-
公开(公告)号：US09887630B2
公开(公告)日：2018-02-06
申请号：US15354705
申请日：2016-11-17
Applicant: Apple Inc.
Inventor： Bogdan T. Bucheru , Zaohong Yang
IPC: H02M3/335
CPC classification number: H02M3/33523 , H02M3/33507 , H02M3/33553 , H02M2001/0025
Abstract: This disclosure describes an AC/DC power converter that produces multiple output voltage levels. The AC/DC power converter may include a gain adjustment circuit. The gain adjustment circuit may adjust the gain of a feedback signal of the converter in accordance with the converter's output voltage level. The gain adjustment circuit provides sufficient gain and phase margins to the converter and thus enhances the converter's stability.
-
公开(公告)号：US20160190948A1
公开(公告)日：2016-06-30
申请号：US14985040
申请日：2015-12-30
Applicant: Apple Inc.
Inventor： Zaohong Yang , Bharatkumar K. Patel , Bogdan T. Bucheru , Juan Carlos Pastrana
IPC: H02M3/335
CPC classification number: H02M3/33592 , H02M1/32 , H02M2001/0032 , H02M2001/0038 , H02M2001/0054 , Y02B70/1475 , Y02B70/1491 , Y02B70/16
Abstract: The disclosed embodiments provide a system that operates a flyback converter. During activation of a synchronous rectifier (SR) controller on a secondary side of the power converter, the system temporarily disables driving of a gate of a metal-oxide-semiconductor field-effect transistor (MOSFET) by the SR controller to enable synchronization of the SR controller to a switching frequency on a primary side of the power converter. After driving of the gate of the MOSFET by the SR controller has been disabled for a pre-specified period, the system enables driving of the gate of the MOSFET by the SR controller.
Abstract translation: 所公开的实施例提供了操作反激转换器的系统。 在功率转换器的次级侧激活同步整流器（SR）控制器期间，系统暂时禁止由SR控制器驱动金属氧化物半导体场效应晶体管（MOSFET）的栅极，以使得能够同步 SR控制器到功率转换器初级侧的开关频率。 在SR控制器驱动MOSFET的栅极已经被禁止预定的时间段之后，该系统能够通过SR控制器驱动MOSFET的栅极。
-
公开(公告)号：US11863084B2
公开(公告)日：2024-01-02
申请号：US17448439
申请日：2021-09-22
Applicant: Apple Inc.
Inventor： Bogdan T. Bucheru
IPC: H02M7/06
CPC classification number: H02M7/06
Abstract: A multi-output AC/DC adapter can include a main power stage that receives power from an AC power source and delivers an intermediate output voltage, a plurality of regulator stages each comprising a chopper circuit that receives the intermediate output voltage and produces a regulated output DC voltage for one of the multiple outputs, and a controller. The main power stage can be a flyback converter, and the intermediate output voltage can be derived from a secondary winding of a flyback transformer of the flyback converter. The controller can provide a voltage reference signal and a feedback signal to the feedback loop of the main power stage, and the feedback signal can be an output voltage of one of the regulator stages. The controller can also provide a voltage reference signal to the controller of each of the regulator stages.
-
公开(公告)号：US20200274438A1
公开(公告)日：2020-08-27
申请号：US16445421
申请日：2019-06-19
Applicant: Apple Inc.
Inventor： Bogdan T. Bucheru , Poornima Mazumdar , Marco A. Davila, JR.
Abstract: A leakage energy steering circuit for a flyback converter can include a leakage energy steering capacitor and a leakage energy steering diode configured to be coupled between a first output terminal and a first secondary winding terminal of a flyback converter. The leakage energy steering circuit can further include a reset circuit having an impedance element and a diode configured to be coupled between a junction of the leakage energy steering capacitor and the leakage energy steering diode and a junction of a second secondary winding terminal and a second output terminal of the flyback converter. The impedance element may be a resistor or an inductor.
-
公开(公告)号：US10742125B1
公开(公告)日：2020-08-11
申请号：US16420965
申请日：2019-05-23
Applicant: Apple Inc.
Inventor： Bogdan T. Bucheru
Abstract: A direct feedback isolated power converter can include a transformer with primary, secondary, and bias windings. A main switch can selectively enable and disable current flow through the primary winding. A controller coupled to the bias winding may be configured to generate a gate drive signal for the main switch responsive at least in part to free ringing of the transformer. The controller may detect the free ringing via the bias winding. An auxiliary switch coupled across the secondary winding may be configured to selectively short circuit the secondary winding, responsive to feedback circuitry, to control when free ringing is established. The feedback circuitry may include a proportional, proportional integral, or proportional-integral-derivative control loop, a hysteretic control loop, or other controller type. The controller may operate at a variable or fixed frequency. The direct feedback isolated power converter may be a flyback converter or other type of isolated converter.
-
Patent Agency Ranking
公开(公告)号：US10396776B2
公开(公告)日：2019-08-27
申请号：US15878020
申请日：2018-01-23
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.
-
公开(公告)号：US20190074692A1
公开(公告)日：2019-03-07
申请号：US15850752
申请日：2017-12-21
Applicant: Apple Inc.
Inventor： Zaohong Yang , Bogdan T. Bucheru
Abstract: Disclosed herein are a system, method and non-transitory program storage device that are intended to provide a control system with quick response for a multi-level power converter. The control system may regulate an output voltage of the power converter based on one or more feedback signals. The feedback signals may be generated based on a differential between the output voltage and a reference voltage. The control system may further include one or more feed-forward signals representative of either the output voltage or transients of the output voltage. The control system may further include one or more switches in parallel with the one or more capacitors to selectively enable and/or disable direct feed-forward and capacitive feed-forward responsive to the output voltage at different levels.
-
公开(公告)号：US20190007040A1
公开(公告)日：2019-01-03
申请号：US15878020
申请日：2018-01-23
Applicant: Apple Inc.
Inventor： Marco A. Davila , Bogdan T. Bucheru
CPC classification number: H03K17/161 , H02M1/08 , H02M3/07 , H02M3/156 , H02M2001/0058 , H03K17/162 , H03K17/165
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.
-
公开(公告)号：US20180205311A1
公开(公告)日：2018-07-19
申请号：US15847008
申请日：2017-12-19
Applicant: Apple Inc.
Inventor： Marco A. Davila , Joao L. Andres , Bogdan T. Bucheru
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.
-
公开(公告)号：US20170346406A1
公开(公告)日：2017-11-30
申请号：US15354705
申请日：2016-11-17
Applicant: Apple Inc.
Inventor： Bogdan T. Bucheru , Zaohong Yang
IPC: H02M3/335
CPC classification number: H02M3/33523 , H02M3/33507 , H02M3/33553 , H02M2001/0025
Abstract: This disclosure describes an AC/DC power converter that produces multiple output voltage levels. The AC/DC power converter may include a gain adjustment circuit. The gain adjustment circuit may adjust the gain of a feedback signal of the converter in accordance with the converter's output voltage level. The gain adjustment circuit provides sufficient gain and phase margins to the converter and thus enhances the converter's stability.
-
-
-
-
-
-
-
-
-
Search Results
31
records
(took 0.029 seconds)
