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1. 发明授权

US06538905B2 DC-to-DC power converter including at least two cascaded power conversion stages 失效
标题翻译：包括至少两个级联功率转换级的DC-DC功率转换器
公开(公告)号：US06538905B2
公开(公告)日：2003-03-25
申请号：US09757991
申请日：2001-01-10
申请人： Fred F. Greenfeld , Karl Rinne
发明人： Fred F. Greenfeld , Karl Rinne
IPC分类号： H02M3335
CPC分类号： H02M1/38 , H02M3/285 , H02M3/33561 , H02M3/33592 , H02M2001/007 , Y02B70/1475
摘要： A DC-DC power converter. According to one embodiment, the power converter includes a symmetrical half-bridge converter including a transformer having a primary winding and first and second secondary windings, a primary circuit coupled to the primary winding, a first rectifier circuit coupled to the first secondary winding, and a second rectifier circuit coupled to the second secondary winding, and first and second buck converters coupled to the half-bridge converter.
摘要翻译： DC-DC电源转换器。根据一个实施例，功率转换器包括对称半桥转换器，其包括具有初级绕组和第一和第二次级绕组的变压器，耦合到初级绕组的初级电路，耦合到第一次级绕组的第一整流器电路，以及耦合到第二次级绕组的第二整流器电路，以及耦合到半桥转换器的第一和第二降压转换器。

2. 发明申请

US20110025217A1 INRUSH CURRENT LIMITER FOR AN LED DRIVER 有权
标题翻译： INRUSH电流限制为LED驱动器
公开(公告)号：US20110025217A1
公开(公告)日：2011-02-03
申请号：US12822290
申请日：2010-06-24
申请人： Xiaodong Zhan , Fred F. Greenfeld , Xiangxu Yu
发明人： Xiaodong Zhan , Fred F. Greenfeld , Xiangxu Yu
IPC分类号： H05B37/02
CPC分类号： H02M3/335 , H05B33/0815
摘要： An inrush current limiter for use with an LED driver including a current limiting device, a bypass switch device, and a switch drive. The current limiting device is placed in the input current path of the LED driver to limit input current to a predetermined maximum level in response to an AC conductive angle modulated voltage. The bypass switch device is coupled in parallel with the current limit device. The switch drive turns on the bypass switch device to at least partially bypass the current limiting device as a voltage level of an input of a switching converter rises. The input current remains sufficiently high without exceeding the maximum level. The switch drive is implemented with a delay network driven either by a separate transformer winding or by a snubber network. The delay network may have a delay based on the delay caused by the current limiting device.
摘要翻译：一种用于LED驱动器的浪涌电流限制器，包括限流装置，旁路开关装置和开关驱动器。电流限制装置被放置在LED驱动器的输入电流路径中，以响应于交流传导角度调制电压将输入电流限制到预定的最大电平。旁路开关装置与限流装置并联连接。当开关转换器的输入的电压电平上升时，开关驱动器将旁路开关器件接通至少部分地旁路限流器件。输入电流保持足够高而不超过最大电平。开关驱动器采用由单独的变压器绕组或缓冲器网络驱动的延迟网络来实现。延迟网络可以基于由限流装置引起的延迟而具有延迟。

3. 发明授权

US06819154B2 Constant deadtime control in a feed forward enabled pulse width modulator controller 失效
公开(公告)号：US06819154B2
公开(公告)日：2004-11-16
申请号：US10357066
申请日：2003-02-03
申请人： Fred F. Greenfeld
发明人： Fred F. Greenfeld
IPC分类号： H03K406
CPC分类号： H02M1/38 , H03K3/0231 , H03K7/08
摘要： A feed forward pulse width modulator compares a ramp signal with a control voltage to control respective states of a pulse width modulation signal. A respective cycle of the ramp signal is generated by charging a capacitor with a charging current that is proportional to input voltage until the voltage across the capacitor reaches a peak threshold that is also proportional to the input voltage. The capacitor is thereupon discharged with a discharging current proportional to the input voltage until the voltage across the capacitor reaches a (non-zero) valley threshold.

