Device and method for generating an electrical power supply in an electronic system with a variable reference potential
First Claim
1. An apparatus for touch and proximity detection, comprising:
- an integrated circuit including;
a first electronic system, electrically referenced to a guard potential, configured for capacitively detecting one or more objects at one or more capacitive electrodes; and
a second electronic system, distinct from the first electronic system and electrically referenced to a ground potential, and connected to the first electronic system by decoupling circuitry, wherein the ground potential is different from the guard potential; and
excitation circuitry connected to the guard and ground potentials so as to impose an AC voltage difference between these potentials,wherein;
the decoupling circuitry is configured for communicatively coupling the first electronic system and the second electronic system while maintaining isolation between the guard potential and the ground potential, andthe excitation circuitry comprises;
an AC voltage supply source referenced to the ground potential and configured for generating an AC voltage; and
voltage supply circuitry referenced to the guard potential and configured for receiving the AC voltage from the AC voltage supply source and generating a supply voltage for the first electronic system referenced to the guard potential.
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Abstract
A method and device for generating a power supply voltage, referenced to a first reference potential, in an electronic system including an energizing source connected to the first and second reference potentials so as to impart an AC voltage differential between the reference potentials, wherein the device includes: (i) a source for supplying AC voltage, which is referenced to the second reference potential, connected to the first reference potential, and encompasses the energizing source; and (ii) rectifying and filtering elements connected, at the input thereof, to the first reference potential and to the source for supplying AC voltage, respectively, so as to generate, at an output, a power supply voltage (Vf) referenced to the first reference potential by rectifying a voltage at the terminals of the source for supplying AC voltage.
256 Citations
16 Claims
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1. An apparatus for touch and proximity detection, comprising:
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an integrated circuit including; a first electronic system, electrically referenced to a guard potential, configured for capacitively detecting one or more objects at one or more capacitive electrodes; and a second electronic system, distinct from the first electronic system and electrically referenced to a ground potential, and connected to the first electronic system by decoupling circuitry, wherein the ground potential is different from the guard potential; and excitation circuitry connected to the guard and ground potentials so as to impose an AC voltage difference between these potentials, wherein; the decoupling circuitry is configured for communicatively coupling the first electronic system and the second electronic system while maintaining isolation between the guard potential and the ground potential, and the excitation circuitry comprises; an AC voltage supply source referenced to the ground potential and configured for generating an AC voltage; and voltage supply circuitry referenced to the guard potential and configured for receiving the AC voltage from the AC voltage supply source and generating a supply voltage for the first electronic system referenced to the guard potential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for touch and proximity detection, comprising:
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referencing a first electronic system to a guard potential; referencing a second electronic system to a ground potential, different than the guard potential, and communicatively coupling the second electronic system to the first electronic system while maintaining isolation between the guard potential and the ground potential; capacitively detecting one or more objects at one or more capacitive electrodes using the first electronic system; and maintaining an AC voltage difference between the guard potential and the ground potential, including; generating an AC voltage referenced to the ground potential; and using the AC voltage to generate a supply voltage for the first electronic system referenced to the guard potential. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification