公开(公告)号：US5765949A

公开(公告)日：1998-06-16

申请号：US770009

申请日：1996-12-19

申请人： Michel Haddad ,  Al Becker ,  Bakul V. Damle

发明人： Michel Haddad ,  Al Becker ,  Bakul V. Damle

IPC分类号： G01K7/02 ,  G01K7/10

CPC分类号： G01K7/021

摘要： A method and apparatus for reducing the effects of ground loops in a thermocouple measurement device employing a differential amplifier for signal amplification. A resistor is coupled at the input of the differential amplifier to provide a DC ground reference. A capacitor is coupled in parallel to the resistor to compensate for AC noise and prevent the inputs from floating out of common mode range.

摘要翻译： 一种用于降低采用用于信号放大的差分放大器的热电偶测量装置中接地回路的影响的方法和装置。 电阻器耦合在差分放大器的输入端以提供直流接地参考。 电容器并联耦合到电阻器以补偿交流噪声并防止输入浮出共模范围。

公开(公告)号：US06529355B1

公开(公告)日：2003-03-04

申请号：US09605139

申请日：2000-06-27

申请人： Al Becker ,  Bakul Damle

发明人： Al Becker ,  Bakul Damle

IPC分类号： H02H900

CPC分类号： H02H9/025 ,  G01R1/36

摘要： A circuit that protects a current shunt or any analog measuring circuit without the implementation of fuses. In a particular embodiment, a circuit comprises a current shunt and a plurality of transistors that may be configured to function as a fuse. One of the transistors may be deactivated once the input voltage exceeds a negative threshold voltage. The other transistor may be deactivated once the input voltage exceeds a positive threshold voltage. By deactivating the transistors once the input voltage exceeds a negative or a positive threshold voltage, the transistors are configured to function as a fuse and provide input protection for a current shunt or for any analog measuring circuit. In another particular embodiment, a circuit provides protection for a first and second current shunt where the second current shunt is less in resistance than the first current shunt. The circuit further comprises a plurality of transistors that may be configured to function as a fuse. The circuit further comprises a current limiter to protect the second current shunt at a second range and a voltage limiter to protect the current limiter at a first range, where the second range is smaller than the first range. The voltage limiter operates to deactivate the transistors once the input voltage exceeds a negative or positive voltage threshold of the first range. The current limiter operates to limit the current flowing through the transistors once the input voltage exceeds a negative or positive voltage threshold of the second range.

摘要翻译： 保护电流分流器或任何模拟测量电路而不实施保险丝的电路。 在特定实施例中，电路包括电流分流器和可被配置为用作保险丝的多个晶体管。 一旦输入电压超过负阈值电压，晶体管中的一个可以被去激活。 一旦输入电压超过正阈值电压，另一个晶体管可以被去激活。 一旦输入电压超过负阈值电压或正阈值电压，晶体管就被激活，因此晶体管被配置为用作保险丝并为电流分路或任何模拟测量电路提供输入保护。 在另一个具体实施例中，电路为第一和第二电流分路提供保护，其中第二电流分流器的电阻小于第一电流分流器。 电路还包括可被配置为用作保险丝的多个晶体管。 电路还包括限流器，用于保护在第二范围的第二电流分流器和电压限制器，以在第二范围小于第一范围的第一范围内保护限流器。 一旦输入电压超过第一范围的负电压或正电压阈值，电压限制器就操作来去激活晶体管。 一旦输入电压超过第二范围的负电压或正电压阈值，电流限制器操作来限制流过晶体管的电流。

公开(公告)号：US06434965B1

公开(公告)日：2002-08-20

申请号：US09845911

申请日：2001-04-30

申请人： Mike Hughes ,  Al Becker

发明人： Mike Hughes ,  Al Becker

IPC分类号： F25C104

CPC分类号： A23L3/364 ,  F25C1/06 ,  F25C1/08 ,  F25C5/00 ,  F25C5/10 ,  F25D25/00 ,  F25D31/001

摘要： An apparatus for forming a large block of frozen liquid having vertically-disposed heat transfer tubes positioned within an open-bottom, walled mold, and elevator means to raise and lower a platform or a tray to seal with the mold as a bottom to receive and retain the liquid. Once frozen, the block is removed by lowering the platform or tray in a controlled manner.

摘要翻译： 一种用于形成大块冻结液体的装置，其具有定位在开口底部的壁模具内的垂直布置的传热管;以及升降机构件，用于升高和降低平台或托盘以将模具密封为底部以接收和 保留液体。 一旦冻结，通过以受控的方式降下平台或托盘来移除块体。