公开(公告)号：US20060261886A1

公开(公告)日：2006-11-23

申请号：US11122435

申请日：2005-05-05

申请人： Thomas Hansen ,  Kim Madsen ,  Claus Neesgaard

发明人： Thomas Hansen ,  Kim Madsen ,  Claus Neesgaard

IPC分类号： H03F3/38

CPC分类号： H03F1/305 ,  H03F2203/7215

摘要： An amplifier system can include a biasing amplifier that provides a first amplified signal to a DC blocking element that is connected with a load based on a first control signal. A power amplifier provides a second amplified signal for driving the load based on a second control signal. A control system controls the biasing amplifier to charge the DC blocking element so as to mitigate a voltage drop across the load (e.g., to substantially eliminate audible artifacts) when the power amplifier is activated to provide the second amplified signal.

摘要翻译： 放大器系统可以包括偏置放大器，其向基于第一控制信号的负载连接的DC阻断元件提供第一放大信号。 功率放大器基于第二控制信号提供用于驱动负载的第二放大信号。 控制系统控制偏置放大器对DC阻断元件充电，以便当功率放大器被激活以提供第二放大信号时，减轻跨负载的电压降（例如，基本上消除可听见的伪像）。

公开(公告)号：US07626793B2

公开(公告)日：2009-12-01

申请号：US11339786

申请日：2006-01-25

申请人： Cetin Kaya ,  James Teng ,  Claus Neesgaard

发明人： Cetin Kaya ,  James Teng ,  Claus Neesgaard

IPC分类号： H02H3/08 ,  H02H9/02 ,  H02H3/00

CPC分类号： H03K17/082

摘要： A circuit and method for determining overcurrent in a FET detects an output voltage of the FET in both a positive and negative polarity. The related positive or negative currents through the FET can be measured to determine whether an overcurrent condition exists. By measuring positive and negative currents in the FET, the overcurrent detector can obtain twice as much information as when measuring a positive current alone, and can respond more readily to overcurrent conditions. The overcurrent detector avoids the constraints typically observed in cycle-by-cycle PWM control with single polarity Vds sensing, while permitting a relaxation in the timing requirements for current sensing. A spike suppression circuit also contributes to longer sensing intervals.

摘要翻译： 用于确定FET中的过电流的电路和方法以正负极性检测FET的输出电压。 可以测量通过FET的相关正或负电流以确定是否存在过电流状况。 通过测量FET中的正电流和负电流，过电流检测器可以获得与单独测量正电流时相同的信息量的两倍，并且可以更容易地响应过电流条件。 过电流检测器避免了在单极性Vds感测的逐周期PWM控制中通常观察到的约束，同时允许电流感测的定时要求松弛。 尖峰抑制电路还有助于更长的感测间隔。

公开(公告)号：US20070171591A1

公开(公告)日：2007-07-26

申请号：US11339786

申请日：2006-01-25

申请人： Cetin Kaya ,  James Teng ,  Claus Neesgaard

发明人： Cetin Kaya ,  James Teng ,  Claus Neesgaard

IPC分类号： H02H3/00

CPC分类号： H03K17/082

摘要： A circuit and method for determining overcurrent in a FET detects an output voltage of the FET in both a positive and negative polarity. The related positive or negative currents through the FET can be measured to determine whether an overcurrent condition exists. By measuring positive and negative currents in the FET, the overcurrent detector can obtain twice as much information as when measuring a positive current alone, and can respond more readily to overcurrent conditions. The overcurrent detector avoids the constraints typically observed in cycle-by-cycle PWM control with single polarity Vds sensing, while permitting a relaxation in the timing requirements for current sensing. A spike suppression circuit also contributes to longer sensing intervals.

