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1.发明授权
公开(公告)号：EP0306319B1
公开(公告)日：1993-08-11
申请号：EP88308128.3
申请日：1988-09-01
发明人： Fox, David Alan
IPC分类号： G01R31/26
CPC分类号： G01R31/34 , G01R31/2632
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公开(公告)号：EP0467675A3
公开(公告)日：1993-06-30
申请号：EP91306526.4
申请日：1991-07-18
发明人： Fox, David Alan
摘要： An inverse time delay circuit includes an integrator 10 for receiving a signal representative of a voltage or current in an external circuit and a reference signal. The integrator produces a control signal representative of the integral of the difference between the signals. A comparator U2 compares the control signal to a second reference signal to produce an output which changes logic states when the magnitude of the control signals exceeds the magnitude of the second reference signal. A circuit is provided to control the magnitudes of one or both of the reference signals thereby providing control of the instantaneous and/or ultimate trip levels of the circuit.
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3.发明公开
公开(公告)号：EP0341980A3
公开(公告)日：1991-01-02
申请号：EP89304679.7
申请日：1989-05-09
IPC分类号： H02P9/30
CPC分类号： H02J7/242 , H02P9/305 , H02P2101/30
摘要： Voltage regulation of a DC electrical power source having a generator (10) with an exciter field coil for producing an AC output voltage which is rectified to produce a DC output voltage, is accomplished by producing voltage signals proportional to the AC output voltage of the generator and the current in the generator exciter field winding, and combining these signals to produce a control signal. An additional voltage signal proportional to the DC output voltage of the power source is compared to a DC reference voltage signal to produce a trim error voltage signal. The trim error voltage signal is combined with an AC reference signal to produce an additional control signal. These control signals are compared and the result of that comparison is used to control the current in the generator exciter field winding.
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公开(公告)号：EP0377327A2
公开(公告)日：1990-07-11
申请号：EP89313651.5
申请日：1989-12-28
发明人： Fox, David Alan
IPC分类号： H02P9/10
CPC分类号： H02P9/102 , H02P2101/30
摘要： A method of regulating the output voltage of an electric generator 10 combines a signal representative of the actual output of the generator with a reference signal to obtain a control signal proportional to the difference between the desired output and the actual output. The control signal is modified by a non-linear transfer function which is representative of the gain of the generator over an expected operating speed and load range. The exciter field current of the generator is controlled in response to the modified control signal, thereby causing the actual output to approach the desired output. Compensation for variation in generator gain is provided by a non-linear element, inserted in the voltage control loop such that the total loop gain is substantially constant over the operating speed and load range of the generator.
摘要翻译： 调节发电机10的输出电压的方法将表示发电机的实际输出的信号与参考信号相结合，以获得与所需输出与实际输出之间的差成比例的控制信号。 控制信号通过非线性传递函数进行修改，该函数表示发电机在预期运行速度和负载范围内的增益。 响应于修改的控制信号来控制发电机的励磁场电流，从而使实际输出接近期望的输出。 发电机增益变化的补偿由插入电压控制回路中的非线性元件提供，使得总环路增益在发电机的工作速度和负载范围内基本恒定。
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5.发明公开Circuit for automatic paralleling of ac power sources 失效Schaltung zum automatischen Parallelschalten von Wechselstromversorgungseinrichtungen。
公开(公告)号：EP0301904A2
公开(公告)日：1989-02-01
申请号：EP88307052.6
申请日：1988-07-29
发明人： Fox, David Alan
IPC分类号： H02J3/42
CPC分类号： H02J3/42 , Y10T307/406 , Y10T307/576 , Y10T307/735
摘要： A system for effecting parallel operation of a pair of AC power sources (10, 18) includes a monitoring circuit (34) for monitoring the difference voltage occurring between output voltages on corresponding phases (12, 20) of the power sources. A capacitor (C2) is connected to a charging circuit and to an output of the monitoring circuit. When the difference voltage occurring between the output voltages on corresponding phases of the power sources exceeds a predetermined threshold level, the capacitor is shorted. Paralleling of the power sources is inhibited when the capacitor voltage is below a second predetermined threshold level.
