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公开(公告)号：US11371954B2
公开(公告)日：2022-06-28
申请号：US15936059
申请日：2018-03-26
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Bjoern Oliver Eversmann , Andreas Felix Martin Kraemer , Michael Seidl
Abstract: A capacitance sensing system for sensing frost and ice accumulation. The capacitance sensing system comprises a first capacitor formed by a portion of a metal heat exchanger and a sensor electrode electrically isolated from the metal heat exchanger, a tank oscillator comprising a second capacitor and an inductor connected in parallel with each other and coupled in parallel with the first capacitor, and a circuit coupled to the tank oscillator. The circuit coupled to the tank oscillator is configured to determine a resonant frequency of the tank oscillator, determine a capacitance value based on the resonant frequency of the tank oscillator, determine that the capacitance value is greater than a predefined threshold, and transmit a heater activation command in response to determining the capacitance value is greater than the predefined threshold.
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公开(公告)号：US20220283109A1
公开(公告)日：2022-09-08
申请号：US17750615
申请日：2022-05-23
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Bjoern Oliver EVERSMANN , Andreas Felix Martin Kraemer , Michael Seidl
Abstract: A capacitance sensing system senses frost and ice accumulation in an energy efficient defrost system. The capacitance sensing system comprises a first capacitor including a portion of a metal heat exchanger and a sensor electrode electrically isolated from the metal heat exchanger; a tank oscillator including a second capacitor and an inductor coupled in parallel with each other and with the first capacitor; and a circuit coupled to the tank oscillator. The circuit determines a resonant frequency of the tank oscillator, determines a capacitance value of the first capacitor based on the resonant frequency of the tank oscillator, and transmits a heater activation command in response to determining the capacitance value is greater than a threshold.
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公开(公告)号：US20170060291A1
公开(公告)日：2017-03-02
申请号：US14839308
申请日：2015-08-28
Applicant: Texas Instruments Incorporated
IPC: G06F3/044
CPC classification number: H03K17/96 , H03K17/9505 , H03K17/9537 , H03K2217/96019 , H03K2217/96023 , H03K2217/96038
Abstract: A touch-sensitive glass barrier has a conductive coil affixed to the first side of a glass barrier, a capacitor connected to the conductive coil to form a resonator, and an inductance-to-digital converter (LDC) connected to drive an alternating current through the resonator. The LDC determines whether a conductive target has touched the second side of the glass barrier at a point opposite the conductive coil; and responsive to determining that the conductive target has touched the second side of the glass barrier at the point, provides a signal.
Abstract translation: 触敏玻璃屏障具有固定在玻璃屏障的第一侧上的导电线圈，连接到导电线圈以形成谐振器的电容器和连接以驱动交流电流的电感 - 数字转换器（LDC） 谐振器。 LDC确定在与导电线圈相对的点处导电靶是否已经接触玻璃阻挡层的第二侧; 并且响应于确定所述导电靶已经在所述点触及所述玻璃阻挡层的第二侧，提供信号。
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