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1. 发明授权

US08022634B2 Method and system for dimming AC-powered light emitting diode (LED) lighting systems using conventional incandescent dimmers 有权
标题翻译：使用常规白炽灯调光器调光AC供电发光二极管（LED）照明系统的方法和系统
公开(公告)号：US08022634B2
公开(公告)日：2011-09-20
申请号：US12366642
申请日：2009-02-05
申请人： Fred Greenfeld
发明人： Fred Greenfeld
IPC分类号： G05F1/00 , H05B37/02
CPC分类号： H05B39/044 , H05B33/0815 , H05B33/0827 , Y02B20/347
摘要： A dimming control circuit for dimming light emitting diodes receives an AC input voltage signal from a dimming circuit. The control circuit includes a power stage and a current control loop coupled to the power stage. An AC detector is operable to detect an instantaneous value of the AC input voltage signal and to generate a signal indicating whether the AC input voltage signal is present or absent. A current control circuit is operable responsive to the signal to adjust the operation of the current control loop and to control current through the light emitting diodes to achieve the desired dimming, and to prevent inrush current on the AC input voltage signal.
摘要翻译：用于调光发光二极管的调光控制电路从调光电路接收AC输入电压信号。控制电路包括耦合到功率级的功率级和电流控制回路。 AC检测器可操作以检测AC输入电压信号的瞬时值，并产生指示AC输入电压信号是否存在的信号。电流控制电路响应于该信号可操作以调节电流控制回路的操作并且控制通过发光二极管的电流以实现所需的调光，并且防止AC输入电压信号上的浪涌电流。

2. 发明授权

US08344657B2 LED driver with open loop dimming control 有权
标题翻译： LED驱动器采用开环调光控制
公开(公告)号：US08344657B2
公开(公告)日：2013-01-01
申请号：US12770993
申请日：2010-04-30
申请人： Xiaodong Zhan , Fred Greenfeld , Xiangxu Yu
发明人： Xiaodong Zhan , Fred Greenfeld , Xiangxu Yu
IPC分类号： H05B41/36
CPC分类号： H05B33/0815
摘要： An LED driver with open loop dimming including a full wave rectifier circuit, a DC/DC converter, and an oscillator circuit. The rectifier is configured to receive an input voltage in the form of an AC conductive angle modulated voltage and to provide a rectified voltage. The DC/DC converter converts the rectified voltage to an output voltage and an output current, where the output current has a magnitude which varies proportionately with a square of a quadratic mean of the input voltage. The oscillator circuit controls switching of the DC/DC converter with constant frequency and constant duty cycle. The DC/DC converter may be a flyback converter and may include a transformer operated in DCM. The driver may include output voltage and/or output current limit. The output current may be limited when the input voltage is within normal operating range of an AC line voltage from which the input voltage is derived.
摘要翻译：具有开环调光的LED驱动器，包括全波整流电路，DC / DC转换器和振荡电路。整流器被配置为接收AC传导角调制电压形式的输入电压并提供整流电压。 DC / DC转换器将整流电压转换为输出电压和输出电流，其中输出电流具有与输入电压的二次平均值的平方成正比的幅度。振荡器电路控制恒定频率和恒定占空比的DC / DC转换器的开关。 DC / DC转换器可以是反激式转换器，并且可以包括在DCM中操作的变压器。驱动器可以包括输出电压和/或输出电流限制。当输入电压处于从其导出输入电压的AC线电压的正常工作范围内时，输出电流可能受到限制。

3. 发明授权

US08035996B1 Asymmetric zero-voltage switching full-bridge power converters 有权
标题翻译：不对称零电压开关全桥电源转换器
公开(公告)号：US08035996B1
公开(公告)日：2011-10-11
申请号：US12651433
申请日：2009-12-31
申请人： Fred Greenfeld
发明人： Fred Greenfeld
IPC分类号： H02M3/335
CPC分类号： H02M3/3376
摘要： Disclosed are full-bridge power converters providing DC output power at increased conversion efficiencies, and methods of operating full-bridge power converters providing DC output power at increased conversion efficiencies. In disclosed embodiments, the switches of the full-bridge are operated to reduce conduction losses and to provide for zero-voltage switching.
摘要翻译：公开了提供转换效率的直流输出功率的全桥功率转换器，以及提供转换效率的全桥电源转换器的方法，提供直流输出功率。在所公开的实施例中，全桥的开关被操作以减少传导损耗并提供零电压切换。

