Enhanced Lossless Current Sense Circuit
AssigneeCovidien LP
InventorRobert B. Smith
Life of this patent
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Abstract
A switched inductor system is provided that includes a switching regulator configured to receive an input signal and provide a voltage output, the switching regulator having one or more switches and one or more inductors. The system also includes a sensing circuit in parallel with the inductor. The sensing circuit includes a first RC circuit configured to detect an alternating current component of the voltage output and a second RC circuit configured to detect a direct current component of the voltage output.
Claims13
A switched inductor system, comprising:
- a switching regulator configured to receive an input signal and provide a voltage output, the switching regulator having at least one switch and at least one inductor;
- and
- a sensing circuit in parallel with the inductor, the sensing circuit including a first RC circuit configured to detect an alternating current component of the voltage output and a second RC circuit configured to detect a direct current component of the voltage output.
An electrosurgical generator, comprising:
- a controller configured to control a voltage output of the electrosurgical generator;
- and
- a radio frequency output stage configure to output energy, the radio frequency output stage comprising:
- a switching regulator configured to receive an input signal from the controller and provide a voltage output, the switching regulator having at least one switch and at least one inductor;
- and
- a sensing circuit in parallel with the inductor, the sensing circuit including a first RC circuit configured to detect an alternating current component of the voltage output and a second RC circuit configured to detect a direct current component of the voltage output;
- wherein the sensing circuit provides the alternating current component and the direct current component of the voltage output to the controller;
- and
- wherein the controller controls the output of the electrosurgical generator based on the alternating current component and the direct current component of the voltage output.
A lossless current sense circuit for detecting a voltage across an inductor, the circuit comprising:
- a first RC circuit configured to detect an alternating current component of the voltage across the inductor;
- and
- a second RC circuit configured to detect a direct current component of the voltage across the inductor.
Dependencies are inferred from the claim text.