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1. 发明授权

US07974107B2 System and method for controlling a current limit with primary side sensing using a hybrid PWM and PFM control 有权
标题翻译：使用混合PWM和PFM控制来控制初级侧感测的电流限制的系统和方法
公开(公告)号：US07974107B2
公开(公告)日：2011-07-05
申请号：US12199471
申请日：2008-08-27
申请人： Yong Li , Junjie Zheng , Liang Yan , John Kesterson , Xiao Yan Wang
发明人： Yong Li , Junjie Zheng , Liang Yan , John Kesterson , Xiao Yan Wang
IPC分类号： H02M3/335
CPC分类号： H02M3/33523
摘要： A hybrid constant current control system that uses both pulse width modulation (PWM) and pulse frequency modulation (PFM) control. When transitioning from constant voltage mode to constant current mode the present invention can continue to control using PWM. Thereafter, when the voltage has dropped, the present invention smoothly transitions to PFM mode. The point of transition is based upon the switching frequency and the lowest rated voltage of operation. The system and method avoids very short (narrow) Ton times which ensures accurate constant current (CC) control with bipolar junction transistor (BJT) devices. The present invention also avoids acoustic noise because the switching frequency is maintained at a high enough level to avoid such acoustic noise even when the energy transferred through the transformer is still substantial and the output voltage is not too low. In addition the output current limit is insensitive to variation in the inductance-input voltage ratio, and is minimized against leakage inductance.
摘要翻译：一种采用脉宽调制（PWM）和脉冲频率调制（PFM）控制的混合恒流控制系统。当从恒定电压模式转换到恒定电流模式时，本发明可以使用PWM继续控制。此后，当电压下降时，本发明平滑地转变为PFM模式。转换点基于开关频率和最低额定工作电压。该系统和方法避免了非常短（窄）的Ton次，从而确保使用双极结型晶体管（BJT）器件进行精确的恒定电流（CC）控制。本发明还避免了声学噪声，因为即使当通过变压器传送的能量仍然很大并且输出电压不是太低时，开关频率被保持在足够高的水平以避免这种声学噪声。此外，输出电流限制对电感 - 输入电压比的变化不敏感，并且对漏电感最小化。

2. 发明申请

US20090059632A1 System And Method For Controlling A Current Limit With Primary Side Sensing Using A Hybrid PWM and PFM Control 有权
标题翻译：使用混合PWM和PFM控制的初级侧检测来控制电流限制的系统和方法
公开(公告)号：US20090059632A1
公开(公告)日：2009-03-05
申请号：US12199471
申请日：2008-08-27
申请人： Yong Li , Junjie Zheng , Liang Yan , John Kesterson , Xiao Yan Wang
发明人： Yong Li , Junjie Zheng , Liang Yan , John Kesterson , Xiao Yan Wang
IPC分类号： H02M7/155
CPC分类号： H02M3/33523
摘要： A hybrid constant current control system that uses both pulse width modulation (PWM) and pulse frequency modulation (PFM) control. When transitioning from constant voltage mode to constant current mode the present invention can continue to control using PWM. Thereafter, when the voltage has dropped, the present invention smoothly transitions to PFM mode. The point of transition is based upon the switching frequency and the lowest rated voltage of operation. The system and method avoids very short (narrow) Ton times which ensures accurate constant current (CC) control with bipolar junction transistor (BJT) devices. The present invention also avoids acoustic noise because the switching frequency is maintained at a high enough level to avoid such acoustic noise even when the energy transferred through the transformer is still substantial and the output voltage is not too low. In addition the output current limit is insensitive to variation in the inductance-input voltage ratio, and is minimized against leakage inductance.
摘要翻译：一种采用脉宽调制（PWM）和脉冲频率调制（PFM）控制的混合恒流控制系统。当从恒定电压模式转换到恒定电流模式时，本发明可以使用PWM继续控制。此后，当电压下降时，本发明平滑地转变为PFM模式。转换点基于开关频率和最低额定工作电压。该系统和方法避免了非常短（窄）的Ton次，从而确保使用双极结型晶体管（BJT）器件进行精确的恒定电流（CC）控制。本发明还避免了声学噪声，因为即使当通过变压器传送的能量仍然很大并且输出电压不是太低时，开关频率被保持在足够高的水平以避免这种声学噪声。此外，输出电流限制对电感 - 输入电压比的变化不敏感，并且对漏电感最小化。

