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公开(公告)号：US09325249B2
公开(公告)日：2016-04-26
申请号：US13802311
申请日：2013-03-13
Applicant: Apple Inc.
Inventor： Bogdan T. Bucheru
CPC classification number: H02M3/3372 , H02M1/4258 , H02M2001/0058 , Y02B70/126 , Y02B70/1433 , Y02B70/1491
Abstract: An AC/DC power converter utilizing a single stage boost-asymmetric LLC topology is disclosed. The converter uses a combined pulse width modulation (PWM) and frequency modulation (FM) to achieve dual control for a single main magnetic element (transformer). The transformer provides an output voltage regulation throughout the primary-secondary isolation operating in resonant mode (LLC) by means of frequency modulation, while at the same time its magnetizing inductance is conditioning the input current and providing a boosted high voltage for energy storage purpose by means of duty cycle control. A single pair of complementary primary switches is used to drive the primary winding of the transformer in order to achieve both voltage regulation and power conditioning. The secondary side capacitors and the resonant inductor, which may be either integrated into the transformer or external to the transformer, achieve the resonant function of the transformer.
Abstract translation: 公开了一种采用单级升压 - 非对称LLC拓扑的AC / DC功率转换器。 转换器使用组合脉宽调制（PWM）和频率调制（FM）来实现单个主磁元件（变压器）的双重控制。 变压器通过频率调制在谐振模式（LLC）中工作的整个次级隔离中提供输出电压调节，同时其磁化电感调节输入电流，并提供用于储能的升压高电压 占空比控制手段 一对互补的初级开关用于驱动变压器的初级绕组，以实现电压调节和功率调节。 可以将二次侧电容器和谐振电感器集成到变压器中或外部变压器，实现变压器的谐振功能。
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公开(公告)号：US20160094145A1
公开(公告)日：2016-03-31
申请号：US14866741
申请日：2015-09-25
Applicant: Apple Inc.
Inventor： InHwan Oh , Bogdan T. Bucheru
IPC: H02M7/217
CPC classification number: H02M3/33523 , H02M2001/0025
Abstract: A power converter controller controls a power stage to produce a regulated voltage at a converter output node, using an input signal. A circuit uses an opto-coupler circuit that has an input node connected to a compensation circuit, to generate the input signal. The compensation circuit has a shunt regulator having an output that is connected to the opto-coupler circuit through series-connected first and second current limiting elements. An input of the shunt regulator is connected to the converter output node. A feedback element has one end connected between the series-connected current limiting elements and another end connected to the input of the regulator. Other embodiments are also described and claimed.
Abstract translation: 功率转换器控制器使用输入信号控制功率级以在转换器输出节点产生调节电压。 电路使用具有连接到补偿电路的输入节点的光耦合器电路，以产生输入信号。 补偿电路具有分流调节器，其具有通过串联连接的第一和第二限流元件连接到光耦合器电路的输出。 分流调节器的输入端连接到转换器输出节点。 反馈元件的一端连接在串联连接的限流元件和连接到调节器的输入端的另一端之间。 还描述和要求保护其他实施例。
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公开(公告)号：US20160091940A1
公开(公告)日：2016-03-31
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
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.
Abstract translation: 电子设备具有连接在I / O端口和总线连接器的通信接点之间的I / O端口，总线连接器和晶体管。 控制电路连接到晶体管以保持晶体管的栅极电压，而不依赖于连接器的电源触点上的电源电压。 还描述和要求保护其他实施例。
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公开(公告)号：US11527958B2
公开(公告)日：2022-12-13
申请号：US17025738
申请日：2020-09-18
Applicant: Apple Inc.
Inventor： Bogdan T. Bucheru
IPC: H02M3/158 , G01R19/175 , G01R19/165 , H02M1/00
Abstract: A power converter can include a magnetic energy storage element, a main switch, a synchronous rectifier switch, and an energy recovery circuit. The energy recovery circuit can include a resonant circuit and an auxiliary switch configured to operate in conjunction with the main and synchronous rectifier switches to store energy in the resonant circuit and deliver energy therefrom to reduce switching losses associated with the main and synchronous rectifier switches. The converter can be a buck, boost, buck-boost, or other converter type. The auxiliary switch may be operated according to a two-pulse control mode or using a conventional buck converter controller with additional delay elements. The resonant circuit inductance may be a discrete inductor or a parasitic inductance, such as a PCB trace, which may be designed to provide a desired inductance value selected to efficiently provide sufficient energy to achieve reduced switching losses of the main and auxiliary switches.
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公开(公告)号：US20210384833A1
公开(公告)日：2021-12-09
申请号：US17025738
申请日：2020-09-18
Applicant: Apple Inc.
Inventor： Bogdan T. Bucheru
IPC: H02M3/158 , G01R19/175 , G01R19/165
Abstract: A power converter can include a magnetic energy storage element, a main switch, a synchronous rectifier switch, and an energy recovery circuit. The energy recovery circuit can include a resonant circuit and an auxiliary switch configured to operate in conjunction with the main and synchronous rectifier switches to store energy in the resonant circuit and deliver energy therefrom to reduce switching losses associated with the main and synchronous rectifier switches. The converter can be a buck, boost, buck-boost, or other converter type. The auxiliary switch may be operated according to a two-pulse control mode or using a conventional buck converter controller with additional delay elements. The resonant circuit inductance may be a discrete inductor or a parasitic inductance, such as a PCB trace, which may be designed to provide a desired inductance value selected to efficiently provide sufficient energy to achieve reduced switching losses of the main and auxiliary switches.
