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公开(公告)号：US11817790B2
公开(公告)日：2023-11-14
申请号：US17375954
申请日：2021-07-14
发明人： Guang Feng , Pengju Kong , Xiyuan Liu , Qingqing Zong
CPC分类号： H02M3/33592 , H02M1/44
摘要： A flyback converter is provided that includes a high-side synchronous rectifier switch transistor. A secondary-side synchronous rectifier controller powered by a power supply voltage controls a cycling on and off of the high-side synchronous rectifier switch transistor. An active control of the charging of the power supply voltage uses an auxiliary capacitor that is charged from a charge source while a power switch transistor in a first switching state. When the power switch transistor is in a second switching state that is the complement of the first switching state, the active control coupes the auxiliary capacitor to a power supply capacitor that stores the power supply voltage.
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公开(公告)号：US11728736B2
公开(公告)日：2023-08-15
申请号：US17211773
申请日：2021-03-24
发明人： Pengju Kong , Tao Li , Jiaji Qi , Zhi Yang , Jianming Yao
CPC分类号： H02M3/33523 , H02M1/0048 , H02M3/33584 , H02M3/33592
摘要： A flyback converter includes a synchronous rectifier switch transistor controlled by a controller. The controller cycles the synchronous rectifier switch transistor to lower an output voltage by transferring energy from a secondary-side output capacitor to a primary-side input capacitor.
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公开(公告)号：US11621646B2
公开(公告)日：2023-04-04
申请号：US17151028
申请日：2021-01-15
发明人： Qingqing Zong , Yimin Chen , Mengfei Liu , Pengju Kong
摘要： A flyback converter is provided that dynamically adjusts a drain threshold voltage for a current cycle of a synchronous rectifier switch transistor based upon operating conditions in a previous cycle of the synchronous rectifier switch transistor. A differential amplifier drives a gate voltage of the synchronous rectifier switch transistor during an on-time of the current cycle so that a drain voltage of the synchronous rectifier switch transistor equals the drain threshold voltage during a regulated portion of the current cycle.
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公开(公告)号：US20230056711A1
公开(公告)日：2023-02-23
申请号：US17445719
申请日：2021-08-23
发明人： Xiaoyong ZHANG
摘要： An active-clamp flyback converter is provided with improved active-clamp switch control that switches on an active-clamp switch at an active-clamp switch on-time that equals a power switch on-time minus a peak charge time for an active-clamp capacitor. The peak charge time is the duration between the switching off of the power switch transistor and when the charging current through the active-clamp capacitor falls to zero. The controller measures this peak charge time following the switching off of the power switch transistor and then applies it to the subsequent switching on of the active-clamp switch so that the active-clamp switch is switched on at the power switch on-time minus the peak charge time.
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公开(公告)号：US11588409B2
公开(公告)日：2023-02-21
申请号：US17064533
申请日：2020-10-06
发明人： Wenduo Liu , Kun Yang , Laiqing Ping
摘要： A flyback converter communication channel is provided that comprises a pair of capacitors. A transmitter on a first side of a transformer for the flyback converter transmits a transmitter signal over a first one of the capacitors. The transmitter also transmits a complement of the transmitter signal over a second one of the capacitors. A receiver on a second side of the transformer controls a switch transistor responsive to a high-pass-filtered difference of the received signals from the pair of capacitors.
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公开(公告)号：US11309801B2
公开(公告)日：2022-04-19
申请号：US16903138
申请日：2020-06-16
发明人： Pengju Kong , Tao Li , Juyoung Yoon
摘要： A secondary-side control loop for a flyback converter is provided that generates a secondary-side control signal during normal operation using a compensator. In periods of significant load changes, the compensator is bypassed so that the secondary-side control signal is generated as an open-loop signal.
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公开(公告)号：US11234318B2
公开(公告)日：2022-01-25
申请号：US16880721
申请日：2020-05-21
发明人： Wenduo Liu , Kun Yang
IPC分类号： H05B47/18 , H05B45/37 , H05B45/395 , H04L29/08
摘要： A DALI interface is provided that includes a digital isolator having an input terminal and an output terminal. A DALI bus controlled by a master device controls a binary voltage state of a voltage rail. A DFET couples between the input terminal and the output terminal to control a voltage of the input terminal responsive to the control of the DALI bus by the master device. The digital isolator responds to the control of the input terminal voltage to drive a digital signal through an isolation barrier to control a voltage of the output terminal to control a slave lighting device.
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公开(公告)号：US11223283B2
公开(公告)日：2022-01-11
申请号：US16853575
申请日：2020-04-20
发明人： Cong Zheng , Wenduo Liu , Hien Bui
摘要： Disclosed is a universal primary-only output current regulation for a flyback converter. A controller determines a peak sense resistor voltage responsive to a desired average output current for the flyback converter during a continuous conduction mode of operation. After a power switch transistor is cycled on, the controller monitors a sense resistor voltage to determine when the sense resistor voltage equals the peak sense resistor voltage. The controller switches off the power switch transistor when the sense resistor voltage equals the peak sense resistor voltage to maintain an average output current for the flyback converter equal to the desired average output current.
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公开(公告)号：US20210328517A1
公开(公告)日：2021-10-21
申请号：US16853575
申请日：2020-04-20
发明人： Cong ZHENG , Wenduo LIU , Hien BUI
摘要： Disclosed is a universal primary-only output current regulation for a flyback converter. A controller determines a peak sense resistor voltage responsive to a desired average output current for the flyback converter during a continuous conduction mode of operation. After a power switch transistor is cycled on, the controller monitors a sense resistor voltage to determine when the sense resistor voltage equals the peak sense resistor voltage. The controller switches off the power switch transistor when the sense resistor voltage equals the peak sense resistor voltage to maintain an average output current for the flyback converter equal to the desired average output current.
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公开(公告)号：US11075584B2
公开(公告)日：2021-07-27
申请号：US15809682
申请日：2017-11-10
发明人： Jun Zheng , Jianming Yao , Yimin Chen , Huaming Guo , Zhaowu Luo
摘要： A switch detection circuit is provided that senses the voltage on a rectifying component for rectifying a secondary winding current through a secondary winding of a flyback converter's transformer to determine whether a power switch transistor attached to a primary winding of the transformer has ceased cycling.
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