4. 发明授权

US07944153B2 Constant current light emitting diode (LED) driver circuit and method 有权
标题翻译：恒流发光二极管（LED）驱动电路及方法
公开(公告)号：US07944153B2
公开(公告)日：2011-05-17
申请号：US12002611
申请日：2007-12-17
申请人： Fred Greenfeld
发明人： Fred Greenfeld
IPC分类号： G05F1/00
CPC分类号： H05B33/0851 , H05B33/0818
摘要： A drive circuit supplies a drive current to a plurality of light emitting diodes. The drive circuit includes a voltage converter circuit having a particular topology and including at least one inductive element and at least one switching element. The drive circuit senses a current through one of the inductive and switching elements and generates a feedback signal from the sensed current. The feedback signal has a value indicating the drive current being supplied to the light emitting diodes and the drive circuit controls the operation of the voltage converter responsive to the feedback signal.
摘要翻译：驱动电路向多个发光二极管提供驱动电流。驱动电路包括具有特定拓扑并包括至少一个电感元件和至少一个开关元件的电压转换器电路。驱动电路感测通过电感和开关元件之一的电流，并从感测的电流产生反馈信号。反馈信号具有指示提供给发光二极管的驱动电流的值，并且驱动电路响应于反馈信号控制电压转换器的操作。

5. 发明申请

US20080224625A1 Constant current light emitting diode (LED) driver circuit and method 有权
标题翻译：恒流发光二极管（LED）驱动电路及方法
公开(公告)号：US20080224625A1
公开(公告)日：2008-09-18
申请号：US12002611
申请日：2007-12-17
申请人： Fred Greenfeld
发明人： Fred Greenfeld
IPC分类号： H05B37/02
CPC分类号： H05B33/0851 , H05B33/0818
摘要： A drive circuit supplies a drive current to a plurality of light emitting diodes. The drive circuit includes a voltage converter circuit having a particular topology and including at least one inductive element and at least one switching element. The drive circuit senses a current through one of the inductive and switching elements and generates a feedback signal from the sensed current. The feedback signal has a value indicating the drive current being supplied to the light emitting diodes and the drive circuit controls the operation of the voltage converter responsive to the feedback signal.
摘要翻译：驱动电路向多个发光二极管提供驱动电流。驱动电路包括具有特定拓扑并包括至少一个电感元件和至少一个开关元件的电压转换器电路。驱动电路感测通过电感和开关元件之一的电流，并从感测的电流产生反馈信号。反馈信号具有指示提供给发光二极管的驱动电流的值，并且驱动电路响应于反馈信号控制电压转换器的操作。

6. 发明授权

US08335091B2 Asymmetric zero-voltage switching full-bridge power converters 有权
标题翻译：不对称零电压开关全桥电源转换器
公开(公告)号：US08335091B2
公开(公告)日：2012-12-18
申请号：US13240663
申请日：2011-09-22
申请人： Fred Greenfeld
发明人： Fred Greenfeld
IPC分类号： H02M3/335
CPC分类号： H02M3/3376
摘要： Disclosed are full-bridge power converters providing DC output power at increased conversion efficiencies, and methods of operating full-bridge power converters providing DC output power at increased conversion efficiencies. In disclosed embodiments, the switches of the full-bridge are operated to reduce conduction losses and to provide for zero-voltage switching.
摘要翻译：公开了提供转换效率的直流输出功率的全桥功率转换器，以及提供转换效率的全桥电源转换器的方法，提供直流输出功率。在所公开的实施例中，全桥的开关被操作以减少传导损耗并提供零电压切换。

7. 发明申请

US20120008359A1 ASYMMETRIC ZERO-VOLTAGE SWITCHING FULL-BRIDGE POWER CONVERTERS 有权
标题翻译：不对称零电压开关全桥电源转换器
公开(公告)号：US20120008359A1
公开(公告)日：2012-01-12
申请号：US13240663
申请日：2011-09-22
申请人： Fred Greenfeld
发明人： Fred Greenfeld
IPC分类号： H02M7/5387
CPC分类号： H02M3/3376
摘要： Disclosed are full-bridge power converters providing DC output power at increased conversion efficiencies, and methods of operating full-bridge power converters providing DC output power at increased conversion efficiencies. In disclosed embodiments, the switches of the full-bridge are operated to reduce conduction losses and to provide for zero-voltage switching.
摘要翻译：公开了提供转换效率的直流输出功率的全桥功率转换器，以及提供转换效率的全桥电源转换器的方法，提供直流输出功率。在所公开的实施例中，全桥的开关被操作以减少传导损耗并提供零电压切换。