3. 发明申请

US20100164455A1 ADAPTIVE MULTI-MODE DIGITAL CONTROL IMPROVING LIGHT-LOAD EFFICIENCY IN SWITCHING POWER CONVERTERS 有权
标题翻译：自适应多模数字控制提高开关电源转换器的光负载效率
公开(公告)号：US20100164455A1
公开(公告)日：2010-07-01
申请号：US12608854
申请日：2009-10-29
申请人： Yong Li , Carrie Seim , Junjie Zheng , John W. Kesterson , Liang Yan , Clarita Poon , Fuqiang Shi
发明人： Yong Li , Carrie Seim , Junjie Zheng , John W. Kesterson , Liang Yan , Clarita Poon , Fuqiang Shi
IPC分类号： G05F1/10
CPC分类号： H02M3/157 , H02M2001/0032 , Y02B70/16
摘要： Adaptive multi-mode digital control schemes that improve the light-load efficiency (and thus the overall average efficiency) in switch-mode power converters without causing performance issues such as audible noises or excessive voltage ripples. Embodiments include a switch-mode power converter that reduces current in the power converter using a second pulse-width-modulation (PWM) mode before reaching switching frequencies that generate audible noises. As the load across the output of the power converter is reduced, the power converter transitions from a first PWM mode in high load conditions to a first pulse-frequency-modulation (PFM) mode, then to a second PWM mode, and finally to a second PFM mode. During the second PFM mode, the switching frequency is dropped to audible frequency levels. Current in the power converter, however, is reduced in the second PWM mode before transitioning to the second PFM mode. Therefore, the power converter produces less or no audible noise in light load conditions where the switching frequency drops to audible frequency levels, while achieving high efficiency across varying load conditions.
摘要翻译：自适应多模数字控制方案，可以提高开关模式电源转换器的轻负载效率（从而提高整体平均效率），而不会引起诸如声音噪声或电压波动过大等性能问题。实施例包括开关模式功率转换器，其在达到产生可听见噪声的开关频率之前，使用第二脉冲宽度调制（PWM）模式减小功率转换器中的电流。随着功率转换器输出端的负载减小，功率转换器从高负载条件下的第一个PWM模式转换到第一个脉冲频率调制（PFM）模式，然后转换到第二个PWM模式，最后到第二PFM模式。在第二个PFM模式下，开关频率下降到可听频率水平。然而，在转换到第二PFM模式之前，功率转换器中的电流在第二PWM模式中减小。因此，功率转换器在轻负载条件下产生较少或没有可听见的噪声，其中开关频率下降到可听频率水平，同时在不同的负载条件下实现高效率。

4. 发明授权

US08049481B2 Adaptive multi-mode digital control improving light-load efficiency in switching power converters 有权
标题翻译：自适应多模数字控制提高了开关电源转换器的轻载效率
公开(公告)号：US08049481B2
公开(公告)日：2011-11-01
申请号：US12608854
申请日：2009-10-29
申请人： Yong Li , Carrie Seim , Junjie Zheng , John W. Kesterson , Liang Yan , Clarita Poon , Fuqiang Shi
发明人： Yong Li , Carrie Seim , Junjie Zheng , John W. Kesterson , Liang Yan , Clarita Poon , Fuqiang Shi
IPC分类号： G05F1/575 , H02M3/335
CPC分类号： H02M3/157 , H02M2001/0032 , Y02B70/16
摘要： Adaptive multi-mode digital control schemes that improve the light-load efficiency (and thus the overall average efficiency) in switch-mode power converters without causing performance issues such as audible noises or excessive voltage ripples. Embodiments include a switch-mode power converter that reduces current in the power converter using a second pulse-width-modulation (PWM) mode before reaching switching frequencies that generate audible noises. As the load across the output of the power converter is reduced, the power converter transitions from a first PWM mode in high load conditions to a first pulse-frequency-modulation (PFM) mode, then to a second PWM mode, and finally to a second PFM mode. During the second PFM mode, the switching frequency is dropped to audible frequency levels. Current in the power converter, however, is reduced in the second PWM mode before transitioning to the second PFM mode. Therefore, the power converter produces less or no audible noise in light load conditions where the switching frequency drops to audible frequency levels, while achieving high efficiency across varying load conditions.
摘要翻译：自适应多模数字控制方案，可以提高开关模式电源转换器的轻负载效率（从而提高整体平均效率），而不会引起诸如声音噪声或电压波动过大等性能问题。实施例包括开关模式功率转换器，其在达到产生可听见噪声的开关频率之前，使用第二脉冲宽度调制（PWM）模式减小功率转换器中的电流。随着功率转换器输出端的负载减小，功率转换器从高负载条件下的第一个PWM模式转换到第一个脉冲频率调制（PFM）模式，然后转换到第二个PWM模式，最后到第二PFM模式。在第二个PFM模式下，开关频率下降到可听频率水平。然而，在转换到第二PFM模式之前，功率转换器中的电流在第二PWM模式中减小。因此，功率转换器在轻负载条件下产生较少或没有可听见的噪声，其中开关频率下降到可听频率水平，同时在不同的负载条件下实现高效率。

