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公开(公告)号：US5438614A
公开(公告)日：1995-08-01
申请号：US249169
申请日：1994-05-25
CPC分类号： H04L41/0213 , H04L41/24 , H04M11/06
摘要： Apparatus and method for managing transmission of digital data between a digital telephone line and a computer network. First and second modems, a telephone control circuit and a network control circuit respond to management instruction signals to execute predetermined management objectives and generate management response signals representing one or more conditions of the first and second modems, telephone control circuit and network control circuit. In response to a single packet of management signals from the network, a management circuit generates the management instruction signals and independently addresses them to one or more of the first and second modems, telephone control circuit and network control circuit.
摘要翻译： 用于管理数字电话线和计算机网络之间的数字数据传输的装置和方法。 第一和第二调制解调器，电话控制电路和网络控制电路响应于管理指令信号以执行预定的管理目标，并产生表示第一和第二调制解调器，电话控制电路和网络控制电路的一个或多个条件的管理响应信号。 响应于来自网络的单个管理信号包，管理电路产生管理指令信号并且独立地将它们解码到第一和第二调制解调器，电话控制电路和网络控制电路中的一个或多个。
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2.发明授权Control for producing a low magnitude voltage at the output of a PWM inverter 失效控制在PWM逆变器的输出端产生低电平的电压
公开(公告)号：US4875148A
公开(公告)日：1989-10-17
申请号：US285117
申请日：1988-12-16
IPC分类号： H02M7/5387 , H02M7/5395
CPC分类号： H02M7/5387 , H02M7/5395
摘要： At times, it may be necessary to operate switches of a PWM inverter to provide a low output voltage. However, in order to produce such a low voltage, it may be necessary to operate the switches near their minimum on time limit, which can in turn lead to damage or destruction of the switches. In order to overcome this problem, a control for an inverter which produces an output voltage having two levels wherein the inverter includes first and second switches coupled to an inverter output produces first and second switch control signals each having alternating switch on and switch off portions wherein each switch on portion is of a duration in excess of the minimum on time limit of the switches. The first and second switches are operated in accordance with the first and second switch control signals, respectively, to produce the output voltage wherein the switches are operated in a particular switch state for a duration less than the minimum on time limit of the switches to cause the output voltage to assume one of the levels during such time. Inasmuch as the switches are operated for periods of time in excess of the minimum on time limit, the risk of damage to or destruction of the switches is minimized.
摘要翻译： 有时，可能需要操作PWM逆变器的开关以提供低输出电压。 然而，为了产生这样的低电压，可能需要将开关操作在接近于最小限度的时间限制附近，这可能导致开关的损坏或破坏。 为了克服这个问题，产生具有两个电平的输出电压的逆变器的控制，其中逆变器包括耦合到逆变器输出端的第一和第二开关产生每个具有交替开关和断开部分的第一和第二开关控制信号， 每个开启部分的持续时间超过开关的最小限制时间。 第一和第二开关分别根据第一和第二开关控制信号进行操作以产生输出电压，其中开关在特定的开关状态下操作持续时间小于开关的最小开启时间限制 输出电压在此期间承担一个电平。 由于开关的运行时间超过时间限制的最小值，所以开关的损坏或破坏的风险最小化。
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公开(公告)号：US5036451A
公开(公告)日：1991-07-30
申请号：US458499
申请日：1989-12-28
IPC分类号： H02M7/5387
CPC分类号： H02M7/53873
摘要： An inverter control for an N phase inverter includes a single memory which stores a plurality of bytes, circuitry coupled to the memory for developing a series of memory addresses for each phase output of the inverter, each series of memory addresses defining a phase output waveform to be produced and circuitry coupled to the developing circuitry for accessing the memory with a memory address from each series thereof during each of a number of accessing cycles so that N bytes are provided at an output of the memory during each accessing cycle. A demultiplexer is coupled to the memory for deriving gating signals for switches in the inverter from the bytes provided at the output of the memory.
