公开(公告)号：US09638763B2

公开(公告)日：2017-05-02

申请号：US14585455

申请日：2014-12-30

申请人： Texas Instruments Incorporated

发明人： George P. Reitsma

IPC分类号： G01R33/00 ,  G01R27/28 ,  H03K3/012 ,  H03K17/95 ,  G01D5/20

CPC分类号： G01R33/0023 ,  G01D5/202 ,  G01R27/2611 ,  H03K17/9542

摘要： A resonant impedance sensing system includes a negative impedance control loop incorporating the resonator as a loop filter, and including a class D negative impedance stage implemented with a class D comparator, and a loop control stage implemented with an output comparator clocked (D_clk) by the class D comparator. The class D comparator receives resonator oscillation voltage, and generates a class D switching output synchronized with resonator oscillation frequency. A discrete current source (such as a current DAC) drives the resonator through an H-bridge switched by the class D switching output, so that the time average of the discrete drive current corresponds to resonator oscillation amplitude. Based on resonator oscillation amplitude, the output comparator provides a discrete loop control signal to the discrete current source, driving the resonator with a negative impedance that balances resonant impedance, thereby maintaining constant resonator oscillation amplitude corresponding to steady-state oscillation.

公开(公告)号：US20150077094A1

公开(公告)日：2015-03-19

申请号：US14486575

申请日：2014-09-15

申请人： TEXAS INSTRUMENTS INCORPORATED

发明人： Jonathan V. Baldwin ,  Murali Srinivasa

IPC分类号： G01B7/00 ,  H03H5/02 ,  H03M1/12

CPC分类号： G01B7/003 ,  G01D5/20 ,  H03H5/02 ,  H03K17/9542 ,  H03K17/972 ,  H03K2017/9706 ,  H03M1/12

摘要： An inductive sensing system includes multiple resonant sensors interfaced to an inductance-to-digital conversion (IDC) unit through a single channel interface. IDC establishes an IDC control loop that incorporates resonant sensors as loop filters. The IDC control loop drives resonant sensors to a system resonance state in which each resonant sensor is driven to a resonant frequency state. Each resonant sensor is configured for a nominal resonant frequency state that differentiates it from the other resonant sensors. IDC senses changes in system resonance state representative of target-sensing conditions, and responds by driving a target-sensing system resonance state. IDC converts IDC loop (resonance) control signals resulting from a target-sensing condition into sensor data as representing the corresponding target-sensing resonant frequency state as an indication of target position (proximity or range) relative to a target-sensing resonant sensor. The sensor data can be provided to a data processor for proximity/range processing.

摘要翻译： 电感式感测系统包括通过单通道接口与电感数字转换（IDC）单元相连接的多个谐振传感器。 IDC建立了一个IDC控制回路，它将谐振传感器作为环路滤波器。 IDC控制回路将谐振传感器驱动到系统谐振状态，其中每个谐振传感器被驱动到谐振频率状态。 每个谐振传感器被配置为将其与其他谐振传感器区分开的标称谐振频率状态。 IDC感测代表目标感测条件的系统共振状态的变化，并通过驱动目标感测系统共振状态来进行响应。 IDC将由目标检测条件产生的IDC循环（共振）控制信号转换为传感器数据，作为相应的目标感测共振频率状态，作为相对于目标感测谐振传感器的目标位置（接近度或范围）的指示。 传感器数据可以提供给数据处理器以进行接近/距离处理。

公开(公告)号：US3536937A

公开(公告)日：1970-10-27

申请号：US3536937D

申请日：1966-08-18

申请人： OMRON TATEISI ELECTRONICS CO

发明人： UEMURA MIKIO ,  TAKECHI SABURO ,  IIO KENZI

IPC分类号： H03K17/723 ,  H03K17/95 ,  H03K17/97 ,  H03K17/00

CPC分类号： H03K17/723 ,  H03K17/9525 ,  H03K17/9542 ,  H03K17/97 ,  H03K2017/9706

公开(公告)号：US20160139197A1

公开(公告)日：2016-05-19

申请号：US14899839

申请日：2014-05-26

申请人： ZF FRIEDRICHSHAFEN AG

发明人： Thomas LUBER

IPC分类号： G01R31/28 ,  G01R23/02

CPC分类号： G01R31/2836 ,  G01R23/02 ,  H03K17/953 ,  H03K17/9542

摘要： A circuitry comprises at least one oscillating circuit section, wherein the circuit section comprises a circuit component, which can be affected by the external influence such that an oscillation behavior of the circuit section can be altered by the external influence. The circuitry is furthermore designed thereby to determine the oscillation behavior of the circuit section by a sampling at numerous defined frequencies. As a result, it may be possible to improve a compromise regarding the production and implementation of such a circuitry.

