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公开(公告)号：US11736030B2
公开(公告)日：2023-08-22
申请号：US17514176
申请日：2021-10-29
发明人： Qiao Zhang , Xinlei Li
CPC分类号： H02M3/33592 , H02M3/1588 , H02M3/158
摘要： A synchronous rectification control circuit for controlling a switching circuit comprising a synchronous rectifier switch, can include: a drive circuit configured to generate a drive signal to control switching states of the synchronous rectifier switch; and a voltage regulation circuit configured to control the drive circuit to adjust an amplitude of the drive signal to decrease to a preset threshold in an adjustment state when a drain-source voltage of the synchronous rectifier switch is greater than an adjustment threshold before the synchronous rectifier switch is turned off, where a time that the voltage regulation circuit is in the adjustment state is an adjustment time.
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公开(公告)号：US11190108B2
公开(公告)日：2021-11-30
申请号：US16711607
申请日：2019-12-12
发明人： Qiao Zhang , Xinlei Li
摘要： A synchronous rectification control circuit for controlling a switching circuit comprising a synchronous rectifier switch, can include: a drive circuit configured to generate a drive signal to control switching states of the synchronous rectifier switch; and a voltage regulation circuit configured to control the drive circuit to adjust an amplitude of the drive signal to decrease to a preset threshold in an adjustment state when a drain-source voltage of the synchronous rectifier switch is greater than an adjustment threshold before the synchronous rectifier switch is turned off, where a time that the voltage regulation circuit is in the adjustment state is an adjustment time.
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公开(公告)号：US20210006172A1
公开(公告)日：2021-01-07
申请号：US16910258
申请日：2020-06-24
发明人： Zhiliang Hu , Qiukai Huang , Xinlei Li , Yongjiang Bai
摘要： A switching control circuit for a flyback converter having a main switch coupled to a primary winding of a transformer and a rectifier switch coupled to a secondary winding of the transformer, can include: a first voltage generating circuit configured to generate a first voltage sampling signal representing information of an input voltage; a synchronous rectification control circuit configured to adjust an on-time of the rectifier switch according to the first voltage sampling signal in order to adjust an absolute value of a negative current flowing through the secondary winding; and where the negative current is configured to discharge a parasitic capacitor of the main switch in order to reduce a drain-source voltage of the main switch.
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公开(公告)号：US11799386B2
公开(公告)日：2023-10-24
申请号：US17370156
申请日：2021-07-08
发明人： Qiao Zhang , Xinlei Li
IPC分类号： H02M3/335
CPC分类号： H02M3/33592
摘要： An isolated power converter can include: a primary side having a primary winding and a primary power transistor; a secondary side having a secondary winding and a secondary power transistor; a secondary control circuit configured to change a voltage across the secondary winding to change a voltage across the primary winding during a period when both the primary power transistor and the secondary power transistor are in a turn-off state; and a primary control circuit configured to control switching states of the primary power transistor, such that an output signal of the isolated power converter matches an output demand.
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公开(公告)号：US11038423B2
公开(公告)日：2021-06-15
申请号：US16675452
申请日：2019-11-06
摘要： A frequency control circuit, applied in a switching converter, can be configured to: regulate an off time of a power transistor of the switching converter in one switching cycle according to an on time of the power transistor, or regulate the on time of the power transistor in one switching cycle according to the off time of the power transistor; and maintain an operating frequency of the switching converter to be within a predetermined range.
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公开(公告)号：US20200076307A1
公开(公告)日：2020-03-05
申请号：US16675452
申请日：2019-11-06
摘要： A frequency control circuit, applied in a switching converter, can be configured to: regulate an off time of a power transistor of the switching converter in one switching cycle according to an on time of the power transistor, or regulate the on time of the power transistor in one switching cycle according to the off time of the power transistor; and maintain an operating frequency of the switching converter to be within a predetermined range.