摘要翻译： 用于N相逆变器的逆变器控制器包括存储多个字节的单个存储器，耦合到存储器的电路，用于开发用于逆变器的每个相位输出的一系列存储器地址，每一系列存储器地址限定相位输出波形 以及电路耦合到显影电路，用于在每个访问周期中的每一个期间从其每个系列的存储器地址访问存储器，使得在每个访问周期期间在存储器的输出处提供N个字节。 解复用器耦合到存储器，用于从设置在存储器的输出处的字节导出逆变器中的开关的选通信号。
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公开(公告)号：US4882120A
公开(公告)日：1989-11-21
申请号：US285119
申请日：1988-12-16
IPC分类号： H02M7/537 , H02M7/5387
CPC分类号： H02M7/53875 , H02M2007/4803
摘要： Power inverters for converting DC power into AC power often produce a DC component in the inverter output which is objectionable. In order to overcome this problem, an inverter control according to the present invention detects the magnitude of the DC component in the inverter AC output power and adjusts the time of selected rising and falling edges of control waveforms for switches in the inverter to reduce the magnitude of the DC component.
摘要翻译： 用于将直流电转换为交流电的电力逆变器通常会在逆变器输出中产生不利的直流分量。 为了克服这个问题，根据本发明的逆变器控制检测逆变器AC输出功率中的DC分量的大小，并且调整逆变器中的开关的控制波形的选定上升沿和下降沿的时间以减小幅度 的直流分量。
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公开(公告)号：US4937462A
公开(公告)日：1990-06-26
申请号：US300820
申请日：1989-01-23
IPC分类号： H02J3/42
CPC分类号： H02J3/42 , Y02T50/54 , Y02T50/545 , Y10T307/313 , Y10T307/516 , Y10T307/735
摘要： In aircraft applications, it may be necessary or desirable to transfer one or more loads between a variable speed, constant frequency (VSCF) power generating system and a further source of AC power. Prior controls for effecting such transfer, however, have been unduly complex. In order to overcome this problem, a control for a VSCF system senses the deviation of a parameter of the power developed by an inverter of the system relative to a parameter of the power developed by an AC power source and controls the inverter in accordance with such deviation to cause the parameter of the power developed thereby to approach the parameter of the power developed by the AC power source. The inverter and the AC power source are connected in parallel across one or more loads when the parameter deviation is within a certain range. Either the inverter or the AC power source is thereafter disconnected a certain time after the two were connected in parallel to complete the power transfer.
摘要翻译： 在飞机应用中，可能需要或希望在变速，恒定频率（VSCF）发电系统和另外的交流电源之间传送一个或多个负载。 然而，进行此类转移的先前控制措施过于复杂。 为了解决这个问题，VSCF系统的控制意识到由系统的逆变器开发的功率参数相对于由AC电源产生的功率的参数的偏差，并根据这种控制来控制逆变器 导致由此产生的功率的参数接近由AC电源产生的功率的参数的偏差。 当参数偏差在一定范围内时，逆变器和交流电源并联连接一个或多个负载。 此后，在两个并联连接之后，变频器或交流电源断开一定时间以完成电力传输。
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6.发明授权Communication of packet arrival times to cable modem termination system and uses thereof 失效数据包到达时间到电缆调制解调器终端系统的通信及其使用公开(公告)号：US07145887B1
公开(公告)日：2006-12-05
申请号：US09899365
申请日：2001-07-02
申请人： Ali Akgun , Mark O. Vogel , Christopher J. Rozman
发明人： Ali Akgun , Mark O. Vogel , Christopher J. Rozman
CPC分类号： H04L12/2801 , H04J3/0664 , H04J3/0682 , H04L69/04
摘要： A cable modem communicates the timing of the arrival of certain packets (such as TCP ACK packets) to a cable modem termination system. This timing feature is useful in methods for increasing the throughput in the downstream direction by eliminating TCP ACKs backing up at a cable modem. In particular, a cable modem termination system implementing an unsolicited bandwidth grant service in which unsolicited grants of bandwidth are sent by the cable modem termination system to the cable modem. The grants of bandwidth are timed to arrive at the cable modem simultaneous with or shortly after the arrival of the TCP ACK from an end station connected to the cable modem. Several methods of calculating or predicting when the unsolicited grants should be sent to the cable modem are described. The method is also applicable to other types of packets, such as voice packets from a end station implementing a Voice over Internet Protocol (VoIP) application.
