公开(公告)号：US5383194A

公开(公告)日：1995-01-17

申请号：US973069

申请日：1992-11-06

申请人： Mark D. Sloan ,  William A. Rogers ,  Srihari Shoroff

发明人： Mark D. Sloan ,  William A. Rogers ,  Srihari Shoroff

IPC分类号： G01R31/30 ,  G11C29/00

CPC分类号： G01R31/30

摘要： An integrated logic circuit according to the present invention includes a plurality of logic circuit elements, such as field effect transistors, for performing a combinational logic function, and at least one test controlled-impedance element for loading the logic circuit and causing a first digital output signal to be produced when the impedance of a logic circuit element under test is within a predetermined range and produce another digital output signal when the impedance of the logic circuit element under test is outside the predetermined range. The test controlled-impedance elements typically comprise field effect transistors and are sized in accordance with a series of constraints. The constraints are obtained by considering the operation of the circuit under various impedance fault conditions (high, low and intermediate) and deriving a series of size relationships between the impedance values of the logic circuit and test elements. The impedance faults capable of being detected include the conventional stuck-on (LIF) arid stuck-off (HIF) impedance faults and also intermediate impedance faults (IHIF, ILIF) caused by a too high or too low an impedance in a transistor's on- and off-state modes of operation, respectively.

摘要翻译： 根据本发明的集成逻辑电路包括用于执行组合逻辑功能的多个逻辑电路元件，例如场效应晶体管，以及至少一个用于加载逻辑电路并产生第一数字输出的测试受控阻抗元件 当被测逻辑电路元件的阻抗在预定范围内时产生的信号，并且当被测逻辑电路元件的阻抗在预定范围之外时产生另一数字输出信号。 测试控制阻抗元件通常包括场效应晶体管，并且根据一系列约束来定尺寸。 通过考虑电路在各种阻抗故障条件（高，低和中等）条件下的操作并得出逻辑电路和测试元件的阻抗值之间的一系列尺寸关系，可以获得约束。 能够检测到的阻抗故障包括常规的固定（LIF）干扰（HIF）阻抗故障以及由晶体管导通时阻抗过高或过低引起的中间阻抗故障（IHIF，ILIF） 和离态操作模式。

公开(公告)号：US4889180A

公开(公告)日：1989-12-26

申请号：US338189

申请日：1989-04-14

申请人： Mark D. Sloan

发明人： Mark D. Sloan

IPC分类号： F25C3/04

CPC分类号： F25C3/04 ,  F25C2303/0481

摘要： A system for use in providing compressed air for snow making equipment used in conjunction with a liquid cooled air compressor, including a plurality of motor driven fans and a heater coil assembly positioned in a portion of the path of the air moved by each of the fans, the heater coil assembly having a liquid coolant flowing therethrough, an air-to-air heat exchanger positioned adjacent the heater coil assembly and in the air flow paths of the fans, the air-to-air heat exchanger being connected in series with the air compressor and the snow making equipment and serving to reduce the temperature of the compressed air flowing from the compressor to the snow making equipment, actuator controlled louvers positioned above the air-to-air heat exchanger, there being one louver for each fan, a liquid cooling coil assembly supported adjacent the air-to-air heat heat exchanger and in a separate air flow path, a liquid transfer pump for moving cooling liquid from the compressor and a control assembly which may be a manually controlled valve for passing coolant liquid from the compressor through both the heater coil assembly and the liquid cooling coil assembly in portions as regulated by the control equipment and controls responsive to the air temperature at the outlet of the air-to-air heat exchanger to control the louvers and the fans to provide the required outlet temperature of the compressed air from the air-to-air heat exchanger for optimum snow making requirements.

摘要翻译： 一种用于为与冷却空气压缩机结合使用的制雪设备提供压缩空气的系统，包括多个电动机驱动的风扇和位于由每个风扇移动的空气路径的一部分中的加热器线圈组件 ，具有流过其中的液体冷却剂的加热器线圈组件，与加热器线圈组件相邻并且在风扇的空气流动路径中定位的空气 - 空气热交换器，空气 - 空气热交换器与 空气压缩机和制雪设备，并且用于降低从压缩机流向制雪设备的压缩空气的温度，位于空气 - 空气热交换器上方的致动器受控百叶窗，每个风扇有一个百叶窗， 液体冷却盘管组件，其支撑在空气 - 空气热交换器附近并且在单独的空气流动路径中，用于将来自压缩机的冷却液体移动的液体输送泵和作为 组件，其可以是手动控制的阀，用于使冷却剂液体从压缩机通过加热器线圈组件和液体冷却盘管组件，部分由控制设备调节并且响应于空气出口处的空气温度而进行控制， 用于控制百叶窗和风扇以提供空气对空气热交换器的压缩空气所需的出口温度，以达到最佳的制雪要求。