公开(公告)号：US09941800B2

公开(公告)日：2018-04-10

申请号：US14843777

申请日：2015-09-02

Applicant: Apple Inc.

Inventor： Juan Carlos Pastrana ,  Manisha P. Pandya ,  Sameer G. Kelkar ,  Nicholas A. Sims

IPC: H02M3/335 ,  G01R19/00 ,  H02M1/00

CPC classification number: H02M3/33507 ,  G01R19/0084 ,  H02M2001/0022

Abstract: The disclosed embodiments provide a system that operates switched-mode power supplies, such as flyback converters. The power supplies may comprise isolated or non-isolated power converters. During operation, the system senses an on-time of a primary switch in the power converter. Upon detecting that the on-time does not exceed an on-time threshold within a first pre-specified period that spans one or more switching cycles, the system extends the on-time during a subsequent switching cycle to at least meet the on-time threshold. The system may then measure the voltage on one or more reference windings of the power converter during the on-time of the subsequent switching cycle, wherein the reference winding may comprise, e.g., an auxiliary winding of the primary winding of the power converter or a secondary winding of the power converter (e.g., in the case of isolated power converters utilizing a transformer).

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

IPC: H02M3/158 ,  H02M1/08

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.

公开(公告)号：US09814106B2

公开(公告)日：2017-11-07

申请号：US14502945

申请日：2014-09-30

Applicant: Apple Inc.

Inventor： Asif Hussain ,  Andrew P. Aitken ,  Manisha P. Pandya

IPC: G09G3/34 ,  H05B33/08

CPC classification number: H05B33/0815 ,  G09G3/3406 ,  G09G3/342 ,  G09G2310/08 ,  G09G2320/0233 ,  G09G2320/064 ,  Y02B20/346

Abstract: The embodiments discussed herein relate to systems, methods, and apparatus for synchronizing a pulse width modulation (PWM) dimming clock signal with a frame rate signal, line sync signal, and/or a horizontal sync signal of a display device. The PWM dimming clock signal can be generated by a synchronization block having a programmable offset/delay. The programmable offset/delay can control the offset or phase difference between an input and an output clock signal of the synchronization block. Depending on the clock rate of PWM dimming and/or panel resolution, the phase/offset delay can be adjusted to achieve the optimum front of screen performance. Additionally, an input clock generator/missing pulse detection block can output a programmed clock signal to the synchronization block in case of a missing external clock, or insert a pulse when there is a missing pulse detected.

公开(公告)号：US20160065080A1

公开(公告)日：2016-03-03

申请号：US14843777

申请日：2015-09-02

Applicant: Apple Inc.

Inventor： Juan Carlos Pastrana ,  Manisha P. Pandya ,  Sameer G. Kelkar ,  Nicholas A. Sims

IPC: H02M3/335 ,  G01R19/00

CPC classification number: H02M3/33507 ,  G01R19/0084 ,  H02M2001/0022

Abstract: The disclosed embodiments provide a system that operates switched-mode power supplies, such as flyback converters. The power supplies may comprise isolated or non-isolated power converters. During operation, the system senses an on-time of a primary switch in the power converter. Upon detecting that the on-time does not exceed an on-time threshold within a first pre-specified period that spans one or more switching cycles, the system extends the on-time during a subsequent switching cycle to at least meet the on-time threshold. The system may then measure the voltage on one or more reference windings of the power converter during the on-time of the subsequent switching cycle, wherein the reference winding may comprise, e.g., an auxiliary winding of the primary winding of the power converter or a secondary winding of the power converter (e.g., in the case of isolated power converters utilizing a transformer).

Abstract translation: 所公开的实施例提供了操作开关模式电源的系统，例如反激式转换器。 电源可以包括隔离或非隔离的电力转换器。 在运行期间，系统检测电力转换器中的主开关的接通时间。 一旦检测到在一个或多个开关周期的第一个预定的周期内导通时间不超过准时间阈值，则系统在随后的切换周期期间延长导通时间，至少满足接通时间 阈。 然后，系统可以在随后的开关周期的接通时间期间测量功率转换器的一个或多个参考绕组上的电压，其中基准绕组可以包括例如功率转换器的初级绕组的辅助绕组或 功率转换器的二次绕组（例如，在使用变压器的隔离电力转换器的情况下）。

公开(公告)号：US09125303B2

公开(公告)日：2015-09-01

申请号：US13889220

申请日：2013-05-07

Applicant: Apple Inc.

Inventor： Kevin S. Fetterman ,  Kathleen A. Bergeron ,  John Douglas Field ,  Edward H. Frank ,  Michelle R. Goldberg ,  Harsha Lakshmanan ,  Manisha P. Pandya ,  Bharat K. Patel ,  Deborah Claire Sharrah ,  Steve Xing-Fu Zhou

IPC: H05K1/02 ,  H02M7/00 ,  H02M1/12

CPC classification number: H05K1/0213 ,  H02M1/12 ,  H02M7/003 ,  H05K1/0218 ,  H05K1/0262 ,  H05K2201/0715 ,  H05K2201/09309 ,  H05K2201/10409

Abstract: One embodiment of a power supply input routing apparatus can include a multilayer printed circuit board configured to accept only an alternating current (AC) line voltage, return and ground signals. The AC power jumper board can advantageously route AC power from one section of the power supply to another without burdening the power supply design with extra layer requirements or negatively increasing power supply area. Embodiments including an electronic device having a power supply as above are also disclosed.