摘要翻译： 用于确定FET中的过电流的电路和方法以正负极性检测FET的输出电压。 可以测量通过FET的相关正或负电流以确定是否存在过电流状况。 通过测量FET中的正电流和负电流，过电流检测器可以获得与单独测量正电流时相同的信息量的两倍，并且可以更容易地响应过电流条件。 过电流检测器避免了在单极性Vds感测的逐周期PWM控制中通常观察到的约束，同时允许电流感测的定时要求松弛。 尖峰抑制电路还有助于更长的感测间隔。

公开(公告)号：US20050017799A1

公开(公告)日：2005-01-27

申请号：US10846281

申请日：2004-05-14

申请人： Lars Risbo ,  Claus Neesgaard

发明人： Lars Risbo ,  Claus Neesgaard

IPC分类号： H03F3/217 ,  H03F3/38

CPC分类号： H03F3/2171 ,  H03F3/217 ,  H03F2200/331 ,  H03F2200/78

摘要： A class-D amplifier circuit (30; 30′) providing improved open-loop error for base-band frequencies, such as the audio band, is disclosed. The amplifier circuit (30; 30′) includes a comparator (35) for generating a pulse-width-modulated output signal that is applied to an output power stage (37). An LC filter (32) is at the output of the power stage (37). The amplifier circuit (30; 30′) includes a loop filter having multiple feedback loop paths, with at least one feedback loop path coupled to the output of the power stage (37), and optionally, at least one feedback loop path coupled to the output of the LC filter (32). The transfer function (Hmae(s)) of the loop filter has a real part that has a much steeper slope (on the order of 80 dB/decade) at frequencies above the pulse-width-modulation switching frequency than the slope of its magnitude characteristic at frequencies below this switching frequency.

摘要翻译： 公开了提供诸如音频带的基带频率的改进的开环误差的D类放大器电路（30; 30'）。 放大器电路（30; 30'）包括用于产生施加到输出功率级（37）的脉冲宽度调制输出信号的比较器（35）。 LC滤波器（32）位于功率级（37）的输出端。 放大器电路（30; 30'）包括具有多个反馈环路径的环路滤波器，其中耦合到功率级（37）的输出的至少一个反馈回路路径，以及可选地至少一个耦合到功率级 LC滤波器（32）的输出。 环路滤波器的传递函数（Hmae（s））具有在比脉冲宽度调制开关频率高于其幅度的斜率的频率处具有更陡峭的斜率（大约80dB /十倍）的实部 频率低于该开关频率的特性。

公开(公告)号：US07317355B2

公开(公告)日：2008-01-08

申请号：US11125968

申请日：2005-05-10

申请人： Shifeng Zhao ,  Cetin Kaya ,  James Teng ,  Claus Neesgaard ,  Lieyi Fang ,  Jeff Berwick

发明人： Shifeng Zhao ,  Cetin Kaya ,  James Teng ,  Claus Neesgaard ,  Lieyi Fang ,  Jeff Berwick

IPC分类号： H03F3/217

CPC分类号： H03K17/0822 ,  H03K17/162

摘要： A system and method is provided for detecting an over-current condition in a power field-effect transistor (FET). In one embodiment, an over-current detection circuit for detecting an over-current condition in a power FET comprises a current generator circuit operative to generate a reference current and a plurality of matched FETs operative to receive the reference current and provide a reference voltage, the matched FETs being matched to each other and to the power FET. The over-current detection circuit also comprises a comparator operative to measure a drain-to-source voltage of the power FET and to provide an output that indicates that the drain-to-source voltage of the power FET has exceeded the reference voltage.

摘要翻译： 提供了用于检测功率场效应晶体管（FET）中的过电流状态的系统和方法。 在一个实施例中，用于检测功率FET中的过电流状态的过电流检测电路包括用于产生参考电流的电流发生器电路和用于接收参考电流并提供参考电压的多个匹配FET， 匹配的FET彼此匹配并连接到功率FET。 过电流检测电路还包括比较器，用于测量功率FET的漏极 - 源极电压，并提供指示功率FET的漏极 - 源极电压已经超过参考电压的输出。

