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公开(公告)号：US11646581B2
公开(公告)日：2023-05-09
申请号：US17191115
申请日：2021-03-03
发明人： Gwanbon Koo , Youngbae Park , BongGeun Chung
CPC分类号： H02J3/1821 , H01H9/541 , H02J7/0045 , H02J2207/20 , H02M1/0048 , H02M3/33576 , H02M3/33592
摘要： Multi-port power adapters. At least one example is a method including: supplying a first bus voltage to a first device by way of a DC-DC converter coupled to a link voltage; supplying a second bus voltage to a second device by way of a second DC-DC converter coupled to the link voltage; converting an AC voltage to the link voltage by way of an AC-DC converter; selecting, by a shunt regulator, a setpoint for the link voltage based on the first bus voltage and the second bus voltage; and regulating the link voltage to the setpoint by the AC-DC converter.
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公开(公告)号：US10958179B2
公开(公告)日：2021-03-23
申请号：US16823505
申请日：2020-03-19
发明人： Gwanbon Koo , Youngbae Park , Taesung Kim , BongGeun Chung
摘要： Reduced voltage switching of a main switch in flyback power converters. Example embodiments are methods including: driving a primary current with a first polarity in a primary winding of a transformer, and a secondary winding of the transformer arranged for flyback operation; creating, by the primary current, a charge voltage on an auxiliary winding of the transformer; charging, by the charge voltage, a capacitance coupled to the auxiliary winding; ceasing the driving of the primary current and discharging an energy in a field associated with the secondary winding to provide an output voltage of the power converter; inducing a primary current with a second polarity in the primary winding by coupling the capacitance to the auxiliary winding; and reducing voltage across a main switch coupled to the primary winding, the reducing by the primary current with the second polarity.
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公开(公告)号：US10790753B2
公开(公告)日：2020-09-29
申请号：US16128324
申请日：2018-09-11
发明人： Gwanbon Koo , Youngbae Park , Taesung Kim , BongGeun Chung
摘要： Reduced voltage switching of a main switch in flyback power converters. At least some example embodiments are methods including: storing energy in a field associated with a secondary winding of a transformer, the secondary winding arranged for flyback operation within a secondary circuit of the power converter; charging a capacitor coupled to an auxiliary winding of the transformer; discharging the energy in the field associated with the secondary winding to provide an output voltage of the power converter; and when the electrical current flowing through the secondary winding reaches a predetermined low level reducing voltage across a main switch in a primary circuit of the power converter by coupling the capacitor to the auxiliary winding to create a voltage on a primary winding of the transformer.
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公开(公告)号：US10298137B2
公开(公告)日：2019-05-21
申请号：US15711112
申请日：2017-09-21
发明人： Chien-Tsun Hsu , Li Lin , Youngbae Park
摘要： A method for frequency reduction of a quasi-resonant (QR) converter includes detecting a valley point of a resonant waveform of the QR converter, by detecting a voltage level of the resonant waveform falling below a first threshold voltage. A blanking time is formed from the beginning of a QR conversion cycle to the valley point. The blanking time is extended in response to a first reduction of an output loading of the QR converter, while maintaining a primary current of the QR converter at a first current level. The primary current is reduced to a second current level being less than the first current level, while maintaining the blanking time at a maximum blanking time, in response to a second reduction of the output loading.
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公开(公告)号：US20200220465A1
公开(公告)日：2020-07-09
申请号：US16823505
申请日：2020-03-19
发明人： Gwanbon Koo , Youngbae Park , Taesung Kim , BongGeun Chung
IPC分类号： H02M3/335
摘要： Reduced voltage switching of a main switch in flyback power converters. Example embodiments are methods including: driving a primary current with a first polarity in a primary winding of a transformer, and a secondary winding of the transformer arranged for flyback operation; creating, by the primary current, a charge voltage on an auxiliary winding of the transformer; charging, by the charge voltage, a capacitance coupled to the auxiliary winding; ceasing the driving of the primary current and discharging an energy in a field associated with the secondary winding to provide an output voltage of the power converter; inducing a primary current with a second polarity in the primary winding by coupling the capacitance to the auxiliary winding; and reducing voltage across a main switch coupled to the primary winding, the reducing by the primary current with the second polarity.
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公开(公告)号：US10574146B2
公开(公告)日：2020-02-25
申请号：US16021922
申请日：2018-06-28
发明人： Gwanbon Koo , Youngbae Park
摘要： A converter and a driving method thereof are disclosed. The converter includes a transformer, a main switch, a clamp switch, and a switching controller. Here, the switching controller controls a turn-on time of the main switch and a turn-off time of the clamp switch corresponding to an output load.
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公开(公告)号：US10374585B2
公开(公告)日：2019-08-06
申请号：US16279610
申请日：2019-02-19
发明人： Taesung Kim , Seunguk Yang , Youngbae Park
摘要： A signal calculator includes a capacitor and a variable current source. The variable current source charges the capacitor and generates a current corresponding to a predetermined voltage during a first period. A first voltage is generated using a voltage of the capacitor charged during an enable period of a first signal in the first period, and a second voltage is generated using a voltage of the capacitor charged during the first period. The variable current source further generates a current corresponding to the second voltage during a second period. A second signal is generated according to a result of comparing the first voltage with the voltage of the capacitor during the second period, and a fourth voltage is generated by generating and sampling a third voltage which is increased according to a first current during an enable period of the second signal in the second period.
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