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公开(公告)号：US4703407A
公开(公告)日：1987-10-27
申请号：US935351
申请日：1986-11-26
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。
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公开(公告)号：US4875000A
公开(公告)日：1989-10-17
申请号：US233929
申请日：1988-08-10
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。
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公开(公告)号：US4655074A
公开(公告)日：1987-04-07
申请号：US764916
申请日：1985-08-12
CPC分类号： G01L27/005
摘要： A pressure transmitter assembly comprises a pressure transducer having a pair of inputs each connected to a separate pressure line. A valve is connected in each pressure line. A pressure equalizing line is connected between the pressure lines at a point between the valves and the pressure transducer. The pressure equalization line is provided with an equalization valve. All three valves are connected to a switching circuit which is controlled by a microprocessor. The switching circuit functions to open both of the valves in the pressure lines while closing the equalizing valves so that the pressure transducer is exposed to two separate pressure and generates a signal corresponding to a difference in two separate pressures. To zero the transducer and recalibrate the transmitter, the low pressure line valve is closed while the equalizing valve is opened. This equalizes the pressure between the two pressure lines so that any signal from the transducer corresponds to a zero pressure difference value.
摘要翻译： 压力变送器组件包括具有一对输入的压力传感器，每个输入端连接到单独的压力线。 每个压力管路连接一个阀门。 在阀和压力传感器之间的点处，压力线之间连接有均压线。 压力平衡管路设有均压阀。 所有三个阀都连接到由微处理器控制的开关电路。 切换电路用于打开压力管路中的两个阀门，同时关闭均压阀，使得压力传感器暴露于两个分开的压力，并产生对应于两个分离压力差的信号。 要使传感器归零并重新校准变送器，低压线路阀在均衡阀打开时关闭。 这使得两个压力线之间的压力相等，使得来自换能器的任何信号对应于零压力差值。
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4.发明授权
公开(公告)号：US4607247A
公开(公告)日：1986-08-19
申请号：US764917
申请日：1985-08-12
摘要： A serial communication interface establishes communication between the microprocessor of a transmitter, to a current loop powered by a power supply. The microprocessor outputs an analog signal corresponding to a process variable and also outputs a serial communication voltage pulse signal. The analog signal is applied to a current regulating circuit which draws current from the power supply onto the current loop in an amount proportional to the process variable. A comparator has one input connected to the microprocessor for receiving the serial communication voltage pulse signal and another input for receiving a fixed selected voltage. The output of the comparator is connected to an input of the current regulating circuit in such a way so that a signal from the comparator is summed with the analog signal. The output signal of the comparator is modulated in synchronism with the voltage pulses and represents a fraction of the analog signal so that both signals can be supplied to the current loop simultaneously.
摘要翻译： 串行通信接口在发射机的微处理器之间建立与电源供电的电流环路之间的通信。 微处理器输出与过程变量对应的模拟信号，并输出串行通信电压脉冲信号。 模拟信号被施加到电流调节电路，该电流调节电路以与过程变量成比例的量将电流从电源吸取到电流回路上。 比较器具有连接到微处理器的一个输入端，用于接收串行通信电压脉冲信号，另一个输入用于接收固定的选定电压。 比较器的输出以这样的方式连接到电流调节电路的输入端，使得来自比较器的信号与模拟信号相加。 比较器的输出信号与电压脉冲同步地被调制，并且表示模拟信号的一部分，使得两个信号可以同时被提供给电流环路。
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公开(公告)号：US4975067A
公开(公告)日：1990-12-04
申请号：US413513
申请日：1989-09-27
CPC分类号： H01R12/52
摘要： A connector for a power module to selectively engage metallic pads positioned on the backplate printed circuit board is disclosed. The connector includes a first set of contacts and a second set of contacts positioned such that the first set of contacts makes engagement with the metallic pads before the second set of contacts make such engagement. The contacts are capable of carrying relatively high current.
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公开(公告)号：US4779074A
公开(公告)日：1988-10-18
申请号：US96742
申请日：1987-09-14
CPC分类号： H03M1/54
摘要： A convertor for converting an analog signal to a digital pulse comprises a switching capacitor which is charged by a differential analog signal supplied to the switching capacitor over an input circuit. The capacitor is discharged over an output circuit with the aid of a constant current supply. The charge level of the capacitor is proportional to the analog signal so that the time it takes the capacitor to discharge to a selected low charge level, is proportional to the analog signal. This time period is used by a microprocessor control to generate a digital pulse having a pulse equal to the discharge time for the capacitor. The microprocessor also selectively connects the input and output circuits to the capacitor for respectively charging and discharging the capacitor.
摘要翻译： 用于将模拟信号转换为数字脉冲的转换器包括通过输入电路提供给开关电容器的差分模拟信号而充电的开关电容器。 借助于恒定电流源，电容器在输出电路上放电。 电容器的充电电平与模拟信号成比例，使得电容放电到选定的低电荷电平所需的时间与模拟信号成比例。 这个时间段由微处理器控制使用以产生具有等于电容器的放电时间的脉冲的数字脉冲。 微处理器还选择性地将输入和输出电路连接到电容器，以分别对电容器充电和放电。
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公开(公告)号：USD326235S
公开(公告)日：1992-05-19
申请号：US468994
申请日：1990-01-22
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公开(公告)号：US4604566A
公开(公告)日：1986-08-05
申请号：US763486
申请日：1985-08-07
CPC分类号： G08C19/02
摘要： A current regulating convertor includes a pulse generator which generates a voltage pulse train having a variable duty cycle. A low pass filter is connected to receive the pulse train and has a cutoff frequency which is well below the frequency of the pulse train. The low pass filter generates a D/C voltage signal which has a voltage level that is proportional to the duty cycle of the pulse train. The D/C signal is used in a circuit that draws a current from a power supply which is proportional to the voltage level of the D/C signal. The power supply is connected to the circuit by a 4-20 mA currrent loop. 6
摘要翻译： 电流调节转换器包括产生具有可变占空比的电压脉冲串的脉冲发生器。 连接低通滤波器以接收脉冲串并具有远低于脉冲串频率的截止频率。 低通滤波器产生具有与脉冲串的占空比成比例的电压电平的D / C电压信号。 D / C信号用于从与D / C信号的电压电平成正比的电源中抽取电流的电路。 电源通过4-20 mA电流回路连接到电路。
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