公开(公告)号：US20060262473A1

公开(公告)日：2006-11-23

申请号：US11335028

申请日：2006-01-19

申请人： Claus Neesgaard ,  Lars Risbo ,  Anker Bjorn-Josefsen

发明人： Claus Neesgaard ,  Lars Risbo ,  Anker Bjorn-Josefsen

IPC分类号： H02H3/08

CPC分类号： H03F1/52 ,  H03F3/183 ,  H03F3/217 ,  H03F3/68 ,  H03F2200/426

摘要： Overcurrent and overload protection for the power output of a pulse-width-modulated digital audio system is disclosed. The overcurrent protection circuitry includes a latch that is set in responsive to output current from the power output stage that exceeds an overcurrent threshold; the output of the latch gates the pulse-width-modulated control signal to block power output for the remainder of the current pulse-width-modulated cycle; upon the end of the cycle, or the beginning of the next, the latch is cleared to enable power output in that next cycle. Overload protection is provided by circuitry including counters for counting the relative number of overcurrent cycles to normal, non-overcurrent cycles, and generating an overload signal to block power output in the event of too frequent overcurrent cycles.

摘要翻译： 公开了用于脉冲宽度调制数字音频系统的功率输出的过电流和过载保护。 过电流保护电路包括响应于来自功率输出级的输出电流而超过过电流阈值而设置的锁存器; 锁存器的输出将脉冲宽度调制的控制信号门控，以阻止当前脉冲宽度调制周期的其余部分的功率输出; 在循环结束或下一个开始时，锁存器被清零以在下一个周期中使能输出功率。 过载保护由包括计数器的电路提供，用于将过电流周期的相对数量计算为正常的，非过电流的周期，并且在过载频率过大的情况下产生过载信号以阻止功率输出。

公开(公告)号：US20060256492A1

公开(公告)日：2006-11-16

申请号：US11125968

申请日：2005-05-10

申请人： Shifeng Zhao ,  Cetin Kaya ,  James Teng ,  Claus Neesgaard ,  Lieyi Fang ,  Jeff Berwick

发明人： Shifeng Zhao ,  Cetin Kaya ,  James Teng ,  Claus Neesgaard ,  Lieyi Fang ,  Jeff Berwick

IPC分类号： H02H3/08

CPC分类号： H03K17/0822 ,  H03K17/162

摘要： A system and method is provided for detecting an over-current condition in a power field-effect transistor (FET). In one embodiment, an over-current detection circuit for detecting an over-current condition in a power FET comprises a current generator circuit operative to generate a reference current and a plurality of matched FETs operative to receive the reference current and provide a reference voltage, the matched FETs being matched to each other and to the power FET. The over-current detection circuit also comprises a comparator operative to measure a drain-to-source voltage of the power FET and to provide an output that indicates that the drain-to-source voltage of the power FET has exceeded the reference voltage.

摘要翻译： 提供了用于检测功率场效应晶体管（FET）中的过电流状态的系统和方法。 在一个实施例中，用于检测功率FET中的过电流状态的过电流检测电路包括用于产生参考电流的电流发生器电路和用于接收参考电流并提供参考电压的多个匹配FET， 匹配的FET彼此匹配并连接到功率FET。 过电流检测电路还包括比较器，用于测量功率FET的漏极 - 源极电压，并提供指示功率FET的漏极 - 源极电压已经超过参考电压的输出。

公开(公告)号：US06713848B2

公开(公告)日：2004-03-30

申请号：US10145972

申请日：2002-05-14

申请人： Claus Neesgaard

发明人： Claus Neesgaard

IPC分类号： H01L2940

CPC分类号： H05K1/0216 ,  H03F3/2173 ,  H05K2201/09245 ,  H05K2201/1003

摘要： An audio amplifier output stage layout technique achieves minimum cross coupling between audio amplifier channels. Regarding TDAA output stages, the typical TDAA includes two demodulation inductors per audio channel. The two pair of demodulation inductors associated with the TDAA are arranged to form an X-pattern to simultaneously minimize cross coupling between audio amplifier channels and reduce PCB layout size.

摘要翻译： 音频放大器输出级布局技术实现音频放大器通道之间的最小交叉耦合。 关于TDAA输出级，典型的TDAA每个音频通道包括两个解调电感。 与TDAA相关联的两对解调电感器被布置成形成X图案，以同时最小化音频放大器通道之间的交叉耦合并且减小PCB布局尺寸。