公开(公告)号：US11264900B2

公开(公告)日：2022-03-01

申请号：US16793516

申请日：2020-02-18

Applicant: Apple Inc.

Inventor： Bogdan-Eugen Matei ,  Alessandro Molari ,  Fabio Ongaro ,  Giovanni Saccomanno ,  Hao Zhou

IPC: H02M3/158 ,  H02M1/00 ,  H02M3/156

Abstract: The present disclosure is directed to a pulse frequency modulation (PFM) control method for a boost converter and apparatus for carrying out the method. A boost converter includes an inductor and a transistor coupled thereto. A control circuit is arranged to control the transistor to cause current pulsed to be sourced through the inductor. When operating in a PFM mode, the control circuit may control the timing of pulses such that, at the beginning of a specified time period, current pulses may be sourced with no spacing between successive pulses. After a desired number of pulses have been sourced, no pulses are sourced for the remainder of the specified time period. Nevertheless, the number of pulses sourced over the time period corresponds to a desired average frequency of pulses.

公开(公告)号：US10694603B1

公开(公告)日：2020-06-23

申请号：US16684567

申请日：2019-11-14

Applicant: Apple Inc.

Inventor： Cristian Grecu ,  Bogdan-Eugen Matei ,  Angelo Bassi ,  Andrei-Cosmin Gaidam ,  Alessandro Molari

IPC: H05B45/10 ,  H05B45/37 ,  H05B45/44

Abstract: An LED driver circuit is disclosed. The LED driver circuit includes an amplifier having a first input coupled to receive a reference voltage and a second input coupled to receive a feedback voltage. The circuit further includes first and second transistors each having respective gate terminals coupled to an output of the first amplifier. In a first mode, a first switch alternately couples a source terminal of the first transistor to the second input of the amplifier (when the pulse is asserted) and a source terminal of the second transistor to the second input (when the pulse is de-asserted). A third transistor includes a gate terminal that is coupled to ground, by a second switch, when operating in the first mode. When operating in the second mode, the switch couples the third transistor to the output of the amplifier, while the pulse remains asserted.

公开(公告)号：US20240077932A1

公开(公告)日：2024-03-07

申请号：US18122410

申请日：2023-03-16

Applicant: Apple Inc.

Inventor： Talbott M. Houk ,  Wenxun Huang ,  Nikola Jovanovic ,  Floyd L. Dankert ,  Sanjay Pant ,  Alessandro Molari ,  Siarhei Meliukh ,  Nicola Florio ,  Ludmil N. Nikolov ,  Nathan F. Hanagami ,  Hartmut Sturm ,  Di Zhao ,  Chad L. Olson ,  John J. Sullivan ,  Seyedeh Maryam Mortazavi Zanjani ,  Tristan R. Hudson ,  Jay B. Fletcher ,  Jonathan A. Dutra

IPC: G06F1/3296 ,  G06F1/3212 ,  G06F1/3234

CPC classification number: G06F1/3296 ,  G06F1/3212 ,  G06F1/3278

Abstract: The present disclosure describes a system with a power management device, a wakeup circuit, a battery management device, and a connector. During a powered down mode of operation, the battery management device can provide, via the connector, a bias voltage to the wakeup circuit. In response to a wakeup switch being activated, the battery management device can provide a power supply (e.g., from a battery) to the power management device. Benefits of the wakeup circuit include (1) a reduction of battery consumption—and thus improving battery lifetime—when the electronic system is in a powered down mode of operation because the wakeup circuit has lower number of active components compared to other designs and (2) a non-complex wakeup circuit design because one or more existing connector interconnects between the power management device and the battery management device can be re-used during electronic system's powered down mode of operation.

公开(公告)号：US20210153320A1

公开(公告)日：2021-05-20

申请号：US16908425

申请日：2020-06-22

Applicant: Apple Inc.

Inventor： Cristian Grecu ,  Bogdan-Eugen Matei ,  Angelo Bassi ,  Andrei-Cosmin Gaidam ,  Alessandro Molari

IPC: H05B45/37 ,  H05B45/10 ,  H05B45/44

Abstract: An LED driver circuit is disclosed. The LED driver circuit includes an amplifier having a first input coupled to receive a reference voltage and a second input coupled to receive a feedback voltage. The circuit further includes first and second transistors each having respective gate terminals coupled to an output of the first amplifier. In a first mode, a first switch alternately couples a source terminal of the first transistor to the second input of the amplifier (when the pulse is asserted) and a source terminal of the second transistor to the second input (when the pulse is de-asserted). A third transistor includes a gate terminal that is coupled to ground, by a second switch, when operating in the first mode. When operating in the second mode, the switch couples the third transistor to the output of the amplifier, while the pulse remains asserted.

公开(公告)号：US11166355B2

公开(公告)日：2021-11-02

申请号：US16908425

申请日：2020-06-22

Applicant: Apple Inc.

Inventor： Cristian Grecu ,  Bogdan-Eugen Matei ,  Angelo Bassi ,  Andrei-Cosmin Gaidam ,  Alessandro Molari

IPC: H05B45/10 ,  H05B45/37 ,  H05B45/44

Abstract: An LED driver circuit is disclosed. The LED driver circuit includes an amplifier having a first input coupled to receive a reference voltage and a second input coupled to receive a feedback voltage. The circuit further includes first and second transistors each having respective gate terminals coupled to an output of the first amplifier. In a first mode, a first switch alternately couples a source terminal of the first transistor to the second input of the amplifier (when the pulse is asserted) and a source terminal of the second transistor to the second input (when the pulse is de-asserted). A third transistor includes a gate terminal that is coupled to ground, by a second switch, when operating in the first mode. When operating in the second mode, the switch couples the third transistor to the output of the amplifier, while the pulse remains asserted.

公开(公告)号：US20210257911A1

公开(公告)日：2021-08-19

申请号：US16793516

申请日：2020-02-18

Applicant: Apple Inc.

Inventor： Bogdan-Eugen Matei ,  Alessandro Molari ,  Fabio Ongaro ,  Giovanni Saccomanno ,  Hao Zhou

IPC: H02M3/158

Abstract: The present disclosure is directed to a pulse frequency modulation (PFM) control method for a boost converter and apparatus for carrying out the method. A boost converter includes an inductor and a transistor coupled thereto. A control circuit is arranged to control the transistor to cause current pulsed to be sourced through the inductor. When operating in a PFM mode, the control circuit may control the timing of pulses such that, at the beginning of a specified time period, current pulses may be sourced with no spacing between successive pulses. After a desired number of pulses have been sourced, no pulses are sourced for the remainder of the specified time period. Nevertheless, the number of pulses sourced over the time period corresponds to a desired average frequency of pulses.