5. 发明申请

US20100202165A1 Dynamic Drive of Switching Transistor of Switching Power Converter 有权
标题翻译：开关电源转换器开关晶体管的动态驱动
公开(公告)号：US20100202165A1
公开(公告)日：2010-08-12
申请号：US12678690
申请日：2007-09-28
申请人： Junjie Zheng , Jun Zheng , Andrew Kwok-Cheung Lee , John William Kesterson , Allan Ming-Lun Lin , Hien Huu Bui , Carrie Seim , Yong Li
发明人： Junjie Zheng , Jun Zheng , Andrew Kwok-Cheung Lee , John William Kesterson , Allan Ming-Lun Lin , Hien Huu Bui , Carrie Seim , Yong Li
IPC分类号： H02M3/335
CPC分类号： H02M3/33507 , H02M2001/0032 , H03K17/163 , H03K17/166 , Y02B70/16
摘要： A switching power converter comprises a transformer (110), a switch (108) coupled to the transformer (110), and a switch controller (200) coupled to the switch (108) for generating a switch drive signal (207) to turn on or off the switch (108). The drive current of the switch drive signal (207) is adjusted dynamically according to line or load conditions within a switching cycle and/or over a plurality of switching cycles. The magnitude of the drive current can be dynamically adjusted within a switching cycle and/or over a plurality of switching cycles, in addition to the pulse widths or pulse frequencies of the drive current.
摘要翻译：开关电源转换器包括变压器（110），耦合到变压器（110）的开关（108）和耦合到开关（108）的开关控制器（200），用于产生开关驱动信号（207）以导通或关闭开关（108）。开关驱动信号（207）的驱动电流根据开关周期内和/或多个开关周期中的线路或负载条件动态地调整。除了驱动电流的脉冲宽度或脉冲频率之外，驱动电流的大小可以在开关周期内和/或多个开关周期内动态地调节。

6. 发明申请

US20100165672A1 VALLEY-MODE SWITCHING SCHEMES FOR SWITCHING POWER CONVERTERS 有权
标题翻译：用于切换电力转换器的谷模切换方案
公开(公告)号：US20100165672A1
公开(公告)日：2010-07-01
申请号：US12642261
申请日：2009-12-18
申请人： Yong Li , Hien Huu Bui , Junjie Zheng , John William Kesterson
发明人： Yong Li , Hien Huu Bui , Junjie Zheng , John William Kesterson
IPC分类号： H02M3/335
CPC分类号： H02M3/157 , H02M3/33507
摘要： An improved valley-mode switching (VMS) scheme and circuitry for implementing the improved VMS switching scheme in a switch-mode power converter are disclosed. For a given switching cycle, a desired switch turn-on time is determined based on a pulse width modulation, pulse frequency modulation, or other suitable power converter control scheme. Also, one or more times corresponding to local minimums (valleys) are predicted for the voltage across a power switch of the switching power converter. The power switch is turned on at a valley immediately subsequent or otherwise subsequent to the desired switch time determined according to the power converter control scheme. Thus, the improved VMS scheme enables low-voltage switch operation to reduce switching loss and EMI noise without restricting the control scheme of the power converter.
摘要翻译：公开了一种改进的谷模切换（VMS）方案和用于在开关模式功率转换器中实现改进的VMS切换方案的电路。对于给定的开关周期，基于脉冲宽度调制，脉冲频率调制或其它合适的功率转换器控制方案来确定期望的开关导通时间。此外，对于开关功率转换器的电源开关上的电压，预测对应于局部最小值（谷）的一次或多次。电源开关在紧随其后或者根据功率转换器控制方案确定的所需开关时间之后的谷处开启。因此，改进的VMS方案可实现低压开关操作，从而降低开关损耗和EMI噪声，而不会限制功率转换器的控制方案。

