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公开(公告)号：US20240096291A1
公开(公告)日：2024-03-21
申请号：US18243011
申请日：2023-09-06
Applicant: Apple Inc.
Inventor： Ming Sun , Nicola Rasera , Robert D Zucker , Johan L Piper , Denis M Darmon , Fabio Ongaro , Xiaofeng Wang
IPC: G09G3/34
CPC classification number: G09G3/3413 , G09G3/346 , G09G2320/0209 , G09G2320/0247 , G09G2330/021
Abstract: Systems and methods for electronic displays to use reference voltages to control driving current of illuminators are provided. The reference voltages are used to reduce or eliminate cross talk in driving voltages among different illuminators and driving voltage variations from frame to frame. The transient performance of the driving current of the illuminator (e.g., the current rise/decline time, current overshoot issue, current settling time) may be improved by implementing the reference voltages.
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公开(公告)号：US20190229622A1
公开(公告)日：2019-07-25
申请号：US16373616
申请日：2019-04-02
Applicant: Apple Inc.
Inventor： Michael Couleur , Fabio Ongaro , Nikola Jovanovic , Frank Trautmann
Abstract: An apparatus includes a plurality of pulse control circuits and a control circuit. A given pulse control circuit of the plurality of pulse control circuits may source a current pulse to the output power signal based on a comparison of a particular feedback signal of a plurality of feedback signals and a target voltage signal. The control circuit may offset a voltage level of each feedback signal of a first subset of the plurality of feedback signals. The first subset may exclude a first feedback signal. In response to a determination that a period of time has ended, the control circuit may offset a voltage level of each feedback signal of a second subset of the plurality of feedback signals. The second subset may include the first feedback signal and exclude a second feedback signal.
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公开(公告)号：US20210075321A1
公开(公告)日：2021-03-11
申请号：US16566784
申请日：2019-09-10
Applicant: Apple Inc.
Inventor： Giovanni Saccomanno , Bogdan-Eugen Matei , Fabio Ongaro
Abstract: A power converter circuit that includes a switch node coupled to a regulated power supply node via an inductor may, in response an assertion of a control signal, source current to the regulated power supply node. In response to initiating a charge cycle, a control circuit may assert the control signal. During an assertion of the control signal, the control circuit may adjust a slope of a transition of the control signal using a voltage level of the switch node.
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公开(公告)号：US20180248481A1
公开(公告)日：2018-08-30
申请号：US15444594
申请日：2017-02-28
Applicant: Apple Inc.
Inventor： Michael Couleur , Fabio Ongaro , Dashun Xue
IPC: H02M3/158
CPC classification number: H02M3/158
Abstract: A regulator circuit that employs coupled inductors with on-time modulation is disclosed. The regulator circuit includes a driver circuit coupled via first and second inductors to a power supply node of a load circuit, and may charge the power supply node via the first inductor for a first charging period, and charge the power supply node via the second inductor for a second charging period. A control circuit may determine durations of the first and second charging periods using respective pluralities of currents.
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公开(公告)号：US12272321B2
公开(公告)日：2025-04-08
申请号：US18243011
申请日：2023-09-06
Applicant: Apple Inc.
Inventor： Ming Sun , Nicola Rasera , Robert D Zucker , Johan L Piper , Denis M Darmon , Fabio Ongaro , Xiaofeng Wang
IPC: G09G3/34
Abstract: Systems and methods for electronic displays to use reference voltages to control driving current of illuminators are provided. The reference voltages are used to reduce or eliminate cross talk in driving voltages among different illuminators and driving voltage variations from frame to frame. The transient performance of the driving current of the illuminator (e.g., the current rise/decline time, current overshoot issue, current settling time) may be improved by implementing the reference voltages.
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Patent Agency Ranking
公开(公告)号：US20240429931A1
公开(公告)日：2024-12-26
申请号：US18338956
申请日：2023-06-21
Applicant: Apple Inc.
