公开(公告)号：US20190145702A1

公开(公告)日：2019-05-16

申请号：US15809692

申请日：2017-11-10

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Michael SEIDL ,  Bjoern Oliver EVERSMANN

IPC: F25D29/00 ,  F25D23/02 ,  G01M3/00 ,  G01M3/32

Abstract: An apparatus includes a temperature sensor, a pressure sensor, a communication interface, and a hardware controller. The hardware controller may detect a door open and close event for a refrigeration unit and receives temperature readings from the temperature sensor and pressure readings from the pressure sensor. The hardware controller determines whether a performance level of the seal has fallen below a threshold level based on the temperature and pressure readings and transmits a signal through the communication interface responsive to a determination that the performance level of the seal has fallen below the threshold level.

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

IPC: G01N27/22 ,  F25D21/08 ,  F25D21/00 ,  F25D21/02

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.

公开(公告)号：US20190064097A1

公开(公告)日：2019-02-28

申请号：US15936059

申请日：2018-03-26

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Bjoern Oliver EVERSMANN ,  Andreas Felix Martin KRAEMER ,  Michael SEIDL

IPC: G01N27/22 ,  F25D21/00 ,  F25D21/08

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.