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公开(公告)号：US20240105377A1
公开(公告)日：2024-03-28
申请号：US18368661
申请日：2023-09-15
CPC分类号： H01F27/24 , H01F27/2823
摘要： A magnetic structure can include: a first magnetic component and a second magnetic component; two magnetic columns configured to form a magnetic flux loop with at least part of the first magnetic component and at least part of the second magnetic component, where at least one of the two magnetic columns is wound with one or more windings; and where the at least part of the first magnetic component is located between the two magnetic columns.
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2.发明公开公开(公告)号：US20230155502A1
公开(公告)日：2023-05-18
申请号：US17975778
申请日：2022-10-28
CPC分类号： H02M3/158 , H02M3/07 , H02M3/01 , H02M3/33569 , H02M7/04
摘要： A multilevel self-balance control circuit can include: a voltage divider unit configured to receive and divide an input voltage; a voltage-controlled charge source load coupled to an output terminal of the voltage divider unit, and being configured to adaptively adjust charge amount input to the voltage-controlled charge source load based on an output voltage of the voltage divider unit, such that a total amount of charges flowing through the voltage-controlled charge source load during a period of each working state of the voltage divider unit is positively correlated with the output voltage of the voltage divider unit, thereby forming a negative feedback loop to achieve voltage balancing of the voltage divider unit; and a control unit configured to generate control signals for the voltage divider unit and the voltage-controlled charge source load, thereby coordinately controlling the voltage divider unit and the voltage-controlled charge source load.
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公开(公告)号：US20210226545A1
公开(公告)日：2021-07-22
申请号：US17148779
申请日：2021-01-14
IPC分类号： H02M3/335 , G01R19/165 , H05B45/382 , H03K5/24
摘要： A power converter can include an input circuit having a primary winding and a primary power switch coupled in series between an input terminal and the ground; a first output circuit having a first secondary winding which is coupled with the primary winding; a second output circuit having a second secondary winding coupled with the primary winding and at least one secondary power switch; a first control circuit that controls the primary power switch to be turned on and off to adjust an output signal of the first output circuit; and a second control circuit which controls the secondary power switch to be turned on and off to adjust an output signal of the second output circuit. The secondary power switch can be turned on before the primary power switch is turned off in a first state in one switching cycle, in order to reduce the switching interference.
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公开(公告)号：US10468975B2
公开(公告)日：2019-11-05
申请号：US16020365
申请日：2018-06-27
发明人： Xiangdong Yang , Yongjiang Bai , Zhiliang Hu , Wei Chen
摘要： An active clamp control circuit for a flyback converter can be configured to: control turn-on states of a main switch and an auxiliary switch to make the auxiliary switch turn on for a first time period in at least one switching period, and to make the main switch turn on for a second time period in each switching period, where the first and second time periods are non-overlapping periods of the switching period; and compare a peak value of an inductor current flowing through the main switch against a first threshold to adjust the first time period of the auxiliary switch when the peak value of the inductor current is greater than or equal to the first threshold, such that the first time period is directly proportional to the peak value of the inductor current.
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公开(公告)号：US10333351B2
公开(公告)日：2019-06-25
申请号：US15211073
申请日：2016-07-15
发明人： Wang Zhang , Wei Chen , Chen Zhao
IPC分类号： H02J50/12 , H02J7/02 , H02M7/5387 , H02M7/5395 , H02M1/00
摘要： The present disclosure relates to a driving circuit and a wireless power transmitter including the same. N+1 half-bridge circuits constitute N full-bridge circuits by reusing the half-bridge circuits, so as to drive a plurality of coils for wirelessly charging a plurality of loads.
