Inductive non-contact resistance measurement
First Claim
1. An electronic device, comprising:
- a coil;
a sensing circuit configured to generate an oscillating electrical signal on the coil for performing inductive sensing;
a charging circuit configured to receive power from the coil while the coil is inductively coupled to an external charging device; and
selection logic configured to selectively couple the coil to one of the sensing circuit and the charging circuit.
2 Assignments
0 Petitions
Accused Products
Abstract
Embodiments herein describe a user device that includes a dual purpose coil (or inductor) used when performing inductive sensing and when transferring electrical power to the user device. When performing inductive sensing, the user device couples the coil to a sensing circuit which measures a resistivity of a lossy material inductively coupled to the coil. In one embodiment, the user device may be worn on the wrist of the user so that the sensing circuit measures the resistivity corresponding to the flow of blood in an artery or vein. By monitoring changes in the resistivity of the blood or artery, the user device can identify the heartbeat of the user. When transferring electrical power, the user device couples the coil to a charging circuit which receives the power provided by an external charging device that is inductively coupled to the coil.
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Citations
20 Claims
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1. An electronic device, comprising:
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a coil; a sensing circuit configured to generate an oscillating electrical signal on the coil for performing inductive sensing; a charging circuit configured to receive power from the coil while the coil is inductively coupled to an external charging device; and selection logic configured to selectively couple the coil to one of the sensing circuit and the charging circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An integrated circuit, comprising:
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a sensing circuit configured to generate an oscillating electrical signal on a coil for performing inductive sensing; a charging circuit configured to receive power from the coil while the coil is inductively coupled to an external charging device; and selection logic configured to selectively couple the coil to one of the sensing circuit and the charging circuit. - View Dependent Claims (11, 12, 13, 14)
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15. A method, comprising:
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coupling a coil to a sensing circuit, the sensing circuit generating an oscillating electrical signal on the coil for performing inductive sensing; and coupling the coil to a charging circuit, the charging circuit receiving power from the coil while the coil is inductively coupled to an external charging device. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification