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1.发明授权公开(公告)号：US06861968B2
公开(公告)日：2005-03-01
申请号：US10668397
申请日：2003-09-23
CPC分类号： H03M7/3006 , H03M3/344 , H03M3/50 , H03M7/3026
摘要： A digital-to-analog converter (“DAC”) system utilizes notch filters and chopping modulation technology to remove l/f and other baseband noise from a baseband of a signal of interest. Chopping modulation and demodulation circuitry of the DAC operate at a chopping frequency and all harmonics equal to approximately one-half of a digital input signal sampling frequency. A notch filter attenuates signals having frequencies around the chopping frequency prior to chopping to reduce fold back of noise into the baseband due to parasitic modulation. Another notch filter attenuating signals having frequencies around twice the chopping frequency further reduces fold back of noise into the baseband.
摘要翻译： 数模转换器（“DAC”）系统利用陷波滤波器和斩波调制技术从感兴趣信号的基带去除l / f和其他基带噪声。 DAC的斩波调制和解调电路工作在斩波频率，所有谐波等于数字输入信号采样频率的大约一半。 陷波滤波器在斩波之前衰减具有围绕斩波频率的频率的信号，以减少由于寄生调制而将噪声折回到基带。 衰减具有大约斩波频率两倍的频率的信号的另一个陷波滤波器进一步降低了噪声向基带的折回。
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2.发明授权Signal processing system with baseband noise modulation and noise fold back reduction 有权信号处理系统，具有基带噪声调制和噪声折回公开(公告)号：US06842486B2
公开(公告)日：2005-01-11
申请号：US10425285
申请日：2003-04-29
CPC分类号： H03M3/34 , H03F1/02 , H03F1/26 , H03F3/211 , H03F3/217 , H03F3/2175 , H03F3/38 , H03F2200/331 , H03M3/50
摘要： A digital-to-analog converter (“DAC”) system utilizes chopping modulation technology to remove 1/f and other baseband noise from a baseband of a signal of interest. Chopping modulation and demodulation circuitry of the DAC operate at a chopping frequency equal to approximately one-half of a digital input signal sampling frequency. Chopping at one-half the sampling frequency allows fold back into the baseband of the input signal's frequency components and reduces fold back of noise, such as quantization noise, residing outside the baseband. In a further embodiment, a notch filter attenuates signals having frequencies around the chopping frequency prior to chopping to reduce fold back of noise into the baseband due to parasitic modulation. Coordination of chopping timing also reduces noises in the output of the DAC system.
摘要翻译： 数模转换器（“DAC”）系统利用斩波调制技术从感兴趣信号的基带去除1 / f和其他基带噪声。 DAC的斩波调制和解调电路以等于数字输入信号采样频率的大约一半的斩波频率工作。 以采样频率的一半斩波允许折回到输入信号的频率分量的基带，并减少驻留在基带外的诸如量化噪声的噪声的折返。 在另一实施例中，陷波滤波器在斩波之前衰减具有围绕斩波频率的频率的信号，以减少由于寄生调制而导致的基带的噪声折回。 斩波定时的协调还可以减少DAC系统输出的噪声。
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公开(公告)号：US07994863B2
公开(公告)日：2011-08-09
申请号：US12347155
申请日：2008-12-31
IPC分类号： H03F3/04
CPC分类号： H03F3/45955 , H03F3/005
摘要： An electronic system generates at least one floating supply voltage, wherein during operation of the circuit the floating supply voltage tracks a common mode voltage of first and second differential input signals. By tracking the common mode voltage, in at least one embodiment, the floating supply voltage adjusts as the common mode voltage changes. Thus, the floating supply voltages can be based upon the peak-to-peak values of the first and second output signals without factoring in the common mode voltage. In at least one embodiment, the electronic system provides the floating supply voltages to an amplifier. The amplifier amplifies the first and second differential input signals and generates differential output signals. A differential sampling circuit samples the differential output signals to cancel the common mode voltage from the differential output signals. In at least one embodiment, an analog-to-digital converter converts the sampled differential output signals into a digital output signal.