4. 发明授权

US08901832B2 LED driver system with dimmer detection 有权
标题翻译： LED驱动器系统，具有调光检测功能
公开(公告)号：US08901832B2
公开(公告)日：2014-12-02
申请号：US13536892
申请日：2012-06-28
申请人： Weihong Qiu , Rakesh Anumula , Fred F. Greenfeld
发明人： Weihong Qiu , Rakesh Anumula , Fred F. Greenfeld
IPC分类号： H05B37/00
CPC分类号： H05B33/0815
摘要： An LED driver system including an input receiving a rectified AC conductive angle modulated voltage on a rectified node, a converter, a low-pass filter, and AC detector, and a driver network. The converter is coupled to the rectified node and includes a power switching device coupled to a switching node, in which the power switching device is controlled to convert the rectified AC conductive angle modulated voltage to an output voltage and output current. The low-pass filter is configured to filter voltage of the switching node to provide a filtered voltage. The AC detector receives the filtered voltage and provides a current sense signal indicative thereof. The driver network controls duty cycle of the power switching device based on the current sense signal.
摘要翻译：一种LED驱动器系统，包括在整流节点上接收经整流的AC导电角度调制电压的输入，转换器，低通滤波器和AC检测器以及驱动器网络。转换器耦合到整流节点，并且包括耦合到开关节点的功率开关装置，其中控制功率开关装置将整流的AC导电角调制电压转换为输出电压和输出电流。低通滤波器被配置为对开关节点的电压进行滤波以提供滤波电压。 AC检测器接收经过滤波的电压并提供指示其的电流检测信号。驱动器网络基于电流检测信号来控制功率开关器件的占空比。

5. 发明授权

US08339055B2 Inrush current limiter for an LED driver 有权
标题翻译： LED驱动器的浪涌电流限制器
公开(公告)号：US08339055B2
公开(公告)日：2012-12-25
申请号：US12822290
申请日：2010-06-24
申请人： Xiaodong Zhan , Fred F. Greenfeld , Xiangxu Yu
发明人： Xiaodong Zhan , Fred F. Greenfeld , Xiangxu Yu
IPC分类号： H05B37/00
CPC分类号： H02M3/335 , H05B33/0815
摘要： An inrush current limiter for use with an LED driver including a current limiting device, a bypass switch device, and a switch drive. The current limiting device is placed in the input current path of the LED driver to limit input current to a predetermined maximum level in response to an AC conductive angle modulated voltage. The bypass switch device is coupled in parallel with the current limit device. The switch drive turns on the bypass switch device to at least partially bypass the current limiting device as a voltage level of an input of a switching converter rises. The input current remains sufficiently high without exceeding the maximum level. The switch drive is implemented with a delay network driven either by a separate transformer winding or by a snubber network. The delay network may have a delay based on the delay caused by the current limiting device.
摘要翻译：一种用于LED驱动器的浪涌电流限制器，包括限流装置，旁路开关装置和开关驱动器。电流限制装置被放置在LED驱动器的输入电流路径中，以响应于交流传导角度调制电压将输入电流限制到预定的最大电平。旁路开关装置与限流装置并联连接。当开关转换器的输入的电压电平上升时，开关驱动器将旁路开关器件接通至少部分地旁路限流器件。输入电流保持足够高而不超过最大电平。开关驱动器采用由单独的变压器绕组或缓冲器网络驱动的延迟网络来实现。延迟网络可以基于由限流装置引起的延迟而具有延迟。

