Apple Inc.

Spindrift Innovations, LLC

Robert D Zucker

Xiaofeng Wang

Nicola Rasera

Fabio Ongaro

Johan L Piper

Denis M Darmon

Ming Sun

Robert P Weber

A dual differential contactless current sensor uses a pair of magnetic sensors placed adjacent to a conductor, such as a metallic trace on a printed circuit board, which is conducting electrical current. The ability to detect and measure a tampering magnetic field in such a sensor is provided by a circuit that sums the outputs of the pair of magnetic sensors. The circuit can output an alarm signal, such as a programmable one-bit alarm that indicates when the external magnetic field exceeds a programmed threshold, or an analog voltage proportional to the external field. The alarm signal can be polled by additional circuitry that indicates to the stakeholders that a party is attempting to alter the power measurement.

Differential dual sensor contactless magnetic-mode electrical current sensors with tamper detection

Systems and methods for electronic displays to use reference voltages to control driving current of illuminators are provided. The reference voltages are used to reduce or eliminate cross talk in driving voltages among different illuminators and driving voltage variations from frame to frame. The transient performance of the driving current of the illuminator (e.g., the current rise/decline time, current overshoot issue, current settling time) may be improved by implementing the reference voltages.

Method and apparatus for LED driver to reduce cross talk or flicker

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Half Moon Bay, CA, United States of America

Robert D Zucker