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1. 发明申请

WO2010077453A1 ADAPTIVE MULTI-MODE DIGITAL CONTROL IMPROVING LIGHT-LOAD EFFICIENCY IN SWITCHING POWER CONVERTERS 审中-公开
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：WO2010077453A1
公开(公告)日：2010-07-08
申请号：PCT/US2009/064618
申请日：2009-11-16
申请人： IWATT INC. , LI, Yong , SEIM, Carrie , ZHENG, Junjie , KESTERSON, John, W. , YAN, Liang , POON, Clarita , SHI, Fuqiang
发明人： LI, Yong , SEIM, Carrie , ZHENG, Junjie , KESTERSON, John, W. , YAN, Liang , POON, Clarita , SHI, Fuqiang
IPC分类号： G05F1/00
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.
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状态的第一个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，最后到第二个PWM模式 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。

2. 发明申请

WO2010101692A1 POWER CONTROL FOR TRANSITION BETWEEN MULTIPLE MODULATION MODES 审中-公开
标题翻译：多个调制模式之间的转换功率控制
公开(公告)号：WO2010101692A1
公开(公告)日：2010-09-10
申请号：PCT/US2010/023219
申请日：2010-02-04
申请人： IWATT INC. , WANG, Xiaoyan , YAN, Liang , ZHENG, Junjie , KESTERSON, John, William , POON, Clarita
发明人： WANG, Xiaoyan , YAN, Liang , ZHENG, Junjie , KESTERSON, John, William , POON, Clarita
IPC分类号： G05F1/00
CPC分类号： H02M3/33507 , H02M2001/0032 , Y02B70/16
摘要： In a switching power converter, PWM mode and PFM mode are separated into two independent control sections with the control voltage range in each control section determined independently. Each of the PWM and PFM modulation modes cannot operate continuously beyond its boundaries, thereby forming a control gap between the two control sections within which no continuous operation is allowed. In order to supply a load condition within the control gap, the power supply operates at the two boundaries of the control gap. Transition between PWM and PFM modes occurs fast, with low output voltage ripple. No limitation needs to be imposed on the control voltage range in each of the PWM and PFM control sections, because the control parameters in the PWM and PFM control sections need not be matched to one another, due to separation of the PWM and PFM modes by the control gap.
摘要翻译：在开关电源转换器中，PWM模式和PFM模式分为两个独立控制部分，每个控制部分的控制电压范围独立确定。每个PWM和PFM调制模式不能连续超过其边界，从而在两个控制部分之间形成一个控制间隙，在这两个控制部分之间不允许连续操作。为了在控制间隙内提供负载条件，电源在控制间隙的两个边界处工作。 PWM和PFM模式之间的转换发生得很快，输出电压波动较小。由于PWM和PFM控制部分中的控制参数不需要彼此匹配，所以PWM和PFM控制部分的控制电压范围不需要对每个PWM和PFM控制部分的控制电压范围施加限制，控制差距。

3. 发明申请

WO2009032685A1 HYBRID PWM AND PFM CURRENT LIMIT CONTROL 审中-公开
标题翻译：混合PWM和PFM电流限制控制
公开(公告)号：WO2009032685A1
公开(公告)日：2009-03-12
申请号：PCT/US2008/074457
申请日：2008-08-27
申请人： IWATT INC. , LI, Yong , ZHENG, Junjie , YAN, Liang , KESTERSON, John , WANG, Xiao Yan
发明人： LI, Yong , ZHENG, Junjie , YAN, Liang , KESTERSON, John , WANG, Xiao Yan
IPC分类号： G05F1/00
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太低时，开关频率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。