7. 发明授权

US08576586B2 Dynamic drive of switching transistor of switching power converter 有权
标题翻译：开关电源转换器开关晶体管的动态驱动
公开(公告)号：US08576586B2
公开(公告)日：2013-11-05
申请号：US12678690
申请日：2007-09-28
申请人： Junjie Zheng , Jun Zheng , Andrew Kwok-Cheung Lee , John William Kesterson , Allan Ming-Lun Lin , Hien Huu Bui , Carrie Seim , Yong Li
发明人： Junjie Zheng , Jun Zheng , Andrew Kwok-Cheung Lee , John William Kesterson , Allan Ming-Lun Lin , Hien Huu Bui , Carrie Seim , Yong Li
IPC分类号： H02M3/335 , H02M3/337 , H02M3/338
CPC分类号： H02M3/33507 , H02M2001/0032 , H03K17/163 , H03K17/166 , Y02B70/16
摘要： A switching power converter comprises a transformer (110), a switch (108) coupled to the transformer (110), and a switch controller (200) coupled to the switch (108) for generating a switch drive signal (207) to turn on or off the switch (108). The drive current of the switch drive signal (207) is adjusted dynamically according to line or load conditions within a switching cycle and/or over a plurality of switching cycles. The magnitude of the drive current can be dynamically adjusted within a switching cycle and/or over a plurality of switching cycles, in addition to the pulse widths or pulse frequencies of the drive current.
摘要翻译：开关电源转换器包括变压器（110），耦合到变压器（110）的开关（108）和耦合到开关（108）的开关控制器（200），用于产生开关驱动信号（207）以导通或关闭开关（108）。开关驱动信号（207）的驱动电流根据开关周期内和/或多个开关周期中的线路或负载条件动态地调整。除了驱动电流的脉冲宽度或脉冲频率之外，驱动电流的大小可以在开关周期内和/或多个开关周期内动态地调节。

8. 发明授权

US08289732B2 Controller for switching power converter driving BJT based on primary side adaptive digital control 有权
标题翻译：基于初级侧自适应数字控制的开关电源转换器驱动BJT的控制器
公开(公告)号：US08289732B2
公开(公告)日：2012-10-16
申请号：US12639399
申请日：2009-12-16
申请人： Yong Li , Jun Zheng , Junjie Zheng , John William Kesterson
发明人： Yong Li , Jun Zheng , Junjie Zheng , John William Kesterson
IPC分类号： H02M3/335
CPC分类号： H02M3/33515 , H02M2001/0009
摘要： A controller of an AC/DC flyback switching power supply uses adaptive digital control approaches to control the switching operation of a BJT power switch based on primary-side feedback to regulate the secondary-side constant output voltage and output current, without using the input line voltage. Switching-cycle by switching-cycle peak current control and limit are achieved based on the sensed primary-side current rather than the input line voltage in both constant-voltage and constant-current modes, operating in PWM, PFM and/or combinations of a plurality of PWM and PFM modes. The controller IC does not need a separate pin and ADC circuitry for sensing the input line voltage. The controller IC directly drives the BJT base, and dynamically adjusts the BJT base current amplitude cycle by cycle based on load change.
摘要翻译： AC / DC反激式开关电源的控制器采用自适应数字控制方式，根据初级侧反馈来控制BJT功率开关的开关动作，调节二次侧恒定输出电压和输出电流，不用输入线电压。基于感测到的初级侧电流而不是在恒定电压和恒定电流模式中的输入线电压来实现开关周期峰值电流控制和限制的开关周期，其以PWM，PFM和/或多个PWM和PFM模式。控制器IC不需要单独的引脚和ADC电路来感测输入线电压。控制器IC直接驱动BJT基座，并根据负载变化动态调整BJT基极电流幅度周期。

