Magnetic field detector
First Claim
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1. A magnetic field detector comprising:
- a source of voltage;
a coil containing a core and connected to said source of voltage;
means connected to said coil and to said source of voltage for charging said coil with voltage from said source of voltage for a defined period of time and for subsequently discharging said coil, said coil having a discharge time associated therewith; and
magnetic field indicator means for measuring said discharge time of said coil and for generating a detection signal indicating a presence of a magnetic field in which said coil is disposed if said discharge time is less than a defined time threshold value.
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Abstract
In a magnetic field detector as well as in a combined telemetry and magnetic field detector unit in a medical implant, a magnetic field sensor with a coil and a diode are employed for determining the presence of a magnetic field. For making such a determination, the coil is charged by a source of voltage for a defined period of time, the time for the discharge of the coil through the diode depending on whether a magnetic field is present. A detection signal indicating the presence of a magnetic field is generated if the discharge time is less than a defined time threshold value.
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Citations
8 Claims
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1. A magnetic field detector comprising:
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a source of voltage; a coil containing a core and connected to said source of voltage; means connected to said coil and to said source of voltage for charging said coil with voltage from said source of voltage for a defined period of time and for subsequently discharging said coil, said coil having a discharge time associated therewith; and magnetic field indicator means for measuring said discharge time of said coil and for generating a detection signal indicating a presence of a magnetic field in which said coil is disposed if said discharge time is less than a defined time threshold value. - View Dependent Claims (2, 3, 4, 5)
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6. A magnetic field detector comprising:
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a source of voltage; a coil containing a core and connected to said source of voltage; means connected to said coil and to said source of voltage for charging said coil with voltage from said source of voltage until reaching a predetermined charging level and for subsequently discharging said coil, said coil having a discharging time associated therewith; and magnetic field indicator means for measuring said charging time of said coil and for generating a detection signal indicating a presence of a magnetic field in which said coil is disposed if said discharging time exceeds a defined time threshold value. - View Dependent Claims (7, 8)
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Specification