公开(公告)号：US5619137A

公开(公告)日：1997-04-08

申请号：US600380

申请日：1996-02-12

申请人： Ravi Vig ,  Teri Tu ,  Paul W. Latham, II

发明人： Ravi Vig ,  Teri Tu ,  Paul W. Latham, II

IPC分类号： G01R33/07 ,  H03K3/0233 ,  G01R33/06 ,  G01R33/025 ,  H03K3/38

CPC分类号： G01R33/07 ,  H03K3/02337

摘要： A low power magnetic-field detector, of the kind for detecting an ambient magnetic field that is greater than a predetermined field strength, is comprised of a Hail element, a transducer-voltage amplifier, and a zero-crossing comparator, all connected in tandem. A clock and switch are used to chop the energizing current to the Hall element. Alternatively, the amplifier and comparator are also chopped to further reduce power consumption. A clockable flip flop is synchronously enabled for an instant at the end of each period of energizing the Hall element. The comparator output signal is transferred to the flip flop Q output and held there during each period of not energizing the Hall element. A Positive-feedback hysteresis circuit adds a bias voltage to the amplified Hall voltage and is applied to the comparator input to effect comparator hysteresis with memory covering clock-period portions when the Hall element is not energized. The comparator is thus transformed into a Schmitt trigger circuit having hysteresis memory, making it possible to chop the Hall element to substantially reduce the detector power consumption without loosing the hysteresis feature.

摘要翻译： 用于检测大于预定场强的环境磁场的低功率磁场检测器由Hail元件，传感器电压放大器和过零比较器组成，全部以串联方式连接 。 时钟和开关用于将激励电流切断到霍尔元件。 或者，放大器和比较器也被切碎以进一步降低功耗。 时钟触发器在霍尔元件通电的每个周期结束时立即同时使能。 比较器输出信号被传送到触发器Q输出并且在不给霍尔元件通电的每个周期期间保持在其中。 正反馈迟滞电路向放大的霍尔电压增加偏置电压，并将其施加到比较器输入，以在霍尔元件未通电时覆盖时钟周期部分的存储器来实现比较器滞后。 因此，比较器被转换成具有滞后存储器的施密特触发电路，使得可以将霍尔元件切断以显着降低检测器的功耗，而不会失去滞后特性。

公开(公告)号：US5517112A

公开(公告)日：1996-05-14

申请号：US335276

申请日：1994-11-07

申请人： Ravi Vig ,  Jacob K. Higgs

发明人： Ravi Vig ,  Jacob K. Higgs

IPC分类号： G01D3/032 ,  G01D5/14 ,  G01D5/244 ,  G01R33/07 ,  H03K17/95 ,  H01H36/00 ,  H03K5/1252

CPC分类号： G01D5/24476 ,  G01D3/032 ,  G01D5/145 ,  G01R33/07 ,  H03K17/9517 ,  Y10T307/766

摘要： There is added to a conventional magnetic-field detector, which includes a magnetic-field-to-voltage transducer such as a Hall element connected to a Schmitt trigger circuit, a DC voltage monitor circuit to produce a high binary monitor signal only when the DC supply voltage is within a predetermined normal band, and a logic circuit having one input connected to the output of the monitor circuit and a second input connected to the output of the Schmitt trigger circuit. During periods when the binary-Schmitt-output voltage remains high, corresponding for example to a high ambient magnetic field, noise spikes on the DC line can cause an anomalous change in the binary-Schmitt-output voltage of a magnetic-field detector from a high level to a low level. The logic circuit is such that during an enabling period in which the output signal from the DC supply voltage monitor is continuously of the one type, the logic output produces a binary logic output-signal transition from a first binary level to the second binary level only following a transition in the Schmitt output signal from the high level to the low level, so that in the presence of noise spikes of either polarity that momentarily cause the DC supply voltage to exit the predetermined normal DC supply voltage band, the binary logic output signal essentially mirrors the Schmitt output signal with noise removed.

