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    Current fault detection system and method for AC controller
    2.
    发明授权
    Current fault detection system and method for AC controller 失效
    交流控制器的当前故障检测系统和方法

    公开(公告)号：US4875000A

    公开(公告)日：1989-10-17

    申请号：US233929

    申请日：1988-08-10

    申请人： John J. Fry ,  John W. Robertson, Jr. ,  Edward Bastijanic

    发明人： John J. Fry ,  John W. Robertson, Jr. ,  Edward Bastijanic

    IPC分类号： H02H7/08 ,  H02H7/085 ,  H02H7/093

    CPC分类号： H02H7/0833 ,  H02H7/093 ,  H02H7/0858

    摘要： An overcurrent protection system for AC motor control systems which provides a separate overcurrent shut down mechanism for each phase of the AC power used in an AC motor. These separate phase shutdown mechanisms provide protection for minor overcurrent conditions without shutting down the entire motor control system. The overcurrent protection system also provides a mechanical feedback apparatus for totally shutting down the motor control system only in a severe overcurrent condition.

    摘要翻译： 一种用于交流电动机控制系统的过电流保护系统，为交流电动机中使用的交流电源的每个相位提供单独的过流关断机构。 这些单独的相位关闭机构可在不关闭整个电动机控制系统的情况下为较小的过流条件提供保护。 过电流保护系统还提供一种机械反馈装置，仅在严重的过电流状态下完全关闭电机控制系统。

    Apparatus for measuring differential impedances
    4.
    发明授权
    Apparatus for measuring differential impedances 失效
    差分阻抗测量装置

    公开(公告)号：US5068618A

    公开(公告)日：1991-11-26

    申请号：US568660

    申请日：1990-08-15

    申请人： John J. Fry ,  Robert A. Smith

    发明人： John J. Fry ,  Robert A. Smith

    IPC分类号： G01D5/22

    CPC分类号： G01D5/22

    摘要： An apparatus for measuring differential impedances which incorporates a CMOS timer in place of the sine wave generator in a typical AC bridge configuration. A toroidal signal transformer having its primary and secondary windings tightly twisted together and wound around the core lessens temperature drift characteristics. The differential bipolar current signal provided by the secondary winding is passed through an AC to DC converter which is switched by a field effect transistor, thereby eliminating the need for prior art inverter comparator circuits. Finally, by use of a bandpass filter after the signal transformer and by insertion of a capacitor before the AC to DC converter, the need for the active filter stage used in the prior art is eliminated.

    摘要翻译： 一种用于测量差分阻抗的装置，其中采用CMOS定时器代替典型的AC桥结构中的正弦波发生器。 一个环形信号变压器，其初级和次级绕组紧紧地绞在一起并围绕磁芯缠绕，可以降低温度漂移特性。 由次级绕组提供的差分双极性电流信号通过由场效应晶体管切换的AC至DC转换器，从而不需要现有技术的逆变器比较器电路。 最后，通过在信号变压器之后使用带通滤波器并且在AC到DC转换器之前插入电容器，消除了对现有技术中使用的有源滤波器级的需要。

    Analog to digital conversion
    6.
    发明授权
    Analog to digital conversion 失效
    模数转换

    公开(公告)号：US4812848A

    公开(公告)日：1989-03-14

    申请号：US92115

    申请日：1987-09-02

    申请人： John J. Fry

    发明人： John J. Fry

    IPC分类号： H03M1/00 ,  H03M1/60

    CPC分类号： H03M1/60 ,  H03M1/08 ,  H03M1/10 ,  H03M1/122

    摘要： A method and apparatus of converting analog voltage signals to digital frequency signals comprises a voltage to frequency converter having an output which produces pulse trains that are proportional to the voltage level of an analog voltage signal applied to the converter. A microprocessor is connected to the converter for sampling the pulse trains during a fixed sampling period. The microprocessor detects the leading edges of the first and last pulse in the pulse train, stores the occurrence time for the two leading edges and then subtracts the occurrence times to calculate the duration time for all the pulses in the sample period between the leading edges of the first and last pulses. A counter counts the number of pulses between the first and last pulse, and a calculation is made dividing the number of pulses by the time duration to yield an accurate measurement of the frequency for the pulse train. A precision reference voltage along with a plurality of analog voltage signals to be measured, is applied to the plural inputs of a multiplexer. The output of the multiplexer is then amplified and a level shifted before it is applied to the converter. The microprocessor drives the multiplexer to sequentially apply signals to the converter. During each complete cycle of the multiplexer the microprocessor receives a pulse train corresponding to the reference voltage signal. A stored frequency for that reference pulse train is then compared to the actual frequency which results from the reference voltage to determine whether any shifts in ambient conditions have caused shifts in the output of the converter. This shift is interpreted as being caused by changes in ambient condition and is applied equally to all other measured frequencies. In this way, inexpensive components can be used while still maintaining accuracy for a wide range of ambient conditions.

