of the main transistor by adjusting the bias voltage provided by the driver, (b) a gain ratio between a load current and a sensing current by adjusting a number of individual devices that are active in the sense transistor, and (c) a resistance of the sense resistor.
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公开(公告)号：US10009968B2
公开(公告)日：2018-06-26
申请号：US15069724
申请日：2016-03-14
Applicant: Apple Inc.
Inventor： Jingdong Chen , Asif Hussain , Behzad Mohtashemi , Manisha P. Pandya , Mohammad J. Navabi-Shirazi
CPC classification number: H05B33/0815 , G09G3/3406 , G09G2330/06 , H05B33/086
Abstract: This application relates to systems, methods, and apparatus for controlling a switching frequency of a boost or flyback converter to be above an audible frequency range when operating the boost or flyback converter in a pulse frequency modulation (PFM) mode. The boost or flyback converter uses one or more switches for converting power for a display panel. In order to boost the switching frequency when operating in the PFM mode, the boost or flyback converter can selectively implement certain current and/or voltage limits for pulses that are generated as a result of the switching. The current and/or voltage limits can be set according to a load of the boost or flyback converter, and a correspondence between the current and/or voltage limits and the loads can be stored in a lookup table accessible to the boost or flyback converter.
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