9. 发明授权

US08755203B2 Valley-mode switching schemes for switching power converters 有权
标题翻译：用于开关电源转换器的谷模切换方案
公开(公告)号：US08755203B2
公开(公告)日：2014-06-17
申请号：US12642261
申请日：2009-12-18
申请人： Yong Li , Hien Huu Bui , Junjie Zheng , John William Kesterson
发明人： Yong Li , Hien Huu Bui , Junjie Zheng , John William Kesterson
IPC分类号： H02M3/335
CPC分类号： H02M3/157 , H02M3/33507
摘要： An improved valley-mode switching (VMS) scheme and circuitry for implementing the improved VMS switching scheme in a switch-mode power converter are disclosed. For a given switching cycle, a desired switch turn-on time is determined based on a pulse width modulation, pulse frequency modulation, or other suitable power converter control scheme. Also, one or more times corresponding to local minimums (valleys) are predicted for the voltage across a power switch of the switching power converter. The power switch is turned on at a valley immediately subsequent or otherwise subsequent to the desired switch time determined according to the power converter control scheme. Thus, the improved VMS scheme enables low-voltage switch operation to reduce switching loss and EMI noise without restricting the control scheme of the power converter.
摘要翻译：公开了一种改进的谷模切换（VMS）方案和用于在开关模式功率转换器中实现改进的VMS切换方案的电路。对于给定的开关周期，期望的开关导通时间基于脉宽调制，脉冲频率调制或其它合适的功率转换器控制方案来确定。此外，对于开关功率转换器的电源开关上的电压，预测对应于局部最小值（谷）的一次或多次。电源开关在紧随其后或者根据功率转换器控制方案确定的所需开关时间之后的谷处开启。因此，改进的VMS方案可实现低压开关操作，从而降低开关损耗和EMI噪声，而不会限制功率转换器的控制方案。

10. 发明申请

US20100157636A1 CONTROLLER FOR SWITCHING POWER CONVERTER DRIVING BJT BASED ON PRIMARY SIDE ADAPTIVE DIGITAL CONTROL 有权
标题翻译：基于主端自适应数字控制切换功率转换器驱动的控制器
公开(公告)号：US20100157636A1
公开(公告)日：2010-06-24
申请号：US12639399
申请日：2009-12-16
申请人： Yong Li , Jun Zheng , Junjie Zheng , John William Kesterson
发明人： Yong Li , Jun Zheng , Junjie Zheng , John William Kesterson
IPC分类号： H02M7/217
CPC分类号： H02M3/33515 , H02M2001/0009
摘要： A controller of an AC/DC flyback switching power supply uses adaptive digital control approaches to control the switching operation of a BJT power switch based on primary-side feedback to regulate the secondary-side constant output voltage and output current, without using the input line voltage. Switching-cycle by switching-cycle peak current control and limit are achieved based on the sensed primary-side current rather than the input line voltage in both constant-voltage and constant-current modes, operating in PWM, PFM and/or combinations of a plurality of PWM and PFM modes. The controller IC does not need a separate pin and ADC circuitry for sensing the input line voltage. The controller IC directly drives the BJT base, and dynamically adjusts the BJT base current amplitude cycle by cycle based on load change
摘要翻译： AC / DC反激式开关电源的控制器采用自适应数字控制方式，根据初级侧反馈来控制BJT功率开关的开关动作，调节二次侧恒定输出电压和输出电流，不用输入线电压。基于感测到的初级侧电流而不是在恒定电压和恒定电流模式中的输入线电压来实现开关周期峰值电流控制和限制的开关周期，其以PWM，PFM和/或多个PWM和PFM模式。控制器IC不需要单独的引脚和ADC电路来感测输入线电压。控制器IC直接驱动BJT基座，并根据负载变化动态调整BJT基极电流幅度周期

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