公开(公告)号：US10917006B1

公开(公告)日：2021-02-09

申请号：US16671387

申请日：2019-11-01

Applicant: Apple Inc.

Inventor： InHwan Oh ,  Bharat K. Patel ,  Abby Cherian

IPC: H02M1/42 ,  G05F1/70 ,  H02M7/217 ,  G05F1/565 ,  H02M7/219 ,  H02M1/08 ,  H02M7/06 ,  H02M1/44

Abstract: A power converter can be configured to convert an AC input voltage into a regulated DC output voltage while maintaining the input current in phase with the rectified AC input voltage. A control circuit of the power converter may be configured to selectively enable switching of at least one switching device of the power converter responsive to a determination that the input voltage is greater than a threshold voltage and to selectively disable switching of the at least one switching device responsive to a determination that the rectified AC input voltage is less than the threshold voltage. The control circuit may be configured to selectively enable and disable switching using an active burst mode signal having a frequency lower than a switching frequency of the converter. The control circuit may be still further configured to operate at least one switching device of the converter in a zero voltage switching condition.

公开(公告)号：US10742118B2

公开(公告)日：2020-08-11

申请号：US15386340

申请日：2016-12-21

Applicant: Apple Inc.

Inventor： InHwan Oh

IPC: H02M3/156 ,  H02M1/14 ,  H02M1/00

Abstract: A power converter includes a current-monitoring on-state controller that is configured to adjust the timing of a switch-mode voltage conversion stage of the power converter. For example, the timing of the turn-on of a MOSFET associated with a buck converter operated in a discontinuous conduction mode (e.g., quasi-resonant) can be adjusted based on a zero crossing of current through a tank inductor also associated with the buck converter. More particularly, the MOSFET may be turned on after a predetermined delay is initiated after current through the tank inductor reaches zero. The predetermined delay is based on a resonance period defined by the characteristic capacitance of the MOSFET and the inductance of the tank inductor.

公开(公告)号：US20190097458A1

公开(公告)日：2019-03-28

申请号：US15847116

申请日：2017-12-19

Applicant: Apple Inc.

Inventor： InHwan Oh ,  Bharat Patel

IPC: H02J50/12 ,  H01F38/14 ,  H02M7/06 ,  H02M7/217

Abstract: A wireless power transfer circuit can include an interphase transformer operatively coupled to a receiver coil, a rectifier, and a load. The receiver coil can be configured to have an alternating current induced therein by a transmitter coil. The interphase transformer can be configured to deliver a current to the load that is twice the current induced in the receiver coil, and the rectifier can be configured to rectify the current delivered to the load. The interphase transformer may be constructed with a center tapped winding structure or a bifilar winding structure, and may be constructed as a planar transformer. The rectifier may be made up of diodes (which may be Schottky diodes) or may be a synchronous rectifier comprised of switching devices such as MOSFETs.

公开(公告)号：US20140140113A1

公开(公告)日：2014-05-22

申请号：US13680970

申请日：2012-11-19

Applicant: APPLE INC.

Inventor： InHwan Oh

IPC: H02M7/217

CPC classification number: H02M7/217 ,  H02M1/14 ,  H02M1/4241 ,  H02M2007/4818 ,  Y02B70/126 ,  Y02B70/1441

Abstract: The disclosed embodiments provide an AC/DC power converter that converts an AC input voltage into a DC output voltage. This AC/DC power converter includes an input rectifier stage which rectifies an AC input voltage into a first rectified voltage of a first constant polarity and a first amplitude. The AC/DC power converter also includes a switching resonant stage which is directly coupled to the output of the input rectifier stage. This switching resonant stage converts the rectified voltage into a second rectified voltage of a second constant polarity and a second amplitude. The AC/DC power converter additionally includes an output rectifier stage coupled to the output of the switching resonant stage, wherein the output rectifier stage rectifies the second rectified voltage into a DC voltage output.

Abstract translation: 所公开的实施例提供将AC输入电压转换为DC输出电压的AC / DC功率转换器。 该AC / DC功率转换器包括将AC输入电压整流为第一恒定极性和第一幅度的第一整流电压的输入整流级。 AC / DC功率转换器还包括直接耦合到输入整流级的输出的开关谐振级。 该开关谐振级将整流电压转换为第二恒定极性和第二幅度的第二整流电压。 AC / DC功率转换器还包括耦合到开关谐振级的输出的输出整流器级，其中输出整流器级将第二整流电压整流为DC电压输出。

公开(公告)号：US20230275516A1

公开(公告)日：2023-08-31

申请号：US17662777

申请日：2022-05-10

Applicant: Apple Inc.

Inventor： InHwan Oh

IPC: H02M3/335 ,  H02M1/00

CPC classification number: H02M3/33571 ,  H02M1/0058

Abstract: A power converter can include a half bridge comprising a high side auxiliary switch and a low side main switch, the half bridge having an input coupled to a DC voltage source, a series resonant circuit coupled to the output of the half bridge, the series resonant circuit comprising a resonant capacitor and a primary winding of a transformer, an output coupled to a secondary winding of the transformer by a rectifier, the output delivering a regulated output voltage to a load, and control circuitry that operates the main switch and the auxiliary switch substantially complementarily as a forward converter with zero voltage switching of the main and auxiliary switches to regulate the output voltage delivered to the load.

公开(公告)号：US20180083490A1

公开(公告)日：2018-03-22

申请号：US15711182

申请日：2017-09-21

Applicant: Apple Inc.

