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公开(公告)号：US11381172B2
公开(公告)日：2022-07-05
申请号：US17065984
申请日：2020-10-08
Applicant: Apple Inc.
Inventor： Michael Couleur , Nicola Rasera , Siarhei Meliukh
Abstract: A control system with a voltage-to-time converter for combined buck-boost converter using a single inductor. The system includes a voltage-to-time converter circuit having first and second inputs coupled to receive first and second voltage signals, respectively. The voltage-to- time converter includes a comparator configured to compare the first voltage signal and the second voltage signal and to generate a comparator output signal at a first level if the first voltage is greater than the second voltage and at a second level if the second voltage is greater than the first voltage. The voltage-to-time converter further includes an output circuit configured to generate first and second output signals based on the comparator output signal. The output circuit is configured to provide a selected one of the first or second output signals at the first level for a duration dependent on a difference between respective voltages of the first and second voltage signals.
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公开(公告)号：US10804803B1
公开(公告)日：2020-10-13
申请号：US16661913
申请日：2019-10-23
Applicant: Apple Inc.
Inventor： Michael Couleur , Nicola Rasera , Siarhei Meliukh
Abstract: A DC-DC converter that provides both buck and boost voltages using a single inductor is disclosed. The DC-DC converter includes an H-bridge circuit having an inductor having first and second terminals, and a number of switches. The switches include a first switch coupled between the second inductor terminal and a boost voltage node, a second switch coupled between the second inductor terminal and a buck voltage node, and a third switch coupled between the first inductor terminal and an input voltage node. A control circuit is coupled to activate the switches in accordance with a number of different phases such that a buck voltage (e.g., less than the input voltage) is provided on the buck voltage node, while a boost voltage (e.g., greater than the input voltage) is provided on the boost voltage node.
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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：US20240088787A1
公开(公告)日：2024-03-14
申请号：US17931088
申请日：2022-09-09
Applicant: Apple Inc.
Inventor： Michael Couleur , Nicola Rasera , Nikola Jovanovic
IPC: H02M3/158
CPC classification number: H02M3/158
Abstract: A multi-level power converter circuit for computer systems maintains phase alignment with other power converter circuits by employing low-gain phase-locked loop circuits. In order to account for different voltage levels on its terminal nodes, the power converter circuit may perform a comparison of the respective voltage levels of its terminal nodes. Using results of the comparison, the power converter circuit can select different regulation modes using different ones of the low-gain phase-locked loop circuits.
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公开(公告)号：US10707761B1
公开(公告)日：2020-07-07
申请号：US16394823
申请日：2019-04-25
Applicant: Apple Inc.
Inventor： Michael Couleur , Andrea Acquas , Nicola Rasera
Abstract: A power converter circuit included in a computer system may charge and discharge a switch node coupled to a regulated power supply node via an inductor. During a charge cycle, the power converter circuit may generate a reference ramp signal that has an initial voltage level greater than that of the switch node. The power converter may also generate a sense ramp signal using the voltage level of the switch node, and halt the charge cycle using results of a comparison of the respective voltage levels of the reference ramp signal and the sense ramp signal.
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Patent Agency Ranking
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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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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8.发明授权公开(公告)号：US11594967B2
公开(公告)日：2023-02-28
申请号：US17242012
申请日：2021-04-27
Applicant: Apple Inc.
Inventor： Michael Couleur , Nicola Rasera , Nikola Jovanovic , Pietro Gabriele Gambetta
Abstract: A hysteretic current control switching power converter with a clock-controlled switching frequency is disclosed. A power converter includes a switching circuit including a high side switch and a low side switch coupled to one another at a switching node, with an inductor being coupled between the switching node and a regulated supply voltage node. The power converter further includes a control circuit configured to alternately cause activation of the high side switch and the low side switch, wherein the control circuit is configured to activate the low side switch in response to a first voltage reaching peak threshold value, the first voltage corresponding to a current through the inductor. A ramp voltage circuit is configured to, in response to a clock signal, generate a ramp voltage, wherein the peak threshold value is based on the ramp voltage.
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公开(公告)号：US20210247827A1
公开(公告)日：2021-08-12
申请号：US16784605
申请日：2020-02-07
Applicant: Apple Inc.
Inventor： Michael Couleur , Nicola Rasera , Siarhei Meliukh
Abstract: A power converter circuit that includes a switch circuit, and multiple phase and amplifier circuits, may generate a voltage level on a regulated power supply node of a computer system. The amplifier circuits may generate respective demand currents using a voltage level of the regulated power supply node and a reference voltage. In response to activation of a multi-phase operating mode, the switch circuit may short the outputs of the amplifier circuits to generate a common demand current. The multiple phase circuits may sequentially source current to regulated power supply node using the common demand current.
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公开(公告)号：US20210126539A1
公开(公告)日：2021-04-29
申请号：US17065984
申请日：2020-10-08
Applicant: Apple Inc.
Inventor： Michael Couleur , Nicola Rasera , Siarhei Meliukh
IPC: H02M3/158
Abstract: A DC-DC converter that provides both buck and boost voltages using a single inductor is disclosed. The DC-DC converter includes an H-bridge circuit having an inductor having first and second terminals, and a number of switches. The switches include a first switch coupled between the second inductor terminal and a boost voltage node, a second switch coupled between the second inductor terminal and a buck voltage node, and a third switch coupled between the first inductor terminal and an input voltage node. A control circuit is coupled to activate the switches in accordance with a number of different phases such that a buck voltage (e.g., less than the input voltage) is provided on the buck voltage node, while a boost voltage (e.g., greater than the input voltage) is provided on the boost voltage node.
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