    摘要翻译： 将模拟电压信号转换为数字频率信号的方法和装置包括具有输出的电压 - 频率转换器，该输出产生与施加到转换器的模拟电压信号的电压电平成比例的脉冲串。 微处理器连接到转换器，用于在固定采样周期内采样脉冲串。 微处理器检测脉冲序列中第一个和最后一个脉冲的前沿，存储两个前沿的出现时间，然后减去发生次数，以计算采样周期中所有脉冲的持续时间， 第一个和最后一个脉冲。 一个计数器对第一个和最后一个脉冲之间的脉冲数进行计数，并且计算是将脉冲数除以持续时间，以产生脉冲序列的频率的精确测量。 将精密参考电压连同要测量的多个模拟电压信号一起施加到多路复用器的多个输入端。 然后，多路复用器的输出被放大，并且在施加到转换器之前将电平移位。 微处理器驱动多路复用器以顺序地将信号施加到转换器。 在多路复用器的每个完整周期期间，微处理器接收对应于参考电压信号的脉冲串。 然后将该参考脉冲串的存储频率与由参考电压产生的实际频率进行比较，以确定环境条件中的任何移位是否引起了转换器输出的移位。 这种偏移被解释为由环境条件的变化引起的并且均等地应用于所有其它测量的频率。 以这种方式，可以使用便宜的组件，同时在宽范围的环境条件下仍然保持精度。

    Method for RFI/EMI protection of electronic circuitry
    7.
    发明授权
    Method for RFI/EMI protection of electronic circuitry 失效
    电子电路RFI / EMI保护方法

    公开(公告)号：US5160807A

    公开(公告)日：1992-11-03

    申请号：US743481

    申请日：1991-08-08

    申请人： John J. Fry ,  George R. Hall, II

    发明人： John J. Fry ,  George R. Hall, II

    IPC分类号： H05K9/00

    CPC分类号： H05K9/0033 ,  Y10S174/34 ,  Y10S174/35

    摘要： An arrangement for providing radio frequency and electromagnetic interference protection to at least part of circuitry mounted on a circuit board comprises alternating slots and bridges which form a boundary between a protected area of the circuit board and an unprotected area of the circuit board. The circuit portions which require protection are mounted in the protected area and are covered by a top cover having fingers which extend through the slots. Connecting lines between the protected and unprotected portions of the circuit portions extend along the bridges between the slots. A bottom cover engages under the protected area and mates to the top cover for providing electromagnetic interference protection for the circuit portions within the protected area.

    摘要翻译： 用于向安装在电路板上的电路的至少一部分提供射频和电磁干扰保护的装置包括形成电路板的保护区域和电路板的未受保护区域之间边界的交替的槽和桥。 需要保护的电路部分安装在保护区域中，并被具有延伸穿过狭槽的指状物的顶盖覆盖。 电路部分的受保护部分和未受保护部分之间的连接线沿着槽之间的桥延伸。 底盖接合在保护区下方并配合到顶盖，为保护区内的电路部分提供电磁干扰保护。

    Housing for a process controller
    8.
    发明授权
    Housing for a process controller 失效
    过程控制器的外壳

    公开(公告)号：US5010322A

    公开(公告)日：1991-04-23

    申请号：US287734

    申请日：1988-12-21

    申请人： John J. Fry ,  George R. Hall, II ,  Robert A. Smith

    发明人： John J. Fry ,  George R. Hall, II ,  Robert A. Smith

    IPC分类号： F23N1/02 ,  F23N5/00 ,  F23N5/24

    CPC分类号： F23N5/242 ,  F23N1/02 ,  F23N2023/04 ,  F23N2023/08 ,  F23N2023/38 ,  F23N2031/20 ,  F23N5/003 ,  F23N5/006 ,  G05B2219/24063 ,  G05B2219/24103

