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公开(公告)号：US5459417A
公开(公告)日：1995-10-17
申请号：US83413
申请日：1993-06-28
CPC分类号： G01R19/003
摘要： A circuit for monitoring the DC content of an AC waveform includes a differential amplifier having one input connected to the AC waveform and the other input connected to a capacitive-coupled network that eliminates any DC component in the AC waveform at the frequency being monitored. Additional circuitry is required to cancel any phase shift and reactance of the coupling capacitor. The output of the differential amplifier is a signal which represents the amplitude and polarity of the DC content.
摘要翻译： 用于监视AC波形的直流含量的电路包括一个差分放大器，其一个输入连接到AC波形，另一个输入连接到电容耦合网络，消除了处于被监视频率的AC波形中的任何DC分量。 需要额外的电路来消除耦合电容器的任何相移和电抗。 差分放大器的输出是表示DC内容的幅度和极性的信号。
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2.发明授权
公开(公告)号：US4223263A
公开(公告)日：1980-09-16
申请号：US939149
申请日：1978-09-01
CPC分类号： H02K19/38
摘要： A combination exciter/permanent magnet generator for a brushless generator system features a permanent magnet generator wound directly on the exciter structure, while allowing the permanent magnet generator and exciter to be functionally independent of each other. The arrangement is such that the permanent magnet generator provides sufficient voltage under a wide range of speed, load and temperature conditions to turn on power transistors included in a voltage regulator associated with the generator system and to insure adequate system self build-up to a required output voltage without increasing the size of the system as would otherwise be the case.
摘要翻译： 用于无刷发电机系统的组合式励磁机/永磁发电机具有直接缠绕在励磁机结构上的永磁发电机，同时允许永磁发电机和励磁机在功能上彼此独立。 该布置使得永磁发电机在宽范围的速度，负载和温度条件下提供足够的电压，以接通包括在与发电机系统相关联的电压调节器中的功率晶体管，并确保足够的系统自身积聚到所需的 输出电压而不增加系统的尺寸，否则将是这种情况。
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3.发明授权
公开(公告)号：US4186391A
公开(公告)日：1980-01-29
申请号：US936266
申请日：1978-08-22
CPC分类号： G01R31/2632 , H02H7/1255
摘要： A circuit for detecting a failed diode in a multiple diode rectifier bridge detects open or shorted diodes in both multi-phase, half-wave rectification and single or multi-phase full wave rectification arrangements and provides a failure signal for sounding an alarm or tripping the circuit to protect the load or power source as the case may be.
摘要翻译： 用于检测多重二极管整流桥中的故障二极管的电路检测多相，半波整流和单相或多相全波整流装置中的开路或短路二极管，并提供用于发出报警或跳闸的故障信号 电路保护负载或电源，视情况而定。
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公开(公告)号：US4962321A
公开(公告)日：1990-10-09
申请号：US349745
申请日：1989-05-10
IPC分类号： H03K3/0231 , H03K17/30 , H03K17/60
CPC分类号： H03K17/30 , H03K17/603 , H03K3/0231
摘要： A three terminal replacement circuit for a Unijunction Transistor. The circuit simulates the characteristics and parameters of any UJT with appropriate selection of components. The circuit includes a first node having a voltage in accordance with a biasing circuit, a current conducting circuit for relating the voltage at the first node to a voltage at a second node and for conducting current from a terminal B2 to a terminal B1 through the second node in accordance with a resistor provided in that path, a first switching circuit which turns on when a voltage at a terminal E exceeds the voltage at the second node and a second switching circuit which turns on when the first switching circuit faces. The second switching circuit allows current to flow from the terminal E to the terminal B1 when turned on and changes the biasing circuit to lower the voltages at the first node, the second node and the terminal E.
摘要翻译： 用于单结晶体管的三端替换电路。 该电路通过适当的组件选择来模拟任何UJT的特性和参数。 该电路包括具有根据偏置电路的电压的第一节点，用于将第一节点处的电压与第二节点处的电压相关联的电流传导电路，以及用于通过第二节点从端子B2传导电流到终端B1 节点，根据在该路径中设置的电阻器，当端子E处的电压超过第二节点处的电压时接通的第一开关电路和当第一开关电路面对时接通的第二开关电路。 第二开关电路在导通时允许电流从端子E流到端子B1，并且改变偏置电路以降低第一节点，第二节点和端子E处的电压。
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公开(公告)号：US4423374A
公开(公告)日：1983-12-27
申请号：US303738
申请日：1981-09-21
CPC分类号： G01R29/16
摘要： An unbalanced current detector for a three phase electrical system of the type including a current transformer (4, 6, 8) for each phase (.phi.A, .phi.B, .phi.C) and a burden resistor (16) which receives a rectified output of the current transformer is disclosed. The harmonic content of a rectified ripple voltage developed across the burden resistor (16) is applied to a filter (20) for extracting desired frequencies and rejecting other frequencies, and the filter output is applied to a level detecting and amplifying circuit (54) the output of which is applied to an indicator (77) to indicate an unbalanced current condition.
摘要翻译： 一种用于三相电气系统的不平衡电流检测器，包括用于每相（phi A，phi B，phi C）的电流互感器（4,6，8）和负载电阻器（16），该电流互感器接收整流输出 公开了电流互感器。 在负载电阻器（16）上产生的整流波纹电压的谐波含量被施加到滤波器（20），用于提取所需频率并拒绝其他频率，并且滤波器输出被施加到电平检测和放大电路（54）， 其输出被施加到指示器（77）以指示不平衡的当前状况。
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