摘要翻译： 电子系统产生至少一个浮动电源电压，其中在电路运行期间，浮动电源电压跟踪第一和第二差分输入信号的共模电压。 通过跟踪共模电压，在至少一个实施例中，浮动电源电压随着共模电压的变化而调整。 因此，浮动电源电压可以基于第一和第二输出信号的峰 - 峰值而不考虑共模电压。 在至少一个实施例中，电子系统向放大器提供浮动电源电压。 放大器放大第一和第二差分输入信号并产生差分输出信号。 差分采样电路对差分输出信号进行采样，以从差分输出信号中消除共模电压。 在至少一个实施例中，模数转换器将采样的差分输出信号转换成数字输出信号。
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公开(公告)号：US20100164631A1
公开(公告)日：2010-07-01
申请号：US12347155
申请日：2008-12-31
IPC分类号： H03F3/04
CPC分类号： H03F3/45955 , H03F3/005
摘要： An electronic system generates at least one floating supply voltage, wherein during operation of the circuit the floating supply voltage tracks a common mode voltage of first and second differential input signals. By tracking the common mode voltage, in at least one embodiment, the floating supply voltage adjusts as the common mode voltage changes. Thus, the floating supply voltages can be based upon the peak-to-peak values of the first and second output signals without factoring in the common mode voltage. In at least one embodiment, the electronic system provides the floating supply voltages to an amplifier. The amplifier amplifies the first and second differential input signals and generates differential output signals. A differential sampling circuit samples the differential output signals to cancel the common mode voltage from the differential output signals. In at least one embodiment, an analog-to-digital converter converts the sampled differential output signals into a digital output signal.
摘要翻译： 电子系统产生至少一个浮动电源电压，其中在电路运行期间，浮动电源电压跟踪第一和第二差分输入信号的共模电压。 通过跟踪共模电压，在至少一个实施例中，浮动电源电压随着共模电压的变化而调整。 因此，浮动电源电压可以基于第一和第二输出信号的峰 - 峰值而不考虑共模电压。 在至少一个实施例中，电子系统向放大器提供浮动电源电压。 放大器放大第一和第二差分输入信号并产生差分输出信号。 差分采样电路对差分输出信号进行采样，以从差分输出信号中消除共模电压。 在至少一个实施例中，模数转换器将采样的差分输出信号转换成数字输出信号。
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公开(公告)号：US10263532B2
公开(公告)日：2019-04-16
申请号：US13077421
申请日：2011-03-31
申请人： John L. Melanson , Eric J. King
发明人： John L. Melanson , Eric J. King
摘要： An electronic system includes two power supplies to supply an operating voltage to a switching power converter. The first power supply, referred to as a start-up power supply, includes a first source follower transistor to conduct a start-up current for a controller and supply an operating voltage for the controller. The controller controls operation of the switching power converter. A second power supply, referred to as an auxiliary power supply, includes a second source follower transistor to conduct a steady-state operational current for the controller and supply an operating voltage for the controller. In at least one embodiment, once the second power supply begins supplying the operating voltage to the controller, the start-up power supply automatically ceases supplying the start-up current to the controller.
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6.发明授权Input voltage sensing for a switching power converter and a triac-based dimmer 有权开关电源转换器和基于triac的调光器的输入电压检测公开(公告)号：US09307601B2
公开(公告)日：2016-04-05
申请号：US13539004
申请日：2012-06-29
申请人： Zhaohui He , Rahul Singh , Eric J. King , John L. Melanson , William A. Draper
发明人： Zhaohui He , Rahul Singh , Eric J. King , John L. Melanson , William A. Draper
CPC分类号： H05B33/0848 , H05B33/0815 , Y02B20/346
摘要： An electronic lighting system and method described herein control energy provided to an electronic lighting device, such as one or more light-emitting diodes (LEDs) and/or compact fluorescent lamps (CFLs), of the electronic lighting system. A triac-based dimmer phase cuts a line voltage provided to the electronic lighting system. A controller of the electronic lighting system utilizes a probing system to overcome idiosyncrasies of the triac-based dimmer to allow the controller to probe and sense the line voltage. To reduce energy consumption, rather than probing each cycle of the output voltage of the triac-based dimmer, the controller periodically or intermittently probes the output voltage of the triac-based dimmer.
摘要翻译： 本文所述的电子照明系统和方法控制提供给诸如电子照明系统的一个或多个发光二极管（LED）和/或紧凑型荧光灯（CFL）的电子照明装置的能量。 三端双向可控硅开关控制器的调光器相位切断提供给电子照明系统的线路电压。 电子照明系统的控制器利用探测系统来克服基于triac的调光器的特性，以允许控制器探测和感测线路电压。 为了降低能耗，而不是探测基于三端双向可控硅的调光器的输出电压的每个周期，控制器周期性或间歇地探测基于三端双向可控硅的调光器的输出电压。
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公开(公告)号：US20150327339A1
公开(公告)日：2015-11-12
申请号：US14801440
申请日：2015-07-16
申请人： John L. Melanson , Eric King , Rahul Singh
发明人： John L. Melanson , Eric King , Rahul Singh
IPC分类号： H05B33/08
CPC分类号： H05B33/0815 , H05B33/0824 , H05B33/0827 , H05B33/083 , H05B33/0845 , H05B37/02 , H05B39/047 , H05B41/28 , H05B41/2827 , Y02B20/345 , Y02B20/346 , Y02B20/347
摘要： An LED lighting device includes an auxiliary power supply that supplies power to a control circuit of the LED lighting device that receives an input from a terminal of a light-emitting diode (LED) string of the lighting device that has a substantially lower voltage than the line voltage to which the lighting device is connected. The terminal may be within the LED string, or may be an end of the string. A linear regulator may be operated from the voltage drop across a number of the LEDs in the string so that the energy wasted by the auxiliary power supply is minimized. In other designs, the auxiliary power supply may be intermittently connected in series with the LED string only when needed. The intermittent connection can be used to forward bias a portion of the LED string when the voltage supplied to the LED string is low, increasing overall brightness.