Abstract translation: 电源输入路由设备的一个实施例可以包括被配置为仅接受交流（AC）线路电压，返回和接地信号的多层印刷电路板。 交流电源跳线板可以有利地将交流电源从电源的一部分传递到另一部分，而不会对额外的层要求或负增加的电源区域的电源设计造成负担。 还公开了具有如上所述的电源的电子设备的实施例。

公开(公告)号：US09076357B2

公开(公告)日：2015-07-07

申请号：US13679745

申请日：2012-11-16

Applicant: APPLE INC.

Inventor： Asif Hussain ,  Manisha P. Pandya

IPC: G09G3/36 ,  G09G5/00 ,  H05B33/08 ,  G09G3/34

CPC classification number: G09G5/00 ,  G09G3/3406 ,  G09G2300/0426 ,  G09G2310/0264 ,  G09G2330/04 ,  G09G2330/08 ,  H05B33/0827 ,  H05B33/0893

Abstract: Disclosed embodiments relate to techniques for operating a backlight unit of a display device in a redundant mode and a non-redundant mode in the event of a shorted LED failure condition. For instance, in a redundant mode, multiple LED strings arranged in an end-to-end configuration are each driven to provide a first quantity of light, such that the combined output from all LED strings is capable of providing a total light output corresponding to a maximum brightness setting for the display device. In the case that an LED on one of the strings fails due to a shorted LED failure condition, the remaining functional LEDs of the affected string may be driven to provide a second quantity of light, such that the combined output from the affected strings and the non-affected strings may still provide the same total light output for achieving the maximum brightness setting. The second quantity of light is greater than the first quantity.

Abstract translation: 公开的实施例涉及在LED短路故障情况下以冗余模式和非冗余模式操作显示装置的背光单元的技术。 例如，在冗余模式中，以端对端配置布置的多个LED串每个被驱动以提供第一数量的光，使得来自所有LED串的组合输出能够提供对应于 显示设备的最大亮度设置。 在由于LED故障条件短路引起的一个串中的LED发生故障的情况下，可以驱动受影响的串的剩余功能LED以提供第二数量的光，使得来自受影响的串和 不受影响的字符串可能仍然提供相同的总光输出以实现最大亮度设置。 第二光量大于第一数量。

公开(公告)号：US20140139498A1

公开(公告)日：2014-05-22

申请号：US13679728

申请日：2012-11-16

Applicant: APPLE INC.

Inventor： Asif Hussain ,  Manisha P. Pandya

IPC: H05B37/03 ,  G09G5/00 ,  H01J9/00

CPC classification number: H05B37/036 ,  G09G3/342 ,  G09G5/00 ,  G09G2320/064 ,  G09G2330/08 ,  G09G2330/12 ,  H05B33/08 ,  H05B33/0815 ,  H05B33/0827

Abstract: Disclosed embodiments relate to techniques for operating a backlight unit of a display device in a redundant mode and a non-redundant mode in the event of an open circuit condition or short string condition. For instance, in a redundant mode, multiple LED strings are driven to provide a first quantity of light, such that the combined output from all LED strings is capable of providing a total light output corresponding to a maximum brightness setting for the display device. In the case that one of the LED strings fails due to an open circuit condition or short string condition, the remaining LED strings may be driven to provide a second quantity of light that is greater than the first, such that the combined light output from the remaining LED strings provides the same total light output for achieving the maximum brightness setting.

Abstract translation: 公开的实施例涉及在开路状况或短串条件的情况下以冗余模式和非冗余模式操作显示装置的背光单元的技术。 例如，在冗余模式中，多个LED串被驱动以提供第一数量的光，使得来自所有LED串的组合输出能够提供对应于显示装置的最大亮度设置的总光输出。 在LED串中的一个由于开路条件或短串条件而失效的情况下，可以驱动剩余的LED串以提供大于第一数量的第二量的光，使得从 剩余的LED串提供相同的总光输出以实现最大亮度设置。

公开(公告)号：US11462950B2

公开(公告)日：2022-10-04

申请号：US16702372

申请日：2019-12-03

Applicant: Apple Inc.

Inventor： Antoin J. Russell ,  Bharat K. Patel ,  Manisha P. Pandya ,  Zaki Moussaoui

IPC: H02J7/00 ,  H02J50/60 ,  G01R15/18 ,  H02J50/12

Abstract: A wireless power transmitting device transmits wireless power signals to a wireless power receiving device using an output circuit that includes a wireless power transmitting coil. Measurement circuitry is coupled to the output circuit to help determine whether the wireless power receiving device is present and ready to accept transmission of wireless power. The measurement circuitry includes a measurement circuit that is coupled to the output circuit and that measures signals while oscillator circuitry supplies the output circuit with signals at a probe frequency. The measurement circuitry also includes a measurement circuit that is coupled to the output circuit and that measures signals while the oscillator circuitry sweeps signals applied to the output circuit between a first frequency and a second frequency to detect sensitive devices such as radio-frequency identification devices. Impulse response circuitry in the measurement circuitry is used to make inductance and Q factor measurements.

公开(公告)号：US10555389B2

公开(公告)日：2020-02-04

申请号：US16232913

申请日：2018-12-26

Applicant: Apple Inc.

Inventor： Yanhui Xie ,  Asif Hussain ,  Jingdong Chen ,  Manisha P. Pandya

IPC: H05B37/00 ,  H05B33/08 ,  G02F1/1335

Abstract: Aspects of the subject technology relate to display of an electronic device. The display includes a backlight unit having a voltage source, a string of light-emitting diodes and a bypass switch for each light-emitting diode in the string. The string of light-emitting diodes can receive, at a first end, a supply voltage from the voltage source. The bypass switch for each light-emitting diode is controllable to pulse-width-modulate that light-emitting diode. The headroom voltage feedback circuit is coupled to a second end of the string.

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

IPC: H05B33/08 ,  G09G3/34

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.