4. 发明申请

WO2003032477A3 INTEGRATED MAGNETICS FOR A DC-DC CONVERTER WITH FLEXIBLE OUTPUT INDUCTOR 审中-公开
公开(公告)号：WO2003032477A3
公开(公告)日：2003-04-17
申请号：PCT/US2002/032703
申请日：2002-10-15
申请人： NORTHEASTERN UNIVERSITY , YAN, Liang , QU, Dayu , LEHMAN, Bradley
发明人： YAN, Liang , QU, Dayu , LEHMAN, Bradley
IPC分类号： H02M3/335
摘要： An integrated magnetic assembly (100) that allows the primary and secondary windings of a transformer and a separate inductor winding to be integrated on a unitary magnetic structure (102) is disclosed. The unitary magnetic structure (102) includes first, second, and third legs (104, 106, 108) that are physically connected and magnetically coupled. The primary and secondary windings of the transformer can be formed on the third leg (108) of the unitary magnetic structure (102). Alternatively, the primary and secondary windings can be split between the first and second legs (104, 106). Thus, the primary winding includes first and second primary windings (110, 112) disposed on the first and second legs (104, 106) and the secondary winding includes first and second secondary windings (114, 116) disposed on the first and second legs (104, 106). The inductor winding (118) may also be formed either on the third leg (118) or it may split into first and second inductor windings and disposed on the first and second legs (104, 106). In addition, one or more legs may include an energy storage component such as an air gap (120). This integration of the primary and secondary windings and the inductor winding on the unitary magnetic structure advantageously decouples the inductor function from the transformer function and allows the more optimal design of both the inductor and the transformer. The unitary magnetic structure (102) may be coupled to a full bridge, a half bridge, or a push pull voltage input source to form a DC-DC converter.

5. 发明申请

WO2003032477A2 INTEGRATED MAGNETICS FOR A DC-DC CONVERTER WITH FLEXIBLE OUTPUT INDUCTOR 审中-公开
标题翻译：具有柔性输出电感器的直流 - 直流转换器的集成磁场
公开(公告)号：WO2003032477A2
公开(公告)日：2003-04-17
申请号：PCT/US2002/032703
申请日：2002-10-15
申请人： NORTHEASTERN UNIVERSITY , YAN, Liang , QU, Dayu , LEHMAN, Bradley
发明人： YAN, Liang , QU, Dayu , LEHMAN, Bradley
IPC分类号： H02M3/335
CPC分类号： H02M3/337 , H01F27/38 , H01F37/00 , H01F2038/026 , H02M3/33523
摘要： An integrated magnetic assembly that allows the primary and secondary windings of a transformer and a separate inductor winding to be integrated on a unitary magnetic structure is disclosed. The unitary magnetic structure includes first, second, and third legs that are physically connected and magnetically coupled. The primary and secondary windings of the transformer can be formed on the third leg of the unitary magnetic structure. Alternatively, the primary and secondary windings can be split between the first and second legs. Thus, the primary winding includes first and second primary windings disposed on the first and second legs and the secondary winding includes first and second secondary windings disposed on the first and second legs. The inductor winding may also be formed either on the third leg or it may split into first and second inductor windings and disposed on the first and second legs. In addition, one or more legs may include an energy storage component such as an air gap. This integration of the primary and secondary windings and the inductor winding on the unitary magnetic structure advantageously decouples the inductor function from the transformer function and allows the more optimal design of both the inductor and the transformer. The unitary magnetic structure may be coupled to a full bridge, a half bridge, or a push pull voltage input source to form a DC-DC converter.
摘要翻译：公开了一种允许变压器的初级和次级绕组和单独的电感器绕组集成在单一磁性结构（102）上的集成磁性组件（100）。单一磁性结构（102）包括物理连接并磁耦合的第一，第二和第三腿（104,106,108）。变压器的初级和次级绕组可以形成在整体磁性结构（102）的第三腿部（108）上。或者，主和次级绕组可以在第一和第二支腿（104,106）之间分开。因此，初级绕组包括设置在第一和第二支腿（104,106）上的第一和第二初级绕组（110,112），次级绕组包括设置在第一和第二支腿上的第一和第二次级绕组（114,116）（104,106）。电感绕组（118）也可以形成在第三支腿（118）上，或者它可以分成第一和第二电感器绕组并且设置在第一和第二支腿（104,106）上。另外，一个或多个腿可以包括能量存储部件，例如气隙（120）。主和次级绕组和电感绕组在整体磁性结构上的集成有利于将电感器功能与变压器功能相分离，并允许电感器和变压器两者更优化的设计。单一磁结构（102）可以耦合到全桥，半桥或推挽电压输入源，以形成DC-DC转换器。

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