摘要翻译： 添加到传统的磁场检测器中，其包括诸如连接到施密特触发电路的霍尔元件之类的磁场 - 电压传感器，直流电压监视电路仅在DC 电源电压在预定的正常频带内，并且具有连接到监视电路的输出的一个输入端和连接到施密特触发电路的输出的第二输入的逻辑电路。 在二进制施密特输出电压保持为高电平的情况下，例如对应于高环境磁场，直流线路上的噪声尖峰可能导致磁场检测器的二进制施密特输出电压的异常变化 高水平到低水平。 逻辑电路使得在来自DC电源电压监视器的输出信号连续为一种类型的使能期间内，逻辑输出产生仅从第一二进制电平到第二二进制电平的二进制逻辑输出信号转换 在施密特输出信号从高电平转换到低电平之后，使得在存在瞬时使直流电源电压退出预定的正常直流电源电压带的任一极性的噪声尖峰的情况下，二进制逻辑输出信号 基本上镜像了去除了噪声的施密特输出信号。

公开(公告)号：US5218298A

公开(公告)日：1993-06-08

申请号：US844076

申请日：1992-03-02

申请人： Ravi Vig

发明人： Ravi Vig

IPC分类号： G01R33/07

CPC分类号： G01R33/07

摘要： A magnetic-field monitor includes a Hall sensor of the kind having a voltage reference terminal and a signal output terminal for being energized by applying a DC voltage across the output terminal and the reference terminal, and generates through the output terminal a low value current when the ambient magnetic field strength is low and a high output current when the magnetic field is high. The Hall sensor is connected via a pair of conductors to a Hall-sensor decoder circuit that is energized by a DC voltage source and in turn energizes the sensor via the pair of conductors. The decoder includes a current mirror circuit that mirrors the Hall-sensor current into a voltage divider. Three voltage comparators having different threshold voltages are connected at three points in the voltage divider. The three binary output signals of the comparators constitute a composite binary indication whether a short circuit fault or an open circuit fault condition exists in the conductors connecting the Hall element to the decoder, and when there is no fault further indicates whether the ambient magnetic field at the remote Hall sensor is high or low. A system including four such monitors is described wherein the fault signals are combined and the real time indication of the magnetic-field status at each remote sensor is continuously provided.

摘要翻译： 磁场监视器包括具有参考电压端子的霍尔传感器和通过在输出端子和参考端子上施加直流电压而被激励的信号输出端子，并且通过输出端子产生低电流值 当磁场高时，环境磁场强度低，输出电流高。 霍尔传感器通过一对导体连接到霍尔传感器解码器电路，由霍尔传感器解码电路通过直流电压源激励，然后通过一对导体激励传感器。 解码器包括将霍尔传感器电流反射成分压器的电流镜电路。 具有不同阈值电压的三个电压比较器在分压器的三个点连接。 比较器的三个二进制输出信号构成复合二进制指示，连接霍尔元件到解码器的导体中是否存在短路故障或开路故障状况，当没有故障进一步指示环境磁场是否在 遥控霍尔传感器高或低。 描述包括四个这样的监视器的系统，其中组合故障信号，并且连续提供每个远程传感器处的磁场状态的实时指示。

公开(公告)号：US5045920A

公开(公告)日：1991-09-03

申请号：US545168

申请日：1990-06-28

申请人： Ravi Vig ,  Daniel P. Demingware ,  Aung T. Tu

发明人： Ravi Vig ,  Daniel P. Demingware ,  Aung T. Tu

IPC分类号： G01V3/08 ,  H01L43/06

CPC分类号： H01L43/065 ,  G01V3/08

摘要： A ferrous article proximity sensor package includes a dual Hall element IC chip mounted at the end of a magnet. The axis of the chip, defined as being orthogonal to the chip face and equidistant the two Hall elements, is coaxial with the outer wells of the package but spaced away from the axis of the magnet. That exact position is such that the resulting difference in magnetic field strength at the two Hall elements is just enough to compensate for all the other factors that lead to an unwanted offset voltage in the sensor output. This package is made of two mating parts, one containing the magnet being eccentric with respect to the chip axis and the other containing the chip just above one magnet pole end. To achieve the abovedescribed desired offset condition in manufacturing, the one package part is simply rotated with the magnet relative to and within the other package part until the desired condition is met, and the two parts fastened together in that position.

摘要翻译： 铁类物品接近传感器封装包括安装在磁体末端的双霍尔元件IC芯片。 芯片的轴线定义为与芯片表面正交并等距离的两个霍尔元件，与封装的外部孔同轴，但与磁体的轴线间隔开。 该精确位置使得两个霍尔元件处产生的磁场强度的差异刚好足以补偿导致传感器输出中不期望的偏移电压的所有其它因素。 该包装由两个配合部件组成，一个包含相对于芯片轴线偏心的磁体，另一个包含位于一个磁极端部上方的芯片。 为了在制造中实现上述所期望的偏移条件，一个包装部分被简单地与磁体相对于并在其它包装部分内旋转，直到满足期望的条件，并且两个部件在该位置固定在一起。