公开(公告)号：US10148178B2

公开(公告)日：2018-12-04

申请号：US15646035

申请日：2017-07-10

Applicant: Apple Inc.

Inventor： InHwan Oh ,  Manisha P. Pandya ,  Behzad Mohtashemi

IPC: H02M3/158 ,  H02M1/08 ,  H02M1/00

Abstract: A power converter includes a buck converter with a low-side switch. During a discharge mode, current passes through the low-side switch to form a current loop. The low-side switch is typically closed synchronously with the opening of a high-side switch coupled to an input voltage level to the buck converter. The power converter also includes a high-side controller and a low-side controller, which together are configured to adjust the timing of the operation mode of the high-side controller between a storage mode and the discharge mode.

公开(公告)号：US09977475B2

公开(公告)日：2018-05-22

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: H02H3/20 ,  H02H9/04 ,  G06F1/26

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.

公开(公告)号：US20180041116A1

公开(公告)日：2018-02-08

申请号：US15386340

申请日：2016-12-21

Applicant: Apple Inc.

Inventor： InHwan Oh

IPC: H02M3/156 ,  H02M1/08 ,  H02M1/14 ,  H02M7/06

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：US20180041073A1

公开(公告)日：2018-02-08

申请号：US15387329

申请日：2016-12-21

Applicant: Apple Inc.

Inventor： InHwan Oh

IPC: H02J50/12 ,  H02M7/06 ,  H02M3/158

CPC classification number: H02M3/156 ,  H02M2001/0025

Abstract: A variable-output power converter includes a switch-mode voltage conversion stage operating in a peak-current control mode. For example, the timing of the turn-off of a MOSFET associated with a buck converter can be adjusted based on a measurement of current conducted through the by MOSFET. When the current through the MOSFET exceeds a threshold, the MOSFET is turned off, thereby defining the peak current that can be output by the variable-output power converter. The peak-current threshold can be adjusted by changing one or more characteristics of a compensation network configured to provide positive feedback to the variable-output power converter. In many examples, the peak-current threshold is adjusted using a pulse-width modulated signal.

公开(公告)号：US09391524B2

公开(公告)日：2016-07-12

申请号：US13720811

申请日：2012-12-19

Applicant: Apple Inc.

Inventor： InHwan Oh ,  Nicholas A. Sims

IPC: H02M3/335 ,  H02M1/42 ,  H02M7/217

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。