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1. 发明授权

US09685874B2 Circuit and method for evaluation overload condition in flyback converter 有权
公开(公告)号：US09685874B2
公开(公告)日：2017-06-20
申请号：US14788340
申请日：2015-06-30
申请人： Alpha and Omega Semiconductor (Cayman) Ltd.
发明人： Yu-Ming Chen , Jung-Pei Cheng , Pei-Lun Huang
IPC分类号： G01R31/02 , H02M3/335 , H02M1/32 , H02M1/00 , G01R31/40 , G01R19/165
CPC分类号： H02M3/33507 , G01R19/16538 , G01R31/40 , H02M1/32 , H02M2001/0009
摘要： A circuit and a method for evaluating a load condition in a flyback converter are disclosed. A first current source is used for providing a preset current ISUM equal to a sum of the off current value IOFF and the blanking current value ILEB to charge a first capacitor, and a second current source is used for providing a reference current IREF to charge a second capacitor. A comparator receives a voltage applied on the first capacitor at its positive input end and a voltage applied on the second capacitor at its negative input end. The output current transmitted to the load by the flyback converter is varied to the change of the preset current ISUM, as such the load condition is detected by the comparison result generated by the comparator.

2. 发明申请

US20170047853A1 FLYBACK CONVERTER OUTPUT CURRENT EVALUATION CIRCUIT AND EVALUATION METHOD 有权
标题翻译： FLYBACK转换器输出电流评估电路和评估方法
公开(公告)号：US20170047853A1
公开(公告)日：2017-02-16
申请号：US15343091
申请日：2016-11-03
申请人： Alpha and Omega Semiconductor (Cayman) Ltd.
发明人： Yu-Ming Chen , Jung-Pei Cheng , Pei-Lun Huang
IPC分类号： H02M3/335 , G01R19/10 , G01R19/25 , H02M1/08
CPC分类号： H02M3/33515 , G01R19/10 , G01R19/15 , G01R19/25 , H02M1/08 , H02M3/33507 , H02M2001/0009
摘要： An output current calculating circuit for a flyback converter operating under CCM and DCM is disclosed. The off current value IOFF and the blanking current value ILEB flowing through a sensing resistor are calculated using a detection module and are summed together using a current summing unit. A voltage converted from the sum value of the off current value IOFF and the blanking current value ILEB is transmitted through an output stage in a predetermined time ratio of a cycle with the duty cycle determined by a logic control unit, in which the logic control unit controls the output stage to receive the voltage converted from sum current in a predetermined time period of each cycle, and prevents the output stage to receive the voltage converted from sum current in the remaining time other than such predetermined time period of each cycle.
摘要翻译：公开了一种用于在CCM和DCM下工作的反激式转换器的输出电流计算电路。使用检测模块计算流过感测电阻器的截止电流值IOFF和消隐电流值ILEB，并使用电流求和单元求和。从关断电流值IOFF和消隐电流值ILEB的和值转换的电压以由具有由逻辑控制单元确定的占空比的周期的预定时间比率传输通过输出级，其中逻辑控制单元控制输出级以在每个周期的预定时间段内接收从和电流转换的电压，并且防止输出级在除了每个周期的这样的预定时间段之外的剩余时间中接收从和电流转换的电压。

3. 发明申请

US20190207528A1 CONSTANT ON-TIME (COT) CONTROL IN ISOLATED CONVERTER 审中-公开
公开(公告)号：US20190207528A1
公开(公告)日：2019-07-04
申请号：US16298787
申请日：2019-03-11
申请人： Alpha and Omega Semiconductor (Cayman) Ltd.
发明人： Tien-Chi Lin , Chih-Yuan Liu , Yung-Chuan Hsu , Pei-Lun Huang
IPC分类号： H02M3/335 , H02M1/40 , H02M1/08
CPC分类号： H02M3/33592 , H02M1/08 , H02M1/36 , H02M1/40 , H02M3/33523 , Y02B70/1475
摘要： A constant on-time isolated converter comprises a transformer with a primary side and a secondary side. The primary side is connected to an electronic switch and secondary-side is connected to a load and a processor. The processor is connected to a driver on primary side through at least one coupling element and to the electronic switch. The processor receives an output voltage or an output current across the load generating a control signal accordingly. The driver receives the control signal through the coupling element and accordingly changes the ON/OFF state of the electronic switch, regulating the output voltage and the output current via the transformer, where the duration of the ON/OFF state of the electronic switch is determined between the moment control signal changes from negative to positive and the moment it changes from positive to negative to achieve a high-speed load transient response.