摘要翻译： 电路包括至少一个振荡电路部分，其中电路部分包括电路部件，其可受到外部影响的影响，从而可以通过外部影响改变电路部分的振荡特性。 此外设计电路，从而通过在许多定义的频率下的采样来确定电路部分的振荡特性。 结果，可能改善关于这种电路的生产和实现的折衷。

公开(公告)号：US20150185294A1

公开(公告)日：2015-07-02

申请号：US14585455

申请日：2014-12-30

申请人： Texas Instruments Incorporated

发明人： George P. Reitsma

IPC分类号： G01R33/00 ,  H03K3/012

CPC分类号： G01R33/0023 ,  G01D5/202 ,  G01R27/2611 ,  H03K17/9542

摘要： A resonant impedance sensing system includes a negative impedance control loop incorporating the resonator as a loop filter, and including a class D negative impedance stage implemented with a class D comparator, and a loop control stage implemented with an output comparator clocked (D_clk) by the class D comparator. The class D comparator receives resonator oscillation voltage, and generates a class D switching output synchronized with resonator oscillation frequency. A discrete current source (such as a current DAC) drives the resonator through an H-bridge switched by the class D switching output, so that the time average of the discrete drive current corresponds to resonator oscillation amplitude. Based on resonator oscillation amplitude, the output comparator provides a discrete loop control signal to the discrete current source, driving the resonator with a negative impedance that balances resonant impedance, thereby maintaining constant resonator oscillation amplitude corresponding to steady-state oscillation.

摘要翻译： 谐振阻抗感测系统包括将谐振器作为环路滤波器并入的负阻抗控制回路，并且包括用D类比较器实现的D级负阻抗级，以及由输出比较器（D_clk）由 D类比较器。 D类比较器接收谐振器振荡电压，并产生与谐振器振荡频率同步的D类开关输出。 离散电流源（例如电流DAC）通过由D类开关输出切换的H桥驱动谐振器，使得分立驱动电流的时间平均对应于谐振器振荡幅度。 基于谐振器振荡幅度，输出比较器为离散电流源提供离散环路控制信号，以平衡谐振阻抗的负阻抗驱动谐振器，从而保持与稳态振荡相对应的恒定的谐振器振荡幅度。

公开(公告)号：US20110316560A1

公开(公告)日：2011-12-29

申请号：US13144880

申请日：2010-01-18

申请人： John Francis Gregg ,  Alexy Davison Karenowska

发明人： John Francis Gregg ,  Alexy Davison Karenowska

IPC分类号： G01R27/28

CPC分类号： H03B5/1805 ,  H03B5/1817 ,  H03K17/9542

摘要： A self-oscillating remote sensor device includes a delay-line sensor system having at least one delay-line and at least one sensor element. The device also includes an oscillator control circuitry, and a frequency selection impedance connecting the delay-line sensor system and the oscillator control circuitry and presenting an impedance to the delay-line sensor system. The oscillator control circuitry includes an amplifier, a non linear amplitude control element (N-LACE) such as an active device with a negative differential conductance that provides an output whose amplitude has a negative second derivative with respect to an input signal, and a driver. Such a device permits successful interaction between electrical sensors and controlling (driving) electronics over long distances without the problems normally encountered when a delay-line is presented between an electrical sensor and its driver electronics.

摘要翻译： 自振荡远程传感器装置包括具有至少一个延迟线和至少一个传感器元件的延迟线传感器系统。 该装置还包括振荡器控制电路和连接延迟线传感器系统和振荡器控制电路并向延迟线传感器系统呈现阻抗的频率选择阻抗。 振荡器控制电路包括放大器，非线性幅度控制元件（N-LACE），例如具有负差分电导的有源器件，其提供其幅度相对于输入信号具有负二阶导数的输出，以及驱动器 。 这种设备允许电传感器和长距离控制（驱动）电子设备之间成功的相互作用，而没有在电传感器和其驱动器电子器件之间呈现延迟线时通常遇到的问题。

公开(公告)号：US20060061351A1

公开(公告)日：2006-03-23

申请号：US10936935

申请日：2004-09-09

申请人： Weihua Chen ,  Saeed Shafiyan-Rad

发明人： Weihua Chen ,  Saeed Shafiyan-Rad

IPC分类号： G01R11/02

CPC分类号： H03K17/9542 ,  H03K17/9502 ,  H03K17/954

摘要： An apparatus includes a sense element and an oscillator. The oscillator is coupled to the sense element and is used to generate an oscillator signal and a gain control signal. The oscillator signal is amplitude compensated when noise is detected in the sense element. A method includes detecting magnetic interference in a sense element coupled to an oscillator, and adjusting a gain control signal in the oscillator to compensate for the magnetic interference.