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公开(公告)号：US20170047848A1
公开(公告)日：2017-02-16
申请号：US15224745
申请日：2016-08-01
发明人： Qiukai Huang , Xinlei Li , Zhiliang Hu , Chaopeng Jin
CPC分类号： H02M3/33507 , H01F38/42 , H02M1/44
摘要： A flyback converter can include: a power switch controlled to be turned on/off to control a current through a primary side; a first primary winding coupled between an input terminal and a first terminal of the power switch, where a dotted terminal of the first primary winding is coupled to a first terminal of the power switch; a second primary winding coupled between a second terminal of the power switch and a primary grounding terminal, where a dotted terminal of the second primary winding is coupled to the primary grounding terminal; a secondary winding configured between the first and second primary windings in a radial direction of a magnetic core, where the first primary winding, the second primary winding, and the secondary winding are wound around the magnetic core; and a secondary rectifier and filter circuit coupled with the secondary winding, and configured to generate a stable current/voltage.
摘要翻译： 反激转换器可以包括：被控制为开/关以控制通过初级侧的电流的功率开关; 耦合在所述电源开关的输入端子和第一端子之间的第一初级绕组，其中所述第一初级绕组的虚线端子耦合到所述电源开关的第一端子; 耦合在所述电源开关的第二端子与主接地端子之间的第二初级绕组，其中所述第二初级绕组的虚线端子耦合到所述主接地端子; 第一初级绕组，第二初级绕组和次级绕组缠绕在磁芯上的次级绕组，其在第一和第二初级绕组之间沿磁芯的径向方向配置; 以及与次级绕组耦合的次级整流器和滤波器电路，并且被配置为产生稳定的电流/电压。
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公开(公告)号：US20220038017A1
公开(公告)日：2022-02-03
申请号：US17370156
申请日：2021-07-08
发明人： Qiao Zhang , Xinlei Li
IPC分类号： H02M3/335
摘要： An isolated power converter can include: a primary side having a primary winding and a primary power transistor; a secondary side having a secondary winding and a secondary power transistor; a secondary control circuit configured to change a voltage across the secondary winding to change a voltage across the primary winding during a period when both the primary power transistor and the secondary power transistor are in a turn-off state; and a primary control circuit configured to control switching states of the primary power transistor, such that an output signal of the isolated power converter matches an output demand.
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公开(公告)号：US09473034B2
公开(公告)日：2016-10-18
申请号：US14600996
申请日：2015-01-20
发明人： Qiukai Huang , Zhiliang Hu , Xinlei Li
CPC分类号： H02M3/33523 , H02M2001/0006 , H02M2001/0009 , H02M2001/348
摘要： Disclosed are an isolated power converter and a switching control signal using the same. In the isolated power converter, the positions of the power switch and the primary winding are exchanged, and the feedback voltage detection and secondary current zero-crossing detection are carried out in accordance with the voltage across the primary winding. Thus, primary side control can still be implemented without employment of an auxiliary winding.
摘要翻译： 公开了一种隔离电力转换器和使用其的开关控制信号。 在隔离电力转换器中，交换电源开关和初级绕组的位置，根据初级绕组两端的电压进行反馈电压检测和二次电流过零检测。 因此，在不使用辅助绕组的情况下，仍然可以实现初级侧控制。
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公开(公告)号：US11424687B2
公开(公告)日：2022-08-23
申请号：US16910258
申请日：2020-06-24
发明人： Zhiliang Hu , Qiukai Huang , Xinlei Li , Yongjiang Bai
摘要： A switching control circuit for a flyback converter having a main switch coupled to a primary winding of a transformer and a rectifier switch coupled to a secondary winding of the transformer, can include: a first voltage generating circuit configured to generate a first voltage sampling signal representing information of an input voltage; a synchronous rectification control circuit configured to adjust an on-time of the rectifier switch according to the first voltage sampling signal in order to adjust an absolute value of a negative current flowing through the secondary winding; and where the negative current is configured to discharge a parasitic capacitor of the main switch in order to reduce a drain-source voltage of the main switch.
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