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US 7,382,636 B2Granted
System and method for powering a load
AssigneeAccess Business Group International LLC
InventorsDavid W. Baarman, John J. Lord, Wesley J. Bachman
Life of this patent
Estimating the term…
Abstract
A power supply for inductively powering a remote device has an inverter operating at an operating frequency and a primary coil. A phase comparator compares the phase of the voltage or current delivered by the power supply. If the phase relationship detected by the comparator is unacceptable, the inverter is disabled. After a period of time, the inverter is re-enabled, and the phase relationship is again determined.
Claims17
A circuit for powering a remote device comprising:
- an inverter operating at the operating frequency;
- a tank circuit including a capacitor and an inductor for transferring power to the remote device;
- a phase comparator for comparing the phase of the voltage supplied to the tank circuit with the phase of the voltage between the capacitor and the inductor of the tank circuit and generating a first phase comparison;
- and
- a disabling means for disabling the inverter as a function of the first phase comparison.
2 more elements
A method of operating a circuit comprising:
- operating an inverter at a first frequency to power a tank circuit including a capacitor and an inductor;
- determining a first operating phase of the inverter;
- determining a first operating phase of the voltage between the capacitor and the inductor of the tank circuit;
- comparing the first operating phase of the inverter to the first operating phase of the voltage between the capacitor and the inductor of the tank circuit to generate a first comparison;
- and
- disabling the inverter in response to the first comparison.
3 more elements
Dependencies are inferred from the claim text.