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    • 3. 发明授权
    • Wide common mode range comparator and method
    • 宽共模范围比较器和方法
    • US5789949A
    • 1998-08-04
    • US719873
    • 1996-09-25
    • Raymond Louis GiordanoHarold Allen Wittlinger
    • Raymond Louis GiordanoHarold Allen Wittlinger
    • H03F3/45H03K5/24H03K5/22
    • H03F3/45183H03F3/45085H03F3/4517H03F3/45269H03K5/2418H03F2203/45094H03F2203/45658H03F2203/45664
    • A transconductance amplifier suitable for the input stage of a comparator with the capability of amplifying input signals with common mode voltage components in a range including the entirety of its operating voltage. Operation at one voltage extreme is accomplished by use of a long tailed pair connection of a pair of bulk modulated FETs with gates at the input terminals of the amplifier. Operation at the other voltage extreme is accomplished by the use of a pair of FETs in a source follower mode to drive common gate transistors of opposite polarity, the gates of the FETs also being connected to the input terminals of the amplifier. A common high impedance load for the comparator is connected to current mirrors of the drains of both pairs of FETs in the amplifier. The circuit may be implemented with bipolar transistors and additional amplification provided. Methods of comparing voltages are also disclosed.
    • 一种跨导放大器,适用于比较器的输入级,具有在包括其整个工作电压的范围内以共模电压分量放大输入信号的能力。 通过使用一对体积调制FET的长尾对连接与放大器的输入端的栅极来实现在一个极端电压下的工作。 通过使用源极跟随器模式中的一对FET来驱动具有相反极性的公共栅极晶体管来实现另一电压极限处的操作,FET的栅极也连接到放大器的输入端。 用于比较器的常见高阻抗负载连接到放大器中两对FET的漏极的电流镜。 该电路可以用双极晶体管实现并且提供额外的放大。 还公开了比较电压的方法。
    • 4. 发明授权
    • Automatic fault monitoring system and motor control system incorporating
same
    • 自动故障监控系统和电机控制系统结合
    • US5642247A
    • 1997-06-24
    • US505695
    • 1995-07-21
    • Raymond Louis Giordano
    • Raymond Louis Giordano
    • H02H1/04H02H7/08H02P7/00H02H5/04
    • H02H7/0838H02P7/04H02H1/04
    • An automatic fault monitoring system prevents the detection of fault conditions during operating modes or conditions that can produce false fault conditions. A motor control system that utilizes an H-bridge circuit having active devices, preferably field effect transistors, in each arm of the bridge. The motor is connected in the leg of the bridge. Currents and voltages are sensed in each arm as different operating conditions represented by input control signals, which may be computer generated, drive the bridge and place the transistors in different states (on or off). Such operating conditions include rotation of the motor in opposite directions and reversal of direction. Fault detection logic is responsive to currents and voltages in the arms and leg of the bridge and provides outputs indicative of over-current fault conditions in the arm and open circuit fault conditions in the leg. Fault detection control logic analyzes the input control signals and also applies them to change the state of the transistors in the H-bridge. When the control signal inputs and the sequence in which they occur represents a command to the H-bridge to reverse the direction of rotation of the motor, the fault detection logic is inhibited thereby preventing false detection of over-current conditions that can occur in response to the back EMF generated by the motor as it stalls and stops briefly while reversing direction of rotation. The fault detection control logic also enables the detection of open load fault condition during states where the motor is being driven in either direction of rotation, but not when a reversal of rotation is occurring or the motor is started from a stopped position and the current in the motor must build exponentially.
    • 自动故障监控系统可以防止在可能产生虚假故障条件的运行模式或条件下检测故障状况。 一种电动机控制系统,其利用在桥的每个臂中具有有源器件(优选场效​​应晶体管)的H桥电路。 电机连接在桥的腿部。 电流和电压在每个臂中被感测,作为由输入控制信号表示的不同操作条件,其可以是计算机生成的,驱动桥并且将晶体管置于不同的状态(开或关)。 这种操作条件包括马达在相反方向的旋转和方向的反转。 故障检测逻辑响应于桥臂的臂和腿中的电流和电压,并提供指示臂中的过电流故障状况和腿部开路故障状态的输出。 故障检测控制逻辑分析输入控制信号,并且还应用它们来改变H桥中晶体管的状态。 当控制信号输入及其发生的顺序代表H桥的命令以反转电动机的旋转方向时,故障检测逻辑被禁止,从而防止可能在响应中发生的过电流状况的错误检测 到电动机产生的反电动势,因为它在停止转动时反转旋转方向暂停停止。 故障检测控制逻辑还能够在电动机沿两个旋转方向被驱动的状态下检测开路负载故障状况,但是当正在发生转动反转或电动机从停止位置起动时, 电机必须指数地建立。