Tire pressure sensor with self-contained power generator
First Claim
Patent Images
1. A tire pressure sensor, comprising:
- a spool;
a pole piece within the spool;
a magnet placed adjacent to an end of the pole piece;
a coil wound around the spool;
a rectifier circuit connected to the coil;
a capacitor connected to the rectifier circuit; and
an air pressure sensing element electrically connected to the capacitor and receiving power therefrom.
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Abstract
A tire pressure sensor with power generator includes a spool having a coil wound therearound. Within the spool is a pole piece. The tire pressure sensor is installed in a wheel that rotates with respect to a brake clamp. The brake clamp includes a magnetic strip that the sensor moves past as the wheel rotates. As the tire pressure sensor moves past the brake clamp, the magnetic strip causes the coil to output an AC voltage signal. A rectifier circuit connected to the coil converts the AC voltage to DC voltage. The DC voltage is stored in a storage capacitor to be used as needed by an air pressure sensing element connected thereto.
11 Citations
17 Claims
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1. A tire pressure sensor, comprising:
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a spool;
a pole piece within the spool;
a magnet placed adjacent to an end of the pole piece;
a coil wound around the spool;
a rectifier circuit connected to the coil;
a capacitor connected to the rectifier circuit; and
an air pressure sensing element electrically connected to the capacitor and receiving power therefrom. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wheel assembly, comprising:
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a wheel;
a tire circumscribing the wheel; and
a tire pressure sensor installed within the wheel such that it communicates with air within the tire, the tire pressure sensor including an air pressure sensing element, and a rechargeable capacitor providing power to the air pressure sensing element. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A tire pressure sensor installed in a wheel having a tire disposed therearound, comprising:
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means for generating alternating current voltage as the wheel rotates;
means for converting the AC voltage to DC voltage connected to the generating means;
means for storing the DC voltage connected to the converting means; and
means for determining the air pressure within the tire receiving power from the storing means. - View Dependent Claims (16, 17)
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Specification