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6 条记录 (耗时 0.019 秒)

    Elevator system
    1.
    发明授权
    Elevator system 失效
    电梯系统

    公开(公告)号：US4102436A

    公开(公告)日：1978-07-25

    申请号：US640300

    申请日：1975-12-12

    申请人： Andress Kernick ,  Richard J. Ravas ,  Manvel A. Geyer

    发明人： Andress Kernick ,  Richard J. Ravas ,  Manvel A. Geyer

    IPC分类号： B66B1/36 ,  B66B1/16 ,  B66B1/24 ,  B66B1/40 ,  H02P3/04 ,  B66B1/30

    CPC分类号： B66B1/285

    摘要： An elevator system including an elevator car to be stopped at a predetermined stopping point from any initial speed below a predetermined maximum value, at a predetermined uniform rate of deceleration. The uniform rate of deceleration determines the desired speed versus distance-to-go reference pattern, which is initiated at a predetermined fixed distance from the stopping point. If the car speed is at the maximum value, deceleration will be initiated immediately. If the car speed is below the maximum value, the car is allowed to continue at the same speed until the car speed and location of the car relative to the stopping point match a point on the reference pattern. This point is accurately determined via digital feedback and comparison circuits which start the elevator car on the desired deceleration speed pattern with zero error. When the point on the reference pattern is reached, digital control circuitry including an up-down counter provides an error count for an actuator which controls the deceleration of the car to closely follow the reference pattern.

    摘要翻译： 一种电梯系统，包括以预定的均匀的减速度从预定的最大值以下的任何初始速度停止在预定的停止点处的电梯轿厢。 均匀的减速速度决定了在距离停止点预定的固定距离处开始的期望速度与距离距离参考图案。 如果车速处于最大值，则立即启动减速。 如果轿厢速度低于最大值，则允许轿厢以相同的速度继续，直到轿厢相对于停靠点的轿厢速度和位置与参考图案上的点相匹配。 通过数字反馈和比较电路精确地确定这一点，该电路以零误差启动所需的减速度模式的电梯轿厢。 当达到参考图案上的点时，包括升降计数器的数字控制电路为执行器提供错误计数，该致动器控制轿厢的减速度以紧跟参考模式。

    Broadband microwave integrated circuit amplifier with capacitive neutralization
    2.
    发明授权
    Broadband microwave integrated circuit amplifier with capacitive neutralization 失效
    宽带微波集成电路放大器采用电容中和

    公开(公告)号：US5355095A

    公开(公告)日：1994-10-11

    申请号：US838971

    申请日：1992-02-21

    申请人： Harvey C. Nathanson ,  Richard J. Ravas

    发明人： Harvey C. Nathanson ,  Richard J. Ravas

    IPC分类号： H03F3/18 ,  H03F3/26

    CPC分类号： H03F3/265

    摘要： Push-pull complimentary MOSFET devices are formed in a thin active layer between the top surface of a high resistivity silicon wafer and a insulating layer implanted below the top surface. Each MOSFET is composed of a plurality of cells each having a source, a gate, and a drain region extending fully through the active layer. Grooves extending through the wafer are lined with vias which connect the source regions with a floating ground plane on the bottom of the wafer. The gates of all the cells are connected by a gate bus on the top surface. Air bridges spanning the gates and the source vias connect the drain conductors of each cell. Neutralizing capacitors connected between an input and an opposite output of the push-pull complimentary MOSFET devices match the parasitic capacitances of the devices and provide wide bandwidth amplification with roll off well into the GHz range without the need for tuning inductors.

    摘要翻译： 推挽互补MOSFET器件形成在高电阻率硅晶片的顶表面和植入在顶表面下方的绝缘层之间的薄的有源层中。 每个MOSFET由多个单元组成，每个单元具有完全延伸穿过有源层的源极，栅极和漏极区域。 延伸穿过晶片的沟槽衬有通孔，其将源区域与晶片底部上的浮动接地平面连接。 所有电池的栅极通过顶部表面上的栅极总线连接。 跨过门和源通孔的空气桥连接每个电池的漏极导体。 连接在推挽互补MOSFET器件的输入端和反相输出端之间的中和电容器与器件的寄生电容相匹配，并提供宽带宽放大，无需调谐电感器即可滚动到GHz范围内。