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公开(公告)号：US10193450B2
公开(公告)日：2019-01-29
申请号：US15088331
申请日：2016-04-01
发明人： Wei Chen
摘要： Disclosed are AC-DC voltage converter circuits and methods for low standby power consumption. In one embodiment, a method can include: (i) detecting operating states of an input power supply, where the input power supply is received by a safety capacitor and provided to a switching power supply circuit after being rectified and filtered; (ii) removing a phantom load when the input power supply operates in a normal operating state; (iii) loading the phantom load when the input power supply operates in an under voltage lock out state; and (iv) when the input power supply operates in the under voltage lock out state, using energy stored in the safety capacitor to supply power to a load of the switching power supply circuit and the phantom load, and disabling a power stage circuit until a voltage of the safety capacitor is reduced to less than a safety threshold value.
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公开(公告)号：US09756688B2
公开(公告)日：2017-09-05
申请号：US14742868
申请日：2015-06-18
发明人： Wei Chen
CPC分类号： H05B33/0815 , H05B33/0842 , H05B33/0848 , H05B33/0887 , H05B37/02
摘要： The present invention relates to a high efficiency, high power factor LED driver for driving an LED device. In one embodiment, an LED driver can include: an LED current detection circuit coupled to the LED device, and configured to generate a feedback signal that represents an error between a driving current and an expected driving current of the LED device; a power stage circuit, where a first power switch terminal is coupled to a first input voltage, and a second power switch terminal is coupled to ground; and a control circuit configured to generate a control signal according to the feedback signal and a drain-source voltage of the power switch, where the control signal, in each switch period, turns on the power switch when the drain-source voltage reaches a low level, and turns off the power switch after a fixed time interval based on the feedback signal.
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公开(公告)号：US20170155330A1
公开(公告)日：2017-06-01
申请号：US15429508
申请日：2017-02-10
发明人： Huiqiang Chen , Yunlong Han , Xiaoru Xu , Wei Chen
IPC分类号： H02M3/335
CPC分类号： H02M3/33507 , H02M3/33523 , H03K17/04213
摘要： In one embodiment, a method of controlling a switching power supply, can include: (i) generating a driving current signal that follows a waveform of a sense voltage signal, where the sense voltage signal is related to a current through a collector of a transistor that is configured as a power switch of the switching power supply, where the collector is coupled to an inductive element of the switching power supply; (ii) providing the driving current signal to a base of the transistor, where the transistor is in a saturated conduction state when a pulse-width modulation (PWM) signal is active; and (iii) releasing charge accumulated on the base when the PWM signal is inactive to turn off the transistor.
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公开(公告)号：US09641084B2
公开(公告)日：2017-05-02
申请号：US14598396
申请日：2015-01-16
发明人： Huiqiang Chen , Yunlong Han , Xiaoru Xu , Wei Chen
IPC分类号： H02M3/335 , H03K17/042
CPC分类号： H02M3/33507 , H02M3/33523 , H03K17/04213
摘要： In one embodiment, a method of controlling a switching power supply, can include: (i) generating a driving current signal that follows a waveform of a sense voltage signal, where the sense voltage signal is related to a current through a collector of a transistor that is configured as a power switch of the switching power supply, where the collector is coupled to an inductive element of the switching power supply; (ii) providing the driving current signal to a base of the transistor, where the transistor is in a saturated conduction state when a pulse-width modulation (PWM) signal is active; and (iii) releasing charge accumulated on the base when the PWM signal is inactive to turn off the transistor.
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公开(公告)号：US09621068B2
公开(公告)日：2017-04-11
申请号：US14879237
申请日：2015-10-09
发明人： Wei Chen
CPC分类号： H02M7/06 , H02M1/32 , H02M7/217 , H02M2001/0009 , H05B33/0815 , Y02B20/42
摘要： In one embodiment, a method of driving a load can include: monitoring an AC input to a rectifier circuit in real-time, where the rectifier circuit can include first and second rectifier circuits, and controlling first and second controllable switches based on a state of the AC input is in a first state. For example, a first state can include the AC input being in a positive half cycle and increasing, or the AC input being in the positive half cycle and decreasing while being at least as high as a predetermined threshold value. The AC input can be used to supply power to a load circuit and an output capacitor via the first rectifier circuit when the AC input is in the first state, where the first rectifier circuit can include a first diode and the second controllable switch.
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