公开(公告)号：US4683754A

公开(公告)日：1987-08-04

申请号：US857045

申请日：1986-04-29

申请人： Terutaka Hirata ,  Tadashi Azegami ,  Atsushi Kimura ,  Megumi Katayama

发明人： Terutaka Hirata ,  Tadashi Azegami ,  Atsushi Kimura ,  Megumi Katayama

IPC分类号： G01D5/24 ,  G01L9/00 ,  G01L9/12 ,  G01L19/04

CPC分类号： G01L9/0072 ,  G01L9/125

摘要： A capacitive displacement type transducer, wherein the oscillation frequency of a self-excited oscillator circuit including a pair of differential capacitors formed with a movable electrode disposed between two outer electrodes is counted by a counter, the output level of the counter is reversed each time a certain count is attained to cause the differential capacitances to be switched alternatively, and to make identical the respective reversal periods, and application voltage to be applied to the differential capacitors being controlled by an integrator, and a voltage relating to the output of the integrator being applied through a fixed impedance to the movable electrode, thereby eliminating fixed capacitances formed across the difference capacitors. Also, a voltage generated by dividing and averaging the output level of the counter by use of a certain pulse duration of a monostable circuit operating in synchronism with a counter, is used to compensate for static pressure changes. Also, a temperature sensing element is included in a converting section to perform temperature correction. The circuit may be used in a two wire transmission system. The circuit improves upon the prior art by eliminating heretofore used complex circuits, thereby increasing reliability, efficiency and reducing size.

摘要翻译： 一种电容式位移式换能器，其中包括由设置在两个外部电极之间的可动电极形成的一对差动电容器的自激振荡器电路的振荡频率由计数器计数，每次计数器的输出电平反转 达到某些计数以使差分电容被交替切换，并使各个反转周期相同，并且施加到由积分器控制的差分电容器的施加电压，并且与积分器的输出相关的电压为 通过固定阻抗施加到可动电极，从而消除形成在差分电容器两端的固定电容。 而且，使用通过使用与计数器同步运行的单稳态电路的特定脉冲持续时间对计数器的输出电平进行分频和平均而产生的电压来补偿静态压力变化。 此外，温度感测元件包括在转换部分中以执行温度校正。 该电路可用于双线传输系统中。 该电路通过消除以前使用的复杂电路来改进现有技术，从而提高可靠性，效率和减小尺寸。

公开(公告)号：US4644798A

公开(公告)日：1987-02-24

申请号：US770664

申请日：1985-08-28

申请人： Hisashi Tamura ,  Terutaka Hirata ,  Tetsu Odohira ,  Tadahiro Ogawa

发明人： Hisashi Tamura ,  Terutaka Hirata ,  Tetsu Odohira ,  Tadahiro Ogawa

IPC分类号： G01D5/24 ,  G01L9/00 ,  G01L9/12 ,  G01L7/08 ,  C08C19/10 ,  G01L19/04

CPC分类号： G01L9/0075 ,  G01L9/125

摘要： A capacitive type converter device, such as used for measuring pressure, comprising first and second rectifying circuits, each including an operational amplifier with a non-inverting input terminal connected to a reference point, to which a variable condenser is connected, the variable condenser having a capacitance which varies in response to a force being measured, such as pressure, and to which a reference condenser is connected, the reference condenser having a capacitance which is fixed independent of the force being measured. The device further comprises an oscillator, whose oscillation output is applied to the variable and reference condensers,and which is controlled by a control means in response to output of the first rectifying circuit, or in response to the output of the second rectifying circuit together with the output of the first rectifying circuit, whereby an output responsive to the capacitance of the variable condenser is obtained from the output of the second rectifying circuit, or an output relating to the difference between the capacitances of the condensers is obtained from the outputs of the first and second rectifying circuits. The device eliminates adverse influences of stray capacitances, non-linearity, offset signals, and parallel capacitances and forward voltages.

摘要翻译： 一种诸如用于测量压力的电容型转换器装置，包括第一和第二整流电路，每个包括具有连接到可变电容器的参考点的非反相输入端的运算放大器，可变冷凝器具有 响应于被测量的力例如压力而变化的电容，参考电容器连接到其上，参考电容器具有独立于被测量的力而固定的电容。 该装置还包括振荡器，其振荡输出被施加到可变和参考电容器，并且响应于第一整流电路的输出而由控制装置控制，或者响应于第二整流电路的输出连同 第一整流电路的输出，从第二整流电路的输出获得响应于可变电容器的电容的输出，或者从电容器的电容之间的差异获得与电容器的电容之间的差异的输出 第一和第二整流电路。 该器件消除杂散电容，非线性，偏移信号，并联电容和正向电压的不利影响。

公开(公告)号：US4800759A

公开(公告)日：1989-01-31

申请号：US91219

申请日：1987-08-31

申请人： Terutaka Hirata ,  Tetsu Odohira ,  Tadashi Nishikawa

发明人： Terutaka Hirata ,  Tetsu Odohira ,  Tadashi Nishikawa

IPC分类号： G01L9/06 ,  G01L7/08 ,  G01L19/04

CPC分类号： G01L9/065

摘要： A semiconductor pressure converter wherein a drive voltage is applied to a power supply end of a shearing type gage formed at the strain generating part of a semiconductor diaphragm, and an output voltage appearing at the output end thereof is amplified with an amplifier. The zero point is adjusted by applying a bias voltage to the amplifier which is related to the drive voltage. The span is adjusted without interference to the zero point by changing the feedback voltage of the amplifier. Linear compensation, temperature zero point compensation and temperature span compensation are attained without any mutual interference.

摘要翻译： 一种半导体压力转换器，其中驱动电压被施加到形成在半导体膜片的应变发生部分的剪切型计量器的电源端，并且其输出端出现的输出电压用放大器放大。 通过将偏置电压施加到与驱动电压相关的放大器来调整零点。 通过改变放大器的反馈电压来调节量程而不影响零点。 实现线性补偿，温度零点补偿和温度范围补偿，没有任何相互干扰。