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公开(公告)号：US09119262B2
公开(公告)日：2015-08-25
申请号：US14607412
申请日：2015-01-28
申请人： John L. Melanson , William Draper
发明人： John L. Melanson , William Draper
CPC分类号： H05B33/0851 , H05B33/0803 , H05B33/0815 , H05B33/0821 , H05B33/0824 , H05B41/28 , Y02B20/347
摘要： A light emitting diode (LED) lighting system includes a switching power converter having an input for coupling to an alternating current (AC) power source, an output, and a switch. The LED lighting system also includes an LED lighting subsystem coupled to receive power from the output of the switching power converter. The LED lighting subsystem includes a current source for one or more LEDs, and the current source has a control node and a sense node. The LED lighting system additionally includes a switch state controller coupled to the switching power converter and coupled to the LED lighting subsystem. The switch state controller controls switching of the switch and varies a control current provided to the control node of the current source based on at least a parameter sensed from the sense node.
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公开(公告)号：US08749173B1
公开(公告)日：2014-06-10
申请号：US13194699
申请日：2011-07-29
CPC分类号： H02M7/06 , H02M1/36 , H02M3/33507 , H02M2001/0006 , H05B33/0815 , Y02B20/346 , Y10T307/352 , Y10T307/50
摘要： A system and method includes a controller that alternately enables at least two different current paths for a current flowing through a dimmer when the dimmer is in an OFF mode. In at least one embodiment, enabling and disabling the current paths allows a power supply of the dimmer to continue functioning and provides the controller sufficient voltage to continue functioning. One of the current paths is a low impedance path and another current path is a path to a voltage supply node of a switching power converter controller. In at least one embodiment, the controller generates an impedance control signal to enable a low impedance current path for a current in the dimmer and alternately provide a current path to the voltage supply node for the controller.
摘要翻译： 一种系统和方法包括控制器，当调光器处于关闭模式时，控制器交替地使流过调光器的电流至少两个不同的电流路径。 在至少一个实施例中，启用和禁用当前路径允许调光器的电源继续工作，并为控制器提供足够的电压以继续工作。 电流路径中的一个是低阻抗路径，另一个电流路径是到开关功率转换器控制器的电压供应节点的路径。 在至少一个实施例中，控制器产生阻抗控制信号，以使能用于调光器中的电流的低阻抗电流路径，并交替地向控制器的电压供应节点提供电流路径。
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10.发明授权Dimming multiple lighting devices by alternating energy transfer from a magnetic storage element 有权通过从磁存储元件交替传递能量来调光多个照明装置公开(公告)号：US08729811B2
公开(公告)日：2014-05-20
申请号：US12894440
申请日：2010-09-30
申请人： John L. Melanson
发明人： John L. Melanson
CPC分类号： H02M7/06 , H02M1/36 , H02M3/33507 , H02M2001/0006 , H05B33/0815 , Y02B20/346 , Y10T307/352 , Y10T307/50
摘要： A single magnetic storage element is used to provide power to multiple lighting devices, which may be strings of light-emitting diodes (LEDs) of different color. A switching circuit controls alternating application of energy among the multiple lighting devices and another switching circuit may charge the primary winding to different energy levels to control the intensity of the multiple lighting devices. In particular, the multiple lighting devices may be controlled to provide a desired color profile while dimming the lighting devices, while requiring only a single magnetic storage element for supplying energy to the lighting devices.
摘要翻译： 单个磁存储元件用于为多个照明装置提供电力，这些装置可以是不同颜色的发光二极管（LED）串。 开关电路控制多个照明装置之间的能量的交替施加，另一个开关电路可以将初级绕组充电到不同的能级以控制多个照明装置的强度。 特别地，可以控制多个照明装置以在使照明装置调光的同时提供期望的颜色特征，同时仅需要单个磁存储元件来向照明装置提供能量。
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