4. 发明授权

US10298144B2 Voltage detection circuit and a method of detecting voltage changes 有权
公开(公告)号：US10298144B2
公开(公告)日：2019-05-21
申请号：US15348110
申请日：2016-11-10
申请人： Alpha and Omega Semiconductor (Cayman) Ltd.
发明人： Yu-Ming Chen , Chih-Yuan Liu , Pei-Lun Huang
IPC分类号： H02M7/217 , H02M1/32 , G01R19/22 , G01R15/16 , G01R19/165 , H02M7/06 , G01R19/15 , H02M1/42 , H02M7/04 , G01R19/155 , G01R19/145
摘要： A power conversion system and a method for voltage change detection, specifically, relates to a detection circuit implemented in the AC-DC power converter, detect the voltage change. The AC input voltage is rectified to convert into a DC input voltage transmitted to a detection unit generating a detection voltage signal at different logical states corresponding to the input voltage changes. A charge current source unit is used for charging the capacitor when the detection voltage signal is in a second state and a discharge current source unit is used for discharging the capacitor when the detection voltage signal is in a first state. A primary comparator compares the voltage changes of the capacitor in the alternating charge and discharge processes with a critical zero potential and outputs a detection signal identifying the changing trend of the input voltage.

5. 发明授权

US09664714B2 Methods and devices for detecting the input voltage and discharging the residuevoltage 有权
公开(公告)号：US09664714B2
公开(公告)日：2017-05-30
申请号：US14670918
申请日：2015-03-27
申请人： Alpha and Omega Semiconductor (Cayman) Ltd.
发明人： Yu-Ming Chen , Chih-Yuan Liu , Pei-Lun Huang
IPC分类号： G01R19/00 , G01R19/22 , H02M7/04 , H02M1/32
CPC分类号： G01R19/22 , G01R19/0007 , H02M1/32 , H02M2001/322
摘要： The present invention relates to power conversion systems, specifically, it relates to a device for detecting the DC voltage rectified from the AC power supply voltage in an AC-DC converter, primarily used to determine whether the DC input voltage is under a brown-out level and to monitor whether the AC power supply is removed and to discharge the residue DC voltage generated in a high frequency filter capacitor, which is used to filter high frequency noise signals of the AC power supply, during the removal of the AC power.

6. 发明授权

US09490712B2 Flyback converter output current evaluation circuit and evaluation method 有权
标题翻译：反激式转换器输出电流评估电路及评估方法
公开(公告)号：US09490712B2
公开(公告)日：2016-11-08
申请号：US14755951
申请日：2015-06-30
申请人： Alpha and Omega Semiconductor (Cayman) Ltd.
发明人： Yu-Ming Chen , Jung-Pei Cheng , Pei-Lun Huang
IPC分类号： H02M3/335 , G01R19/10 , G01R19/15
CPC分类号： H02M3/33515 , G01R19/10 , G01R19/15 , G01R19/25 , H02M1/08 , H02M3/33507 , H02M2001/0009
摘要： An output current calculating circuit for a flyback converter operating under CCM and DCM is disclosed. The off current value ION and the blanking current value ILEB flowing through a sensing resistor are calculated using a detection module and are summed together using a current summing unit. A voltage converted from the sum value of the off current value IOFF and the blanking current value ILEB is transmitted through an output stage in a predetermined time ratio of a cycle with the duty cycle determined by a logic control unit, in which the logic control unit controls the output stage to receive the voltage converted from sum current in a predetermined time period of each cycle, and prevents the output stage to receive the voltage converted from sum current in the remaining time other than such predetermined time period of each cycle.
摘要翻译：公开了一种用于在CCM和DCM下工作的反激式转换器的输出电流计算电路。使用检测模块计算流过感测电阻器的截止电流值ION和消隐电流值ILEB，并使用电流求和单元将其相加。从关断电流值IOFF和消隐电流值ILEB的和值转换的电压以由具有由逻辑控制单元确定的占空比的周期的预定时间比率传输通过输出级，其中逻辑控制单元控制输出级以在每个周期的预定时间段内接收从和电流转换的电压，并且防止输出级在除了每个周期的这样的预定时间段之外的剩余时间中接收从和电流转换的电压。

7. 发明申请

US20160178671A1 CIRCUIT AND METHOD FOR EVALUATION OVERLOAD CONDITION IN FLYBACK CONVERTER 有权
标题翻译：用于评估变频器过载条件的电路和方法
公开(公告)号：US20160178671A1
公开(公告)日：2016-06-23
申请号：US14788340
申请日：2015-06-30
申请人： Alpha and Omega Semiconductor (Cayman) Ltd.
发明人： Yu-Ming Chen , Jung-Pei Cheng , Pei-Lun Huang
IPC分类号： G01R19/165 , G01R31/00 , H02M3/335
CPC分类号： H02M3/33507 , G01R19/16538 , G01R31/40 , H02M1/32 , H02M2001/0009
摘要： A circuit and a method for evaluating a load condition in a flyback converter are disclosed. A first current source is used for providing a preset current ISUM equal to a sum of the off current value IOFF and the blanking current value ILEB to charge a first capacitor, and a second current source is used for providing a reference current IREF to charge a second capacitor. A comparator receives a voltage applied on the first capacitor at its positive input end and a voltage applied on the second capacitor at its negative input end. The output current transmitted to the load by the flyback converter is varied to the change of the preset current ISUM, as such the load condition is detected by the comparison result generated by the comparator.
摘要翻译：公开了一种用于评估反激式转换器中的负载状况的电路和方法。第一电流源用于提供等于关断电流值IOFF和消隐电流值ILEB之和的预设电流ISUM以对第一电容器充电，并且第二电流源用于提供参考电流IREF以对第二电容器。比较器在其正输入端接收施加在第一电容器上的电压，并在其负输入端接收施加在第二电容器上的电压。由反激式转换器传输到负载的输出电流根据预设电流ISUM的变化而变化，因此通过比较器产生的比较结果来检测负载条件。

