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1. 发明申请

WO2010002547A1 LED DRIVER WITH MULTIPLE FEEDBACK LOOPS 审中-公开
标题翻译：带多个反馈灯的LED驱动器
公开(公告)号：WO2010002547A1
公开(公告)日：2010-01-07
申请号：PCT/US2009/046617
申请日：2009-06-08
申请人： IWATT INC. , CHEN, Yuhui , ZHENG, Junjie , KESTERSON, John, William
发明人： CHEN, Yuhui , ZHENG, Junjie , KESTERSON, John, William
IPC分类号： H05B37/02
CPC分类号： H05B33/0815 , H05B33/0818 , H05B33/0827 , H05B33/086
摘要： An LED driver includes at least two interlocked closed feedback loops. One feedback loop controls the duty cycle of the on/off times of a switch connected in series to the LED string, and the other feedback loop controls the duty cycle of the on/off times of a power switch in the switching power converter that provides a DC voltage applied to the LED string. The LED driver of the present invention achieves fast control of the LED brightness and current sharing among multiple LED strings simultaneously in a power-efficient and cost-efficient manner.
摘要翻译： LED驱动器包括至少两个互锁的闭合反馈回路。一个反馈环路控制与LED串串联的开关的开/关时间的占空比，另一个反馈环控制提供的开关电源转换器中的电源开关的开/关时间的占空比施加到LED串的DC电压。本发明的LED驱动器以功率高效且成本有效的方式实现对LED亮度和多个LED串之间的电流共享的快速控制。

2. 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。

3. 发明申请

WO2012015591A1 DUAL OUTPUT POWER SUPPLY 审中-公开
标题翻译：双输出电源
公开(公告)号：WO2012015591A1
公开(公告)日：2012-02-02
申请号：PCT/US2011/043751
申请日：2011-07-12
申请人： IWATT INC. , ZHENG, Junjie , HAN, Jangsoo
发明人： ZHENG, Junjie , HAN, Jangsoo
IPC分类号： H02M3/00
CPC分类号： H02M3/285 , H02M3/33523 , Y10T307/25
摘要： A single power supply provides at least one constant voltage output and at least one constant current output. The single power supply includes two or more switching power converters, such as flyback converters, that are independently controllable based on an error signal corresponding to the associated output. Further, one or more of the switching power converters can implement such control using primary-side feedback. The switching power converters can be flyback converters. Any switching power converters included the in the single power supply can both be part of a single PCB assembly, part of a single IC package, or part of a single monolith semiconductor die.
摘要翻译：单个电源提供至少一个恒定电压输出和至少一个恒定电流输出。单个电源包括两个或多个基于对应于相关输出的误差信号独立控制的开关电源转换器，例如反激式转换器。此外，一个或多个开关电源转换器可以使用初级侧反馈来实现这种控制。开关电源转换器可以是反激式转换器。包括在单个电源中的任何开关电源转换器都可以是单个PCB组件，单个IC封装的一部分或单个整体半导体芯片的一部分的一部分。

4. 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。

5. 发明申请

WO2010075208A1 CONTROLLER FOR SWITCHING POWER CONVERTER DRIVING BJT BASED ON PRIMARY SIDE ADAPTIVE DIGITAL CONTROL 审中-公开
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：WO2010075208A1
公开(公告)日：2010-07-01
申请号：PCT/US2009/068708
申请日：2009-12-18
申请人： IWATT INC. , LI, Yong , ZHENG, Jun , ZHENG, Junjie , KESTERSON, John, William
发明人： LI, Yong , ZHENG, Jun , ZHENG, Junjie , KESTERSON, John, William
IPC分类号： G05F1/10
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

6. 发明申请

WO2011008635A1 ADAPTIVE DIMMER DETECTION AND CONTROL FOR LED LAMP 审中-公开
标题翻译：适用于LED灯的检测和控制
公开(公告)号：WO2011008635A1
公开(公告)日：2011-01-20
申请号：PCT/US2010/041428
申请日：2010-07-08
申请人： IWATT INC. , ZHENG, Junjie , KESTERSON, John, W. , MYERS, Richard, M. , CHEN, Baorong , CHEN, Gordon
发明人： ZHENG, Junjie , KESTERSON, John, W. , MYERS, Richard, M. , CHEN, Baorong , CHEN, Gordon
IPC分类号： H05B41/36
CPC分类号： H05B33/0845 , H05B33/0815 , Y02B20/347
摘要： An LED lamp is provided in which the output light intensity of the LEDs in the LED lamp is adjusted based on the input voltage to the LED lamp. A dimmer control unit detects a type of dimmer switch during a configuration process. Using the detected dimmer type, the dimmer control unit generates control signals appropriate for the detected dimmer type to provide regulated current to the LEDs and to achieve the desired dimming effect. The LED lamp can be a direct replacement of conventional incandescent lamps in typical wiring configurations found in residential and commercial building lighting applications that use conventional dimmer switches.
摘要翻译：提供了一种LED灯，其中LED灯的LED的输出光强度基于对LED灯的输入电压进行调节。调光器控制单元在配置过程中检测调光器开关的类型。使用检测到的调光器类型，调光器控制单元产生适合于检测到的调光器类型的控制信号，以向LED提供调节电流并实现期望的调光效果。 LED灯可以直接替代传统的白炽灯，它们在使用常规调光开关的住宅和商业建筑照明应用中发现的典型接线配置中。

7. 发明申请

WO2010078122A1 VALLEY-MODE SWITCHING SCHEMES FOR SWITCHING POWER CONVERTERS 审中-公开
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：WO2010078122A1
公开(公告)日：2010-07-08
申请号：PCT/US2009/069064
申请日：2009-12-21
申请人： IWATT INC. , LI, Yong , BUI, Hien, Huu , ZHENG, Junjie , KESTERSON, John, William
发明人： LI, Yong , BUI, Hien, Huu , ZHENG, Junjie , KESTERSON, John, William
IPC分类号： H02M7/00
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方案使得低压开关操作能够在不限制功率转换器的控制方案的情况下降低开关损耗和EMI噪声。

8. 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。

9. 发明申请

WO2009039684A1 DYNAMIC DRIVE OF SWITCHING TRANSISTOR OF SWITCHING POWER CONVERTER 审中-公开
标题翻译：开关电源转换开关晶体管的动态驱动
公开(公告)号：WO2009039684A1
公开(公告)日：2009-04-02
申请号：PCT/CN2007/002846
申请日：2007-09-28
申请人： IWATT INC. , ZHENG, Junjie , ZHENG, Jun , LEE, Andrew, Kwok-Cheung , KESTERSON, John, William , LIN, Allan, Ming-Lun , BUI, Hien Huu , SEIM, Carrie , LI, Yong
发明人： ZHENG, Junjie , ZHENG, Jun , LEE, Andrew, Kwok-Cheung , KESTERSON, John, William , LIN, Allan, Ming-Lun , BUI, Hien Huu , SEIM, Carrie , LI, Yong
IPC分类号： H02M3/28
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。

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