8. 发明申请

US20110286245A1 DC/DC POWER CONVERTER HAVING ACTIVE SELF DRIVING SYNCHRONOUS RECTIFICATION 审中-公开
标题翻译：具有主动自驱动同步整流的DC / DC电源转换器
公开(公告)号：US20110286245A1
公开(公告)日：2011-11-24
申请号：US13005188
申请日：2011-01-12
申请人： XIAODONG ZHAN , WEIHONG QIU , FRED GREENFELD , ZHIXIANG LIANG
发明人： XIAODONG ZHAN , WEIHONG QIU , FRED GREENFELD , ZHIXIANG LIANG
IPC分类号： H02M3/28
CPC分类号： H02M3/33592 , Y02B70/1475
摘要： A DC/DC voltage converter includes a transformer having a primary side and a secondary side. Primary side circuitry is connected to the primary side and includes a first pair of switching transistors controlled responsive to first control signals from the primary side of the transformer and receiving an input voltage. Secondary side circuitry is connected to the secondary side and includes a second pair of switching transistors controlled responsive to second control signals from the secondary side of the transformer and providing an output voltage. Driver circuitry generates the second control signals responsive to drain and source voltages at each of the second pair of switching transistors and a first and second PWM control signals. Signal shaping circuitry provides the first and second PWM control signals responsive to a drain voltage of each of the second pair of switching transistors.
摘要翻译： DC / DC电压转换器包括具有初级侧和次级侧的变压器。初级侧电路连接到初级侧，并且包括响应于来自变压器的初级侧的第一控制信号控制并接收输入电压的第一对开关晶体管。次级侧电路连接到次级侧，并且包括响应于来自变压器的次级侧的第二控制信号控制并提供输出电压的第二对开关晶体管。驱动器电路响应于第二对开关晶体管中的每一个处的漏极和源极电压以及第一和第二PWM控制信号产生第二控制信号。信号整形电路提供响应于第二对开关晶体管中的每一个的漏极电压的第一和第二PWM控制信号。

9. 发明授权

US07876067B2 High frequency connector-less charging scheme 有权
标题翻译：高频无连接器充电方案
公开(公告)号：US07876067B2
公开(公告)日：2011-01-25
申请号：US11736897
申请日：2007-04-18
申请人： Fred Greenfeld , Guruprakash Radhakrishnan
发明人： Fred Greenfeld , Guruprakash Radhakrishnan
IPC分类号： H02J7/00
CPC分类号： H02J7/025 , H02J50/10
摘要： A connector-less charging circuit includes a transformer having a primary side associated with a secondary side. A primary switch is responsive to a control signal for connecting the transformer to ground during a first portion of a duty cycle, and disconnecting the transformer from ground during the second portion of the duty cycle. An active clamp circuit connects to the primary side of the transformer for recycling leakage energy from the transformer back to the source responsive to the control signal during the second portion of the duty cycle. A PWM controller generates the control signal to both the active clamp circuit and the primary switch.
摘要翻译：无连接器充电电路包括具有与次级侧相关联的初级侧的变压器。主开关响应于用于在占空比的第一部分期间将变压器连接到地的控制信号，并且在占空比的第二部分期间断开变压器与地的连接。有源钳位电路连接到变压器的初级侧，以便在占空比的第二部分期间响应于控制信号将来自变压器的泄漏能量再循环回到源极。 PWM控制器产生对主动钳位电路和主开关的控制信号。

10. 发明申请

US20090195168A1 METHOD AND SYSTEM FOR DIMMING AC-POWERED LIGHT EMITTING DIODE (LED) LIGHTING SYSTEMS USING CONVENTIONAL INCANDESCENT DIMMERS 有权
标题翻译：使用常规不良灯泡调节交流发光二极管（LED）照明系统的方法和系统
公开(公告)号：US20090195168A1
公开(公告)日：2009-08-06
申请号：US12366642
申请日：2009-02-05
申请人： Fred Greenfeld
发明人： Fred Greenfeld
IPC分类号： H05B37/02 , H05B37/00
CPC分类号： H05B39/044 , H05B33/0815 , H05B33/0827 , Y02B20/347
摘要： A dimming control circuit for dimming light emitting diodes receives an AC input voltage signal from a dimming circuit. The control circuit includes a power stage and a current control loop coupled to the power stage. An AC detector is operable to detect an instantaneous value of the AC input voltage signal and to generate a signal indicating whether the AC input voltage signal is present or absent. A current control circuit is operable responsive to the signal to adjust the operation of the current control loop and to control current through the light emitting diodes to achieve the desired dimming, and to prevent inrush current on the AC input voltage signal.
摘要翻译：用于调光发光二极管的调光控制电路从调光电路接收AC输入电压信号。控制电路包括耦合到功率级的功率级和电流控制回路。 AC检测器可操作以检测AC输入电压信号的瞬时值，并产生指示AC输入电压信号是否存在的信号。电流控制电路响应于该信号可操作以调节电流控制回路的操作并且控制通过发光二极管的电流以实现所需的调光，并且防止AC输入电压信号上的浪涌电流。

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