8. 发明申请

US20160079878A1 CONSTANT ON TIME (COT) CONTROL IN ISOLATED CONVERTER 有权
标题翻译：恒定时间（COT）控制在隔离转换器
公开(公告)号：US20160079878A1
公开(公告)日：2016-03-17
申请号：US14562735
申请日：2014-12-07
申请人： Alpha and Omega Semiconductor (Cayman) Ltd.
发明人： Tien-Chi Lin , Chih-Yuan Liu , Yueh-Ping Yu , Pei-Lun Huang
IPC分类号： H02M3/335
CPC分类号： H02M3/33592 , H02M3/33507 , Y02B70/1475
摘要： The present invention discloses a constant on-time isolated converter comprising a transformer with a primary side and a secondary side. The primary side is connected to an electronic switch and secondary-side is connected to a load and a processor. The processor is connected to a driver on primary side through at least one coupling element and to the electronic switch. The processor receives an output voltage or an output current across the load generating a control signal accordingly. The driver receives the control signal through the coupling element and accordingly changes the ON/OFF state of the electronic switch, regulating the output voltage and the output current via the transformer, where the duration of the ON/OFF state of the electronic switch is determined between the moment control signal changes from negative to positive and the moment it changes from positive to negative to achieve a high-speed load transient response.
摘要翻译：本发明公开了一种具有初级侧和次级侧的变压器的恒定导通时间隔离变换器。初级侧连接到电子开关，次级侧连接到负载和处理器。处理器通过至少一个耦合元件和电子开关连接到初级侧的驱动器。处理器接收负载的输出电压或输出电流，从而产生相应的控制信号。驱动器通过耦合元件接收控制信号，从而改变电子开关的ON / OFF状态，通过变压器调节输出电压和输出电流，确定电子开关的ON / OFF状态瞬间控制信号从负变为正，瞬间从正变为负，达到高速负载瞬态响应。

9. 发明申请

US20160079876A1 CONSTANT ON-TIME (COT) CONTROL IN ISOLATED CONVERTER 有权
公开(公告)号：US20160079876A1
公开(公告)日：2016-03-17
申请号：US14562731
申请日：2014-12-07
申请人： Alpha and Omega Semiconductor (Cayman) Ltd.
发明人： Tien-Chi Lin , Chih-Yuan Liu , Yung-Chuan Hsu , Pei-Lun Huang
IPC分类号： H02M3/335
CPC分类号： H02M3/33592 , H02M1/14 , H02M3/33507 , H02M3/33576 , Y02B70/1475
摘要： The present invention discloses a constant on-time isolated converter comprising a transformer with a primary side and a secondary side. The primary side is connected to an electronic switch and secondary-side is connected to a load and a processor. The processor is connected to a driver on primary side through at least one coupling element and to the electronic switch. The processor receives an output voltage or an output current across the load generating a control signal accordingly. The driver receives the control signal through the coupling element and accordingly changes the ON/OFF state of the electronic switch, regulating the output voltage and the output current via the transformer, where the duration of the ON/OFF state of the electronic switch is determined between the moment control signal changes from negative to positive and the moment it changes from positive to negative to achieve a high-speed load transient response.

10. 发明授权

US11127520B2 Pulse transformer 有权
公开(公告)号：US11127520B2
公开(公告)日：2021-09-21
申请号：US16153309
申请日：2018-10-05
申请人： Alpha and Omega Semiconductor (Cayman) Ltd.
发明人： Tien-Chi Lin , Yu-Ming Chen , Jung-Pei Cheng , Pei-Lun Huang
IPC分类号： H01F5/00 , H01F27/28 , H01F27/06 , H01F27/02 , H01F27/32 , H01F27/24 , H01F27/29 , H02M3/335 , H02M1/08 , H02M1/40 , H02M1/36 , H02M1/00
摘要： A voltage converter comprises a second controller as a power switch of the secondary side of the transformer for comparing a detection voltage representing an output voltage and/or load current with a first reference voltage and generating a control signal, and a coupling element for transmitting the control signal generated by the second controller to the first controller on the primary side of the transformer enabling the first controller to generate a first pulse signal driving the power switch to control the on/off state of the primary side winding.

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