公开(公告)号：US20190036442A1

公开(公告)日：2019-01-31

申请号：US15718880

申请日：2017-09-28

Applicant: Apple Inc.

Inventor： InHwan Oh

IPC: H02M1/08 ,  H02M1/32 ,  H02M3/335 ,  H02M1/12 ,  H02M1/44

Abstract: A primary resonant flyback converter may include a primary winding, a resonant capacitor in series with the primary winding, a secondary winding magnetically coupled to the primary winding, and an output electrically coupled to the secondary winding. A main switch may be operated to energize the primary winding when closed and transfer energy stored in the primary winding to the secondary winding when open. An auxiliary switch may be configured to switch complimentarily to the main switch, thereby allowing a resonant current to circulate through the primary winding and capacitor. Switch timing may be controlled to produce a desired output voltage. The primary resonant flyback converter may include one or more of: (a) output voltage sensing across the resonant capacitor; (b) a full bridge switch configuration; and (c) lossless current sensing using a current sensing circuit coupled in parallel with the resonant capacitor.

公开(公告)号：US10170974B1

公开(公告)日：2019-01-01

申请号：US15718801

申请日：2017-09-28

Applicant: Apple Inc.

Inventor： InHwan Oh ,  Abby Cherian ,  Manisha Pandya

IPC: H02M1/08 ,  H02M3/335 ,  H02M1/00

Abstract: A primary resonant flyback converter may include a primary winding, a resonant capacitor in series with the primary winding, a secondary winding magnetically coupled to the primary winding, and an output electrically coupled to the secondary winding. A main switch may be operated to energize the primary winding when closed and transfer energy stored in the primary winding to the secondary winding when open. An auxiliary switch may be configured to switch complimentarily to the main switch, thereby allowing a resonant current to circulate through the primary winding and capacitor. Switch timing may be controlled to produce a desired output voltage. The switching frequency may be varied as a function of output load, input voltage and/or voltage ripple on a DC bus of the converter. Switching may also be temporarily disabled responsive to a decrease in output load and re-enabled responsive to an increase in output load.

公开(公告)号：US20160294291A1

公开(公告)日：2016-10-06

申请号：US15182234

申请日：2016-06-14

Applicant: Apple Inc.

Inventor： InHwan Oh ,  Nicholas A. Sims

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

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。

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。

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

IPC: G06F1/26 ,  H02J7/00 ,  H01R13/66

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。

公开(公告)号：US12301118B2

公开(公告)日：2025-05-13

申请号：US17662777

申请日：2022-05-10

Applicant: Apple Inc.

Inventor： InHwan Oh

IPC: H02M3/335 ,  H02M1/00

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：US20210099076A1

公开(公告)日：2021-04-01

申请号：US16586588

申请日：2019-09-27

Applicant: Apple Inc.

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

IPC: H02M1/42 ,  H02M3/335 ,  H02M1/08

Abstract: A power converter can include an input boost converter stage having an input configured to receive a rectified AC input voltage and an output configured to deliver a DC bus voltage and a second switching converter stage having an input configured to receive the DC bus voltage and an output configured to deliver a regulated output voltage. The input boost converter may be configured to be operated in a flat current mode to maintain a substantially constant DC bus voltage over a broad range of AC input voltages. The input boost converter may be further configured to be operated in an active blanking mode, wherein operation of the boost converter is prevented during a controlled blanking interval of each cycle of the rectified AC input voltage. The controlled blanking interval may be increased responsive at least in part to an increase in the AC input voltage and/or may be decreased responsive at least in part to a decrease in the AC input voltage.

公开(公告)号：US10778108B2

公开(公告)日：2020-09-15

申请号：US16410666

申请日：2019-05-13

Applicant: Apple Inc.

Inventor： InHwan Oh

IPC: H02M3/335 ,  H02M7/5387 ,  H02M7/217 ,  H02M1/08 ,  H02M7/06 ,  H02M7/48

Abstract: A frequency doubling resonant converter can include a dual half bridge resonant converter configured to receive an input DC voltage and convert it to an frequency doubled AC voltage having a frequency twice the switching frequency of the dual half bridge resonant converter. The converter can further include a step down transformer configured to reduce the frequency doubled AC voltage to a stepped down AC voltage. The converter can further include a rectifier configured to convert the stepped down AC voltage into a DC output voltage for delivery to a load. The converter may optionally include an interphase transformer coupled between the step down transformer and the rectifier and configured to increase an output current of the converter. The frequency doubling resonant converter may be configured, for example, to double an output current received from the step down transformer.

公开(公告)号：US20190267901A1

公开(公告)日：2019-08-29

申请号：US15974008

申请日：2018-05-08

Applicant: Apple Inc.

Inventor： InHwan Oh

IPC: H02M3/158 ,  H02M3/06 ,  H02J50/12 ,  H02J50/40

Abstract: A forward mode, soft switching, resonant power converter may include a resonant circuit having an input and an output. A main switch may couple the input to a DC input voltage. An auxiliary switch may couple the input to ground. A rectifying component may be coupled between the output of the resonant circuit and an output of the power converter. The main and auxiliary switches may be operated to alternately couple the input terminal to the DC input voltage and ground, thereby converting the DC input voltage to an output voltage of the converter. Resonance may allow for the main and auxiliary switches to be closed under zero voltage switching conditions. The main and auxiliary switches may be operated at a fixed switching frequency, and a duty cycle of the main switch may be increased in response to increased load on the converter.

公开(公告)号：US20190036447A1

公开(公告)日：2019-01-31

申请号：US15718936

申请日：2017-09-28

Applicant: Apple Inc.

Inventor： InHwan Oh ,  Abby Cherian ,  Bharat Patel

IPC: H02M1/42 ,  H02M3/335 ,  H02M1/08

Abstract: A primary resonant flyback converter may include a primary winding, a resonant capacitor in series with the primary winding, a secondary winding magnetically coupled to the primary winding, and an output electrically coupled to the secondary winding. A main switch may be operated to energize the primary winding when closed and transfer energy stored in the primary winding to the secondary winding when open. An auxiliary switch may be configured to switch complimentarily to the main switch, thereby allowing a resonant current to circulate through the primary winding and capacitor. Switch timing may be controlled to produce a desired output voltage. The converter may also include an input inductor that receives an input voltage, presenting an improved power factor to an AC input power source and in conjunction with the switching devices boosts a rectified AC input voltage to a DC voltage bus of the converter.