Sense current measurement in switch mode power converters
AssigneeNXP B.V.
InventorHenricus Cornelis Johannes Buthker
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Abstract
A switch mode power converter configured for operation with a plurality of outputs is disclosed. The switch mode power converter includes an inductive element and a resistance in series with the inductive element. The resistance is series with the inductive element is used for determining a current through the inductive element. The resistance is a resistance between the main terminals of a switch in an on-state. The switch have two main terminals and a control terminal and being arranged for directing current through the inductive element to a one of the plurality of outputs.
Claims5
A switch mode power converter configured for operation with a plurality of outputs and comprising:
- an inductive element;
- and
- a plurality of switches in series with the inductive element, the plurality of switches arranged for directing current through the inductive element to a one of the plurality of outputs, each switch of the plurality of switches having two main terminals and a control terminal;
- a plurality of amplifiers, at least one amplifier connected across the main terminals of each switch, for determining a current through the respective switch from the voltage across the main terminals of the respective switch.
A method of operating a switch mode power supply having an inductive element and a plurality of outputs, the method comprising
- directing current through the inductive element to one of the plurality of outputs by means of a plurality of switches, each switch having two main terminals and a control terminal;
- and
- determining a current through the inductive element by measuring a resistance in series with the inductive element,
- wherein the resistance is a resistance between the main terminals of one of the plurality of switches when the switch is in an on-state.
Dependencies are inferred from the claim text.