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Patent Agency Ranking
公开(公告)号：US10770965B2
公开(公告)日：2020-09-08
申请号：US16365100
申请日：2019-03-26
Applicant: Apple Inc.
Inventor： Marco A. Davila , Joao L. Andres , Bogdan T. Bucheru , Vijay Phadke
Abstract: This disclosure describes a flyback converter with a series-parallel mode (SPM) active clamp. The active clamp, coupled in parallel with the primary coil, may include a clamp switch, two or more snubber capacitors, and associated diodes. The active clamp may be configured to absorb and retain the leakage energy from the leakage inductance of the flyback converter. The clamp switch may be turned on selectively as the primary switch approaches one of a plurality peak values to adjust frequencies of the switching devices. With the active clamp circuit, the flyback converter may first re-capture the leakage energy in the active clamp circuit and then recover it back to the power source.
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公开(公告)号：US09774266B2
公开(公告)日：2017-09-26
申请号：US14866741
申请日：2015-09-25
Applicant: Apple Inc.
Inventor： InHwan Oh , Bogdan T. Bucheru
CPC classification number: H02M3/33523 , H02M2001/0025
Abstract: A power converter controller controls a power stage to produce a regulated voltage at a converter output node, using an input signal. A circuit uses an opto-coupler circuit that has an input node connected to a compensation circuit, to generate the input signal. The compensation circuit has a shunt regulator having an output that is connected to the opto-coupler circuit through series-connected first and second current limiting elements. An input of the shunt regulator is connected to the converter output node. A feedback element has one end connected between the series-connected current limiting elements and another end connected to the input of the regulator. Other embodiments are also described and claimed.
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公开(公告)号：US12026317B2
公开(公告)日：2024-07-02
申请号：US17477286
申请日：2021-09-16
Applicant: Apple Inc.
Inventor： Bogdan T. Bucheru
IPC: G06F3/01 , G01F1/66 , G01N29/024 , G01N29/34 , G01N29/36 , G01N29/44 , G06F1/16 , G06F3/0346 , G06F3/041 , G06F3/043 , G06F3/04883 , G01N29/22 , G01N29/27
CPC classification number: G06F3/017 , G01F1/662 , G01N29/024 , G01N29/341 , G01N29/36 , G01N29/4409 , G06F1/1616 , G06F3/0346 , G06F3/0416 , G06F3/043 , G06F3/04883 , G01N29/223 , G01N29/27 , G01N29/44 , G06F3/0412 , G06F3/04166
Abstract: An electronic device includes air input sensors that gather air input from a user's fingers, a stylus, or other object in a volume of air near the electronic device. The air input sensors include ultrasonic transducers that emit ultrasonic signals towards the volume of air and that detect the ultrasonic signals after the signals reflect from the external object. Using time-of-flight measurement techniques, control circuitry tracks the movement of the external object in the volume of air near the electronic device. A display provides visual feedback of the air input, such as shadows that preview where the input will be directed to on the display. The volume of air where input is detected is divided into multiple input zones that trigger different actions from the electronic device. The ultrasonic transducers include acoustic lenses.
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公开(公告)号：US10985748B2
公开(公告)日：2021-04-20
申请号：US16545748
申请日：2019-08-20
Applicant: Apple Inc.
Inventor： Marco A. Davila , Bogdan T. Bucheru
Abstract: This disclosure describes a gate driver with voltage boosting capabilities. In some embodiments, the gate driver may comprise a charge pump that includes capacitor(s) and switch(es). Responsive a logic low input signal, the gate driver may bypass the capacitor(s) to allow the input digital signal to drive the gating signal directly. Conversely, responsive to a logic high input signal, the gate driver may couple the capacitor(s) in series with the input digital signal to generate a boosted gating signal. In some embodiments, the gate driver may comprise an inductor-capacitor resonant circuit to create a doubled output gating signal with respect to the input digital signal. In some embodiments, the resonant gate driver may include an additional voltage boosting capability that can be selectively enabled to compensate for a voltage drop during the signal transfer from the input to the output.
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公开(公告)号：US10855192B1
公开(公告)日：2020-12-01
申请号：US16538963
申请日：2019-08-13
Applicant: Apple Inc.
Inventor： Zaohong Yang , Marco A. Davila, Jr. , Joao L. Andres , Poornima Mazumdar , Bogdan T. Bucheru
Abstract: A transformer-based switching power converter can include a slew rate limiter coupled to the switching stage and configured to limit rate of change of voltage across one or more switching devices of the switching stage, thereby reducing voltage spikes appearing on the secondary winding. The slew rate limiter may be configured to selectively operate to limit rate of change of voltage across one or more switching devices of the switching stage during startup of the switching stage, upon waking from burst mode, or at any time when zero voltage switching of the one or more switching devices is unavailable. The slew rate limiter can include at least one circuit element configured to selectively alter a time constant of a gate drive circuit of at least one switching device in the switching stage to increase a turn-on transition time of the at least one switching device.
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