    Pulse generator
    3.
    发明授权
    Pulse generator 失效
    脉冲发生器

    公开(公告)号：US4056105A

    公开(公告)日：1977-11-01

    申请号：US525123

    申请日：1974-11-19

    申请人： Richard J. Ravas

    发明人： Richard J. Ravas

    IPC分类号： A61N1/362 ,  A61N1/36

    CPC分类号： A61N1/362

    摘要： A DC pulse generator, specifically suitable for application as a cardiac pacemaker having a substantially constant energy output which is independent of the output load. The output pulse is derived from a capacitive reactance which is partially discharged to a preselected reference level. The cyclic rate of discharge is maintained substantially constant, and accordingly, the pulse width is varied to assure a constant energy output to the load. The capacitive reactance is charged in between output pulse periods from a matched impedance radioisotope thermoelectric source through a constant current inverter, step-up transformer, voltage doubler, inverter network. The oscillator controlling cyclic discharge of the capacitance through the load and the inverter, which is arranged in a push-pull configuration, is designed to be self-starting to avoid stall conditions during operation. Furthermore, the discharge rate is substantially independent of the DC level and provides a negative rectangular output pulse. In the event external defibrillator pulses are applied, means are provided to conduct resulting current impulses directly into the capacitive reactance which can safely absorb the energy, thus avoiding failures in the internal circuitry elements.

    摘要翻译： 一种直流脉冲发生器，特别适用于作为独立于输出负载的基本上恒定的能量输出的心脏起搏器。 输出脉冲是从部分放电到预选参考电平的电容电抗导出的。 循环放电速率保持基本恒定，因此脉冲宽度变化，以确保向负载输出恒定的能量。 电容电抗在匹配的阻抗放射性同位素热电源通过恒流逆变器，升压变压器，倍压器，逆变器网络的输出脉冲周期之间充电。 控制通过负载和逆变器的电容的循环放电的振荡器被设计成推挽配置，以便自启动以避免在操作期间的失速状态。 此外，放电速率基本上与DC电平无关，并提供负矩形输出脉冲。 在施加外部除颤器脉冲的情况下，提供装置以将导致的电流脉冲直接传导到容纳电抗中，这可以安全地吸收能量，从而避免内部电路元件的故障。

    Wideband frequency multiplier having a silicon carbide varactor for use in high power microwave applications
    4.
    发明授权
    Wideband frequency multiplier having a silicon carbide varactor for use in high power microwave applications 失效
    宽带倍频器具有用于大功率微波应用的碳化硅变容二极管

    公开(公告)号：US5406237A

    公开(公告)日：1995-04-11

    申请号：US185628

    申请日：1994-01-24

    申请人： Richard J. Ravas ,  Harvey C. Nathanson ,  Marvin Cohn ,  Edward C. Niehenke

    发明人： Richard J. Ravas ,  Harvey C. Nathanson ,  Marvin Cohn ,  Edward C. Niehenke

    IPC分类号： H03B1/00 ,  H03B19/05 ,  H03B19/18 ,  H01P1/20

    CPC分类号： H03B19/18 ,  H03B19/05 ,  H03B2201/031

    摘要： The invention provides frequency multiplier circuitry which may be used in the output section of high power microwave systems to efficiently provide higher output frequencies. Generally, one multiplier stage may be utilized to double the frequency of the input signal with several stages being cascaded to achieve even higher frequencies. The varactor diodes utilized in circuits of the invention are preferably constructed primarily of silicon carbide, which has many advantages when compared with current varactors constructed of GaAs or silicon. Some presently preferred embodiments utilize a four terminal varactor bridge instead of a single varactor diode. The invention also teaches several significant techniques for improving the bandwidth of the circuitry, thus allowing variation of the frequency of the input signal without significantly attenuating the output signal.

    摘要翻译： 本发明提供了可以在大功率微波系统的输出部分中使用的倍增器电路，以有效地提供更高的输出频率。 通常，可以利用一个乘法器级将输入信号的频率加倍，并且级数级数达到甚至更高的频率。 在本发明的电路中使用的变容二极管优选主要由碳化硅构成，与由GaAs或硅构成的电流变容二极管相比，其具有许多优点。 一些目前优选的实施例利用四端变容二极管代替单个变容二极管。 本发明还教导了用于改善电路带宽的若干重要技术，从而允许输入信号的频率变化而不会显着衰减输出信号。