摘要翻译： 一种装置包括感测元件和振荡器。 振荡器耦合到感测元件，并用于产生振荡器信号和增益控制信号。 当在感测元件中检测到噪声时，振荡器信号进行幅度补偿。 一种方法包括检测耦合到振荡器的感测元件中的磁干扰，以及调整振荡器中的增益控制信号以补偿磁干扰。

公开(公告)号：US20180004298A1

公开(公告)日：2018-01-04

申请号：US15545554

申请日：2016-01-22

申请人： TEXAS TECH UNIVERSITY SYSTEM

发明人： Chenhui Liu ,  Changzhi Li ,  Changzhan Gu

IPC分类号： G06F3/01 ,  H02J50/12 ,  H02J7/02 ,  H03K17/95

CPC分类号： G06F3/017 ,  H02J7/025 ,  H02J50/12 ,  H03K17/9542

摘要： Disclosed is a system and method for controlling handheld devices without contact by interacting with their wireless charging coils or other inductive coil antennae. The present disclosure utilizes the interaction between human body and the coil wherein the coil is used to send alternating magnetic field to interact with a control signal, such as a hand, instead of simply using the coil in the smart phone as a power receiver. The hand movement in front of the wireless charging coil changes the coil's conductivity distribution, which creates effective coil impedance also known as reflected impedance.

公开(公告)号：US09638651B2

公开(公告)日：2017-05-02

申请号：US14627245

申请日：2015-02-20

申请人： Pepperl + Fuchs GmbH

发明人： Roland Seefried

IPC分类号： G01N27/02

CPC分类号： G01N27/025 ,  H03K17/9512 ,  H03K17/954 ,  H03K17/9542

摘要： A method for measuring a physical quantity with a, particularly inductive, sensor element and for providing a sensor output depending on the physical quantity. The sensor element is part of a resonant circuit whose attenuation depends on the physical quantity being measured. The resonant circuit is excited to generate a periodic oscillation signal, the amplitude of which depends on the attenuation. The oscillation signal is compared with a comparator threshold value in a comparator to produce a periodic comparator signal with a duty cycle depending on the comparator threshold value. The comparator threshold value is set to be different from a mean value of the oscillation signal so that a duty cycle different from 50% is achieved. The sensor output is output depending on the duty cycle of the comparator signal.

公开(公告)号：US20150233853A1

公开(公告)日：2015-08-20

申请号：US14627245

申请日：2015-02-20

申请人： Pepperl + Fuchs GmbH

发明人： Roland SEEFRIED

IPC分类号： G01N27/02

CPC分类号： G01N27/025 ,  H03K17/9512 ,  H03K17/954 ,  H03K17/9542

摘要： A method for measuring a physical quantity with a, particularly inductive, sensor element and for providing a sensor output depending on the physical quantity. The sensor element is part of a resonant circuit whose attenuation depends on the physical quantity being measured. The resonant circuit is excited to generate a periodic oscillation signal, the amplitude of which depends on the attenuation. The oscillation signal is compared with a comparator threshold value in a comparator to produce a periodic comparator signal with a duty cycle depending on the comparator threshold value. The comparator threshold value is set to be different from a mean value of the oscillation signal so that a duty cycle different from 50% is achieved. The sensor output is output depending on the duty cycle of the comparator signal.

摘要翻译： 一种用特别感性的传感器元件测量物理量的方法，用于根据物理量提供传感器输出。 传感器元件是谐振电路的一部分，其衰减取决于被测量的物理量。 谐振电路被激励以产生周期性振荡信号，其振幅取决于衰减。 将振荡信号与比较器中的比较器阈值进行比较，以产生具有取决于比较器阈值的占空比的周期性比较器信号。 将比较器阈值设定为与振荡信号的平均值不同，从而实现与50％不同的占空比。 传感器输出根据比较器信号的占空比输出。