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US 2010/0073093 A1Published application
Automatic Frequency Compensation for Pulse Width Modulated RF Level Control
AssigneeAmeritherm, Inc.
InventorIan Alan PAULL
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Abstract
Preferred embodiments of the present invention provide systems and methods that automatically correct the desired on-time of switching elements as the resonant frequency changes, so as to maintain the correct proportional value.
Claims1
A method for automatically allocating to switching devices an on-time that is proportional to a cycle time, comprising:
- using a voltage controlled oscillator to output a first signal having a frequency that corresponds to a tune voltage;
- using a voltage controlled current source to charge a charge accumulating circuit by outputting a current that corresponds to the tune voltage or a scaled tune voltage;
- using a comparator that generates a second signal by comparing a voltage of the charge accumulating circuit to a pre-determined set point;
- and
- using a circuit configured to receive the first signal and the second signal to output a third signal that is a function of the first signal and the second signal,
- wherein the output of said circuit is coupled to the switching devices.
3 more elements
Dependencies are inferred from the claim text.