Inventor： Nicola Rasera , Cristian Grecu , Bogdan-Eugen Matei , Fabio Ongaro , Ming Sun
IPC: H03M1/10
Abstract: A piecewise linear current-mode digital-to-analog converter circuit approximates an exponential output current over a range of input codes by generating linearly varying currents with different slopes of different ranges of the input codes. The piecewise linear current-mode digital-to-analog converter circuit includes a current generator circuit that generates the output current based on a reference voltage and a feedback signal. A variable resistance circuit is used to generate the feedback signal using the output current. Respective values of the reference voltage and the variable resistance circuit vary as a function of the input code.
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公开(公告)号：US20210218343A1
公开(公告)日：2021-07-15
申请号：US16743443
申请日：2020-01-15
Applicant: Apple Inc.
Inventor： Bogdan-Eugen Matei , Alessandro S. Molari , Angelo Bassi , Fabio Ongaro , Giovanni Saccomanno
Abstract: A DC-DC converter providing adaptive peak current control is disclosed. A DC-DC converter includes an inductor having first and second terminals coupled to a voltage source and a transistor, respectively. The DC-DC circuit further includes a control circuit configured to control activation of the transistor. A first control block of the control circuit controls the transistor (and thus the inductor peak current) using pulse frequency modulation (PFM). A second control block controls the transistor using pulse width modulation (PWM) and PFM. In a first mode of operation, the control circuit activates the transistor, using PFM, such that the peak-to-peak current through the inductor has a fixed value. In a second mode of operation, the control circuit activates the transistor such that the peak-to-peak current through the inductor is modulated, using both PWM and PFM.
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公开(公告)号：US20190109537A1
公开(公告)日：2019-04-11
申请号：US16197711
申请日：2018-11-21
Applicant: Apple Inc.
Inventor： Fabio Ongaro , Michael Couleur
Abstract: Systems, apparatuses, and methods for efficiently generating a stable output for a transient load for one or more components are described. In various embodiments, a power converter includes two feedback loops to separate the stability and the equivalent output resistance, which allows the bandwidth to increase. The first loop includes a compensator receiving an output current of an amplifier. Additionally, a first converter and a first current mirror generate a target current based on the output current of the amplifier. Based on the target current, multiple step-down converters generate an output voltage, which is returned to the amplifier through a resistor. The second loop includes a second converter with a first order series RC filter to reduce the second loop's response time. A second current mirror receives current from the second converter and generates a dynamically adapting feedback current, which flows through the resistor in the first loop.
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公开(公告)号：US10141841B1
公开(公告)日：2018-11-27
申请号：US15691472
申请日：2017-08-30
Applicant: Apple Inc.
Inventor： Fabio Ongaro , Michael Couleur
Abstract: Systems, apparatuses, and methods for efficiently generating a stable output for a transient load for one or more components are described. In various embodiments, a power converter includes two feedback loops to separate the stability and the equivalent output resistance, which allows the bandwidth to increase. The first loop includes a compensator receiving an output current of an amplifier. Additionally, a first converter and a first current mirror generate a target current based on the output current of the amplifier. Based on the target current, multiple step-down converters generate an output voltage, which is returned to the amplifier through a resistor. The second loop includes a second converter with a first order series RC filter to reduce the second loop's response time. A second current mirror receives current from the second converter and generates a dynamically adapting feedback current, which flows through the resistor in the first loop.
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公开(公告)号：US11594957B2
公开(公告)日：2023-02-28
申请号：US17203567
申请日：2021-03-16
Applicant: Apple Inc.
Inventor： Bogdan-Eugen Matei , Cristian Grecu , Fabio Ongaro , Giovanni Saccomanno , Siarhei Meliukh , Yesim Inam
IPC: H02M3/07
Abstract: A dual-stage boost converter is disclosed. The boost converter includes a charge pump and a boost stage. The charge pump is coupled between an input voltage source and the boost stage. The charge pump is coupled to receive the input voltage and configured to generate an intermediate voltage that is greater than the input voltage received from the input voltage source. The boost stage includes an inductor coupled to receive the intermediate voltage and is configured to generate an output voltage that is greater than or equal to the intermediate voltage.
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