Inventor： InHwan Oh ,  Manisha P. Pandya ,  Abby Cherlan ,  Bharat K. Patel

IPC: H02J50/12 ,  H04B5/00 ,  H02J5/00

CPC classification number: H02J50/12 ,  H02J5/005 ,  H04B5/0037 ,  H04B5/0093

Abstract: A power converter can be implemented as a series of power conversion stages, including a wireless power conversion stage. In typical embodiments, the power converter receives power directly from mains voltage and outputs power to a battery within an electronic device. A transmitter side of the power converter converts alternating current received from a power source (e.g., mains voltage) to an alternating current suitable for applying to a primary coil of the wireless power conversion stage of the power converter.

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

IPC: H02M3/335 ,  H02M1/00

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.

公开(公告)号：US09768700B2

公开(公告)日：2017-09-19

申请号：US15182234

申请日：2016-06-14

Applicant: Apple Inc.

Inventor： InHwan Oh ,  Nicholas A. Sims

IPC: H02M3/335 ,  H02M1/42 ,  H02M7/217 ,  H02M1/08 ,  H02M1/14 ,  H02M1/44

CPC classification number: H02M3/33507 ,  H02M1/08 ,  H02M1/14 ,  H02M1/4241 ,  H02M1/4258 ,  H02M1/44 ,  H02M7/217 ,  Y02B70/126 ,  Y02B70/1441

Abstract: The disclosed embodiments provide an AC/DC power converter that converts an AC input voltage into a DC output voltage. This AC/DC power converter includes an input rectifier stage which rectifies an AC input voltage into a first rectified voltage. The AC/DC power converter also includes a switching resonant stage which is directly coupled to the output of the input rectifier stage. The switching resonant stage converts the rectified voltage into a first high frequency AC voltage of a first amplitude. This AC/DC power converter additionally includes a transformer which is coupled to the output of the switching resonant stage and is configured to down-convert the first high frequency AC voltage into a second high frequency AC voltage of a second amplitude. Furthermore, the AC/DC power converter includes an output rectifier stage which is coupled to the output of the transformer, wherein the output rectifier stage rectifies the second high frequency AC voltage into a DC output voltage.

公开(公告)号：US09001539B2

公开(公告)日：2015-04-07

申请号：US13680970

申请日：2012-11-19

Applicant: Apple Inc.

Inventor： InHwan Oh

IPC: H02M5/45 ,  H02M7/217 ,  H02M1/42 ,  H02M1/14 ,  H02M7/48

CPC classification number: H02M7/217 ,  H02M1/14 ,  H02M1/4241 ,  H02M2007/4818 ,  Y02B70/126 ,  Y02B70/1441

Abstract: The disclosed embodiments provide an AC/DC power converter that converts an AC input voltage into a DC output voltage. This AC/DC power converter includes an input rectifier stage which rectifies an AC input voltage into a first rectified voltage of a first constant polarity and a first amplitude. The AC/DC power converter also includes a switching resonant stage which is directly coupled to the output of the input rectifier stage. This switching resonant stage converts the rectified voltage into a second rectified voltage of a second constant polarity and a second amplitude. The AC/DC power converter additionally includes an output rectifier stage coupled to the output of the switching resonant stage, wherein the output rectifier stage rectifies the second rectified voltage into a DC voltage output.

Abstract translation: 所公开的实施例提供将AC输入电压转换为DC输出电压的AC / DC功率转换器。 该AC / DC功率转换器包括将AC输入电压整流为第一恒定极性和第一幅度的第一整流电压的输入整流级。 AC / DC功率转换器还包括直接耦合到输入整流级的输出的开关谐振级。 该开关谐振级将整流电压转换为第二恒定极性和第二幅度的第二整流电压。 AC / DC功率转换器还包括耦合到开关谐振级的输出的输出整流器级，其中输出整流器级将第二整流电压整流为DC电压输出。

公开(公告)号：US20140160805A1

公开(公告)日：2014-06-12

申请号：US13720811

申请日：2012-12-19

Applicant: APPLE INC.

Inventor： InHwan Oh ,  Nicholas A. Sims

IPC: H02M3/335

CPC classification number: H02M3/33507 ,  H02M1/08 ,  H02M1/14 ,  H02M1/4241 ,  H02M1/4258 ,  H02M1/44 ,  H02M7/217 ,  Y02B70/126 ,  Y02B70/1441

Abstract: The disclosed embodiments provide an AC/DC power converter that converts an AC input voltage into a DC output voltage. This AC/DC power converter includes an input rectifier stage which rectifies an AC input voltage into a first rectified voltage. The AC/DC power converter also includes a switching resonant stage which is directly coupled to the output of the input rectifier stage. The switching resonant stage converts the rectified voltage into a first high frequency AC voltage of a first amplitude. This AC/DC power converter additionally includes a transformer which is coupled to the output of the switching resonant stage and is configured to down-convert the first high frequency AC voltage into a second high frequency AC voltage of a second amplitude. Furthermore, the AC/DC power converter includes an output rectifier stage which is coupled to the output of the transformer, wherein the output rectifier stage rectifies the second high frequency AC voltage into a DC output voltage.

Abstract translation: 所公开的实施例提供将AC输入电压转换为DC输出电压的AC / DC功率转换器。 该AC / DC电力转换器包括将AC输入电压整流为第一整流电压的输入整流级。 AC / DC功率转换器还包括直接耦合到输入整流级的输出的开关谐振级。 开关谐振级将整流电压转换为第一幅度的第一高频AC电压。 该AC / DC功率转换器还包括耦合到开关谐振级的输出的变压器，并且被配置为将第一高频AC电压下变频为第二幅度的第二高频AC电压。 此外，AC / DC功率转换器包括耦合到变压器的输出的输出整流器级，其中输出整流器级将第二高频AC电压整流为DC输出电压。