公开(公告)号：US10063155B2

公开(公告)日：2018-08-28

申请号：US15148870

申请日：2016-05-06

Applicant: Apple Inc.

Inventor： Behzad Mohtashemi ,  Asif Hussain ,  Manisha P. Pandya ,  Mohammad J. Navabi-Shirazi ,  Nileshbhai J. Shah

IPC: H02M3/335 ,  H02M1/32 ,  H02M1/00

CPC classification number: H02M3/33523 ,  H02M1/32 ,  H02M2001/0009

Abstract: Various systems and methods are disclosed herein, which provide isolated systems with an auxiliary, multi-signal digital feedback loop for reporting a plurality of different potential fault conditions in an output system (e.g., output short circuit, output over-voltage, output under-voltage, output over temperature, etc.) to a Primary Controller in an input system. The signals may be sent according to any desired standardized (or proprietary) data transmission protocols. Use of a digital feedback loop allows the signals to be passed to the Primary Controller more quickly than is allowed by traditional analog feedback paths—and while using only a single optocoupler device for the transmission of all fault conditions. 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, monitors, as well as desktop, laptop, and tablet computers.

公开(公告)号：US20180219430A1

公开(公告)日：2018-08-02

申请号：US15804145

申请日：2017-11-06

Applicant: Apple Inc.

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

IPC: H02J50/60 ,  H02J7/02 ,  H02J50/12 ,  G01R15/18

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：US20180083490A1

公开(公告)日：2018-03-22

申请号：US15711182

申请日：2017-09-21

Applicant: Apple Inc.

Inventor： InHwan Oh ,  Manisha P. Pandya ,  Abby Cherlan ,  Bharat K. Patel

IPC: H02J50/12 ,  H04B5/00 ,  H02J5/00

CPC classification number: H02J50/12 ,  H02J5/005 ,  H04B5/0037 ,  H04B5/0093

Abstract: A power converter can be implemented as a series of power conversion stages, including a wireless power conversion stage. In typical embodiments, the power converter receives power directly from mains voltage and outputs power to a battery within an electronic device. A transmitter side of the power converter converts alternating current received from a power source (e.g., mains voltage) to an alternating current suitable for applying to a primary coil of the wireless power conversion stage of the power converter.

公开(公告)号：US09826596B2

公开(公告)日：2017-11-21

申请号：US13679781

申请日：2012-11-16

Applicant: APPLE INC.

Inventor： Asif Hussain ,  Jingdong Chen ,  Manisha P. Pandya ,  Adrian E. Sun

IPC: H05B37/00 ,  H05B37/02 ,  H05B33/08 ,  G09G3/34

CPC classification number: H05B37/02 ,  G09G3/3426 ,  H05B33/0869

Abstract: Devices and methods for controlling brightness of a display backlight are provided. A display backlight controller may control the brightness of the display backlight by changing a duty cycle of a PWM signal that drives the LED current. However, because of LED efficacy and response time, the final output brightness (NITS) may not be linear between 0% to 100%. The disclosed methods may be used to correct the brightness using a predetermined correction factor. Further, the minimum and maximum duty cycle of the output dimming duty cycle may be limited or corrected. In one example, a backlight controller receives an input duty cycle and determines a product of the input duty cycle and a maximum duty cycle to produce a reduced duty cycle. Moreover, the backlight driver may determine a corrected duty cycle using the correction factor. The final output duty cycle and LED current may then be determined.

公开(公告)号：US09345083B2

公开(公告)日：2016-05-17

申请号：US14503037

申请日：2014-09-30

Applicant: Apple Inc.

Inventor： Asif Hussain ,  Behzad Mohtashemi ,  Mohammad J. Navabi-Shirazi ,  Jingdong Chen ,  Manisha P. Pandya

IPC: H05B37/02 ,  H05B33/08 ,  G09G3/34

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 executing a pulse frequency modulation (PFM) mode of a boost converter in order to ensure that a switching frequency of the boost converter is a above an audible frequency threshold. In this way, a user operating a display device that is controlled by the boost converter will not be disturbed by audible noises generated at the display device. The PFM mode enforces an audible frequency threshold by using control circuitry designed to increase or decrease the frequency of a pulse signal depending on how the frequency of the pulse signal changes over time. The control circuitry can apply an additional load to the boost converter in order to increase the frequency of the pulse signal when the frequency is approaching the audible frequency threshold.

Abstract translation: 本文讨论的实施例涉及用于执行升压转换器的脉冲频率调制（PFM）模式的系统，方法和装置，以便确保升压转换器的开关频率高于可听频率阈值。 以这种方式，操作由升压转换器控制的显示装置的用户不会被在显示装置处产生的可听见的噪声所扰乱。 PFM模式通过使用设计用于根据脉冲信号的频率如何随时间而变化的脉冲信号的频率而设计的控制电路来实施可听频率阈值。 控制电路可以向升压转换器施加额外的负载，以便在频率接近可听频率阈值时增加脉冲信号的频率。

公开(公告)号：US09271379B2

公开(公告)日：2016-02-23

申请号：US13679728

申请日：2012-11-16

Applicant: APPLE INC.

Inventor： Asif Hussain ,  Manisha P. Pandya

IPC: G09G3/36 ,  H05B37/03 ,  G09G5/00 ,  G09G3/34 ,  H05B33/08

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：US20140139499A1

公开(公告)日：2014-05-22

申请号：US13679745

申请日：2012-11-16

Applicant: APPLE INC.

Inventor： Asif Hussain ,  Manisha P. Pandya

IPC: H05B33/08 ,  G09G5/00

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：US10148178B2

公开(公告)日：2018-12-04

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 ,  H02M1/00

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：US10034343B2

公开(公告)日：2018-07-24

申请号：US15478549

申请日：2017-04-04

Applicant: Apple Inc.

Inventor： Asif Hussain ,  Jingdong Chen ,  Manisha P. Pandya ,  Adrian E. Sun

IPC: H05B37/00 ,  H05B33/08

Abstract: A backlight driver chip for an electronic device includes an input that receives data corresponding to a brightness of a backlight device. The backlight driver chip also includes correction circuitry that determines an amplitude correction factor based at least in part on the data and the brightness of the backlight device. The correction circuitry also determines a corrected brightness based at least in part on the amplitude correction factor. The backlight driver chip further includes an output that provides a current signal that drives the backlight device, wherein the current signal is based at least in part on the corrected brightness.

公开(公告)号：US09977475B2

公开(公告)日：2018-05-22

申请号：US14831682

申请日：2015-08-20

Applicant: Apple Inc.

Inventor： InHwan Oh ,  Marco Soldano ,  Nicholas A. Sims ,  Manisha P. Pandya ,  Bogdan T. Bucheru

IPC: H02H3/20 ,  H02H9/04 ,  G06F1/26

CPC classification number: G06F1/26

Abstract: An electronic device has an I/O port, a bus connector and a transistor that is connected between the I/O port and a communications contact of the bus connector. A control circuit is connected to the transistor to maintain a gate voltage of the transistor independent of power supply voltage on a power supply contact of the connector. Other embodiments are also described and claimed.