6. 发明申请

US20110101877A1 LED DRIVER WITH OPEN LOOP DIMMING CONTROL 有权
标题翻译： LED驱动器与开环调光控制
公开(公告)号：US20110101877A1
公开(公告)日：2011-05-05
申请号：US12770993
申请日：2010-04-30
申请人： Xiaodong Zhan , Fred F. Greenfeld , Xiangxu Yu
发明人： Xiaodong Zhan , Fred F. Greenfeld , Xiangxu Yu
IPC分类号： H05B37/02 , H05B41/16
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。

7. 发明授权

US07196503B2 Current averaging circuit for a PWM power converter 有权
标题翻译： PWM功率转换器的电流平均电路
公开(公告)号：US07196503B2
公开(公告)日：2007-03-27
申请号：US11087229
申请日：2005-03-23
申请人： Grady M. Wood , Fred F. Greenfeld
发明人： Grady M. Wood , Fred F. Greenfeld
IPC分类号： G05F1/569 , H02M3/335 , H02H7/122
CPC分类号： H02M3/156 , H02M3/3376 , H02M2001/0009 , Y10S323/908
摘要： A current averaging circuit for averaging a piecewise linear switching current waveform of a PWM power converter including first, second and third sample and hold circuits and a sample averaging circuit. The first sample and hold circuit samples a short duration of the current waveform for each PWM cycle and provides corresponding short samples. The second sample and hold circuit samples a long duration of each PWM cycle and provides corresponding long samples. The sample averaging circuit is coupled to the first and second sample and hold circuits, averages corresponding ones of the short and long samples and provides corresponding average values. The third sample and hold circuit samples each average value and provides a current average signal. The waveform may include ramp-on-a-step voltage pulses representing switching current. The current average signal is updated after each current pulse.
摘要翻译：一种电流平均电路，用于平均包括第一，第二和第三采样和保持电路的PWM功率转换器的分段线性开关电流波形和采样平均电路。第一个采样和保持电路为每个PWM周期采样电流波形的短时间，并提供相应的短样本。第二采样和保持电路采样每个PWM周期的持续时间长，并提供相应的长采样。采样平均电路耦合到第一和第二采样和保持电路，平均对应的短和长采样，并提供相应的平均值。第三采样和保持电路对每个平均值进行采样并提供电流平均信号。波形可以包括表示开关电流的逐步斜坡电压脉冲。在每个电流脉冲之后更新当前的平均信号。

8. 发明申请

US20130207555A1 LED DRIVER SYSTEM WITH DIMMER DETECTION 有权
标题翻译：带驱动器检测的LED驱动器系统
公开(公告)号：US20130207555A1
公开(公告)日：2013-08-15
申请号：US13536892
申请日：2012-06-28
申请人： Weihong Qiu , Rakesh Anumula , Fred F. Greenfeld
发明人： Weihong Qiu , Rakesh Anumula , Fred F. Greenfeld
IPC分类号： H05B37/00 , H02P27/05 , H02J7/00
CPC分类号： H05B33/0815
摘要： An LED driver system including an input receiving a rectified AC conductive angle modulated voltage on a rectified node, a converter, a low-pass filter, and AC detector, and a driver network. The converter is to the rectified node and includes a power switching device coupled to a switching node, in which the power switching device is controlled to convert the rectified AC conductive angle modulated voltage to an output voltage and output current. The low-pass filter is configured to filter voltage of the switching node to provide a filtered voltage. The AC detector receives the filtered voltage and provides a current sense signal indicative thereof. The driver network controls duty cycle of the power switching device based on the current sense signal.
摘要翻译：一种LED驱动器系统，包括在整流节点上接收经整流的AC导电角度调制电压的输入，转换器，低通滤波器和AC检测器以及驱动器网络。转换器是整流节点，并且包括耦合到开关节点的功率开关器件，其中控制功率开关器件将整流的AC导电角度调制电压转换为输出电压和输出电流。低通滤波器被配置为对开关节点的电压进行滤波以提供滤波电压。 AC检测器接收经过滤波的电压并提供指示其的电流检测信号。驱动器网络基于电流检测信号来控制功率开关器件的占空比。

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