摘要翻译： 一种用于实现一对AC电源（10,18）的并联运行的系统包括监视电路（34），用于监视在电源的相应相位（12,20）上的输出电压之间出现的差值电压。 电容器（C2）连接到充电电路和监视电路的输出端。 当在电源的相应相位上的输出电压之间出现的差值电压超过预定阈值电平时，电容器短路。 当电容器电压低于第二预定阈值电平时，电源的并联被禁止。
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公开(公告)号：EP0473428A3
公开(公告)日：1992-12-23
申请号：EP91307910.9
申请日：1991-08-29
发明人： Beg, Mirza Akmal , Fox, David Alan
摘要： An overcurrent trip circuit monitors the rate of rise of the current and the magnitude of the current in a power conductor 14 and opens a circuit containing the power conductor when either the rate of rise of the current exceeds a first preselected limit value or the magnitude of the current exceeds a second preselected limit value. The inherent inductance in a metering shunt 18 is used to produce a voltage signal that contains a component which is representative of the rate of change of current in a power conductor. This voltage signal is compared to a first reference signal to produce a trip signal when the voltage exceeds the first reference signal. In addition, the voltage signal is processed and the processed voltage signal is compared to a second reference signal to produce a second trip signal when the magnitude of the processed voltage signal exceeds the magnitude of the second reference signal. The power circuit is then opened in response to either of the first or second trip signals.
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公开(公告)号：EP0329451A3
公开(公告)日：1992-11-19
申请号：EP89301528.9
申请日：1989-02-16
发明人： Fox, David Alan
CPC分类号： G01D5/2492 , H03M1/285
摘要： A position detector is provided with an encoded element (26) having indicia (30, 32, 34) representative of a bit pattern of a pair of bits of a Gray code and a pair of sensors (38, 40) responsive to this indicia. The encoded element is capable of being mechanically coupled to a movable member and the sensor are spaced apart by a distance corresponding to a shift in the bit pattern between two bits of the Gray code such that movement of the encoded element past the sensors is used to produce two bits of the Gray code. An additional encoded element (44) and sensors (50, 52) are used to produce additional bits of the Gray code.
摘要翻译： 位置检测器设置有编码元件（26），其具有代表格雷码的一对比特的比特模式的标记（30,32,34）和响应于该标记的一对传感器（38,40）。 经编码的元件能够机械地耦合到可移动部件，并且传感器间隔开与格雷码两比特之间的比特图案中的位移相对应的距离，使得编码元件通过传感器的移动被用于 产生格雷码两位。 附加编码元件（44）和传感器（50,52）用于产生格雷码的附加位。
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公开(公告)号：EP0376728A3
公开(公告)日：1991-11-21
申请号：EP89313655.6
申请日：1989-12-28
发明人： Fox, David Alan
CPC分类号： H02P9/305 , H02M5/458 , H02P2101/30
摘要： A method of regulating the output voltage of an electric power source combines a status signal representative of the output voltage of the power source with a reference signal to produce a first control signal. A status signal representative of the output current of the power source is combined with the reference signal to produce a second control signal. A bias voltage signal is applied to a junction point 100 and the first and second control signals are connected through an OR network CR19, CR20, CR21 to the junction point, thereby forming an output signal at the junction point. The power source output is then controlled in response to this output signal. Under normal operating conditions, the magnitude of the control signal corresponding to the power source output voltage is less than the magnitude of the bias voltage signal, and the magnitude of the control signal representative of current is greater than the magnitude of the bias voltage signal, such that the voltage sensing loop is in control of the power source output.
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公开(公告)号：EP0350301A3
公开(公告)日：1990-12-19
申请号：EP89306854.4
申请日：1989-07-06
CPC分类号： H03K17/0826 , H03K17/16
摘要： A current limited DC power controller is provided with an output stage (10) having a controllable solid state switching device (Q1) for conducting current between a pair of output terminals (12, 14) and a drive circuit (20) for controlling the operation of this switching device in response to a control signal. A programmable current source (30) is used to produce a reference current signal in response to a command signal and this reference current signal passes through a resistor (R2) to produce a reference voltage signal having a magnitude proportional to the command signal. When the power controller is off, the reference voltage signal is clamped to a preselected value. A second voltage signal proportional to the load current is combined with the referenced voltage signal and used to produce the control signal to which the drive circuit responds.
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公开(公告)号：EP0377327A3
公开(公告)日：1990-08-29
申请号：EP89313651.5
申请日：1989-12-28
发明人： Fox, David Alan
IPC分类号： H02P9/10
CPC分类号： H02P9/102 , H02P2101/30
摘要： A method of regulating the output voltage of an electric generator 10 combines a signal representative of the actual output of the generator with a reference signal to obtain a control signal proportional to the difference between the desired output and the actual output. The control signal is modified by a non-linear transfer function which is representative of the gain of the generator over an expected operating speed and load range. The exciter field current of the generator is controlled in response to the modified control signal, thereby causing the actual output to approach the desired output. Compensation for variation in generator gain is provided by a non-linear element, inserted in the voltage control loop such that the total loop gain is substantially constant over the operating speed and load range of the generator.
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