摘要翻译： 电缆调制解调器将某些分组（例如TCP ACK分组）到达的定时通信到电缆调制解调器终端系统。 该定时功能在通过消除在电缆调制解调器备份的TCP ACK来增加下游方向的吞吐量的方法中是有用的。 特别地，实现非请求带宽授权服务的电缆调制解调器终端系统，其中电缆调制解调器终端系统向电缆调制解调器发送带宽的非请求授权。 带宽的授权被定时以在与连接到电缆调制解调器的终端站的TCP ACK到达之后或不久之后同时到达电缆调制解调器。 描述了计算或预测何时将主动拨款发送到电缆调制解调器的几种方法。 该方法还适用于其他类型的分组，例如来自实现因特网协议语音（VoIP）应用的终端站的语音分组。
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7.发明授权System and method for providing high-speed data access using a distributed modem 失效使用分布式调制解调器提供高速数据访问的系统和方法公开(公告)号：US06667986B1
公开(公告)日：2003-12-23
申请号：US09164879
申请日：1998-10-01
IPC分类号： H04M1100
CPC分类号： H04L12/2874 , H04L12/2856 , H04M11/06
摘要： A system and method for communicating data between a user connected to a subscriber line and a data network comprising a first module connected to the subscriber line and a second module, physically separate from the first module, connected to the data network. The first module includes a signal converter for converting analog signals received from the subscriber line to a digital signal for sending over an interconnection path to the second module. The second module includes a modulator/demodulator for converting the digital signal to data packets. The first module may be pooled with M first modules and connected over a shared interconnection path to N second modules. The interconnection path may be concentrated to permit communication of signals from those first and second modules communicating user data at any given time.
摘要翻译： 一种用于在连接到用户线路的用户和数据网络之间传送数据的系统和方法，所述数据网络包括连接到所述用户线路的第一模块和与所述第一模块物理上分离的连接到所述数据网络的第二模块。 第一模块包括用于将从用户线接收的模拟信号转换为数字信号的信号转换器，用于通过互连路径发送到第二模块。 第二模块包括用于将数字信号转换成数据包的调制器/解调器。 第一模块可以与M个第一模块合并，并且通过共享互连路径连接到N个第二模块。 互连路径可以被集中以允许来自那些在任何给定时间传送用户数据的那些第一和第二模块的信号的通信。
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公开(公告)号：US06289097B1
公开(公告)日：2001-09-11
申请号：US09087834
申请日：1998-05-29
申请人： Thomas B. Gregory , Eric V. Erickson , James A. Renkel , Christopher J. Rozman , John M. Sullivan
发明人： Thomas B. Gregory , Eric V. Erickson , James A. Renkel , Christopher J. Rozman , John M. Sullivan
IPC分类号： H04M1100
CPC分类号： H04Q11/0464 , H04L12/2856 , H04L12/2874 , H04M7/122 , H04Q2213/13003 , H04Q2213/13031 , H04Q2213/13034 , H04Q2213/13039 , H04Q2213/13096 , H04Q2213/13103 , H04Q2213/13106 , H04Q2213/1319 , H04Q2213/13191 , H04Q2213/13205 , H04Q2213/13209 , H04Q2213/1322 , H04Q2213/13251 , H04Q2213/13282 , H04Q2213/13292 , H04Q2213/13298 , H04Q2213/13322 , H04Q2213/13381 , H04Q2213/13389 , H04Q2213/13405
摘要： A method and device for providing telephone subscribers serviced from digital loop carrier (“DLC”) systems access to a computer network. The described device includes a redirect repeater with the capability to redirect multiplexed channels of the DLC to a computer network. The redirect repeater is interfaced to the DLC and redirects channels of the multiplexed DLC system to the computer network in response to a redirect signal. The described method includes monitoring the DLC for a call origination message indicating a subscriber is originating a telephone call, buffering messages from the originating telephone call and recognizing a redirect signal indicating the telephone call is to be directed to the computer network. Messages indicating the telephone call is redirected to the computer network are inserted and the messages from the telephone call can then be redirect to the computer network.