    摘要： A combustion control system includes a sensor assembly and a process controller, the sensor assembly including sensors for providing output signals indicative of process variables, the process controller responding to the output signals to maintain a desired operation of the process. The process controller continuously monitors parameters of the sensors and provides alarms whenever any of these parameters deviate from setpoint values, the process controller automatically prioritizing these alarms to provide a display of only the most relevant alarms. A housing enclosing the process controller provides EMI/RFI shielding of the process controller including the attenuation and absorption of the EMI/RFI energy.

    摘要翻译： 燃烧控制系统包括传感器组件和过程控制器，传感器组件包括用于提供指示过程变量的输出信号的传感器，过程控制器响应输出信号以维持过程的期望操作。 过程控制器连续监控传感器的参数，并在任何一个参数偏离设定值时提供报警，过程控制器自动对这些报警进行优先排序，以提供仅显示最相关的报警。 封闭过程控制器的外壳提供过程控制器的EMI / RFI屏蔽，包括EMI / RFI能量的衰减和吸收。

    Apparatus for measuring differential impedances
    9.
    发明授权
    Apparatus for measuring differential impedances 失效
    差分阻抗测量装置

    公开(公告)号：US4837501A

    公开(公告)日：1989-06-06

    申请号：US93432

    申请日：1987-09-04

    申请人： John J. Fry ,  Robert A. Smith

    发明人： John J. Fry ,  Robert A. Smith

    IPC分类号： G01D5/22

    CPC分类号： G01D5/22

    摘要： An apparatus for measuring differential impedances which incorporates a CMOS timer in place of the sine wave generator in a typical AC bridge configuration. A toroidal signal transformer having its primary and secondary windings tightly twisted together and wound around the core lessens temperature drift characteristics. The differential bipolar current signal provided by the secondary winding is passed through an AC to DC converter which is switched by a field effect transistor, thereby eliminating the need for prior art inverter comparator circuits. Finally, by use of a bandpass filter after the signal transformer and by insertion of a capacitor before the AC to DC converter, the need for the active filter stage used in the prior art is eliminated.

    摘要翻译： 一种用于测量差分阻抗的装置，其中采用CMOS定时器代替典型的AC桥结构中的正弦波发生器。 一个环形信号变压器，其初级和次级绕组紧紧地绞在一起并围绕磁芯缠绕，可以降低温度漂移特性。 由次级绕组提供的差分双极性电流信号通过由场效应晶体管切换的AC至DC转换器，从而不需要现有技术的逆变器比较器电路。 最后，通过在信号变压器之后使用带通滤波器并且在AC到DC转换器之前插入电容器，消除了对现有技术中使用的有源滤波器级的需要。

    Power supply for totem pole power switches
    10.
    发明授权
    Power supply for totem pole power switches 失效
    图腾柱电源开关的电源

    公开(公告)号：US4703407A

    公开(公告)日：1987-10-27

    申请号：US935351

    申请日：1986-11-26

    申请人： John J. Fry ,  Edward Bastijanic ,  John W. Robertson, Jr.

    发明人： John J. Fry ,  Edward Bastijanic ,  John W. Robertson, Jr.

    IPC分类号： H03K17/00 ,  H02M7/538 ,  H03K17/66 ,  H02M3/335

    CPC分类号： H02M7/538

    摘要： An improved power supply for power switches arranged in a totem pole configuration is disclosed. A single power supply, having an output voltage substantially less than the voltage applied to the upper power switch, periodically charges a capacitor within a flying capacitor circuit. Microprocessor based control circuitry controls the charging and discharging of the capacitor and the periodic operation of the power switches resulting in the voltage at the output of the power switches being at system common or at the voltage applied to the upper power switch.

    摘要翻译： 公开了以图腾柱结构布置的功率开关的改进的电源。 具有基本上小于施加到上电源开关的电压的输出电压的单个电源周期性地对飞跨电容器电路内的电容器进行充电。 基于微处理器的控制电路控制电容器的充电和放电以及功率开关的周期性操作，导致功率开关输出处的电压处于系统公共或施加到上电源开关的电压。