17-01-2019 дата публикации
Номер: US20190017821A1
Принадлежит:
A tilt switch based on differential threshold sensing includes a tilt track (such as a tilt tube), and a tilt/target element moveable along the tilt track by gravity between first/second ends based on tilt angle. An inductive sensor includes first/second sense coils at the ends of the tilt track, and sensor circuitry (a) to drive each sense coil to project a magnetic sensing field, and to measure a differential sensor to a position of the tilt/target element relative to the sense coils, based on a property corresponding to sense coil inductance (for example, relative to a pre-defined switching threshold position), and (b) to provide, in response to the differential sensor response, a tilt switch output corresponding to a tilt angle of the tilt track based on a position of the tilt/target element relative to the sense coils (or switching threshold), for example, with a pre-defined hysteresis. 1. A tilt switch for sensing a tilt condition , comprisinga tilt track with first and second ends;a tilt/target element moveable along the tilt track by gravity between the first and second ends based on a tilt angle of the tilt track; first and second sense coils, respectively located at the first and second ends of the tilt track;', to drive each sense coil to project a respective time-varying magnetic sensing field at a respective first and second end of the tilt track, and', 'to measure a differential sensor response associated with the first and second sense coils to a position of the tilt/target element relative to the first and second sense coils, based on a property corresponding to inductance of each sense coil;, 'sensor circuitry coupled to the first and second sense coils,'}, 'the sensor circuitry to provide, in response to the differential sensor response from the first and second sense coils, a tilt switch output corresponding to a tilt angle of the tilt track based on a position of the tilt/target element relative to the first and second sense coils., 'an inductive ...
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