摘要翻译： 一种用于提供从数字环路载波（“DLC”）系统接入计算机网络的电话用户的方法和设备。 所描述的设备包括具有将DLC的多路复用信道重定向到计算机网络的能力的重定向中继器。 重定向中继器被连接到DLC并且响应于重定向信号将复用的DLC系统的信道重定向到计算机网络。 所描述的方法包括监视DLC用于指示用户正在发起电话呼叫的呼叫发起消息，来自始发电话呼叫的缓冲消息和识别指示电话呼叫的重定向信号将被引导到计算机网络。 插入指示电话呼叫的消息被重定向到计算机网络，并且来自电话呼叫的消息然后可以被重定向到计算机网络。
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公开(公告)号：US4956598A
公开(公告)日：1990-09-11
申请号：US285423
申请日：1988-12-16
CPC分类号： H02M5/272 , Y10T307/289 , Y10T307/68
摘要： Prior variable speed constant frequency (VSCF) generating systems which utilize an inverter to derive constant frequency power from variable frequency power developed by a generator driven by a prime mover have controlled system output voltage by controlling the excitation of the generator. Such a control technique, however, does not provide voltage regulation of individual phases and minimize undesirable distortion in the system output. In order to overcome the foregoing problem, a control for a VSCF system having a generator and an inverter which receives DC power from a rectifier coupled to the generator controls switches in the inverter to maintain the voltage of the AC power developed by the inverter at a desired level and controls the power applied to an exciter of the generator to maintain the voltage of the DC power at a particular level relative to the voltage of the AC power developed thereby. Distortion in the inverter output is thereby minimized.
摘要翻译： 利用逆变器从由原动机驱动的发电机产生的可变频率功率导出恒定频率功率的先前的变速恒频（VSCF）发电系统通过控制发电机的激励来控制系统的输出电压。 然而，这样的控制技术不提供单相的电压调节并且使系统输出中的不期望的失真最小化。 为了克服上述问题，具有发电机和逆变器的VSCF系统的控制从连接到发电机的整流器接收直流电力控制逆变器中的开关，以将由逆变器产生的交流电力的电压维持在 并且控制施加到发电机的激励器的功率，以将DC功率的电压相对于由此产生的AC电力的电压维持在特定的水平。 因此变频器输出端的失真最小化。
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公开(公告)号：US4905134A
公开(公告)日：1990-02-27
申请号：US291501
申请日：1988-12-29
CPC分类号： H02M5/272 , H02J3/46 , Y10T307/615 , Y10T307/625
摘要： Prior variable speed constant frequency (VSCF) system controls which operate the VSCF system while it is coupled in parallel with an external AC source across a load have controlled inverter output voltage based only upon the reactive current level supplied by the inverter. This has in turn resulted in the possibility of unstable system operation under load. In order to overcome the foregoing problem, a control for controlling the supply of power to a load from an inverter coupled in parallel with an AC power source across the load senses the real and reactive components of the current supplied by the inverter and the phase displacement of the power developed by the inverter relative to the power developed by the AC power source to derive an angular displacement signal. The frequency and phase of the inverter output are controlled in dependence upon the real current component supplied by the inverter and the angular displacement signal while the magnitude of the inverter output is controlled in dependence upon the real and reactive current components. The present control is capable of operating a VSCF inverter in a stable fashion under load.
摘要翻译： 在VSCF系统与负载外部的交流电源并联的情况下，运行VSCF系统的先前的变速恒定频率（VSCF）系统控制只能根据逆变器提供的无功电流来控制逆变器的输出电压。 这反过来也导致系统运行不稳定的可能性。 为了克服上述问题，用于控制来自与跨过负载的交流电源并联连接的逆变器的负载供电的控制感测由逆变器提供的电流的实际和无功分量以及相位移 由逆变器开发的功率相对于由AC电源产生的功率来导出角位移信号。 逆变器输出的频率和相位根据由逆变器提供的实际电流分量和角位移信号进行控制，同时根据实际和无功电流分量控制逆变器输出的幅度。 本控制能够以稳定的方式在负载下操作VSCF逆变器。
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